National Semiconductor MM74HCT32N Quad 2-Input OR Gate DIP Used

TTL-compatible CMOS quad OR logic IC for 5V control boards - DIP-14

Product Condition

Used component in good condition. Sourced from demanufactured equipment and covered by our satisfaction guarantee. Marked MM74HCT32N with National Semiconductor logo. Through-hole PDIP package as shown.

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Product Overview

National Semiconductor MM74HCT32N quad 2-input OR gate integrates four independent OR gates in a 14-pin through-hole package. Built on CMOS technology with TTL-compatible input thresholds, it is designed for stable 5V logic systems where older TTL devices are present. Each gate outputs a high logic level when either input is high, making it a core building block for combinational logic in control boards and interface circuits. This version is commonly used in industrial and legacy electronics where the exact logic family and footprint must match the original design.

Key Features

• Part number: MM74HCT32N
• Manufacturer: National Semiconductor
• Logic function: Quad 2-input OR gate (4 gates total)
• TTL-compatible input thresholds (HCT family)
• Propagation delay time: 20 ns
• Output level current: -4.8 mA to 4.8 mA
• Operating temperature range: -40 C to 85 C
• Operating voltage: 5V ±10 percent (HCT family requirement)
• Mounting style: Through hole, 14-pin PDIP

Applications

• Industrial control board repair in 5V TTL-based systems
• PLC-related interface and signal-combining circuits
• Legacy instrumentation and timing boards
• Combining status or enable lines in relay and I/O modules
• Bench-level prototyping with through-hole logic
• Restoration of vintage computers, arcade boards, and controllers

Frequently Asked Questions

Will this replace a standard 74HC32?

Not always. The HCT version has TTL-compatible input thresholds and is intended for 5V systems that use TTL-level signals. If your circuit depends on standard CMOS thresholds or runs at a different supply voltage, confirm compatibility before installing.

Is this safe to use in a 3.3V system?

No. The MM74HCT32N is designed for a 5V supply with a ±10 percent tolerance. Operating outside that range can shift logic thresholds and cause unreliable switching.

Does it require special handling?

As a CMOS device, it is more sensitive to electrostatic discharge than older bipolar logic. Handle using standard ESD precautions. Also, do not leave unused inputs floating - tie them to a defined logic level to prevent noise and unwanted switching.

Has the chip been tested?

It is described as a used component in good condition and covered by our satisfaction guarantee. No additional performance claims are made beyond the stated specifications.

What package is it in?

14-pin PDIP, through-hole mounting. Confirm your board layout and pin orientation before installation.

When a 5V control board depends on the right threshold, the letters HCT matter. Match the marking, seat it cleanly, and let the logic do its job.