74ACTQ574SJX Equivalent & Substitute Parts

Part Overview

The 74ACTQ574SJX is a single-element D-type flip-flop logic integrated circuit manufactured by onsemi, designed for 8-bit positive edge-triggered applications. This component operates at a clock frequency of 85 MHz with tri-state, non-inverted outputs and is housed in a 20-SOIC package measuring 0.209" × 5.30mm width. The part is currently obsolete, making equivalent substitute parts necessary for ongoing system support and new designs requiring compatible functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ574SJX
Manufacturer	onsemi
Category	Logic
Type	D-Type Flip Flop
Number of Elements	1
Number of Bits per Element	8
Output Type	Tri-State, Non-Inverted
Clock Frequency	85 MHz
Trigger Type	Positive Edge
Voltage Supply Range	4.5V ~ 5.5V
Current Output (High/Low)	24mA / 24mA
Max Propagation Delay	9ns @ 5V, 50pF
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ574SJX is determined by the following critical parameters:

Core Functional Requirements:

Type: D-Type flip-flop with single element, 8-bit configuration
Output Type: Tri-state, non-inverted
Trigger Type: Positive edge
Voltage Supply: 4.5V ~ 5.5V compatibility
Output Current: 24mA minimum (both high and low)

Electrical Performance Criteria:

Clock Frequency: Minimum 85 MHz (equal or greater)
Propagation Delay: Maximum 9ns @ 5V, 50pF (equal or less)
Current - Quiescent (Iq): Must not exceed specified limits for power-sensitive applications
Input Capacitance: Acceptable range for signal integrity

Physical & Environmental Criteria:

Package: 20-SOIC form factor (mechanical compatibility required)
Mounting Type: Surface mount
Operating Temperature: Must support -40°C ~ 85°C minimum range
Moisture Sensitivity Level: MSL 1 (unlimited)

Substitute parts meeting all core functional requirements and electrical performance criteria are considered direct equivalents. Parts with enhanced specifications (higher clock frequency, lower propagation delay, extended temperature range) are backward-compatible alternatives.

Parameter Comparison

Parameter	74ACTQ574SJX (onsemi)	CD74ACT574M (TI)	CD74ACT574M96 (TI)	SN74ACT574DW (TI)	SN74ACT574DWR (TI)	SN74ACT574NSR (TI)
Type	D-Type	D-Type	D-Type	D-Type	D-Type	D-Type
Number of Elements	1	1	1	1	1	1
Number of Bits per Element	8	8	8	8	8	8
Output Type	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted	Tri-State, Non-Inverted
Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Clock Frequency	85 MHz	110 MHz	110 MHz	110 MHz	110 MHz	110 MHz
Max Propagation Delay @ 5V, 50pF	9ns	11.2ns	11.2ns	11ns	11ns	11ns
Current - Output High, Low	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Iq)	40 µA	8 µA	8 µA	4 µA	4 µA	4 µA
Input Capacitance	4.5 pF	10 pF	10 pF	4.5 pF	4.5 pF	4.5 pF
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	20-SOIC (0.209", 5.30mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.295", 7.50mm)	20-SOIC (0.209", 5.30mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Obsolete	Active	Discontinued at DiGi Electronics	Active	Active
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SN74ACT574NSR (Texas Instruments)

The SN74ACT574NSR is the optimal substitute for the 74ACTQ574SJX. This part maintains identical package dimensions (20-SOIC, 0.209" × 5.30mm width), matching input capacitance (4.5 pF), and operating temperature range (-40°C ~ 85°C). The SN74ACT574NSR is currently active in production with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment. Propagation delay (11ns) and clock frequency (110 MHz) exceed the original specification, providing performance headroom.

Secondary Recommendation: SN74ACT574DWR (Texas Instruments)

The SN74ACT574DWR serves as an alternative with identical electrical specifications to the SN74ACT574NSR. This part is active in production and available in Cut Tape and Digi-Reel packaging. The package width differs (0.295" vs. 0.209"), requiring PCB layout verification for mechanical fit.

Extended Temperature Alternative: CD74ACT574M96 (Texas Instruments)

The CD74ACT574M96 is suitable for applications requiring extended operating temperature range (-55°C ~ 125°C). This part is active in production with ROHS3 compliance and offers the highest inventory availability (50,300 pcs). Package width (0.295", 7.50mm) differs from the original, necessitating mechanical compatibility assessment.

Compatibility Note:

All recommended substitutes maintain functional equivalence through identical D-type flip-flop architecture, 8-bit configuration, tri-state non-inverted outputs, and positive edge triggering. Electrical parameters (supply voltage, output current, trigger characteristics) are fully compatible. Package width variations require PCB footprint verification during design transition.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74ACTQ574SJX with any of the recommended substitutes?

A: Electrical and functional compatibility is confirmed for all recommended parts. However, package width differences must be verified. The SN74ACT574NSR maintains identical package dimensions (0.209" width) and is the direct mechanical replacement. The SN74ACT574DWR and CD74ACT574M96 feature wider packages (0.295" width) and require PCB layout assessment.

Q: What is the significance of the propagation delay difference (9ns vs. 11ns)?

A: The substitute parts exhibit slightly higher propagation delay (11ns maximum vs. 9ns for the original). This represents a 2ns increase and remains within acceptable margins for most 5V logic applications. Systems with timing-critical paths operating near maximum frequency limits should verify timing margins through simulation or testing.

Q: Why do some substitutes have lower quiescent current (4 µA vs. 40 µA)?

A: The Texas Instruments 74ACT series variants incorporate improved power management design, resulting in significantly lower standby current consumption. This represents a design enhancement and provides power efficiency benefits without compromising functional compatibility.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. The SN74ACT574NSR, SN74ACT574DWR, and CD74ACT574M96 are all ROHS3 compliant. The original 74ACTQ574SJX RoHS status is not specified in available documentation.

Q: Which substitute offers the best long-term availability?

A: The CD74ACT574M96 is the recommended choice for long-term availability, with 50,300 pcs in current inventory and active production status. The SN74ACT574NSR and SN74ACT574DWR are also active in production with substantial inventory levels (4,200 pcs and 18,709 pcs respectively).

Q: Can I use the CD74ACT574M96 in applications requiring the original -40°C ~ 85°C temperature range?

A: Yes. The CD74ACT574M96 supports an extended temperature range of -55°C ~ 125°C, which fully encompasses the original -40°C ~ 85°C specification. This part is suitable for all temperature environments supported by the original component.

Q: What packaging options are available for the recommended substitutes?

A: The SN74ACT574NSR is supplied in Tape & Reel (TR) packaging. The SN74ACT574DWR is available in Cut Tape (CT) and Digi-Reel packaging. The CD74ACT574M96 is supplied in Tape & Reel packaging. Packaging selection depends on production volume and assembly process requirements.

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