L401E3 Equivalent & Substitute Parts

Part Overview

The L401E3 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. Alternative models become necessary when design requirements demand higher voltage ratings, different thermal operating ranges, or when primary inventory availability is constrained.

Substiute Parts

L401E3

Littelfuse Inc.In Stock: 2255L401E3 Datasheet

Current PartRFQ

Z0103MA 1AA2

STMicroelectronicsIn Stock: 90422Z0103MA 1AA2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L401E3 is determined by the following critical parameters:

• Triac Type: Must remain Logic - Sensitive Gate
• Current - On State (It (RMS)) (Max): Must be ≥ 1 A
• Voltage - Gate Trigger (Vgt) (Max): Must be ≤ 1.3 V
• Current - Gate Trigger (Igt) (Max): Must be ≤ 3 mA
• Current - Hold (Ih) (Max): Must be ≤ 5 mA
• Mounting Type: Must be Through Hole
• Package / Case: Must be TO-92-3 or compatible TO-226-3

The Z0103MA 1AA2 qualifies as a substitute because it maintains the same Triac Type, gate trigger characteristics, and package configuration while offering a higher off-state voltage rating (600 V vs. 400 V), which provides design margin in higher-voltage applications.

Parameter Comparison

Engineering Selection Recommendations

Both the L401E3 and Z0103MA 1AA2 are Active products with ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The Z0103MA 1AA2 is suitable for applications requiring higher off-state voltage margin (600 V vs. 400 V) while maintaining identical gate trigger specifications. The L401E3 supports a wider operating temperature range (-65°C to 125°C vs. -40°C to 125°C). Selection between these parts depends on circuit voltage requirements and thermal environment constraints.

Frequently Asked Questions (FAQ)

Q: Can the Z0103MA 1AA2 directly replace the L401E3 in all applications?

A: The Z0103MA 1AA2 is electrically compatible for gate trigger and on-state current specifications. The higher off-state voltage rating (600 V) provides design margin in circuits operating below 400 V. The narrower operating temperature range (-40°C to 125°C) must be verified against application requirements if operation below -40°C is needed.

Q: Are the packages physically identical?

A: Both parts use the TO-92-3 package (TO-226-3 designation). Physical dimensions and pin configurations are compatible for Through Hole mounting.

Q: What compliance certifications apply to both parts?

A: Both the L401E3 and Z0103MA 1AA2 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Q: How do the hold current specifications differ?

A: The L401E3 specifies a maximum hold current (Ih) of 5 mA, while the Z0103MA 1AA2 specifies 7 mA. Both values remain within acceptable ranges for Logic - Sensitive Gate TRIAC applications.

Q: Which part should be selected for new designs?

A: Selection is based on circuit voltage requirements. For circuits operating at or below 400 V, either part is suitable. For circuits requiring higher voltage margin or where 600 V rated components are preferred, the Z0103MA 1AA2 is the appropriate choice.