W04G Bridge Rectifier Single Phase 400V 1.5A Equivalent & Substitute Parts

Part Overview

The W04G is a single-phase bridge rectifier manufactured by Vishay General Semiconductor - Diodes Division, rated for 400V peak reverse voltage and 1.5A average rectified current. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The W04G operates across a temperature range of -55°C to 150°C and is housed in a 4-Circular WOG package for through-hole mounting applications.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A
Current - Reverse Leakage @ Vr	5 µA @ 400 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 W04G is determined by the following critical parameters:

Voltage - Peak Reverse (Max): 400 V minimum
Current - Average Rectified (Io): Must meet or exceed 1.5 A
Diode Type: Single Phase
Technology: Standard
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 150°C or wider

Substitute parts are grouped into two categories based on their relationship to the main part:

Parametric Equivalent (W04G-E4/51): Identical electrical specifications and package type, with active product status and improved compliance certifications.

Manufacturer Recommended Substitute (GBU2504-G): Meets or exceeds all critical electrical parameters with higher current rating (25A vs 1.5A), different package form factor (4-SIP GBU vs 4-Circular WOG), and active product status.

Parameter Comparison

Parameter	W04G (Main Part)	W04G-E4/51 (Parametric Equivalent)	GBU2504-G (Manufacturer Recommended)
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Comchip Technology
Product Status	Obsolete	Active	Active
Diode Type	Single Phase	Single Phase	Single Phase
Voltage - Peak Reverse (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	1.5 A	1.5 A	25 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 @ 400 V	5 µA @ 400 V	10 µA @ 400 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
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	949 Pcs New Original In Stock	4453 Pcs New Original In Stock	864 Pcs New Original In Stock

Engineering Selection Recommendations

W04G-E4/51 is the direct parametric equivalent for applications requiring identical electrical performance and package compatibility. This part maintains the same 4-Circular WOG package footprint, enabling direct board-level substitution without layout modifications. The W04G-E4/51 carries active product status and ROHS3 compliance, providing superior long-term availability and regulatory alignment compared to the obsolete W04G.

GBU2504-G is suitable for applications where the circuit design permits package form factor changes from 4-Circular WOG to 4-SIP GBU. This substitute provides significantly higher current capacity (25A vs 1.5A) while maintaining the 400V voltage rating and through-hole mounting compatibility. The GBU2504-G is recommended for designs requiring enhanced thermal performance or future current margin. ROHS3 compliance and active product status ensure procurement continuity.

Selection between W04G-E4/51 and GBU2504-G depends on PCB layout constraints and thermal requirements. If board layout accommodates the GBU package and higher current capacity is acceptable, GBU2504-G offers superior performance headroom. If package footprint must remain unchanged, W04G-E4/51 provides direct compatibility.

Frequently Asked Questions (FAQ)

Q: Can W04G-E4/51 be used as a direct replacement for W04G?

A: Yes. W04G-E4/51 is a parametric equivalent with identical electrical specifications (400V, 1.5A, 1V forward voltage, 5µA reverse leakage) and the same 4-Circular WOG package. No circuit modifications or board layout changes are required.

Q: What is the primary difference between W04G-E4/51 and GBU2504-G?

A: W04G-E4/51 maintains identical current rating (1.5A) and package form factor (4-Circular WOG). GBU2504-G provides higher current capacity (25A) and uses a different package (4-SIP GBU). Both share the same 400V voltage rating and through-hole mounting type.

Q: Can GBU2504-G be used in place of W04G without PCB modifications?

A: GBU2504-G requires PCB layout changes due to its different package form factor (4-SIP GBU vs 4-Circular WOG). Pin spacing and footprint differ, necessitating board redesign. Electrical compatibility is confirmed, but mechanical integration requires engineering review.

Q: Are there compliance differences between these parts?

A: W04G is RoHS non-compliant. Both W04G-E4/51 and GBU2504-G are ROHS3 compliant. For applications subject to RoHS regulations, W04G-E4/51 or GBU2504-G must be selected.

Q: Which substitute offers the best long-term availability?

A: Both W04G-E4/51 and GBU2504-G carry active product status. W04G-E4/51 has higher current inventory (4453 pcs vs 864 pcs), providing superior near-term availability. Both are manufactured by established suppliers with ongoing production.

Q: What are the thermal considerations when selecting between these parts?

A: GBU2504-G, with its higher current rating (25A), is designed for higher thermal loads and provides better thermal performance margin in applications approaching the 1.5A limit. W04G-E4/51 maintains the original thermal design point at 1.5A.

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