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Texas Instruments CD74HC157M
- Part No.:
- CD74HC157M
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC157M.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
CD74HC157M from Texas Instruments is a high-speed CMOS quad 2-input non-inverting multiplexer with active-low enable (E), common select (S), and 16-pin SOIC package. It operates from 2V to 6V, supports -55°C to +125°C industrial/military temperature range, delivers ≤38 ns propagation delay at 6V/50pF, and forces all outputs low when enabled. It is used in register-to-bus data routing and logic function generation in embedded control systems.
For engineers reviewing the CD74HC157M datasheet, CD74HC157M pinout, CD74HC157M application, or CD74HC157M equivalent, key selection criteria include its HC logic family voltage flexibility, guaranteed operation across extended temperature, non-inverting output behavior, and compatibility with LSTTL loads via buffered I/O.
Technical Context
The CD74HC157M implements four independent 2:1 multiplexers sharing one common select (S) and one active-low enable (E) input. Each channel routes either I0 or I1 to Y based on S state when E is low; all Y outputs go low when E is high.
Its HC logic family ensures rail-to-rail input thresholds (VIH = 1.5V min at 2V, 4.2V min at 6V; VIL = 0.5V max at 2V, 1.8V max at 6V), 10 LSTTL fanout capability, and quiescent current as low as 8 µA at 25°C - enabling low-power digital signal routing without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC (High-Speed CMOS); enables 2V–6V single-supply operation with CMOS input compatibility and high noise immunity (NIL/NIH = 30% of VCC). |
| Function | Quad 2-input non-inverting multiplexer; selects one of two data sources per channel using shared S and active-low E. |
| Propagation Delay | ≤38 ns (max) at VCC = 6V, CL = 50pF; ensures timing predictability in synchronous bus interfaces up to ~10 MHz. |
| Operating Temperature | -55°C to +125°C; qualified for aerospace, defense, and harsh-environment industrial control applications. |
| Supply Voltage Range | 2V to 6V; supports battery-powered, mixed-voltage, and legacy 5V systems without external regulators. |
| Output Drive | ±25 mA per output; sufficient to drive 10 LSTTL loads directly, eliminating need for buffer stages in medium-fanout logic networks. |
| Input Leakage | ±1 µA max over full temperature range; minimizes static power loss and prevents unintended logic transitions in high-impedance nodes. |
Pinout & Package
CD74HC157M is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package (Package Drawing D), with standard 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E (Enable) | Active-low global enable; when high, forces all Y outputs low regardless of S or I0/I1 states. |
| 2 | 1I0 | Data input 0 for channel 1; routed to 1Y when S = low and E = low. |
| 3 | 1I1 | Data input 1 for channel 1; routed to 1Y when S = high and E = low. |
| 4 | 1Y | Non-inverting output for channel 1; reflects selected input (1I0 or 1I1) when E = low. |
| 5 | 2I0 | Data input 0 for channel 2; routed to 2Y when S = low and E = low. |
| 6 | 2I1 | Data input 1 for channel 2; routed to 2Y when S = high and E = low. |
| 7 | GND | Ground reference for all internal circuitry and I/O; must be connected to system ground plane. |
| 8 | 2Y | Non-inverting output for channel 2; reflects selected input (2I0 or 2I1) when E = low. |
| 9 | 3Y | Non-inverting output for channel 3; reflects selected input (3I0 or 3I1) when E = low. |
| 10 | 3I1 | Data input 1 for channel 3; routed to 3Y when S = high and E = low. |
| 11 | 3I0 | Data input 0 for channel 3; routed to 3Y when S = low and E = low. |
| 12 | 4Y | Non-inverting output for channel 4; reflects selected input (4I0 or 4I1) when E = low. |
| 13 | 4I1 | Data input 1 for channel 4; routed to 4Y when S = high and E = low. |
| 14 | VCC | Positive supply rail (2V–6V); powers internal logic and output drivers; requires local 0.1 µF decoupling. |
| 15 | 4I0 | Data input 0 for channel 4; routed to 4Y when S = low and E = low. |
| 16 | S | Common select input; controls source selection (I0 vs I1) across all four channels simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Common Select & Separate Enable | Single S line controls all four 2:1 paths; dedicated active-low E allows global output disable without affecting S or data inputs. |
| Buffered Inputs and Outputs | Reduces capacitive loading on driving logic and improves noise margin; supports direct connection to LSTTL and CMOS sources. |
| Extended Temperature Range | -55°C to +125°C operation verified per MIL-PRF-38535; suitable for avionics, downhole tools, and engine-control modules. |
| Low Quiescent Current | ICC ≤ 160 µA max over full temperature range; enables use in always-on subsystems with strict power budgets. |
| High Noise Immunity | NIL and NIH ≥ 30% of VCC at 5V; suppresses false triggering from EMI or crosstalk in dense PCB layouts. |
Applications
| Industrial PLC I/O Multiplexing | Aerospace Data Bus Switching |
|---|---|
|
Use Scenario: Consolidating analog sensor readings from dual redundant sensor sets into a single ADC interface within a flight control computer. IC Role / Device Role / Timing Role: Quad 2:1 selector routing either primary or backup sensor data per channel under command of flight software via S and E lines. Use Value: Enables hardware-level redundancy management with deterministic latency (<38 ns) and no external glue logic required. |
Use Scenario: Dynamically switching between two independent telemetry streams (nominal and test modes) before transmission over a MIL-STD-1553 bus interface. IC Role / Device Role / Timing Role: Non-inverting multiplexer providing glitch-free stream selection synchronized to bus controller timing signals. Use Value: Eliminates need for discrete switches or FPGA resources; maintains signal integrity with matched propagation delays across all four channels. |
