Q6008R4 TRIAC 600V 8A TO-220AB Equivalent & Substitute Parts

Part Overview

The Q6008R4 is a standard TRIAC thyristor rated for 600V off-state voltage and 8A on-state current, packaged in TO-220AB through-hole configuration. Manufactured by Littelfuse Inc., this component is discontinued at DiGi Electronics. Equivalent and substitute parts are available from active manufacturers including NXP USA Inc., WeEn Semiconductors, and STMicroelectronics, offering continued design support and supply chain availability.

Key Parameters

Parameter	Q6008R4
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)	25 mA
Current - Hold (Ih) (Max)	50 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	83A, 100A
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic is based on the following critical parameters:

Voltage Rating (Off State): All substitutes maintain 600V rating for direct voltage compatibility
Current Rating (On State): Substitutes range from 8A to 12A, accommodating designs with equal or higher current capacity
Package Type: All substitutes use TO-220-3 through-hole configuration for mechanical and thermal compatibility
Gate Trigger Parameters: Vgt and Igt values remain within acceptable ranges for gate drive circuit compatibility
Operating Temperature Range: Substitutes support minimum -40°C to 125°C or higher
Triac Type: Both Standard and Alternistor (Snubberless) types are included; Alternistor types offer enhanced EMI performance

Substitutes are grouped by current rating and triac type to facilitate selection based on application requirements.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage - Off State	Current - On State (Max)	Vgt (Max)	Igt (Max)	Ih (Max)	Operating Temp	Product Status
Q6008R4	Littelfuse Inc.	Standard	600 V	8 A	1.3 V	25 mA	50 mA	-40°C ~ 125°C	Discontinued
BTA08-600BWRG	STMicroelectronics	Alternistor - Snubberless	600 V	8 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	Active
BTB08-600BWRG	STMicroelectronics	Alternistor - Snubberless	600 V	8 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	Active
BTA10-600BRG	STMicroelectronics	Standard	600 V	10 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	Active
BTA10-600BWRG	STMicroelectronics	Alternistor - Snubberless	600 V	10 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	Active
BTA410-600BT,127	WeEn Semiconductors	Standard	600 V	10 A	1.5 V	50 mA	60 mA	125°C	Active
BT138-600G,127	NXP USA Inc.	Standard	600 V	12 A	1.5 V	50 mA	60 mA	125°C	Active
BT138-600G0TQ	WeEn Semiconductors	Standard	600 V	12 A	1 V	100 mA	60 mA	150°C	Active
BTA212-600B/DG,127	NXP USA Inc.	Standard	600 V	12 A	1.5 V	50 mA	60 mA	125°C	Active
BTA312-600B,127	WeEn Semiconductors	Standard	600 V	12 A	1.5 V	50 mA	60 mA	125°C	Active
BTA312-600B/DG,127	NXP USA Inc.	Standard	600 V	12 A	1.5 V	50 mA	60 mA	125°C	Active

Engineering Selection Recommendations

Direct Current Rating Match (8A): BTA08-600BWRG and BTB08-600BWRG from STMicroelectronics provide identical 8A current ratings with Alternistor (Snubberless) technology. Both maintain the -40°C to 125°C operating range and ROHS3 compliance of the original Q6008R4. These are preferred for applications requiring exact current specification without design margin.

Higher Current Capacity (10A): BTA10-600BRG and BTA10-600BWRG from STMicroelectronics offer 10A ratings with identical gate trigger voltage (1.3V) and full temperature range support. These provide design margin for applications with potential current growth or thermal stress.

Higher Current Capacity (12A): BT138-600G,127 (NXP), BT138-600G0TQ (WeEn), BTA212-600B/DG,127 (NXP), BTA312-600B,127 (WeEn), and BTA312-600B/DG,127 (NXP) all provide 12A ratings. These are suitable for applications requiring significant current headroom. Note that gate trigger voltage increases to 1.5V maximum (except BT138-600G0TQ at 1V), requiring gate drive circuit verification.

Active Product Status: All recommended substitutes maintain active product status with established supply chains. The Q6008R4 discontinuation necessitates migration to one of these alternatives.

Compliance Considerations: All substitutes maintain ROHS3 compliance or equivalent environmental certifications. Moisture sensitivity level remains at MSL 1 (Unlimited) across all options.

Frequently Asked Questions (FAQ)

Q: Can I use a 12A TRIAC as a direct replacement for the 8A Q6008R4?

A: Yes. The 12A TRIACs (BT138, BTA212, BTA312 series) are electrically compatible with the Q6008R4 in applications designed for 8A operation. The higher current rating provides design margin without affecting circuit function at lower currents. Verify gate drive circuit compatibility, as Vgt maximum increases to 1.5V on most 12A options.

Q: What is the difference between Standard and Alternistor (Snubberless) TRIAC types?

A: Alternistor technology (BTA08-600BWRG, BTB08-600BWRG, BTA10-600BWRG) provides improved EMI performance and reduced snubber circuit requirements compared to Standard types. Both are electrically compatible with the Q6008R4 in TO-220-3 package. Selection depends on application EMI sensitivity.

Q: Are all substitutes pin-compatible with the Q6008R4?

A: Yes. All substitutes use TO-220-3 package configuration with identical pin assignments (Gate, MT1, MT2). Through-hole mounting is identical across all options.

Q: Does gate trigger voltage variation affect circuit design?

A: The Q6008R4 specifies Vgt maximum of 1.3V. Most 12A substitutes specify 1.5V maximum, which is within typical gate drive circuit margins. BT138-600G0TQ specifies 1V maximum, offering tighter tolerance. Verify gate drive circuit can reliably trigger across the specified Vgt range of your selected substitute.

Q: Which substitute offers the best thermal performance?

A: BT138-600G0TQ from WeEn Semiconductors supports 150°C junction temperature, compared to 125°C on most alternatives. This provides additional thermal margin in high-temperature applications.

Q: Can I mix different substitute part numbers in the same design?

A: All substitutes are mechanically and electrically compatible within the specified parameter ranges. However, maintaining consistent part numbers across production runs simplifies supply chain management and qualification testing.

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