Nexperia USA Inc. 74HC257DB,112

Overview

74HC257DB,112 from Nexperia is a quad 2-input CMOS multiplexer with 3-state outputs, designed for data routing and bus interface in digital logic systems. It operates across 2.0 V to 6.0 V supply, features non-inverting signal paths, supports -40 °C to +125 °C ambient range, and integrates input clamp diodes enabling overvoltage-tolerant interfacing-commonly used in industrial control I/O expansion and legacy TTL/CMOS bus arbitration.

For engineers reviewing the 74HC257DB,112 datasheet, 74HC257DB,112 pinout, 74HC257DB,112 application, or 74HC257DB,112 equivalent, key selection criteria include its 3-state output drive capability (±6 mA at VCC = 4.5 V), propagation delay of 13 ns (typical, VCC = 4.5 V), input level compatibility (CMOS), and SO16 package thermal derating profile.

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 state, with all outputs placed in high-impedance when OE is HIGH.

Its static input thresholds (VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V) and dynamic timing (tpd = 13 ns typ, ten/tdis = 12–15 ns typ) are optimized for mixed-voltage system interfacing while maintaining low ICC (8 μA typ, VCC = 6.0 V) and high noise immunity per JESD7A compliance.

Key Specifications

Pinout & Package

74HC257DB,112 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant. Pin 1 index marked, gull-wing leads, RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC257DB,112, the 74HC257D,653 offers identical performance in a production-ready reel format, while SN74HC257N trades surface-mount reliability and speed for through-hole convenience-making DB,112 optimal for industrial SMT deployments requiring thermal stability and ESD resilience.

Availability

74HC257DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment signal routing, and legacy system bus arbitration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC257DB,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 global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with focus on efficiency, miniaturization, and robustness for industrial and automotive markets.

The 74HC257 belongs to Nexperia's HC logic family-designed specifically for low-power, high-noise-immunity digital interfacing in harsh environments where wide VCC tolerance and latch-up resistance are critical.

FAQ

What is the maximum clock frequency supported by 74HC257DB,112?

The device does not operate on a clock; it is combinatorial. Its usable data rate depends on propagation delay and load. With tpd = 13 ns (typical, VCC = 4.5 V, CL = 15 pF), it supports reliable switching up to ~30 MHz in well-terminated systems, assuming setup/hold times are met by upstream logic.

Can 74HC257DB,112 interface directly with 3.3 V microcontrollers?

Yes. At VCC = 3.3 V, VIH(min) = 2.1 V and VIL(max) = 1.2 V per datasheet Table 6, fully compatible with standard 3.3 V CMOS logic levels. Outputs swing rail-to-rail (VOH ≈ 3.3 V, VOL ≈ 0 V), ensuring noise margin >0.7 V.

Is the 74HC257DB,112 pin-compatible with 74HCT257 variants?

Yes-identical pinout and function. The key difference is input threshold: 74HC257 uses CMOS-level inputs (VIH ≈ 0.7×VCC), while 74HCT257 uses TTL-level inputs (VIH = 2.0 V min). Swapping requires verifying source logic family compatibility.

Does this part support hot insertion or live bus swapping?

No. While input clamp diodes allow limited overvoltage tolerance, the device lacks hot-swap protection circuitry (e.g., slew-rate control, back-drive prevention). OE must be asserted HIGH before connecting/disconnecting to avoid bus contention or latch-up risk.