My Inquiry
My Account
Texas Instruments CD74ACT257M
- Part No.:
- CD74ACT257M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74ACT257M.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:763
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74ACT257M 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 at 4.5V–5.5V, delivers ±24mA output drive, exhibits 9.7ns typical propagation delay (VCC = 5V), 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 CD74ACT257M datasheet, CD74ACT257M pinout, CD74ACT257M application, or CD74ACT257M equivalent, key selection criteria include its ACT-series TTL-compatible input thresholds, high-speed 3-state bus interface capability, robust ESD immunity (>2kV), and SOIC-16 packaging suitable for space-constrained industrial control PCBs.
Technical Context
The CD74ACT257M implements four independent 2:1 multiplexers sharing a common active-low Output Enable (OE) and Select (S) control line. Each channel routes either I₀ or I₁ to Y based on S, with non-inverting output polarity. All outputs enter high-impedance state when OE is HIGH.
Its ACT process ensures TTL-compatible input voltage thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V at VCC = 4.5–5.5V), balanced propagation delays across channels, and compatibility with FAST™-speed logic while consuming significantly less power than bipolar equivalents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - Ensures interoperability with standard 5V TTL/CMOS systems and stable operation across industrial supply tolerances. |
| Propagation Delay (I→Y) | 9.7ns typ @ VCC=5V - Enables reliable timing in high-speed data path switching up to ~100MHz system clock domains. |
| Output Drive | ±24mA - Supports fanout to 15 FAST™ ICs or direct driving of 50Ω transmission lines without external buffers. |
| Input Thresholds | VIH ≥ 2.0V, VIL ≤ 0.8V - Guarantees clean recognition of TTL-level signals, eliminating level-shifting requirements in mixed-logic designs. |
| ESD Protection | >2kV HBM - Meets MIL-STD-883 Method 3015, reducing field failure risk in handling and assembly environments. |
| Operating Temperature | –55°C to +125°C - Qualified for extended-range industrial, automotive under-hood, and military-grade applications. |
| Three-State Leakage | ±5μA max @ –55°C to +125°C - Minimizes bus contention current and signal integrity degradation during output disable. |
Pinout & Package
CD74ACT257M is supplied in a 16-pin SOIC (D) package measuring 9.9mm × 6mm (body: 9.9mm × 3.9mm), optimized for automated assembly and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Select (S), Output Enable (OE) | Shared control inputs: S selects between I₀/I₁ per channel; OE (active LOW) enables/disables all Y outputs simultaneously. |
| 2, 3, 5, 6, 10, 11, 13, 14 | Data Inputs (1I₀, 1I₁, 2I₀, 2I₁, 3I₀, 3I₁, 4I₀, 4I₁) | Eight dedicated inputs - two per multiplexer channel - accepting standard CMOS/TTL logic levels. |
| 4, 7, 9, 12 | Outputs (1Y, 2Y, 3Y, 4Y) | Four buffered, non-inverting, three-state outputs - each independently driven and high-impedance when OE = HIGH. |
| 8, 16 | GND, VCC | Power pins decoupled via 0.1μF ceramic capacitor per device to suppress switching noise and ensure stable logic thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting multiplexer architecture | Preserves logic polarity across all four channels - critical for transparent data routing without inversion compensation in control paths. |
| Buffered inputs | Reduces capacitive loading on upstream drivers and prevents signal degradation in fanout-heavy configurations. |
| SCR-latchup-resistant process | Eliminates risk of destructive latch-up during transient overvoltage or hot-swap events in powered systems. |
| 1.5V–5.5V AC/ACT family compatibility | Enables mixed-voltage board design: CD74ACT257M interfaces directly with AC-series devices operating down to 1.5V logic rails. |
| Drives 50Ω transmission lines | Supports point-to-point high-speed interconnects (e.g., backplane stubs or FPGA-to-ASIC links) without external line drivers. |
Applications
| Register File Multiplexing | Bus Arbitration Interface |
|---|---|
Use Scenario: Selecting data from dual-register banks (e.g., A/B register sets) into a shared ALU input bus in microcontroller datapaths. IC Role / Device Role / Timing Role: Quad 2:1 mux acting as synchronous data selector; S and OE synchronized to clock edge for glitch-free bus handoff. Use Value: Enables compact, low-latency register-to-ALU routing with 9.7ns propagation delay and no added setup/hold overhead beyond standard logic timing. | Use Scenario: Isolating multiple peripheral controllers onto a single shared memory-mapped bus in industrial PLC backplanes. IC Role / Device Role / Timing Role: Three-state bus gate - OE controlled by arbitration logic to enable only one master's data path at a time. Use Value: Prevents bus contention with ±24mA drive strength and <5μA off-state leakage, ensuring signal integrity across long traces. |
| Function Generator Logic | Digital Test Pattern Routing |
Use Scenario: Implementing custom combinational logic (e.g., parity generators, address decoders) using multiplexer-based LUT structures in legacy ASIC prototyping. IC Role / Device Role / Timing Role: Configurable logic block - inputs wired to constants or control bits, outputs combined via external gates. Use Value: Delivers deterministic 9.7ns delay and rail-to-rail CMOS output swing, enabling predictable timing closure in glue-logic implementations. | Use Scenario: Switching between multiple test signal sources (clock, pattern generator, fault injector) into a DUT's stimulus port during ATE functional testing. IC Role / Device Role / Timing Role: Signal path selector - S selects source, OE enables/disables stimulus delivery under test controller command. Use Value: High ESD immunity (>2kV) protects against handler-induced discharge; SOIC-16 footprint simplifies socket-based fixture integration. |
