Texas Instruments SN74LVC157APWG4

Overview

SN74LVC157APWG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin TSSOP package, operating from 1.65V to 3.6V supply, with 5.2ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and –40°C to 125°C temperature range. It routes four independent 2:1 data paths under common address (A/B) and strobe (G) control, used in bus multiplexing, signal routing, and level translation in mixed-voltage digital systems.

For engineers reviewing the SN74LVC157APWG4 datasheet, SN74LVC157APWG4 pinout, SN74LVC157APWG4 application, or SN74LVC157APWG4 equivalent, key selection criteria include its 16-pin TSSOP footprint, 3.3V-compatible switching performance, input voltage tolerance up to 5.5V, guaranteed operation across industrial and extended temperature ranges, and compatibility with LVC logic families in high-density PCB layouts.

Technical Context

The SN74LVC157APWG4 implements four independent 2:1 multiplexers sharing one address select (A/B) and one active-low output enable (G). When G is high, all Y outputs are forced low; when G is low, each Yn selects between An and Bn based on A/B state. Its CMOS design supports bidirectional voltage translation: 5V-tolerant inputs allow interfacing with legacy 5V logic while driving 3.3V LVC loads.

Propagation delay is specified down to 1.8V supply (max 15.5ns), with typical output ground bounce <0.8V and VOH undershoot >2V at 3.3V - critical for noise-sensitive mixed-signal environments. Latch-up immunity exceeds 250mA per JESD17, and ESD protection meets ±2000V HBM and ±1000V CDM standards.

Key Specifications

Pinout & Package

SN74LVC157APWG4 uses a 16-pin Thin Shrink Small Outline Package (TSSOP), 5.00 mm × 6.4 mm body size, with 0.65 mm lead pitch. Thermal pad is not present; pins are gull-wing surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC257APW and 74LVC157PW,118, the SN74LVC157APWG4 offers superior long-term supply stability, tighter propagation delay specification, and explicit validation across –40°C to 125°C - making it the preferred choice for automotive and industrial applications demanding lifecycle assurance and timing predictability.

Availability

SN74LVC157APWG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical data acquisition systems requiring stable component supply, extended temperature operation, and RoHS-compliant packaging.

Supply support for SN74LVC157APWG4 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 and automotive-grade qualification.

The SN74LVC157APWG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for low-voltage, high-speed, mixed-voltage digital interface applications in space-constrained, thermally demanding environments.

FAQ

What is the maximum operating frequency supported by SN74LVC157APWG4?

The SN74LVC157APWG4 does not specify a maximum clock frequency, but its 5.2ns max propagation delay at 3.3V implies reliable operation up to approximately 100MHz for data routing tasks. Actual usable frequency depends on system-level timing margins, load capacitance, and board layout - TI recommends verifying setup/hold times using the device's published switching characteristics tables for your specific VCC and temperature conditions. The SN74LVC157APWG4 is optimized for asynchronous data selection, not synchronous clocking.

Can SN74LVC157APWG4 interface directly with 5V logic outputs?

Yes, the SN74LVC157APWG4 features 5.5V-tolerant inputs, allowing direct connection to 5V TTL or CMOS outputs without level-shifting circuitry. Inputs remain functional and protected across the full 0–5.5V range regardless of VCC (1.65–3.6V). This capability is explicitly validated in TI's datasheet Section 4.4 and makes the SN74LVC157APWG4 ideal for bridging legacy 5V subsystems with modern 3.3V microcontrollers.

What is the function of the G pin on SN74LVC157APWG4?

The G pin (Pin 15) is the active-low output strobe. When G = high, all four Y outputs (1Y–4Y) are forced low, overriding the A/B select and data inputs. When G = low, the device operates normally: each Yn outputs either An or Bn based on the A/B address state. This enables global output disable for bus contention avoidance or power gating - a key feature distinguishing the SN74LVC157APWG4 from non-strobed multiplexers like the SN74LVC257.

Is SN74LVC157APWG4 suitable for automotive applications?

Yes, the SN74LVC157APWG4 is rated for operation from –40°C to 125°C and carries TI's automotive qualification documentation. Its 250mA latch-up immunity, ±2000V HBM ESD rating, and robust input clamping make it suitable for body control modules, infotainment interfaces, and ADAS sensor hubs. While not AEC-Q200 certified as a standalone component, it meets the electrical and thermal requirements of many Tier-1 automotive subsystems when used per TI's recommended layout and decoupling guidelines.

What decoupling capacitor value is recommended for SN74LVC157APWG4?

Texas Instruments recommends a 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 16) of the SN74LVC157APWG4. For boards with multiple VCC connections or high-noise environments, paralleling a 1µF capacitor is acceptable to suppress lower-frequency ripple. The 0.1µF value targets high-frequency switching noise generated during output transitions, and placement proximity is critical to minimize inductance in the decoupling loop - TI's layout example (Figure 7-1) shows this capacitor mounted directly adjacent to Pin 16.