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Texas Instruments CD74AC257E
- Part No.:
- CD74AC257E
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC257E.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:563
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Product details
Overview
CD74AC257E 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, and supports -55°C to +125°C industrial/military temperature range - used in register-to-bus data selection and function generation circuits.
For engineers reviewing the CD74AC257E datasheet, CD74AC257E pinout, CD74AC257E application, or CD74AC257E equivalent, key selection criteria include its 16-pin PDIP package, TTL/CMOS-compatible input thresholds, three-state enable control (active-low OE), balanced propagation delays, and ESD robustness exceeding 2kV per MIL-STD-883.
Technical Context
The CD74AC257E 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. Its Advanced CMOS process ensures SCR-latchup resistance and compatibility with both 3.3V and 5V logic families.
Propagation delay is tightly balanced between input-to-output (tPLH/tPHL) and select-to-output (tPLH/tPHL) paths, enabling synchronous data switching across channels. The device drives 50Ω transmission lines and supports fanout to 15 FAST™ ICs without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V logic domains without level shifters |
| Propagation Delay (5V, 25°C) | 8.5ns max (I→Y), 12.2ns max (S→Y) - supports >80MHz data switching in critical timing paths |
| Output Drive Current | ±24mA per output - sufficient to directly drive multiple TTL loads or terminate 50Ω lines |
| Input Thresholds (5V) | VIL ≤ 1.65V, VIH ≥ 3.85V - provides 1.35V noise margin against ground bounce and supply ripple |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial, automotive under-hood, and military applications |
| ESD Rating | >2kV HBM - exceeds MIL-STD-883 Method 3015, reducing susceptibility to handling damage |
| Three-State Leakage | ±5μA max (at 125°C) - ensures minimal bus contention current during high-impedance state |
Pinout & Package
CD74AC257E uses a 16-pin plastic dual in-line package (PDIP-N), body size 19.3mm × 6.35mm, with through-hole mounting and industry-standard pin spacing (0.1" row pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Select (S), Output Enable (OE) | Common control inputs: S chooses I₀/I₁ source per channel; OE (active-low) disables all outputs to high-Z |
| 2, 3, 5, 6, 10, 11, 13, 14 | Data Inputs (1I₀, 1I₁, 2I₀, 2I₁, 3I₀, 3I₁, 4I₀, 4I₁) | Eight buffered inputs - two per multiplexer channel, accepting standard CMOS/TTL logic levels |
| 4, 7, 9, 12 | Outputs (1Y, 2Y, 3Y, 4Y) | Four non-inverting three-state outputs - each independently controllable via shared S and OE |
| 8 | GND | Ground reference for all internal circuitry and output drivers |
| 16 | VCC | Positive supply rail - bypass capacitor (0.1μF) required adjacent to pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting multiplexer architecture | Preserves signal polarity across all four channels - eliminates need for external inversion in data path design |
| Balanced propagation delays | Matched tPLH/tPHL across I→Y and S→Y paths - enables deterministic setup/hold timing in synchronous bus architectures |
| Wide supply voltage range (1.5V–5.5V) | Single device supports mixed-voltage system integration - reduces BOM count in multi-rail designs |
| ±24mA output drive | Directly interfaces with legacy TTL loads or drives controlled-impedance PCB traces without external buffers |
| SCR-latchup-resistant CMOS process | Guarantees immunity to destructive latch-up events under transient overvoltage or hot-swap conditions |
Applications
| Industrial PLC I/O Expansion | Military Data Acquisition Systems |
|---|---|
Use Scenario: Multiplexing analog-to-digital converter (ADC) channel selection signals across multiple sensor banks in a ruggedized control cabinet. IC Role / Device Role / Timing Role: Quad 2:1 mux selects one of two parallel data streams per ADC group under microcontroller command; OE enables time-division multiplexing of shared bus lines. Use Value: Reduces microcontroller GPIO count by 50% versus discrete gating; -55°C to +125°C rating ensures reliability in unconditioned enclosures. |
Use Scenario: Routing telemetry data from redundant sensor pairs in airborne avionics subsystems requiring fault-tolerant signal selection. IC Role / Device Role / Timing Role: Selects primary or backup sensor output per channel using voting logic; three-state outputs isolate failed channels from shared backplane. Use Value: MIL-qualified temperature range and >2kV ESD withstand support DO-160 Section 22 compliance; non-inverting behavior preserves signal integrity in safety-critical paths. |
| Automotive Body Control Module | Test Equipment Signal Routing |
Use Scenario: Consolidating door lock actuator status feedback from left/right mirror assemblies onto a single CAN transceiver input line. IC Role / Device Role / Timing Role: Uses S input to alternate between driver-side and passenger-side status bits; OE synchronizes updates with CAN frame boundaries. Use Value: 5V-tolerant inputs interface directly with 12V-based sensor supplies; ±24mA drive handles long harness runs without signal degradation. |
