74ACTQ533MTCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACTQ533MTCX is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 multiplexer configuration with tri-state output capability in a 20-TSSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates within the 4.5V to 5.5V supply voltage range and is suitable for applications requiring transparent latch functionality with controlled output impedance.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ533MTCX
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	6ns
Current - Output High, Low	24mA, 24mA
Operating Temperature	-40°C ~ 85°C
Package / Case	20-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ533MTCX are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Electrical Parameters:

Logic Type: D-Type Transparent Latch
Circuit Configuration: 8:8
Output Type: Tri-State
Supply Voltage Range: 4.5V ~ 5.5V
Output Current Capability: 24mA (High and Low)
Operating Temperature Range: -40°C ~ 85°C

Mechanical Parameters:

Package Type: 20-TSSOP
Physical Dimensions: 0.173" × 4.40mm Width
Mounting Type: Surface Mount

All substitute parts listed maintain identical electrical specifications and package dimensions, ensuring direct functional replacement without circuit redesign or PCB layout modification.

Parameter Comparison

Parameter	74ACTQ533MTCX (onsemi)	SN74ACT533PW (TI)	SN74ACT533PWR (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	6ns	2.5ns	2.5ns	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
Package / Case	20-TSSOP	20-TSSOP	20-TSSOP	20-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SN74ACT533PWR (Texas Instruments) - Primary Recommendation

This part is the preferred substitute for new designs and production continuity. It maintains active product status with ROHS3 compliance certification. The propagation delay of 2.5ns provides improved performance compared to the original 6ns specification while maintaining full electrical and mechanical compatibility. Available in Tape & Reel packaging with 683 pieces in current inventory.

SN74ACT533PW (Texas Instruments) - Secondary Option

This variant offers identical electrical performance to SN74ACT533PWR with 2.5ns propagation delay and ROHS3 compliance. Product status is Last Time Buy, indicating limited future availability. Supplied in Tube packaging with 1506 pieces in inventory. Suitable for applications where packaging format is not a constraint.

SN74ACT573PWR (Texas Instruments) - Parametric Equivalent

This part matches the original 6ns propagation delay specification and maintains all other electrical parameters. ROHS3 compliant with Active product status. Available in Cut Tape and Digi-Reel packaging with 10200 pieces in inventory. Recommended when propagation delay matching is a design requirement.

All three substitutes carry REACH Unaffected and EAR99 export classification status, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT533PWR directly replace 74ACTQ533MTCX without PCB modification?

A: Yes. Both parts use identical 20-TSSOP packaging with matching pin configurations, electrical specifications, and operating parameters. No circuit redesign or PCB layout changes are required.

Q: What is the difference between SN74ACT533PWR and SN74ACT573PWR?

A: Both parts are functionally equivalent D-Type Transparent Latch ICs with 8:8 configuration and tri-state output. The primary difference is the base product number (74ACT533 versus 74ACT573), which reflects different internal logic implementations. Both maintain identical supply voltage, output current, operating temperature, and package specifications. SN74ACT573PWR matches the original 6ns propagation delay, while SN74ACT533PWR offers faster 2.5ns performance.

Q: Why is the 74ACTQ533MTCX marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by onsemi. Texas Instruments equivalents (SN74ACT533 and SN74ACT573 series) provide continued availability and support for this logic function.

Q: Are all substitute parts RoHS compliant?

A: Yes. All Texas Instruments substitutes carry ROHS3 Compliant certification. The original onsemi part does not specify RoHS status.

Q: What packaging options are available for substitutes?

A: SN74ACT533PWR is supplied in Tape & Reel format. SN74ACT533PW is available in Tube packaging. SN74ACT573PWR is supplied in Cut Tape and Digi-Reel format. All maintain the same 20-TSSOP physical package.

Q: Which substitute should I select for new production?

A: SN74ACT533PWR is recommended for new designs due to its Active product status, improved 2.5ns propagation delay, and standard Tape & Reel packaging format suitable for automated assembly.

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