L0109DTRP4 Equivalent & Substitute Parts

Part Overview

The L0109DTRP4 is a logic-sensitive gate TRIAC manufactured by Littelfuse Inc., rated for 400 V off-state voltage and 1 A on-state current in a surface mount SOT-223 package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The substitute part maintains identical electrical specifications and mechanical compatibility, enabling direct replacement in existing applications.

Substiute Parts

L0109DTRP4

Littelfuse Inc.In Stock: 15527L0109DTRP4 Datasheet

Current PartRFQ

L0109DTRP

Littelfuse Inc.In Stock: 4157L0109DTRP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L0109DTRP4 is based on strict equivalence across all critical electrical and mechanical parameters. The substitute part L0109DTRP maintains identical specifications in the following key areas:

• Triac type classification (Logic - Sensitive Gate)
• Voltage rating (400 V off-state)
• Current ratings (1 A on-state, 10 mA gate trigger, 10 mA hold current)
• Gate trigger voltage threshold (1.3 V maximum)
• Surge current capability (10A, 12A for 50, 60Hz)
• Operating temperature range (-40°C ~ 125°C)
• Package and pinout (TO-261-4, TO-261AA / SOT-223)
• Environmental compliance (ROHS3, MSL 1)

The primary distinction is product status: L0109DTRP4 is obsolete, while L0109DTRP is active. Both are manufactured by Littelfuse Inc. and share identical electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The L0109DTRP is the direct active equivalent for the obsolete L0109DTRP4. Both components are manufactured by Littelfuse Inc. and carry identical electrical specifications, thermal ratings, and environmental compliance certifications (ROHS3 Compliant, MSL 1). The substitute part is available in active production status with Tape & Reel packaging, ensuring supply chain continuity and procurement reliability.

For applications currently using L0109DTRP4, direct substitution with L0109DTRP is electrically and mechanically compatible without circuit modification. Both parts share the same TO-261-4 and TO-261AA package footprints and SOT-223 supplier device package designation, enabling pin-for-pin replacement on existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can L0109DTRP replace L0109DTRP4 in existing designs?

A: Yes. Both parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications across all critical parameters: 400 V off-state voltage, 1 A on-state current, 1.3 V gate trigger voltage, and -40°C ~ 125°C operating temperature range. The package footprint (TO-261-4, TO-261AA) and pinout are identical, enabling direct PCB substitution.

Q: What is the primary reason for substitution?

A: L0109DTRP4 is classified as obsolete, while L0109DTRP is an active product. Substitution ensures access to current manufacturing stock and ongoing supplier support.

Q: Are there packaging differences between these parts?

A: L0109DTRP4 packaging is not specified in the product data. L0109DTRP is supplied in Tape & Reel (TR) format. Both use the SOT-223 supplier device package. Verify packaging requirements for your procurement process.

Q: Do both parts meet the same environmental compliance standards?

A: Yes. Both L0109DTRP4 and L0109DTRP are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), meeting identical environmental and regulatory requirements.

Q: Are the electrical characteristics identical?

A: Yes. All electrical parameters are identical: gate trigger voltage (1.3 V max), gate trigger current (10 mA max), hold current (10 mA max), and surge current capability (10A, 12A for 50, 60Hz).