NXP Semiconductors 74HC27PW,112

Overview

74HC27PW,112 from Nexperia is a triple 3-input CMOS NOR gate in TSSOP14 package, operating from 2.0 V to 6.0 V supply, with propagation delay as low as 8 ns at VCC = 6.0 V and 15 pF load, input clamp diodes enabling overvoltage-tolerant interfacing, and specified for -40 °C to +125 °C industrial temperature range - used in digital logic control, bus arbitration, and enable/disable signal conditioning in embedded microcontroller peripherals.

For engineers reviewing the 74HC27PW,112 datasheet, 74HC27PW,112 pinout, 74HC27PW,112 application, or 74HC27PW,112 equivalent, key selection criteria include supply voltage compatibility (2.0–6.0 V), TTL/CMOS input level distinction (74HC vs 74HCT), propagation delay vs. load capacitance, thermal derating behavior in TSSOP14, and pin-compatible substitution across SO14/TSSOP14/DHVQFN14 packages.

Technical Context

This device implements three independent 3-input NOR gates using standard CMOS process technology, each with input clamp diodes allowing safe interface to signals exceeding VCC when used with current-limiting resistors. The logic function follows strict Boolean NOR: output HIGH only when all three inputs are LOW.

It supports dual logic families: 74HC27PW uses CMOS-level inputs (VIH ≥ 70% VCC), while its 74HCT27PW variant accepts TTL-compatible inputs (VIH ≥ 2.0 V). Static characteristics include VIH/VIL thresholds, VOH/VOL drive capability up to ±4.0 mA, and ICC supply current under static conditions below 40 μA at 125 °C.

Key Specifications

Pinout & Package

TSSOP14 (SOT402-1) package: 4.4 mm body width, 0.65 mm lead pitch, 14-terminal surface-mount plastic thin shrink small outline package optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC27PW,112, the SO14 variant offers higher thermal mass and simpler rework but consumes more PCB area; the LVC1G02 solution trades integration and voltage flexibility for minimal footprint - neither matches the native triple 3-input functionality and wide-VCC capability of the original.

Availability

74HC27PW,112 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC27PW,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The 74HC/HCT logic family delivers robust, pin-compatible replacements for legacy TTL and CMOS devices, designed specifically for noise-immune digital interfacing and power-efficient combinational logic in harsh environments.

FAQ

What is the maximum clock frequency supported by 74HC27PW,112?

The 74HC27PW,112 is a combinational logic device with no internal clock; its usable toggle rate depends on propagation delay and load. With 8 ns typical tPD at 6.0 V and 15 pF, it supports clean signal transitions up to ~60 MHz in feedback-free configurations, assuming proper layout and termination to avoid ringing or metastability.

Can 74HC27PW,112 interface directly with 5 V TTL outputs?

No - 74HC27PW,112 has CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V), which may not reliably recognize 5 V TTL HIGH (typically 2.4 V min). For guaranteed compatibility, use the pin-compatible 74HCT27PW,112 variant, whose TTL-compatible inputs accept VIH ≥ 2.0 V across 4.5–5.5 V supply.

Is the exposed pad on the TSSOP14 package electrically connected?

No - the TSSOP14 (SOT402-1) package for 74HC27PW,112 does not feature an exposed thermal pad. Unlike DHVQFN variants, this package relies on lead-frame conduction; thermal performance is governed by PCB copper area connected to pins 7 (GND) and 14 (VCC), with derating starting at 81 °C.

Does 74HC27PW,112 require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs must be terminated to VCC or GND to prevent floating nodes, which cause increased ICC, noise susceptibility, and potential oscillation. Tie unused inputs directly to VCC (for LOW-effective logic) or GND (for HIGH-effective logic); do not leave open, even with internal clamps present.