SN74ACT74DG4 Equivalent & Substitute Parts

Part Overview

The SN74ACT74DG4 is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-SOIC surface mount package. This component functions as a Set/Preset and Reset element with complementary outputs, operating at a maximum clock frequency of 210 MHz. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

SN74ACT74DG4

Texas InstrumentsIn Stock: 1033SN74ACT74DG4 Datasheet

Current PartRFQ

SN74ACT74DR

Texas InstrumentsIn Stock: 2228SN74ACT74DR Datasheet

DirectRFQ

MC74ACT74DR2G

onsemiIn Stock: 6226MC74ACT74DR2G Datasheet

DirectRFQ

SN74ACT74D

Texas InstrumentsIn Stock: 3013SN74ACT74D Datasheet

MFR RecommendedRFQ

MC74ACT74DG

onsemiIn Stock: 2049MC74ACT74DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74ACT74DG4 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Series: 74ACT
• Type: D-Type Flip Flop
• Number of Elements: 2
• Number of Bits per Element: 1
• Output Type: Complementary
• Clock Frequency: 210 MHz
• Trigger Type: Positive Edge
• Current - Output High/Low: 24 mA / 24 mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Allowable Parameter Variations:

• Max Propagation Delay: 7.5 ns to 11 ns (faster or equal performance acceptable)
• Current - Quiescent (Iq): 2 µA to 4 µA (within operational tolerance)
• Input Capacitance: 3 pF to 4.5 pF (within operational tolerance)
• Manufacturer: Texas Instruments or onsemi (both 74ACT series producers)
• Packaging Format: Cut Tape, Digi-Reel, Tape & Reel, or Tube (all surface mount compatible)
• Product Status: Active or Discontinued (functional equivalence maintained)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

SN74ACT74DR and SN74ACT74D are Texas Instruments direct equivalents with improved propagation delay specifications (7.5 ns versus 11 ns). Both maintain identical electrical characteristics and 14-SOIC packaging. SN74ACT74DR is currently active and available in Cut Tape and Digi-Reel packaging formats.

MC74ACT74DR2G and MC74ACT74DG are onsemi equivalents with identical functional specifications. These parts exhibit slightly elevated quiescent current (4 µA versus 2 µA) and input capacitance (4.5 pF versus 3 pF), remaining within acceptable operational tolerances. Both are currently active and ROHS3 compliant.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and identical supply voltage and operating temperature ranges. Selection between Texas Instruments and onsemi sources depends on supply chain availability and procurement requirements. The faster propagation delay variants (7.5 ns) provide performance margin over the original specification (11 ns) without functional impact.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT74DR be used as a direct replacement for SN74ACT74DG4?

A: Yes. SN74ACT74DR is a direct functional equivalent with identical electrical specifications and 14-SOIC packaging. The improved propagation delay (7.5 ns versus 11 ns) provides performance margin without compatibility issues.

Q: What is the difference between Texas Instruments and onsemi 74ACT74 variants?

A: Both manufacturers produce 74ACT series logic with identical functional specifications. onsemi variants (MC74ACT74DR2G and MC74ACT74DG) exhibit slightly higher quiescent current (4 µA versus 2 µA) and input capacitance (4.5 pF versus 3 pF), remaining within operational tolerance. Selection is based on supply availability and procurement preference.

Q: Are packaging format differences (Cut Tape, Digi-Reel, Tape & Reel, Tube) electrically significant?

A: No. Packaging format affects only handling, storage, and assembly processes. All variants maintain identical electrical performance and 14-SOIC physical dimensions. Selection depends on manufacturing assembly requirements and inventory management.

Q: Can faster propagation delay variants (7.5 ns) replace the original 11 ns specification?

A: Yes. Faster propagation delay represents improved performance and maintains full backward compatibility. No circuit redesign is required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original SN74ACT74DG4 specifications.

Q: What is the impact of higher quiescent current in onsemi variants?

A: onsemi parts exhibit 4 µA quiescent current versus 2 µA in Texas Instruments variants. This difference remains within acceptable operational tolerance for 74ACT series logic and does not affect functional compatibility or circuit performance in standard applications.