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Diodes Incorporated SB550-T
- Part No.:
- SB550-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SB550-T.pdf
- Description:
- DIODE SCHOTTKY 50V 5A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:910
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Product details
Overview
SB550-T from Diodes Incorporated is a 50V, 5.0A Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.55V @ 5A), 150A non-repetitive surge capability, and guard ring die construction for transient protection-used in low-voltage DC/DC converter output stages and polarity protection circuits.
For engineers reviewing the SB550-T datasheet, SB550-T pinout, SB550-T application, or SB550-T equivalent, key selection criteria include VRRM=50V, IF(AV)=5.0A, VFM=0.55V at rated current, thermal resistance RθJL=8°C/W, and DO-201AD mechanical compatibility with high-density PCB layouts.
Technical Context
This Schottky rectifier employs epitaxial construction to minimize forward conduction loss and maximize switching speed. Its guard ring die structure enhances ruggedness against voltage transients without external clamping components.
Rated for continuous operation from –65°C to +150°C junction temperature, it supports high-frequency rectification up to several hundred kHz in SMPS secondary-side applications, with thermal performance optimized for vertical lead mounting on P.C.B. (RθJL = 8°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 48V system polarity protection. |
| IF(AV) | 5.0 A - Average forward current rating at TA=25°C with adequate heatsinking; defines continuous power delivery capacity. |
| VFM | 0.55 V @ 5.0A - Low forward voltage drop reduces conduction loss by ~30% vs. standard PN diodes, improving efficiency in 5–12V outputs. |
| IFSM | 150 A - Non-repetitive peak surge current (8.3ms half-sine); withstands inrush during hot-plug or capacitor charging events. |
| RθJL | 8 °C/W - Junction-to-lead thermal resistance; enables direct thermal path to PCB copper for passive cooling in compact converters. |
| TJ Range | –65°C to +150°C - Extended junction temperature range supports under-hood automotive and industrial ambient conditions. |
Pinout & Package
DO-201AD molded plastic case with axial leads; cathode identified by band marking; weight ≈1.1 g; UL 94V-0 flammability rating; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side; accepts up to 5A continuous; requires minimum 1.5mm trace width for thermal relief. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to load/ground; must be isolated from other nets at ≥50V potential during reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves transient immunity without adding TVS devices-reduces BOM count in 12V automotive accessory modules. |
| Low VFM (0.55V @ 5A) | Reduces power dissipation to ≤2.75W at full load, enabling smaller heatsinks or fanless operation in space-constrained adapters. |
| 150A IFSM rating | Survives cold-start surges in battery-powered systems with large bulk capacitance (e.g., 1000µF+ at 48V). |
| DO-201AD package | Standardized axial footprint compatible with legacy wave-solder and automated tape-and-reel pick-and-place (1.2K/reel, 13″ reel). |
Applications
| DC/DC Converter Output Rectification | Polarity Protection Circuit |
|---|---|
Use Scenario: Secondary-side rectification in 5–12V isolated flyback or forward converters powering FPGA I/O rails. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC to regulated DC; no timing function. Use Value: 0.55V VFM minimizes conduction loss, raising efficiency from 88% to 91% at 5A load versus comparable 60V Schottky alternatives. | Use Scenario: Reverse-voltage blocking in 24V industrial control inputs connected to field wiring. IC Role / Device Role / Timing Role: Passive polarity guard; conducts only when input is correctly oriented; no active control or timing. Use Value: Withstands 50V reverse bias continuously and 150A surge transients from induced lightning strikes on long cables. |
| Free-Wheeling Diode | Low-Voltage Inverter Output Stage |
Use Scenario: Flyback path for inductive loads (e.g., solenoids, relays) in PLC output modules. IC Role / Device Role / Timing Role: Energy recirculation path during MOSFET turn-off; fast recovery avoids voltage spikes. Use Value: Schottky architecture eliminates minority-carrier storage delay, limiting VDS spike to <60V in 24V systems with 100mH coils. | Use Scenario: Output stage in 48V-to-12V bi-directional inverters for energy storage systems. IC Role / Device Role / Timing Role: Synchronous rectification element paired with gate driver; operates at 100kHz switching frequency. Use Value: RθJL=8°C/W allows direct thermal coupling to copper pour, maintaining TJ<110°C at 5A/100kHz without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-50SQ045 | VRRM=45V, VFM=0.52V @ 5A, same DO-201AD package | Lower blocking voltage limits use in 48V systems requiring margin; slightly lower VFM improves light-load efficiency | Select when 45V rating suffices and sub-0.53V VFM is prioritized over 50V headroom |
| ON Semiconductor SB550 | Identical electrical specs and DO-201AD package; different branding and traceability chain | No functional difference; used interchangeably where dual-sourcing is required per OEM procurement policy | Choose for supply chain diversification without design requalification |
Compared with VS-50SQ045 and SB550, the SB550-T offers guaranteed 50V VRRM margin for 48V nominal systems, consistent 0.55V VFM across production lots, and Diodes Incorporated's AEC-Q101-qualified manufacturing process for automotive-grade reliability.
Availability
SB550-T is available at Aetrix Electronics and suitable for DC/DC converter output rectification, polarity protection circuits, free-wheeling diode implementations, and low-voltage inverter output stages requiring stable component supply and tape-and-reel automation compatibility.
Supply support for SB550-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SB5xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical secondary-side power conversion and robust reverse-polarity protection in industrial and automotive environments.
FAQ
What is the maximum junction temperature for continuous operation of SB550-T?
The SB550-T has a specified operating junction temperature range of –65°C to +150°C. For continuous rated current (5.0A), thermal design must ensure junction temperature remains ≤150°C, typically achieved using RθJL=8°C/W with adequate PCB copper area or minimal heatsinking.
Is SB550-T compliant with RoHS and halogen-free requirements?
Yes, SB550-T features a lead-free finish and is RoHS 3 compliant (2015/863/EU), with exemptions applied as permitted. It also meets Diodes Incorporated's "Green" definition: antimony- and halogen-free, per their quality documentation at diodes.com/quality/lead-free.
Can SB550-T replace SB540-T in an existing design?
Yes, SB550-T can directly replace SB540-T where 50V VRRM is acceptable instead of 40V. The higher blocking voltage adds safety margin in 36–48V systems, while identical package, pinout, and thermal characteristics ensure drop-in compatibility without layout changes.
What is the meaning of the 'T' suffix in SB550-T?
The 'T' suffix denotes tape-and-reel packaging: 1.2K units per 13-inch reel, optimized for automated SMT assembly. This differs from 'A' (1K ammo pack) and 'B' (500-unit bulk), with identical electrical and mechanical specifications across all variants.
SB550-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 670 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SB550-T FAQ
1.How can I place an order for SB550-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB550-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SB550-T reliable?
The price and inventory of SB550-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB550-T is usually 5 days.
3.What payment methods are accepted for SB550-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB550-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB550-T?
SB550-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB550-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SB550-T?
For technical support, including SB550-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB550-T requirements.
6.How does Aetrix verify that SB550-T is sourced from the original manufacturer or authorized distributors?
All SB550-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SB550-T meets industry standards.
7.What is the process for return or replacement of SB550-T?
All SB550-T units undergo pre-shipment inspection (PSI). If there is an issue with SB550-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SB550-T part is unused and in its original packaging.
Return procedure for SB550-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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