Q8016RH4TP TRIAC Alternistor 800V 16A Equivalent & Substitute Parts

Part Overview

The Q8016RH4TP is an 800V 16A TRIAC Alternistor (Snubberless) manufactured by Littelfuse Inc. in TO-220 Non-Isolated Tab packaging. This component is classified as Active status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and functional characteristics within the thyristor category. Substitutes are necessary when the primary part is unavailable, when supply chain optimization is required, or when design flexibility permits selection from qualified alternatives meeting the same performance envelope.

Key Parameters

Parameter	Q8016RH4TP
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)	35 mA
Current - Hold (Ih) (Max)	50 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	167A, 200A
Triac Type	Alternistor - Snubberless
Package / Case	TO-220-3
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic is based on the following criteria:

Primary Matching Criteria:

Voltage - Off State: 800 V (exact match required)
Current - On State (It (RMS)) (Max): 16 A minimum
Package / Case: TO-220-3 (mechanical compatibility)
Mounting Type: Through Hole
Configuration: Single

Secondary Compatibility Factors:

Voltage - Gate Trigger (Vgt) (Max): ≤ 1.5 V
Current - Gate Trigger (Igt) (Max): ≤ 50 mA
Current - Hold (Ih) (Max): ≤ 60 mA
Operating Temperature: -40°C minimum to 125°C minimum
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (16A Rating): Parts matching 800V, 16A specifications with compatible gate trigger characteristics. These include both Standard TRIAC and Alternistor - Snubberless types from WeEn Semiconductors and STMicroelectronics.

Category B - Higher Current Capacity Alternatives (20A-25A Rating): Parts rated for 800V with current ratings of 20A or 25A, providing design margin and extended operational capability while maintaining TO-220-3 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage - Off State	Current - On State (It (RMS)) (Max)	Voltage - Gate Trigger (Vgt) (Max)	Current - Gate Trigger (Igt) (Max)	Current - Hold (Ih) (Max)	Operating Temperature	Package / Case	RoHS Status
Q8016RH4TP	Littelfuse Inc.	Alternistor - Snubberless	800 V	16 A	1.3 V	35 mA	50 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BT139-800,127	WeEn Semiconductors	Standard	800 V	16 A	1.5 V	35 mA	45 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BT139-800E,127	WeEn Semiconductors	Logic - Sensitive Gate	800 V	16 A	1.5 V	10 mA	45 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTA140-800,127	WeEn Semiconductors	Standard	800 V	25 A	1.5 V	35 mA	60 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTA225-800B,127	WeEn Semiconductors	Standard	800 V	25 A	1.5 V	50 mA	60 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTA420-800BT,127	WeEn Semiconductors	Standard	800 V	20 A	1 V	50 mA	60 mA	-40°C ~ 150°C	TO-220-3	ROHS3 Compliant
BTB08-800TWRG	STMicroelectronics	Logic - Sensitive Gate	800 V	8 A	1.3 V	5 mA	10 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTB10-800BWRG	STMicroelectronics	Alternistor - Snubberless	800 V	10 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTB16-800BRG	STMicroelectronics	Standard	800 V	16 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTB16-800BWRG	STMicroelectronics	Alternistor - Snubberless	800 V	16 A	1.3 V	50 mA	50 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant
BTB16-800CWRG	STMicroelectronics	Alternistor - Snubberless	800 V	16 A	1.3 V	35 mA	35 mA	-40°C ~ 125°C	TO-220-3	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Preferred for 1:1 Replacement):

BTB16-800BWRG and BTB16-800CWRG from STMicroelectronics are Alternistor - Snubberless types matching the Q8016RH4TP functional classification. Both maintain 800V, 16A ratings, TO-220-3 packaging, and -40°C to 125°C operating range. BTB16-800CWRG provides tighter gate trigger current specification (35 mA) matching the original part more closely. Both are ROHS3 compliant and REACH Unaffected.

