BY550-600 Equivalent & Substitute Parts

Part Overview

The BY550-600 is a general-purpose rectifier diode manufactured by Diotec Semiconductor, rated for 600 V DC reverse voltage and 5 A average rectified current. It features a through-hole DO-201AA axial package and standard recovery characteristics suitable for general rectification applications. The part is currently in active production status with 20,100 units in stock.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit operation within the electrical and mechanical parameters of alternative qualified components. The 1N5406RLG represents a compatible alternative with equivalent voltage ratings and package compatibility, though with reduced current capacity.

Substiute Parts

BY550-600

Diotec SemiconductorIn Stock: 20165BY550-600 Datasheet

Current PartRFQ

1N5406RLG

onsemiIn Stock: 168171N5406RLG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BY550-600 is determined by the following critical parameters:

Voltage Compatibility: The substitute part must maintain a DC reverse voltage rating (Vr) of 600 V or greater to ensure safe operation in the same circuit topology.

Package Compatibility: The substitute must utilize the DO-201AA, DO-27, or equivalent axial through-hole package to ensure mechanical fit on printed circuit boards designed for the BY550-600.

Current Rating: While the BY550-600 is rated for 5 A average rectified current, substitute parts with lower current ratings (such as 3 A) remain functionally compatible in applications where the actual circuit current does not exceed the substitute's rating.

Recovery Characteristics: Standard recovery speed (>500 ns, >200 mA) is maintained across qualified substitutes to preserve switching behavior in rectification circuits.

Temperature Range: Operating temperature ranges may vary between the main part and substitutes; circuit design must confirm that the substitute's junction temperature range accommodates the application environment.

The 1N5406RLG meets voltage, package, and recovery criteria but operates at 3 A versus the 5 A rating of the BY550-600, making it suitable for applications with lower current demands.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: The BY550-600 remains the preferred component for new designs and applications requiring 5 A rectified current capacity. The part maintains active production status with established supply availability and is suitable for long-term production commitments.

Substitute Selection Criteria: The 1N5406RLG is electrically compatible for applications where the average rectified current requirement does not exceed 3 A. This substitute is appropriate for legacy design support, repair applications, or situations where the BY550-600 experiences temporary supply unavailability.

Compliance Considerations: The 1N5406RLG carries ROHS3 compliance and REACH Unaffected status, whereas the BY550-600 lists RoHS status as not applicable. Design teams must verify that regulatory requirements for the end application are satisfied by the selected component.

Temperature Range Limitation: The 1N5406RLG operates to a maximum junction temperature of 150°C compared to 175°C for the BY550-600. Applications operating near the upper thermal limit of the BY550-600 must confirm that the 1N5406RLG's reduced temperature range remains acceptable.

Reverse Leakage: The 1N5406RLG exhibits 10 µA reverse leakage at 600 V compared to 5 µA for the BY550-600. Applications sensitive to leakage current must account for this parameter difference.

Frequently Asked Questions (FAQ)

Q: Can the 1N5406RLG directly replace the BY550-600 in all applications?

A: The 1N5406RLG is electrically and mechanically compatible with the BY550-600 only in applications where the average rectified current does not exceed 3 A. If the circuit requires the full 5 A capacity of the BY550-600, the 1N5406RLG is not suitable.

Q: Are the packages identical between BY550-600 and 1N5406RLG?

A: Both parts utilize DO-201AA axial through-hole packages. Physical dimensions and lead spacing are compatible, permitting direct board-level substitution without layout modifications.

Q: What is the significance of the "Not For New Designs" status on the 1N5406RLG?

A: This designation indicates that onsemi does not recommend the 1N5406RLG for new product development. The part remains available for existing design support and repair applications but should not be selected for designs entering production for the first time.

Q: How does the reverse leakage difference affect circuit performance?

A: The 1N5406RLG exhibits 10 µA reverse leakage compared to 5 µA for the BY550-600. In high-impedance circuits or precision applications, this doubled leakage current may introduce measurable effects. Standard rectification applications are typically unaffected by this parameter difference.

Q: Is the operating temperature range difference critical?

A: The 1N5406RLG operates to 150°C junction temperature versus 175°C for the BY550-600. Applications designed to operate near 175°C must confirm that the 1N5406RLG's 150°C limit is acceptable for the thermal environment.

Q: What compliance certifications apply to each part?

A: The BY550-600 lists RoHS status as not applicable. The 1N5406RLG is ROHS3 compliant and REACH unaffected. Design teams must verify that the selected part meets the regulatory requirements of the target market and application.