2KBP04M-M4/51 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The 2KBP04M-M4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 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. The part operates across a temperature range of -55°C to 165°C and is packaged in a 4-SIP KBPM through-hole configuration. ROHS3 compliance and unlimited moisture sensitivity rating ensure environmental and reliability standards are met.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max)	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 400 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 2KBP04M-M4/51 is determined by the following critical parameters:

Voltage - Peak Reverse (Max): 400 V minimum
Current - Average Rectified (Io): 2 A or greater
Diode Type: Single Phase
Technology: Standard
Mounting Type: Through Hole
Forward voltage characteristics: 1.1 V maximum at rated current
Reverse leakage: 5 µA @ 400 V maximum
RoHS compliance: ROHS3 Compliant

The substitute parts identified below meet or exceed these electrical specifications and maintain compatibility with through-hole PCB assembly processes. Package variations (4-SIP vs. 4-ESIP) are acceptable provided pin configuration and footprint compatibility are verified for the specific application.

Parameter Comparison

Parameter	2KBP04M-M4/51 (Vishay)	KBP04G (Diodes Inc.)	KBP204G (SMC Diode)
Manufacturer	Vishay General Semiconductor	Diodes Incorporated	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Type	Single Phase	Single Phase	Single Phase
Voltage - Peak Reverse (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	2 A	1.5 A	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 @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 165°C	-65°C ~ 150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP	4-ESIP, KBP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

KBP204G (SMC Diode Solutions) is the primary substitute for the 2KBP04M-M4/51. This part maintains identical voltage and current ratings (400 V, 2 A), matching the original specification exactly. Both components are ROHS3 compliant. The KBP204G is currently in active production with 1230 units in stock, ensuring long-term availability. The operating temperature range (-55°C ~ 150°C) is slightly reduced compared to the original (-55°C ~ 165°C), which is acceptable for most industrial applications. The 4-ESIP package differs from the original 4-SIP KBPM, requiring PCB footprint verification before implementation.

KBP04G (Diodes Incorporated) is a secondary substitute option. This part meets the 400 V voltage requirement and maintains identical forward voltage characteristics. However, the current rating is reduced to 1.5 A, which is below the original 2 A specification. This part is suitable only for applications where the actual load current does not exceed 1.5 A. The KBP04G is in active production with 2264 units available. The operating temperature range extends to -65°C, providing improved low-temperature performance. The 4-SIP KBP package is mechanically similar to the original KBPM package.

Selection between KBP204G and KBP04G depends on application current requirements. For designs requiring the full 2 A rating, KBP204G is mandatory. For reduced-current applications, KBP04G offers extended low-temperature capability.

Frequently Asked Questions (FAQ)

Q: Can KBP04G replace the 2KBP04M-M4/51 in all applications?

A: No. The KBP04G is rated for 1.5 A average rectified current, while the original part is rated for 2 A. Substitution is valid only if the actual circuit current does not exceed 1.5 A. Exceeding this rating will cause component failure and circuit malfunction.

Q: What is the difference between the 4-SIP and 4-ESIP packages?

A: Both are through-hole packages with four pins. The 4-SIP (Single In-line Package) and 4-ESIP (Enhanced Single In-line Package) differ in physical dimensions and pin spacing. PCB footprint compatibility must be verified before substitution. Consult the respective datasheets for exact pin configurations and hole spacing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both KBP04G and KBP204G are ROHS3 compliant, matching the environmental standards of the original 2KBP04M-M4/51.

Q: Does REACH status affect component selection?

A: The KBP204G is REACH Affected, while the original part and KBP04G are REACH Unaffected. For applications subject to REACH regulations, verify compliance requirements with your procurement and regulatory teams. The KBP04G is the preferred choice for REACH-sensitive applications.

Q: What is the impact of the reduced operating temperature range in substitute parts?

A: The KBP04G and KBP204G have maximum operating temperatures of 150°C, compared to 165°C for the original part. This 15°C reduction is acceptable for most industrial applications. Applications requiring operation above 150°C require design review and alternative component selection.

Q: Can I use these parts interchangeably on the same PCB?

A: No. The different package types (4-SIP KBPM vs. 4-SIP KBP vs. 4-ESIP) have different physical footprints. Each substitution requires PCB layout verification and potential redesign of the component mounting area.

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