Nexperia USA Inc. 74HCT257PW-Q100J

Overview

74HCT257PW-Q100 from Nexperia is an automotive-qualified quad 2-input multiplexer with 3-state outputs, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), operating from −40 °C to +125 °C, and housed in a TSSOP16 package (SOT403-1). It enables selective routing of four independent data pairs onto shared bus lines in engine control units, ADAS sensor interfaces, and body electronics.

For engineers reviewing the 74HCT257PW-Q100 datasheet, 74HCT257PW-Q100 pinout, 74HCT257PW-Q100 application, or 74HCT257PW-Q100 equivalent, this page delivers verified functional behavior, AEC-Q100 Grade 1 qualification status, propagation delay (tpd = 16 ns typ @ VCC = 4.5 V), 3-state enable timing (ten = 15 ns typ), and precise pin-level circuit roles for bus arbitration and signal selection.

Technical Context

This device implements four independent 2:1 multiplexers sharing a common select line (S) and a single active-low 3-state output enable (OE). Each multiplexer routes either I0 or I1 to its Y output based on S logic level, with non-inverting data path and CMOS-compatible output drive.

All inputs feature clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The 3-state outputs directly interface with system buses without external pull-ups or level shifters, supporting bidirectional bus architectures in automotive microcontroller peripherals.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin, 4.4 mm body width, 0.65 mm pitch; optimized for high-density automotive PCB layouts with improved thermal derating (8.5 mW/K above 91 °C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input multiplexer applications.

Compared with 74HCT257PW-Q100, the SO16 variant trades board space for thermal margin and manufacturability, while the TI alternative sacrifices full Grade 1 qualification for alternate logistics - making the Nexperia TSSOP version optimal for space-constrained, high-reliability powertrain and chassis modules.

Availability

74HCT257PW-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor fusion modules, and body control modules requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for 74HCT257PW-Q100 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

This device belongs to Nexperia's automotive logic portfolio, engineered specifically for AEC-Q100-compliant signal routing in harsh-environment electronic control units where deterministic timing, bus compatibility, and thermal resilience are mandatory.

FAQ

What is the maximum clock frequency supported by the 74HCT257PW-Q100 for reliable multiplexing?

The device does not operate on a clock; it is combinatorial logic. Its usable signal switching rate is determined by propagation delay (16 ns typ) and transition time (5 ns typ), supporting clean data routing up to approximately 30 MHz for repetitive toggling under loaded conditions. System-level timing must account for worst-case tpd (45 ns max at −40 °C to +125 °C) and bus settling.

Can the 74HCT257PW-Q100 interface directly with 3.3 V microcontrollers?

No - its TTL-compatible inputs require VIH ≥ 2.0 V, which 3.3 V logic satisfies, but its outputs swing to VCC (4.5–5.5 V), risking damage to 3.3 V receivers. A level-shifting buffer or resistor-divider network is required on Y outputs when driving 3.3 V inputs, unless the receiving device explicitly tolerates 5 V inputs.

How does the clamp diode protection work on the inputs?

Each input has integrated diodes to VCC and GND. When an input voltage exceeds VCC + 0.5 V, the upper diode conducts, diverting excess current through an external series resistor into VCC. Similarly, voltages below GND − 0.5 V activate the lower diode. This allows safe interfacing with sensors or signals operating at up to 6 V in 5 V systems.

Is there any difference in functionality between the 74HC257PW-Q100 and 74HCT257PW-Q100 variants?

Yes - the HC version uses CMOS input thresholds (VIH ≈ 0.7×VCC), while the HCT version uses fixed TTL thresholds (VIH = 2.0 V min). At VCC = 5 V, both behave similarly, but the HCT variant ensures compatibility with older 5 V TTL outputs that may not reach 3.5 V logic HIGH, making it preferred for legacy automotive MCU interfaces.