Q8016RH4 TRIAC Equivalent & Substitute Parts

Part Overview

The Q8016RH4 is a Littelfuse Alternistor snubberless TRIAC rated for 800 V off-state voltage and 16 A on-state current in a TO-220 through-hole package. This part is discontinued at DiGi Electronics. Equivalent and substitute TRIACs are available from active manufacturers including WeEn Semiconductors and STMicroelectronics, offering comparable or enhanced electrical performance within the same package family and voltage class.

Key Parameters

Parameter	Q8016RH4
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)	167 A, 200 A
Triac Type	Alternistor - Snubberless
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 of the Q8016RH4 is determined by the following critical parameters:

Voltage Rating: All substitutes must maintain 800 V off-state voltage to ensure circuit protection and reliability
Current Rating: Substitutes rated at 16 A or higher on-state current are acceptable; lower ratings are not suitable
Package Type: TO-220-3 through-hole package is required for mechanical and thermal compatibility
Gate Trigger Characteristics: Vgt and Igt parameters determine gate drive requirements; substitutes with equal or lower trigger voltage and current are compatible
Operating Temperature Range: Minimum -40°C to 125°C required for thermal envelope compatibility
Triac Type: Alternistor snubberless types provide direct equivalence; standard and logic-gate variants offer functional alternatives with different gate characteristics

Substitutes are grouped into three categories: direct Alternistor equivalents, standard TRIAC alternatives with 16 A rating, and higher-current standard TRIACs (20–25 A) for applications requiring additional current margin.

Parameter Comparison

Part Number	Manufacturer	Triac Type	Voltage (V)	Current (A)	Vgt (Max)	Igt (Max)	Ih (Max)	Itsm (A/A)	Temp Range	Status
Q8016RH4	Littelfuse Inc.	Alternistor - Snubberless	800	16	1.3 V	35 mA	50 mA	167, 200	-40 to 125°C	Discontinued
BTB16-800BWRG	STMicroelectronics	Alternistor - Snubberless	800	16	1.3 V	50 mA	50 mA	160, 168	-40 to 125°C	Active
BTB16-800CWRG	STMicroelectronics	Alternistor - Snubberless	800	16	1.3 V	35 mA	35 mA	160, 168	-40 to 125°C	Active
BTB16-800BRG	STMicroelectronics	Standard	800	16	1.3 V	50 mA	50 mA	160, 168	-40 to 125°C	Active
BT139-800,127	WeEn Semiconductors	Standard	800	16	1.5 V	35 mA	45 mA	155, 170	-40 to 125°C	Active
BT139-800E,127	WeEn Semiconductors	Logic - Sensitive Gate	800	16	1.5 V	10 mA	45 mA	155, 170	-40 to 125°C	Active
BTA420-800BT,127	WeEn Semiconductors	Standard	800	20	1.0 V	50 mA	60 mA	200, 220	-40 to 150°C	Active
BTA140-800,127	WeEn Semiconductors	Standard	800	25	1.5 V	35 mA	60 mA	190, 209	-40 to 125°C	Active
BTA225-800B,127	WeEn Semiconductors	Standard	800	25	1.5 V	50 mA	60 mA	190, 209	-40 to 125°C	Active
BTB10-800BWRG	STMicroelectronics	Alternistor - Snubberless	800	10	1.3 V	50 mA	50 mA	100, 105	-40 to 125°C	Active
BTB08-800TWRG	STMicroelectronics	Logic - Sensitive Gate	800	8	1.3 V	5 mA	10 mA	80, 84	-40 to 125°C	Active

Engineering Selection Recommendations

Direct Alternistor Equivalents (Recommended Primary Substitutes)

BTB16-800CWRG and BTB16-800BWRG from STMicroelectronics are active Alternistor snubberless TRIACs with identical 800 V / 16 A ratings and matching gate trigger voltage of 1.3 V. Both are ROHS3 compliant and maintain the -40°C to 125°C operating range. BTB16-800CWRG provides the closest parameter match with Igt of 35 mA and Ih of 35 mA, matching the original specification. BTB16-800BWRG offers higher gate trigger current (50 mA) and hold current (50 mA) for applications requiring more robust gate drive. Both parts are in active production with substantial inventory availability.

