74AC32MTC OR Gate IC Equivalent & Substitute Parts

Part Overview

The 74AC32MTC 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 74AC32 series maintains consistent functional performance across multiple manufacturers and packaging variants, enabling direct substitution based on electrical and mechanical compatibility.

Key Parameters

Parameter	Specification
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	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74AC32MTC is determined by the following criteria:

Electrical Compatibility: All substitute parts maintain identical logic function (4-channel 2-input OR gate), supply voltage range (2V ~ 6V), input/output logic levels, propagation delay (7.5ns @ 5V, 50pF), and operating temperature range (-40°C ~ 85°C).

Mechanical Compatibility: Package type and pin configuration determine physical interchangeability. The 74AC32MTC uses 14-TSSOP packaging. Substitutes are grouped by package type: direct 14-TSSOP equivalents and similar 14-SSOP variants with identical pinout but different package dimensions.

Packaging Variants: Substitute parts are available in multiple packaging formats (Tape & Reel, Cut Tape, Tube) affecting procurement and handling but not electrical performance.

Quiescent Current Variation: The MC74AC32DTR2G specifies 4 µA maximum quiescent current versus 2 µA for other variants. This parameter difference does not prevent substitution in applications where quiescent current tolerance permits the higher specification.

Parameter Comparison

Parameter	74AC32MTC (onsemi)	MC74AC32DTR2G (onsemi)	SN74AC32PWR (TI)	SN74AC32DBR (TI)	SN74AC32PW (TI)
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Discontinued at DiGi Electronics
Package Type	14-TSSOP	14-TSSOP	14-TSSOP	14-SSOP	14-TSSOP
Package Dimensions	0.173" × 4.40mm	0.173" × 4.40mm	0.173" × 4.40mm	0.209" × 5.30mm	0.173" × 4.40mm
Packaging Format	Surface Mount	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tube
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Current - Quiescent (Max)	2 µA	4 µA	2 µA	2 µA	2 µA
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Input Logic Level - Low	0.9V ~ 1.65V	0.9V ~ 1.65V	0.9V ~ 1.65V	0.9V ~ 1.65V	0.9V ~ 1.65V
Input Logic Level - High	2.1V ~ 3.85V	2.1V ~ 3.85V	2.1V ~ 3.85V	2.1V ~ 3.85V	2.1V ~ 3.85V
Max Propagation Delay @ 5V, 50pF	7.5ns	7.5ns	7.5ns	7.5ns	7.5ns
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Substitutes (14-TSSOP Package): MC74AC32DTR2G, SN74AC32PWR, and SN74AC32PW are direct pin-compatible replacements for 74AC32MTC in 14-TSSOP packaging. MC74AC32DTR2G and SN74AC32PWR are active products with current manufacturing support. SN74AC32PW is discontinued at DiGi Electronics but remains available through alternative channels.

Package Variant (14-SSOP): SN74AC32DBR uses 14-SSOP packaging with identical pinout but different physical dimensions (0.209" × 5.30mm versus 0.173" × 4.40mm). This variant requires PCB layout verification for mechanical clearance before substitution.

Compliance & Certification: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical electrical specifications, ensuring regulatory and environmental compatibility with the original 74AC32MTC design.

Quiescent Current Consideration: MC74AC32DTR2G specifies 4 µA maximum quiescent current. Applications with strict power consumption requirements should prioritize alternatives specifying 2 µA maximum quiescent current (SN74AC32PWR, SN74AC32DBR, SN74AC32PW).

Frequently Asked Questions (FAQ)

Q: Can SN74AC32DBR replace 74AC32MTC directly on the PCB? A: SN74AC32DBR has identical pinout and electrical specifications but uses 14-SSOP packaging (0.209" × 5.30mm) instead of 14-TSSOP (0.173" × 4.40mm). Physical footprint verification is required before PCB substitution.

Q: What is the difference between 14-TSSOP and 14-SSOP packaging? A: Both packages contain 14 pins with identical pinout and electrical function. The primary difference is package width: TSSOP is 4.40mm wide, SSOP is 5.30mm wide. PCB footprints are not interchangeable without layout modification.

Q: Is MC74AC32DTR2G a suitable replacement for low-power applications? A: MC74AC32DTR2G specifies 4 µA maximum quiescent current versus 2 µA for other variants. For applications where quiescent current must not exceed 2 µA, select SN74AC32PWR, SN74AC32DBR, or SN74AC32PW instead.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (MC74AC32DTR2G, SN74AC32PWR, SN74AC32DBR, SN74AC32PW) are ROHS3 compliant with MSL Level 1 rating, matching the original 74AC32MTC specifications.

Q: What packaging formats are available for 74AC32 logic ICs? A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, and Tube formats. Packaging format affects procurement and handling but does not impact electrical performance or pin compatibility.

Q: Can I use SN74AC32PW if it is discontinued at DiGi Electronics? A: SN74AC32PW is discontinued at DiGi Electronics but remains available through alternative component distributors. Verify availability and lead time with your supplier before design commitment.

Q: Do all 74AC32 variants operate at the same supply voltage range? A: Yes. All listed parts operate at 2V ~ 6V supply voltage with identical input/output logic levels, propagation delay, and operating temperature range (-40°C ~ 85°C).

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