3N254 Bridge Rectifier Single Phase 100V 2A - Equivalent & Substitute Parts

Part Overview

The 3N254 is a single-phase bridge rectifier manufactured by onsemi, rated for 100 V peak reverse voltage and 2 A average rectified current in a 4-SIP KBPM through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Bridge rectifiers in this voltage and current class are widely used in power supply circuits, battery chargers, and AC-to-DC conversion applications where standard rectification technology is required.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM

Substitute Part Grouping Explanation

Substitution for the 3N254 is determined by the following critical parameters:

Voltage Rating: Peak reverse voltage must be 100 V or higher to maintain circuit protection margins
Current Rating: Average rectified current must be 1.5 A or higher to support the 2 A requirement
Diode Type: Single-phase bridge rectifier only
Technology: Standard rectifier technology
Mounting Type: Through-hole configuration required for PCB compatibility
Package Compatibility: Physical package must fit existing board layouts

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (100 V Rating, 2 A Current) These parts match the 3N254 voltage and current specifications exactly, ensuring drop-in compatibility with minimal circuit impact.

Category B - Higher Voltage Alternatives (200 V and Above) These parts exceed the 100 V rating but maintain 2 A current capacity. They are suitable for applications where higher voltage headroom is beneficial, though they are not direct replacements for the original 100 V specification.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Product Status
3N254	onsemi	100 V	2 A	1.1 V @ 3.14 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, KBPM	Obsolete
KBP01G	Diodes Incorporated	100 V	1.5 A	1.1 V @ 1.5 A	5 µA @ 100 V	-65°C ~ 150°C	4-SIP, KBP	Active
KBP201G	SMC Diode Solutions	100 V	2 A	1.1 V @ 2 A	5 µA @ 100 V	-55°C ~ 150°C	4-ESIP	Active
VS-2KBP005	Vishay General Semiconductor - Diodes Division	50 V	2 A	1 V @ 1 A	10 µA @ 50 V	-40°C ~ 150°C	4-SIP, D-44	Active
VS-2KBP02	Vishay General Semiconductor - Diodes Division	200 V	2 A	1 V @ 1 A	10 µA @ 200 V	-40°C ~ 150°C	4-SIP, D-44	Active
VS-2KBP04	Vishay General Semiconductor - Diodes Division	400 V	2 A	1 V @ 1 A	10 µA @ 400 V	-40°C ~ 150°C	4-SIP, D-44	Active
VS-2KBP06	Vishay General Semiconductor - Diodes Division	600 V	2 A	1 V @ 1 A	10 µA @ 600 V	-40°C ~ 150°C	4-SIP, D-44	Active
VS-2KBP08	Vishay General Semiconductor - Diodes Division	800 V	2 A	1 V @ 1 A	10 µA @ 800 V	-40°C ~ 150°C	4-SIP, D-44	Active
VS-2KBP10	Vishay General Semiconductor - Diodes Division	1 kV	2 A	1 V @ 1 A	10 µA @ 1000 V	-40°C ~ 150°C	4-SIP, D-44	Active

Engineering Selection Recommendations

Primary Substitute: KBP201G

KBP201G from SMC Diode Solutions is the most direct substitute for the 3N254. It matches the 100 V peak reverse voltage and 2 A average rectified current specifications exactly. The part is in active production status, ensuring long-term availability. KBP201G carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The 4-ESIP package is mechanically compatible with standard through-hole PCB layouts, though pin spacing should be verified against the original KBPM footprint during board redesign.

Secondary Substitute: KBP01G

KBP01G from Diodes Incorporated operates at the same 100 V voltage rating but with a reduced current rating of 1.5 A. This part is suitable only for applications where the circuit current demand does not exceed 1.5 A. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the 3N254. KBP01G is in active production and carries ROHS3 compliance.

Higher Voltage Alternatives: VS-2KBP Series

The Vishay VS-2KBP series (VS-2KBP02, VS-2KBP04, VS-2KBP06, VS-2KBP08, VS-2KBP10) maintains the 2 A current rating across voltage ratings of 200 V, 400 V, 600 V, 800 V, and 1 kV respectively. These parts are suitable for circuits where higher voltage headroom is required or where a single rectifier design must support multiple voltage applications. All VS-2KBP parts are in active production with ROHS3 compliance. The D-44 package is mechanically compatible with through-hole mounting.

Not Recommended: VS-2KBP005

VS-2KBP005 operates at only 50 V peak reverse voltage, which is below the 3N254 specification. This part does not provide adequate voltage protection for 100 V circuits and is not a suitable substitute.

Frequently Asked Questions (FAQ)

Q: Can KBP01G replace the 3N254 in all applications?

A: KBP01G is suitable only for applications where the average rectified current does not exceed 1.5 A. If your circuit requires the full 2 A capacity of the 3N254, KBP01G will not provide adequate current handling. For 2 A applications, use KBP201G or the VS-2KBP series.

Q: What is the difference between the KBPM and KBP packages?

A: Both are 4-SIP through-hole packages used for single-phase bridge rectifiers. The KBPM is the original onsemi package designation, while KBP is the industry-standard designation used by multiple manufacturers. Physical pin spacing and PCB footprints are compatible, but board layout files should be updated to reflect the new package designation.

Q: Can I use a higher voltage-rated part like VS-2KBP06 (600 V) in place of the 3N254 (100 V)?

A: Yes. Higher voltage-rated bridge rectifiers are electrically compatible with lower voltage circuits. The 600 V rating provides additional voltage margin and protection. However, higher voltage parts typically have slightly different forward voltage characteristics and reverse leakage specifications. Verify that these differences do not impact circuit performance, particularly in precision rectification applications.

Q: Are all substitute parts RoHS compliant?

A: KBP201G and KBP01G carry ROHS3 compliance certification. The VS-2KBP series parts also carry ROHS3 compliance. The original 3N254 is not RoHS compliant. If your application requires RoHS compliance, all listed substitutes meet this requirement.

Q: What is the impact of using a substitute part with different forward voltage characteristics?

A: The 3N254 has a forward voltage of 1.1 V @ 3.14 A, while most substitute parts specify 1.1 V @ lower current levels or 1 V @ 1 A. In low-current applications, forward voltage differences are negligible. In high-current applications near the 2 A rating, verify that the substitute part's forward voltage specification does not cause excessive power dissipation or thermal issues in your specific circuit design.

Q: Is the VS-2KBP005 (50 V) suitable as a substitute?

A: No. The VS-2KBP005 operates at 50 V peak reverse voltage, which is below the 3N254 specification of 100 V. Using an under-rated voltage component creates risk of component failure and circuit damage. Do not use VS-2KBP005 as a substitute for the 3N254.

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