MM74HCT32MTC OR Gate IC Equivalent & Substitute Parts

Part Overview

The MM74HCT32MTC is a 4-channel 2-input 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 MM74HCT32MTC operates within a 4.5V to 5.5V supply voltage range and is suitable for TTL-compatible logic applications requiring OR gate functionality.

Key Parameters

Parameter	Value
Part Number	MM74HCT32MTC
Manufacturer	onsemi
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	4.8mA, 4.8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	20ns @ 5V, 15pF
Operating Temperature	-40°C ~ 85°C
Package / Case	14-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MM74HCT32MTC is determined by the following critical parameters:

Logic type (OR Gate with 4 channels, 2 inputs per channel)
Supply voltage range compatibility (4.5V ~ 5.5V nominal operation)
Input and output logic levels (TTL-compatible thresholds)
Package type (14-TSSOP surface mount)
Propagation delay performance
Operating temperature range
RoHS and compliance certifications

Substitute parts are grouped into three categories:

Similar Parts (MC74HC32ADTR2G, MC74HCT32ADTR2G): onsemi-manufactured alternatives with identical logic function and packaging. MC74HC32ADTR2G operates at wider voltage range (2V ~ 6V) with improved performance characteristics. MC74HCT32ADTR2G maintains 74HCT series specifications with active product status.

Direct Equivalents (SN74HCT32PW, SN74HCT32PWR, SN74HCT32PWT): Texas Instruments 74HCT32 series parts with matching electrical specifications and 14-TSSOP packaging. These maintain identical supply voltage, logic levels, and operating temperature ranges.

Package Variant (SN74HCT32DBR): Texas Instruments equivalent with 14-SSOP packaging instead of 14-TSSOP, maintaining all electrical specifications.

Parameter Comparison

Parameter	MM74HCT32MTC	MC74HC32ADTR2G	MC74HCT32ADTR2G	SN74HCT32PW	SN74HCT32PWR	SN74HCT32PWT	SN74HCT32DBR
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Logic Type	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate	OR Gate
Number of Circuits	4	4	4	4	4	4	4
Number of Inputs	2	2	2	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	2V ~ 6V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	1 µA	1 µA	2 µA	2 µA	2 µA	2 µA
Current - Output High, Low	4.8mA, 4.8mA	5.2mA, 5.2mA	4mA, 4mA	4mA, 4mA	4mA, 4mA	4mA, 4mA	4mA, 4mA
Input Logic Level - Low	0.8V	0.5V ~ 1.8V	0.8V	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	1.5V ~ 4.2V	2V	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	20ns @ 5V, 15pF	13ns @ 6V, 50pF	15ns @ 5V, 50pF	22ns @ 5.5V, 50pF	22ns @ 5.5V, 50pF	22ns @ 5.5V, 50pF	22ns @ 5.5V, 50pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-TSSOP	14-SSOP
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active	Discontinued at DiGi Electronics	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For applications currently using the MM74HCT32MTC, the following selection criteria apply based on product status and compliance:

Primary Recommendation: MC74HCT32ADTR2G (onsemi) or SN74HCT32PWR (Texas Instruments). Both parts maintain active product status, identical electrical specifications to the original part, and ROHS3 compliance. MC74HCT32ADTR2G offers extended operating temperature range (-55°C ~ 125°C) compared to the original -40°C ~ 85°C specification.

Alternative with Enhanced Performance: MC74HC32ADTR2G (onsemi) provides wider supply voltage range (2V ~ 6V) and improved propagation delay (13ns @ 6V, 50pF). This part is suitable for applications requiring broader voltage tolerance and faster switching characteristics, though it operates at different input logic level thresholds.

Package Consideration: SN74HCT32DBR provides identical electrical performance with 14-SSOP packaging instead of 14-TSSOP. This variant is appropriate only if PCB layout accommodates the slightly larger package footprint (0.209" versus 0.173" width).

Avoid: SN74HCT32PW and SN74HCT32PWT are discontinued at DiGi Electronics, limiting long-term procurement viability despite current inventory availability.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can MC74HC32ADTR2G replace MM74HCT32MTC directly?

A: MC74HC32ADTR2G is functionally equivalent for OR gate logic with identical pin configuration and 14-TSSOP packaging. However, it operates at 2V ~ 6V supply voltage with different input logic level thresholds (0.5V ~ 1.8V low, 1.5V ~ 4.2V high) compared to the MM74HCT32MTC specification (0.8V low, 2V high). Direct substitution is valid only if the application circuit tolerates these input threshold differences.

Q: What is the difference between 74HC and 74HCT series?

A: The 74HCT series maintains TTL-compatible input logic levels (0.8V low, 2V high) and operates at 4.5V ~ 5.5V supply voltage. The 74HC series accepts CMOS-level inputs (0.5V ~ 1.8V low, 1.5V ~ 4.2V high) and operates across wider voltage range (2V ~ 6V). Selection depends on whether the driving circuit outputs TTL or CMOS logic levels.

Q: Are 14-TSSOP and 14-SSOP packages interchangeable?

A: Both packages are 14-pin surface mount with identical pinout and electrical function. The primary difference is physical footprint: 14-TSSOP is 0.173" wide, while 14-SSOP is 0.209" wide. PCB layout must accommodate the specific package width. Solder reflow profiles may differ slightly between package types.

Q: Why is the MM74HCT32MTC marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Existing inventory may remain available through distributors, but long-term procurement cannot be guaranteed. Active alternatives such as MC74HCT32ADTR2G and SN74HCT32PWR ensure design continuity and supply chain reliability.

Q: Do all substitute parts meet the same compliance requirements?

A: All listed substitutes are ROHS3 compliant, MSL Level 1, and EAR99 classified, matching the original MM74HCT32MTC compliance profile. Verify specific certifications with the component supplier for applications requiring additional compliance documentation.

Q: What is the impact of propagation delay differences between substitutes?

A: The MM74HCT32MTC specifies 20ns maximum propagation delay at 5V with 15pF load. Substitutes range from 13ns to 22ns depending on manufacturer and test conditions. For timing-critical applications, confirm that the substitute part's propagation delay meets system timing requirements. MC74HC32ADTR2G offers the fastest performance at 13ns.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message