Equivalent & Substitute Parts for Microchip Technology S3840

Part Overview

The Microchip Technology S3840 is a general-purpose rectifier diode rated for 400V DC reverse voltage with 100A average rectified current in a DO-203AB (DO-5) stud mount package. This component is classified as Active product status and utilizes standard recovery technology. Substitute parts are identified when equivalent electrical performance parameters are required but the primary part is unavailable or when specific application constraints necessitate alternative component selection within the same functional category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	100	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 200 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	25	µA @ 400 V
Package / Case	DO-203AB, DO-5, Stud	-
Mounting Type	Stud Mount	-
Operating Temperature - Junction	-65°C ~ 200°C	-
Product Status	Active	-

Substitute Part Grouping Explanation

Substitute parts for the S3840 are identified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400V
Package / Case: DO-203AB (DO-5) Stud Mount
Technology: Standard Recovery
Product Status: Active

Allowable Variation Parameters:

Current - Average Rectified (Io): Substitutes must equal or exceed the application requirement
Voltage - Forward (Vf): Substitutes with higher forward voltage are acceptable if circuit design accommodates the increased voltage drop
Operating Temperature Range: Substitutes with narrower or equivalent temperature ranges are acceptable if application requirements are met
Reverse Leakage Current: Substitutes with equal or lower leakage current are acceptable

The Vishay General Semiconductor VS-50PF40 is identified as a substitute part; however, its Current - Average Rectified (Io) rating of 50A is lower than the S3840 specification of 100A. This part is suitable only for applications requiring 50A or less.

Parameter Comparison

Parameter	S3840 (Microchip)	VS-50PF40 (Vishay)	Compatibility Notes
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Matched
Current - Average Rectified (Io)	100 A	50 A	VS-50PF40 rated for lower current
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 200 A	1.4 V @ 125 A	VS-50PF40 has higher forward voltage
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Matched
Current - Reverse Leakage @ Vr	25 µA @ 400 V	Not specified	Not provided for comparison
Package / Case	DO-203AB, DO-5, Stud	DO-203AB, DO-5, Stud	Matched
Mounting Type	Stud Mount	Chassis, Stud Mount	Matched
Operating Temperature - Junction	-65°C ~ 200°C	-55°C ~ 180°C	VS-50PF40 has narrower range
Product Status	Active	Active	Matched

Engineering Selection Recommendations

Primary Part Selection: The Microchip Technology S3840 is the specified component for applications requiring 100A average rectified current at 400V DC reverse voltage. This part maintains Active product status and is available in inventory (1007 pieces).

Substitute Part Consideration: The Vishay General Semiconductor VS-50PF40 is suitable as a substitute only for applications with current requirements of 50A or less. This part is also Active status and available in inventory (779 pieces). The VS-50PF40 exhibits higher forward voltage (1.4V @ 125A versus 1.15V @ 200A) and a narrower operating temperature range (-55°C ~ 180°C versus -65°C ~ 200°C).

Both parts share identical voltage ratings (400V), package specifications (DO-203AB/DO-5 Stud Mount), and recovery speed characteristics. Both parts maintain REACH Unaffected status and EAR99 ECCN classification.

Selection between these parts must be based on the specific current requirement of the application. The S3840 is required for applications demanding the full 100A rating. The VS-50PF40 is a valid substitute only when application current does not exceed 50A.

Frequently Asked Questions (FAQ)

Q: Can the VS-50PF40 replace the S3840 in all applications?

A: No. The VS-50PF40 is rated for 50A average rectified current, while the S3840 is rated for 100A. The VS-50PF40 is suitable only for applications requiring 50A or less. Applications requiring the full 100A specification must use the S3840.

Q: Are the package specifications identical between these parts?

A: Yes. Both the S3840 and VS-50PF40 use the DO-203AB (DO-5) stud mount package. Both support stud mount installation and are mechanically compatible.

Q: What is the difference in forward voltage between these parts?

A: The S3840 has a maximum forward voltage of 1.15V at 200A, while the VS-50PF40 has a maximum forward voltage of 1.4V at 125A. The higher forward voltage of the VS-50PF40 results in greater voltage drop across the diode during conduction.

Q: Do both parts have the same voltage rating?

A: Yes. Both the S3840 and VS-50PF40 are rated for 400V DC reverse voltage (Vr).

Q: What is the operating temperature difference between these parts?

A: The S3840 operates from -65°C to 200°C junction temperature, while the VS-50PF40 operates from -55°C to 180°C. The S3840 has a wider operating range, particularly at lower temperatures.

Q: Are both parts currently in production?

A: Yes. Both the S3840 and VS-50PF40 maintain Active product status.

Q: What recovery speed characteristics do these parts share?

A: Both parts utilize standard recovery technology with recovery time greater than 500ns at currents greater than 200mA (Io).

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