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Diodes Incorporated SBL845
- Part No.:
- SBL845
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
SBL845.pdf
- Description:
- DIODE SCHOTTKY 45V 8A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,749
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Product details
Overview
SBL845 from Diodes Incorporated is an 8.0A, 45V Schottky barrier rectifier in TO-220AC package, featuring low forward voltage (0.55V @ 8A, 25°C), high surge capability (200A, 8.3ms), and thermal resistance of 6.9°C/W - deployed in low-voltage DC-DC converters, freewheeling diodes for synchronous buck stages, and polarity protection circuits in industrial power supplies.
For engineers reviewing the SBL845 datasheet, SBL845 pinout, SBL845 application, or SBL845 equivalent, key selection criteria include its 45V blocking rating, 0.55V forward drop at full rated current, junction-to-case thermal resistance, TO-220AC mechanical footprint compatibility, and transient robustness via integrated guard ring structure.
Technical Context
The SBL845 operates as a unidirectional power rectifier with metal–semiconductor junction architecture optimized for high-frequency switching topologies. Its guard ring design suppresses edge breakdown during voltage transients, while the low VF enables reduced conduction losses in 12V/24V input power stages.
Rated for 8A average forward current at TC = 95°C with derating to zero at ~150°C case temperature, it delivers stable performance under pulsed load conditions up to 200A peak surge, validated per JEDEC JESD22-A114 standard for non-repetitive half-sine wave stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse voltage before avalanche breakdown; defines safe operating margin in 36V nominal systems. |
| IF(AV) | 8 A @ TC = 95°C - Continuous DC output current capability when mounted on heatsink; requires minimum 12 cm² copper area for thermal compliance. |
| VFM | 0.55 V @ IF = 8A, TC = 25°C - Low conduction loss reduces power dissipation by ~4.4W vs. silicon diode alternatives at same current. |
| IFSM | 200 A, 8.3 ms - Peak surge withstand without degradation; supports inrush current limiting in SMPS startup sequences. |
| RθJC | 6.9 °C/W - Thermal resistance from junction to case; enables direct heatsink mounting without thermal interface material for moderate-power designs. |
| Cj | 700 pF @ VR = 4V, 1MHz - Junction capacitance impacts reverse recovery noise and EMI in high-dV/dt environments. |
Pinout & Package
Package: TO-220AC - Three-terminal through-hole plastic package with isolated metal tab (Pin 1 = Anode, Pin 2 = Cathode, Case = Anode). Mounting hole centered on tab for mechanical retention and thermal transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Input current entry point | Connected to positive rail or switch node; carries full load current into device. |
| Pin 2 (Cathode) | Output current exit point | Delivers rectified current to output capacitor/load; electrically tied to metal tab in TO-220AC variant. |
| Metal Tab (Case) | Anode connection / thermal path | Internally bonded to Pin 1; provides primary heat conduction path to heatsink; must be electrically isolated if cathode-referenced layout used. |
Key Features
| Feature | Design Value |
|---|---|
| Schottky barrier construction | Enables near-zero reverse recovery time (trr < 10 ns), eliminating switching losses in >100 kHz topologies. |
| Guard ring protection | Prevents premature edge breakdown under fast-rising transients (e.g., MOSFET turn-off spikes), improving system reliability. |
| Low VF at rated current | 0.55 V conduction drop at 8A ensures < 4.4W power loss - critical for thermally constrained 1U power supplies. |
| TO-220AC mechanical standardization | Compatible with legacy heatsink footprints and automated through-hole assembly tooling across industrial OEMs. |
Applications
| DC-DC Converter Output Rectification | Freewheeling Diode in Buck Regulators |
|---|---|
Use Scenario: Used as secondary-side rectifier in isolated 12V-to-5V flyback converters powering FPGA I/O banks. IC Role / Device Role / Timing Role: Unidirectional current steering element converting transformer AC output to regulated DC; no timing function. Use Value: 0.55V forward drop minimizes conduction loss at 6A typical load, improving efficiency by 1.8% over comparable 40V Schottky devices. | Use Scenario: Placed across low-side MOSFET in 24V-input synchronous buck stage driving servo motor control logic. IC Role / Device Role / Timing Role: Freewheeling path for inductor current during high-side switch off-time; critical for continuous current delivery. Use Value: 200A surge rating absorbs inductive kickback energy without degradation, supporting 50A peak motor startup currents. |
| Polarity Protection in Industrial PLC Modules | Reverse Voltage Clamp in Telecom Power Feeds |
