Q8016RH3 TRIAC Alternistor 800V 16A TO-220 Equivalent & Substitute Parts

Part Overview

The Q8016RH3 is a TRIAC Alternistor (Snubberless) rated for 800V off-state voltage and 16A on-state current in a Through Hole TO-220 package manufactured by Littelfuse Inc. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The Alternistor topology provides snubberless operation, reducing external component requirements in AC switching applications.

Key Parameters

Parameter	Q8016RH3
Manufacturer	Littelfuse Inc.
Category	Thyristors - TRIAC
Triac Type	Alternistor - Snubberless
Voltage - Off State	800 V
Current - On State (It RMS Max)	16 A
Voltage - Gate Trigger (Vgt Max)	1.3 V
Current - Gate Trigger (Igt Max)	20 mA
Current - Hold (Ih Max)	35 mA
Current - Non Rep. Surge (50/60Hz)	167A / 200A
Operating Temperature Range	-40°C to 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the Q8016RH3 is determined by the following critical parameters:

Voltage Rating (Off State): Must be 800V minimum to maintain voltage margin
Current Rating (On State): Must support 16A RMS or higher for direct replacement; lower ratings require circuit redesign
Triac Type: Alternistor - Snubberless topology preferred for functional equivalence; Standard or Logic - Sensitive Gate types represent functional alternatives with different gate characteristics
Gate Trigger Parameters: Vgt and Igt determine gate drive circuit compatibility
Package / Case: TO-220-3 form factor required for mechanical and thermal compatibility
Operating Temperature: -40°C to 125°C range required for thermal envelope compatibility
RoHS Compliance: ROHS3 compliance required for regulatory alignment

Substitute parts are grouped into three categories based on triac type and current rating:

Direct Alternistor Equivalents (16A, Snubberless): BTB16-800BWRG, BTB16-800CWRG
Alternistor Lower Current (8A-12A, Snubberless): BTB08-800CWRG, BTB12-800CWRG
Standard and Sensitive Gate Types (6A-20A): ACST610-8T, ACST830-8T, BTA420-800CT,127, BTB08-800TWRG, BTB16-800BRG, BTB16-800SWRG

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage (V)	Current (A)	Vgt Max (V)	Igt Max (mA)	Ih Max (mA)	Itsm 50/60Hz (A)	Temp Range (°C)	Product Status
Q8016RH3	Littelfuse Inc.	Alternistor - Snubberless	800	16	1.3	20	35	167 / 200	-40 to 125	Discontinued
BTB16-800BWRG	STMicroelectronics	Alternistor - Snubberless	800	16	1.3	50	50	160 / 168	-40 to 125	Active
BTB16-800CWRG	STMicroelectronics	Alternistor - Snubberless	800	16	1.3	35	35	160 / 168	-40 to 125	Active
BTB12-800CWRG	STMicroelectronics	Alternistor - Snubberless	800	12	1.3	35	35	120 / 126	-40 to 125	Active
BTB08-800CWRG	STMicroelectronics	Alternistor - Snubberless	800	8	1.2	35	35	80 / 84	-40 to 125	Active
BTB16-800BRG	STMicroelectronics	Standard	800	16	1.3	50	50	160 / 168	-40 to 125	Active
BTB16-800SWRG	STMicroelectronics	Logic - Sensitive Gate	800	16	1.3	10	15	160 / 168	-40 to 125	Active
BTA420-800CT,127	WeEn Semiconductors	Standard	800	20	1	35	40	200 / 220	-40 to 150	Active
ACST830-8T	STMicroelectronics	Standard	800	8	1	30	30	80 / 84	-40 to 125	Active
ACST610-8T	STMicroelectronics	Logic - Sensitive Gate	800	6	1	10	25	45 / 47	-40 to 125	Active
BTB08-800TWRG	STMicroelectronics	Logic - Sensitive Gate	800	8	1.3	5	10	80 / 84	-40 to 125	Active

Engineering Selection Recommendations

Direct Replacement (Alternistor 16A): BTB16-800CWRG is the primary substitute. It maintains Alternistor topology, 16A current rating, 800V voltage rating, and identical operating temperature range. Gate trigger parameters (Vgt 1.3V, Igt 35mA) match the original specification. Product status is Active with high inventory availability (55,100 pcs). ROHS3 compliance and REACH Unaffected status align with regulatory requirements.

BTB16-800BWRG provides an alternative with identical electrical ratings but higher gate trigger current (Igt 50mA), requiring gate drive circuit verification.

Alternative with Higher Current Rating: BTA420-800CT,127 (20A, Standard type) supports higher current margin and extended operating temperature to 150°C. Lower gate trigger voltage (Vgt 1V) may require gate drive circuit adjustment. Product status is Active. Use when thermal headroom or current margin is required.

Lower Current Alternistor Options: BTB12-800CWRG (12A) and BTB08-800CWRG (8A) maintain Alternistor topology for applications with reduced current requirements. Both are Active products with ROHS3 compliance.

Sensitive Gate Alternatives: BTB16-800SWRG (16A, Logic - Sensitive Gate) and ACST610-8T (6A, Logic - Sensitive Gate) feature lower gate trigger current (Igt 5-10mA), reducing gate drive power requirements. These require gate drive circuit redesign but maintain voltage and temperature specifications.

All recommended substitutes are Active products with ROHS3 compliance and adequate inventory availability.

Frequently Asked Questions (FAQ)

Q: Can BTB16-800CWRG directly replace Q8016RH3 without circuit modification?

A: BTB16-800CWRG is a direct electrical substitute. Both are 800V, 16A Alternistor devices in TO-220-3 packages with matching operating temperature ranges. Gate trigger parameters (Vgt 1.3V, Igt 35mA) are identical. Mechanical and thermal compatibility is confirmed. No circuit modification is required.

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

A: Alternistor (Snubberless) devices integrate internal snubber networks, eliminating external RC snubber components. Standard TRIACs require external snubber circuits for EMI suppression. Alternistor topology reduces component count and PCB area. Standard types offer lower gate trigger voltage in some cases.

Q: Can I use BTA420-800CT,127 (20A) instead of Q8016RH3 (16A)?

A: BTA420-800CT,127 is electrically compatible with higher current margin (20A vs 16A). However, it is a Standard type rather than Alternistor, requiring external snubber circuit design. Operating temperature extends to 150°C. Gate trigger voltage is lower (1V vs 1.3V), requiring gate drive circuit verification. Use only if circuit design accommodates these differences.

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

A: Logic - Sensitive Gate types (BTB16-800SWRG, ACST610-8T) feature lower Igt (5-10mA vs 20-35mA), reducing gate drive power consumption. These require gate drive circuits optimized for lower current. Standard and Alternistor types require higher gate drive current but tolerate wider gate drive circuit variations.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes are ROHS3 compliant. Compliance status is verified in the parameter comparison table. Regulatory alignment with the original Q8016RH3 is maintained across all active product alternatives.

Q: What inventory considerations apply to these substitutes?

A: BTB16-800CWRG has the highest inventory (55,100 pcs), followed by BTB16-800BWRG (25,200 pcs). All recommended substitutes are Active products with adequate stock levels. Discontinued status applies only to the original Q8016RH3.

Q: Can I use ACST610-8T (6A) in a 16A application?

A: ACST610-8T is rated for 6A maximum on-state current, insufficient for 16A applications. Use only in circuits designed for 6A or lower current. This part is suitable for lower-power AC switching applications requiring sensitive gate characteristics.

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