Littelfuse L201E8 TRIAC Equivalent & Substitute Parts

Part Overview

The Littelfuse L201E8 is a Logic - Sensitive Gate TRIAC rated for 200 V off-state voltage with 1 A on-state current in a Through Hole TO-92 package. This component is classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts maintain functional compatibility while offering enhanced voltage ratings or active product status from current manufacturers.

Key Parameters

Parameter	L201E8
Triac Type	Logic - Sensitive Gate
Voltage - Off State	200 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
Operating Temperature	-65°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L201E8 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Triac Type: Logic - Sensitive Gate
Current - On State (It (RMS)) (Max): 1 A
Voltage - Gate Trigger (Vgt) (Max): 1.3 V
Current - Gate Trigger (Igt) (Max): 10 mA
Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA)

Allowable Variation Parameters:

Voltage - Off State: May be equal or higher (200 V, 400 V, or 600 V)
Current - Hold (Ih) (Max): May be equal or lower
Operating Temperature: May be equal or wider range
Current - Non Rep. Surge: May vary within manufacturer specifications

Substitute parts are grouped by voltage rating upgrade capability while maintaining all other electrical and mechanical specifications within acceptable tolerances.

Parameter Comparison

Parameter	L201E8 (Littelfuse)	L401E8 (Littelfuse)	L601E8 (Littelfuse)	Z0109MA 1AA2 (STMicroelectronics)	Z0109MA 5AL2 (STMicroelectronics)
Voltage - Off State	200 V	400 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	1 A	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	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA	10 mA	10 mA	10 mA	10 mA
Current - Hold (Ih) (Max)	15 mA	15 mA	15 mA	10 mA	10 mA
Operating Temperature	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Littelfuse L401E8: Direct upgrade path with 400 V off-state voltage rating. Maintains all other electrical parameters identical to the L201E8. Active product status with full manufacturer support. Suitable for applications requiring higher voltage margin while preserving original circuit behavior.

Littelfuse L601E8: Extended voltage rating to 600 V off-state. Maintains all other electrical parameters identical to the L201E8. Active product status with full manufacturer support. Recommended for applications requiring maximum voltage headroom.

STMicroelectronics Z0109MA 1AA2: Manufacturer-recommended equivalent with 600 V off-state voltage rating. Maintains gate trigger specifications and on-state current. Operating temperature range reduced to -40°C ~ 125°C. Current - Hold (Ih) reduced to 10 mA maximum. Active product status with high inventory availability. Bulk packaging.

STMicroelectronics Z0109MA 5AL2: Manufacturer-recommended equivalent with 600 V off-state voltage rating. Identical electrical specifications to Z0109MA 1AA2. Available in Cut Tape (CT) packaging for automated assembly. Active product status with adequate inventory availability.

All substitute parts maintain ROHS3 compliance and EAR99 export classification. Selection between Littelfuse and STMicroelectronics options depends on supply chain preference, packaging requirements, and temperature range constraints.

Frequently Asked Questions (FAQ)

Q: Can the L401E8 be used as a direct replacement for the L201E8?

A: Yes. The L401E8 maintains identical electrical specifications for gate trigger voltage, on-state current, gate trigger current, and hold current. The 400 V off-state voltage rating is a direct upgrade that does not affect circuit compatibility in applications originally designed for 200 V operation.

Q: What is the difference between the Littelfuse L601E8 and STMicroelectronics Z0109MA series?

A: Both provide 600 V off-state voltage and 1 A on-state current with identical gate trigger specifications. Key differences are: Littelfuse L601E8 maintains -65°C ~ 125°C operating temperature and 15 mA maximum hold current; STMicroelectronics Z0109MA series operates -40°C ~ 125°C with 10 mA maximum hold current. Selection depends on temperature range requirements and manufacturer preference.

Q: Are the Z0109MA 1AA2 and Z0109MA 5AL2 electrically equivalent?

A: Yes. Both parts are electrically identical with 600 V off-state voltage, 1 A on-state current, and matching gate trigger specifications. The difference is packaging: Z0109MA 1AA2 is supplied in Bulk; Z0109MA 5AL2 is supplied in Cut Tape (CT) for automated assembly.

Q: Does the reduced hold current (Ih) in STMicroelectronics parts affect compatibility?

A: The STMicroelectronics Z0109MA series specifies 10 mA maximum hold current compared to 15 mA in Littelfuse parts. This represents a tighter specification that does not prevent substitution. Circuits designed for the L201E8 will function with the lower hold current specification.

Q: What packaging options are available for these substitute parts?

A: Littelfuse L401E8 and L601E8 are supplied in Bulk packaging. STMicroelectronics Z0109MA 1AA2 is supplied in Bulk; Z0109MA 5AL2 is supplied in Cut Tape (CT). All parts use identical TO-92-3 (TO-226AA) physical package.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original L201E8 specification.

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