SN74HC32DT OR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74HC32DT 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, making equivalent substitute parts necessary for ongoing design and production requirements. The SN74HC32DT operates across a 2V to 6V supply voltage range with a maximum propagation delay of 17ns at 6V with 50pF load, suitable for general-purpose logic applications requiring OR gate functionality.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	17ns
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 for the SN74HC32DT is determined by strict equivalence across the following critical parameters:

Logic configuration (4-channel 2-input OR gate), supply voltage range (2V ~ 6V), input/output logic levels, output current capability (5.2mA), and surface mount packaging in 14-SOIC form factor. Parts meeting these criteria are grouped as direct substitutes regardless of minor variations in propagation delay (13ns to 17ns range), quiescent current (1µA to 20µA), or operating temperature range extensions.

Substitute parts are categorized as follows:

Parametric equivalents share identical electrical specifications and packaging. Direct manufacturer alternatives meet all functional and electrical requirements from different manufacturers. MFR recommended parts are manufacturer-designated alternatives with potential enhancements in performance or temperature range. Parts with extended temperature ranges (-55°C to 125°C) or automotive qualifications (AEC-Q100) provide additional operational flexibility beyond the original specification.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Propagation Delay @ 6V, 50pF	Operating Temperature	Package	Product Status
SN74HC32DT	Texas Instruments	OR Gate	4 / 2	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-SOIC	Discontinued
SN74HC32DR	Texas Instruments	OR Gate	4 / 2	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-SOIC	Active
MC74HC32ADR2G	onsemi	OR Gate	4 / 2	2V ~ 6V	1 µA	13ns	-55°C ~ 125°C	14-SOIC	Active
MM74HC32M	Fairchild Semiconductor	OR Gate	4 / 2	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-SOIC	Active
74HC32D,653	Nexperia USA Inc.	OR Gate	4 / 2	2V ~ 6V	2 µA	15ns	-40°C ~ 125°C	14-SO	Active
74HC32D-Q100,118	Nexperia USA Inc.	OR Gate	4 / 2	2V ~ 6V	2 µA	15ns	-40°C ~ 125°C	14-SO	Active
74HC32S14-13	Diodes Incorporated	OR Gate	4 / 2	2V ~ 6V	20 µA	15ns	-40°C ~ 125°C	14-SO	Active
MC74HC32ADG	onsemi	OR Gate	4 / 2	2V ~ 6V	1 µA	13ns	-55°C ~ 125°C	14-SOIC	Active
NLV74HC32ADR2G	onsemi	OR Gate	4 / 2	2V ~ 6V	1 µA	13ns	-55°C ~ 125°C	14-SOIC	Obsolete
TC74HC32AF(EL,F)	Toshiba Semiconductor and Storage	OR Gate	4 / 2	2V ~ 6V	1 µA	13ns	-40°C ~ 85°C	14-SOP	Active
MM74HC32MX	Fairchild Semiconductor	OR Gate	4 / 2	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-SOIC	Active

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC32DT, the SN74HC32DR from Texas Instruments is the primary choice, offering identical electrical specifications and active product status with established supply chain availability.

When extended operating temperature range is required, MC74HC32ADR2G and MC74HC32ADG from onsemi provide -55°C to 125°C operation with improved propagation delay (13ns) and lower quiescent current (1µA), both in active status with ROHS3 compliance.

For automotive applications requiring AEC-Q100 qualification, 74HC32D-Q100,118 from Nexperia USA Inc. meets this requirement with active status and extended temperature range to 125°C.

The Nexperia 74HC32D,653 and Diodes Incorporated 74HC32S14-13 are functionally equivalent alternatives with active status and extended temperature ranges, though the latter exhibits higher quiescent current (20µA).

Fairchild Semiconductor MM74HC32M and MM74HC32MX provide parametric equivalence with identical specifications to the original part and active product status.

The Toshiba TC74HC32AF(EL,F) is functionally compatible but uses a 14-SOP package (5.30mm width) instead of 14-SOIC (3.90mm width), requiring PCB layout verification before selection.

NLV74HC32ADR2G from onsemi is obsolete and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can SN74HC32DR be used as a direct replacement for SN74HC32DT?

A: Yes. SN74HC32DR is a parametric equivalent from the same manufacturer with identical electrical specifications, supply voltage range, propagation delay, and 14-SOIC packaging. Both are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between MC74HC32ADR2G and MC74HC32ADG?

A: Both are from onsemi with identical electrical specifications (1µA quiescent current, 13ns propagation delay, -55°C to 125°C operating range). MC74HC32ADR2G is supplied in Cut Tape & Digi-Reel packaging, while MC74HC32ADG is supplied in Tube packaging. Electrical performance is equivalent.

Q: Are the Nexperia 74HC32D,653 and 74HC32D-Q100,118 interchangeable?

A: Both are from Nexperia with identical electrical specifications and 14-SO packaging. The 74HC32D-Q100,118 includes AEC-Q100 automotive qualification. Selection depends on application requirements for automotive compliance.

Q: Why does TC74HC32AF(EL,F) have a different package width?

A: TC74HC32AF(EL,F) uses 14-SOP packaging with 5.30mm width compared to the standard 14-SOIC at 3.90mm width. While electrically equivalent, PCB footprint and layout compatibility must be verified before substitution.

Q: Can NLV74HC32ADR2G be used in new designs?

A: No. NLV74HC32ADR2G is marked as obsolete and should not be selected for new designs. Active alternatives such as MC74HC32ADR2G or MC74HC32ADG from onsemi provide equivalent or superior specifications.

Q: What is the significance of the 20µA quiescent current in 74HC32S14-13?

A: The 74HC32S14-13 from Diodes Incorporated has a higher quiescent current specification (20µA) compared to most alternatives (1µA to 2µA). This may impact power consumption in battery-powered or low-power applications but remains within functional equivalence for standard logic applications.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. TC74HC32AF(EL,F) from Toshiba is RoHS Compliant without the specific ROHS3 designation. Verify compliance requirements for your specific application before final selection.

Q: What packaging options are available for 74HC32 OR gate ICs?

A: Available packages include 14-SOIC (0.154", 3.90mm width), 14-SO, and 14-SOP (0.209", 5.30mm width). Packaging selection affects PCB layout and must match design requirements. Most alternatives use 14-SOIC or 14-SO form factors.

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