onsemi MC74VHC32D

Overview

MC74VHC32D from ON Semiconductor is a quad 2-input OR gate IC fabricated in advanced silicon-gate CMOS technology, delivering TTL-compatible speed (t_PD = 3.8 ns typ at V_CC = 5 V) with CMOS low power (I_CC = 2 μA max at 25°C), operating across 2 V to 5.5 V, and supporting mixed-voltage interfacing via 7 V-tolerant inputs. It serves as a logic-level combiner in digital control, interface translation, and signal conditioning circuits.

For engineers reviewing the MC74VHC32D datasheet, pinout, applications, or equivalent options, key selection considerations include its 14-lead SOIC package, balanced propagation delays, high noise immunity (V_NIH/V_NIL = 28% V_CC), input overvoltage tolerance, and compatibility with standard logic families.

Technical Context

The MC74VHC32D implements four independent OR gates in a single monolithic CMOS die, each with three-stage internal buffering for stable output drive and enhanced noise rejection. Its input structure supports 7 V absolute maximum input voltage-enabling safe 5 V-to-3 V system interfacing without external level shifters.

Designed for industrial temperature range (−40°C to +85°C), it features power-down protection on all inputs, latchup immunity exceeding 300 mA, and ESD robustness (HBM > 2000 V). The device exhibits low dynamic noise (V_OLP ≤ 0.8 V max) and matched t_PLH/t_PHL delays across all channels.

Key Specifications

Pinout & Package

MC74VHC32D is supplied in a 14-lead SOIC package (Case 751A-03), with 1.27 mm pitch, body dimensions 8.55–8.75 mm × 3.80–4.00 mm, and standard JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC32APWR and 74HC32D, the MC74VHC32D uniquely balances 7 V input tolerance, 3.8 ns speed, and 2 μA quiescent current - making it optimal for next-generation industrial and automotive interfaces requiring both robustness and efficiency.

Availability

MC74VHC32D is available at Aetrix Electronics and suitable for industrial PLC input conditioning, automotive body control logic, and IoT edge node wake-up logic requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MC74VHC32D 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The MC74VHC32D belongs to the VHC (Very High Speed CMOS) logic family, engineered to replace bipolar TTL with CMOS efficiency while preserving speed and interoperability across voltage domains.

FAQ

What is the maximum input voltage rating for MC74VHC32D?

The MC74VHC32D supports DC input voltages up to +7.0 V, independent of V_CC. This allows safe interfacing between higher-voltage subsystems (e.g., 5 V microcontrollers) and lower-voltage logic domains (e.g., 3.3 V FPGAs) without external clamping or level-shifting circuitry. This specification is validated across the full operating temperature range (−40°C to +85°C) and is explicitly defined in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet for MC74VHC32D.

Does MC74VHC32D support operation at 3.3 V supply?

Yes, MC74VHC32D is fully specified for operation at 3.3 V (V_CC = 3.3 V ± 0.3 V), with propagation delay of 5.5 ns (typ) and output drive of ±4 mA. All DC and AC parameters-including VIH/VIL thresholds, noise margins, and power consumption-are guaranteed across the 2.0 V to 5.5 V range, making MC74VHC32D ideal for modern mixed-supply digital systems where 3.3 V is the primary logic rail.

Is MC74VHC32D pin-compatible with older 74-series OR gates?

MC74VHC32D is pin- and function-compatible with industry-standard 74-series quad 2-input OR gates including 74HC32, 74HCT32, and 74LS32 in the 14-lead SOIC (D suffix) package. Pin numbering, logic function, and basic timing behavior match exactly, enabling drop-in replacement in existing designs-though users should verify timing margins due to MC74VHC32D's significantly faster propagation delay (3.8 ns vs. 19 ns for HC).

What is the thermal performance of MC74VHC32D in SOIC package?

The MC74VHC32D in SOIC package (Case 751A-03) has a power dissipation limit of 500 mW in still air, with thermal derating of −7 mW/°C above 65°C ambient. At typical logic switching activity and 5 V supply, dynamic power consumption remains well below 10 mW per gate, ensuring junction temperatures stay within safe limits even in enclosed industrial enclosures without forced airflow.

How does MC74VHC32D handle unused inputs?

Unused inputs on MC74VHC32D must be tied to a valid logic level-either V_CC or GND-to prevent floating nodes that could cause excessive current draw, oscillation, or ESD susceptibility. The datasheet explicitly prohibits leaving inputs unconnected. This requirement applies identically to all four OR gates and is critical for achieving the rated 2 μA maximum quiescent current and reliable noise immunity in deployed MC74VHC32D circuits.