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

Texas Instruments CD74ACT257M96

Name: CD74ACT257M96
Brand: Texas Instruments
SKU: CD74ACT257M96
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CD74ACT257M96

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: CD74ACT257M96.pdf

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

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Product details

Overview

CD74ACT257M96 from Texas Instruments is a quad 2-input non-inverting multiplexer with three-state outputs, designed for high-speed data routing in digital logic systems. It operates at 4.5V–5.5V, delivers ±24mA output drive, exhibits 9.7ns typical propagation delay (V_CC = 5V, T_A = 25°C), and supports industrial temperature range (–55°C to +125°C). It is commonly used in register-to-bus data selection and function generation circuits.

For engineers reviewing the CD74ACT257M96 datasheet, CD74ACT257M96 pinout, CD74ACT257M96 application, or CD74ACT257M96 equivalent, key selection considerations include its ACT-series TTL-compatible input thresholds, 16-pin SOIC (D) package, three-state enable control (active-low OE), balanced propagation delays across channels, and compatibility with 50Ω transmission-line driving.

Technical Context

The CD74ACT257M96 implements four independent 2:1 multiplexers sharing a common select (S) and active-low output enable (OE) signal. Each channel routes either I₀ or I₁ to its Y output based on S, with all outputs entering high-impedance state when OE is high. Its ACT process ensures TTL-level input compatibility and fast switching with low power relative to bipolar alternatives.

It features buffered inputs, SCR-latchup-resistant construction, and exceeds 2kV ESD protection per MIL-STD-883 Method 3015. The device supports worst-case propagation delays of ≤10.7ns (In→Y) and ≤14.6ns (OE→Y) over full temperature and voltage range, with 10pF input capacitance and 15pF three-state output capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	ACT (Advanced CMOS, TTL-compatible inputs)
Supply Voltage Range	4.5V–5.5V - ensures interoperability with 5V TTL/CMOS systems without level shifting
Propagation Delay (In→Y)	9.7ns typ @ 5V, 25°C - enables >100MHz data routing in synchronous logic
Output Drive	±24mA - supports fanout to 15 FAST™ ICs or direct 50Ω transmission-line termination
Operating Temperature	–55°C to +125°C - qualified for military, automotive, and industrial embedded environments
Input Thresholds	V_IL ≤ 0.8V, V_IH ≥ 2.0V @ V_CC = 4.5–5.5V - guarantees robust noise margin vs. TTL logic
Three-State Leakage	±5μA max @ –55°C to +125°C - minimizes bus contention current in high-density systems

Pinout & Package

CD74ACT257M96 is housed in a 16-pin SOIC (D) package (9.9mm × 6.0mm body, 1.27mm pitch), with standard JEDEC outline and RoHS-compliant NiPdAu lead finish. Thermal performance includes R_θJA = 119.9°C/W (free-air).

Pin/Terminal	Circuit Role	Design Meaning
1, 15	S, OE	Shared select (S) and active-low output enable (OE) - both control all four channels simultaneously
2, 3, 5, 6, 10, 11, 13, 14	1I0, 1I1, 2I0, 2I1, 3I1, 3I0, 4I1, 4I0	Eight data inputs - two per channel (I₀/I₁), arranged for compact PCB layout and signal pairing
4, 7, 9, 12	1Y, 2Y, 3Y, 4Y	Four non-inverting three-state outputs - high-impedance when OE = HIGH, enabling bus sharing
8, 16	GND, V_CC	Power pins placed diagonally for decoupling capacitor placement adjacent to each supply rail

Key Features

Feature	Design Value
Non-inverting outputs	Preserves signal polarity across all four channels - eliminates need for external inversion in data path
Buffered inputs	Reduces loading on upstream drivers and improves noise immunity across temperature extremes
SCR-latchup resistance	Guarantees immunity to latchup under transient overvoltage or ESD events in harsh environments
1.5ns input slew rate support	Validated for 10ns rise/fall times at 4.5–5.5V - ensures reliable operation with fast-edge FPGA/CPLD outputs
Three-state output control	Single OE pin disables all outputs simultaneously - simplifies bus arbitration logic and reduces gate count

