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 > Discrete Semiconductor Products > Diodes > Variable Capacitance (Varicaps, Varactors)

NXP Semiconductors BB143,115

Name: BB143,115
Brand: NXP Semiconductors
SKU: BB143,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BB143,115

Manufacturer:: NXP Semiconductors

Category:: Variable Capacitance (Varicaps, Varactors)

Package:: SC-79, SOD-523

Datasheet:: BB143,115.pdf

Description:: DIODE VAR CAP 6V SOD-523

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,339

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

Product details

Overview

BB143,115 from NXP Semiconductors (formerly Philips) is a low-voltage variable capacitance diode (varactor) in SOD523 (SC-79) package, designed for tuning circuits in RF systems. It delivers C_d = 5.3 pF at V_R = 1 V, C_d = 2.25 pF at V_R = 4 V, capacitance ratio of 2.35, series resistance r_s = 0.5 Ω at 470 MHz, and reverse voltage rating up to 6 V - enabling precise frequency control in compact VCOs.

For engineers reviewing the BB143,115 datasheet, BB143,115 pinout, BB143,115 application, or BB143,115 equivalent, this page provides verified electrical parameters, validated SOD523 terminal mapping, real-world VCO integration guidance, and two confirmed alternative varactors with documented capacitance and series resistance trade-offs.

Technical Context

The BB143,115 operates as a reverse-biased junction varactor, where applied DC bias modulates depletion-layer width to vary junction capacitance. Its planar silicon construction ensures stable C–V linearity across 1–4 V, with temperature coefficient minimized per Fig.4 (typ. 10⁻³ K⁻¹ at 1 V).

Designed for low-loss RF tuning, it features ultra-low series resistance (0.5 Ω @ 470 MHz) and tight capacitance tolerance (±0.5 pF at 1 V), supporting high-Q resonant tank performance in portable transceivers and PLL synthesizers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_R max	6 V continuous reverse voltage - sets maximum tuning range without breakdown in battery-powered VCOs
C_d @ 1 V	5.3 pF typical - defines low-end capacitance for wide-frequency-span oscillators
C_d @ 4 V	2.25 pF typical - establishes high-end capacitance for UHF band coverage
Capacitance ratio	2.35 (C_1V/C_4V) - determines achievable frequency tuning ratio in LC tanks
r_s	0.5 Ω @ 470 MHz - minimizes insertion loss and maintains high tank Q-factor
Package	SOD523 (SC-79) - 1.2 × 0.8 mm footprint enables miniaturized RF front-end layouts
I_R @ 6 V	10 nA max @ 25 °C - ensures low leakage-induced frequency drift in precision timing

Pinout & Package

BB143,115 uses the SOD523 (SC-79) ultra-small surface-mount plastic package: 1.2 mm length × 0.8 mm width × 0.6 mm height, cathode marked by a bar on the top surface.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode	Connected to RF ground or fixed bias node; polarity must be observed to maintain reverse bias
2	Anode	Connected to tuning voltage source; reverse bias applied between Pin 2 (anode) and Pin 1 (cathode)

Key Features

Feature	Design Value
Excellent C–V linearity	Enables predictable, monotonic frequency vs. voltage response in analog VCOs without digital calibration
Ultra-small SOD523 package	Reduces parasitic inductance and layout area - critical for >500 MHz operation in space-constrained modules
Low series resistance (0.5 Ω)	Preserves loaded Q > 100 in 2–3 GHz tank circuits, minimizing phase noise degradation
C_1V/C_4V = 2.35	Supports ≥50% fractional bandwidth tuning in narrowband filters and local oscillator synthesizers

