Q6008RH4 TRIAC Alternistor 600V 8A TO-220 Equivalent & Substitute Parts

Part Overview

The Q6008RH4 is a snubberless TRIAC Alternistor rated for 600V off-state voltage and 8A on-state current in a TO-220-3 through-hole package, manufactured by Littelfuse Inc. 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 gate trigger specifications while accommodating the through-hole TO-220 mounting requirement.

Key Parameters

Parameter	Q6008RH4 Specification
Voltage - Off State	600 V
Current - On State (It (RMS)) (Max)	8 A
Triac Type	Alternistor - Snubberless
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	35 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	83A, 100A
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Voltage - Off State: 600V minimum
Package / Case: TO-220-3 through-hole configuration
Mounting Type: Through Hole
Operating Temperature Range: Must support -40°C to 125°C minimum

Secondary Compatibility Criteria:

Current - On State (It (RMS)): 8A or higher
Voltage - Gate Trigger (Vgt): 1.3V or lower
Current - Gate Trigger (Igt): 35 mA or lower
Current - Hold (Ih): 35 mA or lower
Triac Type: Alternistor - Snubberless preferred for direct replacement; Standard type acceptable if electrical parameters align

Substitute parts are grouped into two categories:

Direct Equivalent (Snubberless Alternistor Type): BTA08-600CWRG maintains identical Triac Type classification and electrical characteristics within specified tolerances.

Functional Equivalent (Standard or Sensitive Gate Type): MAC12MG, BT138-600-0Q, BT138-600-0TQ, BT138-600/DG,127, BT138-600E,127, BTA212-600F,127, BTA312-600C,127, BTA312-600CT,127, and BTA410-600CT,127 meet or exceed the primary electrical and mechanical requirements despite differing Triac Type classifications. These parts support higher on-state current ratings (10A to 12A) and maintain 600V voltage rating with compatible gate trigger specifications.

Parameter Comparison

Parameter	Q6008RH4	BTA08-600CWRG	MAC12MG	BT138-600-0Q	BT138-600-0TQ	BT138-600/DG,127	BT138-600E,127	BTA212-600F,127	BTA312-600C,127	BTA312-600CT,127	BTA410-600CT,127
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	12 A	12 A	12 A	12 A	12 A	12 A	12 A	12 A	10 A
Triac Type	Alternistor - Snubberless	Alternistor - Snubberless	Standard	Standard	Standard	Standard	Logic - Sensitive Gate	Standard	Standard	Standard	Standard
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.5 V	1 V	1 V	1.5 V	1.5 V	1.5 V	1.5 V	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	35 mA	35 mA	35 mA	35 mA	35 mA	35 mA	10 mA	25 mA	35 mA	35 mA	35 mA
Current - Hold (Ih) (Max)	35 mA	35 mA	40 mA	30 mA	30 mA	30 mA	30 mA	30 mA	35 mA	35 mA	35 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	125°C (TJ)	125°C (TJ)	125°C (TJ)	125°C (TJ)	125°C (TJ)	125°C (TJ)	150°C (TJ)	125°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	Not specified	Not specified	ROHS3 Compliant	Not specified	RoHS Compliant	RoHS Compliant	RoHS Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Preferred): BTA08-600CWRG (STMicroelectronics) is the optimal substitute. It maintains identical Triac Type (Alternistor - Snubberless), matching voltage and current ratings, gate trigger specifications, and operating temperature range. ROHS3 compliance and active product status ensure long-term availability and supply chain continuity.

Functional Equivalents (Higher Current Rating): MAC12MG (Littelfuse Inc.), BT138-600-0Q, BT138-600-0TQ, BT138-600/DG,127, and BT138-600E,127 are suitable for applications where 8A on-state current is adequate but higher surge capacity is beneficial. These parts support 12A on-state current while maintaining 600V voltage rating and compatible gate trigger parameters. All are in active production status.

Extended Temperature Operation: BTA312-600CT,127 (WeEn Semiconductors) supports 150°C junction temperature, exceeding the Q6008RH4 specification of 125°C. This part is applicable for thermal-constrained applications requiring enhanced temperature margin.

Reduced Gate Trigger Current: BT138-600E,127 (WeEn Semiconductors) features 10 mA gate trigger current, lower than the Q6008RH4 specification of 35 mA. This characteristic reduces gate drive circuit power requirements in sensitive-gate applications.

All recommended substitutes maintain TO-220-3 through-hole packaging, 600V off-state voltage, and RoHS compliance status suitable for direct PCB integration.

Frequently Asked Questions (FAQ)

Q: Can BTA08-600CWRG directly replace Q6008RH4 without circuit modification? A: Yes. BTA08-600CWRG maintains identical electrical specifications including 600V voltage rating, 8A on-state current, 1.3V gate trigger voltage, and 35 mA gate trigger current. Both components use TO-220-3 through-hole packaging. No circuit redesign is required.

Q: Why are 12A-rated parts listed as substitutes for an 8A component? A: Higher current-rated parts (MAC12MG, BT138 series, BTA212, BTA312) meet or exceed all electrical requirements of the Q6008RH4. The 12A rating provides additional design margin and surge capacity while maintaining compatibility with 8A circuit operation. These parts are functionally equivalent when on-state current demand does not exceed 8A.

Q: What is the difference between Alternistor and Standard TRIAC types? A: Alternistor (snubberless) TRIACs incorporate internal snubber networks to suppress parasitic switching transients, reducing external component requirements. Standard TRIACs may require external snubber circuits in certain applications. Both types are electrically compatible when gate trigger and current specifications align. Application circuit design determines whether snubberless characteristics are necessary.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitute parts use TO-220-3 through-hole packaging, matching the Q6008RH4 footprint and mounting requirements. Supplier device package designations (TO-220AB, TO-220) refer to tab isolation variants within the TO-220-3 family and do not affect PCB compatibility.

Q: Which substitute part has the lowest gate trigger current requirement? A: BT138-600E,127 specifies 10 mA maximum gate trigger current, compared to 35 mA for the Q6008RH4. This reduced requirement decreases gate drive circuit power dissipation and is applicable for logic-level gate drive implementations.

Q: Do all substitutes maintain ROHS3 compliance? A: BTA08-600CWRG, MAC12MG, and BT138-600E,127 explicitly specify ROHS3 compliance. BTA212-600F,127, BTA312-600C,127, BTA312-600CT,127, and BTA410-600CT,127 specify RoHS compliance. BT138-600-0Q and BT138-600-0TQ do not specify compliance status in provided documentation.

Q: Can BTA410-600CT,127 substitute for Q6008RH4 despite 10A rating? A: Yes. BTA410-600CT,127 maintains 600V voltage rating, 1.5V gate trigger voltage, and 35 mA gate trigger current specifications. The 10A on-state current rating exceeds the Q6008RH4 requirement of 8A, providing operational margin. This part is suitable for direct substitution in 8A applications.

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