Texas Instruments SN74LV157APWT

Overview

SN74LV157APWT from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer IC operating from 2 V to 5.5 V, with 7.5 ns max propagation delay at 5 V, 5.0 mm × 4.4 mm TSSOP-16 package, and input tolerance up to 5.5 V - used for signal routing in LED display column drivers and network switch I/O expansion.

For engineers reviewing the SN74LV157APWT datasheet, SN74LV157APWT pinout, SN74LV157APWT application, or SN74LV157APWT equivalent, key selection criteria include supply voltage range (2–5.5 V), output drive capability (±12 mA at 5 V), ground bounce performance (<0.8 V), latch-up immunity (>100 mA), and compatibility with mixed-voltage logic systems.

Technical Context

The SN74LV157APWT implements four independent 2:1 multiplexers with a common active-low strobe (G) and shared address select (A/B) control line. Each channel routes either input A or B to its corresponding Y output based on the A/B state, while G enables or disables all outputs simultaneously into high-impedance.

It uses LVCMOS-compatible input thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC), supports true (non-inverted) data path operation, and features robust noise immunity with dynamic VIH(D) ≥ 2.31 V and VIL(D) ≤ 0.99 V at 3.3 V supply - critical for reliable switching in noisy telecom infrastructure backplanes.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC157APW and 74AHC157PW, the SN74LV157APWT uniquely balances wide supply range, 5.5 V-tolerant inputs, and industrial temperature support - making it optimal for mixed-voltage telecom and industrial control designs where robustness outweighs marginal speed gains.

Availability

SN74LV157APWT is available at Aetrix Electronics and suitable for LED display column drivers, network switch I/O expanders, and telecom line card interfaces requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74LV157APWT 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 global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability interface ICs.

The SN74LV157A product line delivers low-voltage, high-noise-immunity multiplexers optimized for industrial automation, communications infrastructure, and display subsystems where mixed-supply interoperability and latch-up robustness are critical.

FAQ

What is the maximum propagation delay of the SN74LV157APWT at 3.3 V supply?

The SN74LV157APWT has a maximum propagation delay (tpd) of 9.5 ns at VCC = 3.3 V ± 0.3 V with 15 pF load, as specified in Section 6.7 of the datasheet. This value ensures reliable timing in 3.3 V digital systems such as network switch control planes and LED display controllers where sub-10 ns routing latency is required.

Does the SN74LV157APWT support 5 V input signals when powered from a 2.5 V supply?

Yes, the SN74LV157APWT accepts input voltages up to 5.5 V regardless of VCC level - confirmed in Section 1 Features and Section 6.1 Absolute Maximum Ratings. This 5.5 V-tolerant input capability allows direct interfacing with 5 V sensors or legacy peripherals while operating from a 2.5 V rail, eliminating level-shifter components in mixed-voltage designs.

What is the function of the G pin on the SN74LV157APWT?

The G pin (Pin 15) is the active-low output strobe for the SN74LV157APWT. When G = HIGH, all four Y outputs enter high-impedance state; when G = LOW, outputs reflect the selected A/B inputs. This enables bus sharing and safe hot-swap operation - critical in modular telecom line cards and industrial I/O expansion modules where signal contention must be avoided.

What package type does the SN74LV157APWT use, and what are its dimensions?

The SN74LV157APWT uses a TSSOP-16 (PW) package measuring 5.0 mm × 4.4 mm with 0.65 mm lead pitch and 1.2 mm maximum height, per JEDEC MO-153. This compact footprint supports high-density PCB layouts in space-constrained applications like LED display driver boards and small-form-factor network switches.

How does the SN74LV157APWT handle ground bounce during fast switching?

The SN74LV157APWT limits typical output ground bounce (VOLP) to <0.8 V at VCC = 5 V and TA = 25°C, as stated in Section 1 Features. This low VOLP value reduces simultaneous switching noise, easing EMI compliance and signal integrity in high-speed LED column drivers and telecom backplane interfaces where multiple outputs switch synchronously.