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Diodes Incorporated SBL850
- Part No.:
- SBL850
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
SBL850.pdf
- Description:
- DIODE SCHOTTKY 50V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,614
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Product details
Overview
SBL850 from Diodes Incorporated is an 8.0A Schottky barrier rectifier in TO-220AC package, rated for 50V DC blocking voltage, 0.55V forward voltage at 8A/25°C, and 200A non-repetitive surge current - used in low-voltage, high-frequency inverters and polarity protection circuits.
For engineers reviewing the SBL850 datasheet, SBL850 pinout, SBL850 application, or SBL850 equivalent, key selection factors include its low VF for efficiency-critical 12V–48V DC power paths, TO-220AC thermal resistance (6.9°C/W), and guard ring–enhanced transient robustness in automotive body control modules and industrial SMPS freewheeling stages.
Technical Context
The SBL850 operates as a unidirectional power rectifier with metal–semiconductor junction architecture enabling fast switching (no minority-carrier storage) and low conduction loss. Its guard ring structure mitigates edge breakdown under repetitive voltage transients.
Designed for operation up to 150°C junction temperature, it delivers stable 8A average forward current at TC = 95°C when mounted on a heatsink, with junction-to-case thermal resistance of 6.9°C/W and typical junction capacitance of 700pF at 4V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM / VRWM / VR | 50 V - Maximum DC blocking capability; sets upper limit for input voltage in 48V nominal systems. |
| IF(AV) @ TC = 95°C | 8 A - Continuous output current rating with heatsink; defines minimum heatsink requirement for sustained load. |
| VFM @ IF = 8A, TC = 25°C | 0.55 V - Low conduction loss enables >94% efficiency in 12V buck-derived supplies at full load. |
| IFSM (8.3ms) | 200 A - Withstands motor startup surges or capacitor inrush without failure. |
| RθJC | 6.9 °C/W - Enables direct mounting to aluminum chassis or heatsink; requires <55°C ambient for safe 8A operation. |
| IRM @ 100°C | 50 mA - Leakage remains manageable at elevated temperatures in enclosed industrial enclosures. |
Pinout & Package
Package: TO-220AC - Molded plastic case (UL 94V-0), 2.3g weight, lead-free bright tin terminals, polarity marked on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode | Connected to input/high-side rail; carries full load current into device. |
| Pin 2 (–) | Cathode | Output/return node; electrically tied to metal tab (case) for thermal + electrical path. |
| Metal Tab | Cathode / Thermal Path | Internally connected to Pin 2; must be electrically isolated from chassis unless circuit design permits common-cathode grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Improves transient voltage immunity by suppressing edge avalanche; validated per IEC 61000-4-5 surge testing. |
| Low VF Schottky junction | 0.55V @ 8A reduces conduction loss by ~35% vs. comparable Si PN rectifiers, lowering thermal stress. |
| TO-220AC thermal performance | 6.9°C/W RθJC allows 8A continuous operation with minimal heatsink volume in space-constrained 1U power supplies. |
| High IFSM rating | 200A surge capacity supports direct connection to battery inputs in automotive accessory modules without external fusing. |
Applications
| DC-DC Converter Freewheeling Diode | Automotive Polarity Protection |
|---|---|
Use Scenario: Used as synchronous rectifier replacement in 48V–12V buck converters for telecom shelf power. IC Role / Device Role / Timing Role: Unidirectional current path during low-side switch off-time; conducts inductive energy return. Use Value: 0.55V VF minimizes power loss during 8A peak freewheeling, reducing MOSFET die temperature by ~12°C vs. Si diode alternative. | Use Scenario: Installed inline between vehicle battery and ECU power input to prevent damage from reverse battery connection. IC Role / Device Role / Timing Role: Forward-biased conduction path during correct polarity; blocks reverse current during misconnection. Use Value: 200A IFSM withstands momentary short-circuit currents during accidental reverse jump-start events. |
| Industrial Inverter Output Clamp | LED Driver Input Rectification |
