TIC226D-S TRIAC Equivalent & Substitute Parts

Part Overview

The TIC226D-S is a standard TRIAC manufactured by Bourns Inc., rated for 400V off-state voltage and 8A on-state current in a TO-220 through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The TIC226D-S serves as a general-purpose thyristor for AC switching applications requiring moderate current handling and voltage isolation.

Key Parameters

Parameter	Value
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)	50 mA
Current - Hold (Ih) (Max)	30 mA
Operating Temperature Range	-40°C ~ 110°C (TC)
Mounting Type	Through Hole
Package / Case	TO-220-3
Configuration	Single
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TIC226D-S is determined by the following critical parameters:

Voltage - Off State: 400 V (exact match required)
Package / Case: TO-220-3 (mechanical and thermal compatibility)
Configuration: Single (functional equivalence)
Mounting Type: Through Hole (board-level compatibility)
RoHS Status: ROHS3 Compliant (regulatory alignment)

The Q4006RH3TP qualifies as a substitute based on matching off-state voltage (400 V), package type (TO-220-3), single configuration, through-hole mounting, and ROHS3 compliance. Differences in on-state current rating, gate trigger characteristics, and triac type (Alternistor vs. Standard) are secondary considerations that do not preclude substitution in applications where the substitute's electrical characteristics remain within acceptable operating margins.

Parameter Comparison

Parameter	TIC226D-S (Bourns)	Q4006RH3TP (Littelfuse)
Manufacturer	Bourns Inc.	Littelfuse Inc.
Voltage - Off State	400 V	400 V
Current - On State (It (RMS)) (Max)	8 A	6 A
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.3 V
Current - Gate Trigger (Igt) (Max)	50 mA	10 mA
Current - Hold (Ih) (Max)	30 mA	15 mA
Triac Type	Standard	Alternistor - Snubberless
Operating Temperature Range	-40°C ~ 110°C (TC)	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The Q4006RH3TP is an active product from Littelfuse Inc. and represents a viable substitute for the obsolete TIC226D-S. Both components meet ROHS3 compliance requirements and share identical off-state voltage ratings and TO-220-3 packaging. The Q4006RH3TP offers an extended operating temperature range (-40°C ~ 125°C) compared to the TIC226D-S (-40°C ~ 110°C), providing additional thermal margin in high-temperature environments.

The primary design consideration is the reduced on-state current rating of the Q4006RH3TP (6 A versus 8 A). Applications requiring the full 8 A capability of the TIC226D-S must evaluate whether the 6 A rating of the substitute is sufficient for the intended load. The Q4006RH3TP's lower gate trigger voltage (1.3 V) and current (10 mA) may improve gate drive efficiency in certain circuit topologies.

Selection should be based on application current requirements, thermal constraints, and gate drive circuit compatibility.

Frequently Asked Questions (FAQ)

Q: Can the Q4006RH3TP directly replace the TIC226D-S in existing designs?

A: Direct replacement is possible if the application current requirement does not exceed 6 A. The identical off-state voltage (400 V) and TO-220-3 package ensure mechanical and electrical compatibility at the board level. Gate drive circuits may require adjustment due to differences in trigger voltage and current specifications.

Q: What is the significance of the Alternistor designation on the Q4006RH3TP?

A: The Alternistor designation indicates a snubberless TRIAC design. This affects the device's switching characteristics and EMI performance but does not preclude substitution in applications where the electrical parameters remain within acceptable limits.

Q: Are there thermal considerations when substituting the Q4006RH3TP for the TIC226D-S?

A: The Q4006RH3TP supports a higher maximum junction temperature (125°C versus 110°C), providing additional thermal headroom. However, the reduced on-state current rating (6 A) may result in lower power dissipation in current-limited applications, potentially improving thermal performance.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the TIC226D-S and Q4006RH3TP are ROHS3 compliant and REACH unaffected, ensuring compatibility with current regulatory requirements for electronic components.

Q: What packaging format is the Q4006RH3TP supplied in?

A: The Q4006RH3TP is supplied in tube packaging, consistent with standard through-hole component distribution for TO-220 devices.

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