RL206G General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The RL206G is a general purpose rectifier diode manufactured by SMC Diode Solutions, rated for 800V DC reverse voltage and 2A average rectified current in a DO-15 through-hole package. This diode is currently in active product status with full RoHS3 compliance and REACH affected designation. Substitute parts become necessary when addressing inventory constraints, obsolescence of alternative designs, or specific application requirements related to recovery speed characteristics and forward voltage performance.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 2 A	V
Speed Classification	Standard Recovery	-
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-
Operating Temperature - Junction	-65 to 175	°C
Product Status	Active	-
RoHS Status	RoHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the RL206G is determined by equivalence in the following critical parameters:

Mandatory Equivalence Parameters:

Voltage - DC Reverse (Vr) (Max): 800V
Current - Average Rectified (Io): 2A
Mounting Type: Through Hole
Package / Case: DO-15 (DO-204AC, Axial)

Performance Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Acceptable range 1.1V to 1.7V @ 2A
Speed Classification: Standard Recovery or Fast Recovery
Current - Reverse Leakage @ Vr: 5µA @ 800V (fixed specification)
Operating Temperature - Junction: Minimum -65°C to maximum 150°C or higher

The EGP20K qualifies as a substitute part based on matching voltage, current, and package specifications. Differences exist in forward voltage characteristics, recovery speed classification, and product status.

Parameter Comparison

Parameter	RL206G (Main Part)	EGP20K (Substitute)	Compatibility Notes
Manufacturer	SMC Diode Solutions	Nexperia USA Inc.	Different manufacturers
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 2 A	1.7 V @ 2 A	EGP20K exhibits higher forward voltage drop
Speed Classification	Standard Recovery >500ns	Fast Recovery ≤500ns	EGP20K has faster recovery characteristics
Reverse Recovery Time (trr)	Not specified	75 ns	EGP20K specifies trr value
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	Equivalent
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	EGP20K exhibits higher junction capacitance
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	Equivalent
Operating Temperature - Junction	-65°C to 175°C	-65°C to 150°C	RL206G supports higher maximum junction temperature
Product Status	Active	Obsolete	RL206G is current production; EGP20K is discontinued
RoHS Status	RoHS3 Compliant	RoHS non-compliant	RL206G meets current environmental standards
REACH Status	REACH Affected	REACH Unaffected	Different regulatory classifications

Engineering Selection Recommendations

Primary Selection: RL206G

The RL206G is the recommended primary selection for new designs and applications. It maintains active product status with full RoHS3 compliance and REACH affected designation, ensuring alignment with current environmental and regulatory requirements. The part offers superior operating temperature range (-65°C to 175°C) and lower forward voltage drop (1.1V @ 2A), resulting in reduced power dissipation in rectification applications.

Substitute Selection: EGP20K

The EGP20K functions as a functional substitute where voltage and current ratings are the primary selection criteria and where fast recovery characteristics (≤500ns, 75ns trr) provide circuit performance advantages. However, this part carries obsolete product status and RoHS non-compliance designation. Selection of EGP20K is appropriate only for legacy system maintenance, repair of existing equipment, or applications where fast recovery speed is a critical design requirement that outweighs compliance considerations.

Key Differences Affecting Selection:

Forward voltage drop differential (0.6V higher in EGP20K) results in increased power dissipation and thermal load. Maximum junction temperature rating is 25°C lower in EGP20K. Junction capacitance is 2.25 times higher in EGP20K, affecting high-frequency switching performance. Recovery speed classification differs, with EGP20K providing faster switching transitions suitable for specific power conversion topologies.

Frequently Asked Questions (FAQ)

Q: Can EGP20K be used as a direct replacement for RL206G in all applications?

A: EGP20K meets the fundamental voltage (800V) and current (2A) requirements and shares the DO-15 package, enabling physical and electrical substitution in most through-hole rectifier applications. However, the higher forward voltage drop (1.7V vs 1.1V) and faster recovery speed alter circuit performance characteristics. Applications sensitive to power dissipation or operating at elevated temperatures should account for the 25°C lower maximum junction temperature rating of EGP20K.

Q: What are the implications of the forward voltage difference between RL206G and EGP20K?

A: The 0.6V forward voltage differential results in increased power dissipation during conduction. In a 2A application, this represents an additional 1.2W of heat generation per diode. Thermal design calculations must account for this increased dissipation when considering EGP20K substitution, particularly in high-duty-cycle or high-ambient-temperature environments.

Q: Why does EGP20K have faster recovery speed than RL206G?

A: EGP20K is classified as a fast recovery diode (≤500ns, 75ns trr) while RL206G is a standard recovery diode (>500ns). This difference reflects different semiconductor processing and doping profiles. Fast recovery characteristics reduce switching losses in high-frequency applications but increase junction capacitance (45pF vs 20pF), which may introduce other performance considerations in specific circuit topologies.

Q: Are there compliance or regulatory reasons to prefer RL206G over EGP20K?

A: Yes. RL206G carries RoHS3 compliance and active product status, meeting current environmental and regulatory standards. EGP20K is RoHS non-compliant and obsolete. For applications subject to RoHS requirements or where long-term supply chain stability is important, RL206G is the appropriate selection.

Q: Can the DO-15 package dimensions be assumed identical between RL206G and EGP20K?

A: Both parts use the DO-204AC/DO-15 axial package designation. Standard DO-15 package dimensions are defined by industry specifications. Physical compatibility for through-hole mounting is established. However, lead diameter, lead spacing, or other mechanical tolerances may vary between manufacturers. Verification of mechanical fit is recommended for applications with tight mechanical constraints.

Q: What is the significance of the 25°C difference in maximum junction temperature between these parts?

A: RL206G supports operation to 175°C junction temperature while EGP20K is rated to 150°C. This 25°C difference affects thermal margin in high-temperature applications. In environments approaching or exceeding 125°C ambient temperature, RL206G provides greater thermal headroom. EGP20K substitution in such applications requires thermal analysis to ensure junction temperature remains within specification.

Q: How does the capacitance difference (20pF vs 45pF) affect circuit performance?

A: Higher junction capacitance in EGP20K (45pF @ 4V, 1MHz) affects high-frequency switching behavior and may influence circuit response in applications with fast transient switching or high-frequency rectification. Standard 50/60Hz line-frequency rectifier applications are generally unaffected. High-frequency switching power supplies or RF rectification circuits should evaluate the capacitance impact on circuit performance.

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