Applications

Register File Data Routing	Bus Multiplexing in Industrial PLCs
Use Scenario: Selecting between two banks of 4-bit registers (e.g., accumulator vs. temporary storage) before writing to a shared ALU input bus. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing simultaneous 4-bit data selection with matched propagation delays across all bits. Use Value: Eliminates timing skew between data lines, enabling single-cycle register-to-ALU transfers without added pipeline stages.	Use Scenario: Arbitrating access to a shared 4-bit status bus among multiple sensor interface modules in a programmable logic controller. IC Role / Device Role / Timing Role: Three-state-enabled multiplexer allowing one module at a time to drive the bus while others remain high-Z. Use Value: Reduces component count versus discrete gates or microcontroller-based arbitration, lowering BOM cost and firmware complexity.
Digital Function Generation	Test Pattern Selection in ATE Systems
Use Scenario: Implementing custom combinational logic (e.g., parity generator, nibble-wise XOR) using fixed input constants and select control. IC Role / Device Role / Timing Role: Configurable logic block where I₀/I₁ pins are hardwired to V_CC/GND and S controls output state. Use Value: Replaces multiple SSI logic gates with one IC, reducing board area and interconnect in space-constrained test fixtures.	Use Scenario: Switching between pre-stored 4-bit test vectors (e.g., fault injection patterns, calibration codes) during automated circuit testing. IC Role / Device Role / Timing Role: High-speed, low-skew vector selector synchronized to tester clock edges via OE gating. Use Value: Achieves sub-10ns vector transition timing, meeting tight setup/hold requirements of high-speed DUT interfaces.

Bus Multiplexing in Industrial PLCs

Use Scenario: Selecting between two banks of 4-bit registers (e.g., accumulator vs. temporary storage) before writing to a shared ALU input bus.

IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing simultaneous 4-bit data selection with matched propagation delays across all bits.

Use Value: Eliminates timing skew between data lines, enabling single-cycle register-to-ALU transfers without added pipeline stages.

Use Scenario: Arbitrating access to a shared 4-bit status bus among multiple sensor interface modules in a programmable logic controller.

IC Role / Device Role / Timing Role: Three-state-enabled multiplexer allowing one module at a time to drive the bus while others remain high-Z.

Use Value: Reduces component count versus discrete gates or microcontroller-based arbitration, lowering BOM cost and firmware complexity.

Digital Function Generation

Test Pattern Selection in ATE Systems

Use Scenario: Implementing custom combinational logic (e.g., parity generator, nibble-wise XOR) using fixed input constants and select control.

IC Role / Device Role / Timing Role: Configurable logic block where I₀/I₁ pins are hardwired to V_CC/GND and S controls output state.

Use Value: Replaces multiple SSI logic gates with one IC, reducing board area and interconnect in space-constrained test fixtures.

Use Scenario: Switching between pre-stored 4-bit test vectors (e.g., fault injection patterns, calibration codes) during automated circuit testing.

IC Role / Device Role / Timing Role: High-speed, low-skew vector selector synchronized to tester clock edges via OE gating.

Use Value: Achieves sub-10ns vector transition timing, meeting tight setup/hold requirements of high-speed DUT interfaces.

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
CD74ACT257M	Same functionality and pinout, but obsolete status and no tape-and-reel packaging	Not suitable for new designs requiring long-term supply continuity or automated assembly	Select CD74ACT257M96 for production use due to active status and 2500-piece reel availability
SN74ACT257N	Identical electrical specs and pinout; differs only in PDIP (N) package (19.3mm × 9.4mm) vs. SOIC (D)	Preferred for through-hole prototyping or legacy board rework; unsuitable for surface-mount volume production	Choose SN74ACT257N only when manual assembly or socket-based validation is required

Compared with CD74ACT257M (obsolete) and SN74ACT257N (PDIP), CD74ACT257M96 provides guaranteed long-term availability in industry-standard SOIC tape-and-reel format, optimized for pick-and-place manufacturing and thermal performance (R_θJA = 119.9°C/W), while maintaining identical logic behavior and timing.

