TIC225D-S Equivalent & Substitute Parts

Part Overview

The TIC225D-S is a Logic - Sensitive Gate TRIAC manufactured by Bourns Inc., rated for 400 V off-state voltage and 8 A on-state current in a Through Hole TO-220 package. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

Parameter	TIC225D-S
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	2 V
Current - Gate Trigger (Igt) (Max)	5 mA
Current - Hold (Ih) (Max)	20 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	70 A @ 50Hz
Operating Temperature Range	-40°C ~ 110°C (TC)
Package / Case	TO-220-3
Mounting Type	Through Hole
Configuration	Single

Substitute Part Grouping Explanation

Substitution eligibility for the TIC225D-S is determined by the following criteria:

Primary Compatibility Parameters:

Voltage - Off State: Must be equal to or greater than 400 V
Current - On State (It (RMS)): Must be equal to or greater than 8 A
Package / Case: Must be TO-220-3
Mounting Type: Must be Through Hole
Configuration: Must be Single

Secondary Compatibility Parameters:

Voltage - Gate Trigger (Vgt): Lower values indicate easier gate triggering; values at or below 2 V are compatible
Current - Gate Trigger (Igt): Values at or below 5 mA are compatible
Current - Hold (Ih): Values at or below 20 mA are compatible
Operating Temperature Range: Must support the application's thermal requirements

The three substitute parts listed meet the primary compatibility criteria with variations in secondary parameters that do not prevent functional substitution in applications designed for the TIC225D-S.

Parameter Comparison

Parameter	TIC225D-S (Bourns)	MAC8SDG (onsemi)	Q4006RH3TP (Littelfuse)	BTB08-600SWRG (STMicroelectronics)
Voltage - Off State	400 V	400 V	400 V	600 V
Current - On State (It (RMS)) (Max)	8 A	8 A	6 A	8 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.5 V	1.3 V	1.3 V
Current - Gate Trigger (Igt) (Max)	5 mA	5 mA	10 mA	10 mA
Current - Hold (Ih) (Max)	20 mA	10 mA	15 mA	15 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	70 A @ 50Hz	70 A @ 60Hz	80 A, 85 A	80 A, 84 A
Operating Temperature Range	-40°C ~ 110°C (TC)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Alternistor - Snubberless	Logic - Sensitive Gate
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAC8SDG (onsemi): This part is the closest functional equivalent to the TIC225D-S. It maintains identical voltage and current ratings, operates across an extended temperature range (-40°C ~ 125°C), and is ROHS3 compliant. The part is in Active product status with 2144 units in stock. The gate trigger voltage is lower (1.5 V vs. 2 V), which represents improved gate sensitivity. This part is suitable for direct substitution in applications where the TIC225D-S was originally specified.

BTB08-600SWRG (STMicroelectronics): This part provides higher off-state voltage (600 V vs. 400 V), making it suitable for applications requiring enhanced voltage margin. It maintains the 8 A on-state current rating and is ROHS3 compliant. The part is in Active product status with 10399 units in stock. The higher voltage rating introduces no functional incompatibility for 400 V applications. REACH Unaffected status is documented.

Q4006RH3TP (Littelfuse): This part differs in on-state current rating (6 A vs. 8 A) and triac type classification (Alternistor - Snubberless vs. Logic - Sensitive Gate). It is suitable only for applications where the 6 A current rating is sufficient. The part is in Active product status with 1027 units in stock and is ROHS3 compliant. REACH Unaffected status is documented.

Frequently Asked Questions (FAQ)

Q: Can MAC8SDG replace TIC225D-S in all applications? A: MAC8SDG meets all primary compatibility criteria: 400 V off-state voltage, 8 A on-state current, TO-220-3 package, and Through Hole mounting. The extended operating temperature range (-40°C ~ 125°C) provides additional thermal margin. Substitution is valid for applications designed for the TIC225D-S.

Q: Why is BTB08-600SWRG listed as a substitute if it has 600 V rating instead of 400 V? A: Higher off-state voltage does not prevent substitution in 400 V applications. A 600 V rated component operates safely at 400 V with increased voltage margin. This part is suitable when higher voltage headroom is beneficial or when 400 V rated alternatives are unavailable.

Q: Is Q4006RH3TP a suitable replacement for all TIC225D-S applications? A: Q4006RH3TP has a lower on-state current rating (6 A vs. 8 A). It is suitable only for applications where the load current does not exceed 6 A. The Alternistor - Snubberless classification differs from the Logic - Sensitive Gate type of the original part. Verify application current requirements before selection.

Q: What is the difference between Logic - Sensitive Gate and Alternistor - Snubberless TRIAC types? A: Logic - Sensitive Gate TRIACs are optimized for low gate trigger current and voltage, suitable for logic-level control circuits. Alternistor - Snubberless TRIACs are designed to operate without external snubber networks, providing improved EMI performance. Both types are single-configuration TRIACs in TO-220-3 packages.

Q: Are all substitute parts ROHS3 compliant? A: MAC8SDG, Q4006RH3TP, and BTB08-600SWRG are all ROHS3 compliant. The original TIC225D-S is also ROHS3 compliant. All parts have MSL 1 (Unlimited) moisture sensitivity level.

Q: What inventory availability should influence part selection? A: BTB08-600SWRG has the highest inventory (10399 units), followed by MAC8SDG (2144 units) and Q4006RH3TP (1027 units). Procurement lead time and supply chain continuity may favor the BTB08-600SWRG for high-volume applications.

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