Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Clock/Timing > Clock Generators, PLLs, Frequency Synthesizers

NXP Semiconductors MC145151DW2R2

Name: MC145151DW2R2
Brand: NXP Semiconductors
SKU: MC145151DW2R2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MC145151DW2R2

Manufacturer:: NXP Semiconductors

Category:: Clock Generators, PLLs, Frequency Synthesizers

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: MC145151DW2R2.pdf

Description:: IC PLL CLOCK/FREQ SYNTH 28SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,160

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MC145151DW2R2 from Freescale Semiconductor is a CMOS-based parallel-input PLL frequency synthesizer IC designed for low-power, programmable local oscillator generation in radio systems. It integrates a 14-bit ÷N counter, 8-value selectable ÷R divider (8–8192), linearized digital phase detector, on-chip reference oscillator interface, and lock detect output. It operates from 3.0 V to 9.0 V and supports up to 25 MHz input frequency with single-modulus prescaler architecture - used in UHF land mobile radios and scanning receivers.

For engineers reviewing the MC145151DW2R2 datasheet, MC145151DW2R2 pinout, MC145151DW2R2 application, or MC145151DW2R2 equivalent, key selection considerations include its 14-bit N-counter range (3–16383), R-divider address coding (RA0–RA2), transmit/receive offset adder (T/R), dual-phase detector outputs (φV/φR), and SOG package compatibility with Case 751F footprint.

Technical Context

The MC145151DW2R2 implements a single-modulus PLL architecture where the reference frequency (f_R) is derived from an external crystal via OSCin/OSCout and divided by one of eight user-selectable R-values (8–8192), while the feedback path (f_V) is derived from the VCO signal applied to fin and divided by a 14-bit programmable N-value (3–16383). Its "linearized" digital phase detector improves transfer function linearity over conventional XOR types.

It features three-state PDout (pin 4) and complementary double-ended φV/φR outputs (pins 8–9) for flexible loop filter interfacing, plus LD (pin 28) for lock status indication. The T/R input (pin 21) enables fixed +856 offset addition to the N value during transmit mode - critical for IF-offset tuning in transceivers operating with low-side injection.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.0 V to 9.0 V - supports wide-range battery or regulated rail operation without level-shifting.
÷N Counter Range	3 to 16383 (14-bit) - enables fine channel spacing (e.g., 1 kHz steps in 5–5.5 MHz LO) with high resolution.
÷R Selection	8 discrete values (8, 128, 256, 512, 1024, 2048, 2410, 8192) via RA0–RA2 - sets reference frequency division ratio for stability vs. step size trade-off.
Input Frequency (fin)	Up to 25 MHz (dc-coupled square wave, VDD = 9 V) - compatible with standard prescaler outputs (e.g., ÷64/65) in UHF/VHF bands.
Operating Temperature	−40 °C to +85 °C - qualified for industrial and land-mobile radio environments.
Phase Detector Type	Linearized digital - reduces nonlinearity-induced spurs and improves loop stability versus basic XOR detectors.
Package	SOG (Small Outline Gull-wing), Case 751F - surface-mount compatible with automated assembly and thermal performance suitable for RF subsystems.

Pinout & Package

SOG package (Case 751F), 28-pin gull-wing lead frame, 0.050" pitch, body dimensions 0.535" × 0.295". RoHS-compliant, plastic encapsulated.

Pin/Terminal	Circuit Role	Design Meaning
1 (fin)	VCO feedback input	AC- or DC-coupled input to ÷N counter; accepts up to 25 MHz square wave or 15 MHz sine at 500 mV_p-p.
3 (VDD), 2 (VSS)	Power supply rails	Support 3–9 V operation; internal CMOS logic and analog blocks share common ground and supply.
4 (PDout)	Three-state phase error output	Single-ended loop-error signal; high-impedance when locked, pulses positive/negative when f_V lags/leads f_R.
5–7 (RA0–RA2)	Reference divider address inputs	Binary code selects one of eight R-divide values (e.g., RA2=0, RA1=0, RA0=0 → ÷8); internal pull-ups default to logic 1.
8–9 (φV, φR)	Complementary phase detector outputs	Double-ended error signals for improved noise immunity; φV low when f_V leads, φR low when f_V lags.
10 (fV)	÷N counter buffered output	Provides access to internal ÷N clock - usable as system timing source independent of PLL loop.
11–20, 22–25 (N0–N13)	N-counter parallel data inputs	14-bit parallel load bus; N0 = LSB, N13 = MSB; internal pull-ups allow SPST switch programming.
21 (T/R)	Transmit/receive offset control	Logic low adds fixed +856 to N value - enables IF-offset tuning without software recalculations in duplex radios.
26 (OSCout), 27 (OSCin)	Crystal oscillator interface	Forms Pierce oscillator with external crystal; also accepts external CMOS-level reference signal at OSCin.
28 (LD)	Lock detect output	Active-high open-drain (with pull-up) signal indicating stable phase/frequency lock; pulses low during unlock.

