74ACT373MSAX Equivalent & Substitute Parts

Part Overview

The 74ACT373MSAX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output capability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP surface mount package.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	4.5V ~ 5.5V
Independent Circuits	1
Delay Time - Propagation	8ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT373MSAX is determined by strict alignment with the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.5V ~ 5.5V
Independent Circuits: 1
Output Current Capability: 24mA (High and Low)
Operating Temperature Range: -40°C ~ 85°C
Mounting Type: Surface Mount
Base Product Number: 74ACT373

Substitute parts must maintain compatibility across all electrical specifications. Package variations (SSOP vs. TSSOP) are permissible when mechanical constraints allow, provided the pin count and functional pinout remain identical.

Parameter Comparison

Parameter	74ACT373MSAX (onsemi)	SN74ACT373DBR (TI)	SN74ACT373PW (TI)	SN74ACT373PWR (TI)
Logic Type	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch	D-Type Transparent Latch
Circuit Configuration	8:8	8:8	8:8	8:8
Output Type	Tri-State	Tri-State	Tri-State	Tri-State
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Independent Circuits	1	1	1	1
Delay Time - Propagation	8ns	8.5ns	8.5ns	8.5ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)	20-SSOP (0.209", 5.30mm Width)	20-TSSOP (0.173", 4.40mm Width)	20-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74ACT373DBR (Texas Instruments) is the primary substitute for the 74ACT373MSAX. This part maintains identical package geometry (20-SSOP), carries Active product status, and holds ROHS3 compliance certification. The propagation delay specification of 8.5ns is marginally higher than the original 8ns but remains within acceptable operational parameters for most applications.

SN74ACT373PWR (Texas Instruments) serves as an alternative substitute with Active product status and ROHS3 compliance. This part utilizes a 20-TSSOP package with reduced width (4.40mm vs. 5.30mm), suitable for space-constrained designs. The electrical specifications remain equivalent to SN74ACT373DBR.

SN74ACT373PW (Texas Instruments) is available but carries Discontinued at DiGi Electronics status, limiting long-term supply reliability. This part features the same 20-TSSOP package as SN74ACT373PWR and maintains equivalent electrical performance.

Selection between SN74ACT373DBR and SN74ACT373PWR should be based on available printed circuit board layout space and packaging requirements. Both parts provide equivalent electrical functionality and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT373PWR replace 74ACT373MSAX directly on the PCB?

A: SN74ACT373PWR is electrically equivalent but uses a 20-TSSOP package (4.40mm width) versus the original 20-SSOP package (5.30mm width). Direct footprint compatibility depends on PCB layout design. If the original footprint accommodates the narrower TSSOP package, substitution is feasible. Otherwise, PCB redesign is required.

Q: What is the significance of the propagation delay difference between 8ns and 8.5ns?

A: The 0.5ns difference falls within typical manufacturing tolerances and does not affect functional compatibility in standard logic applications. Timing-critical designs operating near maximum frequency specifications should evaluate this parameter against system requirements.

Q: Are all substitute parts RoHS compliant?

A: SN74ACT373DBR, SN74ACT373PW, and SN74ACT373PWR all carry ROHS3 compliance certification. The original 74ACT373MSAX RoHS status is not specified in available documentation.

Q: Which substitute offers the best long-term availability?

A: SN74ACT373DBR and SN74ACT373PWR both carry Active product status from Texas Instruments, providing superior long-term supply assurance compared to the obsolete 74ACT373MSAX or the discontinued SN74ACT373PW.

Q: Do package differences affect electrical performance?

A: No. The 20-SSOP and 20-TSSOP packages are functionally equivalent for this logic IC. Package selection is determined by PCB layout constraints and mechanical requirements, not electrical performance.

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