S4065KTP Equivalent & Substitute Parts

Part Overview

The S4065KTP is a Silicon Controlled Rectifier (SCR) manufactured by Littelfuse Inc., rated for 400V off-state voltage with 65A RMS on-state current capability. This thyristor is designed for standard recovery applications in through-hole TO-218 isolated tab packaging. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Alternative components may be required due to inventory constraints, application-specific voltage requirements, or design optimization needs.

Key Parameters

Parameter	S4065KTP
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	65 A
Voltage - On State (Vtm) (Max)	1.8 V
Current - Gate Trigger (Igt) (Max)	50 mA
Voltage - Gate Trigger (Vgt) (Max)	2 V
SCR Type	Standard Recovery
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-218-3 Isolated Tab
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The BTW69-600RG from STMicroelectronics is identified as a manufacturer-recommended substitute for the S4065KTP. Substitution eligibility is determined by the following criteria:

Mandatory Compatibility Parameters:

SCR Type: Both parts are Standard Recovery thyristors
Operating Temperature Range: Both support -40°C to 125°C
Mounting Type: Both are through-hole devices
RoHS3 Compliance: Both meet ROHS3 requirements
Regulatory Status: Both are REACH Unaffected and classified as EAR99

Voltage Consideration: The BTW69-600RG operates at 600V off-state voltage, which exceeds the S4065KTP's 400V rating. This higher voltage rating provides additional design margin in applications where the circuit voltage does not exceed 400V.

Current Consideration: The BTW69-600RG is rated for 50A RMS on-state current, which is lower than the S4065KTP's 65A rating. Applications requiring the full 65A capacity cannot use this substitute.

Package Difference: The BTW69-600RG uses TOP-3 packaging, while the S4065KTP uses TO-218 isolated tab packaging. These are distinct mechanical formats requiring different PCB footprints and mounting considerations.

Parameter Comparison

Parameter	S4065KTP	BTW69-600RG	Notes
Manufacturer	Littelfuse Inc.	STMicroelectronics	Different manufacturers
Voltage - Off State	400 V	600 V	BTW69-600RG rated higher
Voltage - Gate Trigger (Vgt) (Max)	2 V	1.3 V	BTW69-600RG requires lower gate voltage
Current - Gate Trigger (Igt) (Max)	50 mA	80 mA	BTW69-600RG requires higher gate current
Voltage - On State (Vtm) (Max)	1.8 V	1.9 V	Comparable on-state voltage
Current - On State (It (RMS)) (Max)	65 A	50 A	S4065KTP rated higher
Current - Hold (Ih) (Max)	80 mA	150 mA	BTW69-600RG requires higher hold current
Current - Off State (Max)	20 µA	10 µA	BTW69-600RG has lower leakage
SCR Type	Standard Recovery	Standard Recovery	Identical type
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Identical range
Package / Case	TO-218-3 Isolated Tab	TOP-3	Different mechanical packages
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

S4065KTP Selection Criteria:

Applications requiring 65A RMS on-state current capacity
Circuits designed for TO-218 isolated tab package footprint
Systems where gate trigger voltage of 2V maximum is specified
Designs requiring 400V off-state voltage rating

BTW69-600RG Selection Criteria:

Applications operating at voltages below 400V where higher voltage margin is beneficial
Circuits where on-state current requirement does not exceed 50A RMS
Designs compatible with TOP-3 package mechanical format
Systems where lower gate trigger voltage (1.3V maximum) provides circuit advantage
Applications where lower off-state leakage current (10µA) is required

Both parts maintain active production status, full RoHS3 compliance, and identical operating temperature ranges. Package and current rating differences are the primary limiting factors for substitution.

Frequently Asked Questions (FAQ)

Q: Can BTW69-600RG replace S4065KTP in all applications?

A: No. The BTW69-600RG has a lower on-state current rating (50A RMS versus 65A RMS) and uses a different package format (TOP-3 versus TO-218 isolated tab). Substitution is only valid when circuit current requirements do not exceed 50A RMS and the PCB layout can accommodate TOP-3 packaging.

Q: What is the significance of the higher 600V rating on the BTW69-600RG?

A: The 600V off-state voltage rating on the BTW69-600RG provides additional voltage margin compared to the 400V rating of the S4065KTP. In applications where circuit voltage remains below 400V, this higher rating does not provide functional advantage but does increase design safety margin.

Q: Are the gate trigger parameters compatible between these parts?

A: The gate trigger parameters differ. The S4065KTP requires a maximum of 2V gate trigger voltage and 50mA gate trigger current, while the BTW69-600RG requires a maximum of 1.3V gate trigger voltage and 80mA gate trigger current. Gate drive circuits must be verified for compatibility with the selected part.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the S4065KTP and BTW69-600RG are ROHS3 compliant, REACH unaffected, and classified as EAR99. Both support the identical operating temperature range of -40°C to 125°C.

Q: What is the primary limitation preventing universal substitution?

A: The primary limitation is the on-state current rating difference. The S4065KTP is rated for 65A RMS while the BTW69-600RG is rated for 50A RMS. Applications requiring the full 65A capacity cannot use the BTW69-600RG as a substitute.

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