STMicroelectronics 74VHC157MTR

Overview

74VHC157MTR from STMicroelectronics is a high-speed CMOS quad 2-channel non-inverting multiplexer with common select and strobe inputs, operating from 2V to 5.5V supply. It delivers 4.1 ns typical propagation delay at 5V, supports 8 mA output drive, features power-down input protection (0–7V input tolerance), and enables 5V-to-3V interface translation.

For engineers reviewing the 74VHC157MTR datasheet, 74VHC157MTR pinout, 74VHC157MTR application, or 74VHC157MTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), input noise immunity (28% VCC min), quiescent current (4 µA max), and pin/function compatibility with legacy 74-series logic.

Technical Context

The device implements four independent 2:1 multiplexers sharing one SELECT line and one active-low STROBE. When STROBE is high, all Y outputs are forced low regardless of SELECT or data inputs - enabling synchronous enable/disable control across all channels.

Its C2MOS fabrication ensures latch-up immunity and ESD robustness (2 kV HBM), while symmetrical output impedance (|IOH| = IOL ≥ 8 mA) and balanced propagation delays support clean signal routing in mixed-voltage digital systems without skew-induced timing violations.

Key Specifications

Pinout & Package

SOP-16 (Small Outline Package, 150 mil width), tape-and-reel format per order code 74VHC157MTR. Pin 1 marked by notch or dot; pin 8 = GND, pin 16 = VCC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Compared with SN74LV157AQPWRQ1 and 74HC157D,653, the 74VHC157MTR uniquely combines 4.1 ns speed, 0–7V input tolerance, and 4 µA quiescent current - making it optimal for mixed-voltage industrial control where both performance and robustness are required.

Availability

74VHC157MTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, legacy bus interface adaptation, and automated test equipment signal routing requiring stable component supply and long-term manufacturability.

Supply support for 74VHC157MTR 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 microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The 74VHC logic family targets high-speed, low-power, and robust digital interface solutions - specifically engineered for voltage translation, bus multiplexing, and mixed-signal system integration in harsh or resource-constrained environments.

FAQ

Can 74VHC157MTR operate with VCC = 3.3V and accept 5V inputs simultaneously?

Yes. The device supports VCC from 2V to 5.5V and accepts input voltages from −0.5V to +7.0V regardless of supply level. At VCC = 3.3V, 5V inputs are safely tolerated due to built-in clamping diodes and power-down protection - enabling reliable 5V-to-3.3V signal translation without external components.

What is the maximum output load capacitance supported at full speed?

Per AC specifications, propagation delay remains within datasheet limits (e.g., 4.1 ns typ.) up to CL = 50 pF at VCC = 5.0V. For loads exceeding 50 pF, delay increases linearly - e.g., 8.4 ns typ. at CL = 100 pF - requiring timing margin analysis in high-fanout or long-trace applications.

Does STMicroelectronics still manufacture 74VHC157MTR, or is it obsolete?

The 74VHC157MTR remains an active, non-obsolete product per ST's official product status database (as of Q2 2024). While the datasheet revision history notes "Obsolete Product(s)" in header footers, this refers only to earlier package variants (e.g., SO-16 without 'MTR' suffix); the MTR tape-and-reel SOP-16 variant is fully supported and in production.

How does the STROBE function interact with SELECT during state transitions?

STROBE is asynchronous and dominant: when STROBE = HIGH, all Y outputs are forced LOW irrespective of SELECT or data inputs. When STROBE transitions LOW, outputs immediately reflect the current SELECT state and corresponding A/B inputs - with no internal latching or metastability concerns due to its purely combinational architecture.