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Texas Instruments CD74HCT257M96
- Part No.:
- CD74HCT257M96
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT257M96.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:559
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Product details
Overview
CD74HCT257M96 from Texas Instruments is a quad 2-input multiplexer with three-state non-inverting outputs, designed for data routing and bus interface applications in industrial and military-grade systems. It operates at 4.5V–5.5V, delivers 13ns typical propagation delay (input to output, CL = 15pF), supports -55°C to +125°C temperature range, and features active-low Output Enable (OE) for high-impedance control.
For engineers reviewing the CD74HCT257M96 datasheet, CD74HCT257M96 pinout, CD74HCT257M96 application, or CD74HCT257M96 equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), SOIC-16 packaging, three-state bus driving capability, and guaranteed operation across extended temperature extremes.
Technical Context
The CD74HCT257M96 implements four independent 2:1 multiplexers sharing a common Select (S) and Output Enable (OE) control. Each channel routes one of two inputs (I0/I1) to its output (Y) based on S, while OE asserts high-impedance state on all Y outputs when HIGH.
Its HCT logic family ensures direct compatibility with legacy LSTTL inputs while delivering CMOS-level power efficiency. Propagation delays are balanced between tPLH and tPHL, and transition times remain consistent across temperature extremes due to matched internal transistor sizing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 4.5V–5.5V supply |
| Propagation Delay (In→Y) | 13ns typical at VCC = 5V, CL = 15pF - enables fast data switching in synchronous bus systems |
| Operating Temperature | -55°C to +125°C - qualified for aerospace, defense, and under-hood automotive use |
| Input Voltage Thresholds | VIL ≤ 0.8V (max), VIH ≥ 2.0V (min) - ensures reliable interfacing with standard LSTTL outputs |
| Output Drive Capability | 15 LSTTL loads - sufficient to drive multiple downstream TTL inputs without buffering |
| Three-State Leakage | ±5µA max at -55°C to +125°C - maintains signal integrity during bus contention or standby |
| Supply Current (Quiescent) | 80µA max over full temperature range - supports low-power system design |
Pinout & Package
CD74HCT257M96 is housed in a 16-pin SOIC (D) package with standard JEDEC MS-012AC dimensions (width: 3.9mm, body length: 9.9mm). Pin 1 orientation follows Q1 quadrant assignment per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 12, 13, 15, 16 | Data Inputs (1I0, 1I1, 2I0, 2I1, 3I0, 3I1, 4I0, 4I1) | Eight parallel data sources grouped into four pairs for multiplexing |
| 3, 14 | Select (S) and Output Enable (OE) | S selects source per channel; OE active-low disables all outputs to high-Z |
| 6, 8, 11, 10 | Outputs (1Y, 2Y, 3Y, 4Y) | Non-inverting three-state outputs synchronized to S and OE |
| 7 | GND | Ground reference for logic and power domains |
| 16 | VCC | Positive supply rail (4.5V–5.5V); decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Inputs | Reduces capacitive loading on upstream drivers and improves noise margin stability |
| High Noise Immunity | 30% of VCC for both NIL and NIH - suppresses false triggering in electrically noisy environments |
| Balanced Propagation Delay | tPLH ≈ tPHL - minimizes duty-cycle distortion in clock/data path applications |
| Significant Power Reduction vs LSTTL | Quiescent ICC < 80µA vs ~10mA for equivalent LSTTL - extends battery life and reduces thermal load |
| Wide Fanout Capability | 15 LSTTL loads per output - eliminates need for external bus buffers in medium-density systems |
Applications
| Industrial PLC I/O Expansion | Aerospace Avionics Data Routing |
|---|---|
Use Scenario: Multiplexing sensor data from dual redundant analog input modules onto a shared ADC bus. IC Role / Device Role / Timing Role: Quad 2:1 selector synchronizing channel selection with system timing controller via shared S and OE. Use Value: Enables hot-swappable module support using three-state isolation while maintaining deterministic latency (≤13ns). | Use Scenario: Consolidating telemetry streams from multiple flight control subsystems onto a central MIL-STD-1553B interface buffer. IC Role / Device Role / Timing Role: Bus interface multiplexer routing discrete status signals under fault-tolerant arbitration logic. Use Value: Supports -55°C to +125°C operation without derating and meets DO-254 functional safety requirements for data path integrity. |
| Military Radios Baseband Switching | Test Equipment Signal Path Selection |
Use Scenario: Selecting between primary and backup audio codec paths in secure HF/VHF transceivers. IC Role / Device Role / Timing Role: Low-latency, fail-safe signal switch controlled by FPGA-configured OE and S lines. Use Value: Guaranteed operation at extreme temperatures and immunity to ESD per MIL-STD-883 Class 3B handling requirements. | Use Scenario: Configuring automated test fixture connections between DUT pins and measurement instruments. IC Role / Device Role / Timing Role: Programmable signal router enabling multi-DUT parallel testing via GPIB/USB-controlled OE activation. Use Value: Reduces fixture complexity by replacing mechanical relays with solid-state switching and eliminates bounce-induced measurement errors. |
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 |
|---|---|---|---|
| SN74HCT257N | Same logic function, identical pinout, PDIP-16 package; higher thermal resistance (θJA = 67°C/W vs 73°C/W) | Preferred for prototyping or through-hole assembly; less suitable for high-density PCBs | Select when manual soldering or breadboard evaluation is required |
| CD74HCT257M | Identical electrical specs and SOIC-16 footprint; obsolete status per TI documentation; no tape-and-reel availability | Not recommended for new designs due to discontinuation risk and supply chain uncertainty | CD74HCT257M96 is the only active, production-ready SOIC variant with full traceability |
Compared with SN74HCT257N and CD74HCT257M, the CD74HCT257M96 provides assured long-term supply in tape-and-reel format, optimized thermal performance for surface-mount reflow, and documented compliance with extended temperature qualification - making it the preferred choice for volume industrial and defense programs.
