L2N3 Equivalent & Substitute Parts

Part Overview

The L2N3 is a logic-sensitive gate TRIAC manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 1 A on-state current in a surface mount DO-214AA package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The part operates across an industrial temperature range of -40°C to 125°C and is RoHS3 compliant.

Substiute Parts

L2N3

Littelfuse Inc.In Stock: 738L2N3 Datasheet

Current PartRFQ

BT131W-600,135

WeEn SemiconductorsIn Stock: 748BT131W-600,135 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L2N3 TRIAC is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• TRIAC type must be logic-sensitive gate configuration
• Gate trigger voltage (Vgt) and gate trigger current (Igt) must be compatible with existing circuit design
• Gate hold current (Ih) must not exceed circuit requirements
• On-state current rating (It RMS) must meet or exceed application demands
• Off-state voltage rating must equal or exceed the L2N3 specification of 200 V

Mechanical Compatibility Criteria:

• Surface mount package type must be compatible with PCB layout and assembly equipment
• Lead configuration must support existing footprint or allow minor layout adjustment
• Moisture sensitivity level must be acceptable for storage and handling conditions

The BT131W-600,135 qualifies as a substitute based on matching TRIAC type (logic-sensitive gate), identical on-state current rating (1 A), compatible gate trigger parameters (Vgt 1.5 V, Igt 3 mA), and matching hold current (5 mA). The higher off-state voltage rating (600 V) provides design margin for applications originally specified at 200 V. Both components are surface mount devices with MSL 1 rating and RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The BT131W-600,135 is an active product from WeEn Semiconductors with current manufacturing support and established supply chain availability. The L2N3 is obsolete, eliminating long-term sourcing viability. Both components meet RoHS compliance requirements and share identical MSL ratings, ensuring equivalent handling and storage protocols.

The BT131W-600,135 provides higher off-state voltage capability (600 V versus 200 V), which is advantageous for applications requiring design margin or operating in higher voltage environments. Gate trigger parameters are closely matched, with the BT131W-600,135 showing a marginal increase in Vgt (1.5 V versus 1.3 V), which remains within typical circuit tolerance ranges for logic-sensitive gate TRIAC applications.

Package differences exist between the two components (DO-214AA versus SC-73). PCB layout and assembly process compatibility must be evaluated during design transition. Both are surface mount devices suitable for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can the BT131W-600,135 directly replace the L2N3 without circuit modification?

A: Electrical compatibility is established through matching TRIAC type, on-state current rating, and gate trigger parameters. Package differences (DO-214AA versus SC-73) require PCB footprint verification. No circuit parameter changes are necessary if the higher off-state voltage rating (600 V) is acceptable for the application.

Q: What is the significance of the higher 600 V off-state voltage rating on the BT131W-600,135?

A: The BT131W-600,135 is rated for 600 V off-state voltage compared to the L2N3 specification of 200 V. This higher rating provides design margin and allows the component to operate safely in applications with higher transient voltages or in systems originally designed for higher voltage classes.

Q: Are there any temperature range differences between these components?

A: The L2N3 specifies -40°C to 125°C operating range. The BT131W-600,135 datasheet indicates operation up to 125°C. Verification of the lower temperature limit for the BT131W-600,135 is recommended if operation below 0°C is required.

Q: How do the gate trigger parameters compare?

A: Both components specify identical gate trigger current (Igt) of 3 mA maximum and matching hold current (Ih) of 5 mA maximum. Gate trigger voltage differs slightly: L2N3 at 1.3 V maximum versus BT131W-600,135 at 1.5 V maximum. This 0.2 V difference is within typical circuit design tolerances for logic-sensitive gate TRIAC applications.

Q: What packaging considerations apply to this substitution?

A: The L2N3 uses DO-214AA (SMB) 3-lead package, while the BT131W-600,135 uses SC-73 package. Both are surface mount configurations. PCB footprint, solder pad layout, and assembly equipment compatibility must be verified before production transition.

Q: Are both components RoHS compliant?

A: Yes. The L2N3 is RoHS3 compliant, and the BT131W-600,135 is RoHS compliant. Both components meet environmental compliance requirements for restricted substance use.