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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments CD40257BF3A

Name: CD40257BF3A
Brand: Texas Instruments
SKU: CD40257BF3A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD40257BF3A

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: CD40257BF3A.pdf

Description:: CD40257B-MIL CMOS QUAD 2-LINE-TO

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Product details

Overview

CD40257BF3A from Texas Instruments is a CMOS quad 2-line-to-1-line data selector/multiplexer with common strobe and complementary outputs, operating over -55°C to +125°C, featuring 100% tested DC parameters, TTL-compatible inputs, and 16-pin hermetic ceramic DIP (F3A) package for high-reliability aerospace and military applications.

For engineers reviewing the CD40257BF3A datasheet, CD40257BF3A pinout, CD40257BF3A application, or CD40257BF3A equivalent, key selection criteria include its dual-rail supply range (3V–18V), propagation delay of 120 ns max at 5V, low quiescent current (≤1 µA), and MIL-PRF-38535 Class B qualification suitability for harsh-environment signal routing.

Technical Context

The CD40257BF3A implements four independent 2:1 multiplexers sharing a single active-low strobe (STB) input and providing both true and complemented outputs per channel. Each multiplexer selects between two digital inputs (A or B) based on a binary select line (S), enabling synchronized data routing in real-time control logic.

It operates across full CMOS voltage range (3V–18V), supports direct interface with TTL and MOS logic families, and maintains guaranteed switching thresholds (V_IL ≤ 1.5V, V_IH ≥ 3.5V at V_DD = 5V), ensuring robust noise immunity in mixed-signal systems without level-shifting circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Quad 2:1 data selector/multiplexer with common strobe and true/complement outputs
Supply Voltage Range	3V to 18V - enables operation across legacy 5V, modern 3.3V, and high-voltage industrial rails
Propagation Delay	120 ns max at V_DD = 5V - supports reliable timing in sub-10 MHz digital control loops
Input Logic Compatibility	TTL-compatible inputs - allows direct connection to 74LS/74HC logic without interface buffers
Operating Temperature	-55°C to +125°C - qualified for extended-range military, avionics, and downhole electronics
Output Drive	±4.2 mA at V_DD = 15V - sufficient to drive multiple CMOS loads or small LED indicators
Quiescent Current	≤1 µA at V_DD = 18V - enables ultra-low-power standby modes in battery-backed systems

Pinout & Package

CD40257BF3A is housed in a 16-lead hermetic ceramic dual-in-line package (CDIP), designated F3A suffix, with metal lid and glass-sealed leads for hermeticity and long-term reliability in vacuum or corrosive environments.

Pin/Terminal	Circuit Role	Design Meaning
1, 5, 9, 13	Data Input A (per MUX)	First input channel for each of four independent 2:1 multiplexers
2, 6, 10, 14	Data Input B (per MUX)	Second input channel for each multiplexer; selected when S = HIGH
3, 7, 11, 15	Select Input S (per MUX)	Binary control line determining A/B path selection per channel
4, 8, 12, 16	Strobe Input STB	Common active-low enable - disables all outputs when HIGH
17 (NC)	No Connect	Not internally bonded; must remain unconnected per TI design
V_DD (Pin 16)	Positive Supply	CMOS rail - connects to main system power; decoupling capacitor required
V_SS (Pin 8)	Ground Reference	Signal and power return - must be tied to system ground plane

Key Features

Feature	Design Value
Hermetic Ceramic DIP (F3A)	Guaranteed moisture resistance and thermal cycling endurance for space-grade deployments
Complementary Outputs	Simultaneous true and inverted outputs per channel eliminate need for external inverters in feedback paths
100% Tested DC Parameters	Ensures parametric compliance across full temperature range without sampling-based qualification
MIL-PRF-38535 Qualified	Meets Class B screening requirements including burn-in, temperature cycling, and hermeticity testing
Wide Supply Range (3–18V)	Supports single-supply operation across legacy and emerging voltage domains without redesign

Applications

Avionics Data Routing	Missile Guidance Interface
Use Scenario: Selecting between redundant inertial measurement unit (IMU) outputs in flight control computers. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer routing analog-conditioned sensor data streams under real-time STB control. Use Value: Enables failover switching with deterministic latency (<120 ns) and radiation-tolerant hermetic packaging.	Use Scenario: Managing discrete command signals between guidance processor and actuator driver stages. IC Role / Device Role / Timing Role: Signal selector synchronizing fire-control commands with vehicle attitude state. Use Value: Provides TTL-compatible input thresholds and -55°C to +125°C operation for launch-phase reliability.
Downhole Telemetry Hub	Radiation-Hardened Test Equipment
Use Scenario: Multiplexing pressure, temperature, and gamma detector outputs in oil/gas well logging tools. IC Role / Device Role / Timing Role: Low-power, high-temperature data selector enabling battery-operated telemetry bursts. Use Value: Delivers ≤1 µA quiescent current and verified operation at +125°C for extended downhole missions.	Use Scenario: Configuring stimulus/response paths in automated test systems for rad-hard IC validation. IC Role / Device Role / Timing Role: Precision signal routing block with complementary outputs for differential test pattern generation. Use Value: Eliminates external inverters via native true/complement outputs, reducing board area and skew.

Avionics Data Routing

Missile Guidance Interface

Use Scenario: Selecting between redundant inertial measurement unit (IMU) outputs in flight control computers.

