Nexperia USA Inc. 74HCT27PW,118

Overview

74HCT27PW,118 from Nexperia is a triple 3-input NOR gate logic IC with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), 14-pin TSSOP package, -40 °C to +125 °C operating range, and propagation delay of 12 ns (typ) at VCC = 4.5 V. It serves as a discrete combinational logic building block in digital control subsystems requiring level-shifted interface between legacy TTL and modern CMOS domains.

For engineers reviewing the 74HCT27PW,118 datasheet, 74HCT27PW,118 pinout, 74HCT27PW,118 application, or 74HCT27PW,118 equivalent, key selection criteria include input voltage compatibility with 5 V TTL sources, guaranteed operation up to +125 °C, low static current (<2 μA at 25 °C), output drive capability (±4 mA), and TSSOP-14 thermal performance under sustained switching loads.

Technical Context

This device implements three independent 3-input NOR gates using silicon-gate CMOS technology with buffered outputs and integrated input clamp diodes for overvoltage tolerance. Each gate exhibits symmetrical HIGH/LOW output voltage specifications (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±4 mA, VCC = 4.5 V) and defined transition thresholds aligned to TTL logic families.

Its functional behavior follows standard Boolean NOR logic: output is HIGH only when all three inputs are LOW; otherwise, output is LOW. Input clamping enables safe interfacing with signals exceeding VCC when used with external current-limiting resistors, and latch-up immunity exceeds 100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1); 14 leads; body width 4.4 mm; 0.65 mm lead pitch; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input NOR gate applications.

Compared with SN74HCT27N, 74HCT27PW,118 offers superior thermal performance and tighter timing in SMT production; versus 74LVC27PW, it provides guaranteed TTL compatibility and higher noise immunity at 5 V, at the cost of ~3× propagation delay.

Availability

74HCT27PW,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive HVAC control logic, and power sequencing supervisor circuits requiring stable component supply across extended temperature ranges and high-volume manufacturing.

Supply support for 74HCT27PW,118 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 logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74HCT series targets industrial and automotive auxiliary systems needing robust 5 V TTL-compatible logic with extended temperature operation and proven latch-up immunity.

FAQ

Can 74HCT27PW,118 operate reliably at 4.2 V supply?

No. The 74HCT27PW,118 is specified only for 4.5 V to 5.5 V operation per JEDEC JESD7A. At 4.2 V, VIH minimum (2.0 V) remains met, but VOH drops below 3.5 V and noise margins degrade significantly; worst-case propagation delay increases beyond 25 ns, risking timing violations in synchronous designs.

Does this device support hot-swap insertion?

No. The 74HCT27PW,118 lacks hot-swap protection circuitry. Applying VCC before GND or sequencing inputs before supply stabilization may cause latch-up or excessive current flow due to internal parasitic structures. Power must be applied monotonically with GND established first.

What is the maximum capacitive load per output?

The datasheet specifies CL = 15 pF for timing measurements, but the output can drive up to 50 pF while maintaining tpd < 32 ns and VOL < 0.4 V at IO = 4 mA. Beyond 50 pF, rise/fall times exceed 22 ns and output voltage swing degrades, risking setup/hold violations in downstream receivers.

Is the exposed pad on the TSSOP package electrically connected?

No. The exposed pad in SOT402-1 (TSSOP14) is a mechanical thermal slug with no electrical connection. Nexperia documentation explicitly states it has "no electrical or mechanical requirement to solder" and recommends leaving it floating or connecting only to GND if soldered - never to VCC or signal nets.