L6X5 TRIAC Equivalent & Substitute Parts

Part Overview

The L6X5 is a Logic-Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 600V off-state voltage and 800mA on-state current in a DO-214AA surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across gate trigger characteristics, current ratings, and thermal operating ranges while accommodating different package configurations.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	800 mA
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	10 mA
Operating Temperature Range	-40°C ~ 110°C (TJ)
Mounting Type	Surface Mount
Configuration	Single
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the L6X5 is determined by the following criteria:

Primary Electrical Parameters:

Voltage - Off State: 600 V (exact match required)
Current - On State (It (RMS)) (Max): 800 mA minimum
Voltage - Gate Trigger (Vgt) (Max): 1.3 V maximum
Current - Gate Trigger (Igt) (Max): 5 mA maximum
Current - Hold (Ih) (Max): 10 mA maximum

Secondary Compatibility Factors:

Triac Type: Logic - Sensitive Gate
Configuration: Single
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 or equivalent

Substitute parts are grouped into two categories based on packaging and manufacturer:

Category 1 - Direct Littelfuse Equivalent: L6X5RP maintains identical electrical specifications with tape & reel packaging, differing only in supply format from the original DO-214 bulk packaging.

Category 2 - Cross-Manufacturer Alternatives: BT1308W-600D,115 and Z0103MN,135 provide functional equivalence with modified electrical parameters within acceptable tolerance ranges and alternative package configurations (SC-73).

Parameter Comparison

Parameter	L6X5	L6X5RP	BT1308W-600D,115	Z0103MN,135
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	WeEn Semiconductors	WeEn Semiconductors
Voltage - Off State	600 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	800 mA	800 mA	800 mA	1 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	2 V	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	5 mA	3 mA
Current - Hold (Ih) (Max)	10 mA	10 mA	10 mA	7 mA
Operating Temperature (TJ)	-40°C ~ 110°C	-40°C ~ 110°C	125°C	125°C
Package / Case	DO-214AA, SMB (3 Leads)	DO-214AA, SMB (3 Leads)	TO-261-4, TO-261AA (SC-73)	TO-261-4, TO-261AA (SC-73)
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

L6X5RP (Littelfuse Inc.) is the primary substitute for the L6X5. It maintains identical electrical specifications and operating temperature range while offering active product status and ROHS3 compliance. The only difference is packaging format (tape & reel versus bulk), making this a direct functional replacement with no circuit redesign required.

BT1308W-600D,115 (WeEn Semiconductors) is a qualified alternative when package form factor change is acceptable. This part exceeds the gate trigger voltage specification (2V maximum versus 1.3V), requiring circuit validation to confirm gate drive compatibility. The extended operating temperature to 125°C provides thermal margin. Package change from DO-214AA to SC-73 (TO-261-4) necessitates PCB layout modification.

Z0103MN,135 (WeEn Semiconductors) offers increased on-state current capacity (1A versus 800mA) with gate trigger voltage matching the original specification (1.3V maximum). Lower gate trigger and hold currents (3mA and 7mA respectively) may require gate drive circuit adjustment. Extended operating temperature to 125°C and SC-73 package configuration apply the same considerations as BT1308W-600D,115.

Selection priority: L6X5RP for direct replacement; BT1308W-600D,115 or Z0103MN,135 only when package change and circuit validation are feasible.

Frequently Asked Questions (FAQ)

Q: Can L6X5RP be used as a direct drop-in replacement for L6X5?

A: Yes. L6X5RP maintains identical electrical specifications, operating temperature range, and DO-214AA package configuration. The only difference is packaging format (tape & reel). No circuit modifications are required.

Q: What is the primary limitation of BT1308W-600D,115 as a substitute?

A: The gate trigger voltage (Vgt) maximum is 2V, compared to 1.3V for the L6X5. This higher threshold may affect gate drive circuit performance and requires validation before implementation. Additionally, the SC-73 package differs from the original DO-214AA, necessitating PCB layout changes.

Q: Is Z0103MN,135 suitable for applications requiring exactly 800mA on-state current?

A: Z0103MN,135 is rated for 1A on-state current, exceeding the 800mA requirement. This provides design margin but does not restrict its use in 800mA applications. Gate trigger and hold current specifications are lower (3mA and 7mA), which may require gate drive circuit adjustment.

Q: Do all substitute parts meet RoHS compliance requirements?

A: L6X5RP and BT1308W-600D,115 are ROHS3 compliant. Z0103MN,135 is RoHS compliant. Both certifications satisfy current regulatory requirements for electronic components.

Q: What package considerations apply when switching from L6X5 to BT1308W-600D,115 or Z0103MN,135?

A: The original L6X5 uses DO-214AA (SMB, 3-lead) package. Both WeEn alternatives use SC-73 (TO-261-4, TO-261AA) package. Physical dimensions and PCB footprints differ, requiring layout redesign and potential board rework.

Q: Are there thermal performance differences between the L6X5 and its substitutes?

A: L6X5 operates from -40°C to 110°C (TJ). L6X5RP maintains this range. BT1308W-600D,115 and Z0103MN,135 extend the upper limit to 125°C, providing additional thermal margin in high-temperature applications.

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