L4N5 TRIAC Equivalent & Substitute Parts

Part Overview

The L4N5 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 DO-214AA package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Triac Type	Logic - Sensitive Gate
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	1 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	10 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	DO-214AA, SMB (3 Leads), Compak
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the L4N5 is determined by the following critical parameters:

Triac Type: Logic - Sensitive Gate configuration
Voltage - Off State: Minimum 400 V rating
Current - On State: 1 A or greater
Gate Trigger characteristics: Vgt and Igt within acceptable ranges
Package compatibility: Surface mount with compatible pinout
Environmental compliance: RoHS status and operating temperature range

The L4N5RP is a direct equivalent from the same manufacturer with identical electrical specifications and package, differing only in packaging format (Tape & Reel) and product status (Active). The BT131W-600,135 is a manufacturer-recommended substitute with higher voltage rating (600 V) and modified gate trigger parameters, suitable for applications requiring enhanced voltage margin.

Parameter Comparison

Parameter	L4N5	L4N5RP	BT131W-600,135
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	WeEn Semiconductors
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	400 V	400 V	600 V
Current - On State (It (RMS)) (Max)	1 A	1 A	1 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	3 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	5 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	125°C (TJ)
Package / Case	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	TO-261-4, TO-261AA
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

For applications currently using the L4N5, the L4N5RP is the primary substitute. It maintains identical electrical specifications and package form factor while offering active product status and improved availability. The L4N5RP is sourced from the same manufacturer and carries equivalent compliance certifications.

The BT131W-600,135 is suitable as a substitute when higher off-state voltage margin is required. This part introduces a different package form (TO-261-4 versus DO-214AA) and modified gate trigger parameters. The lower gate trigger current (3 mA versus 5 mA) and reduced hold current (5 mA versus 10 mA) may affect circuit behavior in sensitive gate applications. PCB layout modifications are necessary due to package incompatibility.

Both substitute parts maintain RoHS compliance and support the operating temperature range of the original design.

Frequently Asked Questions (FAQ)

Q: Can L4N5RP be used as a direct replacement for L4N5?

A: Yes. The L4N5RP is electrically and mechanically identical to the L4N5, with the same DO-214AA package, voltage rating (400 V), current rating (1 A), and gate trigger specifications. The only difference is packaging format (Tape & Reel) and active product status.

Q: What are the key differences between L4N5 and BT131W-600,135?

A: The BT131W-600,135 has a higher off-state voltage rating (600 V versus 400 V), different package form (TO-261-4 versus DO-214AA), and modified gate trigger parameters. The gate trigger voltage is higher (1.5 V versus 1.3 V), and gate trigger current is lower (3 mA versus 5 mA). These differences require circuit evaluation and PCB redesign.

Q: Is package compatibility required for substitution?

A: Package compatibility depends on application requirements. The L4N5RP maintains the same DO-214AA package as the original L4N5. The BT131W-600,135 uses a different package (TO-261-4), requiring PCB layout modifications and potential circuit adjustments.

Q: Are all substitute parts RoHS compliant?

A: Yes. The L4N5RP carries ROHS3 compliance, and the BT131W-600,135 carries RoHS compliance. Both meet environmental regulatory requirements.

Q: What is the inventory status of substitute parts?

A: L4N5RP has 621 pieces in stock. BT131W-600,135 has 678 pieces in stock. Both are available as active products.

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