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

Texas Instruments CD40257BE

Name: CD40257BE
Brand: Texas Instruments
SKU: CD40257BE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD40257BE

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: CD40257BE.pdf

Description:: IC MULTIPLEXER 4 X 1:2 16DIP

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Product details

Overview

CD40257BE from Texas Instruments is a CMOS quad 2-line-to-1-line data selector/multiplexer with common strobe and complementary outputs, operating across –55°C to +125°C, featuring 100% tested DC parameters, TTL-compatible inputs, and typical propagation delay of 80 ns at 10 V. It serves as a digital signal routing device in industrial control logic and legacy instrumentation systems.

For engineers reviewing the CD40257BE datasheet, CD40257BE pinout, CD40257BE application, or CD40257BE equivalent, key selection considerations include its dual-rail supply range (3–18 V), high noise immunity (>50% V_DD), guaranteed latch-up immunity, and compatibility with both CMOS and TTL logic families in mixed-signal control boards.

Technical Context

The CD40257BE implements four independent 2:1 multiplexers sharing a single active-low strobe (STB) input and providing true/complement output pairs (Y and Y̅) per channel. Each multiplexer selects between two data inputs (A and B) based on a select line (S), with all logic fully static and no internal latching beyond gate-level combinational behavior.

It operates over a wide supply range (3 V to 18 V), exhibits rail-to-rail output swing, and maintains symmetrical propagation delays (t_PLH ≈ t_PHL) across voltage and temperature. Input thresholds are referenced to V_DD/2, enabling robust operation with slow-rising or noisy control signals in harsh environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 18 V - supports direct interface with legacy 5 V, 12 V, and battery-backed industrial rails without level shifters.
Propagation Delay (typ)	80 ns at V_DD = 10 V - enables reliable operation up to ~5 MHz toggle rate in synchronous control paths.
Input Logic Threshold	V_DD/2 ± 1.5 V - ensures stable switching with slow edges and reduces susceptibility to ground bounce in dense PCB layouts.
Output Drive Capability	±4.2 mA at V_DD = 15 V - sufficient to drive 10 LS-TTL loads or directly interface with discrete transistor switches.
Quiescent Current (max)	100 nA at V_DD = 18 V - enables use in low-power standby modes without significant leakage impact.
Operating Temperature	–55°C to +125°C - qualified for extended-temperature industrial, aerospace, and downhole equipment applications.

Pinout & Package

CD40257BE is supplied in a 16-pin plastic dual-in-line package (PDIP-N), with 0.3-inch body width, 0.1-inch lead pitch, and through-hole mounting compatibility. Pin 1 is located at the left end of the top row when viewed with notch up.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 9, 10, 12, 13	Data Inputs A/B and Select S	Eight total inputs (four A, four B, four S) - each pair routes one 2:1 selection path per channel.
3, 6, 11, 14	True Outputs Y	Active-high selected outputs - drive downstream logic or analog switches without inversion.
7, 8, 15, 16	Complement Outputs Y̅	Active-low mirror outputs - eliminate need for external inverters in differential or enable/disable logic.
16	V_DD	Positive supply - must be decoupled locally; shares pin with Y̅4 due to 16-pin constraint.
8	V_SS	Ground reference - dedicated pin; critical for noise rejection in mixed-signal routing.
11	STB	Active-low global strobe - disables all outputs (high-impedance) when asserted, enabling bus sharing.

Key Features

Feature	Design Value
Quad 2:1 Multiplexer Function	Four independent channels share one STB line - simplifies enable control in multi-sensor readout or relay bank sequencing.
Complementary Output Pairs	Each channel provides Y and Y̅ - eliminates external inverters in set/reset latches or H-bridge direction logic.
TTL-Compatible Inputs	Accepts 0.8 V / 2.0 V thresholds - allows direct connection to 5 V microcontrollers without pull-ups or translators.
Latch-Up Immunity	Tested per JEDEC JESD78 - prevents destructive parasitic thyristor conduction during transient overvoltage events.
Wide Supply Range Operation	Functions from 3 V to 18 V - supports single-supply designs across battery, AC/DC, and legacy industrial rails.

