Equivalent & Substitute Parts for 3N259-M4/51

Part Overview

The 3N259-M4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 1 kV peak reverse voltage and 2 A average rectified current. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part is housed in a 4-SIP KBPM package and is suitable for through-hole mounting applications requiring standard bridge rectification at 1 kV.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	1 kV
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max)	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 1000 V
Operating Temperature Range	-55°C ~ 165°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 3N259-M4/51 is determined by the following critical parameters:

Diode Type: Single Phase bridge rectifier configuration
Voltage Rating: 1 kV peak reverse voltage (minimum requirement)
Current Rating: Minimum 1.5 A average rectified current (original part rated 2 A)
Technology: Standard bridge rectifier technology
Mounting: Through-hole configuration
Package Family: KBP or KBPM 4-SIP packages

The identified substitutes KBP10G and KBP210G meet these core electrical and mechanical requirements. Both maintain the 1 kV voltage rating, single-phase bridge configuration, and through-hole mounting. Current ratings of 1.5 A and 1.2 A respectively represent acceptable alternatives for applications where the full 2 A capacity of the original part is not required, or where derating is acceptable within system design margins.

Parameter Comparison

Parameter	3N259-M4/51 (Vishay)	KBP10G (Diodes Inc.)	KBP210G (Diotec)
Manufacturer	Vishay General Semiconductor	Diodes Incorporated	Diotec Semiconductor
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
Voltage - Peak Reverse (Max)	1 kV	1 kV	1 kV
Current - Average Rectified (Io)	2 A	1.5 A	1.2 A
Voltage - Forward (Vf) (Max)	1.1 V @ 3.14 A	1.1 V @ 1.5 A	1.1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 1000 V	5 µA @ 1000 V	5 µA @ 1000 V
Operating Temperature Range	-55°C ~ 165°C (TJ)	-65°C ~ 150°C (TJ)	-50°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP	4-SIP, KBP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not applicable
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

KBP10G (Diodes Incorporated) is the primary substitute option. This part maintains full ROHS3 compliance matching the original 3N259-M4/51, carries active product status ensuring long-term availability, and provides 1.5 A rated current. The extended lower operating temperature limit (-65°C versus -55°C) offers improved performance margin in cold environments. The 4-SIP KBP package is mechanically compatible with standard through-hole PCB layouts designed for the original KBPM package.

KBP210G (Diotec Semiconductor) serves as a secondary substitute where ROHS3 compliance is not a design requirement. This part provides 1.2 A rated current and maintains the 1 kV voltage specification. RoHS status is listed as not applicable, and REACH compliance is vendor undefined, requiring verification against specific procurement requirements before selection.

Both substitutes are suitable for applications where the 2 A rating of the original part can be accommodated through system derating or where actual load current does not exceed the substitute part ratings.

Frequently Asked Questions (FAQ)

Q: Can KBP10G directly replace 3N259-M4/51 in existing designs?

A: Yes, for applications where average rectified current does not exceed 1.5 A. The KBP10G maintains identical voltage ratings (1 kV), forward voltage characteristics (1.1 V), and reverse leakage specifications (5 µA @ 1000 V). The 4-SIP KBP package is mechanically compatible with through-hole PCB layouts. Verify that system load current remains within the 1.5 A specification.

Q: What is the current rating difference between the original part and substitutes?

A: The 3N259-M4/51 is rated for 2 A average rectified current. KBP10G is rated for 1.5 A, and KBP210G is rated for 1.2 A. Selection depends on actual application current requirements and acceptable derating margins within the system design.

Q: Are there compliance differences between the substitute options?

A: KBP10G maintains ROHS3 compliance identical to the original part. KBP210G does not list ROHS3 compliance status and has undefined REACH compliance. For applications requiring regulatory compliance documentation, KBP10G is the recommended choice.

Q: Do the substitute parts have different operating temperature ranges?

A: Yes. The original 3N259-M4/51 operates from -55°C to 165°C. KBP10G operates from -65°C to 150°C, providing lower temperature capability but reduced upper temperature limit. KBP210G operates from -50°C to 150°C. Verify that the substitute temperature range accommodates your application environment.

Q: Are the packages physically identical?

A: Both substitutes use the 4-SIP KBP package, which is mechanically compatible with through-hole PCB designs. The original KBPM package and substitute KBP packages share the same 4-SIP form factor and pin configuration for standard bridge rectifier applications.

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