SN74AHC573DW Equivalent & Substitute Parts

Part Overview

The SN74AHC573DW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring 1 channel with 8:8 circuit configuration and tri-state output capability. This 20-SOIC surface mount device operates across a 2V to 5.5V supply voltage range with 1ns propagation delay and 8mA output current capacity. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active inventory to maintain design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Logic Type	D-Type Transparent Latch
Circuit Configuration	8:8
Output Type	Tri-State
Voltage - Supply	2V ~ 5.5V
Independent Circuits	1
Delay Time - Propagation	1ns
Current - Output High, Low	8mA, 8mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SN74AHC573DW is determined by strict alignment across the following critical parameters: Logic Type (D-Type Transparent Latch), Circuit Configuration (8:8), Output Type (Tri-State), Supply Voltage Range (2V ~ 5.5V), Independent Circuits (1), Output Current (8mA minimum for both high and low states), Package Type (20-SOIC), and Mounting Type (Surface Mount). Parts meeting these electrical and mechanical specifications are classified as direct substitutes. Parts with identical electrical performance but different propagation delay characteristics or extended operating temperature ranges are classified as upgrades. Parts with parametrically equivalent functionality but different base product numbers are classified as parametric equivalents.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuit	Output Type	Voltage Supply	Propagation Delay	Output Current (High/Low)	Operating Temp	Package	Product Status	MSL
SN74AHC573DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	1ns	8mA, 8mA	-40°C ~ 85°C	20-SOIC	Discontinued	1
SN74AHC573DWR	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	1ns	8mA, 8mA	-40°C ~ 85°C	20-SOIC	Active	1
74VHC573M	Fairchild Semiconductor	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	Not specified	8mA, 8mA	-40°C ~ 85°C	20-SOIC	Active	1
MC74VHC573DWR2G	onsemi	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	5ns	8mA, 8mA	-40°C ~ 85°C	20-SOIC	Active	3
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	1
74AHC573D-Q100J	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	1
SN74AHC373DW	Texas Instruments	D-Type Transparent Latch	8:8	Tri-State	2V ~ 5.5V	1ns	8mA, 8mA	-40°C ~ 85°C	20-SOIC	Last Time Buy	1

Engineering Selection Recommendations

Direct Substitute (Preferred): SN74AHC573DWR from Texas Instruments is the primary direct substitute, offering identical electrical specifications and propagation delay performance with active product status and standard Cut Tape & Digi-Reel packaging. This part maintains full compatibility with the original SN74AHC573DW design requirements.

Direct Substitute (Alternative): 74VHC573M from Fairchild Semiconductor meets all critical electrical and mechanical parameters with active product status. This part is available in bulk packaging and provides equivalent functionality.

Direct Substitute (Cross-Manufacturer): MC74VHC573DWR2G from onsemi satisfies all core electrical specifications and package requirements with active status. Note that propagation delay is specified at 5ns compared to the original 1ns, and MSL rating is 3 (168 Hours) versus the original MSL 1 (Unlimited). These differences require design verification for timing-critical applications and moisture-sensitive assembly environments.

Upgrade Option: 74AHC573D,118 from Nexperia USA Inc. provides extended operating temperature range (-40°C ~ 125°C) compared to the original (-40°C ~ 85°C), with active product status and MSL 1 rating. Propagation delay is 3.9ns. This part is suitable for applications requiring higher temperature operation.

Automotive-Qualified Upgrade: 74AHC573D-Q100J from Nexperia USA Inc. offers AEC-Q100 automotive qualification with extended temperature range (-40°C ~ 125°C) and active product status. This part is specified for automotive applications requiring formal qualification documentation.

Parametric Equivalent (Limited Availability): SN74AHC373DW from Texas Instruments is a parametric equivalent with identical electrical performance and propagation delay. However, this part has Last Time Buy status and uses a different base product number (74AHC373 versus 74AHC573), indicating potential future discontinuation.

Frequently Asked Questions (FAQ)

Q: Can SN74AHC573DWR be used as a direct replacement for SN74AHC573DW?

A: Yes. SN74AHC573DWR is a direct substitute with identical electrical specifications, propagation delay (1ns), output current (8mA), supply voltage range (2V ~ 5.5V), operating temperature (-40°C ~ 85°C), and 20-SOIC package. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and active product status.

Q: What is the difference between 74VHC573M and SN74AHC573DW?

A: Both parts share identical logic type, circuit configuration (8:8), output type (tri-state), supply voltage, output current, and package specifications. The 74VHC573M is manufactured by Fairchild Semiconductor and available in bulk packaging with active status. Propagation delay specifications are not provided for the 74VHC573M in the available data.

Q: Why does MC74VHC573DWR2G have a higher MSL rating?

A: MC74VHC573DWR2G is rated MSL 3 (168 Hours) compared to the original MSL 1 (Unlimited). MSL rating indicates moisture sensitivity during storage and handling. MSL 3 requires more stringent moisture control during assembly and has a shorter shelf life window. This difference is significant for applications with extended storage periods or high-humidity environments.

Q: Should I use 74AHC573D,118 if my application requires higher temperature operation?

A: 74AHC573D,118 extends the operating temperature range to -40°C ~ 125°C compared to the original -40°C ~ 85°C. This part is suitable for applications requiring operation above 85°C. Propagation delay is 3.9ns versus the original 1ns; timing-critical designs must verify this difference does not impact system performance.

Q: What is the significance of AEC-Q100 qualification on 74AHC573D-Q100J?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. The 74AHC573D-Q100J is suitable for automotive applications requiring formal qualification documentation. This part also provides extended operating temperature range (-40°C ~ 125°C) and active product status.

Q: Can I use SN74AHC373DW as a substitute?

A: SN74AHC373DW is a parametric equivalent with identical electrical performance and 1ns propagation delay. However, this part uses a different base product number (74AHC373 versus 74AHC573) and has Last Time Buy status, indicating potential future discontinuation. Use only if other active alternatives are unavailable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the compliance status of the original SN74AHC573DW.

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