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Diodes Incorporated SBL840
- Part No.:
- SBL840
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
SBL840.pdf
- Description:
- DIODE SCHOTTKY 40V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,196
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Product details
Overview
SBL840 from Diodes Incorporated is an 8.0A, 40V Schottky barrier rectifier in TO-220AC package, designed for low-voltage, high-frequency inverters, freewheeling, and polarity protection circuits. It features a forward voltage of 0.55V at 8A/25°C, 200A non-repetitive surge capability, and 6.9°C/W junction-to-case thermal resistance.
For engineers reviewing the SBL840 datasheet, SBL840 pinout, SBL840 application, or SBL840 equivalent, key selection criteria include its 40V blocking rating, low VF for efficiency-critical DC-DC outputs, TO-220AC thermal performance on heatsinks, and RoHS-compliant bright tin terminals.
Technical Context
The SBL840 uses a Schottky barrier die with integrated guard ring for transient protection, enabling fast switching and low reverse recovery charge-critical for high-frequency rectification in SMPS secondary-side outputs and synchronous rectifier auxiliary paths.
Its 700pF junction capacitance at 4V reverse bias and -65°C to +150°C operating range support stable operation in automotive under-hood and industrial power supplies where thermal cycling and EMI immunity are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe DC bus margin for 24V/36V systems. |
| IF(AV) | 8 A @ TC = 95°C - Continuous output current when mounted on heatsink; defines minimum heatsink requirement. |
| VFM | 0.55 V @ 8A, 25°C - Low conduction loss enables >92% efficiency in 5–12V output stages. |
| IFSM | 200 A (8.3ms half-sine) - Withstands inrush surges during hot-plug or capacitor charging without failure. |
| RθJC | 6.9 °C/W - Enables direct thermal coupling to heatsink; allows ~11W dissipation at ΔT = 75°C. |
| Cj | 700 pF @ 1MHz, 4V - Limits high-frequency displacement current; reduces EMI in >100kHz converters. |
Pinout & Package
Package: TO-220AC - Molded plastic case (UL 94V-0), 2.3g weight, with metal tab electrically connected to Pin 1 (+) for direct heatsink mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Tab) | Anode (+) | Electrically tied to metal tab; must be isolated from heatsink unless circuit reference requires common-anode configuration. |
| Pin 2 | Cathode (–) | Output return path; carries full load current and requires low-inductance PCB routing to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances transient voltage immunity (dV/dt > 1000 V/μs) without external snubbers in motor drive freewheeling. |
| Low VF Schottky die | Reduces conduction loss by ~40% vs. standard PN rectifiers at 8A, lowering thermal stress in compact enclosures. |
| Bright tin terminations | Ensures reliable solder wetting per MIL-STD-202 Method 208; supports lead-free reflow profiles up to 260°C peak. |
| TO-220AC mechanical robustness | Withstands >50g vibration per MIL-STD-202 Method 213; suitable for industrial power modules and railway converters. |
Applications
| DC-DC Converter Secondary Rectification | Automotive Body Control Module Power Supply |
|---|---|
Use Scenario: 12V input to 3.3V/5V buck converter in infotainment head unit. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectifier auxiliary path, clamping inductive kickback during high-side switch off-time. Use Value: 0.55V VF minimizes power loss at 6A load, reducing heatsink size by 35% versus 1N5822. | Use Scenario: Reverse-polarity protection at 24V battery input of BCM ECU. IC Role / Device Role / Timing Role: Series-connected anode-to-battery+ rectifier blocking reverse connection during jump-start events. Use Value: 200A IFSM withstands 150A jump-start surge without degradation; TO-220AC tab anchors to chassis ground. |
| Industrial Motor Drive Freewheeling | LED Driver Output Stage |
Use Scenario: 48V BLDC inverter half-bridge leg with regenerative braking. IC Role / Device Role / Timing Role: Freewheeling path for phase-current decay during PWM off-periods; handles bidirectional current spikes. Use Value: Guard ring suppresses avalanche-induced latch-up during 600V bus transients; 700pF Cj limits capacitive coupling noise. | Use Scenario: Constant-current LED string driver with 36V output and 2A load. IC Role / Device Role / Timing Role: Output rectifier in flyback secondary, conducting continuous 2A while rejecting 50kHz switching noise. Use Value: 6.9°C/W RθJC enables passive cooling at 1.1W dissipation; 40V VRRM provides 2× safety margin over 18V LED string. |