Standard TRIAC Alternatives (16A Class):

BT139-800,127 from WeEn Semiconductors is a Standard TRIAC rated 800V, 16A with identical gate trigger current (35 mA) and hold current (45 mA) compatibility. BT139-800E,127 offers Logic - Sensitive Gate characteristics with reduced gate trigger current (10 mA), suitable for low-power gate drive circuits. Both maintain ROHS3 compliance and -40°C to 125°C operating temperature.

BTB16-800BRG from STMicroelectronics is a Standard TRIAC with 800V, 16A rating and matching thermal range, providing an alternative to Alternistor technology while maintaining electrical compatibility.

Higher Current Capacity Options (20A-25A Class):

BTA420-800BT,127 provides 800V, 20A capability with extended operating temperature to 150°C and lower gate trigger voltage (1 V), offering thermal margin and improved gate sensitivity. BTA140-800,127 and BTA225-800B,127 both provide 800V, 25A ratings with design margin above the 16A requirement. These are suitable when circuit design permits higher current handling or when thermal derating is a consideration.

All recommended substitutes are Active status products with ROHS3 compliance and standard HTSUS classification 8541.30.0080.

Frequently Asked Questions (FAQ)

Q: Can BTB16-800BWRG directly replace Q8016RH4TP in existing designs?

A: Yes. Both are Alternistor - Snubberless types with identical 800V, 16A ratings, TO-220-3 packaging, and -40°C to 125°C operating temperature. Gate trigger specifications are compatible (1.3 V maximum, 50 mA maximum). No circuit modifications are required.

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

A: Alternistor - Snubberless TRIACs (Q8016RH4TP, BTB16-800BWRG, BTB16-800CWRG) are optimized for reduced EMI and do not require external snubber networks. Standard TRIACs (BT139-800,127, BTB16-800BRG) may require snubber circuits in certain applications. Both types meet the same voltage and current ratings specified.

Q: Can I use a 25A rated TRIAC (BTA140-800,127 or BTA225-800B,127) instead of the 16A Q8016RH4TP?

A: Yes, from an electrical standpoint. Higher current ratings provide design margin and thermal headroom. All parameters remain within acceptable ranges for 800V operation. Verify that PCB thermal design and heatsinking accommodate the component without exceeding junction temperature limits.

Q: What is the significance of gate trigger voltage (Vgt) differences between parts?

A: Gate trigger voltage determines the minimum gate voltage required to turn on the TRIAC. Q8016RH4TP specifies 1.3 V maximum. Substitutes with 1.5 V maximum (BT139-800,127, BTA140-800,127, BTA225-800B,127) require slightly higher gate drive voltage but remain compatible with standard gate drive circuits. BTA420-800BT,127 with 1 V maximum offers improved gate sensitivity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH Unaffected, matching the compliance status of Q8016RH4TP.

Q: What does "Logic - Sensitive Gate" mean in BT139-800E,127?

A: Logic - Sensitive Gate TRIACs have reduced gate trigger current (10 mA for BT139-800E,127 versus 35 mA for standard types). This classification indicates compatibility with low-power logic-level gate drive circuits, reducing gate drive component requirements.

Q: Can I use BTB08-800TWRG as a substitute?

A: No. BTB08-800TWRG is rated for 8A maximum on-state current, below the 16A requirement of Q8016RH4TP. This part is undersized for equivalent operation and would not meet circuit current demands.

Q: What is the difference between TO-220 and TO-220AB packaging designations?

A: Both are TO-220-3 case styles suitable for through-hole mounting. TO-220AB and TO-220 Non-Isolated Tab are mechanically and electrically compatible for PCB footprint and thermal interface purposes. Supplier device package designations reflect manufacturer conventions but do not affect substitution compatibility.

Q: Should I verify gate drive circuit compatibility when substituting?

A: Confirm that existing gate drive voltage and current capabilities remain within the specifications of the selected substitute. Compare Voltage - Gate Trigger (Vgt) (Max) and Current - Gate Trigger (Igt) (Max) values. Most standard gate drive circuits accommodate the specified ranges across all listed substitutes.

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