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 |
|---|---|---|---|
| CD74ACT257M96 | Tape-and-reel variant of identical SOIC-16 device; same electrical specs, pinout, and thermal profile. | Optimized for automated SMT production; requires reel-handling equipment but eliminates tube-to-feeder transfer. | Select CD74ACT257M96 for high-volume manufacturing; CD74ACT257M is obsolete and not recommended for new designs. |
| SN74ACT257N | Same functionality and AC/ACT specs, but in PDIP-16 package (19.3mm × 9.4mm); higher thermal resistance (RθJA = 119.9°C/W vs. SOIC's 119.9°C/W). | Suitable for prototyping, breadboarding, or through-hole legacy systems where SOIC reflow is unavailable. | Choose SN74ACT257N only for manual assembly or legacy board compatibility; SOIC remains preferred for density and thermal performance. |
Compared with CD74ACT257M96 and SN74ACT257N, the CD74ACT257M shares identical logic behavior and timing but lacks current production support; CD74ACT257M96 offers identical performance with modern packaging logistics, while SN74ACT257N trades board area for through-hole flexibility at the cost of higher thermal impedance.
Availability
CD74ACT257M is available at Aetrix Electronics and suitable for industrial control systems, aerospace avionics interfaces, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT257M 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 CD74ACT257M belongs to TI's Advanced CMOS Logic (ACT) series, engineered for TTL-compatible speed and drive strength in industrial and military applications where robustness and wide temperature operation are mandatory.
FAQ
What is the operating voltage range for CD74ACT257M?
The CD74ACT257M operates within a strict 4.5V to 5.5V supply range, as defined in its Recommended Operating Conditions. This range ensures TTL-compatible input thresholds and guaranteed 9.7ns propagation delay performance. Operation outside this window may result in undefined logic states or timing violations. The CD74ACT257M does not support lower voltages like 3.3V or 1.8V - those require AC-series variants such as CD74AC257M.
Is CD74ACT257M pin-compatible with CD74AC257M?
Yes, CD74ACT257M is pin-compatible with CD74AC257M - both use identical SOIC-16 packaging and share the same pin configuration, including Select (S), Output Enable (OE), eight data inputs, and four outputs. However, CD74ACT257M uses ACT-series input thresholds (VIH ≥ 2.0V) versus AC-series (VIH ≥ 1.2V at 3V), so direct substitution requires verifying upstream driver compatibility.
What is the maximum output sink/source current per pin for CD74ACT257M?
The CD74ACT257M provides ±24mA output drive per Y pin under recommended operating conditions (VCC = 4.5–5.5V, TA = –55°C to +125°C). This rating allows direct interfacing with FAST™ logic loads or 50Ω transmission lines. Exceeding ±24mA risks violating absolute maximum ratings and may cause permanent damage to the CD74ACT257M output stage.
Does CD74ACT257M support hot-swap or live-insertion?
No, CD74ACT257M is not rated for hot-swap operation. Its absolute maximum ratings assume VCC is stable before applying inputs. Applying signals while VCC is ramping or absent may forward-bias internal protection diodes, causing excessive current flow. For hot-swap applications, additional circuitry (e.g., power sequencing controllers) is required to ensure CD74ACT257M powers up before inputs are asserted.
What is the thermal resistance (RθJA) of CD74ACT257M in SOIC-16 package?
The junction-to-ambient thermal resistance (RθJA) for CD74ACT257M in the SOIC-16 (D) package is 119.9°C/W, measured on a standard evaluation PCB in free air. This value assumes proper PCB copper pour and 0.1μF decoupling per power pin. Higher ambient temperatures or poor layout can degrade thermal performance, potentially limiting sustained output current in the CD74ACT257M.
CD74ACT257M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 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
CD74ACT257M FAQ
1.How can I place an order for CD74ACT257M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT257M 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 CD74ACT257M reliable?
The price and inventory of CD74ACT257M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT257M is usually 5 days.
3.What payment methods are accepted for CD74ACT257M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT257M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT257M?
CD74ACT257M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT257M 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 CD74ACT257M?
For technical support, including CD74ACT257M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT257M requirements.
6.How does Aetrix verify that CD74ACT257M is sourced from the original manufacturer or authorized distributors?
All CD74ACT257M 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 CD74ACT257M meets industry standards.
7.What is the process for return or replacement of CD74ACT257M?
All CD74ACT257M units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT257M, 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 CD74ACT257M part is unused and in its original packaging.
Return procedure for CD74ACT257M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74ACT257M Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
