40TPS08 Equivalent & Substitute Parts

Part Overview

The 40TPS08 is an SCR (Silicon Controlled Rectifier) rated for 800V off-state voltage with 55A RMS current capacity, manufactured by Vishay General Semiconductor - Diodes Division. This device is packaged in TO-247AC and designed for standard recovery thyristor applications requiring through-hole mounting. The 40TPS08 is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It (RMS))	55	A
Voltage - On State (Vtm) (Max)	1.85	V
Current - Gate Trigger (Igt) (Max)	150	mA
Operating Temperature Range	-40 to 125	°C
Mounting Type	Through Hole	-
SCR Type	Standard Recovery	-

Substitute Part Grouping Explanation

Substitution of the 40TPS08 is determined by the following critical parameters:

Voltage Rating (Off State): Must equal or exceed 800V to maintain blocking capability
Current Rating (RMS): Must support minimum 55A RMS continuous current
On-State Voltage (Vtm): Lower values indicate better efficiency; maximum 1.85V acceptable
Gate Trigger Current (Igt): Must not exceed 150mA for gate drive circuit compatibility
Operating Temperature Range: Must encompass -40°C to 125°C
SCR Type: Standard Recovery classification required
Mounting Configuration: Through-hole package required for PCB compatibility

The S8035KTP from Littelfuse Inc. qualifies as a substitute based on matching voltage rating (800V), compatible operating temperature range (-40°C to 125°C), standard recovery SCR type, and through-hole mounting. However, the S8035KTP is rated for 35A RMS current, which is lower than the 40TPS08's 55A RMS specification. This substitution is valid only for applications where the actual current demand does not exceed 35A RMS.

Parameter Comparison

Parameter	40TPS08 (Vishay)	S8035KTP (Littelfuse)	Unit
Voltage - Off State	800	800	V
Voltage - Gate Trigger (Vgt) (Max)	2.5	1.5	V
Current - Gate Trigger (Igt) (Max)	150	40	mA
Voltage - On State (Vtm) (Max)	1.85	1.8	V
Current - On State (It (RMS)) (Max)	55	35	A
Current - Hold (Ih) (Max)	150	50	mA
Current - Off State (Max)	500	20	µA
Operating Temperature	-40 to 125	-40 to 125	°C
Mounting Type	Through Hole	Through Hole	-
Package / Case	TO-247-3	TO-218-3 Isolated Tab	-
SCR Type	Standard Recovery	Standard Recovery	-
RoHS Status	Non-compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

The 40TPS08 is obsolete; the S8035KTP represents the available substitute from the manufacturer's recommended list. Selection of S8035KTP requires verification that circuit current demands do not exceed 35A RMS. The S8035KTP offers improved compliance status (ROHS3 Compliant versus non-compliant), lower gate trigger current requirement (40mA versus 150mA), and superior off-state leakage characteristics (20µA versus 500µA). Package transition from TO-247AC to TO-218 Isolated Tab requires PCB layout modification. Both devices maintain identical voltage rating and operating temperature range, ensuring thermal and blocking performance equivalence within the specified current limit.

Frequently Asked Questions (FAQ)

Q: Can the S8035KTP directly replace the 40TPS08 in all applications?

A: Direct replacement is valid only if the application's maximum continuous current does not exceed 35A RMS. The S8035KTP is rated for 35A RMS versus the 40TPS08's 55A RMS. Verify actual circuit current before substitution.

Q: What are the package differences between these devices?

A: The 40TPS08 uses TO-247AC packaging, while the S8035KTP uses TO-218 Isolated Tab packaging. Both are through-hole mount types, but PCB footprint and lead spacing differ. Layout redesign is required.

Q: Does the lower gate trigger current of the S8035KTP affect gate drive circuit design?

A: The S8035KTP requires only 40mA maximum gate trigger current compared to the 40TPS08's 150mA. Existing gate drive circuits designed for 150mA will function with the S8035KTP, but gate drive optimization may reduce component stress.

Q: Are there compliance differences between these parts?

A: Yes. The S8035KTP is ROHS3 compliant, while the 40TPS08 is non-compliant. For applications subject to RoHS regulations, the S8035KTP is the required choice.

Q: What is the significance of the lower off-state leakage current in the S8035KTP?

A: The S8035KTP exhibits 20µA maximum off-state leakage versus 500µA for the 40TPS08. Lower leakage reduces standby power consumption and heat generation in blocking mode.

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