25TTS12S SCR Equivalent & Substitute Parts

Part Overview

The 25TTS12S is a 1.2 kV, 25 A standard recovery SCR manufactured by Vishay General Semiconductor - Diodes Division in a surface mount TO-263AB (D2PAK) package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -40°C to 125°C and is RoHS non-compliant.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	1.2	kV
Voltage - Gate Trigger (Vgt) Max	2	V
Current - Gate Trigger (Igt) Max	45	mA
Voltage - On State (Vtm) Max	1.25	V
Current - On State (It RMS) Max	25	A
Current - Hold (Ih) Max	100	mA
Operating Temperature Range	-40 to 125	°C
Package Type	TO-263-3 (D2PAK)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the 25TTS12S is determined by the following critical parameters:

Off-state voltage rating: Must equal or exceed 1.2 kV
RMS current rating: Must equal or exceed 25 A
Package compatibility: Must be TO-263-3 (D2PAK) surface mount
Operating temperature range: Must support -40°C to 125°C
SCR type: Standard recovery classification

The two substitute parts listed below meet these criteria:

CS19-12HO1S-TRL (IXYS): Matches the 1.2 kV voltage rating and exceeds the 25 A RMS current requirement at 29 A. Maintains identical package and temperature specifications. Product status is active with ROHS3 compliance.

CS19-08HO1S-TRL (IXYS): Operates at 800 V off-state voltage, which is below the 1.2 kV requirement of the original part. This part is listed as a secondary option and is suitable only for applications where the lower voltage rating is acceptable.

Parameter Comparison

Parameter	25TTS12S (Vishay)	CS19-12HO1S-TRL (IXYS)	CS19-08HO1S-TRL (IXYS)
Voltage - Off State (kV)	1.2	1.2	0.8
Voltage - Gate Trigger Max (V)	2	1.5	1.5
Current - Gate Trigger Max (mA)	45	28	28
Voltage - On State Max (V)	1.25	1.6	1.6
Current - On State RMS Max (A)	25	29	29
Current - Hold Max (mA)	100	50	50
Current - Off State Max (µA)	500	5000	5000
Operating Temperature Range (°C)	-40 to 125	-40 to 125	-40 to 125
Package / Case	TO-263-3 (D2PAK)	TO-263-3 (D2PAK)	TO-263-3 (D2PAK)
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: CS19-12HO1S-TRL

This part is the direct functional equivalent for the 25TTS12S. It maintains the 1.2 kV voltage rating, exceeds the 25 A RMS current specification at 29 A, and is housed in the identical TO-263-3 (D2PAK) package. The part is currently in active production status with ROHS3 compliance certification, providing superior long-term availability and regulatory alignment compared to the obsolete original part.

Secondary Substitute: CS19-08HO1S-TRL

This part is suitable only for applications where the circuit voltage does not exceed 800 V. While it shares the same package footprint and temperature range, the reduced voltage rating restricts its use to lower-voltage system designs. This part is also active and ROHS3 compliant.

Both substitute parts are manufactured by IXYS and are available in tape and reel packaging for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CS19-08HO1S-TRL be used as a direct replacement for 25TTS12S?

A: No. The CS19-08HO1S-TRL has a maximum off-state voltage rating of 800 V, which is insufficient for circuits designed for the 1.2 kV rating of the 25TTS12S. Use this part only if your application operates at 800 V or below.

Q: Is CS19-12HO1S-TRL a pin-for-pin compatible replacement?

A: Yes. Both parts use the TO-263-3 (D2PAK) package with identical pinout and footprint, enabling direct PCB substitution without layout modifications.

Q: What are the differences in gate trigger characteristics?

A: The CS19-12HO1S-TRL has a lower gate trigger voltage (1.5 V vs. 2 V) and lower gate trigger current (28 mA vs. 45 mA) compared to the 25TTS12S. These differences may affect gate drive circuit design; verify compatibility with your existing gate drive implementation.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The 25TTS12S is RoHS non-compliant, while both IXYS substitutes (CS19-12HO1S-TRL and CS19-08HO1S-TRL) are ROHS3 compliant. This provides regulatory advantage for new designs and procurement.

Q: What is the current availability status of these substitutes?

A: CS19-12HO1S-TRL has 1023 pieces in stock. CS19-08HO1S-TRL has 1587 pieces in stock. Both parts are in active production.

Q: Do the substitute parts support the same operating temperature range?

A: Yes. All three parts operate across -40°C to 125°C, maintaining thermal compatibility for the same application environments.

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