Nexperia USA Inc. 74HCT257PW,112

Overview

74HCT257PW,112 from Nexperia is a quad 2-input multiplexer with 3-state outputs, designed for bus-oriented data routing in digital logic systems. It features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), operates from 4.5 V to 5.5 V, delivers propagation delay as low as 13 ns (VCC = 4.5 V, CL = 15 pF), and supports industrial temperature range (−40 °C to +125 °C) in TSSOP16 package.

For engineers reviewing the 74HCT257PW,112 datasheet, 74HCT257PW,112 pinout, 74HCT257PW,112 application, or 74HCT257PW,112 equivalent, key selection considerations include its 3-state bus interface capability, TTL-level input compatibility, guaranteed timing performance across full temperature range, and TSSOP16 footprint suitability for high-density PCB layouts.

Technical Context

The 74HCT257PW,112 implements four independent 2:1 multiplexers sharing a common select (S) and active-low output enable (OE) control. Each multiplexer routes either I0 or I1 to its corresponding Y output based on S state, while OE independently places all Y outputs in high-impedance mode - enabling direct connection to shared data buses without external isolation.

Its TTL-compatible inputs accept standard 5 V logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), ensuring seamless interfacing with legacy 74LS/74ALS families. The device uses silicon-gate CMOS technology, delivering rail-to-rail output swing (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±6 mA) and low static current (ICC ≤ 8 μA typical at VCC = 5.5 V).

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin, 4.4 mm body width, 0.65 mm lead pitch; RoHS-compliant, halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT257PWR and 74HCT257D,118, the 74HCT257PW,112 offers optimal density for automated SMT lines, identical electrical behavior to the SO16 version, and superior thermal performance over the TI alternative in space-constrained industrial enclosures.

Availability

74HCT257PW,112 is available at Aetrix Electronics and suitable for microcontroller bus expansion, digital signal routing, industrial I/O multiplexing, and legacy system interface applications requiring stable component supply across extended temperature ranges.

Supply support for 74HCT257PW,112 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 leading Dutch semiconductor manufacturer specializing in high-volume logic, analog, and discrete components, with global manufacturing and R&D centers.

The 74HCT series targets robust, pin-compatible replacements for legacy TTL logic in industrial and automotive applications - emphasizing noise immunity, wide operating margins, and long-term supply stability.

FAQ

Can 74HCT257PW,112 operate at 3.3 V?

No. The 74HCT257PW,112 is specified only for 4.5 V to 5.5 V supply operation. Its TTL-compatible inputs require minimum 2.0 V VIH, which cannot be reliably met below 4.5 V. For 3.3 V systems, use the 74HC257 variant instead, which has CMOS-level inputs and 2.0 V to 6.0 V supply range.

What is the maximum capacitive load the outputs can drive?

The outputs are characterized up to 50 pF load capacitance in the datasheet (Fig. 7 test condition). While not explicitly rated beyond that, sustained operation with >50 pF may increase propagation delay and transition time - verify timing margins in final layout using worst-case CL = 75 pF in simulation if driving long traces or multiple inputs.

Is there a risk of bus contention when OE is toggled asynchronously?

Yes. If OE transitions while S is changing or inputs are unstable, momentary glitches may appear on Y outputs. To prevent contention, ensure OE remains LOW during S transitions and stabilize all inputs before asserting OE HIGH. Use synchronous control (e.g., clocked OE enable) in high-reliability systems.

Does the device support hot insertion?

No. The 74HCT257PW,112 lacks hot-swap protection circuitry. Applying VCC or signals before GND is established risks latch-up or ESD damage. Always power GND first, then VCC, then apply inputs - follow strict power sequencing in backplane or modular systems.