Equivalent & Substitute Parts for 3N258

Part Overview

The 3N258 is a single-phase bridge rectifier manufactured by onsemi, rated for 800 V peak reverse voltage and 2 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 3N258 features a KBPM package with through-hole mounting and operates across a temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	3N258
Manufacturer	onsemi
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 3N258 is determined by the following critical parameters:

Voltage - Peak Reverse (Max): 800 V minimum requirement
Current - Average Rectified (Io): 2 A minimum requirement
Diode Type: Single Phase bridge rectifier
Mounting Type: Through Hole
Operating Temperature Range: Must support the application's thermal requirements

Substitute parts are grouped into two categories:

Category 1: Direct Voltage and Current Match (800 V, 2 A) Parts meeting or exceeding both 800 V and 2 A specifications with active product status and modern compliance certifications.

Category 2: Voltage Match with Lower Current Rating (800 V, 1.5 A) Parts meeting the 800 V requirement but with reduced current capacity, suitable only for applications with lower current demands than the original 2 A specification.

Category 3: Lower Voltage Ratings (50 V to 1 kV) Parts from the same series with different voltage ratings, applicable only when circuit voltage requirements differ from the original 800 V specification.

Parameter Comparison

Parameter	3N258 (onsemi)	KBP208G (SMC Diode Solutions)	KBP08G (Diodes Incorporated)	VS-2KBP08 (Vishay)
Voltage - Peak Reverse (Max)	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	2 A	2 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A	1.1 V @ 2 A	1.1 V @ 1.5 A	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-40°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-ESIP	4-SIP, KBP	4-SIP, D-44
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: KBP208G (SMC Diode Solutions)

KBP208G is the recommended primary substitute for the 3N258. It matches the original specifications exactly: 800 V peak reverse voltage, 2 A average rectified current, and identical operating temperature range (-55°C to 150°C). The part is active in production status and ROHS3 compliant, ensuring long-term availability and regulatory compliance. The 4-ESIP package provides mechanical compatibility with through-hole mounting applications.

Secondary Substitute: VS-2KBP08 (Vishay General Semiconductor - Diodes Division)

VS-2KBP08 provides an alternative from the established VS-2KBP series. It meets the 800 V and 2 A requirements with ROHS3 compliance and active product status. The D-44 package is mechanically compatible with through-hole mounting. The operating temperature range extends to -40°C minimum, which is acceptable for most applications requiring -55°C operation, though verification is necessary for extreme low-temperature environments.

Conditional Substitute: KBP08G (Diodes Incorporated)

KBP08G is suitable only for applications where the current requirement can be reduced to 1.5 A. While it maintains the 800 V rating and active product status with ROHS3 compliance, the lower current rating makes it unsuitable as a direct replacement for designs requiring the full 2 A capacity. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin.

Lower Voltage Alternatives from VS-2KBP Series

Parts VS-2KBP02 (200 V), VS-2KBP04 (400 V), VS-2KBP06 (600 V), and VS-2KBP10 (1 kV) are available for applications with different voltage requirements. These maintain the 2 A current rating and are ROHS3 compliant with active product status. Selection depends on the actual circuit voltage specification.

Frequently Asked Questions (FAQ)

Q: Can KBP08G replace the 3N258 in all applications?

A: KBP08G is suitable only for applications where the average rectified current requirement is 1.5 A or less. The 3N258 is rated for 2 A, so KBP08G cannot serve as a direct replacement for designs requiring the full 2 A capacity. Verify your circuit's actual current demand before selecting this part.

Q: What is the difference between the KBPM and KBP packages?

A: Both KBPM and KBP are 4-SIP through-hole packages formats for single-phase bridge rectifiers. While mechanically similar, physical dimensions and pin spacing may differ slightly. Verify PCB footprint compatibility before substitution, particularly for legacy designs with tight layout constraints.

Q: Are all substitute parts ROHS3 compliant?

A: KBP208G, KBP08G, and VS-2KBP08 are all ROHS3 compliant. The original 3N258 does not specify RoHS status. If RoHS compliance is a regulatory requirement for your application, confirm that your selected substitute meets the applicable directive version.

Q: Does the operating temperature range difference between substitutes affect selection?

A: The 3N258 operates from -55°C to 150°C. KBP08G extends to -65°C (wider range), while VS-2KBP08 operates from -40°C to 150°C (narrower minimum). For applications requiring operation below -40°C, VS-2KBP08 is unsuitable. For applications above -55°C, VS-2KBP08 is acceptable.

Q: Can I use a higher voltage-rated part like VS-2KBP10 (1 kV) as a substitute?

A: Yes, VS-2KBP10 can be used in circuits designed for 800 V operation. Higher voltage ratings provide additional safety margin and are electrically compatible. However, verify that the D-44 package footprint matches your PCB design, as package differences may require layout modifications.

Q: What is the significance of the forward voltage (Vf) differences between parts?

A: Forward voltage differences affect power dissipation and heat generation. The 3N258 specifies 1.1 V @ 3.14 A, while VS-2KBP08 specifies 1 V @ 1 A. These measurements are taken at different current levels, making direct comparison difficult. Consult detailed datasheets for forward voltage characteristics across your operating current range to assess thermal impact.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message