L201E3 Equivalent & Substitute Parts

Part Overview

The L201E3 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 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 must maintain functional compatibility while meeting the electrical and mechanical requirements of the original application.

Key Parameters

Parameter	L201E3
Triac Type	Logic - Sensitive Gate
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	1 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	3 mA
Current - Hold (Ih) (Max)	5 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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the L201E3 are categorized based on the following substitution criteria:

Upgrade Substitutes (Littelfuse Inc.): Parts L401E3 and L601E3 maintain identical TRIAC type classification (Logic - Sensitive Gate), current ratings (1 A on-state), gate trigger current (3 mA maximum), hold current (5 mA maximum), operating temperature range (-65°C ~ 125°C), mounting type (Through Hole), and package configuration (TO-92-3). These parts differ in off-state voltage rating (400 V and 600 V respectively) and gate trigger voltage (1.3 V maximum versus 2 V maximum for the original). Both are Active status products from the same manufacturer.

Manufacturer Recommended Substitute (STMicroelectronics): Part Z0103MA 1AA2 matches the TRIAC type, current ratings (1 A on-state, 3 mA gate trigger), operating temperature range (-40°C ~ 125°C minimum), mounting type (Through Hole), and package configuration (TO-92-3). This part is rated for 600 V off-state voltage with 1.3 V maximum gate trigger voltage. Hold current is specified at 7 mA maximum. This part is Active status and carries REACH Unaffected certification.

Parameter Comparison

Parameter	L201E3	L401E3	L601E3	Z0103MA 1AA2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	STMicroelectronics
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	200 V	400 V	600 V	600 V
Current - On State (It (RMS)) (Max)	1 A	1 A	1 A	1 A
Voltage - Gate Trigger (Vgt) (Max)	2 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	5 mA	5 mA	7 mA
Operating Temperature	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C	-40°C ~ 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	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring 200 V off-state voltage: Direct substitution is not available among the provided alternatives. The L401E3 and L601E3 offer higher voltage ratings (400 V and 600 V respectively), which may be suitable if the application circuit can accommodate the increased voltage capability without adverse effects on system performance or cost.

For applications tolerant of higher voltage ratings: The L401E3 (400 V) and L601E3 (600 V) are Active status products from Littelfuse Inc., providing continuity with the original manufacturer. Both maintain identical current ratings, gate trigger specifications, and operating temperature range as the L201E3.

For cross-manufacturer substitution: The Z0103MA 1AA2 from STMicroelectronics is an Active status product rated for 600 V off-state voltage. This part is suitable for applications where manufacturer diversification is acceptable. The operating temperature minimum is -40°C (versus -65°C for Littelfuse parts), and the hold current maximum is 7 mA (versus 5 mA for the original). All parts carry ROHS3 compliance and are packaged in TO-92-3 configuration.

Frequently Asked Questions (FAQ)

Q: Can L401E3 or L601E3 directly replace L201E3 in all applications?

A: L401E3 and L601E3 maintain identical TRIAC type, current ratings, gate trigger specifications, and operating temperature range. The primary difference is higher off-state voltage rating. Substitution is valid if the application circuit design permits operation with 400 V or 600 V rated components. Circuit voltage stress analysis is required to confirm compatibility.

Q: What are the key differences between L601E3 and Z0103MA 1AA2?

A: Both parts are rated for 600 V off-state voltage, 1 A on-state current, and 3 mA gate trigger current in TO-92-3 packages. Differences include: Z0103MA 1AA2 has a minimum operating temperature of -40°C (versus -65°C for L601E3), and a maximum hold current of 7 mA (versus 5 mA for L601E3). Z0103MA 1AA2 is manufactured by STMicroelectronics rather than Littelfuse Inc.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. L201E3, L401E3, L601E3, and Z0103MA 1AA2 are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

Q: What is the significance of the gate trigger voltage difference (2 V for L201E3 versus 1.3 V for substitutes)?

A: Gate trigger voltage (Vgt) determines the voltage level required to initiate TRIAC conduction. The L201E3 requires a maximum of 2 V, while L401E3, L601E3, and Z0103MA 1AA2 require a maximum of 1.3 V. Lower gate trigger voltage in substitute parts may affect gate drive circuit design and timing characteristics. Circuit validation is necessary to confirm gate drive compatibility.

Q: Is the TO-92-3 package identical across all parts?

A: Yes. All parts use the TO-226-3 / TO-92-3 (TO-226AA) package configuration, ensuring mechanical and pin compatibility for Through Hole mounting applications.

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