TFA108S Equivalent & Substitute Parts

Part Overview

The TFA108S is an 800V, 15.7A SCR (Silicon Controlled Rectifier) manufactured by Sanken Electric USA Inc., packaged in TO-220F-3 configuration for through-hole mounting. 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 is RoHS compliant with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It RMS)	15.7	A
Voltage - On State (Vtm Max)	1.35	V
Voltage - Gate Trigger (Vgt Max)	1	V
Current - Gate Trigger (Igt Max)	15	mA
Current - Hold (Ih Max)	20	mA
Operating Temperature Range	-40 to 150	°C
Package Type	TO-220-3	-
SCR Type	Standard Recovery	-

Substitute Part Grouping Explanation

Substitution of the TFA108S is determined by matching the following critical parameters:

Blocking Voltage (Voff): 800V minimum
RMS Current Rating (It RMS): 15.7A or higher
On-State Voltage (Vtm): Within acceptable operating margins
Gate Trigger Characteristics: Compatible gate voltage and current thresholds
Package Configuration: TO-220-3 through-hole mounting
SCR Recovery Type: Standard Recovery classification
Temperature Operating Range: -40°C to 150°C minimum

The TYN16X-800RT,127 meets these substitution criteria with equivalent blocking voltage, higher current capacity, and compatible gate characteristics within the same package family.

Parameter Comparison

Parameter	TFA108S (Main)	TYN16X-800RT,127 (Substitute)	Unit
Voltage - Off State	800	800	V
Current - On State (It RMS)	15.7	16	A
Voltage - On State (Vtm Max)	1.35	1.5	V
Voltage - Gate Trigger (Vgt Max)	1	1.3	V
Current - Gate Trigger (Igt Max)	15	25	mA
Current - Hold (Ih Max)	20	40	mA
Current - Off State (Max)	2	1	mA
Operating Temperature Range	-40 to 150	-40 to 150	°C
Package Type	TO-220-3	TO-220-3	-
SCR Type	Standard Recovery	Standard Recovery	-
RoHS Status	Compliant	Compliant	-
Product Status	Obsolete	Active	-

Engineering Selection Recommendations

The TYN16X-800RT,127 manufactured by WeEn Semiconductors is a direct functional substitute for the obsolete TFA108S. Both components share identical blocking voltage (800V), equivalent RMS current ratings (15.7A vs. 16A), and compatible gate trigger characteristics. The substitute maintains the same operating temperature range and package configuration, ensuring mechanical and thermal compatibility in existing designs.

The TYN16X-800RT,127 offers the advantage of active product status with current manufacturing availability (712 pcs in stock), whereas the TFA108S is obsolete. Both parts are RoHS compliant and carry identical ECCN and HTSUS classifications. The substitute's slightly higher on-state voltage (1.5V vs. 1.35V) and gate trigger current (25mA vs. 15mA) remain within acceptable design tolerances for standard SCR applications.

Frequently Asked Questions (FAQ)

Q: Can the TYN16X-800RT,127 directly replace the TFA108S in existing circuits?

A: Yes. Both components share the same 800V blocking voltage, equivalent RMS current ratings, and TO-220-3 package configuration. The substitute's electrical characteristics fall within acceptable operating margins for standard SCR applications.

Q: What is the primary reason for substitution?

A: The TFA108S is classified as obsolete. The TYN16X-800RT,127 is an active product with current manufacturing availability, ensuring long-term supply chain continuity.

Q: Are there package differences between these parts?

A: Both use TO-220-3 through-hole packages. The TYN16X-800RT,127 features an isolated tab option, which provides additional design flexibility without affecting basic substitution compatibility.

Q: How do the gate trigger characteristics compare?

A: The TFA108S has a maximum gate trigger voltage of 1V and current of 15mA. The TYN16X-800RT,127 specifies 1.3V and 25mA respectively. These differences are within acceptable tolerances for standard gate drive circuits.

Q: Are both parts RoHS compliant?

A: Yes. Both the TFA108S and TYN16X-800RT,127 are RoHS compliant with MSL 1 (unlimited moisture sensitivity rating).

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