RS504-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The RS504-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 400 V peak reverse voltage and 5 A average rectified current. This component is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Bridge rectifiers in this voltage and current class are used in power supply circuits, battery charging systems, and AC-to-DC conversion applications where single-phase rectification is required.

Key Parameters

Parameter	Value
Voltage - Peak Reverse (Max)	400 V
Current - Average Rectified (Io)	5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 5 A
Current - Reverse Leakage @ Vr	10 µA @ 400 V
Operating Temperature Range	-55°C ~ 125°C (TJ)
Mounting Type	Through Hole
Package / Case	4-SIP, RS-5
Diode Type	Single Phase
Technology	Standard

Substitute Part Grouping Explanation

Substitution for the RS504-G is determined by matching the following critical electrical parameters: 400 V peak reverse voltage rating, single-phase rectifier topology, through-hole mounting, and compatible package form factors. The substitute parts GBJ604-F and GBU6G both meet the 400 V voltage requirement and single-phase rectification function. Current ratings vary among substitutes (GBJ604-F at 6 A, GBU6G at 4.2 A), which affects suitability based on circuit requirements. Forward voltage characteristics, reverse leakage current, and operating temperature ranges differ between candidates and must be evaluated against specific application constraints. Package compatibility is limited to through-hole 4-SIP variants (RS-5, GBJ, or GBU form factors).

Parameter Comparison

Parameter	RS504-G (Main)	GBJ604-F (Substitute)	GBU6G (Substitute)
Manufacturer	Comchip Technology	Diodes Incorporated	Fairchild Semiconductor
Product Status	Obsolete	Active	Active
Voltage - Peak Reverse (Max)	400 V	400 V	400 V
Current - Average Rectified (Io)	5 A	6 A	4.2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 5 A	1 V @ 3 A	1 V @ 6 A
Current - Reverse Leakage @ Vr	10 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Operating Temperature Range	-55°C ~ 125°C (TJ)	-65°C ~ 150°C (TJ)	-50°C ~ 150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-SIP, RS-5	4-SIP, GBJ	4-ESIP, GBU
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

GBJ604-F is the primary substitute for RS504-G applications. This part is manufactured by Diodes Incorporated with active product status, ensuring long-term availability. The GBJ604-F exceeds the original current rating (6 A vs. 5 A), provides improved reverse leakage characteristics (5 µA vs. 10 µA), and supports an extended operating temperature range (-65°C to 150°C vs. -55°C to 125°C). The part is ROHS3 compliant, meeting modern regulatory requirements. Package compatibility requires verification of PCB footprint alignment between RS-5 and GBJ form factors.

GBU6G is a secondary substitute option from Fairchild Semiconductor, also with active product status. This part provides the widest operating temperature range (-50°C to 150°C) and improved reverse leakage performance. However, the current rating (4.2 A) falls below the original specification, making it suitable only for applications where the 5 A rating is not fully utilized. Package form factor (4-ESIP GBU) differs from the original RS-5, requiring PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can GBJ604-F directly replace RS504-G without PCB modifications? A: GBJ604-F and RS504-G use different package form factors (GBJ vs. RS-5). While both are 4-SIP through-hole packages, pin spacing and lead geometry may differ. PCB footprint compatibility must be confirmed before substitution.

Q: Is GBU6G suitable for all RS504-G applications? A: GBU6G has a lower average rectified current rating (4.2 A vs. 5 A). It is suitable only for circuits where the actual operating current does not exceed 4.2 A. Applications requiring the full 5 A capacity must use GBJ604-F.

Q: What are the compliance differences between substitutes? A: GBJ604-F carries ROHS3 compliance certification. GBU6G compliance status is not specified in available data. Both parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: How do forward voltage characteristics affect circuit performance? A: Forward voltage is specified at different current levels across parts (1 V @ 5 A for RS504-G, 1 V @ 3 A for GBJ604-F, 1 V @ 6 A for GBU6G). At the circuit's operating current, forward voltage drop determines power dissipation and heat generation. Circuits operating near 5 A should reference GBJ604-F specifications.

Q: Are there thermal considerations when substituting these parts? A: GBJ604-F and GBU6G support higher maximum junction temperatures (150°C vs. 125°C for RS504-G). Both substitutes have lower reverse leakage current, reducing standby power dissipation. Thermal design margins may improve with either substitute, but actual thermal performance depends on circuit layout and cooling provisions.

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