3N249-M4/51 Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The 3N249-M4/51 is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -55°C to 150°C and is housed in a 4-SIP KBPM package for through-hole mounting applications.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBPM
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3N249-M4/51 is determined by the following critical parameters:

Voltage - Peak Reverse (Max): Must equal 400 V
Diode Type: Must be Single Phase
Technology: Must be Standard
Current - Average Rectified (Io): Must meet or exceed 1.5 A
Mounting Type: Must be Through Hole
Operating Temperature Range: Must encompass or exceed -55°C to 150°C
RoHS Status: Must maintain ROHS3 Compliance

Two substitute parts meet these criteria with varying degrees of parameter alignment. The KBP04G maintains identical electrical specifications with extended low-temperature performance. The KBP204G provides higher current capacity at 2 A, suitable for applications requiring additional current margin.

Parameter Comparison

Parameter	3N249-M4/51	KBP04G	KBP204G
Manufacturer	Vishay General Semiconductor - Diodes Division	Diodes Incorporated	SMC Diode Solutions
Product Status	Obsolete	Active	Active
Diode Type	Single Phase	Single Phase	Single Phase
Voltage - Peak Reverse (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 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	-55°C ~ 150°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

Both KBP04G and KBP204G are active products with ROHS3 compliance, providing long-term availability compared to the obsolete 3N249-M4/51.

The KBP04G from Diodes Incorporated is the direct functional equivalent, matching the 1.5 A current rating and 400 V voltage specification. It maintains REACH Unaffected status and extends the low-temperature operating range to -65°C. Package compatibility requires verification due to the transition from KBPM to KBP form factor.

The KBP204G from SMC Diode Solutions provides increased current capacity at 2 A while maintaining the 400 V voltage rating. This part is suitable for applications requiring additional current margin. The REACH Affected status requires compliance verification in regulated markets. Package transition from KBPM to 4-ESIP requires mechanical validation.

Frequently Asked Questions (FAQ)

Q: Can KBP04G directly replace 3N249-M4/51 without circuit modification?

A: KBP04G meets all electrical specifications for the 3N249-M4/51. Package form factor differs (KBP versus KBPM), requiring PCB layout verification for through-hole mounting compatibility.

Q: What is the primary difference between KBP04G and KBP204G?

A: KBP04G maintains the 1.5 A current rating identical to the original part. KBP204G provides 2 A average rectified current, offering higher current capacity for the same 400 V voltage rating.

Q: Are both substitute parts suitable for -55°C operation?

A: KBP04G operates from -65°C to 150°C, exceeding the original -55°C lower limit. KBP204G operates from -55°C to 150°C, matching the original temperature range.

Q: What compliance considerations apply to these substitutes?

A: Both KBP04G and KBP204G are ROHS3 compliant. KBP04G maintains REACH Unaffected status. KBP204G is REACH Affected, requiring compliance verification for applications in regulated markets.

Q: Do package differences affect electrical performance?

A: Package differences (KBPM, KBP, 4-ESIP) do not affect electrical performance. Mechanical compatibility with PCB footprints and mounting hardware must be verified during design transition.

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