SB550 Schottky Diode 50V 5A DO-201AD Equivalent & Substitute Parts

Part Overview

The SB550 is a Schottky rectifier diode manufactured by onsemi, rated for 50V DC reverse voltage and 5A average rectified current in a DO-201AD axial through-hole package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The SB550 operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency rectification applications.

Substiute Parts

SB550

onsemiIn Stock: 1097SB550 Datasheet

Current PartRFQ

SB550-T

Diodes IncorporatedIn Stock: 30146SB550-T Datasheet

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SR504

Taiwan Semiconductor CorporationIn Stock: 2382SR504 Datasheet

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SR504-AP

Micro Commercial CoIn Stock: 1166SR504-AP Datasheet

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SR504-BP

Micro Commercial CoIn Stock: 1105SR504-BP Datasheet

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SR504-TP

Micro Commercial CoIn Stock: 1093SR504-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SB550 are classified into two categories based on electrical parameter alignment:

Upgrade Substitute (Direct Replacement): The SB550-T manufactured by Diodes Incorporated maintains identical electrical specifications for voltage rating (50V), current rating (5A), forward voltage drop (670 mV @ 5A), and fast recovery speed characteristics. This part is classified as active product status and provides extended lower operating temperature capability (-65°C minimum versus -55°C). The SB550-T is the primary direct replacement option.

Similar Substitutes (Voltage-Derated Alternatives): The SR504, SR504-AP, SR504-BP, and SR504-TP variants are manufactured by Taiwan Semiconductor Corporation and Micro Commercial Co respectively. These parts operate at a reduced maximum reverse voltage rating of 40V compared to the SB550's 50V specification. All maintain the 5A current rating and fast recovery characteristics. The SR504 variants exhibit lower forward voltage drop (550 mV @ 5A) and are available in active product status. The SR504-AP, SR504-BP, and SR504-TP variants from Micro Commercial Co feature higher reverse leakage current (1 mA @ 40V versus 500 µA @ 50V) and lower junction temperature minimum (-50°C versus -55°C).

Substitution eligibility is determined by:

• Matching or exceeding reverse voltage rating (50V minimum for direct replacement; 40V acceptable only for applications not exceeding 40V)
• Matching or exceeding current rating (5A minimum)
• Compatible package and mounting type (DO-201AD through-hole axial)
• Acceptable forward voltage drop characteristics for circuit operation

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SB550-T (Diodes Incorporated)

The SB550-T is the recommended direct replacement for the obsolete SB550. This part maintains full electrical equivalence across all critical parameters: 50V reverse voltage rating, 5A current capacity, 670 mV forward voltage drop at 5A, and fast recovery characteristics. The SB550-T is classified as active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications. The SB550-T provides extended lower temperature operation (-65°C minimum) compared to the SB550 (-55°C minimum), offering improved performance margin in low-temperature environments.

Secondary Selection: SR504 (Taiwan Semiconductor Corporation)

The SR504 is suitable for applications where the circuit design operates exclusively at or below 40V reverse voltage. This part maintains the 5A current rating and fast recovery speed characteristics. The SR504 exhibits a lower forward voltage drop (550 mV @ 5A) compared to the SB550, resulting in reduced power dissipation. The SR504 is active product status and ROHS3 compliant. Applications must confirm that the 40V voltage rating does not exceed circuit requirements before selection.

Tertiary Selection: SR504-AP, SR504-BP, SR504-TP (Micro Commercial Co)

These variants are functionally equivalent to the SR504 with identical electrical specifications at 40V reverse voltage and 5A current rating. These parts are active product status. The SR504-AP, SR504-BP, and SR504-TP exhibit higher reverse leakage current (1 mA @ 40V) compared to the SB550 (500 µA @ 50V) and SR504 (500 µA @ 40V). Applications sensitive to leakage current performance should prioritize the SR504 over these variants. These parts maintain compatibility with the DO-201AD through-hole package and axial mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can the SB550-T be used as a direct replacement for the SB550 in all applications?

A: Yes. The SB550-T maintains identical electrical specifications for reverse voltage (50V), forward current (5A), forward voltage drop (670 mV @ 5A), and recovery speed characteristics. Both parts use the DO-201AD through-hole axial package. The SB550-T is active product status, providing supply continuity for the obsolete SB550.

Q: What is the key difference between the SB550 and SR504 variants?

A: The primary difference is the maximum reverse voltage rating. The SB550 is rated for 50V reverse voltage, while the SR504 and its variants (SR504-AP, SR504-BP, SR504-TP) are rated for 40V. All maintain 5A current capacity and fast recovery characteristics. The SR504 variants exhibit lower forward voltage drop (550 mV versus 670 mV at 5A) and higher reverse leakage current (1 mA versus 500 µA).

Q: Can SR504 variants be used in circuits designed for the SB550?

A: SR504 variants are suitable only if the circuit operates at or below 40V reverse voltage. If the circuit design requires 50V reverse voltage capability, the SB550-T is the appropriate selection. Exceeding the 40V rating of SR504 variants will result in component failure.

Q: What are the packaging differences among substitute parts?

A: All substitute parts use the DO-201AD through-hole axial package, maintaining mechanical compatibility with the SB550. The SB550-T is supplied in Cut Tape (CT) packaging. The SR504 is supplied in Tape & Reel (TR) packaging. The SR504-AP, SR504-BP, and SR504-TP are supplied in Bulk packaging. These packaging differences do not affect electrical performance or mechanical fit.

Q: Are all substitute parts RoHS compliant?

A: The SB550-T and SR504 are explicitly ROHS3 compliant. The SR504-AP, SR504-BP, and SR504-TP variants do not specify RoHS status in the provided data. Applications requiring RoHS compliance should prioritize the SB550-T or SR504.

Q: What is the temperature operating range difference between the SB550 and its substitutes?

A: The SB550 operates from -55°C to 150°C junction temperature. The SB550-T extends the lower limit to -65°C, providing improved low-temperature performance. The SR504 operates from -55°C to 125°C, with a reduced upper temperature limit. The SR504-AP, SR504-BP, and SR504-TP operate from -50°C to 150°C. Application temperature requirements should guide selection.

Q: How does forward voltage drop affect circuit performance?

A: The SB550 and SB550-T exhibit 670 mV forward voltage drop at 5A. The SR504 and its variants exhibit 550 mV forward voltage drop at 5A. Lower forward voltage drop reduces power dissipation and heat generation. Applications with tight thermal budgets may benefit from the lower forward voltage drop of SR504 variants, provided the 40V voltage rating is acceptable.

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

A: The SB550 exhibits 500 µA reverse leakage at 50V. The SR504 exhibits 500 µA reverse leakage at 40V. The SR504-AP, SR504-BP, and SR504-TP exhibit 1 mA reverse leakage at 40V. Higher reverse leakage current increases standby power consumption and heat generation. Applications sensitive to leakage performance should prioritize parts with lower leakage specifications.