RL204 Equivalent & Substitute Parts Reference

Part Overview

The RL204 is a general-purpose rectifier diode rated for 400 V DC reverse voltage and 2 A average rectified current in a through-hole DO-15 package. This component is classified as obsolete by SMC Diode Solutions. Locating equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

RL204

SMC Diode SolutionsIn Stock: 1669RL204 Datasheet

Current PartRFQ

RL204G

SMC Diode SolutionsIn Stock: 1067RL204G Datasheet

DirectRFQ

1N5395G B0G

Taiwan Semiconductor CorporationIn Stock: 8161N5395G B0G Datasheet

SimilarRFQ

SF2L6G B0G

Taiwan Semiconductor CorporationIn Stock: 640SF2L6G B0G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RL204 are grouped based on electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 400 V minimum
• Current - Average Rectified (Io): 2 A or greater
• Mounting Type: Through Hole
• Package / Case: DO-15 or DO-204AC compatible
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V or lower

Direct Equivalent: RL204G meets all primary criteria with identical electrical ratings and active product status.

Similar Substitutes: 1N5395G B0G and SF2L6G B0G meet the voltage and package requirements. The 1N5395G B0G operates at 1.5 A, which is below the 2 A requirement but maintains the 400 V rating. The SF2L6G B0G matches the 2 A current rating and 400 V voltage rating with enhanced fast recovery characteristics.

Parameter Comparison

Engineering Selection Recommendations

RL204G (Direct Equivalent): This part is the primary substitute for the obsolete RL204. Both components are manufactured by SMC Diode Solutions and share identical electrical specifications for voltage, current, and reverse leakage. The RL204G is active in production and ROHS3 compliant. The extended operating temperature range (-65°C ~ 175°C versus -65°C ~ 125°C) provides additional thermal margin. Forward voltage is marginally higher at 1.1 V versus 1 V, which is within acceptable tolerance for general-purpose rectification applications.

SF2L6G B0G (Current-Matched Substitute): This Taiwan Semiconductor Corporation part matches the 2 A current rating and 400 V voltage specification. It features fast recovery characteristics (35 ns trr) compared to the standard recovery of the RL204. The lower reverse leakage current (1 µA versus 5 µA) and higher forward voltage (1.3 V @ 2 A) are trade-offs inherent to fast recovery technology. This part is suitable for applications where switching speed is beneficial or where lower leakage current is required.

1N5395G B0G (Voltage-Matched Substitute): This part maintains the 400 V voltage rating and standard recovery speed but is rated for 1.5 A average rectified current. This part is suitable only for applications where the circuit design can accommodate reduced current capacity or where the RL204 is used in a non-critical current path.

All substitute parts maintain DO-15 package compatibility, through-hole mounting, and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can RL204G be used as a direct replacement for RL204?

A: Yes. The RL204G is the direct equivalent manufactured by the same supplier. Both parts share identical voltage (400 V), current (2 A), and reverse leakage (5 µA @ 400 V) specifications. The RL204G is active in production and offers an extended operating temperature range.

Q: What is the difference between RL204G and SF2L6G B0G?

A: Both parts are rated for 400 V and 2 A. The primary difference is recovery speed: RL204G uses standard recovery (>500ns) while SF2L6G B0G uses fast recovery (≤500ns, 35 ns trr). SF2L6G B0G also has lower reverse leakage (1 µA versus 5 µA) but higher forward voltage (1.3 V versus 1.1 V @ 2 A). Fast recovery diodes are preferred in switching applications where reduced switching losses are important.

Q: Can 1N5395G B0G replace RL204 in all applications?

A: No. The 1N5395G B0G is rated for 1.5 A average rectified current, which is 25% lower than the RL204's 2 A rating. This part is suitable only for circuits where the actual current demand does not exceed 1.5 A or where the RL204 is used in a non-critical current path.

Q: Are all substitute parts available in the same DO-15 package?

A: Yes. All substitute parts listed are available in DO-15 (DO-204AC) through-hole axial packages, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What compliance certifications should I verify for new designs?

A: RL204G, 1N5395G B0G, and SF2L6G B0G are all ROHS3 compliant. RL204G is REACH Affected, while 1N5395G B0G and SF2L6G B0G are REACH Unaffected. Verify compliance requirements for your specific application and regulatory jurisdiction.

Q: How does operating temperature range affect part selection?

A: RL204 operates from -65°C to 125°C, RL204G from -65°C to 175°C, and both Taiwan Semiconductor parts from -55°C to 150°C. RL204G provides the widest high-temperature margin. For applications with extreme temperature requirements, verify that the selected part's operating range meets your thermal specifications.

Q: What is the significance of reverse leakage current differences?

A: RL204, RL204G, and 1N5395G B0G all specify 5 µA @ 400 V reverse leakage. SF2L6G B0G specifies 1 µA @ 400 V, which is lower. Lower reverse leakage reduces standby power consumption and heat generation in high-impedance circuits. This difference is typically negligible in standard rectification applications.