Texas Instruments SN74AHC157PWRG3

Overview

SN74AHC157PWRG3 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in TSSOP-16 package, operating from 2 V to 5.5 V supply, delivering true (non-inverted) 4-bit word routing with active-low strobe control, and supporting industrial temperature range (–40°C to 125°C). It is used in digital logic consolidation, bus multiplexing, and address/data path selection in microcontroller peripheral interfaces.

For engineers reviewing the SN74AHC157PWRG3 datasheet, SN74AHC157PWRG3 pinout, SN74AHC157PWRG3 application, or SN74AHC157PWRG3 equivalent, key selection criteria include its 16-pin TSSOP footprint, 5.00 mm × 6.4 mm body size, guaranteed 7.5 ns max propagation delay at 5 V/15 pF, ±8 mA output drive, and ESD robustness per JESD22 (2000 V HBM).

Technical Context

The SN74AHC157PWRG3 implements four independent 2:1 multiplexer channels sharing a common active-low strobe (G) input: when G is high, all Y outputs are forced low; when G is low, the A/B select line determines whether inputs 1A–4A or 1B–4B are routed to outputs 1Y–4Y. Each channel provides true (non-inverting) output logic.

Its CMOS AHC-family architecture ensures rail-to-rail input thresholds (VIH = 3.85 V min at VCC = 5.5 V; VIL = 1.65 V max), low static current (ICC ≤ 40 µA at 5.5 V), and dynamic switching performance characterized at both 3.3 V ± 0.3 V and 5 V ± 0.5 V with CL = 15 pF and 50 pF loads.

Key Specifications

Pinout & Package

TSSOP-16 package (PW), 5.00 mm × 6.4 mm body size, 0.65 mm lead pitch, RoHS-compliant matte tin (SN) lead finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV157APWR and SN74AHC157D, SN74AHC157PWRG3 offers superior noise immunity via VCC-scaled thresholds, tighter propagation delay (7.5 ns vs. 12 ns), and optimized thermal performance in compact TSSOP packaging-making it preferred for high-reliability industrial signal routing.

Availability

SN74AHC157PWRG3 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and test instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74AHC157PWRG3 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 90 years of innovation in high-reliability components.

The SN74AHC157PWRG3 belongs to TI's advanced high-speed CMOS (AHC) logic family, designed specifically for low-power, high-noise-immunity digital signal routing in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum clock frequency supported by SN74AHC157PWRG3?

The SN74AHC157PWRG3 does not operate on a clock; it is a combinational logic device. Its usable data rate depends on propagation delay and system timing margins. With a maximum tPD of 7.5 ns at 5 V/15 pF, it supports reliable data switching up to approximately 66 MHz in well-designed paths with adequate setup/hold time. The SN74AHC157PWRG3 datasheet specifies no minimum pulse width, but practical use requires input stability for ≥1 ns before and after G or A/B transitions.

Does SN74AHC157PWRG3 support 3.3 V-only operation?

Yes, SN74AHC157PWRG3 is fully specified for 3.3 V operation (VCC = 3.3 V ± 0.3 V), with guaranteed parameters including 11.5 ns max propagation delay, ±4 mA output drive, and VIH = 2.1 V / VIL = 0.9 V. Its 2 V to 5.5 V range makes SN74AHC157PWRG3 ideal for mixed-voltage boards interfacing 3.3 V MCUs with 5 V peripherals.

Can SN74AHC157PWRG3 outputs be left floating?

No - SN74AHC157PWRG3 has push-pull (totem-pole) outputs with no high-impedance state. When strobe (G) is high, all outputs are actively driven low; when G is low, outputs always reflect selected inputs. Leaving outputs unconnected violates recommended practice and may cause EMI or crosstalk. Always terminate unused SN74AHC157PWRG3 outputs to known logic levels if not driving downstream loads.

What is the meaning of "G3" in SN74AHC157PWRG3?

The "G3" suffix in SN74AHC157PWRG3 denotes Texas Instruments' green packaging standard: matte tin (Sn) lead finish, halogen-free molding compound, and RoHS-compliant materials. It replaces older NiPdAu or Pb-based finishes and confirms compliance with JEDEC J-STD-020 moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH).

How does the strobe (G) pin affect output behavior in SN74AHC157PWRG3?

In SN74AHC157PWRG3, the strobe (G) pin is active-low: when G = HIGH, all four Y outputs are forced LOW regardless of A/B or data inputs; when G = LOW, the multiplexer functions normally, routing either A or B inputs to Y outputs based on the A/B select line. This enables synchronous enable/disable of all channels with a single control signal - critical for glitch-free bus switching.