KBP04M-E4/51 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBP04M-E4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system maintenance and new design implementations. The through-hole KBPM package configuration supports standard PCB assembly processes for industrial and power conversion applications.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max)	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 400 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

Substitution eligibility for the KBP04M-E4/51 is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Diode Type: Must be Single Phase
Mounting Type: Must be Through Hole
Package compatibility: Physical form factor must support PCB integration

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional equivalence within the specified operating conditions.

Parameter Comparison

Parameter	KBP04M-E4/51 (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)	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 @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 150°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
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 KBP04G and KBP204G meet the electrical requirements for substitution. The KBP04G from Diodes Incorporated provides a direct current rating match at 1.5 A with active product status and ROHS3 compliance. The KBP204G from SMC Diode Solutions offers increased current capacity at 2 A, providing design margin for applications requiring higher current handling, though it carries REACH Affected status.

For applications requiring exact current specification matching, the KBP04G is the primary substitute. For applications where increased current capacity is beneficial, the KBP204G is suitable provided REACH compliance requirements are satisfied. Both parts maintain identical voltage ratings, reverse leakage characteristics, and moisture sensitivity levels as the original KBP04M-E4/51.

Frequently Asked Questions (FAQ)

Q: Can KBP04G directly replace KBP04M-E4/51 in existing designs?

A: Yes. The KBP04G maintains identical voltage and current ratings, reverse leakage specifications, and through-hole mounting configuration. Package form factors differ slightly (KBP versus KBPM), but both are 4-SIP configurations suitable for standard PCB layouts.

Q: What is the difference between KBP04G and KBP204G?

A: The primary difference is current rating. KBP04G is rated for 1.5 A average rectified current, matching the original part. KBP204G is rated for 2 A, providing additional current capacity. Both maintain 400 V peak reverse voltage and identical reverse leakage characteristics.

Q: Are there temperature range considerations when substituting?

A: The KBP04G extends the lower operating temperature to -65°C compared to the original -55°C specification. The KBP204G maintains the original -55°C lower limit. Both support the 150°C upper limit. Selection depends on application temperature requirements.

Q: Do package differences affect PCB compatibility?

A: Both substitute parts use 4-SIP through-hole packages compatible with standard PCB footprints designed for single-phase bridge rectifiers. Physical dimensions may vary slightly between KBPM, KBP, and 4-ESIP packages; verify footprint compatibility with PCB design documentation.

Q: What compliance certifications apply to these substitutes?

A: All three parts are ROHS3 compliant with MSL rating of 1 (Unlimited). KBP04G and KBP04M-E4/51 are REACH Unaffected. KBP204G is REACH Affected. Regulatory requirements for your application determine which substitute is appropriate.

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