PB34-BP Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The PB34-BP is a single-phase bridge rectifier manufactured by Micro Commercial Co, rated for 400 V peak reverse voltage with 3 A average rectified current. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The through-hole PB-3 package configuration requires direct mechanical and electrical compatibility for seamless integration into existing circuit designs.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	3 A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 1.5 A
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole
Package / Case	4-Square, PB-3

Substitute Part Grouping Explanation

Substitution of the PB34-BP is determined by strict equivalence across the following critical parameters:

Voltage Rating: Peak reverse voltage must equal or exceed 400 V
Current Rating: Average rectified current must equal or exceed 3 A
Diode Configuration: Single-phase bridge rectifier topology
Package Type: 4-Square through-hole configuration (PB-3 or mechanically equivalent)
Forward Voltage Characteristics: Maximum forward voltage drop at rated current
Reverse Leakage: Maximum reverse leakage current at rated voltage
Temperature Range: Operating temperature compatibility with application requirements

The BR34 manufactured by GeneSiC Semiconductor meets all substitution criteria for the PB34-BP within these defined electrical and mechanical parameters.

Parameter Comparison

Parameter	PB34-BP (Micro Commercial Co)	BR34 (GeneSiC Semiconductor)	Compatibility
Diode Type	Single Phase	Single Phase	Equivalent
Voltage - Peak Reverse (Max)	400 V	400 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	BR34 Superior
Current - Reverse Leakage @ Vr	10 µA @ 400 V	10 µA @ 400 V	Equivalent
Operating Temperature Range	-55°C ~ 125°C	-65°C ~ 125°C (TJ)	BR34 Extended
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	4-Square, PB-3	4-Square, BR-3	Mechanically Compatible
Product Status	Obsolete	Active	BR34 Current
RoHS Status	ROHS3 Compliant	RoHS Compliant	Both Compliant

Engineering Selection Recommendations

The BR34 is a direct substitute for the PB34-BP based on electrical parameter equivalence and mechanical compatibility. The BR34 offers the following advantages:

Active Product Status: The BR34 is currently in active production, ensuring long-term availability and supply chain continuity compared to the obsolete PB34-BP.
Regulatory Compliance: Both components meet RoHS requirements. The BR34 carries RoHS Compliance certification with MSL 1 (Unlimited), indicating superior moisture handling characteristics.
Enhanced Performance: The BR34 demonstrates lower forward voltage drop (1 V vs. 1.2 V at 1.5 A), resulting in reduced power dissipation and improved thermal efficiency.
Extended Temperature Range: The BR34 operates across -65°C to 125°C, providing broader environmental compatibility than the PB34-BP (-55°C to 125°C).
Mechanical Compatibility: Both components utilize 4-Square through-hole packages (PB-3 and BR-3 respectively), ensuring direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the BR34 be used as a direct replacement for the PB34-BP without circuit modifications?

A: Yes. The BR34 meets all critical electrical parameters (400 V peak reverse voltage, 3 A average rectified current, 10 µA reverse leakage) and uses a mechanically compatible 4-Square through-hole package. No circuit design changes are required.

Q: What is the significance of the lower forward voltage drop in the BR34?

A: The BR34 exhibits 1 V forward voltage drop compared to 1.2 V in the PB34-BP at 1.5 A. This 0.2 V reduction decreases power dissipation and heat generation, improving overall circuit efficiency and thermal performance.

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

A: Both components are RoHS compliant. The BR34 carries RoHS Compliance with MSL 1 (Unlimited), indicating superior moisture sensitivity performance. Both share the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: Does the extended temperature range of the BR34 affect its suitability for standard applications?

A: The BR34's extended operating range (-65°C to 125°C versus -55°C to 125°C) provides additional environmental margin without introducing incompatibility. It is suitable for applications requiring either standard or extended temperature operation.

Q: Are the PB-3 and BR-3 packages physically interchangeable?

A: Yes. Both packages are 4-Square through-hole configurations with mechanically compatible pin layouts, allowing direct PCB footprint compatibility without layout redesign.

Q: What inventory considerations should be evaluated when transitioning from PB34-BP to BR34?

A: The PB34-BP has 860 pieces in stock (obsolete status), while the BR34 has 18,700 pieces available (active production). For new designs or long-term production, the BR34 is recommended due to active manufacturing status and superior supply availability.

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