My Inquiry
My Account
Texas Instruments CD74ACT257EG4
- Part No.:
- CD74ACT257EG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74ACT257EG4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,905
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74ACT257EG4 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 (VCC = 5V, TA = 25°C, CL = 50pF), and supports industrial temperature range (–55°C to +125°C). It is used in register-to-bus data selection and function generation circuits.
For engineers reviewing the CD74ACT257EG4 datasheet, CD74ACT257EG4 pinout, CD74ACT257EG4 application, or CD74ACT257EG4 equivalent, key selection criteria include its ACT-series TTL-compatible input thresholds, three-state enable control (active-low OE), balanced propagation delays across channels, and compatibility with 50Ω transmission-line driving requirements.
Technical Context
The CD74ACT257EG4 implements four independent 2:1 multiplexers sharing a common select (S) and active-low output enable (OE) control. Each channel routes either I₀ or I₁ to Y based on S, with all outputs entering high-impedance state when OE is HIGH.
It uses Advanced CMOS Logic with SCR-latchup-resistant process, supports 5V-only operation (4.5V–5.5V), and features buffered inputs, 10pF input capacitance, and 15pF three-state output capacitance - enabling clean signal switching in noise-sensitive logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible) |
| Supply Voltage Range | 4.5V–5.5V - ensures interoperability with 5V TTL and LVTTL systems |
| Propagation Delay (I→Y) | 9.7ns typ @ 5V - enables ≤100MHz data routing in synchronous logic |
| Output Drive Current | ±24mA - drives 15 FAST™ ICs or directly terminates 50Ω transmission lines |
| Operating Temperature | –55°C to +125°C - qualified for military and harsh-environment industrial use |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - matches standard TTL logic levels for seamless interfacing |
| Three-State Leakage | ±5μA max @ –55°C to +125°C - ensures low standby current in bus-hold configurations |
Pinout & Package
CD74ACT257EG4 is supplied in PDIP-16 (N package), with 19.3mm × 9.4mm body size and through-hole mounting. Pin 1 is located at top-left corner adjacent to notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 10, 11, 13, 14 | Input (I₀/I₁/S) | CMOS-buffered data and select inputs; require defined logic levels - floating pins cause undefined outputs |
| 4, 7, 9, 12 | Output (Y) | Non-inverting three-state outputs; high-impedance when OE = HIGH |
| 8 | GND | Ground reference for all internal circuitry and output termination |
| 15 | OE | Active-low output enable - asserts all Y outputs simultaneously into high-Z state |
| 16 | VCC | Positive supply (4.5V–5.5V); requires local 0.1μF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting multiplexing | Preserves signal polarity across all four channels - eliminates need for external inverters in level-sensitive routing |
| Three-state outputs with common OE | Enables shared-bus architectures without external bus transceivers or arbitration logic |
| ±24mA output drive | Directly drives 50Ω PCB traces or fanouts to 15 FAST™ loads - reduces board-level buffering |
| SCR-latchup-resistant process | Guarantees immunity to latchup under transient overvoltage or ESD events in industrial environments |
| 2kV HBM ESD rating | Meets MIL-STD-883 Method 3015 - supports handling in non-ESD-controlled assembly areas |
Applications
| Industrial Data Acquisition System | Digital Test Equipment Multiplexer |
|---|---|
Use Scenario: Routing analog-to-digital converter (ADC) channel outputs to a single processor bus under microcontroller control. IC Role / Device Role / Timing Role: Quad 2:1 selector synchronizing four parallel sensor data streams onto one shared data path. Use Value: Eliminates discrete gate-based mux designs; leverages guaranteed 125°C operation for embedded sensor nodes in motor control cabinets. |
Use Scenario: Switching between multiple DUT (device-under-test) signal sources during automated functional testing. IC Role / Device Role / Timing Role: High-speed signal path selector enabling test pattern generator to address up to four DUTs via shared interface lines. Use Value: 9.7ns propagation delay ensures timing-critical test vectors meet setup/hold margins; three-state outputs prevent bus contention during reconfiguration. |
| Avionics Signal Conditioning Unit | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: Selecting between primary and backup sensor inputs in flight-critical monitoring subsystems. IC Role / Device Role / Timing Role: Redundant data path selector with fail-safe OE control disabling all outputs during fault conditions. Use Value: –55°C to +125°C qualification and SCR-latchup resistance support DO-254-compliant hardware design for airborne applications. |
Use Scenario: Consolidating discrete field input signals (e.g., limit switches, proximity sensors) onto a common backplane bus. IC Role / Device Role / Timing Role: Input signal aggregator enabling modular I/O expansion without increasing controller pin count. Use Value: ±24mA drive capability allows direct connection to 24V industrial sensors; PDIP package supports through-hole reliability in vibration-prone enclosures. |
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 | SOIC-16 package; same electrical specs, lower thermal resistance (RθJA = 119.9°C/W vs. 139.5°C/W for PDIP) | Suitable for surface-mount production; not pin-compatible with through-hole CD74ACT257EG4 due to different footprint | Select for automated assembly or space-constrained PCBs where reflow compatibility is required. |
| SN74ACT257N | Same PDIP-16 package and pinout; identical AC/DC specs per TI datasheet SCHS248C | Drop-in replacement with identical thermal and timing behavior; manufactured by TI under alternate part numbering | Preferred for second-source procurement where identical form, fit, and function are mandatory. |
Compared with CD74ACT257M96 and SN74ACT257N, the CD74ACT257EG4 offers identical logic functionality and electrical performance but differs in packaging (PDIP with Pb-free NiPdAu finish) and RoHS compliance status - making it suitable for legacy through-hole designs requiring full traceability and extended temperature validation.
