RS503-G Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The RS503-G is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 200 V peak reverse voltage with 5 A average rectified current. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations. Bridge rectifiers in this voltage and current class are widely used in power supply circuits, industrial equipment, and consumer electronics requiring AC-to-DC conversion.

Key Parameters

Parameter	Value
Voltage - Peak Reverse (Max)	200 V
Current - Average Rectified (Io)	5 A
Voltage - Forward (Vf) (Max)	1 V @ 5 A
Current - Reverse Leakage @ Vr	10 µA @ 200 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 of the RS503-G is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

Voltage - Peak Reverse (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 5 A
Diode Type: Must be Single Phase
Technology: Must be Standard
Mounting Type: Must be Through Hole

Mechanical Compatibility Requirements:

Package / Case: Must be compatible with 4-SIP form factor

The GBU8D meets all substitution criteria with equivalent or superior electrical ratings and identical mounting configuration, enabling direct functional replacement in applications previously using the RS503-G.

Parameter Comparison

Parameter	RS503-G (Comchip)	GBU8D (Diotec)	Compatibility
Voltage - Peak Reverse (Max)	200 V	200 V	Equivalent
Current - Average Rectified (Io)	5 A	5.6 A	Compatible (higher rating)
Voltage - Forward (Vf) (Max)	1 V @ 5 A	1 V @ 8 A	Compatible
Current - Reverse Leakage @ Vr	10 µA @ 200 V	5 µA @ 200 V	Compatible (lower leakage)
Operating Temperature Range	-55°C ~ 125°C (TJ)	-50°C ~ 150°C (TJ)	Compatible (wider range)
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	4-SIP, RS-5	4-SIP, GBU	Compatible (same form factor)
Diode Type	Single Phase	Single Phase	Equivalent
Technology	Standard	Standard	Equivalent
Product Status	Obsolete	Active	Substitute available

Engineering Selection Recommendations

The GBU8D from Diotec Semiconductor is the qualified substitute for the obsolete RS503-G. Selection is based on the following engineering factors:

Product Status: The RS503-G is obsolete, while the GBU8D maintains active production status, ensuring long-term availability and supply chain continuity.

Electrical Performance: The GBU8D provides equivalent peak reverse voltage (200 V) and exceeds the minimum current requirement (5.6 A vs. 5 A), with improved reverse leakage characteristics (5 µA vs. 10 µA). Forward voltage characteristics remain equivalent at 1 V.

Thermal Performance: The GBU8D operates across a wider temperature range (-50°C ~ 150°C) compared to the RS503-G (-55°C ~ 125°C), providing enhanced thermal margin in applications approaching upper temperature limits.

Mechanical Compatibility: Both components utilize identical 4-SIP through-hole mounting configuration, enabling direct PCB footprint compatibility without layout modifications.

Compliance and Certifications: The GBU8D maintains active manufacturer support with current compliance documentation, whereas the RS503-G, as an obsolete part, lacks ongoing technical support and updated certifications.

Frequently Asked Questions (FAQ)

Q: Can the GBU8D directly replace the RS503-G without PCB modifications?

A: Yes. Both components use identical 4-SIP through-hole mounting configuration and pin spacing, allowing direct substitution without PCB layout changes.

Q: What are the key electrical differences between these parts?

A: The GBU8D provides higher current capacity (5.6 A vs. 5 A) and lower reverse leakage current (5 µA vs. 10 µA) at the same 200 V peak reverse voltage rating. Forward voltage characteristics are equivalent.

Q: Why is the GBU8D recommended over other 200 V bridge rectifiers?

A: The GBU8D meets all critical substitution parameters: equivalent voltage rating, equal or superior current rating, identical diode type (single phase standard), matching through-hole mounting, and compatible 4-SIP package form factor. Additionally, it maintains active production status with current availability.

Q: Are there any thermal considerations when substituting the GBU8D?

A: The GBU8D operates across a wider temperature range (-50°C ~ 150°C) than the RS503-G (-55°C ~ 125°C). In applications operating near the upper temperature limit of the original part, the GBU8D provides additional thermal margin.

Q: What is the package compatibility between RS-5 and GBU designations?

A: Both RS-5 and GBU designations refer to 4-SIP (Single In-line Package) form factors with identical pin configurations and through-hole spacing, ensuring mechanical and electrical compatibility.

Q: Is the GBU8D suitable for high-reliability applications?

A: The GBU8D is manufactured by Diotec Semiconductor with active product status and current compliance documentation. It is suitable for applications requiring documented manufacturer support and ongoing technical resources.

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