SN74AHCT573PW Equivalent & Substitute Parts

Part Overview

The SN74AHCT573PW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring an 8:8 circuit configuration with tri-state output capability in a 20-TSSOP surface mount package. This component is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The part operates within a 4.5V to 5.5V supply voltage range and is suitable for applications requiring transparent latch functionality with tri-state output control.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74AHCT573PW
Manufacturer	Texas Instruments
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	1ns
Current - Output High, Low	8mA, 8mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN74AHCT573PW are classified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.5V ~ 5.5V
Package / Case: 20-TSSOP
Mounting Type: Surface Mount
Independent Circuits: 1

Substitution Categories:

Direct Manufacturer Substitutes maintain identical electrical specifications and packaging. These parts are pin-compatible and functionally equivalent with no design modifications required.

Manufacturer Recommended Substitutes from alternative manufacturers (Nexperia USA Inc., onsemi) meet all critical electrical parameters and package requirements. Variations in propagation delay (4.6ns to 5.1ns) and operating temperature ranges remain within acceptable tolerance for most applications using the original part.

Parametric Equivalents share the same base product number series but may have minor functional differences. These require verification of specific circuit requirements before implementation.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Circuit	Output Type	Voltage - Supply	Propagation Delay	Operating Temp	Package	Product Status
SN74AHCT573PW	Texas Instruments	74AHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	1ns	-40°C ~ 85°C	20-TSSOP	Discontinued
SN74AHCT573PWR	Texas Instruments	74AHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	1ns	-40°C ~ 85°C	20-TSSOP	Active
74AHCT573PW,118	Nexperia USA Inc.	74AHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	4.6ns	-40°C ~ 125°C	20-TSSOP	Active
74AHCT573PW-Q100J	Nexperia USA Inc.	74AHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	4.6ns	-40°C ~ 125°C	20-TSSOP	Active
MC74VHCT573ADTG	onsemi	74VHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	5.1ns	-40°C ~ 85°C	20-TSSOP	Active
MC74VHCT573ADTRG	onsemi	74VHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	5.1ns	-40°C ~ 85°C	20-TSSOP	Active
SN74AHCT373PW	Texas Instruments	74AHCT	D-Type Transparent Latch	8:8	Tri-State	4.5V ~ 5.5V	1ns	-40°C ~ 85°C	20-TSSOP	Discontinued

Engineering Selection Recommendations

Primary Recommendation: SN74AHCT573PWR

The SN74AHCT573PWR from Texas Instruments is the direct active substitute for the discontinued SN74AHCT573PW. This part maintains identical electrical specifications, propagation delay (1ns), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus the original tube packaging), which does not affect functional compatibility. This part is currently in active production status with 5200 units in stock.

Secondary Recommendation: 74AHCT573PW,118 or 74AHCT573PW-Q100J (Nexperia USA Inc.)

These Nexperia parts provide active alternatives with extended operating temperature range (-40°C ~ 125°C). The propagation delay increases to 4.6ns, which remains acceptable for most applications. The 74AHCT573PW-Q100J variant includes AEC-Q100 automotive qualification, suitable for automotive-grade applications. Both parts are ROHS3 compliant and maintain the required 20-TSSOP package.

Tertiary Recommendation: MC74VHCT573ADTG or MC74VHCT573ADTRG (onsemi)

The onsemi 74VHCT series parts are functionally equivalent with propagation delay of 5.1ns. These parts are suitable for applications where slightly increased propagation delay is acceptable. The MC74VHCT573ADTRG offers tape and reel packaging for high-volume production. Both maintain ROHS3 compliance and the 20-TSSOP package format.

Not Recommended: SN74AHCT373PW

While listed as a parametric equivalent, the SN74AHCT373PW uses a different base product number (74AHCT373 versus 74AHCT573) and is also discontinued. This part should not be selected as a substitute without explicit circuit verification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74AHCT573PW with SN74AHCT573PWR?

A: Yes. The SN74AHCT573PWR is the active production equivalent of the discontinued SN74AHCT573PW. Both parts share identical electrical specifications, pin configuration, and 20-TSSOP package. The only difference is packaging format (reel versus tube), which does not affect circuit functionality or PCB assembly compatibility.

Q: What is the difference between the 74AHCT and 74VHCT series?

A: Both series are D-Type Transparent Latch logic ICs with identical pin configurations and package formats. The primary difference is propagation delay: 74AHCT series (1ns to 4.6ns) versus 74VHCT series (5.1ns). The 74VHCT series may be suitable for applications where timing margins are less critical. All other electrical parameters, including supply voltage and output current, remain equivalent.

Q: Are the Nexperia parts (74AHCT573PW,118) compatible with the original Texas Instruments part?

A: Yes. The Nexperia 74AHCT573PW,118 maintains all critical electrical parameters: 8:8 circuit configuration, tri-state output, 4.5V to 5.5V supply voltage, and 20-TSSOP package. The propagation delay increases from 1ns to 4.6ns, and the operating temperature range extends to 125°C. These differences are compatible with most applications using the original part.

Q: What does the "Q100J" designation in 74AHCT573PW-Q100J indicate?

A: The Q100J designation indicates AEC-Q100 automotive qualification. This part meets automotive industry reliability and quality standards. If your application requires automotive-grade components, this variant is appropriate. If automotive qualification is not required, the standard 74AHCT573PW,118 variant is functionally equivalent at lower cost.

Q: Can I use these parts interchangeably in my design?

A: All listed substitute parts are pin-compatible and functionally equivalent for the D-Type Transparent Latch 8:8 tri-state logic function. However, verify that propagation delay specifications meet your circuit timing requirements. The 74AHCT series (1ns to 4.6ns) is faster than the 74VHCT series (5.1ns). If your design has tight timing constraints, confirm that the selected substitute meets those requirements.

Q: What packaging options are available?

A: All substitute parts are available in 20-TSSOP surface mount package. Packaging formats differ by supplier: SN74AHCT573PWR is available in Cut Tape & Digi-Reel format; Nexperia parts are available in Tape & Reel format; onsemi MC74VHCT573ADTG is available in Tube format; and MC74VHCT573ADTRG is available in Tape & Reel format. Select the packaging format that matches your procurement and assembly requirements.

Q: Are all these parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and have Moisture Sensitivity Level (MSL) of 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

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