Use Scenario: Series-connected at 24V DC input of programmable logic controller backplane to prevent damage from miswired field wiring. IC Role / Device Role / Timing Role: Forward-biased series blocking diode; conducts only during correct polarity connection. Use Value: 8A continuous rating accommodates 5A module base load plus 3A headroom for future expansion slots. | Use Scenario: Installed across -48V telecom power feed inputs to clamp accidental +48V insertion events. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp; conducts only during fault condition to limit bus voltage excursion. Use Value: 45V VRRM provides 3V margin above nominal -48V absolute value, enabling reliable clamping without leakage-induced standby drain. |
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 VRRM, 8A IF(AV), VF = 0.54V @ 8A - slightly lower blocking voltage, identical thermal resistance. | Not suitable for 36V input systems requiring 45V margin; acceptable in 24V-only designs. | Select when cost sensitivity outweighs need for 45V rating and board space allows alternate footprint. |
| ON Semiconductor MBR845CT | 45V VRRM, dual common-cathode die in TO-220AB package - higher VF (0.70V), 2-pin cathode tie-out configuration. | Requires PCB redesign for dual-diode layout; unsuitable for single-diode freewheeling use cases. | Choose only when dual-diode topology is required and higher conduction loss is acceptable. |
Compared with VS-8EWH04FN-M3 and MBR845CT, the SBL845 uniquely balances 45V blocking headroom, sub-0.56V forward drop, and single-diode TO-220AC simplicity - making it optimal for cost-sensitive, thermally constrained 24–36V industrial power rails where layout reuse matters.
Availability
SBL845 is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectification modules, and embedded motor drive subsystems requiring stable component supply and long-term manufacturability assurance.
Supply support for SBL845 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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The SBL8xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, high-frequency power conversion in compact industrial and telecom power supplies.
FAQ
Is the SBL845 RoHS compliant?
Yes, the SBL845 features a lead-free finish and meets RoHS Directive 2011/65/EU requirements, including exemptions for glass and high-temperature solder per Annexes 5 and 7. Certificate of Compliance is available upon request from Diodes Incorporated's quality portal.
What is the maximum operating temperature for the SBL845 junction?
The SBL845 has a specified junction temperature range of –65°C to +150°C. Its derating curve shows zero average forward current capability at 150°C case temperature, with full 8A rating maintained only up to 95°C case temperature under heatsink-mounted conditions.
Can the metal tab of the SBL845 be electrically isolated from the anode?
No - in the TO-220AC package variant, the metal tab is internally bonded to Pin 1 (anode) and cannot be electrically isolated. For cathode-referenced heatsink mounting, external insulation (e.g., mica washer + shoulder washer) is mandatory to prevent short-circuiting.
Why is the SBL845 marked 'NOT RECOMMENDED FOR NEW DESIGN'?
This designation reflects Diodes Incorporated's internal roadmap guidance: newer alternatives like the SBRA845 (with improved VF and RθJC) have superseded the SBL845. However, the SBL845 remains fully qualified, in active production, and supported for existing designs with documented lifecycle commitments.
SBL845 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):
- 45 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 @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AC
- Operating Temperature - Junction:
- -65°C ~ 150°C
SBL845 FAQ
1.How can I place an order for SBL845 through Aetrix?
Please submit a Request for Quotation (RFQ) for SBL845 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 SBL845 reliable?
The price and inventory of SBL845 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL845 is usually 5 days.
3.What payment methods are accepted for SBL845?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL845 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBL845?
SBL845 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBL845 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 SBL845?
For technical support, including SBL845 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL845 requirements.
6.How does Aetrix verify that SBL845 is sourced from the original manufacturer or authorized distributors?
All SBL845 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 SBL845 meets industry standards.
7.What is the process for return or replacement of SBL845?
All SBL845 units undergo pre-shipment inspection (PSI). If there is an issue with SBL845, 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 SBL845 part is unused and in its original packaging.
Return procedure for SBL845:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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