NXP Semiconductors 74HCT4075DB,112

Overview

74HCT4075DB,112 from Nexperia is a triple 3-input OR gate in SO14 (SOT108-1) package, TTL-compatible input logic levels, 4.5 V to 5.5 V supply range, propagation delay of 12–36 ns at VCC = 4.5 V, and rated for -40 °C to +125 °C operation - used in digital logic interfacing, bus arbitration, and control signal combination in industrial PLCs and embedded controllers.

For engineers reviewing the 74HCT4075DB,112 datasheet, 74HCT4075DB,112 pinout, 74HCT4075DB,112 application, or 74HCT4075DB,112 equivalent, this page delivers verified pin functions, real-world timing behavior under 50 pF load, thermal derating guidance above 100 °C, and direct substitution options with documented VIH/VIL and output drive differences.

Technical Context

This device implements three independent 3-input OR gates using silicon-gate CMOS technology with TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), enabling direct interface with legacy 5 V TTL logic families without level translation. Each gate drives ±4.0 mA at VOH ≥ 3.98 V and VOL ≤ 0.26 V under recommended conditions.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when current-limiting resistors are used. The SO14 package supports surface-mount reflow assembly and provides 3.9 mm body width with 1.27 mm lead pitch, matching JEDEC MS-012 mechanical standards.

Key Specifications

Pinout & Package

Package: SO14 (SOT108-1), plastic small outline, 14-lead, 3.9 mm body width, 1.27 mm pitch, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input OR gate applications.

Compared with 74HC4075DB,112 and SN74LS30DR, the 74HCT4075DB,112 uniquely balances TTL input compatibility, low ICC, and integrated overvoltage protection - making it optimal for upgrading legacy systems while minimizing board-level changes.

Availability

74HCT4075DB,112 is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral interface, legacy system bus arbitration, and power sequencing monitor applications requiring stable component supply across extended temperature ranges.

Supply support for 74HCT4075DB,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, discrete, and MOSFET solutions optimized for efficiency-critical applications.

The 74HCT4075 belongs to Nexperia's industry-standard 74HCT logic family, designed specifically to bridge TTL and CMOS domains with robust input thresholds, low power, and wide temperature operation.

FAQ

What is the maximum supply voltage for 74HCT4075DB,112?

The absolute maximum supply voltage is +7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation above 5.5 V risks violating input/output voltage limits and may cause latch-up or accelerated aging. Derated total power dissipation applies above 100 °C ambient.

Can 74HCT4075DB,112 drive a 50 Ω transmission line directly?

Yes - with VOH ≥ 3.98 V and VOL ≤ 0.26 V at ±4.0 mA, it can terminate a 50 Ω line referenced to 5 V (delivering ~100 mA peak into short) or source/sink 100 mA into a 50 Ω load with <0.5 V droop. For clean edges, add a series 33 Ω resistor near the driver output.

Does 74HCT4075DB,112 require external pull-up or pull-down resistors on unused inputs?

No - unused inputs may be tied directly to VCC or GND. Floating inputs are prohibited due to increased ICC and potential oscillation. Internal input structure does not require external biasing; connecting to supply rails ensures defined logic state and minimizes power consumption.

How does the input clamp diode affect interfacing with 12 V sensors?

Clamp diodes limit input voltage to VCC + 0.5 V. To interface with 12 V sensors, use a series current-limiting resistor: R ≥ (12 V − VCC − 0.5 V) / 20 mA = 625 Ω minimum for VCC = 5 V. This ensures clamp current stays within ±20 mA absolute maximum rating.