SN74HCT32D Equivalent & Substitute Parts

Part Overview

The SN74HCT32D is a 4-channel 2-input OR gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The device operates within the 4.5V to 5.5V supply voltage range and is suitable for digital logic applications requiring OR gate functionality. Equivalent and substitute parts maintain identical or superior electrical characteristics while offering active product status or improved availability.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	4mA, 4mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	22ns @ 5.5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN74HCT32D is determined by the following critical parameters:

Logic Type: OR Gate (4 channels, 2 inputs per channel)
Voltage Supply Range: 4.5V ~ 5.5V
Package Type: 14-SOIC surface mount
Input/Output Logic Levels: 0.8V (low), 2V (high)
Output Current Capability: 4mA minimum
Propagation Delay: 22ns or better at specified conditions
RoHS3 Compliance and MSL Level 1

Substitute parts are grouped into two categories: direct functional equivalents maintaining identical specifications, and alternative manufacturers offering the same base product number (74HCT32) with compatible electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Output Current (High/Low)	Propagation Delay	Operating Temp	Package	Product Status
SN74HCT32D	Texas Instruments	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V, 50pF	-40°C ~ 85°C	14-SOIC	Discontinued
SN74HCT32DR	Texas Instruments	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	4mA / 4mA	22ns @ 5.5V, 50pF	-40°C ~ 85°C	14-SOIC	Active
74HCT32D,653	NXP Semiconductors	OR Gate	4 / 2	4.5V ~ 5.5V	Not specified	Not specified	Not specified	Not specified	14-SOIC	Active
74HCT32S14-13	Diodes Incorporated	OR Gate	4 / 2	4.5V ~ 5.5V	20 µA	4mA / 4mA	24ns @ 4.5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
MC74HCT32ADG	onsemi	OR Gate	4 / 2	4.5V ~ 5.5V	1 µA	4mA / 4mA	15ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Obsolete
MC74HCT32ADR2G	onsemi	OR Gate	4 / 2	4.5V ~ 5.5V	1 µA	4mA / 4mA	15ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Active
MM74HCT32M	Fairchild Semiconductor	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	20ns @ 5V, 15pF	-40°C ~ 85°C	14-SOIC	Active
MM74HCT32MX	Fairchild Semiconductor	OR Gate	4 / 2	4.5V ~ 5.5V	2 µA	4.8mA / 4.8mA	20ns @ 5V, 15pF	-40°C ~ 85°C	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: SN74HCT32DR

The SN74HCT32DR from Texas Instruments is the direct equivalent to the SN74HCT32D. It maintains identical electrical specifications, supply voltage range, propagation delay, and output current characteristics. The part is currently active with high inventory availability (15,923 units). Packaging is available in Cut Tape and Digi-Reel formats, suitable for both manual and automated assembly processes.

Secondary Recommendation: MC74HCT32ADR2G

The MC74HCT32ADR2G from onsemi provides superior performance characteristics with lower quiescent current (1 µA vs. 2 µA) and faster propagation delay (15ns vs. 22ns). Operating temperature range extends to -55°C to 125°C, providing broader environmental compatibility. Product status is active with 10,300 units in stock. This part is suitable for applications requiring enhanced speed performance or extended temperature operation.

Alternative Recommendation: MM74HCT32M or MM74HCT32MX

Fairchild Semiconductor parts MM74HCT32M and MM74HCT32MX offer equivalent functionality with improved output current capability (4.8mA vs. 4mA). Both parts maintain the same supply voltage and logic specifications. These options provide additional sourcing flexibility with active product status and substantial inventory levels.

Not Recommended: MC74HCT32ADG

Although functionally compatible, the MC74HCT32ADG carries obsolete product status and should not be selected for new designs despite superior electrical performance.

Not Recommended: 74HCT32D,653

The NXP part lacks complete electrical specification data in available documentation, limiting its suitability for critical applications requiring full parameter verification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74HCT32D with SN74HCT32DR?

A: Yes. The SN74HCT32DR is the direct functional equivalent with identical electrical specifications, supply voltage, logic levels, and 14-SOIC packaging. The only difference is packaging format (Cut Tape/Digi-Reel vs. Tube) and active product status.

Q: What is the difference between 14-SOIC and 14-SO packaging?

A: Both designations refer to the same 14-pin Small Outline IC package with 0.154" width and 3.90mm body width. The terms are used interchangeably by different manufacturers. All listed substitutes are compatible with the same PCB footprint.

Q: Are onsemi parts MC74HCT32ADG and MC74HCT32ADR2G interchangeable?

A: Both parts share identical electrical specifications and 14-SOIC packaging. The primary difference is product status: MC74HCT32ADR2G is active, while MC74HCT32ADG is obsolete. For new designs, select the active MC74HCT32ADR2G variant.

Q: Does the higher quiescent current of 74HCT32S14-13 (20 µA) affect circuit performance?

A: The 74HCT32S14-13 maintains all critical electrical parameters including supply voltage, logic levels, and output current. The elevated quiescent current may impact low-power applications but does not affect functional compatibility or logic operation.

Q: Can I use MC74HCT32ADR2G in applications requiring -40°C to 85°C operation?

A: Yes. The MC74HCT32ADR2G operates across -55°C to 125°C, which encompasses the -40°C to 85°C range. The extended temperature capability provides additional design margin without compromising performance within the original specification window.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, consistent with the original SN74HCT32D specifications.

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