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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

NXP Semiconductors N74F245DB,112

Name: N74F245DB,112
Brand: NXP Semiconductors
SKU: N74F245DB,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: N74F245DB,112

Manufacturer:: NXP Semiconductors

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: N74F245DB,112.pdf

Description:: IC TXRX NON-INVERT 5.5V 20SSOP

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Product details

Overview

N74F245DB,112 from Nexperia is an octal bidirectional 3-state transceiver IC used for level-shifting and bus isolation between two 8-bit data buses. It features non-inverting logic, 4.0 ns typical propagation delay, ±5 V supply operation, and B-port outputs capable of sinking 64 mA and sourcing 15 mA - enabling robust drive in industrial control backplanes and legacy TTL-compatible systems.

For engineers reviewing the N74F245DB,112 datasheet, N74F245DB,112 pinout, N74F245DB,112 application, or N74F245DB,112 equivalent, key selection criteria include direction control (T/R), output enable (OE) polarity, 3-state timing margins, and B-port current drive capability under 5 V ±10% supply conditions.

Technical Context

The N74F245DB,112 implements a dual-bus transceiver architecture with independent transmit/receive direction control via the T/R input and global 3-state enable via active-low OE. Its B-port outputs are rated for higher sink current (64 mA) than A-port outputs (24 mA), supporting asymmetric bus loading scenarios.

It operates strictly within the 74F logic family's electrical envelope: V_CC = 4.5–5.5 V, T_amb = 0–70 °C, and uses standard FAST TTL voltage thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V). Propagation delays are specified for both A→B and B→A paths with identical t_PLH/t_PHL max of 6.0 ns at full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74F FAST TTL - ensures compatibility with legacy 5 V TTL systems and predictable noise margins
Propagation Delay	4.0 ns typical (A↔B), 6.0 ns max - enables reliable operation in high-speed bus arbitration up to ~100 MHz clock domains
B-Port Output Drive	Sinks 64 mA / sources 15 mA - supports direct connection to multiple TTL loads without external buffers
Supply Voltage Range	4.5 V to 5.5 V - matches standard 5 V rail tolerances and avoids undervoltage lockout in industrial power supplies
Operating Temperature	0 °C to +70 °C - certified for commercial-grade embedded control and instrumentation applications
3-State Enable Time	2.0–8.0 ns (t_PZH/t_PZL) - guarantees fast bus release during dynamic bus sharing in multiprocessor systems
Input Loading	A/B ports: 3.5/1.0 FAST unit loads - defines fan-out capacity and capacitive loading impact on signal integrity

Pinout & Package

Package: SSOP20 (plastic shrink small outline package), 20 leads, body width 5.3 mm, pitch 0.65 mm - suitable for space-constrained PCB layouts with automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (T/R)	Transmit/Receive direction control	Low = B→A data flow; High = A→B data flow - determines bus data path polarity
2–9 (A0–A7)	A-port bidirectional I/O	Non-inverting data interface for one bus segment; 3-state when OE = High
10 (GND)	Ground reference	Primary return path for all internal logic and output currents
11 (V_CC)	Positive supply	+5 V power input; decoupling capacitor required near pin for AC noise suppression
12 (OE)	Output Enable (active Low)	Low = outputs enabled; High = all A/B ports enter high-impedance state - enables bus sharing
13–19,20 (B0–B7)	B-port bidirectional I/O	Non-inverting data interface for second bus segment; higher sink current than A-port

Key Features

Feature	Design Value
Octal bidirectional bus interface	Enables full 8-bit parallel data transfer between two independent buses with single-direction control per cycle
Asymmetric output drive (B-port)	B0–B7 sink 64 mA - allows direct driving of heavier loads (e.g., multiple TTL inputs or LED arrays) without buffering
Power-off high-impedance protection	Outputs automatically enter Hi-Z when V_CC is removed - prevents back-driving and bus contention during hot-swap or power sequencing
FAST TTL compatible thresholds	V_IL ≤ 0.8 V / V_IH ≥ 2.0 V - ensures interoperability with legacy 74LS, 74F, and 74AS logic families

Applications

Industrial Backplane Interface	Legacy System Bus Extension
Use Scenario: Isolating and extending parallel address/data buses between CPU and peripheral modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow direction and enabling/disabling under microcontroller control. Use Value: Prevents bus contention during module insertion/removal and supports 64 mA load drive for long traces with multiple TTL loads.	Use Scenario: Interfacing modern FPGA-based controllers with vintage 74F-based memory or I/O expansion cards. IC Role / Device Role / Timing Role: Level- and timing-compatible bridge between new and legacy 5 V TTL subsystems. Use Value: Matches 4.0 ns propagation delay and FAST TTL input thresholds, eliminating need for glue logic or level shifters.
Test Equipment Data Switching	Embedded Diagnostic Port Multiplexer
Use Scenario: Routing test signals between DUT and ATE channels in automated board-level testers. IC Role / Device Role / Timing Role: 3-state-controlled bidirectional switch enabling shared test bus access across multiple DUTs. Use Value: Fast 2.0 ns t_PZH ensures minimal switching overhead; Hi-Z on power loss protects ATE instrumentation.	Use Scenario: Sharing a single UART or JTAG debug port among multiple MCUs in a multi-core embedded system. IC Role / Device Role / Timing Role: Direction-controlled data path selector managed by host controller GPIOs. Use Value: Enables software-selectable routing without external MUX ICs; B-port drive supports longer trace runs to remote debug headers.

