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STMicroelectronics M74HC157B1R
- Part No.:
- M74HC157B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC157B1R.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,142
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Product details
Overview
M74HC157B1R from STMicroelectronics is a high-speed CMOS quad 2-channel multiplexer with common select and strobe inputs, operating across 2V–6V supply, delivering 10ns typical propagation delay at 6V, ±4mA output drive, and pin/function compatibility with standard 74-series 157 logic. It routes A/B data sources to four independent Y outputs in industrial control I/O expansion and digital signal routing applications.
For engineers reviewing the M74HC157B1R datasheet, M74HC157B1R pinout, M74HC157B1R application, or M74HC157B1R equivalent, key selection criteria include VCC range (2–6V), symmetrical IOH/IOL (≥4mA), low ICC (≤4µA), noise immunity (VNIH/VNIL ≥28% VCC), and DIP-16 package compatibility with legacy 74LS157 footprints.
Technical Context
The M74HC157B1R implements four independent 2:1 digital multiplexers sharing one SELECT line and one active-low STROBE enable. Its silicon gate C2MOS process ensures rail-to-rail input tolerance and robust ESD protection on all pins.
Propagation delays are balanced (tPLH ≅ tPHL), with worst-case tPHL/tPLH ≤26ns at 6V over –55°C to +125°C, and output transition times ≤19ns under CL = 50pF. Strobe assertion forces all Y outputs low regardless of SELECT state, enabling synchronized channel blanking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing and battery-powered operation down to 2V. |
| tPD (Typ.) | 10ns at VCC = 6V - enables reliable operation in 50MHz+ digital control loops. |
| IOL / IOH | ≥4mA - drives standard TTL loads and multiple 74HC inputs without buffering. |
| ICC (Max) | 4µA at TA = 25°C - suitable for ultra-low-power standby modes in energy-sensitive systems. |
| VNIH / VNIL | ≥28% VCC - rejects >1.2V noise margin at 4.5V supply, improving noise resilience in noisy industrial environments. |
| Operating Temp | –55°C to +125°C - qualified for extended-temperature automotive and industrial control applications. |
| CIN | ≤10pF - minimizes capacitive loading on upstream drivers and preserves signal integrity. |
Pinout & Package
Package: Plastic DIP-16 (0.300" wide), JEDEC MS-001, body dimensions 20.0 × 8.5 × 3.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SELECT | Common 2:1 mux control: LOW selects A inputs, HIGH selects B inputs for all four channels. |
| 2,5,11,14 | 1A–4A | Data inputs from Source A; routed to Y outputs when SELECT = LOW and STROBE = LOW. |
| 3,6,10,13 | 1B–4B | Data inputs from Source B; routed to Y outputs when SELECT = HIGH and STROBE = LOW. |
| 4,7,9,12 | 1Y–4Y | Active-high multiplexed outputs; high-impedance state not supported - outputs go LOW when STROBE = HIGH. |
| 15 | STROBE | Active-HIGH enable: when HIGH, all Y outputs forced LOW regardless of SELECT or A/B states. |
| 8 | GND | Digital ground reference for logic thresholds and current return path. |
| 16 | VCC | Positive supply rail; decoupling capacitor required within 10mm for stable high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Output Drive | |IOH| = IOL ≥ 4mA ensures matched rise/fall times and consistent timing margins across logic transitions. |
| Balanced Propagation Delays | tPLH ≅ tPHL minimizes duty-cycle distortion in clock/data routing paths and simplifies timing analysis. |
| Wide Supply Range | 2V–6V operation allows direct interface with 3.3V microcontrollers and 5V legacy peripherals without level shifters. |
| High Noise Immunity | VNIH/VNIL ≥ 28% VCC provides >1.2V hysteresis margin at 4.5V, reducing false triggering in electrically noisy PLC cabinets. |
| ESD Protection | All inputs feature integrated protection circuits against static discharge and transient overvoltage per IEC 61000-4-2 Level 2. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Multiplexing sensor inputs (thermocouples, encoders) into a single ADC channel in modular PLC backplanes. IC Role / Device Role / Timing Role: Quad 2:1 data selector synchronizing analog front-end sampling with controller scan cycle via STROBE gating. Use Value: Reduces PCB layer count by consolidating four independent signal paths into one shared bus, lowering BOM cost and layout complexity. | Use Scenario: Switching between calibration references and DUT signals in automated test fixtures. IC Role / Device Role / Timing Role: High-speed signal path selector enabling rapid reconfiguration of measurement channels without FPGA intervention. Use Value: Achieves <10ns channel switching latency, supporting sub-100ns test step resolution and minimizing test time overhead. |
| Legacy Microcontroller Bus Interface | Automotive Body Control Module Logic |