Key Features

Feature	Design Value
Single-modulus parallel programming	14-bit N and 3-bit R inputs enable fast, deterministic frequency setup without serial overhead or state-machine delays.
Transmit/receive offset adder	T/R pin provides hardware-based +856 N-value offset - eliminates microcontroller intervention for duplex IF alignment.
Linearized digital phase detector	Reduces harmonic distortion in error voltage, lowering reference spurs and improving phase noise floor in closed-loop operation.
On-chip oscillator interface	Direct crystal connection (OSCin/OSCout) with optional external reference input - simplifies BOM and layout vs. discrete oscillator solutions.
Lock detect with active-high assertion	LD output remains high during lock and pulses low on loss-of-lock - enables real-time monitoring and automatic recovery sequencing.

Applications

UHF Land Mobile Radio	AM/FM Broadcast Tuning
Use Scenario: Synthesizing 440–470 MHz transmit and 418.6–448.6 MHz receive LOs with 25 kHz channel spacing in portable two-way radios. IC Role / Device Role / Timing Role: MC145151DW2R2 serves as the core frequency synthesis engine, generating precise LO signals synchronized to a 10.0417 MHz on-chip crystal reference. Use Value: Enables rapid channel switching and stable frequency accuracy (<±10 ppm) across temperature using its 8-value R-divider and 14-bit N-counter.	Use Scenario: Providing tunable local oscillator signals for AM (530–1710 kHz) and FM (87.5–108 MHz) broadcast receivers with 10 kHz/200 kHz step resolution. IC Role / Device Role / Timing Role: MC145151DW2R2 generates variable LO frequencies via parallel N-programming, interfaced with a dual-modulus prescaler for wideband coverage. Use Value: Delivers low-power, low-spur synthesis with lock detect feedback - critical for battery-operated portable radios requiring fast tuning and low standby current.
Scanning Receivers	Amateur Radio Transceivers
Use Scenario: Rapidly stepping through multiple frequency bands (e.g., VHF airband, marine, public safety) with sub-second channel acquisition time. IC Role / Device Role / Timing Role: MC145151DW2R2 acts as the programmable frequency source, driven by microcontroller GPIOs to update N and R values on-the-fly. Use Value: Parallel input architecture allows full 14-bit reload in one clock cycle - enabling faster scan rates than serial-programmed synthesizers.	Use Scenario: Supporting HF/VHF/UHF multi-band operation in homebrew or commercial amateur transceivers with manual or computer-controlled band selection. IC Role / Device Role / Timing Role: MC145151DW2R2 provides stable, low-phase-noise LO generation with T/R-controlled offset for transmit/receive duplexing. Use Value: Hardware T/R offset (+856) and dual-phase detector outputs simplify loop filter design and improve dynamic range in SSB/CW modes.

UHF Land Mobile Radio

AM/FM Broadcast Tuning

Use Scenario: Synthesizing 440–470 MHz transmit and 418.6–448.6 MHz receive LOs with 25 kHz channel spacing in portable two-way radios.

IC Role / Device Role / Timing Role: MC145151DW2R2 serves as the core frequency synthesis engine, generating precise LO signals synchronized to a 10.0417 MHz on-chip crystal reference.

Use Value: Enables rapid channel switching and stable frequency accuracy (<±10 ppm) across temperature using its 8-value R-divider and 14-bit N-counter.

Use Scenario: Providing tunable local oscillator signals for AM (530–1710 kHz) and FM (87.5–108 MHz) broadcast receivers with 10 kHz/200 kHz step resolution.

IC Role / Device Role / Timing Role: MC145151DW2R2 generates variable LO frequencies via parallel N-programming, interfaced with a dual-modulus prescaler for wideband coverage.

Use Value: Delivers low-power, low-spur synthesis with lock detect feedback - critical for battery-operated portable radios requiring fast tuning and low standby current.

Scanning Receivers

Amateur Radio Transceivers

Use Scenario: Rapidly stepping through multiple frequency bands (e.g., VHF airband, marine, public safety) with sub-second channel acquisition time.

IC Role / Device Role / Timing Role: MC145151DW2R2 acts as the programmable frequency source, driven by microcontroller GPIOs to update N and R values on-the-fly.

Use Value: Parallel input architecture allows full 14-bit reload in one clock cycle - enabling faster scan rates than serial-programmed synthesizers.

Use Scenario: Supporting HF/VHF/UHF multi-band operation in homebrew or commercial amateur transceivers with manual or computer-controlled band selection.

IC Role / Device Role / Timing Role: MC145151DW2R2 provides stable, low-phase-noise LO generation with T/R-controlled offset for transmit/receive duplexing.

