MM74HC573N D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The MM74HC573N is a D-Type Transparent Latch IC manufactured by onsemi, featuring an 8:8 circuit configuration with tri-state output in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74HC573 logic family provides octal latch functionality suitable for data storage and bus interface applications across industrial and commercial systems.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM74HC573N
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Propagation Delay	15ns
Output Current (High/Low)	7.8mA / 7.8mA
Operating Temperature	-40°C ~ 85°C
Package Type	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC573N is determined by the following critical parameters:

Logic Type & Circuit Configuration: All substitutes must maintain D-Type Latch/Transparent Latch functionality with 8:8 circuit configuration
Output Type: Tri-state output is mandatory for bus interface compatibility
Voltage Supply Range: All substitutes operate within 2V ~ 6V supply specification
Package & Mounting: 20-DIP through-hole package with 0.300" (7.62mm) pitch is required for PCB compatibility
Output Current Capability: 7.8mA output current (high and low) must be maintained
Independent Circuits: Single channel configuration (1 circuit) is standard across all parts

Substitutes are categorized into two groups:

Direct Substitutes (MM74HC573 Base Product): Parts sharing the identical base product number 74HC573, including CD74HC573E and SN74HC573AN. These provide functional equivalence with potential variations in propagation delay and temperature rating.

Parametric Equivalents (74HC373 Base Product): Parts with base product number 74HC373 (TC74HC373APF, SN74HC373AN, SN74HC373N, TC74HC373APF) provide equivalent latch functionality with identical electrical and mechanical specifications. The 373 variant represents an alternative latch architecture within the same logic family.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay (ns)	Output Current (mA)	Operating Temp (°C)	Package	Product Status
MM74HC573N	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15	7.8 / 7.8	-40 ~ 85	20-DIP	Obsolete
CD74HC573E	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	30	7.8 / 7.8	-55 ~ 125	20-DIP	Active
CD74HC373E	Harris Corporation	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	30	7.8 / 7.8	-55 ~ 125	20-DIP	Obsolete
SN74HC573AN	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	23	7.8 / 7.8	-40 ~ 85	20-DIP	Active
TC74HC573APF	Toshiba Semiconductor and Storage	D-Type Latch	8:8	Tri-State	2V ~ 6V	17	7.8 / 7.8	-40 ~ 85	20-DIP	Active
SN74HC373AN	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	12	7.8 / 7.8	-40 ~ 85	20-DIP	Active
SN74HC373N	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	15	7.8 / 7.8	-40 ~ 85	20-DIP	Active
TC74HC373APF	Toshiba Semiconductor and Storage	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	12	7.8 / 7.8	-40 ~ 85	20-DIP	Active

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

SN74HC573AN (Texas Instruments) and TC74HC573APF (Toshiba) are direct functional replacements with active product status. SN74HC573AN provides propagation delay of 23ns with RoHS3 compliance. TC74HC573APF offers 17ns propagation delay with RoHS3 compliance and MSL rating of 1 (Unlimited), matching the original part's moisture sensitivity classification.

Extended Compatibility (Parametric Equivalents)

SN74HC373N and SN74HC373AN (Texas Instruments) and TC74HC373APF (Toshiba) provide parametric equivalence with identical electrical specifications. SN74HC373N matches the original 15ns propagation delay with active status and RoHS3 compliance. TC74HC373APF (373 variant) delivers 12ns propagation delay with active status and MSL 1 rating.

Temperature Range Consideration

CD74HC573E (Texas Instruments) extends operating temperature to -55°C ~ 125°C with active status and RoHS3 compliance, suitable for applications requiring expanded thermal performance. Propagation delay is 30ns.

Compliance & Regulatory Status

All active substitutes maintain REACH Unaffected status and EAR99 ECCN classification. RoHS3 compliance is available across Texas Instruments and Toshiba variants. CD74HC373E (Harris Corporation) is marked RoHS non-compliant and obsolete, limiting suitability for new designs.

Frequently Asked Questions (FAQ)

Q: Can SN74HC373N replace MM74HC573N directly?

A: Yes. Both parts share identical electrical parameters (2V ~ 6V supply, 7.8mA output current, -40°C ~ 85°C operating range, 20-DIP package) and propagation delay (15ns). SN74HC373N has active product status and RoHS3 compliance, making it suitable for direct substitution in existing designs.

Q: What is the difference between 74HC573 and 74HC373 variants?

A: Both are octal D-Type latches with 8:8 configuration and tri-state output. The primary distinction is internal latch architecture. Functionally, they are equivalent for most applications when electrical parameters match. Verify specific control signal timing requirements in application schematics before substitution.

Q: Does propagation delay variation affect substitutability?

A: Propagation delay differences (12ns to 30ns across substitutes) are within the 74HC logic family specification. Selection depends on system timing requirements. For timing-critical applications, verify setup and hold time margins with the specific substitute part's datasheet.

Q: Are all substitutes available in the same 20-DIP package?

A: Yes. All listed substitutes use 20-DIP (0.300", 7.62mm) through-hole packaging, ensuring PCB footprint compatibility without layout modifications.

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

A: Texas Instruments SN74HC573AN and SN74HC373N, and Toshiba TC74HC573APF and TC74HC373APF all maintain active product status with high inventory levels, providing reliable long-term sourcing.

Q: Are RoHS certifications consistent across substitutes?

A: Most active substitutes (Texas Instruments and Toshiba variants) are RoHS3 compliant. CD74HC373E (Harris) is RoHS non-compliant and obsolete. Verify compliance requirements for your application before final selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message