Nexperia USA Inc. 74HC257D,653

Overview

74HC257D,653 from Nexperia is a quad 2-input CMOS multiplexer with 3-state outputs in SO16 package, operating from 2.0 V to 6.0 V supply, supporting -40 °C to +125 °C ambient range, and delivering propagation delay as low as 10 ns at VCC = 6.0 V - used for bus-select logic in industrial control I/O expansion.

For engineers reviewing the 74HC257D,653 datasheet, 74HC257D,653 pinout, 74HC257D,653 application, or 74HC257D,653 equivalent, key selection criteria include 3-state output compatibility with shared data buses, TTL-level input tolerance (via 74HCT257 variant), and guaranteed operation across extended temperature ranges without derating below 110 °C.

Technical Context

This device integrates four independent 2:1 multiplexers sharing a common select line (S) and a single active-low 3-state output enable (OE), enabling synchronized channel routing and bus isolation. Each multiplexer drives one high-impedance output (1Y–4Y) with non-inverting data path and clamp diodes on all inputs for overvoltage protection.

It implements standard HC logic family characteristics: CMOS-level input thresholds for 74HC257 (VIH ≥ 3.15 V at VCC = 4.5 V), TTL-compatible inputs for 74HCT257 (VIH ≥ 2.0 V), and static drive capability of ±6.0 mA per output at VCC = 4.5 V with VOL ≤ 0.26 V and VOH ≥ 3.98 V.

Key Specifications

Pinout & Package

74HC257D,653 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC257D,653, the 74HCT257D,653 offers plug-compatible TTL input compatibility at no cost to timing or thermal performance, while SN74LV257APWR trades industrial temperature support for lower-voltage operation and reduced dynamic power - making each suitable for distinct voltage and environmental design constraints.

Availability

74HC257D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus multiplexing, and automotive body control modules requiring stable component supply across extended temperature ranges.

Supply support for 74HC257D,653 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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC/HCT257 series belongs to Nexperia's standard logic portfolio, designed specifically for robust signal routing in noise-prone industrial and automotive control systems where reliability across wide voltage and temperature ranges is mandatory.

FAQ

What is the maximum clock frequency supported by 74HC257D,653?

The device does not operate on a clock signal; it is combinatorial logic. Its usable data rate depends on propagation delay and load capacitance. With CL = 15 pF and VCC = 6.0 V, tpd = 10 ns (typ), supporting clean signal routing up to ~50 MHz toggle rate in point-to-point configurations. System-level timing must account for board trace delays and fanout.

Can 74HC257D,653 interface directly with 3.3 V microcontrollers?

Yes. At VCC = 3.3 V, VIH = 2.31 V (70% of VCC) and VIL = 0.99 V (30% of VCC) meet standard 3.3 V LVTTL/LVCMOS input thresholds. Output VOH = 3.15 V (min) and VOL = 0.26 V (max) at IO = ±6 mA ensure compatible drive strength and noise margins.

Is there a pin-compatible 74HC257 variant in TSSOP16 package?

Yes: 74HC257PW,653 uses the SOT403-1 (TSSOP16) package with identical pinout, electrical specs, and thermal rating (-40 °C to +125 °C). It has smaller footprint (4.4 mm body width) and lower thermal resistance (8.5 mW/K derating above 91 °C), suited for space-constrained designs.

Does 74HC257D,653 require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs (e.g., unconnected I0/I1 pins) must be tied to VCC or GND to prevent floating nodes that cause increased ICC and potential oscillation. The device lacks internal weak pull-ups/pull-downs; external termination is mandatory for deterministic logic states and EMI control.