Texas Instruments SN74LVC257AQPWREP

Overview

SN74LVC257AQPWREP from Texas Instruments is a radiation-hardened, quad 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for 2.7–3.6 V operation in extended-temperature aerospace and defense systems. It features 4.6 ns max propagation delay at 3.3 V, 5.5 V-tolerant inputs, and –40°C to 125°C operating range - enabling reliable signal routing in mixed-voltage bus architectures.

For engineers reviewing the SN74LVC257AQPWREP datasheet, SN74LVC257AQPWREP pinout, SN74LVC257AQPWREP application, or SN74LVC257AQPWREP equivalent, this device serves as a high-speed, low-voltage multiplexer for space-grade data path selection where input voltage translation, output isolation, and thermal robustness are critical design requirements.

Technical Context

The SN74LVC257AQPWREP implements four independent 2:1 multiplexers sharing a common 3-state output-enable (OE) control. Each channel selects between two inputs (A/B) based on the A/B select line, with outputs disabled to high-impedance when OE is high.

Its CMOS LVC logic family ensures rail-to-rail output swing, sub-0.8 V ground bounce (VOLP), and >2 V output undershoot immunity (VOHV) at 3.3 V. Inputs tolerate up to 5.5 V regardless of VCC, supporting seamless interfacing between 3.3 V logic and legacy 5 V peripherals.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC257AQDREP and SN74LVC257A-Q1, the SN74LVC257AQPWREP uniquely combines TSSOP-16 miniaturization, Q-temp qualification, and full QML-323 pedigree - making it the sole option for new space programs requiring radiation-hardened, high-density multiplexing.

Availability

SN74LVC257AQPWREP is available at Aetrix Electronics and suitable for avionics data routing, satellite onboard computer expansion, missile guidance sensor fusion, and spacecraft power management requiring stable component supply across extended temperature and radiation environments.

Supply support for SN74LVC257AQPWREP 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 high-reliability logic solutions for industrial, aerospace, and automotive markets.

The SN74LVC257AQPWREP belongs to TI's enhanced-product (EP) logic family, engineered specifically for mission-critical systems demanding extended temperature operation, controlled baseline manufacturing, and DMS support.

FAQ

What is the maximum input voltage rating for SN74LVC257AQPWREP?

The SN74LVC257AQPWREP accepts input voltages up to 5.5 V regardless of VCC level, enabling direct interfacing with 5 V logic families without external level-shifting components. This specification is guaranteed across the full –40°C to 125°C operating range and is validated per the absolute maximum ratings table in the SCAS736B datasheet.

Does SN74LVC257AQPWREP support hot insertion or live bus operation?

SN74LVC257AQPWREP does not include built-in hot-swap protection, but its 3-state outputs and high-impedance disable mode allow safe insertion into powered buses when OE is held high during insertion. TI recommends tying OE to VCC via a pullup resistor to ensure outputs remain disabled until system initialization completes - preventing bus contention during power-up sequences.

How does the A/B select line function across all four channels of SN74LVC257AQPWREP?

The A/B pin is a global select line shared across all four 2:1 multiplexers in SN74LVC257AQPWREP. When A/B = LOW, inputs 1A–4A are routed to outputs 1Y–4Y; when A/B = HIGH, inputs 1B–4B are selected instead. This synchronized selection simplifies control logic in applications requiring consistent channel pairing, such as parallel data path redundancy.

What is the thermal resistance (θJA) of the SN74LVC257AQPWREP in its TSSOP-16 package?

The SN74LVC257AQPWREP in the TSSOP-16 (PW) package has a junction-to-ambient thermal resistance (θJA) of 108°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC test conditions (1-layer board, 1 in² copper pad) and informs thermal design margins for continuous operation at maximum load within the –40°C to 125°C ambient range.

Is SN74LVC257AQPWREP pin-compatible with commercial-grade SN74LVC257A variants?

Yes, SN74LVC257AQPWREP is pin-compatible with all TSSOP-16 versions of the SN74LVC257A family, including SN74LVC257A and SN74LVC257A-Q1. The pinout, footprint, and signal assignments match exactly - allowing drop-in replacement in existing layouts when upgrading to the enhanced-product (EP) variant for extended temperature or reliability requirements.