VS-40TTS12PBF Equivalent & Substitute Parts

Part Overview

The VS-40TTS12PBF is a Silicon Controlled Rectifier (SCR) rated for 1.2 kV off-state voltage with 40 A RMS on-state current in a TO-220-3 through-hole package. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Off State	1.2 kV
Current - On State (It (RMS))	40 A
Voltage - On State (Vtm) (Max)	1.6 V
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	35 mA
Current - Hold (Ih) (Max)	100 mA
SCR Type	Standard Recovery
Operating Temperature Range	-40°C to 140°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the VS-40TTS12PBF is determined by the following critical parameters:

Voltage Rating (Off State): Must equal 1.2 kV
SCR Type: Must be Standard Recovery
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass or exceed -40°C to 140°C
Gate Trigger Parameters: Vgt (Max) and Igt (Max) must be within acceptable design margins
On-State Characteristics: Vtm (Max) and holding current must support circuit requirements

Two substitute categories are identified:

Category 1 - Direct Equivalent (Same Package, Same Current Rating) VS-40TTS12-M3 maintains identical electrical specifications and TO-220-3 packaging with active product status.

Category 2 - Higher Current Capability (Different Package) CLA80E1200HF provides superior current handling (126 A RMS) in PLUS247-3 package with enhanced thermal performance, suitable for designs requiring increased current margin or thermal headroom.

Parameter Comparison

Parameter	VS-40TTS12PBF	VS-40TTS12-M3	CLA80E1200HF
Voltage - Off State	1.2 kV	1.2 kV	1.2 kV
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.3 V	1.5 V
Current - Gate Trigger (Igt) (Max)	35 mA	35 mA	38 mA
Voltage - On State (Vtm) (Max)	1.6 V	1.6 V	1.77 V
Current - On State (It (AV)) (Max)	25 A	25 A	80 A
Current - On State (It (RMS)) (Max)	40 A	40 A	126 A
Current - Hold (Ih) (Max)	100 mA	100 mA	100 mA
Current - Off State (Max)	500 µA	500 µA	50 µA
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature Range	-40°C to 140°C	-40°C to 140°C	-40°C to 150°C
Package / Case	TO-220-3	TO-220-3	TO-247-3 Variant
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

VS-40TTS12-M3 is the primary substitute for direct replacement. This Vishay part maintains identical electrical specifications and TO-220-3 packaging while offering active product status and higher inventory availability (2400 pcs vs. 2080 pcs for the original). No circuit redesign is required for this substitution.

CLA80E1200HF serves as an alternative for applications requiring increased current capacity or improved thermal performance. The IXYS PLUS247-3 package provides superior heat dissipation compared to TO-220-3. This substitution requires PCB layout modification to accommodate the different package footprint. The higher on-state voltage (1.77 V vs. 1.6 V) and gate trigger voltage (1.5 V vs. 1.3 V) must be evaluated within the specific circuit context.

Both substitutes maintain ROHS3 compliance and are classified as REACH Unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can VS-40TTS12-M3 be used as a direct drop-in replacement for VS-40TTS12PBF?

A: Yes. VS-40TTS12-M3 is electrically and mechanically identical to VS-40TTS12PBF. Both share the same voltage rating (1.2 kV), current rating (40 A RMS), gate trigger specifications, and TO-220-3 package. No circuit modifications are required.

Q: What are the key differences between VS-40TTS12-M3 and CLA80E1200HF?

A: The primary differences are current rating (40 A vs. 126 A RMS), package type (TO-220-3 vs. PLUS247-3), on-state voltage (1.6 V vs. 1.77 V), and gate trigger voltage (1.3 V vs. 1.5 V). CLA80E1200HF is suitable for higher-current applications or designs requiring enhanced thermal performance.

Q: Is CLA80E1200HF a pin-compatible replacement?

A: No. CLA80E1200HF uses PLUS247-3 package while VS-40TTS12PBF uses TO-220-3 package. Although both are three-terminal through-hole packages, the physical dimensions and pin spacing differ. PCB layout modification is required.

Q: Do all three parts meet the same compliance standards?

A: Yes. VS-40TTS12PBF, VS-40TTS12-M3, and CLA80E1200HF are all ROHS3 compliant and REACH Unaffected, meeting equivalent regulatory requirements.

Q: Which substitute should I select for a new design?

A: For applications matching the original 40 A RMS specification, VS-40TTS12-M3 is recommended due to identical electrical characteristics and active product status. For applications requiring higher current capacity or improved thermal performance, CLA80E1200HF is appropriate if PCB layout can accommodate PLUS247-3 packaging.

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