Use Scenario: Expanding limited GPIO count on 8-bit MCUs (e.g., STM8S) to manage multiple LED banks or relay drivers. IC Role / Device Role / Timing Role: Level-shifting multiplexer bridging 3.3V MCU outputs to 5V-compatible peripheral control lines. Use Value: Eliminates need for discrete MOSFET translators while maintaining full 5V-tolerant input capability and 4mA drive strength. | Use Scenario: Selecting between redundant sensor inputs (e.g., dual HVAC temperature sensors) in body control units. IC Role / Device Role / Timing Role: Fail-safe data selector using STROBE to force known-safe output state during fault detection events. Use Value: Enables hardware-level fault masking without software polling, meeting ASIL-B diagnostic coverage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC157N | Same logic function and pinout; slightly higher ICC (8µA max) and lower noise immunity (VNIH/VNIL = 30% VCC min). | Rated only to +70°C ambient; unsuitable for under-hood or extended-temp industrial use. | Select when cost sensitivity outweighs extended temperature or ultra-low quiescent current needs. |
| 74VHC157N | Faster tPD (7.5ns typ at 5V); higher IOL/IOH (8mA); narrower VCC range (2V–5.5V). | Lacks guaranteed operation above 5.5V; incompatible with 6V supply rails or brown-out tolerant designs. | Prefer where speed is critical and supply is strictly regulated at 5V ±5%. |
Compared with SN74HC157N and 74VHC157N, the M74HC157B1R uniquely combines –55°C to +125°C operation, 4µA max ICC, and 6V absolute max supply-making it optimal for ruggedized embedded systems requiring long-term reliability under thermal stress and low-power constraints.
Availability
M74HC157B1R is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, digital test equipment signal routing, and legacy microcontroller bus interface applications requiring stable component supply and long-lifecycle support.
Supply support for M74HC157B1R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The M74HC157B1R belongs to ST's high-speed CMOS logic family, engineered for drop-in replacement of bipolar 74LS devices while delivering superior power efficiency, noise immunity, and extended temperature performance.
FAQ
Is M74HC157B1R compatible with 74LS157 sockets and timing?
Yes - M74HC157B1R is pin- and function-compatible with 74LS157, including identical DIP-16 footprint and truth table behavior. However, its CMOS inputs draw negligible current versus LS TTL inputs, eliminating the need for pull-up resistors on unused inputs and reducing board-level power consumption by >90%.
What happens to outputs when STROBE is HIGH?
When STROBE is HIGH, all four Y outputs are forced LOW regardless of SELECT state or A/B input values. This hard-wired disable function provides deterministic output behavior during reset, configuration, or fault conditions - no internal latching or metastability risk is present.
Can M74HC157B1R operate reliably at 2.0V supply?
Yes - the device is fully specified down to 2.0V, with guaranteed VOH ≥1.9V and VOL ≤0.1V at 20µA load, and tPD ≤150ns (max) across –55°C to +125°C. This enables use in coin-cell–powered diagnostics tools and ultra-low-voltage sensor nodes.
Does M74HC157B1R support hot insertion or live swapping?
No - the device lacks bus-hold or Ioff protection. Applying voltage to inputs while VCC is unpowered may cause latch-up or excessive ICC due to parasitic diode conduction. Always power VCC before applying input signals, and use series resistors if hot-swap operation is required.
M74HC157B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-DIP
M74HC157B1R FAQ
1.How can I place an order for M74HC157B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC157B1R 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 M74HC157B1R reliable?
The price and inventory of M74HC157B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC157B1R is usually 5 days.
3.What payment methods are accepted for M74HC157B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC157B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC157B1R?
M74HC157B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC157B1R 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 M74HC157B1R?
For technical support, including M74HC157B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC157B1R requirements.
6.How does Aetrix verify that M74HC157B1R is sourced from the original manufacturer or authorized distributors?
All M74HC157B1R 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 M74HC157B1R meets industry standards.
7.What is the process for return or replacement of M74HC157B1R?
All M74HC157B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC157B1R, 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 M74HC157B1R part is unused and in its original packaging.
Return procedure for M74HC157B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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