74F174SC Equivalent & Substitute Parts

Part Overview

The 74F174SC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 6 bits per element in a 16-SOIC surface mount package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is currently classified as obsolete, making identification of equivalent substitute components essential for ongoing system support and new design implementations.

Substiute Parts

74F174SC

onsemiIn Stock: 96874F174SC Datasheet

Current PartRFQ

SN74F174AD

Texas InstrumentsIn Stock: 2090SN74F174AD Datasheet

DirectRFQ

SN74F174ADR

Texas InstrumentsIn Stock: 4312SN74F174ADR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 74F174SC are qualified based on strict electrical and mechanical parameter alignment within the 74F logic series. The following criteria determine substitution validity:

Critical Matching Parameters:

• D-Type flip-flop architecture with 1 element, 6 bits per element
• Master reset function with positive edge triggering
• Non-inverted output configuration
• 16-SOIC surface mount package (0.154", 3.90mm Width)
• Voltage supply range: 4.5V ~ 5.5V
• Operating temperature: 0°C ~ 70°C
• Output current specifications: 1 mA (high), 20 mA (low)
• Quiescent current: 45 mA
• Propagation delay: 10 ns @ 5V, 50pF

The identified substitute parts SN74F174AD and SN74F174ADR, both manufactured by Texas Instruments, meet all critical electrical and mechanical parameters. Differences in clock frequency (140 MHz vs. 80 MHz) and product status represent improvements or alternative availability states within the same functional specification.

Parameter Comparison

Engineering Selection Recommendations

SN74F174ADR (Texas Instruments) - Recommended Primary Substitute

The SN74F174ADR is the preferred substitute for the obsolete 74F174SC. This component carries Active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant and maintains full electrical and mechanical compatibility with the original specification. Packaging in Tape & Reel format supports automated assembly processes. The higher clock frequency specification (140 MHz) provides operational margin beyond the original 80 MHz rating while maintaining identical propagation delay and output characteristics.

SN74F174AD (Texas Instruments) - Secondary Substitute

The SN74F174AD serves as an alternative substitute with Last Time Buy status. This variant meets all electrical and mechanical requirements and is ROHS3 compliant. Packaging in Tube format may be suitable for lower-volume applications or manual assembly scenarios. This part remains available but with limited future procurement windows.

Both Texas Instruments substitutes are qualified for direct replacement in applications currently using the 74F174SC, with no circuit modifications required.

Frequently Asked Questions (FAQ)

Q: Can SN74F174AD and SN74F174ADR be used interchangeably with 74F174SC?

A: Yes. Both Texas Instruments parts meet all critical electrical parameters (voltage supply, propagation delay, output current, quiescent current, operating temperature) and share identical 16-SOIC packaging. The primary difference is packaging format (Tube vs. Tape & Reel) and product lifecycle status.

Q: What is the significance of the higher clock frequency (140 MHz) in the substitute parts?

A: The substitute parts specify 140 MHz maximum clock frequency compared to 80 MHz for the original part. This represents an improved performance specification. Both parts maintain the same 10 ns propagation delay at 5V with 50pF load, confirming functional equivalence for timing-critical applications.

Q: Are there compliance differences between the original and substitute parts?

A: The substitute parts carry ROHS3 compliance certification, while the original part does not specify RoHS status. Both parts maintain REACH Unaffected status and identical Moisture Sensitivity Level (MSL 1 - Unlimited). The substitute parts are suitable for applications requiring RoHS compliance.

Q: Which substitute should be selected for new designs?

A: SN74F174ADR is recommended for new designs due to Active product status, ensuring availability throughout the design lifecycle. The Tape & Reel packaging supports automated manufacturing processes.

Q: Does the 16-SOIC package remain identical across all three parts?

A: Yes. All three parts use 16-SOIC (0.154", 3.90mm Width) surface mount packaging with identical pin configuration and mechanical dimensions. No PCB layout modifications are required for substitution.

Q: Are there inventory considerations for part selection?

A: Current inventory levels show SN74F174ADR with 4,281 pieces available, SN74F174AD with 2,003 pieces, and 74F174SC with 914 pieces. For ongoing production, SN74F174ADR availability is most favorable.