MM74HC32MTC Equivalent & Substitute Parts

Part Overview

The MM74HC32MTC is a 4-channel OR gate logic IC manufactured by onsemi in 14-TSSOP surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MM74HC32MTC belongs to the 74HC logic family and provides standard OR gate functionality with dual-input channels across four independent circuits. Substitute parts must maintain electrical compatibility across supply voltage, logic levels, propagation delay, and thermal operating ranges while accommodating different packaging and product status options.

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-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM74HC32MTC is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

Logic type (OR Gate), circuit count (4), and input count (2) must be identical
Supply voltage range must encompass or match 2V ~ 6V
Output current capability must meet or exceed 5.2mA for both high and low states
Input logic levels must be compatible with the specified thresholds
Propagation delay at 6V with 50pF load must not exceed 17ns for direct substitution
Operating temperature range must support the application requirements
Package type must be 14-TSSOP or compatible surface mount variant
RoHS3 compliance and MSL 1 rating must be maintained

Substitute parts are grouped into three categories based on their relationship to the main part: direct equivalents (identical electrical and package specifications), similar parts (equivalent electrical performance with different packaging or product status), and compatible alternatives (meeting core functional requirements with minor parameter variations).

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage Supply	Quiescent Current (Max)	Propagation Delay @ 6V, 50pF	Operating Temperature	Package Type	Packaging Format
MM74HC32MTC	onsemi	Obsolete	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-TSSOP	Tube
MC74HC32ADTR2G	onsemi	Active	2V ~ 6V	1 µA	13ns	-55°C ~ 125°C	14-TSSOP	Cut Tape (CT) & Digi-Reel®
SN74HC32PW	Texas Instruments	Discontinued at DiGi Electronics	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-TSSOP	Tube
SN74HC32PWR	Texas Instruments	Active	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-TSSOP	Cut Tape (CT) & Digi-Reel®
SN74HC32PWT	Texas Instruments	Discontinued at DiGi Electronics	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-TSSOP	Cut Tape (CT) & Digi-Reel®
74HC32PW,118	Nexperia USA Inc.	Active	2V ~ 6V	2 µA	15ns	-40°C ~ 125°C	14-TSSOP	Tape & Reel (TR)
74HC32PW-Q100,118	Nexperia USA Inc.	Active	2V ~ 6V	2 µA	15ns	-40°C ~ 125°C	14-TSSOP	Tape & Reel (TR)
SN74HC32APWR	Texas Instruments	Active	2V ~ 6V	2 µA	13ns	-40°C ~ 85°C	14-TSSOP	Tape & Reel (TR)
SN74HC32DBR	Texas Instruments	Active	2V ~ 6V	2 µA	17ns	-40°C ~ 85°C	14-SSOP	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

MC74HC32ADTR2G (onsemi) is the preferred substitute for the obsolete MM74HC32MTC. This part maintains onsemi manufacturer continuity, offers active product status with extended availability, and provides improved electrical performance with lower quiescent current (1 µA vs. 2 µA) and faster propagation delay (13ns vs. 17ns). The extended operating temperature range (-55°C ~ 125°C) accommodates broader application requirements. Packaging format is Cut Tape & Digi-Reel®, suitable for automated assembly processes.

SN74HC32PWR (Texas Instruments) is an active substitute with identical electrical specifications to the MM74HC32MTC, including matching quiescent current and propagation delay. This part provides continuity for designs already qualified to Texas Instruments 74HC32 variants and is available in Cut Tape & Digi-Reel® format for production environments.

Secondary Substitutes (Compatible Alternatives):

74HC32PW,118 and 74HC32PW-Q100,118 (Nexperia USA Inc.) are active parts with improved propagation delay (15ns) and extended operating temperature range (-40°C ~ 125°C). The Q100 variant includes AEC-Q100 automotive qualification. These parts are supplied in Tape & Reel format and represent current-generation alternatives with enhanced performance characteristics.

SN74HC32APWR (Texas Instruments) offers faster propagation delay (13ns) and active product status. Input logic level specifications differ slightly (0.1V ~ 0.26V for low, 1.9V ~ 5.9V for high), requiring verification against specific application requirements.

Package Variant:

SN74HC32DBR (Texas Instruments) is functionally equivalent but uses 14-SSOP packaging (0.209", 5.30mm width) instead of 14-TSSOP. This variant is suitable only for designs where SSOP footprint compatibility exists.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MM74HC32MTC with MC74HC32ADTR2G?

A: Yes. Both parts are 4-channel OR gates in 14-TSSOP packaging with identical logic functionality. MC74HC32ADTR2G meets all electrical requirements of MM74HC32MTC with improved performance (lower quiescent current, faster propagation delay) and active product status. The primary difference is packaging format (Cut Tape & Digi-Reel® vs. Tube), which affects procurement and handling but not electrical compatibility.

Q: What is the difference between 14-TSSOP and 14-SSOP packages?

A: Both are surface mount packages with 14 pins, but differ in physical dimensions. 14-TSSOP has a 0.173" width (4.40mm), while 14-SSOP has a 0.209" width (5.30mm). PCB footprints are not interchangeable. SN74HC32DBR in 14-SSOP packaging requires a different PCB layout and cannot be used as a direct drop-in replacement for 14-TSSOP designs.

Q: Why do some substitutes have faster propagation delays?

A: Propagation delay varies based on manufacturing process technology and design optimization. MC74HC32ADTR2G (13ns), SN74HC32APWR (13ns), and Nexperia parts (15ns) represent newer or optimized designs compared to the original MM74HC32MTC (17ns). Faster propagation delay is a performance improvement and does not affect backward compatibility in most applications.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory requirements of the MM74HC32MTC.

Q: What is the difference between Tube, Cut Tape & Digi-Reel®, and Tape & Reel packaging formats?

A: Tube packaging is used for manual handling and small-quantity orders. Cut Tape & Digi-Reel® provides individual tape segments on reels for semi-automated assembly. Tape & Reel (TR) supplies continuous tape on reels for fully automated pick-and-place equipment. Selection depends on production volume and assembly process capabilities. Electrical performance is identical across all packaging formats.

Q: Can I use SN74HC32APWR if my application requires the exact input logic levels of MM74HC32MTC?

A: No. SN74HC32APWR specifies different input logic levels (0.1V ~ 0.26V for low, 1.9V ~ 5.9V for high) compared to MM74HC32MTC (0.5V ~ 1.8V for low, 1.5V ~ 4.2V for high). Verify that your signal conditioning and driver circuits are compatible with the alternative thresholds before substitution.

Q: Is the 74HC32PW-Q100,118 suitable for automotive applications?

A: Yes. The Q100 designation indicates AEC-Q100 qualification, which is the automotive industry standard for integrated circuits. This part is suitable for automotive-grade designs requiring enhanced reliability and qualification documentation.

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