TIC108M-S SCR 600V 5A TO-220 Equivalent & Substitute Parts

Part Overview

The TIC108M-S is a standard recovery silicon controlled rectifier (SCR) rated for 600V off-state voltage and 5A RMS on-state current in a through-hole TO-220-3 package. Manufactured by Bourns Inc., this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is necessary for design continuity, maintenance, and new production applications requiring comparable electrical and mechanical characteristics.

Key Parameters

Parameter	Value
Voltage - Off State	600 V
Current - On State (It RMS)	5 A
Voltage - On State (Vtm) Max	1.7 V
SCR Type	Standard Recovery
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature Range	-40°C to 110°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TIC108M-S is determined by the following criteria:

Voltage Rating: Off-state voltage must be 600V or greater
Current Rating: On-state RMS current must meet or exceed 5A
Package: TO-220-3 through-hole configuration required for mechanical compatibility
SCR Type: Standard recovery or sensitive gate types acceptable
Temperature Range: Operating range must encompass or exceed -40°C to 110°C
Compliance: ROHS3 compliance required

The substitute parts identified below meet these electrical and mechanical requirements while maintaining functional equivalence for circuit applications.

Parameter Comparison

Parameter	TIC108M-S	TS420-600T	TS820-600T	TYN608RG	TYN612RG	TYN612TRG
Manufacturer	Bourns Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Voltage - Off State	600 V	600 V	600 V	600 V	600 V	600 V
Current - On State (It RMS)	5 A	4 A	8 A	8 A	12 A	12 A
Voltage - On State (Vtm) Max	1.7 V	1.6 V	1.6 V	1.6 V	1.6 V	1.6 V
SCR Type	Standard Recovery	Sensitive Gate	Sensitive Gate	Standard Recovery	Standard Recovery	Standard Recovery
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature Range	-40°C to 110°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

TYN612RG and TYN612TRG are the preferred substitutes. Both are active products from STMicroelectronics with 12A RMS current ratings, exceeding the TIC108M-S 5A requirement. Both maintain standard recovery SCR type, 600V voltage rating, TO-220-3 package compatibility, and extended operating temperature range to 125°C. TYN612TRG features reduced gate trigger current (5 mA maximum) compared to TYN612RG (15 mA maximum), offering improved gate sensitivity. Both are ROHS3 compliant with unlimited moisture sensitivity level.

TYN608RG is an alternative active product with 8A RMS current rating, also standard recovery type, meeting all electrical and mechanical requirements with the same compliance certifications.

Secondary Substitute (Sensitive Gate Type)

TS420-600T is an active STMicroelectronics product with sensitive gate characteristics. Its 4A RMS rating is below the TIC108M-S 5A specification and should be evaluated only for applications where the lower current rating is acceptable. The sensitive gate type reduces gate trigger requirements (800 mV, 200 µA) compared to standard recovery types.

Avoid

TS820-600T, though electrically compatible with 8A RMS rating and standard recovery type, carries obsolete product status and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can TS420-600T substitute for TIC108M-S despite its 4A RMS rating?

A: TS420-600T has a 4A RMS current rating, which is below the TIC108M-S 5A specification. Substitution is not recommended unless the application circuit operates at currents below 4A RMS. Verify actual circuit current requirements before selection.

Q: What is the difference between standard recovery and sensitive gate SCR types?

A: Standard recovery SCRs (TYN608RG, TYN612RG, TYN612TRG) require higher gate trigger voltage and current. Sensitive gate SCRs (TS420-600T, TS820-600T) require lower gate trigger levels, reducing gate drive circuit complexity. Both types are electrically compatible in 600V applications but differ in gate control requirements.

Q: Are all substitute parts pin-compatible with TIC108M-S?

A: All substitute parts use TO-220-3 package configuration with identical pin assignments (Gate, Cathode, Anode). Direct mechanical and electrical substitution is possible without circuit board modification.

Q: Why do some substitutes have higher current ratings than the TIC108M-S?

A: Higher-rated devices (8A, 12A) provide design margin and thermal headroom in applications. They are electrically compatible and can be used in circuits designed for 5A operation. Thermal management and PCB layout should be verified for the specific application.

Q: Is the extended temperature range of substitute parts (-40°C to 125°C vs. -40°C to 110°C) significant?

A: The extended range provides additional operational margin. For applications operating within -40°C to 110°C, all substitute parts are fully compatible. Applications requiring operation above 110°C benefit from the extended range of active substitutes.

Q: Which substitute offers the best gate sensitivity?

A: TYN612TRG provides the lowest gate trigger current specification (5 mA maximum) among standard recovery types, offering improved gate sensitivity compared to TYN612RG (15 mA) and TYN608RG (15 mA).

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