Texas Instruments SN74HC157NSRG4

Overview

SN74HC157NSRG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SOP-16 package, operating from 2V to 6V supply, with 11ns typical propagation delay at 5V, ±6mA output drive, and low 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 selection and signal routing within industrial control logic.

For engineers reviewing the SN74HC157NSRG4 datasheet, SN74HC157NSRG4 pinout, SN74HC157NSRG4 application, or SN74HC157NSRG4 equivalent, key selection criteria include its 2–6V VCC range, guaranteed 15 LSTTL load drive capability, CMOS input compatibility with TTL-level thresholds, 1µA max input leakage, and SOP-16 thermal performance (RθJA = 64°C/W).

Technical Context

The SN74HC157NSRG4 implements four independent 2:1 multiplexers sharing one address select (A/B) and one 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 follows the selected input (A if A/B = L, B if A/B = H). All channels operate asynchronously with no internal clock or latch timing constraints.

It uses high-speed silicon-gate CMOS technology with TTL-compatible inputs-VIH(min) = 1.5V at VCC = 2V and 3.15V at VCC = 4.5V-enabling direct interfacing with legacy TTL logic. Input transition time limits (e.g., 400ns max at VCC = 6V) ensure stable switching and prevent oscillation due to slow edges.

Key Specifications

Pinout & Package

SOP-16 (NS) package: 6.20 mm × 5.30 mm body, 1.27 mm pitch, surface-mount, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV157A and SN74HC157D, the SN74HC157NSRG4 uniquely supports full 2–6V operation with verified 5V TTL compatibility, active production status in SOP-16, and MSL Level-1 reflow readiness-making it optimal for mixed-voltage industrial designs requiring long-term supply continuity.

Availability

SN74HC157NSRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus multiplexing, digital test equipment signal routing, and legacy system interface bridging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC157NSRG4 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 logic ICs.

The SN74HC157NSRG4 belongs to TI's HC logic family, designed for robust, low-power, wide-voltage digital signal routing in industrial automation, test instrumentation, and mixed-signal embedded systems.

FAQ

What is the maximum operating temperature for SN74HC157NSRG4?

The SN74HC157NSRG4 is rated for operation from –40°C to +85°C ambient temperature, as confirmed in TI's official packaging and orderable information. This range applies specifically to the NS (SOP-16) package variant and aligns with commercial-grade logic specifications. The device's thermal resistance (RθJA = 64°C/W) ensures safe junction temperatures under typical PCB layouts with standard copper pour.

Does SN74HC157NSRG4 support 3.3V-only operation?

Yes, SN74HC157NSRG4 fully supports 3.3V operation: VIH(min) = 2.0V and VIL(max) = 0.8V at VCC = 3.3V per TI's Recommended Operating Conditions, and output drive remains ±6mA. Its 2–6V VCC range guarantees correct logic thresholds and timing performance at 3.3V, making it suitable for modern low-voltage embedded systems without level-shifting circuitry.

Is SN74HC157NSRG4 pin-compatible with SN74HC157DRG4?

Yes, SN74HC157NSRG4 and SN74HC157DRG4 are pin-compatible: both use 16-pin packages (NS = SOP, D = SOIC) with identical pin functions, numbering, and mechanical footprint dimensions (6.20 × 5.30 mm for NS, 9.90 × 3.90 mm for D). They differ only in package type and thermal characteristics-not in logic behavior, pinout, or electrical interface.

What is the purpose of the G (strobe) pin on SN74HC157NSRG4?

The G pin on SN74HC157NSRG4 is an active-low strobe that forces all four Y outputs low regardless of A/B state or data inputs. This provides hardware-level output disable for bus isolation, conflict prevention, or power sequencing-eliminating the need for external gating logic or pull-down resistors during system reset or standby modes.

Can SN74HC157NSRG4 drive a 50pF capacitive load reliably?

Yes, SN74HC157NSRG4 is characterized and guaranteed to meet all specifications-including tpd ≤32ns and tt ≤15ns-at CL = 50pF, as documented in TI's Switching Characteristics tables. Driving larger loads increases propagation delay and transition time; for optimal timing margin in high-speed applications, keep total load ≤50pF using short traces and minimal fanout.