TIC108D-S Equivalent & Substitute Parts

Part Overview

The TIC108D-S is a standard recovery SCR (silicon-controlled rectifier) rated for 400V off-state voltage and 5A RMS on-state current in a TO-220-3 through-hole package, manufactured by Bourns Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The TIC108D-S serves as a general-purpose thyristor for AC switching and control applications requiring moderate voltage and current ratings.

Substiute Parts

TIC108D-S

Bourns Inc.In Stock: 1049TIC108D-S Datasheet

Current PartRFQ

TN22-1500T

STMicroelectronicsIn Stock: 2112TN22-1500T Datasheet

SimilarRFQ

TS420-600T

STMicroelectronicsIn Stock: 2704TS420-600T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TIC108D-S is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Voltage - Off State: Must equal or exceed 400V
• Package / Case: Must be TO-220-3 through-hole configuration
• SCR Type: Standard Recovery operation required
• Mounting Type: Through Hole

Functional Compatibility Criteria:

• Current - On State (It RMS): Must support minimum 5A RMS rating
• Voltage - On State (Vtm Max): Should not significantly exceed 1.7V to maintain circuit performance
• Gate trigger characteristics (Vgt, Igt): Must be compatible with existing gate drive circuitry

The two substitute parts identified meet the mandatory criteria with the following considerations:

TN22-1500T (STMicroelectronics): Matches 400V off-state voltage and TO-220-3 package. Current rating is 2A RMS, which is below the TIC108D-S specification. Suitable only for applications where reduced current capacity is acceptable.

TS420-600T (STMicroelectronics): Exceeds voltage rating at 600V off-state and provides 4A RMS current capacity. Classified as Sensitive Gate type rather than Standard Recovery. Suitable for applications requiring higher voltage margin or where gate sensitivity is beneficial.

Parameter Comparison

Engineering Selection Recommendations

TN22-1500T Selection: This part maintains identical voltage rating and standard recovery characteristics as the TIC108D-S. However, the 2A RMS current rating represents a 60% reduction from the original specification. Selection is appropriate only for applications where circuit load current does not exceed 2A RMS. The higher on-state voltage (3.1V vs 1.7V) and elevated hold current (175mA vs 10mA) indicate different internal characteristics that may affect circuit behavior. Both parts share obsolete product status, limiting long-term procurement viability.

TS420-600T Selection: This part is the preferred substitute from a product lifecycle perspective, as it maintains active status with ongoing manufacturer support. The 600V off-state rating provides 50% voltage margin above the original 400V specification, suitable for applications with voltage transient concerns. The 4A RMS current rating approaches the original 5A specification more closely than TN22-1500T. The Sensitive Gate classification indicates lower gate trigger requirements (0.8V, 0.2mA), which may require gate drive circuit adjustment. The extended operating temperature range (-40 to 125°C) provides additional thermal margin. All parts maintain ROHS3 compliance and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can TN22-1500T directly replace TIC108D-S in all applications?

A: No. TN22-1500T is rated for 2A RMS maximum on-state current, compared to the TIC108D-S specification of 5A RMS. Direct substitution is limited to applications where actual circuit current does not exceed 2A RMS. Additionally, the higher on-state voltage drop (3.1V vs 1.7V) will increase power dissipation and heat generation.

Q: What are the implications of using TS420-600T instead of TIC108D-S?

A: TS420-600T provides higher voltage rating (600V vs 400V), which is beneficial for transient protection but not required for nominal 400V operation. The Sensitive Gate classification means lower gate trigger voltage and current are required, necessitating verification that existing gate drive circuitry can operate at these reduced levels. The 4A RMS rating is slightly below the original 5A specification. TS420-600T is the only active-status option, ensuring long-term availability.

Q: Are all substitute parts compatible with the TO-220-3 package footprint?

A: Yes. All three parts use TO-220-3 through-hole packaging with identical pin configuration and mechanical dimensions, allowing direct PCB footprint compatibility without layout modification.

Q: What is the significance of Standard Recovery versus Sensitive Gate classification?

A: Standard Recovery SCRs (TIC108D-S, TN22-1500T) require higher gate trigger voltage and current for reliable turn-on. Sensitive Gate SCRs (TS420-600T) achieve turn-on with lower gate drive requirements, reducing gate circuit complexity but potentially increasing sensitivity to noise. Circuit gate drive design must be verified for compatibility with the selected part type.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All three parts are ROHS3 compliant and classified as EAR99 for export purposes. Moisture sensitivity level is 1 (Unlimited) for TIC108D-S and TS420-600T, indicating no special moisture handling requirements during storage or assembly.