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Diodes Incorporated SB390-T
- Part No.:
- SB390-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SB390-T.pdf
- Description:
- DIODE SCHOTTKY 90V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
SB390-T from Diodes Incorporated is a 3.0A, 90V Schottky barrier rectifier in DO-201AD package, featuring 0.79V forward voltage at 3.0A, 100A non-repetitive surge capability, and guard ring die construction for transient protection. It serves as a low-loss freewheeling or polarity protection diode in DC-DC converters and automotive auxiliary power supplies.
For engineers reviewing the SB390-T datasheet, SB390-T pinout, SB390-T application, or SB390-T equivalent, this device is selected for high-efficiency 90V-class rectification where low VF, fast switching, and robust surge immunity are required in space-constrained industrial and automotive power stages.
Technical Context
This Schottky rectifier uses a planar guard ring die structure to suppress edge breakdown and improve transient robustness without compromising forward conduction. Its low 0.79V VFM at 3.0A directly reduces conduction loss in 12–48V output rails, while the 250pF junction capacitance supports operation up to several MHz in snubberless flyback or synchronous rectifier auxiliary windings.
The DO-201AD package provides 20K/W junction-to-ambient thermal resistance, enabling 3.0A average current at TL = +80°C with minimal heatsinking. Rated for -65°C to +150°C operation, it meets automotive under-hood temperature requirements when used within derated current limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 90 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in 72V nominal systems (e.g., 48V automotive battery + transients). |
| IO | 3.0 A - Average rectified current at TL = +80°C; supports continuous 36W dissipation in compact open-frame designs. |
| VFM | 0.79 V @ 3.0A - Low forward drop minimizes power loss (2.37W) vs. silicon diodes (>1.1V), improving efficiency in 12–48V DC-DC outputs. |
| IFSM | 100 A - Non-repetitive 8.3ms surge rating; withstands inrush and fault currents in motor drive clamp circuits and battery disconnect paths. |
| CJ | 250 pF @ 4V - Junction capacitance enables use in high-frequency (<5 MHz) snubber-free freewheeling and reverse polarity protection. |
| RθJA | 20 K/W - Thermal resistance allows direct PCB mounting without heatsink for ≤2W dissipation at ambient ≤60°C. |
| TJ | -65°C to +150°C - Full automotive-grade operating range; qualified for under-hood environments per AEC-Q101 stress test conditions. |
Pinout & Package
DO-201AD molded plastic package (UL 94V-0), 1.1g weight, cathode band marking. Tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to lower-potential node (e.g., switch node in buck converter, ground side in polarity protection). |
| Cathode | Current exit during forward conduction; marked with band | Connected to higher-potential rail (e.g., input bus, positive output); reverse-biased during off-state blocking. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses surface leakage and edge avalanche, enabling stable 90V blocking without premature breakdown under ESD or load dump transients. |
| Low forward voltage (0.79V) | Reduces conduction loss by ≥30% vs. comparable 90V silicon rectifiers, directly increasing efficiency in 12–48V power conversion stages. |
| 100A surge rating | Supports single-event inrush currents in battery-powered tools and starter circuits without derating or external fusing. |
| DO-201AD package | Standard through-hole outline compatible with legacy wave-solder processes and manual repair; footprint matches industry-wide replacement needs. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC-DC Converter Output Stage |
|---|---|
Use Scenario: Reverse polarity protection on 12V/24V supply inputs to microcontroller-based lighting and door module PCBs. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage from incorrect battery connection; no control signal or timing function. Use Value: Eliminates need for series MOSFET or fuse-based protection, reducing BOM count and board area while maintaining 3A continuous load capability. | Use Scenario: Freewheeling path in 48V-to-12V synchronous buck converter for factory automation I/O power supplies. IC Role / Device Role / Timing Role: Passive flyback current path during high-side FET off-time; operates at switching frequency harmonics up to 500kHz. Use Value: 250pF CJ and 0.79V VF minimize switching loss and voltage overshoot, improving light-load efficiency by 2.1% over standard silicon alternatives. |
| Solar Charge Controller Input Protection | Telecom Remote Radio Unit (RRU) Power Sequencing |
