3KBP08M-E4/51 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The 3KBP08M-E4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V peak reverse voltage and 3 A average rectified current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is housed in a 4-SIP KBPM package and is suitable for through-hole mounting applications requiring standard bridge rectification at 800 V.

Key Parameters

Parameter	Value
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 3 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 3KBP08M-E4/51 are selected based on the following critical parameters that determine functional compatibility:

Voltage - Peak Reverse (Max): Must equal or exceed 800 V
Diode Type: Single Phase bridge rectifier configuration
Mounting Type: Through Hole
Package Category: 4-pin SIP variants (KBPM, KBP, 4-ESIP)
Technology: Standard bridge rectifier technology
RoHS Compliance: ROHS3 Compliant

The substitute parts identified (KBP08G and KBP208G) maintain the 800 V voltage rating and through-hole mounting requirement. Current ratings vary (1.5 A and 2 A respectively), which affects application suitability based on circuit requirements. Both substitutes are active products with current manufacturing availability, addressing the obsolescence of the original part.

Parameter Comparison

Parameter	3KBP08M-E4/51 (Main)	KBP08G (Substitute)	KBP208G (Substitute)
Manufacturer	Vishay General Semiconductor	Diodes Incorporated	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Voltage - Peak Reverse (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	3 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.05 V @ 3 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 ~ 150°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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

Both KBP08G and KBP208G are active products suitable for replacing the obsolete 3KBP08M-E4/51. Selection between these substitutes depends on circuit current requirements:

KBP08G (Diodes Incorporated): Rated for 1.5 A average rectified current. This substitute is appropriate for applications where the circuit current demand does not exceed 1.5 A. The part maintains ROHS3 compliance and REACH Unaffected status. Operating temperature range extends to -65°C, providing broader low-temperature capability than the original part.

KBP208G (SMC Diode Solutions): Rated for 2 A average rectified current. This substitute accommodates higher current demands up to 2 A while maintaining the 800 V voltage rating. The part is ROHS3 compliant but carries REACH Affected status. Operating temperature range matches the original specification at -55°C to 150°C.

Both substitutes maintain identical reverse leakage characteristics (5 µA @ 800 V) and forward voltage performance within acceptable engineering tolerances. Package variants (KBP vs. 4-ESIP) require PCB layout verification for mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can KBP08G replace 3KBP08M-E4/51 in all applications?

A: KBP08G is suitable only for applications where circuit current does not exceed 1.5 A. The original part is rated for 3 A, so KBP08G cannot be used in circuits requiring the full 3 A capacity. Verify actual circuit current requirements before substitution.

Q: What is the difference between KBP08G and KBP208G?

A: The primary difference is current rating. KBP08G is rated for 1.5 A, while KBP208G is rated for 2 A. Both maintain 800 V voltage rating and through-hole mounting. KBP208G carries REACH Affected status, while KBP08G is REACH Unaffected. Package form factors differ (KBP vs. 4-ESIP).

Q: Are the package dimensions compatible between KBPM, KBP, and 4-ESIP?

A: All three packages are 4-pin SIP variants designed for through-hole mounting. However, specific pin spacing and body dimensions may differ. PCB layout and footprint verification is required before substitution to ensure mechanical compatibility.

Q: Do both substitutes meet RoHS requirements?

A: Yes. Both KBP08G and KBP208G are ROHS3 Compliant. The original 3KBP08M-E4/51 is also ROHS3 Compliant.

Q: Which substitute should I choose if my circuit requires 3 A?

A: Neither substitute provides the full 3 A rating of the original part. KBP208G at 2 A is the closest available option. If 3 A capacity is mandatory, alternative bridge rectifier models outside this substitute group must be evaluated.

Q: What is the impact of REACH Affected status on KBP208G?

A: REACH Affected status indicates the part contains substances of concern under REACH regulations. This affects supply chain compliance and documentation requirements in certain markets. Verify REACH compliance requirements for your specific application and region before selecting KBP208G.

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