Standard TRIAC 16 A Alternatives

BT139-800,127 and BTB16-800BRG are standard (non-snubberless) TRIACs rated 800 V / 16 A. These parts are functionally compatible but lack the snubberless Alternistor design of the original. BT139-800,127 from WeEn Semiconductors has slightly elevated gate trigger voltage (1.5 V) and reduced hold current (45 mA). BTB16-800BRG from STMicroelectronics maintains 1.3 V gate trigger voltage matching the original. Both are ROHS3 compliant and active.

Logic-Gate Sensitive Variants

BT139-800E,127 is a logic-gate sensitive variant with reduced gate trigger current (10 mA) suitable for low-power gate drive circuits. BTB08-800TWRG is a sensitive-gate TRIAC rated 8 A, suitable only for applications with reduced current requirements.

Higher Current Alternatives (20–25 A)

BTA420-800BT,127 (20 A) and BTA140-800,127 / BTA225-800B,127 (25 A) provide increased current capacity for applications requiring additional margin. BTA420-800BT,127 offers extended operating temperature to 150°C and lower gate trigger voltage (1.0 V). These parts are ROHS3 compliant and active but are not direct current equivalents.

Compliance and Availability

All recommended substitutes are ROHS3 compliant and in active production. STMicroelectronics Alternistor variants (BTB16-800BWRG, BTB16-800CWRG) offer the highest inventory levels (25,200 and 55,100 units respectively) and closest electrical equivalence to the discontinued Q8016RH4.

Frequently Asked Questions (FAQ)

Q: Can I use a standard TRIAC instead of an Alternistor snubberless TRIAC?

A: Standard TRIACs such as BT139-800,127 and BTB16-800BRG are functionally compatible in most applications. The Alternistor snubberless design reduces EMI and eliminates the need for external snubber networks in certain circuit topologies. If the original design included snubber components, standard TRIACs may be used without modification. If the design relied on snubberless operation, verify circuit performance with standard variants.

Q: What is the difference between Vgt and Igt specifications?

A: Vgt (Gate Trigger Voltage) is the maximum gate voltage required to trigger the TRIAC. Igt (Gate Trigger Current) is the maximum gate current required for triggering. Lower values indicate easier gate drive. The Q8016RH4 specifies Vgt of 1.3 V and Igt of 35 mA. Substitutes with equal or lower values are directly compatible; higher values may require gate drive circuit adjustment.

Q: Are all substitutes pin-compatible with the Q8016RH4?

A: Yes. All listed substitutes use the TO-220-3 through-hole package with identical pin configuration (Gate, MT1, MT2). Physical mounting and PCB layout are directly compatible.

Q: Can I use a 25 A TRIAC in place of a 16 A part?

A: Yes. Higher current-rated TRIACs such as BTA140-800,127 and BTA225-800B,127 are backward compatible in circuits designed for 16 A operation. The higher current rating provides additional thermal and electrical margin. Verify that gate drive circuits can supply the specified Igt current for reliable triggering.

Q: What is the difference between BTB16-800BWRG and BTB16-800CWRG?

A: Both are STMicroelectronics Alternistor snubberless TRIACs with identical voltage and current ratings. The primary difference is gate trigger current: BTB16-800BWRG specifies 50 mA maximum Igt and 50 mA maximum Ih, while BTB16-800CWRG specifies 35 mA maximum Igt and 35 mA maximum Ih. BTB16-800CWRG provides closer parameter matching to the Q8016RH4 (35 mA Igt).

Q: Is the BT139-800E,127 logic-gate variant suitable as a direct replacement?

A: BT139-800E,127 is a logic-gate sensitive variant with reduced gate trigger current (10 mA) designed for low-power gate drive circuits. It is electrically compatible but requires verification that the gate drive circuit can operate within the sensitive-gate specifications. Use only if the original design specified a sensitive-gate TRIAC or if gate drive power is severely limited.

Q: What inventory considerations should I evaluate?

A: STMicroelectronics Alternistor variants BTB16-800BWRG (25,200 units) and BTB16-800CWRG (55,100 units) offer the highest availability. WeEn Semiconductors BT139-800E,127 has 18,753 units in stock. All recommended substitutes are in active production with stable supply chains.

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