KBP08M-E4/51 Equivalent & Substitute Parts

Part Overview

The KBP08M-E4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Bridge rectifiers in this voltage and current class are fundamental in AC-to-DC conversion applications across industrial and consumer electronics.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max)	1 V @ 1 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

Substitute Part Grouping Explanation

Substitution eligibility for the KBP08M-E4/51 is determined by the following critical parameters:

Peak reverse voltage rating of 800 V (minimum requirement)
Single-phase bridge rectifier configuration
Through-hole mounting technology
Standard rectifier technology classification
Reverse leakage current of 5 µA @ 800 V

Two substitute parts meet these core criteria: the KBP08G (Diodes Incorporated) and the KBP208G (SMC Diode Solutions). Both maintain the 800 V voltage rating and through-hole mounting requirement. The KBP08G provides a direct current rating match at 1.5 A, while the KBP208G offers increased current capacity at 2 A, suitable for applications requiring higher current handling.

Parameter Comparison

Parameter	KBP08M-E4/51 (Main)	KBP08G (Substitute)	KBP208G (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Diodes Incorporated	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Type	Single Phase	Single Phase	Single Phase
Voltage - Peak Reverse (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max)	1 V @ 1 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 (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

The KBP08G (Diodes Incorporated) is the primary substitute for direct replacement of the KBP08M-E4/51. Both components share identical voltage and current ratings, maintain ROHS3 compliance, and feature unlimited moisture sensitivity classification. The KBP08G is currently in active production status with established supply availability. The extended operating temperature range of the KBP08G (-65°C minimum versus -55°C) provides additional thermal margin for demanding applications.

The KBP208G (SMC Diode Solutions) serves as an alternative for applications where increased current capacity is acceptable. With a 2 A average rectified current rating compared to the 1.5 A specification of the original part, the KBP208G accommodates higher load requirements while maintaining the 800 V voltage rating. However, the KBP208G carries REACH Affected status, requiring compliance verification for regulated markets. Package configuration differences (4-ESIP versus 4-SIP, KBPM) necessitate PCB layout verification prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the KBP08G directly replace the KBP08M-E4/51 without PCB modifications?

A: The KBP08G maintains identical electrical ratings (800 V, 1.5 A) and through-hole mounting technology. Both use 4-SIP package configurations, though the specific package designations differ (KBPM versus KBP). Physical pin compatibility should be verified against PCB footprint documentation before implementation.

Q: What is the primary difference between the KBP08G and KBP208G substitutes?

A: The KBP208G provides 2 A average rectified current capacity versus the 1.5 A rating of both the KBP08M-E4/51 and KBP08G. All three components maintain the 800 V peak reverse voltage specification. The KBP208G uses a 4-ESIP package configuration, requiring PCB layout verification.

Q: Are there compliance considerations when selecting between substitute parts?

A: Both substitute parts maintain ROHS3 compliance. The KBP08G carries REACH Unaffected status, identical to the original part. The KBP208G is REACH Affected, requiring compliance assessment for applications in regulated markets or regions with REACH requirements.

Q: How do forward voltage characteristics compare across these parts?

A: The KBP08M-E4/51 specifies 1 V maximum forward voltage at 1 A. Both substitute parts specify 1.1 V maximum forward voltage at their respective rated currents (1.5 A for KBP08G, 2 A for KBP208G). This 0.1 V difference represents a minor increase in forward voltage drop and should be evaluated for thermal management in power-sensitive applications.

Q: What is the temperature operating range difference between substitutes?

A: The KBP08G extends the minimum operating temperature to -65°C compared to -55°C for both the KBP08M-E4/51 and KBP208G. All three components maintain a maximum operating temperature of 150°C. The extended lower temperature range of the KBP08G may provide advantages in cold-environment applications.

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