74ACTQ533PC Equivalent & Substitute Parts

Part Overview

The 74ACTQ533PC is a D-Type Transparent Latch logic IC manufactured by onsemi, featuring an 8:8 multiplexer configuration with tri-state output capability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates within the 4.5V to 5.5V supply voltage range and is housed in a 20-pin DIP package suitable for through-hole mounting applications.

Key Parameters

Parameter	Value
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-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the 74ACTQ533PC are qualified based on strict parameter alignment across the following criteria:

Logic Type & Circuit Configuration: All substitutes maintain D-Type Transparent Latch architecture with 8:8 multiplexer configuration
Electrical Specifications: Supply voltage range (4.5V ~ 5.5V), output current ratings (24mA high/low), and operating temperature range (-40°C ~ 85°C) must match exactly
Output Characteristics: Tri-state output capability is mandatory
Package Compatibility: 20-DIP (0.300", 7.62mm) through-hole mounting is required for direct replacement
Propagation Delay: Substitutes with equal or faster propagation delay (≤6ns) are acceptable

Two substitute parts meet these criteria: SN74ACT533N (faster propagation at 2.5ns) and SN74ACT573N / SN74ACT573NE4 (matched propagation at 6ns).

Parameter Comparison

Parameter	74ACTQ533PC (onsemi)	SN74ACT533N (TI)	SN74ACT573N (TI)	SN74ACT573NE4 (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	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
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	Active	Active	Discontinued at DiGi Electronics
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SN74ACT533N (Texas Instruments)

The SN74ACT533N is the preferred substitute for the obsolete 74ACTQ533PC. This part maintains full electrical and mechanical compatibility while offering superior performance characteristics. The SN74ACT533N features a propagation delay of 2.5ns, which is faster than the original 6ns specification, providing improved timing margins in digital logic applications. The part carries Active product status with ROHS3 compliance certification, ensuring long-term availability and environmental regulatory alignment.

Secondary Recommendation: SN74ACT573N (Texas Instruments)

The SN74ACT573N provides an alternative with matched propagation delay (6ns) to the original 74ACTQ533PC. This part is also Active status with ROHS3 compliance. Selection of this part is appropriate when timing-critical applications require exact propagation delay matching to the original specification.

Not Recommended: SN74ACT573NE4 (Texas Instruments)

The SN74ACT573NE4 is discontinued at DiGi Electronics and carries limited inventory availability (801 pcs). While electrically equivalent, the discontinued status and reduced supply chain support make this option unsuitable for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT533N replace the 74ACTQ533PC in existing designs?

A: Yes. The SN74ACT533N is a direct functional replacement. Both parts share identical logic type, circuit configuration, output type, supply voltage range, output current ratings, operating temperature range, and package specifications. The faster propagation delay (2.5ns vs. 6ns) is a performance improvement that does not compromise compatibility.

Q: What is the difference between SN74ACT533N and SN74ACT573N?

A: Both parts are D-Type Transparent Latch ICs with 8:8 configuration and tri-state output. The primary difference is propagation delay: SN74ACT533N operates at 2.5ns while SN74ACT573N operates at 6ns. Selection depends on timing requirements. For applications requiring exact timing match to the original 74ACTQ533PC, the SN74ACT573N is appropriate.

Q: Are these parts pin-compatible with the 74ACTQ533PC?

A: Yes. All substitute parts use the 20-DIP (0.300", 7.62mm) through-hole package, ensuring direct pin-for-pin compatibility and identical PCB footprint.

Q: What is the supply voltage requirement for these parts?

A: All parts, including the original 74ACTQ533PC and all substitutes, operate within the 4.5V to 5.5V supply voltage range. This specification is identical across all listed components.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both SN74ACT533N and SN74ACT573N carry ROHS3 compliance certification. The original 74ACTQ533PC does not specify RoHS status. The substitute parts meet current environmental regulatory requirements for electronic components.

Q: What is the maximum output current for these parts?

A: All parts, including the 74ACTQ533PC and its substitutes, provide 24mA output current capability for both high and low states, ensuring adequate drive capability for standard logic loads.

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