Nexperia USA Inc. 74HCT157D/C5J

Overview

74HCT157D/C5J from Nexperia is a quad 2-input TTL-compatible multiplexer IC with active-low enable (E), common select (S), 16-pin SO16 package, −40 °C to +125 °C operating range, and propagation delay of 16–41 ns at VCC = 4.5 V. It routes four independent data pairs (1I0/1I1 through 4I0/4I1) to corresponding outputs (1Y–4Y) in digital control logic, bus selection, and address decoding circuits.

For engineers reviewing the 74HCT157D/C5J datasheet, 74HCT157D/C5J pinout, 74HCT157D/C5J application, or 74HCT157D/C5J equivalent, key selection criteria include TTL-level input compatibility, guaranteed operation up to +125 °C, SO16 thermal performance, and precise enable/select timing behavior under 50 pF load conditions.

Technical Context

The device implements four independent 2:1 multiplexers sharing one global select (S) and one active-low enable (E) input. When E is HIGH, all outputs (1Y–4Y) are forced LOW regardless of S or data inputs; when E is LOW, output nY reflects nI0 if S = LOW or nI1 if S = HIGH - non-inverting path with no internal inversion.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics confirm VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V, ensuring robust TTL-level signal recognition across industrial temperature extremes.

Key Specifications

Pinout & Package

74HCT157D/C5J uses the SOT109-1 plastic small outline package (SO16), 16-pin, 3.9 mm body width, with standard JEDEC MS-012 footprint and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC157D, the 74HCT157D/C5J delivers identical functionality with TTL-level input thresholds critical for mixed-technology systems; compared with SN74LS157N, it reduces supply current by >90%, extends temperature range to +125 °C, and improves propagation delay consistency across voltage and temperature.

Availability

74HCT157D/C5J is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT157D/C5J 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, reliable standard products including logic, discretes, MOSFETs, and ESD protection devices.

The 74HCT logic family was designed specifically to bridge TTL and CMOS domains, enabling seamless integration of legacy 5 V TTL systems with modern low-power CMOS architectures while maintaining industrial-grade reliability and temperature resilience.

FAQ

What is the maximum recommended supply voltage for 74HCT157D/C5J?

The absolute maximum supply voltage is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V per JEDEC JESD7A compliance. Operation above 5.5 V risks violating static and dynamic specifications, especially VIH/VIL thresholds and output drive strength, and may accelerate long-term parametric drift.

Can 74HCT157D/C5J drive a 50 pF capacitive load at 10 MHz?

Yes - with CL = 50 pF and f = 10 MHz, dynamic power is calculated as PD = CPD × VCC² × fi × N = 70 pF × (5 V)² × 10 MHz × 4 = 70 mW. This remains well below the SO16 package's 500 mW Ptot rating at +25 °C, and thermal derating (12.4 mW/K above 110 °C) still permits safe operation up to +125 °C ambient.

Is the enable (E) pin internally pulled up or down?

No internal pull-up or pull-down resistor exists on the E pin. It is a high-impedance CMOS input requiring explicit logic control. Leaving E floating risks undefined output states and increased susceptibility to noise-induced switching; design practice mandates connection to GND (to enable) or VCC (to disable) via MCU GPIO or hardwired logic.

Does 74HCT157D/C5J support hot insertion or live swapping?

No - the device lacks hot-swap protection circuitry such as power-on reset, I²C-style slew-rate control, or back-drive immunity. Applying VCC before establishing proper GND connection, or inserting/removing while powered, may cause latch-up or exceed absolute maximum ratings (e.g., VI > VCC + 0.5 V), risking permanent damage per JESD78 Class II Level B qualification limits.