L6008L8 TRIAC Equivalent & Substitute Parts

Part Overview

The L6008L8 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 8 A on-state current in a TO-220-3 Isolated Tab package. This component is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	L6008L8 Specification
Manufacturer	Littelfuse Inc.
Triac Type	Logic - Sensitive Gate
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	10 mA
Current - Hold (Ih) (Max)	20 mA
Operating Temperature	-40°C ~ 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L6008L8 is determined by the following critical parameters:

Voltage Rating: Off-state voltage must be 600 V or higher
Current Rating: On-state current must be 8 A or higher to maintain or exceed original capacity
Gate Trigger Characteristics: Voltage-gate trigger (Vgt) and current-gate trigger (Igt) must be compatible with existing circuit design
Package Type: TO-220 variants (TO-220-3, TO-220-3 Isolated Tab, TO-220F, TO-220AB) are mechanically compatible
Triac Type: Logic - Sensitive Gate types provide direct functional equivalence; Alternistor - Snubberless and Standard types offer functional alternatives with different gate characteristics
Temperature Range: Operating temperature must support the application environment
Compliance: RoHS3 compliance required for regulatory alignment

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage - Off State	Current - On State (Max)	Vgt (Max)	Igt (Max)	Ih (Max)	Operating Temp	Package	Product Status
L6008L8	Littelfuse Inc.	Logic - Sensitive Gate	600 V	8 A	1.3 V	10 mA	20 mA	-40°C ~ 110°C	TO-220-3 Isolated Tab	Discontinued
BT137X-600E,127	WeEn Semiconductors	Logic - Sensitive Gate	600 V	8 A	1.5 V	10 mA	20 mA	-40°C ~ 125°C	TO-220-3 Full Pack, Isolated Tab	Active
BTA08-600SWRG	STMicroelectronics	Logic - Sensitive Gate	600 V	8 A	1.3 V	10 mA	15 mA	-40°C ~ 125°C	TO-220-3	Active
BTA06-600TWRG	STMicroelectronics	Logic - Sensitive Gate	600 V	6 A	1.3 V	5 mA	10 mA	-40°C ~ 125°C	TO-220-3	Active
BTA08-600CWRG	STMicroelectronics	Alternistor - Snubberless	600 V	8 A	1.3 V	35 mA	35 mA	-40°C ~ 125°C	TO-220-3	Active
BTA06-600BWRG	STMicroelectronics	Alternistor - Snubberless	600 V	6 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	Active
BTA06-600CWRG	STMicroelectronics	Alternistor - Snubberless	600 V	6 A	1.3 V	35 mA	35 mA	-40°C ~ 125°C	TO-220-3	Active
BTA10-600BRG	STMicroelectronics	Standard	600 V	10 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	Active
BTA10-600CRG	STMicroelectronics	Standard	600 V	10 A	1.3 V	25 mA	25 mA	-40°C ~ 125°C	TO-220-3	Active
BTA12-600BRG	STMicroelectronics	Standard	600 V	12 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	Active
BTA12-600CRG	STMicroelectronics	Standard	600 V	12 A	1.3 V	25 mA	25 mA	-40°C ~ 125°C	TO-220-3 Full Pack	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice)

BT137X-600E,127 from WeEn Semiconductors is the closest functional equivalent. It matches the L6008L8 in triac type (Logic - Sensitive Gate), voltage rating (600 V), current rating (8 A), gate trigger current (10 mA), and hold current (20 mA). The gate trigger voltage is slightly higher at 1.5 V versus 1.3 V, which remains within acceptable tolerance for most applications. Operating temperature extends to 125°C, exceeding the original specification. The part is in active production status with high inventory availability (5249 pcs).

Secondary Equivalent (Same Triac Type)

BTA08-600SWRG from STMicroelectronics provides identical electrical characteristics to the L6008L8 with matching gate trigger voltage (1.3 V) and current (10 mA). The hold current is slightly lower at 15 mA versus 20 mA. This part is in active production with the highest inventory availability (26100 pcs) and extended operating temperature range (-40°C ~ 125°C). Package is standard TO-220-3.

Functional Alternatives (Different Triac Type)

BTA08-600CWRG (Alternistor - Snubberless, 8 A) and BTA10-600CRG (Standard, 10 A) provide higher current capacity and matching voltage ratings. These alternatives require circuit evaluation due to different gate characteristics (higher Igt and Ih values). BTA10-600CRG and BTA12-600CRG offer increased current headroom for applications requiring higher surge capacity.

Compliance and Availability

All recommended substitutes maintain RoHS3 compliance and are in active production status. BTA08-600SWRG and BTA12-600BRG offer the highest inventory levels, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can BT137X-600E,127 directly replace L6008L8 without circuit modification?

A: Yes. BT137X-600E,127 is functionally equivalent with matching voltage, current, and gate trigger current ratings. The gate trigger voltage is 1.5 V versus 1.3 V on the original, which is within normal design tolerance for sensitive-gate TRIACs. No circuit modification is required.

Q: What is the difference between Logic - Sensitive Gate and Alternistor - Snubberless TRIACs?

A: Logic - Sensitive Gate TRIACs require lower gate trigger current (typically 5-10 mA) and are optimized for low-power gate drive circuits. Alternistor - Snubberless TRIACs have higher gate trigger current requirements (25-50 mA) but offer improved EMI performance and reduced snubber network requirements. Substituting between these types requires circuit evaluation.

Q: Can I use BTA06-600TWRG (6 A) instead of L6008L8 (8 A)?

A: BTA06-600TWRG is rated for 6 A on-state current, which is lower than the original 8 A specification. This substitution is only acceptable if the application load current does not exceed 6 A RMS. Verify actual circuit current requirements before selection.

Q: Are TO-220-3 and TO-220-3 Isolated Tab packages mechanically interchangeable?

A: Both packages use the same three-pin TO-220 footprint and are mechanically compatible on standard PCB layouts. The "Isolated Tab" designation indicates electrical isolation of the mounting tab from the device terminals, which is a thermal and safety feature. Verify isolation requirements for your application.

Q: What is the significance of the extended operating temperature range on substitute parts?

A: Substitute parts rated to 125°C (versus 110°C on the original) provide additional thermal margin and are suitable for higher ambient temperature environments. This is a beneficial characteristic that does not require circuit modification.

Q: Why do some substitutes have higher gate trigger current (Igt) values?

A: Higher Igt values indicate the gate drive circuit must supply more current to trigger the TRIAC. This affects gate resistor selection and driver circuit design. Logic - Sensitive Gate types (5-10 mA) are optimized for low-power gate circuits, while Standard and Alternistor types (25-50 mA) require more robust gate drive. Verify gate drive capability before substitution.

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