3N258-M4/51 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The 3N258-M4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, 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 ongoing design support and procurement.

Bridge rectifiers in this voltage and current class are used in AC-to-DC conversion applications requiring standard rectification performance. The obsolete status of the 3N258-M4/51 necessitates identification of active alternative components that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
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 ~ 165°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
Diode Type	Single Phase
Technology	Standard

Substitute Part Grouping Explanation

Substitution eligibility for the 3N258-M4/51 is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must equal or exceed 800 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Diode Type: Must be Single Phase
Technology: Must be Standard
Mounting Type: Must be Through Hole
Forward voltage characteristics: Must be compatible at rated current
Reverse leakage: Must not exceed specified limits

The substitute parts identified below satisfy these electrical requirements while maintaining through-hole mounting compatibility. Package form factors may differ (KBPM vs. KBP variants) but remain mechanically compatible for standard PCB mounting applications.

Parameter Comparison

Parameter	3N258-M4/51 (Vishay)	KBP08G (Diodes Inc.)	KBP208G (SMC Diode)
Voltage - Peak Reverse (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	2 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A	1.1 V @ 1.5 A	1.1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 165°C (TJ)	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP	4-ESIP
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

KBP208G (SMC Diode Solutions) is the primary substitute for the 3N258-M4/51. This component matches the original specification exactly: 800 V peak reverse voltage, 2 A average rectified current, and identical forward voltage characteristics at rated current. Both components maintain ROHS3 compliance. The KBP208G is currently in active production with 19,035 units in stock, ensuring long-term availability. Operating temperature range is -55°C to 150°C, which covers the lower end of the original -55°C to 165°C specification.

KBP08G (Diodes Incorporated) is a secondary substitute option. This component meets the 800 V voltage requirement and maintains identical reverse leakage and forward voltage characteristics. However, the average rectified current rating is 1.5 A, which is below the original 2 A specification. This component is suitable only for applications where the actual operating current does not exceed 1.5 A. The KBP08G is active in production with 1,425 units available. Operating temperature range is -65°C to 150°C.

Both substitute parts are RoHS3 compliant and maintain through-hole mounting compatibility with standard PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can KBP08G replace the 3N258-M4/51 in all applications?

A: No. The KBP08G has a maximum average rectified current rating of 1.5 A, compared to the original 2 A specification. Use KBP08G only in applications where actual operating current does not exceed 1.5 A. For applications requiring the full 2 A rating, use KBP208G.

Q: What is the difference between KBPM and KBP package designations?

A: Both are 4-SIP (Single In-line Package) through-hole configurations. KBPM and KBP are manufacturer-specific package identifiers for the same physical form factor. Both are mechanically compatible with standard PCB mounting.

Q: Are there temperature range differences between the original and substitutes?

A: Yes. The original 3N258-M4/51 operates from -55°C to 165°C. The KBP208G operates from -55°C to 150°C, and the KBP08G operates from -65°C to 150°C. If your application requires operation above 150°C, neither substitute is suitable.

Q: What is the REACH status difference between KBP208G and the other parts?

A: The KBP208G is REACH Affected, while the original 3N258-M4/51 and KBP08G are REACH Unaffected. This distinction may be relevant for applications subject to REACH regulatory requirements. Verify compliance requirements for your specific application.

Q: Are all three components RoHS3 compliant?

A: Yes. The 3N258-M4/51, KBP08G, and KBP208G are all RoHS3 compliant.

Q: What is the inventory status for these parts?

A: The original 3N258-M4/51 has 1,087 units in stock but is obsolete. KBP08G has 1,425 units available. KBP208G has 19,035 units available and is the recommended substitute with the highest inventory level.

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