74AC573PC D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74AC573PC is a D-Type Transparent Latch logic integrated circuit manufactured by onsemi, featuring an 8:8 channel configuration with tri-state output capability. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. The part operates across a 2V to 6V supply voltage range and is housed in a 20-DIP through-hole package suitable for legacy and industrial applications.

Key Parameters

Parameter	Specification
Manufacturer Part Number	74AC573PC
Manufacturer	onsemi
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	2V ~ 6V
Independent Circuits	1
Delay Time - Propagation	8.5ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74AC573PC is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Package / Case: 20-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Independent Circuits: 1

Allowable Parameter Variations:

Voltage - Supply: Must encompass or match the 2V ~ 6V range
Delay Time - Propagation: May vary within acceptable timing margins
Operating Temperature: May extend beyond -40°C ~ 85°C
Current - Output High, Low: Must meet or exceed 24mA specification
Product Status: Active or Obsolete status does not restrict substitution
Compliance Certifications: RoHS and REACH status may differ

All substitute parts listed maintain identical functional architecture and pinout compatibility with the 74AC573PC.

Parameter Comparison

Parameter	74AC573PC (onsemi)	CD74AC573E (Harris)	SN74AC573N (TI)	SN74AC373N (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	2V ~ 6V	1.5V ~ 5.5V	2V ~ 6V	2V ~ 6V
Delay Time - Propagation	8.5ns	3ns	2.5ns	7.5ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active
RoHS Status	Not specified	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74AC573N (Texas Instruments) is the primary substitute for new designs and production continuity. This part maintains identical voltage supply and operating temperature specifications as the 74AC573PC, features faster propagation delay (2.5ns), and holds Active product status with ROHS3 compliance certification. Current availability is 2,740 units.

SN74AC373N (Texas Instruments) serves as a parametric equivalent with Active product status and ROHS3 compliance. Propagation delay is 7.5ns, closely matching the original 8.5ns specification. This part is suitable for applications where timing margins are non-critical. Current availability is 3,200 units.

CD74AC573E (Harris Corporation) is functionally compatible but carries Obsolete product status and RoHS non-compliance designation. This part features superior propagation delay (3ns) and extended operating temperature range (-55°C ~ 125°C), making it suitable for legacy system maintenance where compliance certifications are not required. Current availability is 1,632 units.

Frequently Asked Questions (FAQ)

Q: Can SN74AC573N directly replace 74AC573PC without circuit modification?

A: Yes. Both parts share identical logic type, circuit configuration, output type, package, and mounting specifications. The faster propagation delay (2.5ns vs. 8.5ns) improves timing performance without requiring design changes.

Q: What is the difference between SN74AC573N and SN74AC373N?

A: Both are D-Type Transparent Latch 8:8 tri-state devices in 20-DIP packages. The primary difference is propagation delay: SN74AC573N operates at 2.5ns while SN74AC373N operates at 7.5ns. Selection depends on timing requirements of the application.

Q: Is CD74AC573E suitable for new production?

A: CD74AC573E is functionally compatible but carries RoHS non-compliance status and Obsolete product status. It is appropriate for legacy system maintenance and repair where compliance certifications are not mandated. For new designs, SN74AC573N or SN74AC373N are recommended.

Q: Are all substitute parts pin-compatible with 74AC573PC?

A: Yes. All listed substitutes maintain the 20-DIP (0.300", 7.62mm) package and through-hole mounting configuration, ensuring direct pin-for-pin compatibility.

Q: What voltage range do these parts support?

A: 74AC573PC, SN74AC573N, and SN74AC373N all operate within 2V ~ 6V supply voltage. CD74AC573E operates within 1.5V ~ 5.5V, providing slightly lower minimum voltage capability.

Q: Do all substitutes provide the same output current capability?

A: Yes. All parts deliver 24mA output current for both high and low states, meeting the original specification.

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