L4N3 TRIAC Equivalent & Substitute Parts

Part Overview

The L4N3 is a Logic - Sensitive Gate TRIAC 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)	3 mA
Current - Hold (Ih) (Max)	5 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB (3 Leads), Compak
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the L4N3 is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

Triac Type: Logic - Sensitive Gate
Voltage - Off State: 400 V minimum
Current - On State: 1 A or greater
Gate Trigger characteristics: Vgt ≤ 1.3 V, Igt ≤ 3 mA
Hold Current: Ih ≤ 5 mA
Mounting Type: Surface Mount
Operating Temperature Range: -40°C to 125°C minimum

Substitute Parts Identified:

L4N3RP (Littelfuse Inc.) - Direct equivalent with identical electrical specifications and active product status. Packaging differs (Tape & Reel vs. bulk).
BT131W-600,135 (WeEn Semiconductors) - Manufacturer-recommended substitute with higher voltage rating (600 V) and compatible gate trigger characteristics. Package configuration differs (SC-73 vs. DO-214AA).

Parameter Comparison

Parameter	L4N3	L4N3RP	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)	3 mA	3 mA	3 mA
Current - Hold (Ih) (Max)	5 mA	5 mA	5 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	125°C (TJ)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB (3 Leads), Compak	DO-214AA, SMB (3 Leads), Compak	TO-261-4, TO-261AA, SC-73
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

L4N3RP is the direct functional equivalent with identical electrical specifications and active product status. This part maintains the same voltage rating, current handling, and gate trigger characteristics as the L4N3. The primary difference is packaging format (Tape & Reel). This substitute is suitable for direct replacement in applications requiring the original 400 V rating.

BT131W-600,135 is a manufacturer-recommended alternative with a higher voltage rating (600 V) and compatible gate trigger performance. The elevated voltage rating provides additional design margin in applications where the 400 V specification is not a limiting constraint. The SC-73 package differs from the original DO-214AA, requiring PCB layout verification. Both substitute parts maintain ROHS compliance and unlimited moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can L4N3RP be used as a direct replacement for L4N3?

A: Yes. L4N3RP is electrically identical to L4N3 with the same voltage, current, and gate trigger specifications. The difference is packaging format (Tape & Reel vs. bulk). Both are surface mount components with compatible pinouts.

Q: What is the primary difference between L4N3 and BT131W-600,135?

A: The BT131W-600,135 has a higher off-state voltage rating (600 V vs. 400 V) and a slightly higher gate trigger voltage (1.5 V vs. 1.3 V). The package configuration also differs (SC-73 vs. DO-214AA). Both maintain 1 A on-state current and compatible gate trigger current specifications.

Q: Can BT131W-600,135 be used in a 400 V application?

A: Yes. The BT131W-600,135 is rated for 600 V off-state voltage, which exceeds the 400 V requirement. It is suitable for applications designed for 400 V operation. PCB layout changes may be required due to package differences.

Q: Are all substitute parts RoHS compliant?

A: Yes. L4N3RP and BT131W-600,135 are both RoHS compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What packaging considerations apply when switching to BT131W-600,135?

A: The BT131W-600,135 uses SC-73 package (TO-261-4, TO-261AA) instead of the original DO-214AA. PCB footprint, lead spacing, and thermal management layout require verification before implementation.

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