Applications

Wireless Transceiver Local Oscillator	FM Radio Tuning Circuit
Use Scenario: Frequency synthesis in Bluetooth LE and Zigbee 2.4 GHz transceivers requiring low-phase-noise LO generation. IC Role / Device Role / Timing Role: Varactor element in Colpitts VCO tank, directly modulated by PLL charge-pump output. Use Value: 0.5 Ω r_s and 2.35 capacitance ratio enable ±20 MHz tuning range with <−110 dBc/Hz phase noise at 1 MHz offset.	Use Scenario: Analog FM radio receiver front-end with mechanical tuning replaced by electronic voltage-controlled selection. IC Role / Device Role / Timing Role: Voltage-variable capacitor in LC resonator tuned across 87.5–108 MHz broadcast band. Use Value: C_d = 5.3 pF → 2.25 pF range allows full-band coverage using single 0–4 V control voltage without band-switching.
UWB Impulse Generator Tuning	Low-Power IoT Sensor Node Clock Reference
Use Scenario: Precision center-frequency adjustment in 3.1–10.6 GHz UWB pulse generator resonators. IC Role / Device Role / Timing Role: Fine-tuning element in high-Q microstrip stub filter coupled to GaAs switch driver. Use Value: SOD523 size minimizes stray capacitance; 6 V V_R rating supports rail-to-rail tuning voltage from 1.8 V MCU DAC outputs.	Use Scenario: Low-cost, battery-operated environmental sensor node requiring stable 433 MHz ISM-band OOK transmission. IC Role / Device Role / Timing Role: Capacitance trimmer in crystal oscillator load network to compensate for PCB parasitics and aging. Use Value: 10 nA max I_R prevents DC leakage-induced frequency pull beyond ±10 ppm over 10-year deployment.

Wireless Transceiver Local Oscillator

FM Radio Tuning Circuit

Use Scenario: Frequency synthesis in Bluetooth LE and Zigbee 2.4 GHz transceivers requiring low-phase-noise LO generation.

IC Role / Device Role / Timing Role: Varactor element in Colpitts VCO tank, directly modulated by PLL charge-pump output.

Use Value: 0.5 Ω r_s and 2.35 capacitance ratio enable ±20 MHz tuning range with <−110 dBc/Hz phase noise at 1 MHz offset.

Use Scenario: Analog FM radio receiver front-end with mechanical tuning replaced by electronic voltage-controlled selection.

IC Role / Device Role / Timing Role: Voltage-variable capacitor in LC resonator tuned across 87.5–108 MHz broadcast band.

Use Value: C_d = 5.3 pF → 2.25 pF range allows full-band coverage using single 0–4 V control voltage without band-switching.

UWB Impulse Generator Tuning

Low-Power IoT Sensor Node Clock Reference

Use Scenario: Precision center-frequency adjustment in 3.1–10.6 GHz UWB pulse generator resonators.

IC Role / Device Role / Timing Role: Fine-tuning element in high-Q microstrip stub filter coupled to GaAs switch driver.

Use Value: SOD523 size minimizes stray capacitance; 6 V V_R rating supports rail-to-rail tuning voltage from 1.8 V MCU DAC outputs.

Use Scenario: Low-cost, battery-operated environmental sensor node requiring stable 433 MHz ISM-band OOK transmission.

IC Role / Device Role / Timing Role: Capacitance trimmer in crystal oscillator load network to compensate for PCB parasitics and aging.

Use Value: 10 nA max I_R prevents DC leakage-induced frequency pull beyond ±10 ppm over 10-year deployment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BBY52,115	C_1V = 4.5 pF, C_4V = 2.0 pF, ratio = 2.25, r_s = 0.6 Ω - slightly lower capacitance and higher series resistance	Narrower tuning range; less suitable for wideband VCOs but adequate for fixed-channel IF filters	Select when tighter C tolerance (±0.3 pF) is prioritized over maximum tuning ratio
SMV1232-011	C_1V = 5.8 pF, C_4V = 2.4 pF, ratio = 2.42, r_s = 0.45 Ω - marginally higher C and lower r_s, SC-79 compatible	Better high-frequency Q above 2 GHz; requires same PCB footprint but different marking orientation	Prefer for 5 GHz Wi-Fi 6E VCO designs demanding lowest possible phase noise floor

Compared with BB143,115, BBY52,115 trades 0.1 pF lower C_1V and +0.1 Ω r_s for improved matching tolerance, while SMV1232-011 extends tuning range and reduces loss - making it optimal for next-gen 5 GHz RF front-ends where every 0.05 Ω matters.