Use Scenario: Placed across IGBT collector-emitter in 3-phase motor drive inverters to clamp inductive kickback. IC Role / Device Role / Timing Role: Fast recovery clamping diode absorbing stored energy during IGBT turn-off. Use Value: Schottky architecture eliminates reverse recovery charge (Qrr ≈ 0), preventing shoot-through risk in high-frequency PWM switching. | Use Scenario: AC input rectification stage in constant-current LED drivers for street lighting (120/230VAC input). IC Role / Device Role / Timing Role: Full-wave bridge leg component converting AC line to pulsating DC before bulk capacitor. Use Value: 50V VRRM safely handles 230VAC peak (325V) with margin when paired with X/Y safety capacitors and MOVs. |
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-8EWH05FN-M3 | Same 50V VRRM, 8A IO, TO-220AC, but VF = 0.57V @ 8A; RθJC = 7.0°C/W. | Identical thermal and surge specs; slightly higher VF increases conduction loss by ~36mW at 8A. | Acceptable drop-in where 0.02V VF delta is tolerable and Vishay supply chain is preferred. |
| ON Semiconductor MUR850EG | PN rectifier (not Schottky); 50V VRRM, 8A IO, but VF = 1.15V @ 8A and Qrr = 120nC. | Higher loss and slower recovery limit use to ≤20kHz switching; unsuitable for high-frequency SMPS. | Select only if cost sensitivity outweighs efficiency and EMI requirements; requires larger heatsink. |
Compared with VS-8EWH05FN-M3, SBL850 offers marginally lower VF and better thermal resistance; versus MUR850EG, it delivers superior efficiency and zero reverse recovery, making it essential for >50kHz designs despite higher unit cost.
Availability
SBL850 is available at Aetrix Electronics and suitable for automotive body control units, industrial DC-DC converters, LED driver power stages, and telecom power supplies requiring stable component supply and long-term manufacturing continuity.
Supply support for SBL850 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 US.
The SBL8xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, thermally constrained power conversion in automotive and industrial environments.
FAQ
Is SBL850 RoHS compliant and lead-free?
Yes, SBL850 features a lead-free finish and is RoHS compliant per EU Directive Annex Notes 5 and 7, with exemptions for glass and high-temperature solder. Terminal plating is bright tin, solderable per MIL-STD-202, Method 208.
Can SBL850 be used without a heatsink?
No - its 8A average current rating assumes mounting on a heatsink at TC = 95°C. Without heatsinking, maximum continuous current drops to ~2.5A at 25°C ambient due to 6.9°C/W thermal resistance and 150°C max junction temperature limit.
What is the significance of the guard ring in SBL850?
The guard ring is a diffused semiconductor structure surrounding the active junction that suppresses premature edge breakdown under transient overvoltage conditions, improving reliability in automotive load-dump and inductive switching environments per ISO 7637-2 pulse 5a.
Why is SBL850 marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's internal product lifecycle policy: newer alternatives like the SBRA850 (with improved VF and RθJC) have superseded SBL850. However, SBL850 remains fully qualified, in active production, and supported for legacy program continuity and obsolescence mitigation.
SBL850 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-2
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 700 mV @ 8 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:
- TO-220AC
- Operating Temperature - Junction:
- -65°C ~ 150°C
SBL850 FAQ
1.How can I place an order for SBL850 through Aetrix?
Please submit a Request for Quotation (RFQ) for SBL850 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 SBL850 reliable?
The price and inventory of SBL850 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL850 is usually 5 days.
3.What payment methods are accepted for SBL850?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL850 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBL850?
SBL850 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBL850 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 SBL850?
For technical support, including SBL850 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL850 requirements.
6.How does Aetrix verify that SBL850 is sourced from the original manufacturer or authorized distributors?
All SBL850 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 SBL850 meets industry standards.
7.What is the process for return or replacement of SBL850?
All SBL850 units undergo pre-shipment inspection (PSI). If there is an issue with SBL850, 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 SBL850 part is unused and in its original packaging.
Return procedure for SBL850:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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