TFA107S Equivalent & Substitute Parts

Part Overview

The TFA107S is a silicon-controlled rectifier (SCR) manufactured by Sanken Electric USA Inc., rated for 700V off-state voltage with 15.7A RMS on-state current in a TO-220F through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The part operates across a temperature range of -40°C to 150°C and complies with RoHS standards.

Key Parameters

Parameter	Value
Voltage - Off State	700 V
Current - On State (It (RMS)) (Max)	15.7 A
Voltage - On State (Vtm) (Max)	1.35 V
Current - Gate Trigger (Igt) (Max)	15 mA
Voltage - Gate Trigger (Vgt) (Max)	1 V
Current - Hold (Ih) (Max)	20 mA
SCR Type	Standard Recovery
Package / Case	TO-220-3 Full Pack
Operating Temperature	-40°C ~ 150°C
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the TFA107S is determined by the following critical parameters:

Off-state voltage rating: Must equal or exceed 700V to maintain circuit protection margins
On-state current (RMS): Must support minimum 15.7A RMS operation
Gate trigger characteristics: Vgt and Igt must be compatible with existing gate drive circuitry
On-state voltage drop: Must not significantly exceed 1.35V to avoid excessive power dissipation
Package type: TO-220F through-hole mounting required for mechanical compatibility
SCR recovery type: Standard Recovery classification must be maintained
Temperature range: Must support -40°C to 150°C operation
Compliance: RoHS compliance required

The TYN16X-800RT,127 meets these substitution criteria with higher voltage and current ratings, providing design margin while maintaining electrical and mechanical compatibility.

Parameter Comparison

Parameter	TFA107S (Main Part)	TYN16X-800RT,127 (Substitute)
Manufacturer	Sanken Electric USA Inc.	WeEn Semiconductors
Voltage - Off State	700 V	800 V
Current - On State (It (RMS)) (Max)	15.7 A	16 A
Voltage - On State (Vtm) (Max)	1.35 V	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA	25 mA
Voltage - Gate Trigger (Vgt) (Max)	1 V	1.3 V
Current - Hold (Ih) (Max)	20 mA	40 mA
Current - Off State (Max)	2 mA	1 mA
Current - Non Rep. Surge (50Hz)	160 A	210 A
Current - Non Rep. Surge (60Hz)	176 A	231 A
SCR Type	Standard Recovery	Standard Recovery
Package / Case	TO-220-3 Full Pack	TO-220-3 Full Pack, Isolated Tab
Operating Temperature	-40°C ~ 150°C	-40°C ~ 150°C
RoHS Status	RoHS Compliant	RoHS Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The TYN16X-800RT,127 is a direct substitute for the TFA107S based on the following factors:

Product availability: The TYN16X-800RT,127 is active in production with 712 units in stock, whereas the TFA107S is obsolete
Electrical compatibility: The substitute exceeds the original part's voltage and current ratings, providing design margin without circuit modification
Compliance alignment: Both parts maintain RoHS compliance and identical operating temperature ranges
Package compatibility: Both use TO-220F through-hole packaging, enabling direct mechanical replacement
Gate drive considerations: The substitute's higher gate trigger current (25 mA vs. 15 mA) and voltage (1.3V vs. 1V) are within typical gate drive circuit tolerances for standard recovery SCRs

The higher on-state voltage drop (1.5V vs. 1.35V) and increased hold current (40 mA vs. 20 mA) represent minor parameter shifts that do not preclude substitution in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the TYN16X-800RT,127 directly replace the TFA107S without circuit modification?

A: Yes. Both parts share identical package geometry (TO-220F), operating temperature range (-40°C to 150°C), and SCR recovery classification. The substitute's higher voltage and current ratings provide design margin in most applications.

Q: What is the significance of the higher gate trigger current in the substitute?

A: The TYN16X-800RT,127 requires 25 mA gate trigger current versus 15 mA for the TFA107S. Existing gate drive circuits designed for the original part must supply sufficient current to reliably trigger the substitute. Most standard gate drive implementations accommodate this difference without modification.

Q: Does the isolated tab option on the TYN16X-800RT,127 affect compatibility?

A: The isolated tab is a mechanical feature that provides electrical isolation between the tab and the semiconductor junction. This option enhances thermal management flexibility but does not prevent direct substitution. Verify that your heatsink design accommodates the isolated tab configuration if thermal isolation is required.

Q: Why is the off-state leakage current lower in the substitute?

A: The TYN16X-800RT,127 exhibits 1 mA maximum off-state current compared to 2 mA for the TFA107S. This represents improved leakage characteristics and does not affect substitution compatibility.

Q: Are there any compliance or certification differences between these parts?

A: Both parts are RoHS compliant with identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications. No compliance barriers exist for substitution.

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