STMicroelectronics M74HC157RM13TR

Product Summary STMicroelectronics M74HC157RM13TR Multiplexer

The STMicroelectronics M74HC157RM13TR is a high-speed CMOS quad 2-channel digital multiplexer, designed for a wide range of electronic system applications. Housed in a compact 16-pin SO package, this device dramatically simplifies the selection between pairs of digital signals, making it ideal for logic routing in both consumer and industrial designs. The M74HC157RM13TR joins the STMicroelectronics HC family—a trusted lineup featuring robust performance, industry-standard pinouts, and direct functional compatibility with the classic 74 series 157 multiplexers.

Functional and Electrical Specifications of the M74HC157RM13TR

At the heart of the M74HC157RM13TR’s functionality are four independent 2-input multiplexers sharing common select and strobe controls, allowing seamless switching between data channels. When the strobe signal is high, all outputs are driven low, effectively disabling signal routing—a critical feature for system fault response and logic gating.

The device’s high-speed operation (typical propagation delay of 10 ns at 6V Vcc) supports demanding applications, while low static power consumption (maximum ICC of 4 μA at 25°C) ensures efficiency in both active and standby modes. Each output can source or sink a minimum of 4 mA, providing symmetrical drive capability to handle direct interfacing with standard logic circuits.

Input Configuration and Noise Tolerance of the M74HC157RM13TR

Inputs on the M74HC157RM13TR are safeguarded against electrostatic discharge and transient voltage, a vital consideration for system reliability. With noise immunity levels specified at 28%Vcc (minimum), the device maintains stable logic states in electrically noisy environments. This feature is crucial for high-integrity digital signal switching, especially in mixed-signal boards or environments with switching power supplies.

Timing Characteristics and Performance Benchmarks of the M74HC157RM13TR

The propagation delays for both high-to-low and low-to-high transitions are balanced (tPLH ≈ tPHL), facilitating predictable circuit timing and minimizing skew in synchronous systems. The device is rated for operation at clock rates up to 1 MHz under standard loading (50 pF), with well-defined waveform characteristics ensuring compatibility with leading-edge pulse generators.

The timing performance is further bolstered by low parasitic capacitance (CPD), minimizing charge/discharge delays and current spikes—a design consideration that assists in power budgeting and board-level signal integrity analysis.

Mechanical Specifications and Packaging Information for the M74HC157RM13TR

The M74HC157RM13TR comes in several package options, with the 16-pin SO package highlighted for its space-saving footprint. Mechanical data, including precise pin identification, pitch, and outline details, ensure straightforward PCB layout and automated assembly compatibility. The package’s thermal characteristics allow for continuous operation up to 65°C ambient, with enforced derating above this threshold, suiting the device for compact, densely populated boards.

Absolute Maximum Limits and Suggested Operational Conditions for the M74HC157RM13TR

To avoid device degradation or failure, engineers must observe the specified absolute maximum ratings—such as total power dissipation limits (500 mW at 65°C, derated by 10 mW/°C up to 85°C) and defined operational voltage range (2V to 6V Vcc). The recommended conditions guarantee optimal electrical performance and long-term reliability across the full spectrum of intended use cases.

Important Design Factors When Using the M74HC157RM13TR

When integrating the M74HC157RM13TR into system architectures, designers should review power budget, output drive capabilities, and logic voltage compatibility. The strobe and select line behaviors offer robust logic gating and signal selection, which can be employed in multiplexed busses, input selectors, or protocol switching. Proper attention to input protection and noise immunity is recommended for environments exposed to static or transient interference.

Alternative or Substitute Models for the M74HC157RM13TR

In scenarios requiring drop-in alternatives, the “74” series 157 multiplexers offer pin and function compatibility with the M74HC157RM13TR, ensuring seamless substitution. Other members of the STMicroelectronics HC family also serve as suitable replacements, provided they meet the voltage, timing, and mechanical specifications required by the target design. Cross-referencing datasheets can verify pin compatibility and electrical parameter equivalence for migration projects or supply contingency planning.

Conclusion

: M74HC157RM13TR as a versatile choice for system design

The STMicroelectronics M74HC157RM13TR stands out as a reliable, high-speed, and energy-efficient quad 2-channel multiplexer, tailored to meet the needs of modern electronic designs. With robust protection, tightly specified timing, and broad voltage compatibility, this device enables engineers and procurement specialists to implement flexible logic selection with confidence—supported by compatibility with legacy and contemporary system designs.