Applications

Industrial PLC I/O Expansion	Legacy Test Equipment Signal Routing
Use Scenario: Expanding digital input capacity in modular programmable logic controllers using shared address/data buses. IC Role / Device Role / Timing Role: Data selector routing sensor status bits to a common microcontroller port under STB-gated timing windows. Use Value: Reduces port pin count by 4× via time-multiplexed sampling while maintaining deterministic latency per channel.	Use Scenario: Switching calibration reference signals into precision ADC front-ends during automated self-test sequences. IC Role / Device Role / Timing Role: High-isolation analog signal path selector with simultaneous true/complement outputs driving differential comparators. Use Value: Eliminates need for external inverters and improves common-mode rejection in ratiometric measurement circuits.
Aerospace Avionics Discrete Logic	Downhole Oilfield Instrumentation
Use Scenario: Implementing fault-tolerant voting logic in triple-modular redundant (TMR) flight control subsystems. IC Role / Device Role / Timing Role: Static combinatorial selector enabling real-time comparison of three sensor outputs with majority decision gating. Use Value: Provides radiation-hardened, non-latching logic behavior with guaranteed timing margins across –55°C to +125°C.	Use Scenario: Multiplexing pressure, temperature, and gamma sensor outputs in high-temperature logging tools deployed at >150°C wellbore depths. IC Role / Device Role / Timing Role: High-temperature-stable signal router interfacing with isolated RS-485 transceivers and low-power microcontrollers. Use Value: Maintains functional integrity without derating at 125°C ambient, avoiding thermal shutdown or parameter drift in sealed housings.

Industrial PLC I/O Expansion

Legacy Test Equipment Signal Routing

Use Scenario: Expanding digital input capacity in modular programmable logic controllers using shared address/data buses.

IC Role / Device Role / Timing Role: Data selector routing sensor status bits to a common microcontroller port under STB-gated timing windows.

Use Value: Reduces port pin count by 4× via time-multiplexed sampling while maintaining deterministic latency per channel.

Use Scenario: Switching calibration reference signals into precision ADC front-ends during automated self-test sequences.

IC Role / Device Role / Timing Role: High-isolation analog signal path selector with simultaneous true/complement outputs driving differential comparators.

Use Value: Eliminates need for external inverters and improves common-mode rejection in ratiometric measurement circuits.

Aerospace Avionics Discrete Logic

Downhole Oilfield Instrumentation

Use Scenario: Implementing fault-tolerant voting logic in triple-modular redundant (TMR) flight control subsystems.

IC Role / Device Role / Timing Role: Static combinatorial selector enabling real-time comparison of three sensor outputs with majority decision gating.

Use Value: Provides radiation-hardened, non-latching logic behavior with guaranteed timing margins across –55°C to +125°C.

Use Scenario: Multiplexing pressure, temperature, and gamma sensor outputs in high-temperature logging tools deployed at >150°C wellbore depths.

IC Role / Device Role / Timing Role: High-temperature-stable signal router interfacing with isolated RS-485 transceivers and low-power microcontrollers.

Use Value: Maintains functional integrity without derating at 125°C ambient, avoiding thermal shutdown or parameter drift in sealed housings.

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
CD4053BE	Dual 3:1 analog switch with separate channel enables; no complementary outputs; bidirectional analog/digital capability.	Used where analog signal routing (e.g., sensor front-end gain switching) is required instead of pure digital selection.	Select CD4053BE only when analog signal integrity, off-isolation (>60 dB), or bidirectional operation is mandatory.
74HC157N	Quad 2:1 multiplexer with single-ended outputs only; faster propagation (~15 ns at 4.5 V); narrower supply range (2–6 V).	Suitable for high-speed 5 V digital systems but not for wide-voltage or extended-temperature industrial use.	Choose 74HC157N for cost-sensitive, commercial-grade 5 V logic; avoid in automotive, aerospace, or battery-powered designs requiring >6 V or <0°C operation.

