KBJ401G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The KBJ401G is a single-phase bridge rectifier manufactured by Diodes Incorporated, rated for 100 V peak reverse voltage and 4 A average rectified current. This component is in active product status and fully compliant with RoHS3 and REACH regulations. Bridge rectifiers of this class are essential in power supply circuits for AC-to-DC conversion. Substitute parts become necessary when voltage or current requirements differ from the original specification, when inventory constraints exist, or when design modifications require alternative electrical ratings within the same package family.

Key Parameters

Parameter	Value
Manufacturer Part Number	KBJ401G
Manufacturer	Diodes Incorporated
Category	Diodes
Diode Type	Single Phase
Voltage - Peak Reverse (Max)	100 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 100 V
Operating Temperature Range	-65°C to 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, KBJ
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the KBJ401G is determined by three critical parameters: voltage rating (peak reverse voltage), current rating (average rectified current), and package compatibility. All substitute parts listed maintain the 4-SIP KBJ through-hole package and single-phase bridge rectifier topology. Substitutes are grouped into two categories based on current capacity:

4 A Current Rating Group: KBJ4005G (50 V), KBJ402G (200 V), KBJ404G (400 V), KBJ406G (600 V), KBJ408G (800 V), and KBJ410G (1 kV). These parts share identical current handling and forward voltage characteristics with KBJ401G but differ in peak reverse voltage ratings.

6 A Current Rating Group: KBJ601G (100 V), KBJ604G (400 V), KBJ606G (600 V), and KBJ608G (800 V). These parts provide higher current capacity at the same or different voltage ratings.

All substitute parts maintain identical forward voltage drop (1 V maximum), reverse leakage current (5 µA), operating temperature range (-65°C to 150°C), and compliance certifications (RoHS3, REACH Unaffected).

Parameter Comparison

Part Number	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Current - Reverse Leakage @ Vr	Operating Temperature	Package / Case	Inventory Status
KBJ401G	100 V	4 A	1 V @ 2 A	5 µA @ 100 V	-65°C to 150°C	4-SIP, KBJ	747 Pcs
KBJ4005G	50 V	4 A	1 V @ 2 A	5 µA @ 50 V	-65°C to 150°C	4-SIP, KBJ	2620 Pcs
KBJ402G	200 V	4 A	1 V @ 2 A	5 µA @ 200 V	-65°C to 150°C	4-SIP, KBJ	669 Pcs
KBJ404G	400 V	4 A	1 V @ 2 A	5 µA @ 400 V	-65°C to 150°C	4-SIP, KBJ	928 Pcs
KBJ406G	600 V	4 A	1 V @ 2 A	5 µA @ 600 V	-65°C to 150°C	4-SIP, KBJ	10400 Pcs
KBJ408G	800 V	4 A	1 V @ 2 A	5 µA @ 800 V	-65°C to 150°C	4-SIP, KBJ	2154 Pcs
KBJ410G	1 kV	4 A	1 V @ 2 A	5 µA @ 1000 V	-65°C to 150°C	4-SIP, KBJ	800 Pcs
KBJ601G	100 V	6 A	1 V @ 3 A	5 µA @ 100 V	-65°C to 150°C	4-SIP, KBJ	3672 Pcs
KBJ604G	400 V	6 A	1 V @ 3 A	5 µA @ 400 V	-65°C to 150°C	4-SIP, KBJ	2294 Pcs
KBJ606G	600 V	6 A	1 V @ 3 A	5 µA @ 600 V	-65°C to 150°C	4-SIP, KBJ	1348 Pcs
KBJ608G	800 V	6 A	1 V @ 3 A	5 µA @ 800 V	-65°C to 150°C	4-SIP, KBJ	30400 Pcs

Engineering Selection Recommendations

Selection of substitute parts for KBJ401G must be based on circuit voltage and current requirements. All listed substitutes maintain active product status and full compliance with RoHS3 and REACH regulations, ensuring regulatory continuity in production environments.

For applications requiring 100 V operation at 4 A, KBJ401G remains the direct equivalent. When higher voltage ratings are required within the 4 A current class, KBJ402G (200 V), KBJ404G (400 V), KBJ406G (600 V), KBJ408G (800 V), or KBJ410G (1 kV) provide direct substitution with identical current and thermal characteristics. When lower voltage operation is acceptable, KBJ4005G (50 V) offers the same 4 A rating.

For applications requiring higher current capacity at 100 V operation, KBJ601G provides 6 A rating at identical voltage. Higher voltage applications with increased current demand are addressed by KBJ604G (400 V, 6 A), KBJ606G (600 V, 6 A), or KBJ608G (800 V, 6 A).

All substitutes maintain the 4-SIP KBJ through-hole package, ensuring mechanical and electrical compatibility without PCB redesign. Moisture sensitivity level remains at MSL 1 (Unlimited) across all parts, eliminating special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can KBJ401G be replaced with a lower voltage rating such as KBJ4005G?

A: KBJ4005G (50 V) can be used only if the circuit peak reverse voltage does not exceed 50 V. Using a lower voltage-rated rectifier in a higher voltage application will result in component failure. Voltage derating is not permitted.

Q: What is the difference between 4 A and 6 A rated bridge rectifiers in the KBJ family?

A: The 4 A series (KBJ401G, KBJ402G, KBJ404G, KBJ406G, KBJ408G, KBJ410G) and 6 A series (KBJ601G, KBJ604G, KBJ606G, KBJ608G) differ in maximum average rectified current capacity. The 6 A series also specifies forward voltage at 3 A instead of 2 A. Selection depends on circuit current requirements. Using a 6 A part in a 4 A application is acceptable; using a 4 A part in a 6 A application is not.

Q: Are all KBJ bridge rectifiers pin-compatible?

A: Yes. All parts listed use the 4-SIP KBJ through-hole package with identical pinout and mechanical dimensions. Direct PCB substitution is possible without layout modification.

Q: What compliance certifications apply to all substitute parts?

A: All parts are RoHS3 Compliant and REACH Unaffected. Moisture Sensitivity Level is MSL 1 (Unlimited) for all parts, requiring no special storage or handling procedures.

Q: Can KBJ401G be substituted with KBJ410G for a 100 V application?

A: Yes. KBJ410G (1 kV rating) can be used in a 100 V application. Higher voltage-rated rectifiers operate safely at lower voltages. However, this substitution may introduce unnecessary cost and component size considerations. Direct voltage-matched substitution with KBJ401G is preferred when available.

Q: What is the operating temperature range for all KBJ bridge rectifiers?

A: All parts operate from -65°C to 150°C junction temperature (TJ). This range is identical across the entire KBJ family and does not vary by voltage or current rating.

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