Q6008LTH TRIAC Equivalent & Substitute Parts

Part Overview

The Q6008LTH is an internally triggered 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, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts must maintain electrical compatibility across voltage, current, and thermal operating ranges while accommodating variations in gate trigger characteristics and triac type classifications.

Key Parameters

Parameter	Q6008LTH
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	8 A
Current - Non Rep. Surge 50, 60Hz (Itsm)	83A, 100A
Current - Hold (Ih) (Max)	60 mA
Triac Type	Internally Triggered
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the Q6008LTH is determined by the following electrical and mechanical criteria:

Voltage Rating: All substitutes must maintain 600 V off-state voltage to ensure equivalent blocking capability
Current Rating: Substitutes rated at 6 A, 8 A, 10 A, or 12 A on-state current are acceptable; higher ratings provide design margin
Surge Current (Itsm): Must support equivalent or higher non-repetitive surge ratings at 50/60 Hz
Hold Current (Ih): Substitutes with lower hold current values (10 mA, 15 mA, 25 mA, 35 mA, 50 mA) are acceptable as they represent improved gate sensitivity
Package Compatibility: All substitutes use TO-220-3 standard package, compatible with Q6008LTH mounting footprint
Operating Temperature: All substitutes maintain -40°C to 125°C junction temperature range
Compliance: All substitutes are ROHS3 compliant and active products

Triac type variations (Internally Triggered, Alternistor - Snubberless, Logic - Sensitive Gate, Standard) represent different gate trigger architectures. Selection depends on circuit gate drive requirements and application sensitivity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Current - On State (Max)	Current - Non Rep. Surge (Itsm)	Current - Hold (Ih) (Max)	Triac Type	Operating Temperature	Product Status
Q6008LTH	Littelfuse Inc.	600 V	8 A	83A, 100A	60 mA	Internally Triggered	-40°C ~ 125°C	Discontinued
BTA06-600BWRG	STMicroelectronics	600 V	6 A	60A, 63A	50 mA	Alternistor - Snubberless	-40°C ~ 125°C	Active
BTA06-600CWRG	STMicroelectronics	600 V	6 A	60A, 63A	35 mA	Alternistor - Snubberless	-40°C ~ 125°C	Active
BTA06-600TWRG	STMicroelectronics	600 V	6 A	60A, 63A	10 mA	Logic - Sensitive Gate	-40°C ~ 125°C	Active
BTA08-600CWRG	STMicroelectronics	600 V	8 A	80A, 84A	35 mA	Alternistor - Snubberless	-40°C ~ 125°C	Active
BTA08-600SWRG	STMicroelectronics	600 V	8 A	80A, 84A	15 mA	Logic - Sensitive Gate	-40°C ~ 125°C	Active
BTA10-600BRG	STMicroelectronics	600 V	10 A	100A, 105A	50 mA	Standard	-40°C ~ 125°C	Active
BTA10-600CRG	STMicroelectronics	600 V	10 A	100A, 105A	25 mA	Standard	-40°C ~ 125°C	Active
BTA12-600BRG	STMicroelectronics	600 V	12 A	120A, 126A	50 mA	Standard	-40°C ~ 125°C	Active
BTA12-600CWRG	STMicroelectronics	600 V	12 A	120A, 126A	35 mA	Alternistor - Snubberless	-40°C ~ 125°C	Active
BTA12-600TWRG	STMicroelectronics	600 V	12 A	120A, 126A	10 mA	Logic - Sensitive Gate	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Direct Current Rating Match (8 A): BTA08-600CWRG and BTA08-600SWRG maintain the exact 8 A on-state current rating of the Q6008LTH. Both are active STMicroelectronics products with ROHS3 compliance. BTA08-600CWRG (Alternistor - Snubberless) provides 35 mA hold current; BTA08-600SWRG (Logic - Sensitive Gate) provides 15 mA hold current for applications requiring lower gate drive power.

Lower Current Rating Substitutes (6 A): BTA06-600BWRG, BTA06-600CWRG, and BTA06-600TWRG are suitable for applications where 6 A on-state current is sufficient. These parts offer reduced surge current ratings (60A, 63A) compared to the Q6008LTH (83A, 100A). BTA06-600TWRG provides the lowest hold current (10 mA) for sensitive gate applications.

Higher Current Rating Substitutes (10 A, 12 A): BTA10-600BRG, BTA10-600CRG, BTA12-600BRG, BTA12-600CWRG, and BTA12-600TWRG provide design margin with current ratings exceeding the Q6008LTH specification. These parts support higher surge currents (100A-126A) and are suitable for applications requiring increased thermal headroom or current capacity.

All substitute parts are active products with confirmed inventory availability and ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can BTA06 series parts directly replace Q6008LTH in all applications? A: BTA06 series parts are rated for 6 A on-state current, which is 25% lower than the Q6008LTH 8 A rating. Substitution is valid only if circuit design margins accommodate the reduced current capacity. Surge current ratings are also lower (60A, 63A vs. 83A, 100A).

Q: What is the difference between Alternistor - Snubberless and Logic - Sensitive Gate triac types? A: Alternistor - Snubberless types (BTA06-600BWRG, BTA06-600CWRG, BTA08-600CWRG, BTA12-600CWRG) feature reduced dI/dt sensitivity and are suitable for applications without external snubber networks. Logic - Sensitive Gate types (BTA06-600TWRG, BTA08-600SWRG, BTA12-600TWRG) require lower gate trigger current (5-10 mA) and hold current (10-15 mA), making them suitable for low-power gate drive circuits.

Q: Is the TO-220-3 package of substitute parts compatible with Q6008LTH mounting? A: All listed substitute parts use standard TO-220-3 package format compatible with Q6008LTH PCB footprints. The Q6008LTH isolated tab variant does not affect mechanical compatibility with standard TO-220-3 mounting.

Q: What is the significance of hold current (Ih) differences among substitutes? A: Hold current determines the minimum gate current required to maintain triac conduction. Lower hold current values (10 mA, 15 mA) reduce gate drive power requirements and are advantageous in low-power control circuits. Higher values (35 mA, 50 mA, 60 mA) provide greater noise immunity in electrically noisy environments.

Q: Are all substitute parts ROHS3 compliant? A: All listed STMicroelectronics substitute parts are ROHS3 compliant and carry REACH Unaffected or REACH Compliant status where specified in product documentation.

Q: Which substitute provides the closest electrical match to Q6008LTH? A: BTA08-600CWRG and BTA08-600SWRG maintain the 8 A on-state current rating. BTA08-600CWRG (Alternistor - Snubberless, 35 mA hold current) provides the closest hold current match to the Q6008LTH (60 mA), while BTA08-600SWRG (Logic - Sensitive Gate, 15 mA hold current) offers improved gate sensitivity for low-power applications.

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