Availability

CD74ACT257M96 is available at Aetrix Electronics and suitable for industrial control systems, aerospace data acquisition units, and automotive engine control modules requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.

Supply support for CD74ACT257M96 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 specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.

The CD74ACT257M96 belongs to TI's CD74ACT high-speed CMOS logic series, engineered for drop-in replacement of bipolar TTL in demanding applications where low power, high noise immunity, and wide temperature operation are critical.

FAQ

What is the maximum operating frequency supported by CD74ACT257M96?

The CD74ACT257M96 does not specify a maximum clock frequency, but its worst-case propagation delay (In→Y) is 10.7ns at V_CC = 5V and T_A = 125°C. This supports reliable data routing up to approximately 45MHz in synchronous systems with conservative timing margins. For CD74ACT257M96, system-level frequency limits depend on board layout, load capacitance, and setup/hold timing of upstream/downstream devices.

Does CD74ACT257M96 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of CD74ACT257M96 must be tied to V_CC or GND per TI's layout guidelines. Floating inputs can cause undefined output states, increased power consumption, or oscillation. For CD74ACT257M96, unused select (S) or OE pins should be pulled to GND (OE) or V_CC (S) depending on desired default channel selection and output enable state.

Can CD74ACT257M96 drive a 50Ω transmission line directly?

Yes - CD74ACT257M96 is explicitly characterized for 50Ω transmission-line driving capability at 85°C (75Ω at 125°C), verified by test condition IO = ±75mA. Its ±24mA output drive and low output impedance allow clean signal integrity on controlled-impedance traces without external line drivers, making CD74ACT257M96 suitable for backplane or high-speed interconnect applications.

What is the meaning of "M96" in CD74ACT257M96?

The "M96" suffix in CD74ACT257M96 denotes the packaging configuration: M = SOIC (D) package, 96 = tape-and-reel packaging with 2500 units per reel. This distinguishes it from tube-packaged variants (e.g., CD74ACT257E) and obsolete versions (e.g., CD74ACT257M). CD74ACT257M96 is an active, RoHS-compliant, Level-1 moisture-sensitive part qualified for automated SMT assembly.

How does CD74ACT257M96 differ from CD74AC257M96?

CD74ACT257M96 uses ACT logic (TTL-compatible input thresholds: V_IH ≥ 2.0V, V_IL ≤ 0.8V), while CD74AC257M96 uses AC logic (wider supply range: 1.5V–5.5V; V_IH = 3.85V min at 5.5V). CD74ACT257M96 is optimized for 5V systems interfacing with legacy TTL, whereas CD74AC257M96 targets mixed-voltage or low-voltage operation. Both share identical pinout, package, and multiplexer functionality.

CD74ACT257M96 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: 75mA, 75mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

CD74ACT257M96 FAQ

1.How can I place an order for CD74ACT257M96 through Aetrix?

Please submit a Request for Quotation (RFQ) for CD74ACT257M96 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 CD74ACT257M96 reliable?

The price and inventory of CD74ACT257M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT257M96 is usually 5 days.

3.What payment methods are accepted for CD74ACT257M96?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT257M96 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CD74ACT257M96?

CD74ACT257M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CD74ACT257M96 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 CD74ACT257M96?

For technical support, including CD74ACT257M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT257M96 requirements.

6.How does Aetrix verify that CD74ACT257M96 is sourced from the original manufacturer or authorized distributors?

All CD74ACT257M96 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 CD74ACT257M96 meets industry standards.

7.What is the process for return or replacement of CD74ACT257M96?

All CD74ACT257M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT257M96, 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 CD74ACT257M96 part is unused and in its original packaging.

Return procedure for CD74ACT257M96:

1.Submit a request within 90 days.

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

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