L401E3AP TRIAC Equivalent & Substitute Parts

Part Overview

The L401E3AP 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 Through Hole TO-92 package. This component is Active in product status and widely used in AC switching and control applications requiring sensitive gate triggering characteristics.

Substitute parts become necessary when the L401E3AP reaches end-of-life status, inventory constraints occur, or when higher voltage ratings are required for circuit margin improvements while maintaining functional compatibility with the original design parameters.

Key Parameters

Parameter	L401E3AP
Manufacturer	Littelfuse Inc.
Category	Thyristors - TRIAC
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	-65°C to 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The Z0103MA series from STMicroelectronics qualifies as direct substitutes for the L401E3AP based on the following electrical and mechanical compatibility criteria:

Matching Parameters:

Triac Type: Logic - Sensitive Gate (identical functional class)
Current - On State (It RMS Max): 1 A (identical rating)
Voltage - Gate Trigger (Vgt Max): 1.3 V (identical specification)
Current - Gate Trigger (Igt Max): 3 mA (identical specification)
Configuration: Single (identical)
Mounting Type: Through Hole (identical)
Package / Case: TO-226-3, TO-92-3 (TO-226AA) (identical physical form factor)
RoHS Status: ROHS3 Compliant (identical compliance)

Allowable Parameter Differences:

Voltage - Off State: Z0103MA series rated 600 V (higher than L401E3AP 400 V) — this represents an uprated substitute suitable for applications requiring increased voltage margin
Current - Hold (Ih Max): Z0103MA series 7 mA (higher than L401E3AP 5 mA) — within acceptable tolerance for sensitive gate TRIAC applications
Operating Temperature: Z0103MA series -40°C to 125°C (narrower range than L401E3AP -65°C to 125°C) — acceptable for most industrial and consumer applications
Current - Non Rep. Surge: Z0103MA series 8 A / 8.5 A (lower than L401E3AP 16.7 A / 20 A) — acceptable for 1 A rated devices in standard switching duty

The Z0103MA variants differ only in packaging format (Bulk, Cut Tape) and inventory availability, not in electrical specifications.

Parameter Comparison

Parameter	L401E3AP	Z0103MA 1AA2	Z0103MA 2AL2	Z0103MA 5AL2
Manufacturer	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	400 V	600 V	600 V	600 V
Current - On State (It RMS Max)	1 A	1 A	1 A	1 A
Voltage - Gate Trigger (Vgt Max)	1.3 V	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt Max)	3 mA	3 mA	3 mA	3 mA
Current - Hold (Ih Max)	5 mA	7 mA	7 mA	7 mA
Operating Temperature	-65°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Tape & Box (TB)	Bulk	Cut Tape (CT)	Cut Tape (CT)

Engineering Selection Recommendations

All substitute parts (Z0103MA 1AA2, Z0103MA 2AL2, Z0103MA 5AL2) maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original L401E3AP.

The Z0103MA series provides a 600 V off-state voltage rating compared to the L401E3AP 400 V rating. This higher voltage specification is suitable for direct substitution in applications where the original 400 V rating was adequate, as the substitute maintains all critical gate trigger and on-state current parameters.

Selection between Z0103MA variants depends on packaging requirements: Z0103MA 1AA2 is supplied in Bulk format, Z0103MA 2AL2 and Z0103MA 5AL2 are supplied in Cut Tape format. Electrical specifications are identical across all three variants.

Frequently Asked Questions (FAQ)

Q: Can Z0103MA parts directly replace L401E3AP in existing designs?

A: Yes. The Z0103MA series maintains identical gate trigger voltage (1.3 V max), gate trigger current (3 mA max), on-state current (1 A), and TO-92-3 package form factor. The higher 600 V off-state rating provides additional voltage margin without affecting circuit operation in applications originally designed for 400 V.

Q: What is the difference between Z0103MA 1AA2, Z0103MA 2AL2, and Z0103MA 5AL2?

A: These part numbers differ only in packaging format and supplier packaging designation. Z0103MA 1AA2 is supplied in Bulk packaging, while Z0103MA 2AL2 and Z0103MA 5AL2 are supplied in Cut Tape format. Electrical specifications and performance are identical.

Q: Is the narrower operating temperature range of Z0103MA (-40°C to 125°C vs. -65°C to 125°C) a limitation?

A: The Z0103MA operating range is suitable for standard industrial and consumer applications. If the original design requires operation below -40°C, the L401E3AP must be retained. For most applications operating within -40°C to 125°C, the Z0103MA series is fully compatible.

Q: Are all substitute parts RoHS compliant?

A: Yes. Both the L401E3AP and all Z0103MA variants are ROHS3 compliant, ensuring regulatory compliance for EU and equivalent markets.

Q: What is the significance of the higher hold current (Ih) in Z0103MA parts?

A: The Z0103MA series specifies 7 mA maximum hold current compared to 5 mA for the L401E3AP. This difference is within acceptable tolerance for sensitive gate TRIAC applications and does not affect substitution suitability for standard AC switching circuits.

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