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Diodes Incorporated SB350-B
- Part No.:
- SB350-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SB350-B.pdf
- Description:
- DIODE SCHOTTKY 50V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,969
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Product details
Overview
SB350-B from Diodes Incorporated is a 3.0A, 50V Schottky barrier rectifier in DO-201AD package, featuring 0.74V forward voltage at 3.0A, 80A non-repetitive surge capability, and guard ring die construction for transient protection. It is used in low-voltage, high-frequency inverters, freewheeling diode circuits, and polarity protection in DC power supplies.
For engineers reviewing the SB350-B datasheet, SB350-B pinout, SB350-B application, or SB350-B equivalent, key selection criteria include its 50V VRRM rating, 0.74V VFM at rated current, thermal resistance (RθJA = 30°C/W), DO-201AD mechanical compatibility, and RoHS-compliant tin-plated terminals.
Technical Context
This Schottky rectifier uses a planar, guard ring–protected silicon die to suppress edge breakdown and improve surge robustness. Its low forward voltage minimizes conduction loss in high-efficiency 12–24V DC-DC and AC-DC secondary-side rectification.
The device operates across –65°C to +125°C junction temperature range with 10°C/W junction-to-lead thermal resistance under standard PCB mounting conditions. Its 35V RMS reverse voltage rating supports use in 24VAC input rectification with safety margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in 24V/48V bus polarity protection |
| IF(AV) | 3.0 A - Average forward current rating at TA = 25°C; derates linearly above 25°C per Figure 1 |
| VFM @ 3.0A | 0.74 V - Forward voltage drop at full rated current; determines conduction loss (2.22W at 3A) |
| IFSM | 80 A - Non-repetitive peak surge current (8.3ms half-sine); withstands inrush in SMPS output stages |
| RθJA | 30 °C/W - Junction-to-ambient thermal resistance; requires ≥63.5 mm × 63.5 mm copper pad for full 3A rating |
| IRM @ 25°C | 0.5 mA - Peak reverse leakage at rated VRRM; low leakage preserves efficiency in battery backup paths |
| Polarity | Cathode band - Identifies cathode terminal; critical for correct orientation in freewheeling and reverse-polarity protection |
Pinout & Package
DO-201AD axial-leaded plastic package with cathode band marking. Two-terminal device: anode and cathode. Lead finish: matte tin, solderable per MIL-STD-202 Method 208. Weight: 1.1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias | Connected to lower-potential side (e.g., switch node in buck converter or load ground in polarity protection) |
| Cathode | Current exit point under forward bias; marked with band | Connected to higher-potential rail (e.g., output capacitor positive or supply V+ in reverse-voltage clamp) |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses surface leakage and edge avalanche, enabling stable 80A surge performance without degradation |
| Low VFM (0.74V @ 3A) | Reduces forward power loss by ~35% vs. comparable 1N5822 (0.9V), improving thermal margin in compact layouts |
| DO-201AD package | Standard axial outline with 25.4mm lead spacing; compatible with legacy through-hole assembly and wave soldering |
| RoHS-compliant tin plating | Lead-free finish meeting EU Directive 2011/65/EU; eliminates post-solder cleaning for halogen-free fluxes |
Applications
| DC-DC Converter Output Rectification | Automotive Body Control Module Power Input |
|---|---|
Use Scenario: Secondary-side rectification in 12V-input buck converters delivering 3.3V/5V to microcontrollers and sensors. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side MOSFET off-time. Use Value: 0.74V VFM reduces conduction loss to 2.22W at 3A, lowering heatsink requirements versus higher-VF alternatives. | Use Scenario: Reverse-polarity protection at 12V battery input of BCM modules exposed to service wiring errors. IC Role / Device Role / Timing Role: Series-connected blocking diode preventing damage when battery terminals are reversed. Use Value: 50V VRRM provides 2× margin over 12V automotive transients (ISO 7637-2 Pulse 1/2a), ensuring reliability. |
| Industrial AC-DC Adapter Secondary Side | LED Driver Freewheeling Path |
Use Scenario: Output rectification in 24VAC-to-DC adapters powering PLC I/O modules. IC Role / Device Role / Timing Role: Half-wave rectifier converting transformer secondary AC to unregulated DC bus. Use Value: 35V VR(RMS) rating matches 24VAC input with safety margin; low IRM (<0.5mA) prevents standby power drain. | Use Scenario: Freewheeling path in boost-type constant-current LED drivers operating at 100–500kHz switching frequency. IC Role / Device Role / Timing Role: Fast-recovery path for inductor current when switch turns off. Use Value: Schottky architecture enables <10ns reverse recovery, eliminating switching loss spikes seen with PN diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB350-T | Same die and specs; packaged in 1200/reel tape-and-reel format instead of 500/bulk | Optimized for automated SMT placement (though DO-201AD is axial); not suitable for manual prototyping | Select SB350-T for high-volume production lines using pick-and-place; SB350-B for hand-soldered prototypes or low-volume builds |
