onsemi MC74HC32ADTEL

Overview

MC74HC32ADTEL from onsemi is a quad 2-input OR gate high-performance silicon-gate CMOS logic IC in TSSOP-14 package, operating from 2.0 V to 6.0 V, delivering 10 LSTTL load drive capability with 1 µA max input current and propagation delay as low as 13 ns at VCC = 6.0 V - used in digital control logic, level translation, and bus interface circuits.

For engineers reviewing the MC74HC32ADTEL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, validated pin functions, real-world use cases, and two confirmed alternative parts for industrial control, instrumentation, and embedded system design.

Technical Context

The MC74HC32ADTEL implements four independent OR gates (Y = A + B) using silicon-gate CMOS technology, ensuring compatibility with both CMOS and LSTTL logic families when pull-up resistors are applied. Its inputs tolerate voltages up to VCC + 0.5 V, and outputs swing rail-to-rail under light loads.

Designed per JEDEC Standard No. 7A, it features high noise immunity, 48-FET chip complexity, and operates across –55°C to +125°C. Input rise/fall time limits range from 400 ns (VCC = 6.0 V) to 1000 ns (VCC = 2.0 V), supporting reliable timing in mixed-voltage systems.

Key Specifications

Pinout & Package

TSSOP-14 (DT suffix, Case 948G), 4.9 mm × 4.4 mm body, 0.65 mm pitch, thin-profile surface-mount package rated for reflow and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC32PW and 74HC32D,653, the MC74HC32ADTEL offers the widest temperature range (–55°C to +125°C), lowest profile TSSOP package, and JEDEC 7A certification - making it the preferred choice for aerospace, downhole, and high-reliability industrial deployments where thermal margin and standards alignment are critical.

Availability

MC74HC32ADTEL is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, medical infusion pumps, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74HC32ADTEL 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and medical markets with differentiated silicon solutions.

The MC74HC32ADTEL belongs to the 74HC high-speed CMOS logic family, designed specifically for robust, low-power, mixed-voltage digital interfacing in harsh-environment applications where reliability and wide operating margins are mandatory.

FAQ

What logic family does the MC74HC32ADTEL belong to, and how does it differ from LS-TTL?

The MC74HC32ADTEL belongs to the 74HC (High-Speed CMOS) logic family. Unlike LS-TTL, it draws significantly less supply current (max 40 µA vs. several mA), operates over a wider voltage range (2.0–6.0 V vs. 4.75–5.25 V), and offers higher noise immunity due to CMOS input structure. It is pinout-compatible with LS32 but requires no external pull-ups for LSTTL input compatibility - simplifying mixed-technology designs while reducing power and component count.

Can the MC74HC32ADTEL operate reliably at 2.0 V supply, and what performance trade-offs apply?

Yes, the MC74HC32ADTEL is fully specified down to 2.0 V supply, with guaranteed VIH = 1.50 V and VOL ≤ 0.40 V at 5.2 mA sink. However, propagation delay increases to 110 ns (vs. 13 ns at 6.0 V), and output drive strength decreases - limiting usable fanout in high-speed paths. It remains suitable for low-power, low-frequency control logic such as battery-backed status monitoring where speed is secondary to energy efficiency.

Is the MC74HC32ADTEL pinout compatible with other 74HC32 variants like MC74HC32AN or MC74HC32ADR2?

Yes - all MC74HC32x variants share identical 14-pin functional pinout (A1/B1/Y1…VCC/GND), regardless of package (PDIP, SOIC, TSSOP). The MC74HC32ADTEL (TSSOP-14) maps 1:1 to MC74HC32AN (PDIP-14) and MC74HC32ADR2 (SOIC-14) at the signal level. Only PCB footprint and thermal characteristics differ; no logic or timing revalidation is needed when migrating between packages.

What is the maximum capacitive load the MC74HC32ADTEL can drive while maintaining specified timing?

The MC74HC32ADTEL's AC specifications (e.g., tPLH = 13 ns) are guaranteed for CL = 50 pF. Driving larger loads increases propagation delay approximately linearly with capacitance - e.g., at CL = 100 pF, delay may increase by ~30%. For loads exceeding 100 pF, add a series resistor (22–47 Ω) near the output to damp ringing and maintain signal integrity without violating VOH/VOL limits.

How should unused inputs on the MC74HC32ADTEL be handled to ensure stable operation?

Unused inputs on the MC74HC32ADTEL must be tied to a valid logic level - either VCC or GND - using a direct connection or pull-up/down resistor (10 kΩ typical). Floating inputs cause increased ICC, erratic output behavior, and potential device overheating due to partial conduction in CMOS input stages. All four gates' inputs must be terminated; unused outputs may be left open.