Equivalent & Substitute Parts for L2X3 TRIAC

Part Overview

The L2X3 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 800 mA on-state current in a DO-214AA surface mount package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 110°C and complies with RoHS3 standards.

Key Parameters

Parameter	L2X3
Manufacturer	Littelfuse Inc.
Triac Type	Logic - Sensitive Gate
Voltage - Off State	200 V
Current - On State (It RMS Max)	800 mA
Voltage - Gate Trigger (Vgt Max)	1.3 V
Current - Gate Trigger (Igt Max)	3 mA
Current - Hold (Ih Max)	5 mA
Operating Temperature	-40°C to 110°C
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB (3 Leads)
RoHS Status	RoHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the L2X3 is determined by the following critical parameters:

Triac Type: Logic - Sensitive Gate configuration must be maintained
Gate Trigger Characteristics: Voltage (Vgt) and current (Igt) specifications must be compatible with circuit design
Current Rating: On-state current (It RMS) must meet or exceed application requirements
Voltage Rating: Off-state voltage must equal or exceed the original specification
Gate Hold Current (Ih): Must be within acceptable circuit operating margins
Mounting and Package: Surface mount configuration with compatible pinout
Compliance: RoHS compliance and operating temperature range

The identified substitutes BT131W-600,135 and Z0103MN,135 are both Logic - Sensitive Gate TRIACs in surface mount packages with higher voltage ratings (600 V) and current capabilities (1 A), making them suitable for applications requiring the L2X3 while offering enhanced performance margins.

Parameter Comparison

Parameter	L2X3	BT131W-600,135	Z0103MN,135
Manufacturer	Littelfuse Inc.	WeEn Semiconductors	WeEn Semiconductors
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate
Voltage - Off State	200 V	600 V	600 V
Current - On State (It RMS Max)	800 mA	1 A	1 A
Voltage - Gate Trigger (Vgt Max)	1.3 V	1.5 V	1.3 V
Current - Gate Trigger (Igt Max)	3 mA	3 mA	3 mA
Current - Hold (Ih Max)	5 mA	5 mA	7 mA
Operating Temperature (TJ)	-40°C to 110°C	125°C	125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB (3 Leads)	TO-261-4, TO-261AA	TO-261-4, TO-261AA
RoHS Status	RoHS3 Compliant	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

Both BT131W-600,135 and Z0103MN,135 are active production components from WeEn Semiconductors, providing long-term availability compared to the obsolete L2X3. Selection between these substitutes depends on circuit-specific requirements:

BT131W-600,135 offers a gate trigger voltage (Vgt) of 1.5 V maximum, which is 0.2 V higher than the L2X3 specification. This part maintains the 5 mA hold current specification and is suitable for applications where the higher gate trigger threshold is acceptable.

Z0103MN,135 maintains the 1.3 V maximum gate trigger voltage specification identical to the L2X3, providing closer electrical compatibility. The hold current specification is 7 mA maximum, which is 2 mA higher than the original part.

Both substitutes provide 600 V off-state voltage and 1 A on-state current, exceeding the L2X3 ratings and offering improved performance margins. Both are RoHS compliant and rated to 125°C junction temperature, extending the operating temperature range beyond the original -40°C to 110°C specification.

Frequently Asked Questions (FAQ)

Q: Can the L2X3 be directly replaced with BT131W-600,135 or Z0103MN,135?

A: Both parts are Logic - Sensitive Gate TRIACs in surface mount packages with compatible pinout configurations. The higher voltage and current ratings make them suitable for L2X3 applications. However, the package transition from DO-214AA to TO-261-4 requires PCB layout verification to confirm mechanical fit and thermal performance.

Q: What is the difference between BT131W-600,135 and Z0103MN,135?

A: The primary difference is the gate trigger voltage specification. Z0103MN,135 maintains the 1.3 V maximum Vgt of the L2X3, while BT131W-600,135 specifies 1.5 V maximum. Z0103MN,135 also has a higher hold current rating of 7 mA versus 5 mA for BT131W-600,135. Both parts are electrically and mechanically compatible substitutes.

Q: Are there package compatibility concerns?

A: The L2X3 uses DO-214AA (SMB) packaging, while both substitutes use TO-261-4 (TO-261AA) packaging. Although both are surface mount configurations with three leads, the physical dimensions and footprint differ. PCB redesign may be required to accommodate the new package geometry.

Q: Do the substitutes maintain RoHS compliance?

A: Yes, both BT131W-600,135 and Z0103MN,135 are RoHS compliant. The L2X3 is RoHS3 compliant, while the substitutes are RoHS compliant, meeting regulatory requirements for electronic component use.

Q: What are the implications of the higher voltage rating?

A: The 600 V off-state voltage rating of both substitutes exceeds the L2X3 specification of 200 V. This provides additional safety margin in applications operating below 200 V and allows the substitutes to be used in higher voltage circuits where the L2X3 cannot be applied.

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