SN74AC32MDREP Equivalent & Substitute Parts

Part Overview

The SN74AC32MDREP is a 4-channel 2-input OR gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This device is classified as an active product and is widely used in digital logic applications requiring OR gate functionality. Equivalent and substitute parts are identified based on matching electrical characteristics, package specifications, and operational parameters to ensure direct functional compatibility in circuit designs.

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	24mA, 24mA
Input Logic Level - Low	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V
Max Propagation Delay @ 5V, 50pF	7.5ns
Operating Temperature	-55°C ~ 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AC32MDREP are qualified based on the following criteria:

Electrical Compatibility: All substitute parts maintain identical logic type (OR Gate), circuit count (4 channels), input count (2 inputs per channel), supply voltage range (2V ~ 6V), output current specifications (24mA, 24mA), input logic levels, and propagation delay characteristics (7.5ns @ 5V, 50pF).

Package Compatibility: All substitute parts use the 14-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm Width), ensuring direct PCB footprint compatibility.

Regulatory Compliance: All parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status.

Key Differentiators: Substitutes vary in manufacturer (onsemi vs. Texas Instruments), packaging format (Tape & Reel, Cut Tape & Digi-Reel, or Tube), quiescent current specifications (2 µA or 4 µA), and operating temperature range (-55°C ~ 125°C for main part vs. -40°C ~ 85°C for substitutes).

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Output Current (H/L)	Propagation Delay	Operating Temp	Package	Packaging Format
SN74AC32MDREP	Texas Instruments	OR Gate	4 / 2	2V ~ 6V	2 µA	24mA, 24mA	7.5ns @ 5V, 50pF	-55°C ~ 125°C	14-SOIC	Tape & Reel (TR)
MC74AC32DR2G	onsemi	OR Gate	4 / 2	2V ~ 6V	4 µA	24mA, 24mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Cut Tape (CT) & Digi-Reel®
74AC32SCX	onsemi	OR Gate	4 / 2	2V ~ 6V	2 µA	24mA, 24mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Cut Tape (CT) & Digi-Reel®
MC74AC32DG	onsemi	OR Gate	4 / 2	2V ~ 6V	4 µA	24mA, 24mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Tube

Engineering Selection Recommendations

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

MC74AC32DR2G (onsemi): Direct substitute with Cut Tape & Digi-Reel packaging. Quiescent current specification is 4 µA (higher than main part). Operating temperature range is -40°C ~ 85°C, narrower than the main part's -55°C ~ 125°C range. Suitable for applications within the specified temperature limits.

74AC32SCX (onsemi): Direct substitute with Cut Tape & Digi-Reel packaging. Quiescent current specification matches the main part at 2 µA. Operating temperature range is -40°C ~ 85°C. Provides closest electrical match to the main part within the narrower temperature range.

MC74AC32DG (onsemi): Direct substitute with Tube packaging. Quiescent current specification is 4 µA. Operating temperature range is -40°C ~ 85°C. Suitable for applications within the specified temperature limits.

Selection between substitutes depends on packaging format requirements (reel, tape, or tube), quiescent current constraints, and operating temperature range specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can MC74AC32DR2G replace SN74AC32MDREP in all applications?

A: MC74AC32DR2G is electrically compatible for logic function and output characteristics. However, the operating temperature range differs (-40°C ~ 85°C vs. -55°C ~ 125°C). Verify that your application operates within the -40°C ~ 85°C range. Quiescent current is 4 µA versus 2 µA for the main part.

Q: What is the difference between 74AC32SCX and MC74AC32DR2G?

A: Both are onsemi 74AC32 OR gate ICs in 14-SOIC packages. 74AC32SCX has 2 µA quiescent current (matching the main part), while MC74AC32DR2G has 4 µA. Both share the same -40°C ~ 85°C operating temperature range. Packaging differs: 74AC32SCX uses Cut Tape & Digi-Reel format, while MC74AC32DR2G uses Cut Tape & Digi-Reel format as well.

Q: Are all substitutes pin-compatible with the SN74AC32MDREP?

A: Yes. All substitute parts use the 14-SOIC package with identical pinout and physical dimensions (0.154", 3.90mm Width), ensuring direct PCB footprint compatibility without layout modifications.

Q: Does packaging format affect electrical performance?

A: No. Tape & Reel, Cut Tape & Digi-Reel, and Tube packaging formats are distribution methods only and do not affect electrical characteristics or performance of the logic IC.

Q: Which substitute has the lowest quiescent current?

A: 74AC32SCX and SN74AC32MDREP both specify 2 µA maximum quiescent current. MC74AC32DR2G and MC74AC32DG specify 4 µA maximum quiescent current.

Q: Can I use these substitutes in high-temperature applications above 85°C?

A: No. All onsemi substitutes (MC74AC32DR2G, 74AC32SCX, MC74AC32DG) are rated for -40°C ~ 85°C maximum operating temperature. For applications requiring -55°C ~ 125°C operation, the SN74AC32MDREP (Texas Instruments) is the appropriate choice.

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