KBU8B Bridge Rectifier Single Phase 100V 8A Equivalent & Substitute Parts

Part Overview

The KBU8B is a single-phase bridge rectifier manufactured by onsemi, rated for 100V peak reverse voltage and 8A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The KBU8B operates across a temperature range of -55°C to 150°C and is packaged in a 4-SIP through-hole configuration.

Key Parameters

Parameter	Value
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	8 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 8 A
Current - Reverse Leakage @ Vr	10 µA @ 100 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP
Diode Type	Single Phase
Technology	Standard

Substitute Part Grouping Explanation

Substitute parts for the KBU8B are classified based on electrical parameter compatibility within the single-phase bridge rectifier category. The primary substitution criteria are:

Voltage - Peak Reverse (Max): 100 V minimum
Current - Average Rectified (Io): 8 A or greater
Operating Temperature Range: -55°C to 150°C minimum
Mounting Type: Through Hole
Package / Case: 4-SIP configuration (KBU or GBU variants)
Diode Type: Single Phase
Technology: Standard

Parts meeting these parameters are classified as direct or parametric equivalents. Parts with lower current ratings (4A, 4.2A, 6A) are classified as similar alternatives suitable for applications with reduced current requirements.

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
KBU8B	onsemi	100 V	8 A	1 V @ 8 A	10 µA @ 100 V	-55°C ~ 150°C	4-SIP, KBU	Obsolete
GBU8B	onsemi	100 V	8 A	1 V @ 8 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Not For New Designs
GBU801-G	Comchip Technology	100 V	8 A	1 V @ 4 A	5 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU601-G	Comchip Technology	100 V	6 A	1 V @ 3 A	10 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU401-G	Comchip Technology	100 V	4 A	1 V @ 2 A	10 µA @ 100 V	-55°C ~ 150°C	4-SIP, GBU	Active
GBU2501-G	Comchip Technology	100 V	4.2 A	1 V @ 12.5 A	10 µA @ 50 V	-55°C ~ 150°C	4-SIP, GBU	Active

Engineering Selection Recommendations

Direct Equivalent (Parametric Match): GBU801-G from Comchip Technology is the primary active substitute for KBU8B. It matches the 100V, 8A electrical specifications and maintains the through-hole 4-SIP package configuration. GBU801-G holds ROHS3 compliance and active product status, making it suitable for new designs.

Alternative from Original Manufacturer: GBU8B from onsemi provides parametric equivalence with identical voltage and current ratings. However, GBU8B is classified as "Not For New Designs," limiting its use to legacy system support or existing inventory applications.

Lower Current Alternatives: GBU601-G (6A), GBU401-G (4A), and GBU2501-G (4.2A) are suitable only for applications with reduced current requirements below 8A. These parts maintain 100V voltage rating and -55°C to 150°C operating range but cannot support full 8A load conditions.

All substitute parts listed maintain single-phase bridge rectifier topology, standard technology classification, and through-hole mounting. Selection should prioritize parts with active product status for new designs.

Frequently Asked Questions (FAQ)

Q: Can GBU8B replace KBU8B directly? A: GBU8B provides electrical equivalence with identical 100V and 8A ratings. However, GBU8B is classified as "Not For New Designs." For legacy systems, GBU8B is compatible; for new designs, GBU801-G is recommended.

Q: What is the difference between KBU and GBU package designations? A: Both KBU and GBU are 4-SIP through-hole package configurations for single-phase bridge rectifiers. The designations reflect different manufacturer product lines. Electrical performance and pinout compatibility are maintained across both package types for equivalent voltage and current ratings.

Q: Can lower-rated parts like GBU601-G or GBU401-G be used in place of KBU8B? A: GBU601-G (6A) and GBU401-G (4A) have lower current ratings than KBU8B (8A). These parts are suitable only for applications requiring less than their rated current. Using an undersized part in an 8A application will result in component failure or thermal stress.

Q: Are all substitute parts RoHS compliant? A: GBU8B, GBU801-G, GBU601-G, GBU401-G, and GBU2501-G are ROHS3 compliant. KBU8B does not specify RoHS status in the provided data.

Q: What is the temperature operating range for these parts? A: All listed parts operate across -55°C to 150°C junction temperature range, matching KBU8B specifications.

Q: How do reverse leakage currents compare? A: KBU8B and GBU601-G specify 10 µA @ 100V. GBU8B and GBU801-G specify 5 µA @ 100V, indicating lower leakage. GBU2501-G specifies 10 µA @ 50V, with leakage measured at a lower voltage reference.

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