| SS35 | 3A/50V Schottky in SMB package; VFM = 0.7V @ 3A; RθJA = 45°C/W; no guard ring | Surface-mount alternative; lower surge rating (50A IFSM); unsuitable for high-transient industrial environments | Choose SS35 only if board space constraints require SMD; accept reduced surge immunity and higher thermal resistance |
Compared with SB350-T, SB350-B offers identical electrical performance but enables manual handling and small-batch assembly; versus SS35, it delivers superior surge robustness and thermal dissipation in through-hole layouts, making it preferred for ruggedized power designs.
Availability
SB350-B is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive body control module power input, and industrial AC-DC adapter secondary-side applications requiring stable component supply and long-term manufacturability.
Supply support for SB350-B 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 and manufacturing operations across Asia and the Americas.
The SBx50 series belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-reliability power conversion in industrial, automotive, and consumer power supplies.
FAQ
What is the maximum junction temperature for SB350-B?
The SB350-B has a maximum operating junction temperature of +125°C, as specified in the Thermal Characteristics table. This limit applies under continuous DC operation with proper PCB thermal management-specifically, a 63.5 mm × 63.5 mm copper pad per the test condition for RθJA = 30°C/W. Exceeding this temperature risks parametric shift and accelerated failure.
Can SB350-B be used in place of SB340-B?
SB350-B (50V VRRM) can replace SB340-B (40V VRRM) in most designs where reverse voltage margin is required, provided layout and thermal design accommodate identical package and current ratings. However, the higher VRRM does not reduce forward voltage-it remains 0.74V at 3A-so conduction loss is unchanged. Verify that system transients do not exceed 50V before substitution.
Is SB350-B suitable for synchronous rectification?
No. SB350-B is a passive Schottky rectifier and cannot be actively controlled like a MOSFET-based synchronous rectifier. It lacks gate drive capability and is intended for self-commutated freewheeling or rectification roles. For synchronous designs, discrete N-channel MOSFETs (e.g., DMN3025LSD) with external gate control must be used instead.
Does SB350-B meet automotive AEC-Q101 qualification?
No. SB350-B is not AEC-Q101 qualified. The datasheet specifies only commercial/industrial temperature range (–65°C to +125°C) and references JEDEC J-STD-020 moisture sensitivity level 1. For automotive applications requiring AEC-Q101, consider Diodes' APx50 series (e.g., AP350WQ) or other qualified Schottky rectifiers explicitly listed in AEC-Q101 stress reports.
SB350-B 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):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 740 mV @ 3 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
SB350-B FAQ
1.How can I place an order for SB350-B through Aetrix?
Please submit a Request for Quotation (RFQ) for SB350-B 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 SB350-B reliable?
The price and inventory of SB350-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SB350-B is usually 5 days.
3.What payment methods are accepted for SB350-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SB350-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SB350-B?
SB350-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SB350-B 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 SB350-B?
For technical support, including SB350-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SB350-B requirements.
6.How does Aetrix verify that SB350-B is sourced from the original manufacturer or authorized distributors?
All SB350-B 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 SB350-B meets industry standards.
7.What is the process for return or replacement of SB350-B?
All SB350-B units undergo pre-shipment inspection (PSI). If there is an issue with SB350-B, 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 SB350-B part is unused and in its original packaging.
Return procedure for SB350-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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