L6X3 TRIAC Equivalent & Substitute Parts

Part Overview

The L6X3 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 600 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. Substitute parts must maintain electrical compatibility across gate trigger characteristics, thermal ratings, and package form factors while meeting current product availability and compliance standards.

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)	3 mA
Current - Hold (Ih) (Max)	5 mA
Operating Temperature Range	-40°C ~ 110°C (TJ)
Package / Case	DO-214AA, SMB (3 Leads)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the L6X3 is determined by the following critical parameters:

Primary Compatibility Criteria:

Voltage - Off State: 600 V (exact match required)
Triac Type: Logic - Sensitive Gate (functional equivalence)
Gate Trigger Voltage (Vgt) (Max): ≤ 1.3 V (ensures gate drive compatibility)
Gate Trigger Current (Igt) (Max): ≤ 3 mA (ensures control circuit compatibility)
Current - Hold (Ih) (Max): ≤ 5 mA (ensures holding stability)
Configuration: Single (functional requirement)
Mounting Type: Surface Mount (assembly compatibility)

Secondary Compatibility Criteria:

Current - On State (It (RMS)) (Max): ≥ 800 mA (equal or higher current capacity acceptable)
Operating Temperature: ≥ -40°C ~ 110°C (equal or wider range acceptable)
Package compatibility: DO-214AA or equivalent surface mount packages

Substitute parts meeting these criteria are electrically and mechanically compatible with the L6X3 in equivalent circuit applications.

Parameter Comparison

Parameter	L6X3	L6X3RP	BT131W-600,135	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	1 A	1 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.5 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 (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	TO-261-4, TO-261AA
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant

Engineering Selection Recommendations

L6X3RP (Littelfuse Inc.) is the primary direct substitute. This part maintains identical electrical specifications and package form factor as the L6X3, with the distinction of active product status and Tape & Reel packaging availability. ROHS3 compliance is maintained. Selection of L6X3RP eliminates package redesign requirements and preserves thermal performance characteristics within the original operating range.

BT131W-600,135 (WeEn Semiconductors) and Z0103MN,135 (WeEn Semiconductors) are functional substitutes with higher current capacity (1 A vs. 800 mA) and extended operating temperature range (125°C vs. 110°C). Both parts maintain the 600 V off-state voltage and 3 mA gate trigger current specification. BT131W-600,135 specifies a maximum gate trigger voltage of 1.5 V, which exceeds the L6X3 specification of 1.3 V. Z0103MN,135 maintains the 1.3 V gate trigger voltage specification and is available in higher inventory quantity (50,903 pcs). Both parts require package redesign due to SC-73 package form factor, which differs from the DO-214AA package of the L6X3.

Selection between these substitutes depends on design constraints: L6X3RP for direct replacement without redesign; BT131W-600,135 or Z0103MN,135 for applications where higher current capacity and extended temperature range provide design margin, with Z0103MN,135 preferred for gate trigger voltage specification alignment.

Frequently Asked Questions (FAQ)

Q: Can L6X3RP be used as a direct replacement for L6X3? A: Yes. L6X3RP is electrically and mechanically identical to L6X3, with identical voltage, current, and gate trigger specifications. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel availability). No circuit or PCB modifications are required.

Q: What is the difference between L6X3RP and the WeEn Semiconductors substitutes? A: L6X3RP maintains the DO-214AA package and 800 mA current rating. BT131W-600,135 and Z0103MN,135 offer higher current capacity (1 A) and extended operating temperature (125°C), but require package redesign due to SC-73 form factor. Gate trigger voltage differs: BT131W-600,135 specifies 1.5 V maximum (vs. 1.3 V for L6X3), while Z0103MN,135 maintains 1.3 V specification.

Q: Are package changes required when substituting with BT131W-600,135 or Z0103MN,135? A: Yes. Both parts use SC-73 package (TO-261-4, TO-261AA), which differs from the L6X3 DO-214AA package. PCB layout and footprint redesign is necessary. Pin configuration must be verified during design integration.

Q: Which substitute offers the best inventory availability? A: Z0103MN,135 has the highest inventory (50,903 pcs), followed by L6X3RP (1,084 pcs) and BT131W-600,135 (678 pcs). Inventory levels should be confirmed with suppliers for production planning.

Q: Do all substitutes meet RoHS compliance? A: Yes. L6X3RP maintains ROHS3 compliance. BT131W-600,135 and Z0103MN,135 are RoHS Compliant. All parts meet environmental compliance requirements for current manufacturing standards.

Q: What is the maximum gate trigger voltage difference between substitutes? A: L6X3 and L6X3RP specify 1.3 V maximum. Z0103MN,135 also specifies 1.3 V. BT131W-600,135 specifies 1.5 V maximum, representing a 0.2 V increase. Gate drive circuits must accommodate this specification variance.

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