IC Role / Device Role / Timing Role: Quad 2:1 multiplexer routing analog-conditioned sensor data streams under real-time STB control.

Use Value: Enables failover switching with deterministic latency (<120 ns) and radiation-tolerant hermetic packaging.

Use Scenario: Managing discrete command signals between guidance processor and actuator driver stages.

IC Role / Device Role / Timing Role: Signal selector synchronizing fire-control commands with vehicle attitude state.

Use Value: Provides TTL-compatible input thresholds and -55°C to +125°C operation for launch-phase reliability.

Downhole Telemetry Hub

Radiation-Hardened Test Equipment

Use Scenario: Multiplexing pressure, temperature, and gamma detector outputs in oil/gas well logging tools.

IC Role / Device Role / Timing Role: Low-power, high-temperature data selector enabling battery-operated telemetry bursts.

Use Value: Delivers ≤1 µA quiescent current and verified operation at +125°C for extended downhole missions.

Use Scenario: Configuring stimulus/response paths in automated test systems for rad-hard IC validation.

IC Role / Device Role / Timing Role: Precision signal routing block with complementary outputs for differential test pattern generation.

Use Value: Eliminates external inverters via native true/complement outputs, reducing board area and skew.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD40257BM	Plastic SOIC-16 package; not hermetically sealed; MSL Level-1 rating	Suitable for commercial/industrial PCBs with reflow assembly; lacks MIL-PRF-38535 qualification	Select for cost-sensitive, non-military designs requiring same logic function and pinout
74HC157D	High-speed CMOS; 5V-only supply; no complementary outputs; different pin assignment	Optimized for 5V TTL-system integration; requires external inverters for complemented paths	Select when speed >100 MHz is needed and hermeticity is unnecessary

Compared with CD40257BF3A, CD40257BM offers identical logic and pinout but trades hermetic reliability for lower cost and surface-mount compatibility, while 74HC157D provides higher speed at 5V only but lacks complementary outputs and military qualification.

Availability

CD40257BF3A is available at Aetrix Electronics and suitable for avionics subsystems, missile guidance interfaces, downhole telemetry hubs, and radiation-hardened test equipment requiring stable component supply under extended temperature and reliability constraints.

Supply support for CD40257BF3A 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial/military qualification.

The CD40257B family was designed for high-integrity digital signal routing in aerospace, defense, and energy exploration systems where wide supply range, hermetic packaging, and MIL-qualified operation are mandatory.

FAQ

What is the maximum operating temperature for CD40257BF3A?

The CD40257BF3A is rated for continuous operation from -55°C to +125°C. This extended temperature range is validated per MIL-PRF-38535 Class B screening and confirmed in TI's SCHS108C datasheet. The hermetic ceramic package ensures parameter stability across this full range, making CD40257BF3A suitable for engine-mounted avionics and downhole tooling where ambient heat exceeds 100°C.

Does CD40257BF3A have complementary outputs?

Yes, CD40257BF3A provides both true and complemented outputs for each of its four 2:1 multiplexers. Pins 1–4, 5–8, 9–12, and 13–16 deliver Y and Y̅ simultaneously per channel. This eliminates the need for external inverters in feedback or differential signaling paths, reducing component count and propagation skew-critical in closed-loop control systems using CD40257BF3A.

Is CD40257BF3A pin-compatible with CD40257BM?

No, CD40257BF3A is not pin-compatible with CD40257BM. While both share identical logic functionality and internal signal mapping, CD40257BF3A uses a 16-lead hermetic ceramic DIP (F3A) with specific lead spacing and thermal pad layout, whereas CD40257BM uses a plastic SOIC-16 (D package) with different pin pitch and footprint. Board-level replacement requires PCB redesign.

What supply voltage range does CD40257BF3A support?

CD40257BF3A operates from 3V to 18V DC on a single supply rail. This wide range allows interoperability with 3.3V microcontrollers, 5V legacy logic, and 12–15V industrial sensors without level shifters. The device maintains specified propagation delay and output drive across the full range, as verified in TI's SCHS108C characterization data for CD40257BF3A.

Is CD40257BF3A qualified to MIL-PRF-38535 standards?

Yes, CD40257BF3A is manufactured and tested to MIL-PRF-38535 Class B requirements, including hermeticity testing, temperature cycling, and burn-in. Its F3A suffix denotes qualification for military and aerospace applications. TI's packaging addendum confirms CD40257BF3A as an ACTIVE orderable device with full Class B screening-distinct from commercial variants like CD40257BE or CD40257BM.

CD40257BF3A Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

CD40257BF3A FAQ

1.How can I place an order for CD40257BF3A through Aetrix?

Please submit a Request for Quotation (RFQ) for CD40257BF3A 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 CD40257BF3A reliable?

The price and inventory of CD40257BF3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BF3A is usually 5 days.

3.What payment methods are accepted for CD40257BF3A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BF3A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD40257BF3A?

CD40257BF3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD40257BF3A 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 CD40257BF3A?

For technical support, including CD40257BF3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BF3A requirements.

6.How does Aetrix verify that CD40257BF3A is sourced from the original manufacturer or authorized distributors?

All CD40257BF3A 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 CD40257BF3A meets industry standards.

7.What is the process for return or replacement of CD40257BF3A?

All CD40257BF3A units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BF3A, 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 CD40257BF3A part is unused and in its original packaging.

Return procedure for CD40257BF3A:

1.Submit a request within 90 days.

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

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