Equivalent & Substitute Parts for W08G Bridge Rectifier

Part Overview

The W08G is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 800 V peak reverse voltage and 1.5 A average rectified current. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The W08G operates across a temperature range of -55°C to 150°C and is packaged in a 4-Circular WOG configuration for through-hole mounting.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	800 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole
Package / Case	4-Circular, WOG

Substitute Part Grouping Explanation

Substitution for the W08G bridge rectifier is determined by strict equivalence across the following critical parameters:

Diode Type: Single Phase
Technology: Standard
Voltage - Peak Reverse (Max): 800 V minimum
Current - Average Rectified (Io): Equal to or greater than 1.5 A
Operating Temperature Range: -55°C ~ 150°C or wider
Mounting Type: Through Hole

Two substitute parts are identified based on these criteria:

W08G-E4/51 (Vishay General Semiconductor - Diodes Division): Parametric equivalent with identical electrical specifications and active product status.

GBU2508-G (Comchip Technology): Manufacturer-recommended substitute with higher current rating (4.2 A) and different package configuration (4-SIP, GBU).

Parameter Comparison

Parameter	W08G	W08G-E4/51	GBU2508-G
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Comchip Technology
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
Voltage - Peak Reverse (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	1.5 A	1.5 A	4.2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 12.5 A
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	10 µA @ 800 V
Operating Temperature Range	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-Circular, WOG	4-Circular, WOG	4-SIP, GBU
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

W08G-E4/51 is the direct parametric equivalent and preferred substitute. It maintains identical electrical specifications and operating characteristics while offering active product status and ROHS3 compliance. The packaging remains unchanged (4-Circular, WOG), requiring no PCB layout modifications. This substitute is suitable for direct replacement in all applications where the W08G was originally specified.

GBU2508-G serves as a manufacturer-recommended alternative with higher current capacity (4.2 A versus 1.5 A). This substitute accommodates applications requiring increased current handling while maintaining the same 800 V voltage rating and operating temperature range. However, the package configuration differs (4-SIP, GBU versus 4-Circular, WOG), necessitating PCB layout evaluation and potential mechanical redesign. Both substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can W08G-E4/51 be used as a direct replacement for W08G?

A: Yes. W08G-E4/51 is a parametric equivalent with identical voltage rating (800 V), current rating (1.5 A), forward voltage characteristics, reverse leakage, and operating temperature range. The package configuration (4-Circular, WOG) is unchanged, allowing direct PCB substitution without layout modifications.

Q: What is the primary difference between W08G-E4/51 and GBU2508-G?

A: W08G-E4/51 maintains identical electrical and mechanical specifications to the W08G. GBU2508-G offers higher average rectified current (4.2 A) and uses a different package configuration (4-SIP, GBU). GBU2508-G requires PCB layout evaluation due to package differences.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both W08G-E4/51 and GBU2508-G are ROHS3 compliant, whereas the original W08G is RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulations.

Q: Does package configuration affect substitution?

A: Yes. W08G-E4/51 uses the same 4-Circular WOG package as the original W08G and requires no PCB modifications. GBU2508-G uses a 4-SIP GBU package, requiring PCB layout verification and potential mechanical redesign before implementation.

Q: Can GBU2508-G be used in applications rated for 1.5 A?

A: Yes. GBU2508-G is rated for 4.2 A average rectified current, which exceeds the 1.5 A requirement. The higher current rating does not prevent use in lower-current applications, provided package configuration is compatible with the PCB design.

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