STMicroelectronics 74LVQ157TTR

Overview

74LVQ157TTR from STMicroelectronics is a low-voltage CMOS quad 2-channel multiplexer with pin- and function-compatibility to 74-series 157 logic. It operates from 2.0 V to 3.6 V, delivers symmetrical 12 mA output drive (|IOH| = IOL), achieves 7 ns typical propagation delay at 3.3 V, and features 75 Ω transmission-line drive capability-ideal for noise-sensitive 3.3 V data routing in industrial control backplanes.

For engineers reviewing the 74LVQ157TTR datasheet, 74LVQ157TTR pinout, 74LVQ157TTR application, or 74LVQ157TTR equivalent, key selection criteria include its balanced tPLH/tPHL delays, 2 kV ESD immunity, PCI bus-level 24 mA drive guarantee, and true 1.2 V data retention under brownout conditions.

Technical Context

The device implements four independent 2:1 digital multiplexers sharing common SELECT and STROBE inputs, with active-low STROBE enabling full output disable (all Y outputs forced low). Its C2MOS sub-micron silicon gate process ensures latch-up immunity and low dynamic noise (VOLP = 0.2 V typ. at 3.3 V).

All inputs and outputs integrate protection diodes for ±2 kV HBM ESD robustness. The symmetrical output impedance and guaranteed 75 Ω line drive support clean signal integrity on controlled-impedance PCB traces without external termination.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, thin-profile surface-mount construction suitable for high-density PCBs and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV4052AIPWR and 74LVC157PW,118, the 74LVQ157TTR uniquely combines 75 Ω line drive, 2 kV ESD, and sub-1 ns output skew-making it the only choice for deterministic, low-noise digital multiplexing in mission-critical industrial and automotive signal routing.

Availability

74LVQ157TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, medical patient monitor interfaces, and automated test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for 74LVQ157TTR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad IP portfolio.

The 74LVQ series targets low-voltage, low-noise 3.3 V logic applications requiring enhanced ESD robustness and transmission-line compatibility-designed specifically for industrial control, medical instrumentation, and automotive subsystems.

FAQ

Is the 74LVQ157TTR pin-compatible with standard 74HC157 or 74LS157?

Yes, it is pin- and function-compatible with 74-series 157 devices, including 74HC157 and 74LS157, using identical TSSOP-16 footprint and truth table. However, it operates only from 2.0–3.6 V-not 5 V-so direct 5 V system replacement requires voltage translation or redesign.

Does the STROBE input provide true high-impedance (tri-state) outputs?

No. When STROBE = HIGH, all Y outputs are actively driven LOW-not placed in high-impedance state. This is a hard-wired disable behavior, distinct from tri-state buffers. For true Z-state control, a separate bus buffer like 74LVCH16245 must be used downstream.

What is the significance of "1.2 V data retention" in the operating conditions?

At VCC ≥ 1.2 V, internal logic states (including SELECT and STROBE latching) remain valid even during brownout or partial power loss-enabling graceful shutdown or wake-up sequencing in safety-critical systems without data corruption.

Can the 74LVQ157TTR drive a 50 Ω coaxial cable directly?

No. Its 75 Ω transmission-line drive capability is optimized for FR-4 PCB traces with ~75 Ω characteristic impedance-not 50 Ω coax. Driving 50 Ω loads risks undershoot and reflection; use a dedicated line driver (e.g., SN65LVDS1) for coaxial interfaces.