L401E6 Equivalent & Substitute Parts

Part Overview

The L401E6 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. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits voltage or performance parameter variations within application tolerances.

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	-65°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the L401E6 are classified into two categories based on parametric equivalence and manufacturer recommendation:

Parametric Equivalent (L401E5): This part maintains identical electrical specifications across all critical parameters including off-state voltage (400 V), on-state current (1 A), gate trigger voltage (1.3 V maximum), and operating temperature range (-65°C ~ 125°C). The L401E5 differs only in inventory availability and supplier packaging format (Bulk vs. standard distribution). This classification permits direct substitution without circuit redesign.

Manufacturer Recommended Substitute (Z0109MA 5AL2): This STMicroelectronics part is a Logic - Sensitive Gate TRIAC with elevated off-state voltage rating (600 V) and identical on-state current (1 A). The Z0109MA 5AL2 maintains compatible gate trigger voltage (1.3 V maximum) and hold current (10 mA maximum) specifications. Key differences include reduced non-repetitive surge current ratings (8 A, 8.5 A versus 16.7 A, 20 A) and narrower operating temperature range (-40°C ~ 125°C versus -65°C ~ 125°C). This part is suitable for applications where higher voltage margin is acceptable and surge current requirements do not exceed the specified limits.

Parameter Comparison

Parameter	L401E6 (Main)	L401E5 (Parametric Equivalent)	Z0109MA 5AL2 (Manufacturer Recommended)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	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 - Non Rep. Surge 50, 60Hz (Itsm)	16.7 A, 20 A	16.7 A, 20 A	8 A, 8.5 A
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	10 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	10 mA
Operating Temperature	-65°C ~ 125°C (TJ)	-65°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)	TO-226-3, TO-92-3 (TO-226AA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

L401E5 Selection: The L401E5 is the preferred substitute when direct parametric equivalence is required. All electrical and thermal specifications are identical to the L401E6, ensuring no circuit redesign or application re-qualification is necessary. Both parts maintain Active product status and full ROHS3 compliance. Selection of L401E5 is appropriate for immediate replacement in existing designs without performance or reliability impact.

Z0109MA 5AL2 Selection: The Z0109MA 5AL2 is suitable for applications where the 400 V voltage rating of the L401E6 provides design margin and the application can tolerate the reduced non-repetitive surge current specification (8 A, 8.5 A maximum). The elevated 600 V off-state voltage rating provides additional voltage headroom in circuits operating below 400 V nominal. The narrower operating temperature range (-40°C ~ 125°C) is acceptable for applications not requiring the extended low-temperature performance of the L401E6 (-65°C minimum). Both parts maintain Active status and ROHS3 compliance. Circuit validation is recommended when surge current requirements approach or exceed 8 A.

Frequently Asked Questions (FAQ)

Q: Can L401E5 be used as a direct replacement for L401E6? A: Yes. The L401E5 is a parametric equivalent with identical voltage, current, and temperature specifications. No circuit modification is required.

Q: What are the key differences between L401E6 and Z0109MA 5AL2? A: The Z0109MA 5AL2 has a higher off-state voltage rating (600 V versus 400 V), lower non-repetitive surge current limits (8 A, 8.5 A versus 16.7 A, 20 A), higher gate trigger current (10 mA versus 5 mA maximum), and a narrower operating temperature range (-40°C to 125°C versus -65°C to 125°C).

Q: Is the Z0109MA 5AL2 suitable for all L401E6 applications? A: The Z0109MA 5AL2 is suitable for applications where non-repetitive surge current does not exceed 8 A and the operating temperature range does not fall below -40°C. The higher voltage rating does not degrade performance in lower-voltage circuits.

Q: Are all substitute parts in the same package? A: Yes. All three parts use the TO-226-3, TO-92-3 (TO-226AA) Through Hole package, ensuring mechanical and pin compatibility.

Q: Do all parts meet the same compliance standards? A: Yes. L401E6, L401E5, and Z0109MA 5AL2 are all ROHS3 Compliant and REACH Unaffected, with Active product status.

Q: What is the difference between Parametric Equivalent and Manufacturer Recommended classifications? A: Parametric Equivalent parts have identical electrical specifications and permit direct substitution. Manufacturer Recommended parts have some specification differences but are approved alternatives for applications where those differences are acceptable.

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