74AC573SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC573SCX is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 20-SOIC package provides surface mount integration for logic applications requiring transparent latch functionality with specified electrical performance characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	74AC573SCX
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage Supply Range	2V ~ 6V
Delay Time - Propagation	8.5ns
Current Output High/Low	24mA / 24mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 74AC573SCX are classified based on electrical and mechanical compatibility within the following parameter constraints:

Primary Substitution Criteria:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Package / Case: 20-SOIC form factor
Mounting Type: Surface Mount
Voltage Supply Range: Minimum 2V support required
Current Output: 24mA capability maintained
Operating Temperature: Minimum -40°C to 85°C range

Substitution Categories:

Direct Manufacturer Equivalents (onsemi): Parts maintaining identical electrical specifications with active product status and improved packaging options.

Direct Manufacturer Equivalents (Texas Instruments): Parts meeting core electrical parameters with enhanced performance characteristics and active product status.

Similar Manufacturer Parts (Nexperia USA Inc.): Parts with compatible logic function and package, featuring different series designation (74AHC) with modified electrical parameters within acceptable tolerance.

Parametric Equivalents: Parts with identical package and mounting but different base product number (74AC373 vs 74AC573), maintaining functional compatibility through equivalent circuit topology.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Current Output (H/L)	Operating Temp	Package	Product Status	RoHS Status
74AC573SCX	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	8.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Obsolete	N/A
MC74AC573DWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	10ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
MC74AC573DWG	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	10ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
CD74AC573M96	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA / 24mA	-55°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant
74AHC573D,118	Nexperia USA Inc.	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	3.9ns	8mA / 8mA	-40°C ~ 125°C	20-SOIC	Active	ROHS3 Compliant
CD74AC573M	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	1.5V ~ 5.5V	3ns	24mA / 24mA	-55°C ~ 125°C	20-SOIC	Last Time Buy	ROHS3 Compliant
SN74AC573DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74AC573DWG4	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74AC573DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
SN74AC573NSR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	2.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant
SN74AC373DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 6V	7.5ns	24mA / 24mA	-40°C ~ 85°C	20-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production (Recommended Priority):

MC74AC573DWR2G and MC74AC573DWG (onsemi) provide direct electrical equivalence to the 74AC573SCX with active product status. Both maintain identical voltage supply range, output current specifications, and operating temperature range. MC74AC573DWR2G offers tape and reel packaging; MC74AC573DWG provides tube packaging. Both are ROHS3 compliant with MSL-3 moisture sensitivity rating.

SN74AC573DWR (Texas Instruments) delivers active product status with identical electrical parameters and ROHS3 compliance. This part features cut tape and Digi-Reel packaging with 2.5ns propagation delay, meeting or exceeding the original 8.5ns specification.

For Extended Temperature Range Applications:

CD74AC573M96 (Texas Instruments) expands operating temperature to -55°C ~ 125°C while maintaining 24mA output current and ROHS3 compliance. Supply voltage range extends to 1.5V minimum with 3ns propagation delay. Active product status ensures long-term availability.

For Lower Output Current Applications:

74AHC573D,118 (Nexperia USA Inc.) operates within 2V ~ 5.5V supply range with reduced output current (8mA / 8mA). This part maintains active product status and ROHS3 compliance with extended operating temperature to 125°C. Suitable for applications where lower drive current is acceptable.

Parts to Avoid for New Designs:

CD74AC573M carries Last Time Buy status. SN74AC573DW and SN74AC573DWG4 are discontinued at DiGi Electronics and unsuitable for new production designs.

Frequently Asked Questions (FAQ)

Q: Can MC74AC573DWR2G directly replace 74AC573SCX in existing designs?

A: Yes. MC74AC573DWR2G maintains identical voltage supply range (2V ~ 6V), output current (24mA / 24mA), operating temperature (-40°C ~ 85°C), and 20-SOIC package. Propagation delay increases from 8.5ns to 10ns, which remains within acceptable logic timing for most applications. ROHS3 compliance and active product status support production continuity.

Q: What is the difference between MC74AC573DWR2G and MC74AC573DWG?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging: MC74AC573DWR2G is supplied in tape and reel format for automated assembly; MC74AC573DWG is supplied in tube format for manual handling. Select based on assembly process requirements.

Q: Why does SN74AC573DWR show faster propagation delay (2.5ns vs 8.5ns)?

A: Propagation delay variation reflects manufacturing process differences between onsemi and Texas Instruments. Faster delay indicates improved performance and does not create compatibility issues. The part remains functionally equivalent for logic applications where timing margins exist.

Q: Is SN74AC573NSR compatible with the original 74AC573SCX?

A: Yes, with package consideration. SN74AC573NSR maintains identical electrical specifications and active product status. The package designation differs (20-SO at 0.209" width vs 20-SOIC at 0.295" width), indicating a narrower body variant. Physical PCB footprint compatibility must be verified before substitution.

Q: Can 74AHC573D,118 replace 74AC573SCX in all applications?

A: 74AHC573D,118 provides functional equivalence with active product status and extended temperature range. However, output current is reduced to 8mA / 8mA compared to the original 24mA specification. Substitution is valid only for applications where lower drive current meets system requirements. Verify load impedance compatibility before implementation.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All active substitute parts listed carry ROHS3 compliance, supporting environmental and regulatory requirements for modern production.

Q: Why is CD74AC573M marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has announced end-of-life for this part number. While currently available, inventory is limited and production will cease. New designs should select from parts with Active status (MC74AC573DWR2G, SN74AC573DWR, or CD74AC573M96) to ensure long-term supply continuity.

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