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Texas Instruments CD74HC157MT
- Part No.:
- CD74HC157MT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC157MT.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
CD74HC157MT 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 packaging. 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.
For engineers reviewing the CD74HC157MT datasheet, CD74HC157MT pinout, CD74HC157MT application, or CD74HC157MT equivalent, key selection criteria include its HC logic family voltage flexibility, guaranteed operation across extended temperature, non-inverting output behavior, and compatibility with LSTTL fanout loads (10 units).
Technical Context
The CD74HC157MT implements four independent 2:1 multiplexers sharing one select line (S) and one active-low enable (E). 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-series CMOS architecture ensures rail-to-rail input thresholds (VIH = 1.5V min at 2V, 4.2V min at 6V) and low static current (ICC ≤160 µA over full temp range).
Propagation delays are specified per path: data-to-output (tPLH/tPHL ≤38 ns at 6V/50pF), enable-to-output (≤35 ns), and select-to-output (≤38 ns). Input capacitance is 10 pF; power dissipation capacitance is 62 pF, enabling accurate dynamic power estimation via PD = VCC² × fi × (CPD + CL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC (High-Speed CMOS), compatible with 2V–6V supply; no LSTTL input level dependency |
| Operating Temperature | -55°C to +125°C - qualified for military-grade and harsh-environment embedded systems |
| Propagation Delay | ≤38 ns at VCC = 6V, CL = 50pF - enables reliable timing in sub-25 MHz digital control paths |
| Output Drive | 10 LSTTL loads - sufficient to drive standard TTL inputs without buffering in mixed-logic systems |
| Input Thresholds | VIH ≥1.5V (2V VCC), ≥4.2V (6V VCC); VIL ≤0.5V (2V VCC), ≤1.8V (6V VCC) - provides robust noise immunity (NIL/NIH = 30% of VCC) |
| Quiescent Current | ICC ≤160 µA at -55°C to +125°C - supports low-power standby modes in battery-backed or energy-constrained designs |
| Package | 16-pin SOIC (D package), RoHS-compliant, MSL Level-1 - suitable for automated SMT assembly and reflow |
Pinout & Package
CD74HC157MT is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with 1.27 mm pitch, body width 3.9 mm, and JEDEC MS-012AC compliant outline. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E (Enable, active-low) | Global control: pulls all Y outputs low when logic high; disables multiplexing |
| 2–3, 5–6, 10–11, 13–14 | I0/I1 inputs (four pairs) | Data sources per channel; high-impedance CMOS inputs with ≤1 µA leakage |
| 4, 7, 12, 15 | Y outputs (1Y–4Y) | Non-inverting selected outputs; drive capability supports 10 LSTTL loads |
| 9 | S (Select) | Common control: selects I0 (S = low) or I1 (S = high) across all four channels |
| 8 | GND | Ground reference for logic and power; must be low-impedance for noise immunity |
| 16 | VCC | Positive supply (2V–6V); decoupling capacitor required near pin for switching stability |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 non-inverting mux topology | Enables simultaneous routing of four parallel data bits with single-select arbitration - reduces control logic overhead vs. discrete gates |
| Wide 2V–6V supply range | Supports direct interface with 3.3V microcontrollers, 5V legacy peripherals, and 2V sensor interfaces without level shifters |
| Balanced propagation delay | Ensures consistent timing skew (<5 ns variation between channels) critical for synchronous bus applications |
| High noise immunity (30% VCC) | Rejects EMI and crosstalk in noisy industrial environments without external filtering |
| Extended temperature operation | Validated performance from -55°C to +125°C - eliminates derating calculations for aerospace, automotive under-hood, or downhole tools |
Applications
| Industrial PLC I/O Expansion | Aerospace Avionics Data Bus Switching |
|---|---|
Use Scenario: Multiplexing analog-to-digital converter (ADC) channel selection signals and digital status lines across multiple sensor modules in a modular I/O rack. IC Role / Device Role / Timing Role: Quad 2:1 mux selects between primary and redundant sensor data paths under firmware control via shared S and E lines. Use Value: Reduces PCB routing complexity by consolidating four independent select functions into one IC, lowering BOM count and layout area by 75% vs. discrete solutions. | Use Scenario: Routing telemetry data from dual-redundant flight computers to a central health-monitoring unit in real-time avionics systems. IC Role / Device Role / Timing Role: Non-inverting multiplexer ensures zero added inversion delay during failover; enables deterministic <38 ns path latency at 6V supply. Use Value: Meets DO-254 timing budget constraints for safety-critical data switching without requiring additional timing compensation logic. |
| Test Equipment Signal Path Selection | Automotive Body Control Module Logic |
Use Scenario: Configuring stimulus signal routing between multiple DUT (device-under-test) ports and shared measurement instrumentation in ATE platforms. IC Role / Device Role / Timing Role: Enables fast, synchronized channel switching across four test nodes using a single select bus and global enable strobe. Use Value: Achieves <100 ns total path uncertainty (propagation + skew), supporting sub-10 MHz pattern rates in production test fixtures. | Use Scenario: Arbitrating between dashboard display controller and diagnostic port signals feeding a shared CAN transceiver interface in vehicle body ECUs. IC Role / Device Role / Timing Role: Selects between functional and service-mode data streams under microcontroller command, with E asserted during sleep mode to isolate outputs. Use Value: Eliminates need for external pull-down resistors on unused signal lines, reducing quiescent current by >20 µA per channel in low-power states. |
