L6004V6 TRIAC Equivalent & Substitute Parts

Part Overview

The L6004V6 is a Logic - Sensitive Gate TRIAC rated for 600 V off-state voltage and 4 A on-state current, manufactured by Littelfuse Inc. in a TO-251 through-hole package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility across gate trigger characteristics, current ratings, and thermal operating ranges while accommodating package variations.

Key Parameters

Parameter	L6004V6
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	4 A
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	Through Hole
Package / Case	TO-251-3 Short Leads, IPak, TO-251AA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Voltage - Off State: 600 V (exact match required)
Current - On State (It (RMS)) (Max): 4 A (exact match required)
Triac Type: Logic - Sensitive Gate or equivalent functional class
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Secondary Compatibility Considerations:

Voltage - Gate Trigger (Vgt) (Max): 1.3 V or lower (ensures gate sensitivity compatibility)
Current - Gate Trigger (Igt) (Max): 5 mA or lower (ensures gate drive compatibility)
Current - Hold (Ih) (Max): 10 mA or lower (ensures holding current compatibility)
Operating Temperature Range: Must support -40°C minimum; upper limit may vary

Package Variations Allowed:

TO-251 package variants (TO-251-3 Short Leads, IPak, TO-251AA, SOT-82-3)

Parts meeting these criteria are classified as direct substitutes. Parts with higher gate trigger parameters or different TRIAC types are listed as alternative options with noted parameter differences.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Current - On State (Max)	Vgt (Max)	Igt (Max)	Ih (Max)	Operating Temp Range	Package	Product Status
L6004V6	Littelfuse Inc.	600 V	4 A	1.3 V	5 mA	10 mA	-40°C ~ 110°C	TO-251	Discontinued
L6004V6TP	Littelfuse Inc.	600 V	4 A	1.3 V	5 mA	10 mA	-40°C ~ 110°C	TO-251	Active
T405-600H	STMicroelectronics	600 V	4 A	1.3 V	5 mA	10 mA	-40°C ~ 125°C	TO-251	Active
T410-600H	STMicroelectronics	600 V	4 A	1.3 V	10 mA	15 mA	-40°C ~ 125°C	TO-251	Active
T435-600H	STMicroelectronics	600 V	4 A	1.3 V	35 mA	35 mA	-40°C ~ 125°C	TO-251	Active
BT134-600D,127	WeEn Semiconductors	600 V	4 A	1.5 V	5 mA	10 mA	-40°C ~ 125°C	SOT-82	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Parameters):

L6004V6TP is the primary direct substitute. It is manufactured by Littelfuse Inc., maintains all electrical parameters of the original L6004V6, and is currently in active production status with 887 units in stock. The only difference is packaging format (Tube vs. original specification), which does not affect electrical performance.

T405-600H is a direct electrical substitute manufactured by STMicroelectronics. It matches all critical parameters (Vgt, Igt, Ih) and extends the upper operating temperature to 125°C, providing improved thermal margin. Product status is Active with 5,300 units in stock.

Compatible Alternatives (Parameter Variations):

T410-600H is compatible with higher gate trigger and hold current specifications (Igt: 10 mA, Ih: 15 mA vs. 5 mA and 10 mA respectively). This part is suitable for applications with less stringent gate drive requirements. Active status with 16,096 units in stock.

T435-600H is a Snubberless Alternistor TRIAC with significantly higher gate trigger and hold currents (Igt: 35 mA, Ih: 35 mA). This part is suitable only for applications where snubberless operation is required and gate drive capability is not a limiting factor. Active status with 3,902 units in stock.

BT134-600D,127 is manufactured by WeEn Semiconductors with a SOT-82 package variant. Gate trigger voltage is 1.5 V (vs. 1.3 V), which may require circuit verification for gate drive compatibility. Package change from TO-251 to SOT-82 requires PCB layout modification. Active status with 1,000,200 units in stock.

Compliance and Certifications:

All substitute parts are ROHS3 Compliant and carry EAR99 ECCN classification. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can L6004V6TP be used as a direct replacement for L6004V6?

A: Yes. L6004V6TP is electrically identical to L6004V6 with matching voltage, current, and gate trigger specifications. The difference is packaging format (Tube). Both are manufactured by Littelfuse Inc. and are ROHS3 compliant.

Q: What is the difference between T405-600H and T410-600H?

A: Both are STMicroelectronics Logic - Sensitive Gate TRIACs with identical voltage and current ratings. T410-600H has higher gate trigger current (Igt: 10 mA vs. 5 mA) and hold current (Ih: 15 mA vs. 10 mA). T405-600H is the closer electrical match to L6004V6. T410-600H is suitable for applications with less demanding gate drive requirements.

Q: Why does T435-600H have higher gate trigger current?

A: T435-600H is classified as an Alternistor - Snubberless TRIAC, a different functional class from the Logic - Sensitive Gate type. The higher gate trigger current (35 mA) and hold current (35 mA) are inherent to snubberless TRIAC design. This part is suitable only for applications specifically requiring snubberless operation.

Q: Can BT134-600D,127 be used in place of L6004V6?

A: BT134-600D,127 maintains the same voltage and current ratings but has a higher gate trigger voltage (1.5 V vs. 1.3 V) and uses a different package (SOT-82 vs. TO-251). Gate drive circuit verification is required to confirm adequate gate voltage margin. PCB layout modification is necessary due to package change.

Q: What is the impact of operating temperature range differences?

A: L6004V6 operates from -40°C to 110°C. Most substitutes extend the upper limit to 125°C. This provides additional thermal margin but does not affect compatibility in applications operating within the original -40°C to 110°C range. Applications requiring operation above 110°C must use substitutes with extended temperature ratings.

Q: Are all substitute parts through-hole mounted?

A: Yes, with one exception. L6004V6TP, T405-600H, T410-600H, and T435-600H use TO-251 through-hole packages. BT134-600D,127 uses SOT-82 through-hole package, which requires different PCB footprint and layout.

Q: What does ROHS3 Compliant mean?

A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting lead, cadmium, mercury, and other hazardous substances. All listed substitutes meet this standard.

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