KBJ408G Bridge Rectifier Single Phase 800V 4A Equivalent & Substitute Parts

Part Overview

The KBJ408G is a single-phase bridge rectifier manufactured by Diodes Incorporated, rated for 800 V peak reverse voltage and 4 A average rectified current. This component is designed for through-hole mounting in the 4-SIP KBJ package configuration. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when design requirements specify different voltage ratings, current ratings, or when inventory constraints require alternative sourcing from the same manufacturer's KBJ series. All substitute parts listed maintain identical package geometry, mounting type, and core electrical characteristics within their respective voltage and current classes.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	KBJ408G	—
Manufacturer	Diodes Incorporated	—
Diode Type	Single Phase	—
Technology	Standard	—
Voltage - Peak Reverse (Max)	800	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 2 A
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	4-SIP, KBJ	—
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution within the KBJ series is determined by three primary parameters: voltage rating (peak reverse voltage), current rating (average rectified current), and package configuration. All parts in this series share identical package geometry (4-SIP KBJ), mounting type (through hole), forward voltage characteristics (1 V @ rated current), and operating temperature range (-65°C to 150°C).

The KBJ408G operates at 800 V with 4 A capacity. Substitute parts are grouped into two categories:

Lower Voltage, Same Current (4 A Series): KBJ4005G (50 V), KBJ401G (100 V), KBJ402G (200 V), KBJ404G (400 V), KBJ406G (600 V), and KBJ410G (1 kV). These parts maintain 4 A average rectified current but vary in peak reverse voltage rating.

Higher Current, Various Voltages (6 A Series): KBJ601G (100 V, 6 A), KBJ604G (400 V, 6 A), KBJ606G (600 V, 6 A), and KBJ608G (800 V, 6 A). These parts provide increased current capacity at 6 A while maintaining the same package and mounting configuration.

Substitution is valid when the replacement part's voltage rating meets or exceeds the application requirement and the current rating meets or exceeds the circuit demand.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring regulatory alignment with the KBJ408G. Selection between 4 A and 6 A series parts depends on circuit current requirements. The 4 A series (KBJ4005G through KBJ410G) provides direct current-matched substitution across voltage ratings from 50 V to 1 kV. The 6 A series (KBJ601G, KBJ604G, KBJ606G, KBJ608G) offers increased current capacity while maintaining identical package geometry and thermal characteristics.

For applications requiring 800 V operation with increased current headroom, KBJ608G (800 V, 6 A) is a direct package-compatible upgrade from KBJ408G. For applications requiring lower voltage ratings, select the appropriate voltage class within either the 4 A or 6 A series based on circuit specifications.

All parts share MSL 1 (unlimited) moisture sensitivity and identical operating temperature range, eliminating environmental or storage constraints as selection factors.

Frequently Asked Questions (FAQ)

Q: Can KBJ408G be replaced with a lower voltage rating part?

A: No. The KBJ408G is rated for 800 V peak reverse voltage. Substitute parts must have equal or higher voltage ratings. Lower voltage parts (KBJ4005G, KBJ401G, KBJ402G, KBJ404G, KBJ406G) are not suitable for 800 V applications.

Q: What is the difference between 4 A and 6 A series parts?

A: The primary difference is average rectified current capacity. The 4 A series (KBJ408G, KBJ406G, KBJ404G, etc.) is rated for 4 A continuous operation. The 6 A series (KBJ608G, KBJ606G, KBJ604G, etc.) is rated for 6 A continuous operation. Both series share identical package configuration, mounting type, and operating temperature range. Forward voltage increases proportionally with current rating (1 V @ 2 A for 4 A parts; 1 V @ 3 A for 6 A parts).

Q: Are all substitute parts in the same package?

A: Yes. All listed parts use the 4-SIP KBJ package configuration with through-hole mounting. Direct board-level substitution is possible without PCB layout modification.

Q: Can KBJ408G be replaced with KBJ410G?

A: Yes. KBJ410G (1 kV, 4 A) has higher voltage rating and identical current capacity. It is a direct substitute for applications where 800 V operation is required, as the 1 kV rating provides additional voltage margin.

Q: What inventory considerations apply to substitution?

A: KBJ608G has the highest inventory (30,400 pcs), followed by KBJ406G (10,400 pcs). Lower inventory parts include KBJ402G (669 pcs) and KBJ401G (747 pcs). Inventory levels should be considered for supply chain continuity in production environments.

Q: Do all parts meet the same compliance standards?

A: Yes. All listed parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. All parts maintain MSL 1 (unlimited) moisture sensitivity level and identical operating temperature range (-65°C to 150°C).

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