Availability
CD74ACT257EG4 is available at Aetrix Electronics and suitable for industrial control systems, avionics signal conditioning units, and automated test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74ACT257EG4 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 over 90 years of innovation in high-reliability components.
The CD74ACT257EG4 belongs to TI's Advanced CMOS Logic family, engineered for robust 5V digital interfacing in mission-critical industrial, defense, and aerospace systems where latchup immunity and wide temperature operation are essential.
FAQ
What is the maximum operating frequency supported by CD74ACT257EG4?
The CD74ACT257EG4 does not specify a maximum clock frequency in its datasheet. Its usable switching rate is determined by propagation delay (9.7ns typical I→Y at 5V) and system-level timing margins. For reliable operation, designers should ensure setup/hold times and signal integrity allow for data valid windows exceeding 10–15ns - supporting effective routing rates up to ~60–80MHz in well-designed PCB layouts with controlled impedance.
Does CD74ACT257EG4 support mixed-voltage interfacing, such as 3.3V logic inputs?
No, CD74ACT257EG4 is an ACT-series device requiring 4.5V–5.5V supply and has TTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V). While a 3.3V logic HIGH may exceed VIH margin in some cases, it is not guaranteed across temperature and voltage tolerances. For reliable 3.3V-to-5V interfacing, level-shifting circuitry or a 3.3V-compatible multiplexer like SN74LVC257A is recommended instead of relying on CD74ACT257EG4.
How is the thermal pad handled on CD74ACT257EG4?
The CD74ACT257EG4 is packaged in PDIP-16 (N), which has no thermal pad. Thermal management relies on copper pour connected to pin 8 (GND) and pin 16 (VCC) on the PCB, plus adequate board-level copper area. Unlike WQFN or TSSOP variants, the PDIP version dissipates heat primarily through leads and package body - RθJA is specified at 139.5°C/W for this package in free-air conditions.
Can CD74ACT257EG4 be used as a logic function generator?
Yes, the CD74ACT257EG4 can implement basic combinational logic functions including AND, OR, XOR, and NAND by wiring inputs and select lines appropriately - as documented in TI's application guidance. Its four independent 2:1 muxes allow simultaneous generation of multiple Boolean terms, making it useful in glue logic reduction for FPGA/CPLD companion circuits or legacy TTL system upgrades where discrete gates would otherwise be needed.
Is CD74ACT257EG4 pin-compatible with CD74AC257E?
Yes, CD74ACT257EG4 and CD74AC257E share identical PDIP-16 pinout, terminal functions, and mechanical dimensions. However, they differ electrically: CD74AC257E operates from 1.5V–5.5V and has AC-series input thresholds, while CD74ACT257EG4 is 4.5V–5.5V only with TTL-compatible thresholds. Substitution is possible only if the system's supply and input logic levels match the ACT variant's stricter requirements.
CD74ACT257EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74ACT257EG4 FAQ
1.How can I place an order for CD74ACT257EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT257EG4 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 CD74ACT257EG4 reliable?
The price and inventory of CD74ACT257EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT257EG4 is usually 5 days.
3.What payment methods are accepted for CD74ACT257EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT257EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT257EG4?
CD74ACT257EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT257EG4 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 CD74ACT257EG4?
For technical support, including CD74ACT257EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT257EG4 requirements.
6.How does Aetrix verify that CD74ACT257EG4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT257EG4 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 CD74ACT257EG4 meets industry standards.
7.What is the process for return or replacement of CD74ACT257EG4?
All CD74ACT257EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT257EG4, 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 CD74ACT257EG4 part is unused and in its original packaging.
Return procedure for CD74ACT257EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74ACT257EG4 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…