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-8EWH04FN-M3 | 40V, 8A, TO-220AC, VF = 0.54V @ 8A but higher IRM (1.0mA @ 40V) and lower IFSM (175A). | Less robust against sustained reverse leakage in high-temp environments (>100°C ambient). | Prefer SBL840 where surge immunity and low IRM dominate; choose VS-8EWH04FN-M3 only if cost sensitivity outweighs reliability margin. |
| ON Semiconductor MUR840EG | 400V, 8A ultrafast PN rectifier in TO-220AC; VF = 1.7V @ 8A, RθJC = 5.0°C/W. | Higher conduction loss increases thermal load; used only where higher VRRM or avalanche ruggedness is mandatory. | Select only if system requires >100V reverse blocking; otherwise SBL840 delivers 65% lower conduction loss at same current. |
Compared with VS-8EWH04FN-M3 and MUR840EG, the SBL840 offers superior surge tolerance and lower leakage-making it optimal for automotive and industrial freewheeling where transient resilience and thermal stability are prioritized over absolute lowest VF or highest VRRM.
Availability
SBL840 is available at Aetrix Electronics and suitable for DC-DC converter secondary rectification, automotive body control module power supply, and industrial motor drive freewheeling requiring stable component supply and long-term manufacturability planning.
Supply support for SBL840 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
The SBL8xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, thermally constrained power conversion in automotive, industrial, and computing applications.
FAQ
Is SBL840 RoHS compliant and lead-free?
Yes, SBL840 features bright tin terminations and is RoHS compliant per EU Directive Annex Notes 5 and 7, with exemptions for glass and high-temperature solder. It meets J-STD-020C Level 1 moisture sensitivity and supports lead-free reflow profiles up to 260°C peak temperature.
Can SBL840 be used without a heatsink?
No-its 8A average current rating assumes TC = 95°C with adequate heatsinking. At ambient temperatures above 40°C or without thermal interface material and ≥15 cm² aluminum heatsink, junction temperature exceeds 150°C, risking premature failure. Derating curves in Figure 1 must be strictly followed.
What is the electrical relationship between Pin 1 (tab) and Pin 2?
Pin 1 (metal tab) is the anode (+); Pin 2 is the cathode (–). The tab is electrically connected to the anode die, so isolation hardware (e.g., shoulder washers, insulating pads) is required when mounting to a grounded heatsink unless the circuit topology demands common-anode referencing.
Why is SBL840 marked "NOT RECOMMENDED FOR NEW DESIGN"?
This designation reflects Diodes Incorporated's internal roadmap: newer alternatives like the SBRA840 (with improved VF and lower IRM) have superseded SBL840. However, SBL840 remains fully qualified, in active production, and supported for legacy program continuity and repair-no obsolescence risk is indicated in current datasheets or distributor stock.
SBL840 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):
- 40 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -65°C ~ 150°C
SBL840 FAQ
1.How can I place an order for SBL840 through Aetrix?
Please submit a Request for Quotation (RFQ) for SBL840 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 SBL840 reliable?
The price and inventory of SBL840 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL840 is usually 5 days.
3.What payment methods are accepted for SBL840?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL840 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBL840?
SBL840 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBL840 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 SBL840?
For technical support, including SBL840 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL840 requirements.
6.How does Aetrix verify that SBL840 is sourced from the original manufacturer or authorized distributors?
All SBL840 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 SBL840 meets industry standards.
7.What is the process for return or replacement of SBL840?
All SBL840 units undergo pre-shipment inspection (PSI). If there is an issue with SBL840, 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 SBL840 part is unused and in its original packaging.
Return procedure for SBL840:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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