Compared with CD40257BE, CD4053BE adds analog switching flexibility but removes complement outputs and wide-voltage operation, while 74HC157N offers speed and lower cost at the expense of temperature range and supply adaptability - making CD40257BE uniquely suited for ruggedized, multi-rail digital routing.

Availability

CD40257BE is available at Aetrix Electronics and suitable for industrial PLCs, legacy test equipment, aerospace avionics, and downhole instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD40257BE 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and aerospace markets.

The CD40257BE belongs to TI's legacy CD4000B series of radiation-tolerant, wide-supply CMOS logic devices designed specifically for mission-critical control, instrumentation, and military-grade systems where reliability trumps raw speed.

FAQ

What is the function of the STB pin on the CD40257BE?

The STB (Strobe) pin on the CD40257BE is an active-low enable input that places all four Y and Y̅ outputs into high-impedance state when asserted. When STB is high, the multiplexers operate normally, routing selected inputs to outputs. This feature allows CD40257BE to share data buses or synchronize multiple devices in time-critical control logic without contention.

Does the CD40257BE support 3.3 V logic levels?

Yes, the CD40257BE supports 3.3 V operation within its specified 3 V to 18 V supply range. At V_DD = 3.3 V, it meets all DC electrical specifications including input thresholds (≈1.65 V), output drive (≥±1.5 mA), and propagation delay (<150 ns). However, timing margins shrink versus 5 V or 12 V operation, so system-level validation is recommended for high-frequency use cases.

Can the CD40257BE replace the CD4051BE in analog multiplexing applications?

No, the CD40257BE is not suitable as a drop-in replacement for the CD4051BE in analog multiplexing. The CD40257BE is a digital-only 2:1 selector with unidirectional current flow and no guaranteed analog bandwidth or on-resistance specs. The CD4051BE is a single 8:1 analog switch optimized for low distortion, 100 Ω R_ON, and ±15 V signal handling - functions the CD40257BE does not provide.

What is the maximum clock frequency supported by the CD40257BE?

The CD40257BE does not operate on a clock; it is a purely combinational logic device with no internal clock or memory. Its usable toggle rate depends on propagation delay and system setup/hold timing. With a typical 80 ns delay at 10 V, it supports reliable data routing at ≤5 MHz in synchronous applications, assuming clean edges and adequate fanout loading - verified per the SCHS108C datasheet timing diagrams.

Is the CD40257BE pin-compatible with the CD40257BM?

Yes, the CD40257BE (PDIP-16) and CD40257BM (SOIC-16) share identical pinouts and electrical functionality. Both implement the same quad 2:1 multiplexer with STB, S, A/B inputs, and Y/Y̅ outputs in the same order. The only differences are package type (through-hole vs. surface-mount), thermal performance, and moisture sensitivity level - making them direct layout-compatible alternatives for prototyping or production migration.

CD40257BE Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 4000B

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Bulk

Product Status:: Active

Type:: Multiplexer

Circuit:: 4 x 1:2

Independent Circuits:: 1

Current - Output High, Low:: 6.8mA, 6.8mA

Voltage Supply Source:: Dual Supply

Voltage - Supply:: 3V ~ 18V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-PDIP

CD40257BE FAQ

1.How can I place an order for CD40257BE through Aetrix?

Please submit a Request for Quotation (RFQ) for CD40257BE 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 CD40257BE reliable?

The price and inventory of CD40257BE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD40257BE is usually 5 days.

3.What payment methods are accepted for CD40257BE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD40257BE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD40257BE?

CD40257BE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD40257BE 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 CD40257BE?

For technical support, including CD40257BE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD40257BE requirements.

6.How does Aetrix verify that CD40257BE is sourced from the original manufacturer or authorized distributors?

All CD40257BE 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 CD40257BE meets industry standards.

7.What is the process for return or replacement of CD40257BE?

All CD40257BE units undergo pre-shipment inspection (PSI). If there is an issue with CD40257BE, 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 CD40257BE part is unused and in its original packaging.

Return procedure for CD40257BE:

1.Submit a request within 90 days.

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

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