74ACTQ573QSC Equivalent & Substitute Parts

Part Overview

The 74ACTQ573QSC is a D-Type Transparent Latch logic 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 substitute parts necessary for new designs and ongoing production requirements. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-QSOP surface mount package.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ573QSC
Manufacturer	onsemi
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	6.5ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-QSOP (0.154", 3.90mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74ACTQ573QSC is determined by strict equivalence across the following critical parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Voltage - Supply: 4.5V ~ 5.5V
Independent Circuits: 1
Current - Output High, Low: 24mA, 24mA
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount

All identified substitute parts maintain these core electrical and functional specifications. Package variations (20-SSOP, 20-TSSOP) are permitted as they accommodate the same pin count and electrical performance within the specified operating parameters. Propagation delay differences within the 6ns to 6.5ns range remain within acceptable tolerance for this logic family.

Parameter Comparison

Parameter	74ACTQ573QSC (onsemi)	SN74ACT573DBR (TI)	SN74ACT573PW (TI)	SN74ACT573PWR (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	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Independent Circuits	1	1	1	1
Delay Time - Propagation	6.5ns	6ns	6ns	6ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	20-QSOP (0.154", 3.90mm)	20-SSOP (0.209", 5.30mm)	20-TSSOP (0.173", 4.40mm)	20-TSSOP (0.173", 4.40mm)
Product Status	Obsolete	Active	Discontinued at DiGi Electronics	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74ACT573PWR (Texas Instruments) is the primary recommended substitute. This part maintains active product status with full ROHS3 compliance and unlimited moisture sensitivity rating. The 20-TSSOP package (0.173", 4.40mm width) provides a compact footprint suitable for modern PCB designs. With 10,200 units in stock, supply continuity is assured for production requirements.

SN74ACT573DBR (Texas Instruments) serves as an alternative substitute with active product status and ROHS3 compliance. The 20-SSOP package (0.209", 5.30mm width) offers slightly larger pitch spacing, which may benefit designs with less stringent board density requirements. Inventory of 3,130 units supports medium-volume applications.

SN74ACT573PW (Texas Instruments) is listed as discontinued at DiGi Electronics, limiting its suitability for new production designs despite technical equivalence. This part should be considered only for legacy system maintenance where existing supply channels remain available.

All three Texas Instruments substitutes deliver propagation delay of 6ns, which is superior to the original 6.5ns specification, providing improved timing performance within the same operating envelope.

Frequently Asked Questions (FAQ)

Q: Can the 74ACTQ573QSC be directly replaced with SN74ACT573PWR without circuit modification?

A: Yes. Both parts maintain identical electrical specifications across supply voltage (4.5V ~ 5.5V), output current (24mA), operating temperature range (-40°C ~ 85°C), and logic function (D-Type Transparent Latch 8:8 tri-state). Pin-to-pin compatibility is maintained. Package footprint differences require PCB layout adjustment only.

Q: What is the significance of the package differences between 20-QSOP, 20-SSOP, and 20-TSSOP?

A: All three packages accommodate 20 pins with identical electrical performance. The primary differences are physical dimensions: 20-QSOP (3.90mm width), 20-SSOP (5.30mm width), and 20-TSSOP (4.40mm width). Package selection depends on available PCB real estate and manufacturing capabilities. Electrical function and pin assignment remain unchanged.

Q: Why is the propagation delay specification different between the original part (6.5ns) and the substitutes (6ns)?

A: The Texas Instruments 74ACT573 variants specify 6ns propagation delay, which is within the acceptable tolerance band for this logic family and represents improved performance. This faster switching characteristic does not create compatibility issues in standard applications and may enhance overall circuit timing margins.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three Texas Instruments substitutes (SN74ACT573DBR, SN74ACT573PW, SN74ACT573PWR) carry ROHS3 compliance certification. The original onsemi part does not specify RoHS status. For applications requiring RoHS compliance, the Texas Instruments substitutes are the appropriate selection.

Q: Which substitute part should be selected for new production designs?

A: SN74ACT573PWR is the recommended choice for new production. It maintains active product status, carries ROHS3 compliance, features the compact 20-TSSOP package, and has the highest inventory availability (10,200 units), ensuring supply continuity for volume manufacturing.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message