Industrial Backplane Interface

Legacy System Bus Extension

Use Scenario: Isolating and extending parallel address/data buses between CPU and peripheral modules in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow direction and enabling/disabling under microcontroller control.

Use Value: Prevents bus contention during module insertion/removal and supports 64 mA load drive for long traces with multiple TTL loads.

Use Scenario: Interfacing modern FPGA-based controllers with vintage 74F-based memory or I/O expansion cards.

IC Role / Device Role / Timing Role: Level- and timing-compatible bridge between new and legacy 5 V TTL subsystems.

Use Value: Matches 4.0 ns propagation delay and FAST TTL input thresholds, eliminating need for glue logic or level shifters.

Test Equipment Data Switching

Embedded Diagnostic Port Multiplexer

Use Scenario: Routing test signals between DUT and ATE channels in automated board-level testers.

IC Role / Device Role / Timing Role: 3-state-controlled bidirectional switch enabling shared test bus access across multiple DUTs.

Use Value: Fast 2.0 ns t_PZH ensures minimal switching overhead; Hi-Z on power loss protects ATE instrumentation.

Use Scenario: Sharing a single UART or JTAG debug port among multiple MCUs in a multi-core embedded system.

IC Role / Device Role / Timing Role: Direction-controlled data path selector managed by host controller GPIOs.

Use Value: Enables software-selectable routing without external MUX ICs; B-port drive supports longer trace runs to remote debug headers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74F245N	DIP20 package; identical electrical specs and pinout	Through-hole mounting only; no surface-mount option	Select for prototyping or legacy through-hole production where reflow compatibility is not required
74LCX245MTCX	Lower V_CC range (2.0–3.6 V); CMOS technology; 5 V tolerant inputs	Designed for mixed-voltage 3.3 V systems interfacing to 5 V peripherals	Select when operating from 3.3 V supply while maintaining 5 V bus compatibility and lower ICC

Compared with SN74F245N and 74LCX245MTCX, the N74F245DB,112 provides identical 74F logic performance in a space-saving SSOP20 package - making it optimal for volume surface-mount production where footprint and thermal profile matter, but 5 V-only operation is acceptable.

Availability

N74F245DB,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and test equipment data switching requiring stable component supply and long-term obsolescence management.

Supply support for N74F245DB,112 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

Nexperia is a global leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division and focused on automotive, industrial, computing, and consumer markets.

The 74F series - including N74F245DB,112 - was originally developed by Philips Semiconductors to deliver high-speed, robust TTL-compatible logic for demanding industrial control and instrumentation applications.

FAQ

What is the pin configuration of the N74F245DB,112?

The N74F245DB,112 uses a 20-pin SSOP package with standardized 74F245 pinout: Pins 2–9 are A0–A7, Pin 1 is T/R, Pin 12 is OE (active low), Pins 13–20 are B0–B7 (with B5 and B6 swapped versus linear numbering), Pin 10 is GND, and Pin 11 is V_CC. This matches SOT339-1 mechanical drawing and is fully compatible with other 74F245 variants.

Does the N74F245DB,112 support 3.3 V operation?

No, the N74F245DB,112 is specified only for 4.5–5.5 V operation per its recommended conditions. It is not 3.3 V compatible. Attempting to operate the N74F245DB,112 below 4.5 V may result in undefined logic states, increased propagation delay, or failure to meet output drive specifications.

What is the maximum sink current capability of the B-port outputs on the N74F245DB,112?

The B-port outputs (B0–B7) of the N74F245DB,112 are rated to sink up to 64 mA per pin under recommended operating conditions (V_CC = 4.5–5.5 V, T_amb = 0–70 °C). This value is confirmed in the DC Electrical Characteristics table and supports direct driving of multiple TTL loads or moderate-current indicators.

Is the N74F245DB,112 pin-compatible with the SN74F245N?

Yes, the N74F245DB,112 is functionally and pin-compatible with the SN74F245N. Both share identical logic behavior, pin functions, and signal timing. The only difference is package type: N74F245DB,112 uses SSOP20 (SOT339-1), while SN74F245N uses DIP20 (SOT146-1).

What happens to the outputs of the N74F245DB,112 when V_CC is removed?

When V_CC is removed, the outputs of the N74F245DB,112 automatically enter a high-impedance state - a documented feature designed to prevent back-driving and bus contention during power sequencing or hot-swap events. This behavior is explicitly stated in the original Philips product specification for the 74F245 family.

N74F245DB,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74F

Package/Case:: 20-SSOP (0.209", 5.30mm Width)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 3mA, 24mA; 15mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

N74F245DB,112 FAQ

1.How can I place an order for N74F245DB,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for N74F245DB,112 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 N74F245DB,112 reliable?

The price and inventory of N74F245DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F245DB,112 is usually 5 days.

3.What payment methods are accepted for N74F245DB,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F245DB,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for N74F245DB,112?

N74F245DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your N74F245DB,112 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 N74F245DB,112?

For technical support, including N74F245DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F245DB,112 requirements.

6.How does Aetrix verify that N74F245DB,112 is sourced from the original manufacturer or authorized distributors?

All N74F245DB,112 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 N74F245DB,112 meets industry standards.

7.What is the process for return or replacement of N74F245DB,112?

All N74F245DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with N74F245DB,112, 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 N74F245DB,112 part is unused and in its original packaging.

Return procedure for N74F245DB,112:

1.Submit a request within 90 days.

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

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