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 |
|---|---|---|---|
| CD74HCT157MT | HCT variant: 4.5V–5.5V only; LSTTL-compatible inputs (VIH ≥2V, VIL ≤0.8V); identical pinout and function | Required where interfacing directly with legacy 5V TTL logic without level translation | Select CD74HCT157MT only if system uses strict 5V TTL signaling; otherwise CD74HC157MT offers broader supply flexibility. |
| SN74LV157APW | LV family: 2V–5.5V; lower drive (8 LSTTL loads); faster max speed (28 ns @ 5V); TSSOP-16 package | Better suited for space-constrained, high-density PCBs where SOIC footprint is prohibitive | Choose SN74LV157APW when board area is critical and 8-load drive suffices; verify thermal performance in sealed enclosures. |
Compared with CD74HCT157MT and SN74LV157APW, the CD74HC157MT uniquely balances wide-voltage operation, military-grade temperature range, and proven reliability in long-lifecycle industrial deployments - making it preferred for systems requiring field longevity over peak speed or minimal footprint.
Availability
CD74HC157MT is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, aerospace avionics data bus switching, and automotive body control module logic requiring stable component supply across extended temperature ranges and multi-decade product lifecycles.
Supply support for CD74HC157MT 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualification coverage.
The CD74HC157MT belongs to TI's legacy high-speed CMOS logic portfolio, designed specifically for robust, wide-temperature digital signal routing in mission-critical embedded systems where reliability outweighs ultra-high speed.
FAQ
What is the maximum supply voltage rating for CD74HC157MT?
The absolute maximum DC supply voltage for CD74HC157MT is 7V, but the recommended operating range is 2V to 6V. Operation above 6V risks exceeding internal oxide breakdown limits and is not characterized. At 6V, the device delivers optimal speed (≤38 ns propagation delay) and noise margin (30% of VCC), making it the upper practical limit for sustained use.
Does CD74HC157MT support 3.3V logic systems?
Yes, CD74HC157MT fully supports 3.3V operation: VIH is guaranteed ≥2.1V (30% of 3.3V) and VIL ≤1.0V, providing 1.3V noise margin. Its 2V–6V supply range allows direct connection to 3.3V microcontrollers and FPGAs without level-shifting, and ICC remains ≤80 µA at 25°C - ideal for mixed-voltage digital subsystems.
How does the enable (E) pin behave in CD74HC157MT?
In CD74HC157MT, the E pin is active-low: when E = high, all four Y outputs (1Y–4Y) are forced low regardless of S or input states. When E = low, the multiplexer operates normally - routing I0 or I1 to Y based on S. This behavior enables global output disable for bus isolation, power gating, or fault-safe shutdown in safety-critical designs.
Is CD74HC157MT pin-compatible with CD74HCT157MT?
Yes, CD74HC157MT and CD74HCT157MT share identical 16-pin SOIC (D package) pinouts, terminal functions, and truth tables. The only differences are electrical: HC operates from 2V–6V with CMOS input thresholds, while HCT is limited to 4.5V–5.5V with TTL-compatible inputs. No PCB changes are required for substitution - only verify system voltage and input source compatibility.
What is the thermal resistance (θJA) of CD74HC157MT in SOIC package?
The junction-to-ambient thermal resistance (θJA) for CD74HC157MT in its 16-pin SOIC (D) package is 73°C/W under typical JEDEC-standard PCB conditions (2-layer board, 1 in² copper). This value assumes no internal power dissipation exceeding 100 mW - well within the device's 500 mW absolute maximum - and confirms suitability for convection-cooled industrial enclosures without heatsinking.
CD74HC157MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
CD74HC157MT FAQ
1.How can I place an order for CD74HC157MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC157MT 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 CD74HC157MT reliable?
The price and inventory of CD74HC157MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC157MT is usually 5 days.
3.What payment methods are accepted for CD74HC157MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC157MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC157MT?
CD74HC157MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC157MT 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 CD74HC157MT?
For technical support, including CD74HC157MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC157MT requirements.
6.How does Aetrix verify that CD74HC157MT is sourced from the original manufacturer or authorized distributors?
All CD74HC157MT 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 CD74HC157MT meets industry standards.
7.What is the process for return or replacement of CD74HC157MT?
All CD74HC157MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC157MT, 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 CD74HC157MT part is unused and in its original packaging.
Return procedure for CD74HC157MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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