KBP04M-M4/51 Equivalent & Substitute Parts

Part Overview

The KBP04M-M4/51 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 functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. The part is housed in a 4-SIP KBPM package and is suitable for through-hole mounting applications requiring standard bridge rectification at moderate voltage and current levels.

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 of the KBP04M-M4/51 is determined by strict equivalence across the following critical parameters:

Diode Type: Single Phase bridge rectifier configuration
Voltage Rating: 400 V peak reverse voltage (Vrrm)
Current Rating: 1.5 A average rectified current (Io)
Technology: Standard rectifier technology
Mounting: Through-hole package suitable for PCB insertion
Regulatory Compliance: ROHS3 compliance and REACH unaffected status

The KBP04G from Diodes Incorporated meets all substitution criteria. Both parts share the same base product number (KBP04), identical voltage and current ratings, equivalent reverse leakage characteristics, and compatible through-hole mounting configurations. Package designation differences (KBPM vs. KBP) reflect manufacturer-specific nomenclature for functionally identical 4-SIP form factors.

Parameter Comparison

Parameter	KBP04M-M4/51 (Vishay)	KBP04G (Diodes Inc.)
Diode Type	Single Phase	Single Phase
Technology	Standard	Standard
Voltage - Peak Reverse (Max)	400 V	400 V
Current - Average Rectified (Io)	1.5 A	1.5 A
Voltage - Forward (Vf) (Max)	1 V @ 1 A	1.1 V @ 1.5 A
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The KBP04G is a direct functional equivalent for the obsolete KBP04M-M4/51. Both components maintain identical electrical specifications for voltage and current ratings, reverse leakage characteristics, and thermal operating ranges. The KBP04G offers the advantage of active product status with confirmed inventory availability (2264 pcs), ensuring supply chain continuity for replacement and new applications.

Both parts satisfy ROHS3 compliance requirements and carry equivalent regulatory certifications (REACH unaffected, ECCN EAR99, HTSUS 8541.10.0080). The KBP04G provides an extended lower operating temperature limit (-65°C vs. -55°C), which represents an operational advantage in cold-environment applications.

Forward voltage characteristics show a minor difference (1 V @ 1 A for KBP04M-M4/51 vs. 1.1 V @ 1.5 A for KBP04G), which falls within acceptable tolerance for standard bridge rectifier applications and does not preclude direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the KBP04G directly replace the KBP04M-M4/51 in existing designs?

A: Yes. Both components are single-phase bridge rectifiers with identical 400 V / 1.5 A ratings, equivalent reverse leakage, and compatible through-hole 4-SIP packages. Electrical performance is functionally equivalent for standard rectification applications.

Q: What is the significance of the package designation difference (KBPM vs. KBP)?

A: KBPM and KBP are manufacturer-specific nomenclature for the same 4-SIP form factor. Both designations refer to identical physical package dimensions and pin configurations suitable for through-hole PCB mounting.

Q: Does the forward voltage difference affect substitution suitability?

A: No. The forward voltage specifications (1 V @ 1 A vs. 1.1 V @ 1.5 A) represent measurements at different test conditions and fall within normal tolerance ranges for standard bridge rectifier technology. This difference does not impact functional substitution.

Q: Why is the KBP04M-M4/51 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Vishay. The KBP04G from Diodes Incorporated provides continued availability of equivalent functionality through an active product line.

Q: Are there any compliance or certification differences between these parts?

A: No. Both components carry identical ROHS3 compliance, REACH unaffected status, and equivalent trade classification codes (ECCN EAR99, HTSUS 8541.10.0080).

Q: What is the moisture sensitivity level, and does it affect handling?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling procedures for electronic components apply without special moisture control requirements.

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