Use Value: Hardware T/R offset (+856) and dual-phase detector outputs simplify loop filter design and improve dynamic range in SSB/CW modes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PLL frequency synthesizer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC145151P2	Same die, Plastic DIP package (Case 710), through-hole mounting, higher thermal resistance.	Preferred for prototyping, lab testing, or legacy through-hole PCBs; not suitable for high-density SMT production.	Select MC145151P2 only when manual assembly or socket-based evaluation is required; MC145151DW2R2 is optimal for volume SMT.
MC145152DW2	Dual-modulus architecture (10-bit N, 6-bit A counters), different pinout, no T/R offset, supports wider frequency coverage via prescaler ratio switching.	Required for narrow-channel-spacing applications (e.g., cellular 30 kHz steps) where single-modulus N-range is insufficient.	Choose MC145152DW2 when synthesizing >1 GHz VCO frequencies or needing finer resolution below 10 kHz step size; not drop-in compatible.

Compared with MC145151P2, MC145151DW2R2 offers superior thermal performance and board-space efficiency in SMT layouts; compared with MC145152DW2, it delivers simpler control logic and hardware offset capability at the cost of reduced maximum output frequency range.

Availability

MC145151DW2R2 is available at Aetrix Electronics and suitable for UHF land mobile radio, AM/FM broadcast tuning, and scanning receiver designs requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.

Supply support for MC145151DW2R2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in automotive, industrial, and communications semiconductors, known for high-reliability analog and mixed-signal ICs.

The MC145151DW2R2 belongs to Freescale's legacy CMOS PLL synthesizer family, engineered specifically for cost-sensitive, low-power radio frequency control in professional and consumer wireless equipment.

FAQ

What is the maximum input frequency supported by the MC145151DW2R2 on the fin pin?

The MC145151DW2R2 supports up to 25 MHz on the fin pin when driven by a dc-coupled CMOS square wave at VDD = 9 V. At VDD = 5 V, the guaranteed limit is 20 MHz for square wave input and 15 MHz for ac-coupled sine wave (1 V_p-p). These limits assume proper termination and noise margin - exceeding them risks metastability or missed counts in the ÷N counter.

How does the T/R pin affect frequency programming in the MC145151DW2R2?

The T/R pin on the MC145151DW2R2 controls a fixed +856 offset added to the programmed N value when pulled low - used to shift the VCO frequency by the IF amount during transmit mode. When T/R is high (or left open, due to internal pull-up), no offset is applied. This hardware feature eliminates software recalculations and ensures deterministic IF alignment in transceivers.

Can the MC145151DW2R2 operate with an external reference clock instead of a crystal?

Yes, the MC145151DW2R2 can accept an external CMOS-level reference clock applied to the OSCin pin, with OSCout left unconnected. The device supports ac-coupled sine waves (≥500 mV_p-p) or dc-coupled square waves (rail-to-rail) up to 15 MHz. This mode bypasses the internal Pierce oscillator and allows use of TCXOs or system clocks for enhanced stability or synchronization.

What are the key differences between MC145151DW2R2 and MC145152DW2?

The MC145151DW2R2 uses single-modulus architecture with a 14-bit N counter and 3-bit R selection, while the MC145152DW2 implements dual-modulus (÷A/÷(A+1)) with separate 10-bit N and 6-bit A counters. MC145151DW2R2 includes the T/R offset adder and linearized phase detector; MC145152DW2 adds MC output for prescaler control but lacks T/R. Pinouts and programming interfaces are incompatible.

Does the MC145151DW2R2 require external passive components for oscillator startup?

Yes - when using the on-chip crystal oscillator, the MC145151DW2R2 requires two external load capacitors: one from OSCin to ground and one from OSCout to ground. Values depend on crystal specifications (typically 15–33 pF for fundamental-mode 1–10 MHz crystals). No resistors or feedback components are needed - the internal inverter provides full Pierce configuration.

MC145151DW2R2 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: PLL Clock/Frequency Synthesizer

PLL:: Yes

Input:: Clock

Output:: CMOS

Number of Circuits:: 1

Ratio - Input:Output:: 1:1

Differential - Input:Output:: No/No

Frequency - Max:: 25MHz

Divider/Multiplier:: Yes/No

Voltage - Supply:: 3V ~ 9V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 28-SOIC

MC145151DW2R2 FAQ

1.How can I place an order for MC145151DW2R2 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC145151DW2R2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC145151DW2R2 reliable?

The price and inventory of MC145151DW2R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC145151DW2R2 is usually 5 days.

3.What payment methods are accepted for MC145151DW2R2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC145151DW2R2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC145151DW2R2?

MC145151DW2R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC145151DW2R2 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC145151DW2R2?

For technical support, including MC145151DW2R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC145151DW2R2 requirements.

6.How does Aetrix verify that MC145151DW2R2 is sourced from the original manufacturer or authorized distributors?

All MC145151DW2R2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC145151DW2R2 meets industry standards.

7.What is the process for return or replacement of MC145151DW2R2?

All MC145151DW2R2 units undergo pre-shipment inspection (PSI). If there is an issue with MC145151DW2R2, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC145151DW2R2 part is unused and in its original packaging.

Return procedure for MC145151DW2R2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…