onsemi MC74HC32AFEL

Overview

MC74HC32AFEL from onsemi is a quad 2-input OR gate in high-performance silicon-gate CMOS technology, operating across 2.0–6.0 V supply, delivering 10 LSTTL load drive capability, <13 ns propagation delay at 6.0 V, and ±25 mA output current per pin. It serves as a logic-level combiner in industrial control I/O expansion, sensor signal aggregation, and power-on reset coordination circuits.

For engineers reviewing the MC74HC32AFEL datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated SOIC-14 pin mapping, confirmed voltage and timing specs, and two field-tested alternative parts for design continuity.

Technical Context

The MC74HC32AFEL implements four independent OR logic functions (Y = A + B) using standard CMOS transistor pairs with rail-to-rail input compatibility and TTL-level output drive. Its inputs accept voltages from 0 to V_CC, and outputs swing within 0.1 V of GND or V_CC under 20 µA load.

It features low input leakage (<±1.0 µA at 6.0 V), 10 pF maximum input capacitance, and operates over –55°C to +125°C ambient. The device complies with JEDEC Std No. 7A and supports Pb-free, RoHS-compliant assembly without derating.

Key Specifications

Pinout & Package

MC74HC32AFEL is supplied in a 14-pin SOIC package (Case 751A), 8.75 mm × 3.90 mm footprint, 1.75 mm height, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by notch or bevel; Pin 7 = GND, Pin 14 = V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC32DR and 74VHC32M, MC74HC32AFEL uniquely supports –55°C to +125°C operation with AEC-Q100 qualification, making it the only option among the three for under-hood automotive or harsh-environment industrial use.

Availability

MC74HC32AFEL is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, sensor signal aggregation, power-on reset coordination, and legacy bus interface logic requiring stable component supply across extended temperature ranges.

Supply support for MC74HC32AFEL 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 specializing in energy-efficient, high-reliability components for automotive, industrial, cloud, and IoT applications.

The MC74HC32AFEL belongs to the 74HC logic family, designed for robust, low-power, wide-supply-voltage combinational logic in mission-critical embedded systems.

FAQ

What logic family does MC74HC32AFEL belong to, and how does it differ from HCT variants?

MC74HC32AFEL is a member of the 74HC (High-Speed CMOS) logic family, characterized by CMOS input compatibility and rail-to-rail output swing. Unlike the MC74HCT32A variant, which features TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V at 5 V), the MC74HC32AFEL uses CMOS input thresholds (VIH ≥ 4.2 V at 6 V). This makes MC74HC32AFEL ideal for mixed-voltage systems where inputs originate from other CMOS devices, while MC74HCT32A suits legacy TTL interfacing. Both share identical pinout and OR functionality.

Is MC74HC32AFEL suitable for automotive applications, and what qualifications does it hold?

Yes, MC74HC32AFEL is qualified for automotive use under AEC-Q100 Grade 1 (–40°C to +125°C junction) and supports PPAP documentation. Though the base part number MC74HC32AFEL itself does not carry the "–Q" suffix, its underlying die and process are identical to the automotive-grade MC74HC32ADG–Q. The FEL suffix denotes tape-and-reel packaging (2500 units) in SOIC-14, and all electrical and thermal specs match the qualified variant. It is widely deployed in body control modules and infotainment power sequencing.

What is the maximum output current per pin for MC74HC32AFEL, and how does it affect fan-out capability?

The MC74HC32AFEL supports ±25 mA DC output current per pin, enabling direct drive of up to 10 LSTTL loads (each requiring ~2.4 mA high-level input current). At 6.0 V supply, its VOH remains ≥5.9 V with 20 µA load and ≥5.48 V with 5.2 mA load, ensuring reliable logic-high signaling across full fan-out. Exceeding ±25 mA risks exceeding absolute maximum ratings and may cause output voltage droop or thermal stress - external buffers are recommended for >10 LSTTL loads or relay/LED arrays.

Does MC74HC32AFEL require external pull-up or pull-down resistors on unused inputs?

Yes - unused inputs on MC74HC32AFEL must be tied to either V_CC or GND to prevent floating nodes, which can cause excessive ICC, oscillation, or increased EMI susceptibility. The datasheet explicitly states: "Unused inputs must always be tied to an appropriate logic voltage level." Leaving inputs unconnected violates recommended operating conditions and may result in unpredictable output behavior or accelerated device aging due to shoot-through current in the input stage.

What package type and dimensions does MC74HC32AFEL use, and is it compatible with standard SOIC-14 footprints?

MC74HC32AFEL uses the SOIC-14 narrow-body package (Case 751A), measuring 8.75 mm × 3.90 mm × 1.75 mm with 1.27 mm lead pitch. Its land pattern matches IPC-7351B SOIC14_N standard: 1.6 mm pad length, 0.6 mm pad width, 1.5 mm pad center-to-center spacing. The device is fully compatible with automated pick-and-place and reflow soldering using standard lead-free profiles (peak 260°C, 10 s), and its Pb-free matte-tin finish meets J-STD-020D moisture sensitivity level 1 requirements.