KBJ404G Bridge Rectifier Single Phase 400V 4A Equivalent & Substitute Parts

Part Overview

The KBJ404G is a single-phase bridge rectifier manufactured by Diodes Incorporated, rated for 400 V peak reverse voltage and 4 A average rectified current. This component is in active product status and ROHS3 compliant. Bridge rectifiers of this class are essential in power supply circuits for AC-to-DC conversion. Equivalent and substitute parts are identified based on matching electrical performance parameters within the KBJ series, allowing for component selection flexibility across different voltage and current ratings while maintaining through-hole KBJ package compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	KBJ404G
Manufacturer	Diodes Incorporated
Category	Diodes
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	4 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A
Current - Reverse Leakage @ Vr	5 µA @ 400 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

Substitute parts for the KBJ404G are selected from the Diodes Incorporated KBJ series based on the following criteria:

Matching Parameters (Required for Substitution):

Diode Type: Single Phase
Technology: Standard
Mounting Type: Through Hole
Package / Case: 4-SIP, KBJ
Operating Temperature Range: -65°C to 150°C (TJ)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Variable Parameters (Define Substitution Groups):

Voltage - Peak Reverse (Max): 50 V, 100 V, 200 V, 400 V, 600 V, 800 V, 1 kV
Current - Average Rectified (Io): 4 A or 6 A

The KBJ404G (400 V, 4 A) can be substituted with parts sharing identical current rating (4 A) and compatible voltage ratings. Parts with higher voltage ratings provide overvoltage margin; parts with lower voltage ratings are suitable only for reduced-voltage applications. Current rating must match or exceed application requirements; substitution with lower current ratings is not permitted.

Parameter Comparison

Part Number	Voltage - Peak Reverse (Max)	Current - Average Rectified (Io)	Vf (Max) @ If	Reverse Leakage @ Vr	Inventory Status
KBJ404G	400 V	4 A	1 V @ 2 A	5 µA @ 400 V	928 Pcs
KBJ4005G	50 V	4 A	1 V @ 2 A	5 µA @ 50 V	2620 Pcs
KBJ401G	100 V	4 A	1 V @ 2 A	5 µA @ 100 V	747 Pcs
KBJ402G	200 V	4 A	1 V @ 2 A	5 µA @ 200 V	669 Pcs
KBJ406G	600 V	4 A	1 V @ 2 A	5 µA @ 600 V	10400 Pcs
KBJ408G	800 V	4 A	1 V @ 2 A	5 µA @ 800 V	2154 Pcs
KBJ410G	1 kV	4 A	1 V @ 2 A	5 µA @ 1000 V	800 Pcs

Engineering Selection Recommendations

All substitute parts listed are manufactured by Diodes Incorporated and maintain ROHS3 compliance and active product status. Selection between KBJ404G and alternative voltage ratings depends on circuit voltage requirements:

KBJ4005G (50 V): Suitable for low-voltage applications only; not recommended for 400 V circuits.
KBJ401G (100 V): Suitable for circuits operating at or below 100 V; not recommended for 400 V circuits.
KBJ402G (200 V): Suitable for circuits operating at or below 200 V; not recommended for 400 V circuits.
KBJ404G (400 V): Primary selection for 400 V rated circuits.
KBJ406G (600 V): Suitable for 400 V circuits with overvoltage margin; higher voltage rating provides additional safety margin.
KBJ408G (800 V): Suitable for 400 V circuits with extended overvoltage margin.
KBJ410G (1 kV): Suitable for 400 V circuits with maximum overvoltage margin.

All parts share identical forward voltage characteristics (1 V @ 2 A) and reverse leakage specifications at their respective voltage ratings. Through-hole KBJ package compatibility ensures mechanical interchangeability across all listed parts.

Frequently Asked Questions (FAQ)

Q: Can KBJ406G replace KBJ404G in a 400 V circuit? A: Yes. KBJ406G is rated for 600 V peak reverse voltage, which exceeds the 400 V requirement. The higher voltage rating provides overvoltage protection margin while maintaining identical current capacity (4 A) and forward voltage characteristics.

Q: Can KBJ402G replace KBJ404G? A: No. KBJ402G is rated for 200 V peak reverse voltage, which is insufficient for 400 V circuits. Using an undersized voltage rating risks component failure.

Q: Are all substitute parts mechanically compatible? A: Yes. All listed parts use the 4-SIP, KBJ through-hole package, ensuring direct mechanical interchangeability on PCBs designed for KBJ-series bridge rectifiers.

Q: What is the difference between 4 A and 6 A rated parts? A: Current rating determines maximum average rectified current capacity. KBJ404G is rated for 4 A; 6 A rated parts (KBJ601G, KBJ604G, KBJ606G, KBJ608G) are designed for higher current applications and are not direct substitutes for 4 A circuits.

Q: Do all parts meet the same compliance standards? A: Yes. All listed parts are ROHS3 compliant, have MSL rating of 1 (Unlimited), and maintain active product status from Diodes Incorporated.

Q: What determines forward voltage in these bridge rectifiers? A: Forward voltage is specified at a defined test current. For 4 A rated parts, Vf is 1 V @ 2 A. This parameter remains constant across all voltage ratings within the 4 A current class.

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