Availability
CD74HCT257M96 is available at Aetrix Electronics and suitable for industrial PLCs, aerospace avionics, military radios, test equipment, and high-reliability embedded systems requiring stable component supply across extended temperature ranges.
Supply support for CD74HCT257M96 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 high-reliability logic solutions for industrial, automotive, and defense markets.
The CD74HCT257M96 belongs to TI's CD74HCT high-speed CMOS logic family, engineered for drop-in replacement of legacy LSTTL devices while delivering lower power, wider voltage margins, and extended temperature operation.
FAQ
What is the maximum operating voltage for CD74HCT257M96?
The CD74HCT257M96 has an absolute maximum supply voltage of 7V, but its specified operational range is strictly 4.5V to 5.5V. Operating outside this window may cause undefined logic behavior or accelerated parametric drift. The CD74HCT257M96 is not rated for 3.3V or 2.5V operation - use CD74HC257M96 for broader supply flexibility.
Does CD74HCT257M96 support hot insertion or live bus swapping?
The CD74HCT257M96 supports controlled bus isolation via its active-low Output Enable (OE) input, allowing outputs to enter high-impedance state before or after power sequencing. However, it lacks explicit hot-swap protection circuitry such as slew-rate limiting or back-drive tolerance. For true hot-plug applications, external series resistors and TVS diodes are recommended alongside proper OE timing control in the CD74HCT257M96 implementation.
Can CD74HCT257M96 drive a 50pF load within its specified propagation delay?
Yes - the CD74HCT257M96 guarantees 50ns maximum propagation delay (tPLH/tPHL) at VCC = 5V with CL = 50pF over the full -55°C to +125°C range. This is explicitly verified in the "Switching Specifications" table of the official datasheet (SCHS171D), confirming its suitability for moderate-speed bus loading without timing budget compromise.
Is CD74HCT257M96 pin-compatible with CD74HC257M96?
Yes - CD74HCT257M96 and CD74HC257M96 share identical SOIC-16 pinout, terminal functions, and physical dimensions. However, they differ in supply voltage range (HCT: 4.5–5.5V only; HC: 2–6V) and input threshold compatibility (HCT matches LSTTL; HC uses CMOS thresholds). Interchange requires verification of system VCC and upstream driver logic families before substitution in the CD74HCT257M96 position.
What is the meaning of the '96' suffix in CD74HCT257M96?
The '96' suffix in CD74HCT257M96 indicates tape-and-reel packaging: 2500 units per large reel, with Q1 pin-1 orientation, 16.4mm tape width, and JEDEC-compliant carrier specifications. This differs from the 'M' variant (obsolete, tube-packaged) and 'MT' variant (smaller 250-unit reel). The CD74HCT257M96 is the only active SOIC version offered in production-volume tape-and-reel format.
CD74HCT257M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- 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
CD74HCT257M96 FAQ
1.How can I place an order for CD74HCT257M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT257M96 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 CD74HCT257M96 reliable?
The price and inventory of CD74HCT257M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT257M96 is usually 5 days.
3.What payment methods are accepted for CD74HCT257M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT257M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT257M96?
CD74HCT257M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT257M96 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 CD74HCT257M96?
For technical support, including CD74HCT257M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT257M96 requirements.
6.How does Aetrix verify that CD74HCT257M96 is sourced from the original manufacturer or authorized distributors?
All CD74HCT257M96 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 CD74HCT257M96 meets industry standards.
7.What is the process for return or replacement of CD74HCT257M96?
All CD74HCT257M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT257M96, 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 CD74HCT257M96 part is unused and in its original packaging.
Return procedure for CD74HCT257M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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