FST3126DR2G Equivalent & Substitute Parts

Part Overview

The FST3126DR2G is a bus switch IC manufactured by onsemi, designed for 1 x 1:1 switching applications in logic circuits. This component features a 14-SOIC surface mount package and operates across a supply voltage range of 4V to 5.5V with an operating temperature range of -55°C to 125°C. The FST3126DR2G is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

FST3126DR2G

onsemiIn Stock: 2246FST3126DR2G Datasheet

Current PartRFQ

FST3125DR2G

onsemiIn Stock: 1993FST3125DR2G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FST3126DR2G is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 1 x 1:1 bus switch topology
• Independent circuits: 4 circuits per package
• Voltage supply range: 4V ~ 5.5V single supply operation
• Operating temperature range: -55°C ~ 125°C
• Package type: 14-SOIC surface mount
• Physical dimensions: 0.154" width, 3.90mm width
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The FST3125DR2G meets all these parameters and qualifies as a parametric equivalent. Both parts share identical electrical specifications, thermal operating ranges, and physical packaging requirements. The primary distinction between these parts is the packaging format: the FST3126DR2G is supplied in Tape & Reel (TR) format, while the FST3125DR2G is supplied in Cut Tape (CT) format.

Parameter Comparison

Engineering Selection Recommendations

The FST3125DR2G is a direct parametric equivalent to the FST3126DR2G for all electrical and thermal applications. Both parts are obsolete products from onsemi and carry identical ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Selection between these two parts should be based on packaging and procurement requirements:

• FST3126DR2G (Tape & Reel format) is suitable for high-volume automated assembly processes requiring continuous reel feeding.
• FST3125DR2G (Cut Tape format) is suitable for lower-volume applications, manual assembly, or situations where individual piece selection is required.

Both parts are electrically and mechanically interchangeable within the same PCB footprint and assembly process, provided the packaging format aligns with the production methodology.

Frequently Asked Questions (FAQ)

Q: Can FST3125DR2G replace FST3126DR2G in my design?

A: Yes. The FST3125DR2G is a parametric equivalent with identical electrical specifications, voltage supply range, operating temperature range, and 14-SOIC package dimensions. The only difference is the packaging format (Cut Tape versus Tape & Reel).

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) format supplies components on a continuous reel suitable for automated pick-and-place assembly. Cut Tape (CT) format supplies components on individual tape segments, typically used for lower-volume or manual assembly applications. Both formats contain the same component in the same package.

Q: Are both parts still available for purchase?

A: Both FST3126DR2G and FST3125DR2G are classified as obsolete products. Availability depends on distributor inventory. FST3126DR2G has 2156 pieces in stock, while FST3125DR2G has 1980 pieces in stock as of the current inventory snapshot.

Q: Do these parts require different PCB footprints?

A: No. Both parts use the 14-SOIC package with identical physical dimensions (0.154" width, 3.90mm width). The PCB footprint is the same for both parts.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical regulatory status. Both have Moisture Sensitivity Level 1 (Unlimited).