Use Scenario: Configuring stimulus/response paths in automated test equipment (ATE) that routes DUT signals to multiple measurement instruments. IC Role / Device Role / Timing Role: Enables dynamic reconfiguration of signal chains - e.g., selecting between calibration reference or DUT output before digitization. Use Value: 8.5ns propagation delay allows sub-100ns switching within ATE timing windows; PDIP package simplifies socket-based board-level replacement. |
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 |
|---|---|---|---|
| CD74ACT257E | Inverting outputs; 5V-only supply (4.5V–5.5V); faster 7.3ns propagation delay at 5V | Required where signal inversion is acceptable or needed; unsuitable for 3.3V-only systems | Choose CD74ACT257E when driving legacy TTL loads or when tighter timing margins demand lower delay |
| SN74LV4052A | Dual 4:1 analog/digital multiplexer; 2.0V–5.5V supply; bidirectional signal flow; no three-state outputs | Supports analog signal routing and bidirectional buses; lacks OE-controlled high-Z isolation | Choose SN74LV4052A when routing analog sensors or bidirectional data lines, not for strict digital bus isolation |
Compared with CD74ACT257E and SN74LV4052A, the CD74AC257E uniquely combines wide-voltage operation, non-inverting logic, and three-state bus isolation - making it optimal for mixed-supply digital systems requiring clean bus arbitration without polarity reversal.
Availability
CD74AC257E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, military data acquisition systems, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC257E 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision logic, power management, and signal chain technologies.
The CD74AC257E belongs to TI's Advanced CMOS Logic family, engineered for high-speed, low-power digital signal routing in harsh-environment applications where reliability, wide voltage tolerance, and ESD resilience are mandatory.
FAQ
What is the maximum operating supply voltage for CD74AC257E?
The CD74AC257E supports an absolute maximum supply voltage of 6V, but its recommended operating range is 1.5V to 5.5V. Operation above 5.5V risks permanent damage per Absolute Maximum Ratings. For reliable long-term use, maintain VCC within 1.5V–5.5V across the full -55°C to +125°C temperature range. The CD74AC257E datasheet specifies electrical characteristics only within this recommended window.
Does CD74AC257E support 3.3V logic levels?
Yes, CD74AC257E fully supports 3.3V logic operation. At VCC = 3.3V, its input thresholds are VIH ≥ 2.1V and VIL ≤ 0.9V, providing 1.2V noise margin. Output VOH ≥ 2.9V and VOL ≤ 0.1V meet 3.3V LVTTL requirements. The CD74AC257E maintains specified propagation delay (13ns max at 3.3V) and ±24mA drive strength at this voltage.
How does the Output Enable (OE) pin function on CD74AC257E?
The OE pin on CD74AC257E is active-low: when OE = HIGH, all four outputs (1Y–4Y) enter high-impedance state regardless of S or input states; when OE = LOW, outputs respond normally to S and data inputs. This enables bus sharing across multiple CD74AC257E devices or other peripherals on a common data path. The CD74AC257E datasheet confirms OE overrides all other controls.
Can CD74AC257E replace CD74ACT257E in existing designs?
CD74AC257E can replace CD74ACT257E only if signal inversion is not required and supply voltage may drop below 4.5V. The CD74AC257E has non-inverting outputs and 1.5V–5.5V operation, whereas CD74ACT257E is inverting and limited to 4.5V–5.5V. Pinout and functionality are identical, but logic polarity and voltage range differences must be verified in the target application before substitution.
What thermal considerations apply to CD74AC257E in PDIP package?
CD74AC257E in PDIP (N) package has a junction-to-ambient thermal resistance (RθJA) of 119.9°C/W. At maximum 160μA quiescent current and worst-case switching, self-heating remains negligible below 70°C ambient. No heatsink is required, but ensure ≥250 mils clearance around the CD74AC257E and use 0.1μF bypass capacitors at VCC to minimize dynamic heating from supply transients.
CD74AC257E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
CD74AC257E FAQ
1.How can I place an order for CD74AC257E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC257E 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 CD74AC257E reliable?
The price and inventory of CD74AC257E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC257E is usually 5 days.
3.What payment methods are accepted for CD74AC257E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC257E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC257E?
CD74AC257E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC257E 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 CD74AC257E?
For technical support, including CD74AC257E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC257E requirements.
6.How does Aetrix verify that CD74AC257E is sourced from the original manufacturer or authorized distributors?
All CD74AC257E 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 CD74AC257E meets industry standards.
7.What is the process for return or replacement of CD74AC257E?
All CD74AC257E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC257E, 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 CD74AC257E part is unused and in its original packaging.
Return procedure for CD74AC257E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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