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

Texas Instruments CD74AC257M

Name: CD74AC257M
Brand: Texas Instruments
SKU: CD74AC257M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74AC257M

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: CD74AC257M.pdf

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

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Product details

Overview

CD74AC257M from Texas Instruments is a quad 2-input non-inverting multiplexer with three-state outputs, designed for data routing in digital logic systems. It operates across 1.5V–5.5V supply, delivers ±24mA output drive, exhibits 8.5ns typical propagation delay at 5V/25°C, and supports -55°C to +125°C industrial temperature range - used in register-to-bus data selection and function generation circuits.

For engineers reviewing the CD74AC257M datasheet, CD74AC257M pinout, CD74AC257M application, or CD74AC257M equivalent, key selection criteria include its SOIC-16 package, 3-state output control via active-low OE, balanced AC-type propagation delays, ESD robustness (>2kV), and compatibility with FAST™ fanout requirements.

Technical Context

The CD74AC257M implements four independent 2:1 multiplexers sharing one common select (S) input and one active-low output enable (OE) signal. Each channel routes either I₀ or I₁ to Y based on S state, with outputs entering high-impedance when OE is HIGH.

It uses Advanced CMOS Logic technology with SCR-latchup resistance, buffered inputs, and balanced noise immunity at 30% of V_CC. Its 1.5V–5.5V operation enables mixed-voltage system interfacing while maintaining TTL-compatible thresholds at 3V and 5V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.5V to 5.5V - supports low-voltage logic and legacy 5V systems without level shifters
Propagation Delay (t_PLH/t_PHL)	8.5ns typical at V_CC = 5V, T_A = 25°C, C_L = 50pF - enables high-speed data routing in timing-critical paths
Output Drive Current	±24mA per output - drives 15 FAST™ ICs or 50Ω transmission lines directly
Operating Temperature	-55°C to +125°C - qualified for extended industrial and automotive under-hood environments
ESD Protection	>2kV per MIL-STD-883 Method 3015 - enhances reliability in handling and assembly
Input Capacitance	10pF - minimizes loading on upstream drivers and preserves signal integrity
Three-State Output Capacitance	15pF - reduces switching noise and bus contention during state transitions

Pinout & Package

CD74AC257M is supplied in a 16-pin SOIC (D) package measuring 9.9mm × 6mm (body: 9.9mm × 3.9mm), with standard JEDEC MS-012AC footprint and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 5, 6, 10, 11, 13, 14	Data Inputs (1I0, 1I1, 2I0, 2I1, 3I0, 3I1, 4I0, 4I1)	Eight independent data inputs grouped into four 2-input channels; each pair feeds one multiplexer
4, 7, 9, 12	Outputs (1Y, 2Y, 3Y, 4Y)	Non-inverting buffered outputs; enter high-Z when OE = HIGH
15	Output Enable (OE)	Active-low global enable controlling all four outputs simultaneously
16	V_CC	Positive supply rail - must be bypassed with 0.1μF capacitor near pin
8	GND	Ground reference - required for stable logic thresholds and noise immunity
1	Select (S)	Common control input determining which data input (I₀ or I₁) appears at each Y output

Key Features

Feature	Design Value
Non-inverting outputs	Preserves logic polarity across all four channels - simplifies downstream logic design and avoids inversion compensation
Buffered inputs	Reduces capacitive loading on upstream drivers and improves noise rejection at input nodes
Three-state outputs with common OE	Enables time-multiplexed bus sharing among multiple devices without external gating logic
1.5V–5.5V wide supply range	Permits direct interface between 1.8V, 2.5V, 3.3V, and 5V logic domains in mixed-signal systems
SCR-latchup-resistant process	Guarantees immunity to destructive latchup events under transient overvoltage or ESD stress

Applications

Register File Data Routing	Bus Arbitration Interface
Use Scenario: Selecting between two parallel register banks (e.g., A/B sets) to feed a shared ALU or data path. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing simultaneous 4-bit data selection under single S control and coordinated OE gating. Use Value: Eliminates need for four discrete 2:1 mux ICs or complex PLD logic, reducing board area and interconnect delay.	Use Scenario: Enabling one of multiple peripheral controllers onto a common address/data bus in microcontroller-based systems. IC Role / Device Role / Timing Role: Three-state output multiplexer acting as a hardware bus switch controlled by master arbitration signals. Use Value: Provides deterministic, glitch-free bus ownership handoff with sub-10ns propagation and no external pull-ups required.
Logic Function Generator	Test Pattern Selector
Use Scenario: Implementing custom combinational logic (e.g., parity, enable decoding) using fixed-input configurations. IC Role / Device Role / Timing Role: Configurable 4-bit-wide 2-input logic block where I₀/I₁ pins are hardwired to constants or signals, and S selects function mode. Use Value: Delivers deterministic logic behavior with nanosecond-level timing predictability versus software-based alternatives.	Use Scenario: Switching between production firmware test vectors and factory calibration sequences in embedded diagnostics. IC Role / Device Role / Timing Role: High-reliability data selector routing pre-stored test patterns from ROM or flash to DUT interface pins. Use Value: Ensures repeatable, low-jitter pattern delivery across temperature extremes due to AC-series process stability.

Bus Arbitration Interface

Use Scenario: Selecting between two parallel register banks (e.g., A/B sets) to feed a shared ALU or data path.

IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing simultaneous 4-bit data selection under single S control and coordinated OE gating.

Use Value: Eliminates need for four discrete 2:1 mux ICs or complex PLD logic, reducing board area and interconnect delay.

