SN74HC32D Equivalent & Substitute Parts

Part Overview

The SN74HC32D 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 but remains available through inventory channels. The OR gate function is fundamental in digital logic applications requiring signal combination and conditional routing. Substitute parts are necessary due to product discontinuation status and to support design flexibility across manufacturing sources and packaging options.

Key Parameters

Parameter	Value
Logic Type	OR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	2V to 6V
Operating Temperature Range	-40°C to 85°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Max Propagation Delay	17ns @ 6V, 50pF
Current Output High/Low	5.2mA / 5.2mA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC32D is determined by the following criteria:

Primary Substitution Parameters:

Logic type: OR Gate (4 channels, 2 inputs per channel)
Supply voltage range: 2V to 6V minimum
Package compatibility: 14-SOIC or 14-SO form factor
Operating temperature: Minimum -40°C to 85°C coverage
Mounting type: Surface mount

Secondary Compatibility Factors:

Propagation delay: 17ns or faster at 6V, 50pF load
Output current capability: 5.2mA minimum for both high and low states
Input logic levels: 0.5V to 1.8V (low), 1.5V to 4.2V (high)
Quiescent current: 2µA maximum (relaxed for some alternatives)

Parts meeting all primary parameters are direct functional equivalents. Parts with enhanced specifications (lower propagation delay, lower quiescent current, extended temperature range) are superior alternatives. Packaging variants (Cut Tape, Tape & Reel, Tube) do not affect electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Temp Range	Prop Delay (ns)	Quiescent Current (µA)	Package
SN74HC32D	Texas Instruments	Discontinued	2V–6V	-40°C to 85°C	17 @ 6V	2	14-SOIC
SN74HC32DR	Texas Instruments	Active	2V–6V	-40°C to 85°C	17 @ 6V	2	14-SOIC
MC74HC32ADR2G	onsemi	Active	2V–6V	-55°C to 125°C	13 @ 6V	1	14-SOIC
MC74HC32ADG	onsemi	Active	2V–6V	-55°C to 125°C	13 @ 6V	1	14-SOIC
MM74HC32M	Fairchild Semiconductor	Active	2V–6V	-40°C to 85°C	17 @ 6V	2	14-SOIC
MM74HC32MX	Fairchild Semiconductor	Active	2V–6V	-40°C to 85°C	17 @ 6V	2	14-SOIC
74HC32D,653	Nexperia USA Inc.	Active	2V–6V	-40°C to 125°C	15 @ 6V	2	14-SO
74HC32D-Q100,118	Nexperia USA Inc.	Active	2V–6V	-40°C to 125°C	15 @ 6V	2	14-SO
74HC32S14-13	Diodes Incorporated	Active	2V–6V	-40°C to 125°C	15 @ 6V	20	14-SO
TC74HC32AF(EL,F)	Toshiba Semiconductor and Storage	Active	2V–6V	-40°C to 85°C	13 @ 6V	1	14-SOP
NLV74HC32ADR2G	onsemi	Obsolete	2V–6V	-55°C to 125°C	13 @ 6V	1	14-SOIC

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Active Status, Identical Specifications):

SN74HC32DR (Texas Instruments): Identical electrical performance to SN74HC32D with active product status. Same propagation delay and quiescent current. Available in Cut Tape and Digi-Reel packaging.
MM74HC32M and MM74HC32MX (Fairchild Semiconductor): Matching specifications with active status. Suitable for designs with -40°C to 85°C temperature requirements.

Tier 2 – Enhanced Performance Alternatives (Active Status, Superior Specifications):

MC74HC32ADR2G and MC74HC32ADG (onsemi): Lower propagation delay (13ns vs. 17ns), reduced quiescent current (1µA vs. 2µA), and extended temperature range (-55°C to 125°C). Recommended for applications requiring improved timing margins or wider operating temperature coverage.
TC74HC32AF(EL,F) (Toshiba): Equivalent performance to onsemi parts with 13ns propagation delay and 1µA quiescent current. Maintains -40°C to 85°C temperature range.

Tier 3 – Extended Temperature Range (Active Status, Broader Operating Window):

74HC32D,653 and 74HC32D-Q100,118 (Nexperia USA Inc.): Extended temperature range to 125°C with 15ns propagation delay. The Q100,118 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade reliability.
74HC32S14-13 (Diodes Incorporated): Extended temperature range to 125°C. Note elevated quiescent current specification (20µA) compared to standard parts; suitable for non-power-critical applications.

Tier 4 – Avoid:

NLV74HC32ADR2G (onsemi): Obsolete product status. Use active alternatives from onsemi (MC74HC32ADR2G or MC74HC32ADG) instead.

Packaging Considerations:

14-SOIC and 14-SO packages are mechanically compatible on standard PCB layouts with 0.154" (3.90mm) body width.
TC74HC32AF(EL,F) uses 14-SOP package with 0.209" (5.30mm) width; verify PCB footprint compatibility before substitution.

Frequently Asked Questions (FAQ)

Q: Can SN74HC32DR be used as a direct replacement for SN74HC32D? A: Yes. SN74HC32DR is the active production equivalent from Texas Instruments with identical electrical specifications, supply voltage range, operating temperature, propagation delay, and output current ratings. The only difference is packaging format (Cut Tape/Digi-Reel vs. Tube).

Q: What is the advantage of using MC74HC32ADR2G or MC74HC32ADG over the original SN74HC32D? A: These onsemi parts offer faster propagation delay (13ns vs. 17ns), lower quiescent current (1µA vs. 2µA), and extended operating temperature range (-55°C to 125°C vs. -40°C to 85°C). These improvements provide better timing performance and wider environmental operating margins.

Q: Are the Nexperia 74HC32D,653 and 74HC32D-Q100,118 parts compatible with SN74HC32D? A: Yes, both are functionally compatible. They maintain the same logic function, supply voltage, and output current specifications. The 74HC32D-Q100,118 variant includes AEC-Q100 automotive qualification and is suitable for automotive applications. Both offer extended temperature range to 125°C.

Q: Why does 74HC32S14-13 have a higher quiescent current specification (20µA)? A: The 74HC32S14-13 from Diodes Incorporated is functionally equivalent but has a relaxed quiescent current specification. It remains suitable for applications where quiescent current is not a critical design constraint. For power-sensitive designs, prefer alternatives with 1µA to 2µA quiescent current.

Q: Can TC74HC32AF(EL,F) be used in place of SN74HC32D? A: Yes, with PCB footprint verification. TC74HC32AF(EL,F) is functionally equivalent with superior propagation delay (13ns). However, it uses a 14-SOP package with 0.209" body width compared to the standard 14-SOIC at 0.154" width. Confirm PCB layout compatibility before substitution.

Q: Is NLV74HC32ADR2G still available for new designs? A: No. NLV74HC32ADR2G is obsolete. Use active alternatives: MC74HC32ADR2G or MC74HC32ADG from onsemi for equivalent or superior performance.

Q: What are the key parameters that determine if a part can substitute for SN74HC32D? A: The critical parameters are: 4-channel 2-input OR gate logic function, 2V to 6V supply voltage range, 14-SOIC or compatible 14-SO package, surface mount mounting type, and propagation delay of 17ns or faster at 6V with 50pF load. Parts meeting these criteria are electrically interchangeable.

Q: Can I use parts with extended temperature range (-55°C to 125°C) in applications only requiring -40°C to 85°C? A: Yes. Extended temperature range parts are backward compatible with narrower temperature requirements. They provide additional design margin and future flexibility without compromising performance in standard temperature applications.

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