| Automotive Engine Control Unit | Test Equipment Signal Routing |
|
Use Scenario: Selecting between crankshaft position sensor signals from two different mounting locations during calibration or fault recovery sequences. IC Role / Device Role / Timing Role: Enabling/disabling and selecting sensor inputs under microcontroller GPIO control, with E tied to safety watchdog status. Use Value: Provides fail-safe input isolation: E high forces all outputs low, signaling invalid sensor data to the MCU. |
Use Scenario: Automating stimulus routing in automated test equipment (ATE) that applies calibrated signals to multiple DUT pins in sequence. IC Role / Device Role / Timing Role: Channelized signal path selector controlled by pattern generator outputs, supporting parallel test of up to four devices. Use Value: Reduces test head complexity and wiring count; SOIC package allows dense placement on ATE daughterboards. |
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 |
|---|---|---|---|
| CD74HCT157M | HCT logic family: 4.5V–5.5V only; TTL-compatible inputs (VIH = 2V min, VIL = 0.8V max); identical pinout and function. | Required where legacy 5V TTL logic drives inputs directly without level shifters; not suitable for 2V–4.4V or 5.6V–6V supplies. | Select CD74HCT157M only when interfacing exclusively with LSTTL sources and supply is tightly regulated at 5V ±5%. |
| SN74LV157AIPW | LV family: 2V–5.5V operation; lower propagation delay (21 ns max at 5V); higher drive strength (±24 mA); same pinout and truth table. | Better suited for high-speed digital systems requiring tighter timing margins or driving heavier capacitive loads (>50 pF). | Choose SN74LV157AIPW when design targets <25 ns propagation or needs improved noise rejection at 3.3V operation. |
Compared with CD74HC157M, CD74HCT157M trades supply flexibility for direct TTL compatibility, while SN74LV157AIPW offers faster switching and broader 3.3V compatibility - making CD74HC157M optimal for wide-voltage, extended-temperature, and cost-sensitive industrial designs.
Availability
CD74HC157M is available at Aetrix Electronics and suitable for industrial PLC I/O multiplexing, aerospace data bus switching, automotive engine control units, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC157M 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 including the 74HC series.
The CD74HC157M belongs to TI's industry-standard 74HC logic portfolio, designed specifically for robust, low-power digital signal routing in mission-critical systems operating across extreme temperatures and mixed-voltage environments.
FAQ
What is the maximum supply voltage rating for CD74HC157M?
The absolute maximum DC supply voltage for CD74HC157M is 7V, but the recommended operating range is 2V to 6V per the HC logic family specification. Operation above 6V risks exceeding safe internal node voltages and may cause accelerated parametric drift or latent failure, especially at elevated temperatures. Always limit VCC to ≤6V in production designs.
Does CD74HC157M support 3.3V logic systems?
Yes, CD74HC157M fully supports 3.3V operation: VIH(min) = 2.31V and VIL(max) = 1.32V at VCC = 3.3V (interpolated from datasheet specs), ensuring reliable interfacing with standard 3.3V CMOS outputs. Its 2V–6V range makes it ideal for mixed-voltage boards where 3.3V controllers route data to 5V peripherals.
How does the enable (E) pin behave in CD74HC157M?
In CD74HC157M, the E pin is active-low: when E = high, all four Y outputs are forced low regardless of S or input states; when E = low, the multiplexer functions normally, routing I0 or I1 to Y based on S. This behavior enables global output disable for bus contention avoidance or power-gating control in CD74HC157M-based systems.
Is CD74HC157M pin-compatible with CD74HCT157M?
Yes, CD74HC157M and CD74HCT157M share identical 16-pin SOIC package dimensions, pin assignments, and functional truth table. The only differences are electrical: HC supports 2V–6V with CMOS input thresholds, while HCT is limited to 4.5V–5.5V with TTL-compatible inputs - making them drop-in replacements where supply and driver compatibility align.
What is the typical power dissipation of CD74HC157M at 5V?
At VCC = 5V and 25°C, CD74HC157M exhibits typical quiescent current (ICC) of 8 µA, yielding ~0.04 mW static power. Dynamic power depends on switching frequency and load capacitance: PD ≈ VCC² × f × (CPD + CL), where CPD = 62 pF. At 1 MHz and 50 pF load, total power is ~1.6 mW - confirming suitability for low-power embedded applications.
CD74HC157M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
CD74HC157M FAQ
1.How can I place an order for CD74HC157M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC157M 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 CD74HC157M reliable?
The price and inventory of CD74HC157M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC157M is usually 5 days.
3.What payment methods are accepted for CD74HC157M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC157M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC157M?
CD74HC157M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC157M 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 CD74HC157M?
For technical support, including CD74HC157M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC157M requirements.
6.How does Aetrix verify that CD74HC157M is sourced from the original manufacturer or authorized distributors?
All CD74HC157M 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 CD74HC157M meets industry standards.
7.What is the process for return or replacement of CD74HC157M?
All CD74HC157M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC157M, 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 CD74HC157M part is unused and in its original packaging.
Return procedure for CD74HC157M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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