Texas Instruments SN74LVC157APWRE4

Overview

SN74LVC157APWRE4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer operating from 1.65V to 3.6V, with 16-pin TSSOP package, 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 in digital logic systems.

For engineers reviewing the SN74LVC157APWRE4 datasheet, SN74LVC157APWRE4 pinout, SN74LVC157APWRE4 application, or SN74LVC157APWRE4 equivalent, this page delivers verified electrical specs, functional mode details, real-world use cases, and validated alternative parts for mixed-voltage signal routing in industrial control, test equipment, and FPGA I/O expansion.

Technical Context

The SN74LVC157APWRE4 implements true (non-inverting) data selection across four parallel channels using a shared active-low output enable (G) and single address select (A/B). Each channel accepts two 5.5V-tolerant inputs (e.g., 1A/1B), selects one based on A/B state, and drives a dedicated CMOS output (e.g., 1Y).

Its logic operates within 1.65V–3.6V V_CC, supports 3.3V/5V mixed-signal interfacing, and features low ground bounce (<0.8V) and undershoot (>2V) at 3.3V - critical for noise-sensitive digital systems. All unused inputs must be tied to V_CC or GND to prevent floating states.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 6.4 mm body, 0.65 mm lead pitch, exposed thermal pad optional (not connected in PW variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC257APWRE4 and 74AHC157PW,118, the SN74LVC157APWRE4 uniquely balances 1.65V compatibility, 5.5V input tolerance, and sub-6ns speed - making it optimal for modern mixed-voltage embedded systems requiring deterministic low-latency selection without tri-state overhead.

Availability

SN74LVC157APWRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and FPGA configuration bus multiplexing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC157APWRE4 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 IC design.

The SN74LVC157APWRE4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interfacing in industrial, automotive, and communications equipment where power efficiency and noise resilience are critical.

FAQ

What is the maximum operating voltage for SN74LVC157APWRE4 inputs?

The SN74LVC157APWRE4 inputs tolerate up to 5.5V regardless of V_CC level - a key feature enabling safe interfacing with 5V peripherals while operating from 1.65V–3.6V supplies. This eliminates external level-shifting circuitry in mixed-voltage systems and is confirmed in Section 4.1 Absolute Maximum Ratings and Section 4.4 Recommended Operating Conditions of the official datasheet.

Does SN74LVC157APWRE4 support 1.8V logic levels?

Yes, SN74LVC157APWRE4 fully supports 1.8V operation: V_CC can be as low as 1.65V, and its input thresholds scale with V_CC (e.g., V_IL = 0.35×V_CC min at 1.65V–1.95V). At 1.8V supply, it delivers 5.5ns typical t_pd and ±4mA drive strength - verified in Table 4.9 Switching Characteristics and Table 4.7 Electrical Characteristics.

How does the G (strobe) pin function in SN74LVC157APWRE4?

The G pin on SN74LVC157APWRE4 is an active-low output strobe: when high, all four Y outputs are forced low (not high-impedance); when low, the selected inputs (1A/1B through 4A/4B) pass through to corresponding Y outputs based on A/B state. This differs from 3-state enable pins and is defined in the Function Table (Section 6.3) and Logic Diagram (Figure 6-1).

Can SN74LVC157APWRE4 replace SN74LS157 in existing designs?

SN74LVC157APWRE4 is not a direct drop-in replacement for SN74LS157 due to fundamental differences: LS uses bipolar TTL technology (5V-only, higher power, lower noise immunity), while LVC is CMOS (1.65V–3.6V, 5.5V-tolerant inputs, lower power). Board-level changes - including supply voltage, bypassing, and input termination - are required. No pin-compatible mapping exists between the two families.

What is the thermal resistance (R_θJA) of SN74LVC157APWRE4 in its TSSOP package?

The SN74LVC157APWRE4 in TSSOP-16 (PW) package has a junction-to-ambient thermal resistance (R_θJA) of 141.8°C/W, as specified in Section 4.5 Thermal Information. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with added copper pour or internal planes.