25TTS12FP SCR Thyristor Equivalent & Substitute Parts

Part Overview

The 25TTS12FP is a 1.2 kV, 25 A standard recovery silicon-controlled rectifier (SCR) manufactured by Vishay General Semiconductor - Diodes Division in a TO-220AB through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. The part operates across a temperature range of -40°C to 125°C and is designed for applications requiring high-voltage switching and power control in industrial and consumer electronics.

Substiute Parts

25TTS12FP

Vishay General Semiconductor - Diodes DivisionIn Stock: 2206925TTS12FP Datasheet

Current PartRFQ

CS19-12HO1

IXYSIn Stock: 3134CS19-12HO1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 25TTS12FP is determined by strict equivalence across the following critical parameters:

• Voltage Rating (Off State): Must equal 1.2 kV to ensure identical blocking voltage capability
• Current Rating (RMS): Must meet or exceed 25 A to maintain thermal and electrical performance
• Package Type: Must be TO-220-3 through-hole to ensure mechanical and thermal interface compatibility
• SCR Type: Must be standard recovery to match switching characteristics
• Operating Temperature Range: Must span -40°C to 125°C minimum
• Gate Trigger Parameters: Vgt and Igt must be within acceptable design margins for gate drive circuitry

The CS19-12HO1 manufactured by IXYS meets these substitution criteria with equivalent voltage and temperature ratings, identical package configuration, and compatible gate trigger specifications. This part is currently in active production status, addressing the obsolescence of the 25TTS12FP.

Parameter Comparison

Engineering Selection Recommendations

The CS19-12HO1 is the designated manufacturer-recommended substitute for the 25TTS12FP. Selection of this alternative is justified on the following grounds:

Product Status: The 25TTS12FP is obsolete, while the CS19-12HO1 is in active production, ensuring long-term availability and supply chain continuity.

Electrical Equivalence: Both devices share identical off-state voltage ratings (1.2 kV) and operating temperature ranges (-40°C to 125°C). The CS19-12HO1 provides higher RMS current capacity (29 A versus 25 A), offering improved thermal margin in applications operating near the original part's rating limits.

Compliance Status: The CS19-12HO1 is ROHS3 compliant, whereas the 25TTS12FP is non-compliant. This distinction is critical for applications subject to regulatory requirements in markets enforcing RoHS directives.

Package Compatibility: Both parts utilize identical TO-220-3 through-hole packaging, enabling direct mechanical and thermal interface substitution without PCB redesign.

Gate Drive Considerations: The CS19-12HO1 exhibits lower gate trigger voltage (1.5 V maximum versus 2 V) and gate trigger current (28 mA versus 45 mA), potentially reducing gate drive circuit power dissipation. Existing gate drive designs must be verified for compatibility with these lower thresholds.

Frequently Asked Questions (FAQ)

Q: Can the CS19-12HO1 be used as a direct replacement for the 25TTS12FP without circuit modifications?

A: The CS19-12HO1 is mechanically and electrically compatible for direct substitution in most applications. However, gate drive circuits must be evaluated to confirm operation within the lower gate trigger specifications (Vgt: 1.5 V max, Igt: 28 mA max). Existing designs operating at the upper limits of the original part's gate specifications may require adjustment.

Q: What is the significance of the difference in on-state voltage (Vtm)?

A: The CS19-12HO1 exhibits a higher on-state voltage drop (1.6 V versus 1.25 V). This results in increased power dissipation during conduction. Thermal analysis of the application is necessary to confirm that heatsinking remains adequate with the substitute part.

Q: Why is the non-repetitive surge current (Itsm) lower in the CS19-12HO1?

A: The CS19-12HO1 specifies lower surge current ratings (160 A and 180 A versus 350 A at 50 Hz). Applications requiring high transient current handling must be evaluated to ensure the substitute part's surge rating is sufficient for the intended duty cycle.

Q: Does the RoHS compliance difference affect substitution decisions?

A: RoHS compliance is a regulatory and supply chain consideration rather than a functional electrical parameter. The CS19-12HO1's ROHS3 compliance makes it suitable for applications and markets requiring RoHS-compliant components. The 25TTS12FP's non-compliance may restrict its use in certain jurisdictions or with specific customers.

Q: Are there any packaging or mounting differences between these parts?

A: Both the 25TTS12FP and CS19-12HO1 use TO-220-3 through-hole packages. The 25TTS12FP is supplied in Full-Pak format, while the CS19-12HO1 is supplied in tube packaging. This difference affects only handling and storage; the physical package dimensions and pin configuration are identical.

Q: What inventory considerations should be evaluated?

A: The 25TTS12FP has 22,025 pieces in stock (obsolete status), while the CS19-12HO1 has 3,075 pieces available (active status). For new designs, the CS19-12HO1 is the appropriate selection. For legacy system maintenance, existing 25TTS12FP inventory may be used until depletion, after which substitution to the CS19-12HO1 becomes necessary.