KBP04M Bridge Rectifier Single Phase 400V 1.5A Equivalent & Substitute Parts

Part Overview

The KBP04M is a single-phase bridge rectifier manufactured by onsemi, rated for 400 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The KBP04M operates across a wide temperature range of -55°C to 165°C and is housed in a 4-SIP KBPM package for through-hole mounting applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	KBP04M
Manufacturer	onsemi
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the KBP04M is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must be 400 V or greater to maintain voltage margin
Current - Average Rectified (Io): Must be 1.5 A or greater to support circuit current requirements
Diode Type: Must be single-phase bridge rectifier
Mounting Type: Must be through-hole compatible
Operating Temperature Range: Must encompass or exceed the application's thermal requirements

Parts meeting these criteria are classified as direct substitutes. Parts with voltage or current ratings below the KBP04M specification are listed as reference alternatives but do not qualify as functional equivalents for this application.

Parameter Comparison

Parameter	KBP04M (onsemi)	KBP04G (Diodes Inc.)	KBP204G (SMC)	VS-2KBP04 (Vishay)
Voltage - Peak Reverse (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1.5 A	1.5 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1.1 V @ 1.5 A	1.1 V @ 2 A	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	10 µA @ 400 V
Operating Temperature Range	-55°C ~ 165°C	-65°C ~ 150°C	-55°C ~ 150°C	-40°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP	4-ESIP	4-SIP, D-44
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Recommended Priority Order)

KBP04G (Diodes Incorporated) — Active product status with ROHS3 compliance. Matches 400 V / 1.5 A rating. Operating temperature range of -65°C to 150°C covers the lower end of the KBP04M specification but may be limiting for applications requiring the full -55°C to 165°C range. Package compatibility requires verification due to KBP variant designation.
KBP204G (SMC Diode Solutions) — Active product with ROHS3 compliance and higher current rating (2 A). Provides design margin above the 1.5 A requirement. Operating temperature range of -55°C to 150°C aligns with the KBP04M lower bound. Package designation (4-ESIP) differs from KBPM; physical footprint compatibility must be confirmed.
VS-2KBP04 (Vishay General Semiconductor) — Active product with ROHS3 compliance. Matches 400 V rating with 2 A current capacity. Forward voltage and reverse leakage characteristics are comparable. Operating temperature range of -40°C to 150°C does not extend to the KBP04M's -55°C minimum; unsuitable for applications requiring full temperature coverage.

Reference Alternatives (Lower Voltage Ratings)

The following parts do not meet substitution criteria due to insufficient voltage ratings but are listed for reference:

VS-2KBP02 (200 V, 2 A) — Voltage insufficient
VS-2KBP06 (600 V, 2 A) — Voltage exceeds requirement; suitable only if higher voltage margin is required
VS-2KBP08 (800 V, 2 A) — Voltage exceeds requirement; suitable only if higher voltage margin is required
VS-2KBP10 (1 kV, 2 A) — Voltage exceeds requirement; suitable only if higher voltage margin is required
VS-2KBP005 (50 V, 2 A) — Voltage insufficient

Frequently Asked Questions (FAQ)

Q: Can KBP04G replace KBP04M in all applications?

A: KBP04G meets the voltage and current requirements and is an active product. However, the operating temperature range (-65°C to 150°C) does not extend to the KBP04M's -55°C minimum. Verify that your application does not require operation below -65°C. Package compatibility between KBPM and KBP variants must also be confirmed with PCB layout.

Q: Why is KBP204G listed as a substitute if it has 2 A instead of 1.5 A?

A: Higher current rating provides design margin and does not compromise functionality. The 2 A rating ensures the component can handle the 1.5 A requirement with headroom. This is a valid substitution strategy for reliability.

Q: What is the difference between the package designations (KBPM, KBP, 4-ESIP, D-44)?

A: These designations refer to different physical package variants within the 4-SIP family. While all are through-hole mounted, pin spacing and footprint dimensions may differ. Physical compatibility must be verified against your PCB design before substitution.

Q: Is VS-2KBP04 suitable for my application?

A: VS-2KBP04 matches the 400 V / 2 A electrical specification but has a limited operating temperature range (-40°C to 150°C). If your circuit operates below -40°C, this part is not suitable. For applications within this temperature window, it is a valid substitute.

Q: Why should I avoid VS-2KBP02, VS-2KBP06, VS-2KBP08, and VS-2KBP10?

A: These parts have voltage ratings that do not match the KBP04M specification. VS-2KBP02 (200 V) is insufficient. VS-2KBP06, VS-2KBP08, and VS-2KBP10 exceed the 400 V requirement and are suitable only if your design requires higher voltage margin. Using an oversized component introduces unnecessary cost and may affect circuit performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. KBP04G, KBP204G, and VS-2KBP04 are all ROHS3 compliant. The original KBP04M compliance status is not specified in the available data.

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