3N256-E4/45 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The 3N256-E4/45 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V peak reverse voltage and 2 A average rectified current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part is housed in a 4-SIP KBPM package and is suitable for through-hole mounting applications requiring standard bridge rectification at 400 V operation.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A
Current - Reverse Leakage @ Vr	5 µA @ 400 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

Substitute parts for the 3N256-E4/45 are qualified based on the following critical parameters:

Voltage - Peak Reverse (Max): 400 V minimum
Diode Type: Single Phase
Technology: Standard
Mounting Type: Through Hole
Current - Average Rectified (Io): Equal to or greater than 2 A
Voltage - Forward (Vf) (Max): 1.1 V or lower
Current - Reverse Leakage @ Vr: 5 µA @ 400 V or lower
RoHS Status: ROHS3 Compliant

Two active substitute parts meet these electrical and mechanical criteria: KBP04G (Diodes Incorporated) and KBP204G (SMC Diode Solutions). Both maintain the 400 V peak reverse voltage rating, through-hole mounting configuration, and standard bridge rectifier topology required for direct substitution.

Parameter Comparison

Parameter	3N256-E4/45 (Main)	KBP04G (Substitute)	KBP204G (Substitute)
Manufacturer	Vishay General Semiconductor - Diodes Division	Diodes Incorporated	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
Voltage - Peak Reverse (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	2 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3.14 A	1.1 V @ 1.5 A	1.1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 165°C (TJ)	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, KBPM	4-SIP, KBP	4-ESIP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

KBP204G (SMC Diode Solutions) is the primary substitute for the 3N256-E4/45. This part maintains identical electrical specifications: 400 V peak reverse voltage, 2 A average rectified current, and 1.1 V forward voltage. Both components are ROHS3 compliant and feature unlimited moisture sensitivity levels. The KBP204G is currently in active production status with 1,230 units in stock. Package differences exist (4-ESIP versus 4-SIP KBPM), requiring mechanical verification for board layout compatibility. REACH status differs; KBP204G is REACH Affected while the original part is REACH Unaffected.

KBP04G (Diodes Incorporated) serves as a secondary substitute when current rating reduction is acceptable. This part operates at 1.5 A average rectified current, below the original 2 A specification. KBP04G maintains the 400 V voltage rating and 1.1 V forward voltage characteristic. It is ROHS3 compliant, REACH Unaffected, and currently in active production with 2,264 units available. The operating temperature range extends to -65°C, providing wider low-temperature capability than the original part.

Frequently Asked Questions (FAQ)

Q: Can KBP04G directly replace the 3N256-E4/45 in all applications?

A: KBP04G is electrically compatible for voltage and forward characteristics but operates at 1.5 A average rectified current versus the original 2 A rating. Applications requiring the full 2 A capacity must use KBP204G instead.

Q: What are the package differences between the substitute parts?

A: The 3N256-E4/45 uses a 4-SIP KBPM package. KBP04G uses a 4-SIP KBP package, while KBP204G uses a 4-ESIP package. Physical dimensions and pin spacing may differ; board layout verification is required before implementation.

Q: Are both substitute parts RoHS compliant?

A: Yes, both KBP04G and KBP204G are ROHS3 compliant. However, KBP204G is REACH Affected while KBP04G is REACH Unaffected. Regulatory requirements for your application region determine which part is appropriate.

Q: What is the temperature operating range difference?

A: The original 3N256-E4/45 operates from -55°C to 165°C. KBP04G extends the lower limit to -65°C but reduces the upper limit to 150°C. KBP204G maintains -55°C to 150°C. High-temperature applications above 150°C cannot use either substitute.

Q: Which substitute part should I select for new designs?

A: For applications requiring 2 A capacity, select KBP204G. For applications tolerating 1.5 A capacity with extended low-temperature performance, select KBP04G. Verify package compatibility with your PCB layout before final selection.

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