Texas Instruments SN74HC157PWRG4

Overview

SN74HC157PWRG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in TSSOP-16 package, operating from 2V to 6V supply, delivering 11ns typical propagation delay at 6V, ±6mA output drive at 5V, and 80µA max ICC. It routes four independent 2:1 data paths under shared A/B address and active-low strobe (G) control, used in digital bus switching and logic-level data routing.

For engineers reviewing the SN74HC157PWRG4 datasheet, SN74HC157PWRG4 pinout, SN74HC157PWRG4 application, or SN74HC157PWRG4 equivalent, key selection criteria include its 16-pin TSSOP footprint, guaranteed 2–6V operation, low-power CMOS compatibility, TTL-compatible input thresholds, and synchronous 4-channel enable/strobe behavior - all critical for legacy logic upgrades and space-constrained PCB designs.

Technical Context

The SN74HC157PWRG4 implements four independent 2:1 multiplexers sharing a common address select (A/B) and active-low strobe (G). When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Y output equals the selected input (A if A/B = L, B if A/B = H).

It uses high-speed silicon-gate CMOS technology with TTL-compatible inputs, enabling direct interfacing with both CMOS and legacy TTL logic families. Input leakage is ≤1µA max, output drive is ±6mA at 5V, and propagation delay is specified down to 11ns (typ) at VCC = 6V with CL = 50pF.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body size), lead-free, RoHS-compliant, moisture sensitivity level (MSL) 1, peak reflow 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT157PWR and 74LVC157PW,118, the SN74HC157PWRG4 uniquely balances wide supply range (2–6V), industry-standard TSSOP-16 pinout, and ultra-low ICC - making it the preferred choice for voltage-flexible upgrades and mixed-signal interface consolidation where pin compatibility and power efficiency are prioritized over maximum speed or 3.3V-only optimization.

Availability

SN74HC157PWRG4 is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, legacy logic upgrades, and microcontroller peripheral expansion requiring stable component supply across extended temperature and voltage ranges.

Supply support for SN74HC157PWRG4 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 decades of expertise in high-reliability logic families.

The SN74HC157PWRG4 belongs to TI's 74HC logic series, designed specifically for low-power, wide-supply-voltage digital signal routing in industrial, automotive, and communications equipment where pin compatibility and long-term availability are essential.

FAQ

What is the maximum clock/data rate supported by SN74HC157PWRG4?

The SN74HC157PWRG4 does not operate on a clock; it is asynchronous. Its maximum usable data rate is determined by propagation delay and load capacitance. With CL = 50pF and VCC = 6V, typical tpd is 11ns, supporting clean transitions up to ~25MHz in well-terminated digital paths. For CL = 150pF, tpd increases to 33ns, limiting practical use to ~15MHz.

Can SN74HC157PWRG4 interface directly with 3.3V microcontrollers?

Yes. The SN74HC157PWRG4 operates reliably from 2V to 6V, and its VIH(min) is 1.5V at VCC = 2V and 3.15V at VCC = 4.5V - fully compatible with standard 3.3V CMOS logic outputs. When powered at 3.3V, it delivers rail-to-rail outputs and draws <20µA ICC, making it ideal for mixed-voltage MCU interfaces.

Is SN74HC157PWRG4 pin-compatible with older 74LS157 devices?

Yes - SN74HC157PWRG4 shares identical pinout, function table, and logic behavior with 74LS157 in TSSOP-16 (PW) package. However, it requires no external pull-ups, consumes significantly less power, and supports wider supply voltage. No PCB changes are needed for direct replacement in most cases, though decoupling and input transition rates should be verified per TI's layout guidelines.

What is the role of the G (strobe) pin on SN74HC157PWRG4?

The G pin on SN74HC157PWRG4 is an active-low global enable/strobe. When G = HIGH, all four Y outputs are forced LOW regardless of A/B state or input values - providing hardware-level channel blanking. When G = LOW, the device operates normally, routing selected inputs to outputs. This enables synchronized bus disable and fault containment in multi-device systems.

Does SN74HC157PWRG4 require external pull-up resistors on unused inputs?

Yes. All unused inputs (A/B, G, 1A–4B) must be terminated to VCC or GND - floating CMOS inputs cause excessive current draw and potential oscillation. TI recommends 10kΩ pull-up or pull-down resistors for unconnected inputs. The SN74HC157PWRG4 has no internal termination; leaving any input floating violates recommended operating conditions and risks device malfunction.