KBU4M Bridge Rectifier Diode Equivalent & Substitute Parts

Part Overview

The KBU4M is a single-phase bridge rectifier diode manufactured by onsemi, rated for 1 kV peak reverse voltage and 4 A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The KBU4M features a through-hole 4-SIP package configuration suitable for standard power supply and rectification applications.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	1 kV
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 4 A
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBU
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the KBU4M is determined by the following critical parameters:

Voltage Rating: Peak reverse voltage must be 1 kV or higher
Current Rating: Average rectified current must meet or exceed 4 A
Diode Type: Single-phase bridge rectifier configuration
Mounting Type: Through-hole package required for PCB compatibility
Operating Temperature: Must support -55°C to 150°C range or equivalent
Package Family: GBU or KBU series packages acceptable

The substitute parts listed below maintain these core electrical and mechanical specifications, ensuring functional equivalence in standard rectification circuits. Parts are grouped by current rating capability and manufacturer availability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Package / Case	Product Status
KBU4M	onsemi	1 kV	4 A	1 V @ 4 A	-55°C ~ 150°C	4-SIP, KBU	Obsolete
GBU4M	Fairchild Semiconductor	1 kV	2.8 A	1 V @ 4 A	-50°C ~ 150°C	4-ESIP, GBU	Active
GBU410-G	Comchip Technology	1 kV	4 A	1 V @ 2 A	-55°C ~ 150°C	4-SIP, GBU	Active
GBU610-G	Comchip Technology	1 kV	6 A	1 V @ 3 A	-55°C ~ 150°C	4-SIP, GBU	Active
GBU810-G	Comchip Technology	1 kV	8 A	1 V @ 4 A	-55°C ~ 150°C	4-SIP, GBU	Active
GBU2510-G	Comchip Technology	1 kV	25 A	1 V @ 12.5 A	-55°C ~ 150°C	4-SIP, GBU	Active

Engineering Selection Recommendations

Direct Equivalent (Matched Current Rating): GBU410-G from Comchip Technology provides the closest electrical match with 4 A average rectified current and identical 1 kV voltage rating. This part maintains the same operating temperature range (-55°C ~ 150°C) and uses the standard 4-SIP GBU package. Product status is active with established supply availability.

Higher Current Capacity Options: GBU610-G (6 A) and GBU810-G (8 A) are suitable for applications requiring additional current margin. Both maintain 1 kV voltage rating and full temperature range compatibility. These parts are active products with confirmed inventory levels.

Extended Current Capacity: GBU2510-G (25 A) accommodates designs with significantly higher current requirements while maintaining all voltage and temperature specifications. This part is actively manufactured and widely available.

Lower Current Alternative: GBU4M from Fairchild Semiconductor operates at 2.8 A average rectified current, which is below the KBU4M specification. This part is suitable only for applications with reduced current demands and operates within a narrower temperature range (-50°C ~ 150°C).

All substitute parts listed carry REACH compliance and EAR99 export classification consistent with the original KBU4M specification.

Frequently Asked Questions (FAQ)

Q: Can GBU4M replace KBU4M directly? A: GBU4M is electrically compatible for 1 kV applications but operates at 2.8 A average rectified current, below the KBU4M rating of 4 A. Selection depends on actual circuit current requirements. The operating temperature range is also narrower (-50°C vs -55°C minimum).

Q: What is the difference between GBU410-G and GBU810-G? A: Both parts maintain 1 kV voltage rating and full temperature range. GBU410-G is rated for 4 A average rectified current, while GBU810-G is rated for 8 A. Selection is based on circuit current requirements. Higher-rated parts provide additional safety margin but do not affect voltage performance.

Q: Are package differences between KBU and GBU significant? A: Both KBU and GBU packages are 4-SIP through-hole configurations with identical pinout and PCB footprint compatibility. The package family designation reflects manufacturer conventions but does not affect electrical performance or mechanical fit.

Q: Why is GBU2510-G listed as a substitute for a 4 A application? A: GBU2510-G meets all voltage and temperature requirements and can be used in any application requiring 4 A or less. The higher 25 A rating provides design margin for future upgrades or transient conditions without changing the PCB layout.

Q: What compliance certifications apply to these substitute parts? A: All listed substitute parts carry REACH compliance status and EAR99 export classification. GBU series parts from Comchip Technology include RoHS3 compliance certification. Moisture sensitivity level is 1 (Unlimited) across all parts.

Q: Can I use these parts interchangeably in existing designs? A: Yes, all listed substitute parts are pin-compatible through-hole components with identical 4-SIP package footprints. No PCB modifications are required for substitution. Verify that the selected part's current rating meets or exceeds your circuit requirements.

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