Use Scenario: Enabling one of multiple peripheral controllers onto a common address/data bus in microcontroller-based systems.

IC Role / Device Role / Timing Role: Three-state output multiplexer acting as a hardware bus switch controlled by master arbitration signals.

Use Value: Provides deterministic, glitch-free bus ownership handoff with sub-10ns propagation and no external pull-ups required.

Logic Function Generator

Test Pattern Selector

Use Scenario: Implementing custom combinational logic (e.g., parity, enable decoding) using fixed-input configurations.

IC Role / Device Role / Timing Role: Configurable 4-bit-wide 2-input logic block where I₀/I₁ pins are hardwired to constants or signals, and S selects function mode.

Use Value: Delivers deterministic logic behavior with nanosecond-level timing predictability versus software-based alternatives.

Use Scenario: Switching between production firmware test vectors and factory calibration sequences in embedded diagnostics.

IC Role / Device Role / Timing Role: High-reliability data selector routing pre-stored test patterns from ROM or flash to DUT interface pins.

Use Value: Ensures repeatable, low-jitter pattern delivery across temperature extremes due to AC-series process stability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CD74AC257M96	Same die, tape-and-reel packaging (2500 pcs/reel); identical electrical specs and SOIC-16 footprint	Optimized for automated SMT assembly; same thermal and timing performance as CD74AC257M	Select CD74AC257M96 for volume production; CD74AC257M is obsolete but may exist in legacy inventory
SN74AC257N	Same AC-family functionality, PDIP-16 package; wider body (19.3mm × 9.4mm), higher R_θJA (119.9°C/W vs. SOIC's 119.9°C/W - same value but different test condition)	Suitable for prototyping and through-hole boards; lacks RoHS-compliant finish and reflow compatibility of SOIC variant	Choose SN74AC257N only for breadboarding or legacy through-hole designs; not recommended for new surface-mount designs

Compared with CD74AC257M96 and SN74AC257N, the CD74AC257M offers identical core logic but reflects an obsolete SOIC ordering variant - design reuse requires verification of current availability and MSL-1 reflow compliance, whereas CD74AC257M96 provides guaranteed production support and tape-and-reel logistics.

Availability

CD74AC257M is available at Aetrix Electronics and suitable for industrial control interfaces, automotive sensor signal conditioning, and embedded test equipment requiring stable component supply across extended temperature ranges.

Supply support for CD74AC257M 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and logic solutions.

The CD74AC257M belongs to TI's legacy CD74AC high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing in harsh industrial and aerospace environments.

FAQ

What is the supply voltage range supported by the CD74AC257M?

The CD74AC257M supports a supply voltage range of 1.5V to 5.5V, enabling interoperability across 1.8V, 2.5V, 3.3V, and 5V logic families. This wide range allows the CD74AC257M to serve as a voltage-level agnostic data router in mixed-supply systems without external level-shifting circuitry, while maintaining specified timing and drive performance across the full range.

Does the CD74AC257M have inverting or non-inverting outputs?

The CD74AC257M features non-inverting outputs - a defining characteristic of the 'AC257 and 'ACT257 variants, as confirmed in the device family documentation. This means that when input I₀ is selected, the output Y replicates I₀ without polarity inversion; likewise for I₁. The CD74ACT258 variant is explicitly noted as having inverting outputs, distinguishing it from the CD74AC257M.

What is the maximum operating temperature for the CD74AC257M?

The CD74AC257M is rated for operation from -55°C to +125°C, meeting extended industrial temperature requirements. This specification is verified in the Recommended Operating Conditions table and applies to the SOIC (D) package variant. The rating ensures reliable performance in demanding environments such as motor control enclosures, under-hood automotive modules, and outdoor industrial automation equipment where thermal cycling and ambient extremes are present.

How does the Output Enable (OE) pin function on the CD74AC257M?

The OE pin on the CD74AC257M is an active-low control that places all four outputs (1Y–4Y) into high-impedance state when driven HIGH. When OE is LOW, outputs respond normally to the select (S) and input signals. This behavior is documented in the truth table and functional description, and enables bus-sharing applications where multiple CD74AC257M devices can coexist on a common data path without contention.

Is the CD74AC257M pin-compatible with other members of the CD74AC257 family?

Yes, the CD74AC257M shares identical pinout and functionality with all CD74AC257 variants in SOIC-16 (D) package, including CD74AC257M96 and CD74AC257E (PDIP). Pin compatibility is confirmed by the unified pin configuration diagram covering CD74AC257, CD74ACT257, and CD74ACT258 in the datasheet, and validated by consistent pin numbering and function mapping across all D-package variants of the CD74AC257M series.

CD74AC257M Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: 24mA, 24mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 1.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

CD74AC257M FAQ

1.How can I place an order for CD74AC257M through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74AC257M 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 CD74AC257M reliable?

The price and inventory of CD74AC257M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC257M is usually 5 days.

3.What payment methods are accepted for CD74AC257M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC257M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74AC257M?

CD74AC257M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74AC257M 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 CD74AC257M?

For technical support, including CD74AC257M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC257M requirements.

6.How does Aetrix verify that CD74AC257M is sourced from the original manufacturer or authorized distributors?

All CD74AC257M 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 CD74AC257M meets industry standards.

7.What is the process for return or replacement of CD74AC257M?

All CD74AC257M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC257M, 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 CD74AC257M part is unused and in its original packaging.

Return procedure for CD74AC257M:

1.Submit a request within 90 days.

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

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