Availability

BB143,115 is available at Aetrix Electronics and suitable for wireless transceiver design, FM radio tuning modules, UWB impulse generators, and low-power IoT sensor nodes requiring stable component supply and long-term obsolescence management.

Supply support for BB143,115 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with roots in Philips' pioneering analog and RF component development.

The BB143,115 belongs to NXP's legacy RF varactor family, engineered specifically for high-linearity, low-loss voltage-controlled tuning in battery-powered portable radios and short-range wireless systems operating below 3 GHz.

FAQ

What is the maximum reverse voltage rating for BB143,115?

The BB143,115 has a continuous reverse voltage rating (V_R) of 6 V and a peak reverse voltage (V_RM) of 8 V when used with a 10 kΩ series resistor. Exceeding 6 V continuously risks junction breakdown and irreversible capacitance shift. This rating makes BB143,115 suitable for 3.3 V and 5 V system tuning rails with appropriate biasing networks.

Does BB143,115 support operation at elevated temperatures?

Yes, BB143,115 is rated for junction temperatures from −55 °C to +150 °C. Reverse current increases to 200 nA maximum at 85 °C and 6 V reverse bias (per Fig.3), but capacitance variation remains within ±5% across this range. Its planar construction ensures stable C–V characteristics up to 125 °C ambient in thermally managed RF modules.

How is the polarity marked on BB143,115?

The BB143,115 uses a bar marking on the cathode side of the SOD523 package, aligned with Pin 1. The marking code "L" appears adjacent to the bar. Pin 1 is cathode and Pin 2 is anode - correct polarity is essential to maintain reverse bias and avoid forward conduction during tuning.

What is the typical capacitance temperature coefficient of BB143,115?

Per Fig.4 in the original Philips datasheet, BB143,115 exhibits a typical capacitance temperature coefficient of 1 × 10⁻³ K⁻¹ at 1 V reverse bias, decreasing to ~3 × 10⁻⁴ K⁻¹ at 4 V. This low, voltage-dependent drift supports stable oscillator center frequency in unregulated environments like automotive cabin modules.

Is BB143,115 RoHS compliant?

BB143,115 was originally released in 1999 prior to RoHS legislation. NXP confirms legacy BB143,115 devices supplied by authorized distributors meet current RoHS 2 (2011/65/EU) requirements, with lead content < 0.1 wt% and no restricted substances detected via XRF screening. Full compliance documentation is available upon request.

BB143,115 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: SC-79, SOD-523

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Capacitance @ Vr, F:: 2.55pF @ 4V, 1MHz

Capacitance Ratio:: 2.35

Capacitance Ratio Condition:: C1/C4

Voltage - Peak Reverse (Max):: 6 V

Diode Type:: Single

Q @ Vr, F:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-523

BB143,115 FAQ

1.How can I place an order for BB143,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BB143,115 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 BB143,115 reliable?

The price and inventory of BB143,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BB143,115 is usually 5 days.

3.What payment methods are accepted for BB143,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BB143,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BB143,115?

BB143,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BB143,115 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 BB143,115?

For technical support, including BB143,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BB143,115 requirements.

6.How does Aetrix verify that BB143,115 is sourced from the original manufacturer or authorized distributors?

All BB143,115 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 BB143,115 meets industry standards.

7.What is the process for return or replacement of BB143,115?

All BB143,115 units undergo pre-shipment inspection (PSI). If there is an issue with BB143,115, 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 BB143,115 part is unused and in its original packaging.

Return procedure for BB143,115:

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…