KBP08M Bridge Rectifier Single Phase 800V 1.5A Equivalent & Substitute Parts

Part Overview

The KBP08M is a single-phase bridge rectifier manufactured by onsemi, rated for 800V peak reverse voltage and 1.5A average rectified current in a 4-SIP KBPM through-hole package. This part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across voltage rating, current capacity, mounting type, and thermal operating range to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	KBP08M Specification
Manufacturer	onsemi
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature	-55°C ~ 165°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the KBP08M are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Voltage - Peak Reverse (Max): 800 V minimum
Current - Average Rectified (Io): 1.5 A minimum
Diode Type: Single Phase
Mounting Type: Through Hole
Technology: Standard

Secondary Compatibility Factors:

Operating temperature range must encompass or exceed the application requirements
Package / Case must be mechanically compatible with through-hole PCB layouts
Reverse leakage current specifications must be acceptable for the circuit design

Parts are classified into two categories:

Category A - Direct Voltage & Current Match (800V, 1.5A or higher): Parts meeting or exceeding both the 800V voltage rating and 1.5A current capacity with active product status.

Category B - Voltage Match with Higher Current Rating (800V, 2A): Parts rated for 800V with current capacity of 2A, providing additional design margin while maintaining voltage compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Vf (Max) @ If	Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status
KBP08M	onsemi	800 V	1.5 A	1 V @ 1 A	5 µA @ 800 V	-55°C ~ 165°C	4-SIP, KBPM	Obsolete
KBP08G	Diodes Incorporated	800 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 800 V	-65°C ~ 150°C	4-SIP, KBP	Active
KBP208G	SMC Diode Solutions	800 V	2 A	1.1 V @ 2 A	5 µA @ 800 V	-55°C ~ 150°C	4-ESIP	Active
VS-2KBP08	Vishay General Semiconductor - Diodes Division	800 V	2 A	1 V @ 1 A	10 µA @ 800 V	-40°C ~ 150°C	4-SIP, D-44	Active

Engineering Selection Recommendations

Primary Recommendation - KBP08G (Diodes Incorporated): The KBP08G is the closest functional equivalent to the KBP08M. It matches the 800V voltage rating and 1.5A current specification exactly. The part is in active production status with RoHS3 compliance. The 4-SIP KBP package is mechanically compatible with through-hole PCB layouts. Operating temperature range of -65°C to 150°C covers most industrial applications, though the upper limit is 15°C lower than the original KBP08M specification. Forward voltage is slightly elevated at 1.1V versus 1V, which is acceptable for standard rectifier applications.

Secondary Recommendation - KBP208G (SMC Diode Solutions): The KBP208G provides 800V voltage rating with increased current capacity of 2A, offering additional design margin. Active product status with RoHS3 compliance. Operating temperature range of -55°C to 150°C matches the lower temperature limit of the KBP08M. The 4-ESIP package differs from the original KBPM, requiring PCB layout verification for mechanical compatibility. This option is suitable when higher current capacity is beneficial for circuit reliability.

Tertiary Recommendation - VS-2KBP08 (Vishay General Semiconductor - Diodes Division): The VS-2KBP08 meets the 800V voltage requirement with 2A current capacity. Active product status with RoHS3 compliance. Forward voltage specification of 1V @ 1A matches the original part. The 4-SIP D-44 package is through-hole compatible. Operating temperature range of -40°C to 150°C has a narrower lower limit compared to the KBP08M. Reverse leakage current is specified at 10µA versus 5µA, which may be relevant for high-impedance circuit applications.

Compliance Considerations: All recommended substitute parts carry RoHS3 compliance status, suitable for applications requiring environmental compliance. The KBP08M and KBP208G are REACH Affected or Unaffected; verify REACH compliance requirements for your specific application jurisdiction.

Frequently Asked Questions (FAQ)

Q: Can KBP08G be used as a direct replacement for KBP08M? A: Yes. The KBP08G matches the critical electrical specifications: 800V peak reverse voltage, 1.5A average rectified current, and single-phase bridge rectifier topology. Both use through-hole mounting. The 4-SIP KBP package is mechanically compatible with KBPM footprints. Verify PCB layout compatibility before implementation.

Q: What is the difference between KBP08G and KBP208G? A: The primary difference is current rating: KBP08G is rated for 1.5A while KBP208G is rated for 2A. Both maintain 800V voltage rating. KBP208G uses a 4-ESIP package instead of 4-SIP, requiring PCB layout verification. KBP208G provides higher current capacity for applications requiring additional design margin.

Q: Why is the operating temperature range different between KBP08M and substitute parts? A: The KBP08M specifies -55°C to 165°C, while active substitutes typically specify -40°C to 150°C or -65°C to 150°C. These differences reflect current manufacturing standards and thermal design of active products. Verify that the substitute part's operating range meets your application's thermal requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. All recommended substitute parts carry RoHS3 compliance status. The KBP08M is classified as RoHS status not specified due to its obsolete status. Verify REACH compliance status for your specific application and regional requirements.

Q: What does the package designation mean (KBPM vs KBP vs D-44)? A: These are supplier-specific package designations for the same 4-SIP through-hole form factor. KBPM is onsemi's designation, KBP is Diodes Incorporated's designation, and D-44 is Vishay's designation. All are mechanically compatible with standard through-hole PCB layouts, though specific footprint dimensions should be verified against datasheet specifications.

Q: Can I use VS-2KBP08 if my circuit requires lower reverse leakage current? A: The VS-2KBP08 specifies 10µA reverse leakage at 800V, compared to 5µA for the KBP08M and KBP08G. If your circuit design requires leakage current below 10µA, use KBP08G or KBP208G instead. Verify leakage current requirements in your circuit analysis.

Q: What inventory availability should I consider? A: KBP208G has the highest inventory (19,035 pcs), followed by VS-2KBP08 (1,836 pcs), KBP08G (1,425 pcs), and VS-2KBP06 (2,553 pcs). Inventory levels may affect lead time and cost considerations for production planning.

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