NXP Semiconductors 74HCT32D,653

Overview

74HCT32D,653 from Nexperia is a quad 2-input OR gate logic IC operating at TTL-compatible input levels (VIH = 2.0 V min, VIL = 0.8 V max), with supply voltage range 4.5–5.5 V, propagation delay of 11–36 ns (VCC = 4.5 V, CL = 50 pF), and SO14 package rated for -40 °C to +125 °C. It serves as a fundamental combinational logic building block in digital control, bus arbitration, and signal conditioning circuits.

For engineers reviewing the 74HCT32D,653 datasheet, 74HCT32D,653 pinout, 74HCT32D,653 application, or 74HCT32D,653 equivalent, key selection considerations include TTL-level input compatibility, guaranteed operation up to +125 °C, symmetrical output drive (±4 mA), balanced propagation delays across all four gates, and SO14 package suitability for industrial PCB layouts requiring thermal robustness and legacy footprint compatibility.

Technical Context

The 74HCT32D,653 implements four independent 2-input OR functions using CMOS technology with TTL-compatible input thresholds-ensuring direct interfacing with legacy 5 V TTL outputs without level shifting. Its inputs feature integrated clamp diodes enabling safe interface to voltages exceeding VCC when used with current-limiting resistors.

It delivers symmetrical output impedance and balanced tPHL/tPLH propagation delays (11–36 ns over temperature and voltage), supporting deterministic timing in synchronous logic systems. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), and meets HBM ESD >2000 V and CDM >1000 V per JS-001/JS-002.

Key Specifications

Pinout & Package

74HCT32D,653 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with automated pick-and-place and reflow soldering per IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad OR gate applications.

Compared with 74HCT32PW,118, the 74HCT32D,653 offers superior mechanical robustness and legacy footprint compatibility; compared with SN74HCT32DR, it provides guaranteed operation at +125 °C - a decisive advantage in automotive and industrial thermal environments.

Availability

74HCT32D,653 is available at Aetrix Electronics and suitable for industrial control logic, automotive body electronics, legacy bus interface design, and programmable logic glue applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT32D,653 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, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT32D,653 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for seamless integration between TTL and CMOS systems while maintaining robust operation across extreme temperatures and noisy environments.

FAQ

Can 74HCT32D,653 operate at 3.3 V supply?

No. The 74HCT32D,653 is specified only for 4.5–5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) become marginal, and output drive degrades significantly. For 3.3 V systems, use the 74LVC32 or 74AHC32 instead - both offer guaranteed 3.3 V operation with TTL-compatible inputs.

Is the SO14 package RoHS-compliant and lead-free?

Yes. The 74HCT32D,653 in SOT108-1 package is fully RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 Category 3 marking requirements. The finish is matte tin, with peak reflow temperature tolerance up to 260 °C per JEDEC J-STD-020.

What is the maximum capacitive load this device can drive reliably?

The 74HCT32D,653 is characterized up to 50 pF load capacitance in dynamic testing. While it can drive higher capacitance (e.g., 100 pF) at reduced speed, propagation delay increases nonlinearly beyond 50 pF. For loads >50 pF, add a buffer stage or use a higher-drive logic family like 74ACT.

Does this part have internal ESD protection on all pins?

Yes. All inputs and outputs include integrated ESD protection diodes meeting HBM >2000 V (ANSI/ESDA/JEDEC JS-001 Class 2) and CDM >1000 V (JS-002 Class C3). GND and VCC pins also feature protection, but sustained overvoltage on power rails requires external TVS devices per system-level requirements.