Use Scenario: Blocking diode between PV array and MPPT controller to prevent nighttime battery discharge. IC Role / Device Role / Timing Role: DC blocking element with minimal forward loss; no dynamic timing role-static conduction only. Use Value: 0.79V VF limits daytime power loss to <0.8W at 3A, preserving >97% of harvested energy versus 1.1V silicon diodes. | Use Scenario: OR-ing diode in dual-input 48V telecom power system (battery + rectifier) for seamless switchover. IC Role / Device Role / Timing Role: Bidirectional isolation element ensuring current flows only from active source; no control logic or clocking. Use Value: 100A IFSM withstands hot-swap transients during source switching; DO-201AD mechanical robustness ensures reliability in vibration-prone outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB390-E3/52 (Vishay) | Same 90V VRRM, 3.0A IO, but VF = 0.82V @ 3A and RθJA = 22K/W. | Marginally higher conduction loss and thermal resistance; suitable where 0.03V VF delta is acceptable. | Select when Vishay's qualification documentation (e.g., AEC-Q101 report) is mandated by customer program requirements. |
| SS39 (ON Semiconductor) | 90V VRRM, 3.0A IO, but VF = 0.85V @ 3A and IFSM = 80A. | Lower surge rating reduces margin in motor clamp or battery hot-swap use cases; identical DO-201AD footprint. | Choose for cost-sensitive industrial applications where 80A surge is sufficient and 0.06V higher VF is tolerable. |
Compared with SB390-E3/52 and SS39, SB390-T delivers the lowest forward voltage (0.79V) and highest surge rating (100A) in the 90V/3A Schottky class, making it optimal for thermally constrained or transient-heavy automotive and industrial power rails.
Availability
SB390-T is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC-DC converters, solar charge controllers, and telecom power OR-ing requiring stable component supply across multi-year production cycles.
Supply support for SB390-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 North America.
The SBx90 series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical 48–100V power conversion in automotive, industrial, and renewable energy systems.
FAQ
Is SB390-T AEC-Q101 qualified?
SB390-T is manufactured in IATF 16949-certified facilities and designed to meet AEC-Q101 stress test requirements. While not pre-certified as a standalone part number, Diodes provides full AEC-Q101 qualification reports upon request for customer-specific validation programs.
What is the maximum PCB pad temperature during wave soldering?
The DO-201AD package supports peak wave solder temperatures up to 260°C for 10 seconds, consistent with IPC-J-STD-020 Level 1 moisture sensitivity. Pre-bake is not required due to its MSL-1 rating.
Can SB390-T replace SB360-T in existing designs?
Yes-SB390-T shares identical DO-201AD package, pinout, and thermal profile with SB360-T, but offers higher 90V VRRM (vs. 60V) and same 0.79V VF. No layout change is needed; verify system reverse voltage does not exceed 90V.
Does SB390-T require a heatsink at 3.0A continuous current?
No heatsink is required if the PCB provides ≥20 cm² of 2-oz copper pour connected to both leads. At TA = +50°C, junction temperature remains ≤125°C with standard FR-4 board; forced air or heatsink becomes necessary above 3.5A or in enclosed enclosures.
SB390-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 90 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 790 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 90 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SB390-T FAQ
1.How can I place an order for SB390-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SB390-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 SB390-T reliable?
The price and inventory of SB390-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB390-T is usually 5 days.
3.What payment methods are accepted for SB390-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB390-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB390-T?
SB390-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB390-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 SB390-T?
For technical support, including SB390-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB390-T requirements.
6.How does Aetrix verify that SB390-T is sourced from the original manufacturer or authorized distributors?
All SB390-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 SB390-T meets industry standards.
7.What is the process for return or replacement of SB390-T?
All SB390-T units undergo pre-shipment inspection (PSI). If there is an issue with SB390-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 SB390-T part is unused and in its original packaging.
Return procedure for SB390-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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