Equivalent & Substitute Parts for 3N254-E4/45

Part Overview

The 3N254-E4/45 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, 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 identification of equivalent substitute parts essential for ongoing system maintenance and new design implementations where this topology is required.

Key Parameters

Parameter	Value
Diode Type	Single Phase Bridge Rectifier
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max)	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Operating Temperature Range	-55°C ~ 165°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3N254-E4/45 is determined by the following critical parameters:

Diode Type: Single Phase Bridge Rectifier (required match)
Voltage - Peak Reverse (Max): 100 V (required match)
Current - Average Rectified (Io): 2 A (required match or higher)
Mounting Type: Through Hole (required match)
Package / Case: 4-SIP or compatible through-hole bridge rectifier package (required match)
Voltage - Forward (Vf) (Max): 1.1 V or lower (required match or better)
Current - Reverse Leakage @ Vr: 5 µA @ 100 V or lower (required match or better)
Operating Temperature Range: Must encompass or exceed the original specification
RoHS Compliance: ROHS3 Compliant (required match)

The two substitute parts listed below meet these criteria and are classified as active products, providing long-term availability and supply chain stability compared to the obsolete original part.

Parameter Comparison

Parameter	3N254-E4/45 (Original)	KBP01G (Diodes Inc.)	KBP201G (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)	100 V	100 V	100 V
Current - Average Rectified (Io)	2 A	1.5 A	2 A
Voltage - Forward (Vf) (Max)	1.1 V @ 3.14 A	1.1 V @ 1.5 A	1.1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 100 V	5 µA @ 100 V	5 µA @ 100 V
Operating Temperature Range	-55°C ~ 165°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, KBP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

KBP201G (SMC Diode Solutions) is the primary substitute for the 3N254-E4/45. This part maintains identical electrical specifications for voltage rating (100 V), current rating (2 A), forward voltage drop (1.1 V @ 2 A), and reverse leakage current (5 µA @ 100 V). Both parts are ROHS3 compliant and rated for through-hole mounting. The KBP201G is an active product with confirmed inventory availability, ensuring supply chain continuity. The operating temperature range of -55°C ~ 150°C covers the lower end of the original specification but remains suitable for most industrial applications.

KBP01G (Diodes Incorporated) is a secondary substitute option. This part meets the voltage and package requirements but is rated for 1.5 A average rectified current, which is lower than the original 2 A specification. Selection of KBP01G is appropriate only for applications where the actual circuit current demand does not exceed 1.5 A. The KBP01G offers an extended lower operating temperature limit (-65°C) compared to the original part, which may be advantageous in extreme cold environments. This part is also ROHS3 compliant and actively manufactured.

Both substitute parts are available in through-hole packages compatible with standard PCB mounting practices. Physical package dimensions should be verified against the original KBPM footprint before final design implementation.

Frequently Asked Questions (FAQ)

Q: Can KBP01G be used as a direct replacement for 3N254-E4/45?

A: KBP01G is electrically compatible with the 3N254-E4/45 for voltage and leakage specifications. However, the current rating is 1.5 A versus the original 2 A. Use KBP01G only if your circuit operates at or below 1.5 A average rectified current.

Q: What is the difference between KBP01G and KBP201G?

A: Both parts are single-phase bridge rectifiers rated for 100 V. The primary difference is current rating: KBP01G is rated for 1.5 A, while KBP201G is rated for 2 A. KBP201G directly matches the original 3N254-E4/45 current specification. Both maintain identical forward voltage drop and reverse leakage characteristics.

Q: Are the package dimensions identical between KBPM and KBP?

A: Both KBPM and KBP are 4-SIP through-hole packages designed for bridge rectifiers. Physical verification of pin spacing and mounting hole alignment is required before PCB layout finalization. KBP201G uses a 4-ESIP variant; confirm footprint compatibility with your existing design.

Q: Why is the 3N254-E4/45 listed as obsolete?

A: The original part is no longer manufactured by Vishay General Semiconductor. The substitute parts listed are active products from alternative manufacturers that meet or exceed the electrical and mechanical specifications of the obsolete component.

Q: Are both substitute parts RoHS compliant?

A: Yes, both KBP01G and KBP201G are ROHS3 compliant. The KBP201G is REACH Affected, while KBP01G is REACH Unaffected. Verify REACH compliance requirements for your specific application and regulatory jurisdiction.

Q: What is the operating temperature difference between the original and substitutes?

A: The original 3N254-E4/45 operates from -55°C to 165°C. KBP201G operates from -55°C to 150°C, and KBP01G operates from -65°C to 150°C. Both substitutes have a lower maximum temperature limit by 15°C. Confirm that your application does not require operation above 150°C.

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