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Texas Instruments CD74HCT157M
- Part No.:
- CD74HCT157M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT157M.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
CD74HCT157M from Texas Instruments is a quad 2-input non-inverting multiplexer IC used for data routing in digital logic systems. It features active-low enable (E), common select (S), 4-bit parallel data selection, 4.5V–5.5V supply operation, and guaranteed LSTTL input compatibility (VIL ≤ 0.8 V, VIH ≥ 2.0 V). It is commonly deployed in register-to-bus data transfer and combinational logic function generation.
For engineers reviewing the CD74HCT157M datasheet, CD74HCT157M pinout, CD74HCT157M application, or CD74HCT157M equivalent, key selection considerations include its HCT-family TTL-compatible inputs, -55°C to +125°C operating range, SOIC-16 package, propagation delay of 25–38 ns (at VCC = 4.5 V, CL = 50 pF), and low quiescent current (≤160 µA over full temperature range).
Technical Context
The CD74HCT157M implements four independent 2:1 multiplexers sharing one common Select (S) input and one active-low Enable (E) input. Each output (1Y–4Y) drives low when E is high, and selects between corresponding I0/I1 inputs based on S state when enabled.
It uses CMOS silicon-gate technology with HCT-level input thresholds, ensuring direct interface with legacy LSTTL outputs without level-shifting. Its balanced propagation delays (tPLH ≈ tPHL) and low output transition times (15–22 ns at 4.5 V) support clean timing in synchronous bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V) |
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V rails with ±5% tolerance |
| Operating Temperature | -55°C to +125°C - Qualified for extended-range military and automotive under-hood applications |
| Propagation Delay (Data→Output) | 25 ns (typ), 38 ns (max) at VCC = 4.5 V, CL = 50 pF - Enables reliable 20+ MHz data switching in combinatorial paths |
| Output Drive Capability | ±4 mA (min) at VCC = 4.5 V - Sufficient to drive 10 LSTTL loads without buffering |
| Quiescent Current (ICC) | ≤160 µA (max) over full temp range - Supports low-power standby modes in battery-backed systems |
| Input Leakage Current | ±1 µA (max) at VCC = 5.5 V - Minimizes unintended node loading in high-impedance control paths |
Pinout & Package
CD74HCT157M is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, 3.9 mm wide, with standard JEDEC MS-012AC outline and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E) | Active-Low Enable | Disables all outputs (forces 1Y–4Y low) when high; required for functional operation |
| 2 (1I0) | Data Input 0, Channel 1 | First input source for multiplexer channel 1; selected when S = low |
| 3 (1I1) | Data Input 1, Channel 1 | Second input source for channel 1; selected when S = high |
| 4 (1Y) | Non-Inverting Output, Channel 1 | Pass-through output reflecting selected input (1I0 or 1I1) with no inversion |
| 5 (2I0) | Data Input 0, Channel 2 | First input for channel 2; shares S and E with other channels |
| 6 (2I1) | Data Input 1, Channel 2 | Second input for channel 2; enables parallel 4-bit selection |
| 7 (GND) | Ground Reference | Primary return path for logic and supply currents; must be low-impedance |
| 8 (2Y) | Non-Inverting Output, Channel 2 | Output for channel 2; matches timing behavior of 1Y–4Y |
| 9 (3Y) | Non-Inverting Output, Channel 3 | Third output; maintains consistent fanout and loading across all four channels |
| 10 (4Y) | Non-Inverting Output, Channel 4 | Fourth output; completes quad-mux functionality for byte-wide data paths |
| 11 (4I0) | Data Input 0, Channel 4 | Final I0 input; supports simultaneous 4-bit multiplexing from two 4-bit sources |
| 12 (4I1) | Data Input 1, Channel 4 | Final I1 input; allows full parallel selection without cascading |
| 13 (3I0) | Data Input 0, Channel 3 | Third I0 input; aligns with standard pinout for PCB layout consistency |
| 14 (3I1) | Data Input 1, Channel 3 | Third I1 input; ensures symmetrical trace routing in dense layouts |
| 15 (VCC) | Positive Supply | 5 V nominal power rail; decoupling capacitor (0.1 µF) required near pin |
| 16 (S) | Common Select | Global 1-bit control determining which of two 4-bit sources appears on outputs |
Key Features
| Feature | Design Value |
|---|---|
| Direct LSTTL input compatibility | Eliminates need for external level shifters when interfacing with legacy 5 V TTL logic families |
| Common select and enable architecture | Reduces control signal count by 75% versus discrete 2:1 muxes - only two control lines for four channels |
| Balanced tPLH/tPHL propagation | Minimizes duty cycle distortion in clocked data paths and avoids setup/hold violations |
| Wide temperature range (-55°C to +125°C) | Supports deployment in uncontrolled environments including aerospace, defense, and under-hood automotive |
| Low dynamic power consumption | CPD = 70 pF enables <1 mW typical active power at 1 MHz toggle rate and 5 V supply |
Applications
| Register File Data Routing | Bus Arbitration Logic |
|---|---|
Use Scenario: Selecting between two 4-bit register banks (e.g., accumulator vs. temporary storage) during ALU read cycles in microcontroller datapaths. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing synchronized 4-bit data path selection under shared S and E control. Use Value: Reduces gate count and routing congestion versus discrete gates; maintains nanosecond-level timing alignment across all four bits. | Use Scenario: Resolving contention among multiple peripherals requesting access to a shared 4-bit status/data bus in embedded controllers. IC Role / Device Role / Timing Role: Enabling one peripheral's data onto the bus while blocking others via E assertion. Use Value: Provides deterministic, glitch-free bus ownership handoff without requiring additional arbitration state machines. |
| Function Generator Implementation | Test Pattern Selection |
