L401E8 TRIAC Equivalent & Substitute Parts

Part Overview

The L401E8 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 with full RoHS3 compliance. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the thyristor category.

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)	10 mA
Current - Hold (Ih) (Max)	15 mA
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Operating Temperature	-65°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the L401E8 are classified based on the following substitution criteria:

Parametric Equivalent: Parts matching all critical electrical parameters (Triac Type, Voltage - Off State, Current - On State, Voltage - Gate Trigger, Current - Gate Trigger, Current - Hold) and mechanical compatibility (Through Hole mounting, TO-92 package).

Manufacturer Recommended: Parts with compatible electrical characteristics but differing in one or more parameters, approved by the original manufacturer for specific application contexts.

The substitution logic is determined by:

Triac Type: Logic - Sensitive Gate
Voltage - Off State: 400 V (parametric equivalent) or higher ratings (manufacturer recommended)
Current - On State: 1 A
Gate trigger parameters: Vgt (Max) 1.3 V, Igt (Max) 10 mA
Mounting and package compatibility: Through Hole, TO-92

Parameter Comparison

Parameter	L401E8 (Littelfuse)	Q401E3 (Littelfuse)	Z0109MA 5AL2 (STMicroelectronics)
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	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA	10 mA
Current - Hold (Ih) (Max)	15 mA	15 mA	10 mA
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
Operating Temperature	-65°C ~ 125°C	-65°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

Q401E3 (Littelfuse Inc.): This part is a parametric equivalent to the L401E8, matching all critical electrical specifications and operating temperature range. Both parts are manufactured by Littelfuse Inc., carry Active product status, and maintain ROHS3 compliance. Selection of Q401E3 is appropriate for direct replacement in applications requiring identical performance characteristics.

Z0109MA 5AL2 (STMicroelectronics): This part is manufacturer-recommended as a substitute. It maintains compatibility in Triac Type, on-state current, and gate trigger voltage specifications. The off-state voltage rating is 600 V, providing higher voltage capability than the L401E8. The operating temperature range is -40°C ~ 125°C, which is narrower at the lower end. Current - Hold (Ih) is rated at 10 mA maximum, compared to 15 mA for the L401E8. This part is supplied in Cut Tape (CT) packaging and carries ROHS3 compliance and Active product status.

Frequently Asked Questions (FAQ)

Q: Can Q401E3 be used as a direct replacement for L401E8?

A: Yes. Q401E3 is a parametric equivalent with identical electrical specifications across all critical parameters: 400 V off-state voltage, 1 A on-state current, 1.3 V gate trigger voltage, and 10 mA gate trigger current. Both parts use Through Hole TO-92 packaging and operate across -65°C to 125°C. Both are ROHS3 compliant and Active in product status.

Q: What are the key differences between L401E8 and Z0109MA 5AL2?

A: Z0109MA 5AL2 has a higher off-state voltage rating of 600 V compared to 400 V for L401E8. The operating temperature minimum is -40°C for Z0109MA 5AL2 versus -65°C for L401E8. Current - Hold (Ih) is 10 mA for Z0109MA 5AL2 versus 15 mA for L401E8. All other electrical parameters remain compatible. Z0109MA 5AL2 is supplied in Cut Tape packaging rather than Bulk.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed parts use Through Hole mounting with TO-226-3 and TO-92-3 (TO-226AA) package designations, ensuring mechanical and footprint compatibility.

Q: What compliance certifications apply to these parts?

A: All three parts (L401E8, Q401E3, and Z0109MA 5AL2) are ROHS3 compliant and REACH unaffected. All carry EAR99 ECCN classification and HTSUS code 8541.30.0080.

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