PB31-BP Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The PB31-BP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 100 V peak reverse voltage and 3 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and procurement planning. The through-hole PB-3 package configuration and standard rectification technology establish the baseline for compatible alternatives.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1.5 A
Current - Reverse Leakage @ Vr	10 µA @ 100 V
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	4-Square, PB-3
Technology	Standard

Substitute Part Grouping Explanation

Substitution of the PB31-BP is determined by strict equivalence across the following critical parameters:

Voltage Rating: Peak reverse voltage must equal or exceed 100 V
Current Rating: Average rectified current must equal or exceed 3 A
Diode Configuration: Single-phase bridge rectifier topology
Package Type: Through-hole mounting in 4-square configuration
Forward Voltage Characteristics: Maximum forward voltage drop at rated current
Reverse Leakage: Maximum reverse leakage current at rated voltage
Operating Temperature: Functional temperature range must encompass application requirements
Technology Class: Standard rectification technology

The BR31 manufactured by GeneSiC Semiconductor meets all substitution criteria for the PB31-BP within these defined parameters.

Parameter Comparison

Parameter	PB31-BP (Micro Commercial Co)	BR31 (GeneSiC Semiconductor)	Compatibility
Diode Type	Single Phase	Single Phase	Equivalent
Voltage - Peak Reverse (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1.5 A	1 V @ 1.5 A	BR31 Superior
Current - Reverse Leakage @ Vr	10 µA @ 100 V	10 µA @ 100 V	Equivalent
Operating Temperature Range	-55°C ~ 125°C	-65°C ~ 125°C (TJ)	BR31 Extended
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	4-Square, PB-3	4-Square, BR-3	Equivalent Form Factor
Technology	Standard	Standard	Equivalent
Product Status	Obsolete	Active	BR31 Currently Supported
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both Compliant

Engineering Selection Recommendations

The BR31 manufactured by GeneSiC Semiconductor is a direct substitute for the obsolete PB31-BP. Both components share identical electrical ratings for voltage, current, and leakage specifications. The BR31 offers measurable advantages: reduced forward voltage drop (1 V versus 1.2 V at 1.5 A) and extended lower operating temperature limit (-65°C versus -55°C). Both components maintain RoHS compliance and are suitable for applications requiring standard single-phase bridge rectification at 100 V / 3 A.

The BR31 is currently in active production status with confirmed inventory availability, eliminating supply chain risk associated with the obsolete PB31-BP designation.

Frequently Asked Questions (FAQ)

Q: Can the BR31 be used as a direct replacement for the PB31-BP in existing designs?

A: Yes. The BR31 meets all electrical and mechanical substitution criteria. Both components are single-phase bridge rectifiers with identical 100 V / 3 A ratings, through-hole mounting, and 4-square package form factors. The BR31 offers improved forward voltage characteristics and extended temperature range.

Q: Are there package compatibility concerns between PB-3 and BR-3 designations?

A: Both packages are 4-square through-hole configurations with equivalent mechanical form factors suitable for standard PCB mounting. Pin spacing and hole diameter compatibility must be verified against specific PCB layout documentation.

Q: What is the significance of the BR31 having lower forward voltage drop?

A: The BR31 exhibits 1 V forward voltage drop compared to 1.2 V for the PB31-BP at 1.5 A. This 0.2 V reduction results in lower power dissipation and heat generation during operation, which may improve thermal performance in current-limited applications.

Q: Does the extended temperature range of the BR31 affect substitution suitability?

A: The BR31 operating range of -65°C to 125°C encompasses the PB31-BP range of -55°C to 125°C. Extended temperature capability does not compromise substitution; it provides additional operational margin for applications requiring lower temperature performance.

Q: Are both components RoHS compliant?

A: Yes. The PB31-BP is ROHS3 compliant and the BR31 is RoHS compliant. Both meet regulatory requirements for hazardous substance restrictions.

Q: What inventory status should influence component selection?

A: The PB31-BP is obsolete with 1083 pieces in stock. The BR31 is active production with 956 pieces available. For new designs and long-term procurement, the BR31 is the recommended selection due to active manufacturer support and ongoing availability.

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