Use Scenario: Implementing arbitrary 2-input Boolean functions (e.g., AND, OR, XOR, NAND) using fixed I0/I1 inputs and programmable S/E control. IC Role / Device Role / Timing Role: Combinational logic block mapping truth table entries to physical I0/I1 pins and selecting rows via S. Use Value: Delivers configurable logic with zero configuration latency - no programming time or memory overhead. | Use Scenario: Switching between diagnostic, calibration, and operational test vectors applied to DUT inputs in automated test equipment. IC Role / Device Role / Timing Role: Static selection of pre-defined 4-bit stimulus patterns routed from two vector sources. Use Value: Enables rapid test mode changes via single-pin control (S), reducing test sequence complexity and execution time. |
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 |
|---|---|---|---|
| SN74HCT157DR | Same logic function, identical pinout, same HCT specs; TI second-source with identical SOIC-16 packaging and tape-and-reel (2500 pc) format | No functional or layout impact; fully interchangeable in existing designs using CD74HCT157M | Select when seeking alternate TI sourcing with identical form-fit-function and lifecycle support |
| MC74HCT157ADR2G | Pin-compatible but manufactured by ON Semiconductor; meets same HCT electrical specs (VIH/VIL, tPD, ICC), though propagation delay max is 40 ns (vs. 38 ns) | Suitable for non-critical timing paths; requires validation if operating near 20 MHz switching limits | Choose for multi-source procurement strategy where minor timing margin relaxation is acceptable |
Compared with SN74HCT157DR, CD74HCT157M offers identical performance and footprint but differs in part marking and internal lot traceability; versus MC74HCT157ADR2G, CD74HCT157M provides tighter propagation delay control critical for high-speed synchronous designs.
Availability
CD74HCT157M is available at Aetrix Electronics and suitable for industrial control interfaces, aerospace avionics subsystems, and automotive engine management modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT157M 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 CD74HCT157M belongs to TI's legacy High-Speed CMOS (HCT) logic family, designed specifically to bridge TTL and CMOS systems with robust noise immunity, wide temperature operation, and drop-in compatibility for legacy 5 V digital designs.
FAQ
What is the maximum clock/data toggle frequency supported by CD74HCT157M?
The CD74HCT157M does not operate on a clock; it is a combinational device. Its usable data switching frequency depends on propagation delay and system timing margins. With a maximum tPD of 38 ns (at VCC = 4.5 V, CL = 50 pF), CD74HCT157M supports reliable data routing up to approximately 20 MHz in well-designed paths with adequate setup/hold margins. Higher frequencies require careful PCB layout and load management.
Is CD74HCT157M pin-compatible with CD74HC157M?
Yes, CD74HCT157M is pin-compatible with CD74HC157M - both use identical SOIC-16 packaging and share the same pinout for E, S, I0/I1 inputs, and Y outputs. However, CD74HCT157M uses HCT input thresholds (TTL-compatible), while CD74HC157M uses HC thresholds (CMOS-compatible), so voltage-level interoperability must be verified per application.
Does CD74HCT157M support mixed-voltage operation (e.g., 3.3 V inputs with 5 V supply)?
No. CD74HCT157M is specified only for 4.5 V–5.5 V supply operation and requires input voltages compatible with TTL thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). Applying 3.3 V logic signals directly may result in marginal or non-functional VIH recognition. For mixed-voltage systems, level translators or 3.3 V–tolerant variants like SN74LVC157A should be used instead of CD74HCT157M.
What is the recommended bypass capacitor value for CD74HCT157M?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC (pin 15) and GND (pin 7) pins is the standard recommendation for CD74HCT157M. This minimizes high-frequency supply noise and transient droop during output switching. For systems with heavy simultaneous switching or noisy environments, adding a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor nearby further stabilizes the local 5 V rail feeding CD74HCT157M.
Can CD74HCT157M be used in place of CD74HCT158M?
No. CD74HCT157M is a non-inverting quad 2:1 multiplexer, whereas CD74HCT158M is an inverting version - its outputs (1Y–4Y) are inverted relative to the selected input. Swapping them causes functional inversion errors unless compensated in upstream/downstream logic. The pinouts are identical, but logic behavior is fundamentally different; CD74HCT157M cannot serve as a drop-in replacement for CD74HCT158M.
CD74HCT157M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 4mA, 4mA
- 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
CD74HCT157M FAQ
1.How can I place an order for CD74HCT157M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT157M 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 CD74HCT157M reliable?
The price and inventory of CD74HCT157M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT157M is usually 5 days.
3.What payment methods are accepted for CD74HCT157M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT157M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT157M?
CD74HCT157M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT157M 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 CD74HCT157M?
For technical support, including CD74HCT157M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT157M requirements.
6.How does Aetrix verify that CD74HCT157M is sourced from the original manufacturer or authorized distributors?
All CD74HCT157M 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 CD74HCT157M meets industry standards.
7.What is the process for return or replacement of CD74HCT157M?
All CD74HCT157M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT157M, 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 CD74HCT157M part is unused and in its original packaging.
Return procedure for CD74HCT157M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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