74ACT574SJX Equivalent & Substitute Parts

Part Overview

The 74ACT574SJX is a single-element D-type flip-flop logic integrated circuit with 8-bit capacity, manufactured by onsemi in a 20-SOIC 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 as a positive edge-triggered flip-flop with tri-state, non-inverted outputs, suitable for digital logic applications requiring synchronous data storage and transfer.

Substiute Parts

74ACT574SJX

onsemiIn Stock: 328474ACT574SJX Datasheet

Current PartRFQ

CD74ACT574M

Texas InstrumentsIn Stock: 3513CD74ACT574M Datasheet

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CD74ACT574M96

Texas InstrumentsIn Stock: 50372CD74ACT574M96 Datasheet

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SN74ACT574DW

Texas InstrumentsIn Stock: 2264SN74ACT574DW Datasheet

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SN74ACT574DWR

Texas InstrumentsIn Stock: 18738SN74ACT574DWR Datasheet

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SN74ACT574NSR

Texas InstrumentsIn Stock: 4218SN74ACT574NSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT574SJX are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts must maintain the following core parameters:

• Base product number: 74ACT574
• Type: D-Type flip-flop, single element, 8-bit
• Output type: Tri-state, non-inverted
• Clock frequency: 110 MHz
• Trigger type: Positive edge
• Supply voltage: 4.5V ~ 5.5V
• Output current: 24 mA (high and low)
• Mounting type: Surface mount
• Moisture sensitivity level: 1 (Unlimited)

Substitutes are classified into two categories:

Direct Substitutes (Pin-Compatible, Identical Package): Parts maintaining the exact 20-SOIC (0.209", 5.30mm Width) package footprint as the main part.

Functional Equivalents (Same Electrical Function, Alternative Package): Parts with identical electrical specifications but utilizing the 20-SOIC (0.295", 7.50mm Width) package variant, requiring PCB layout verification for mechanical fit.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT574NSR (Texas Instruments)

The SN74ACT574NSR is the optimal substitute for the 74ACT574SJX. This part maintains identical package geometry (20-SOIC, 0.209" width), matching electrical specifications, and active product status. The SN74ACT574NSR is ROHS3 compliant and available in Tape & Reel packaging with 4,200 units in stock. Quiescent current is reduced to 4 µA compared to the original 40 µA, providing improved power efficiency without functional compromise.

Secondary Recommendation: SN74ACT574DWR (Texas Instruments)

The SN74ACT574DWR provides functional equivalence with identical electrical performance and active product status. This part uses an alternative 20-SOIC package (0.295" width), requiring PCB layout verification for mechanical compatibility. The SN74ACT574DWR is ROHS3 compliant with 18,709 units in stock and available in Cut Tape and Digi-Reel packaging.

Extended Temperature Range Option: CD74ACT574M96 (Texas Instruments)

The CD74ACT574M96 extends operating temperature range to -55°C ~ 125°C, suitable for applications requiring wider thermal performance. This part is active, ROHS3 compliant, and available in high volume (50,300 units). The 20-SOIC (0.295" width) package requires PCB layout verification. Propagation delay increases marginally to 11.2 ns and input capacitance to 10 pF.

Avoid: CD74ACT574M (Texas Instruments)

While functionally equivalent, the CD74ACT574M is classified as obsolete, limiting long-term supply reliability. The SN74ACT574DWR or CD74ACT574M96 are preferred alternatives.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT574DWR be used as a direct replacement without PCB modification?

A: No. While electrically identical, the SN74ACT574DWR uses a 20-SOIC package with 0.295" width compared to the 74ACT574SJX at 0.209" width. PCB footprint verification is required. The SN74ACT574NSR maintains the original package width and requires no layout changes.

Q: What is the significance of the quiescent current difference between the 74ACT574SJX (40 µA) and substitute parts (4-8 µA)?

A: The lower quiescent current in substitute parts represents improved power efficiency during standby operation. This reduction does not affect functional performance and is beneficial for battery-powered or power-constrained applications.

Q: Are all substitute parts ROHS3 compliant?

A: All Texas Instruments substitutes listed (SN74ACT574NSR, SN74ACT574DWR, SN74ACT574DW, CD74ACT574M96) are ROHS3 compliant. The original 74ACT574SJX does not specify RoHS status.

Q: Which substitute offers the widest operating temperature range?

A: The CD74ACT574M96 and CD74ACT574M extend operating temperature to -55°C ~ 125°C, compared to -40°C ~ 85°C for the original part and most substitutes. This is relevant for industrial or automotive applications requiring extended thermal performance.

Q: What is the difference between packaging types (Tube, Tape & Reel, Cut Tape)?

A: Tube packaging is manual handling; Tape & Reel is automated assembly compatible; Cut Tape & Digi-Reel is semi-automated. Selection depends on production volume and assembly equipment capability.

Q: Is the 11.2 ns propagation delay of CD74ACT574M96 acceptable as a substitute for the 11 ns specification?

A: Yes. The 0.2 ns difference is within typical design margins for 74ACT logic circuits and does not constitute a functional limitation for standard applications.