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Diodes Incorporated SBL545
- Part No.:
- SBL545
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-220-2
- Datasheet:
-
SBL545.pdf
- Description:
- DIODE SCHOTTKY 45V 5A TO220AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,709
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Product details
Overview
SBL545 from Diodes Incorporated is a 5.0A, 45V Schottky barrier rectifier in TO-220AC package, featuring 0.70V forward voltage drop at 5.0A/25°C, 175A non-repetitive surge capability, and 3°C/W thermal resistance junction-to-case-designed for low-voltage, high-frequency inverters and polarity protection circuits.
For engineers reviewing the SBL545 datasheet, SBL545 pinout, SBL545 application, or SBL545 equivalent, key selection criteria include its 45V blocking rating, low VF performance under 5A DC load, TO-220AC thermal interface compatibility, and guard ring die construction for transient robustness in industrial power conversion.
Technical Context
This single-diode Schottky rectifier uses a guard ring die structure to enhance transient voltage immunity and reduce leakage drift under thermal stress. Its low forward voltage (0.70V @ 5A, 25°C) and high surge rating (175A, 8.3ms half-sine) support efficient energy transfer in switching power supplies and freewheeling paths.
The device operates across –65°C to +150°C with 500pF junction capacitance at 4V reverse bias and 1.0MHz, enabling stable performance in high-frequency rectification up to several hundred kHz without excessive capacitive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 48V bus or 36V SMPS designs. |
| IO | 5.0 A @ TC = 95°C - Continuous DC output current when case temperature is maintained at 95°C using heatsink mounting. |
| VFM | 0.70 V @ IF = 5.0A, TC = 25°C - Low conduction loss enables >92% efficiency in 5–12V output rectification stages. |
| IFSM | 175 A, 8.3ms half-sine - Withstands inrush and short-circuit surges typical in motor drives and UPS systems. |
| RθJC | 3 °C/W - Enables direct thermal coupling to heatsinks; allows ~30W dissipation before exceeding 150°C junction limit at 95°C case. |
| Cj | 500 pF @ VR = 4V, 1MHz - Limits high-frequency displacement current; suitable for <500kHz switching topologies. |
Pinout & Package
Package: TO-220AC - Molded plastic case with UL 94V-0 flammability rating, tin-plated terminals solderable per MIL-STD-202 Method 208, and integral metal tab for heatsink mounting (Pin 1 = Anode, Pin 2 = Cathode, Case = Anode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Main current entry point; electrically connected to metal tab for low-inductance, high-current anode routing and thermal path. |
| Pin 2 | Cathode | Current exit terminal; isolated from tab; requires PCB trace or wire connection to output/load return. |
| Metal Tab (Case) | Anode | Internally bonded to Pin 1; must be electrically insulated from heatsink unless system design permits common-anode configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves transient voltage immunity and reduces IR drift at elevated temperatures by suppressing edge breakdown. |
| Low forward voltage drop | 0.70V @ 5A enables <1.8W conduction loss at full rated current, reducing thermal load in compact enclosures. |
| High surge current rating | 175A peak supports reliable operation during motor startup, capacitor charging, and fault transients without degradation. |
| TO-220AC thermal interface | 3°C/W RθJC allows direct mounting to heatsinks for sustained 5A operation without forced air cooling. |
Applications
| DC-DC Converter Output Rectification | Automotive Alternator Freewheeling |
|---|---|
Use Scenario: Used as secondary-side synchronous rectifier replacement in 5–12V isolated flyback or forward converters. IC Role / Device Role / Timing Role: Uncontrolled power diode conducting during transformer reset phase; handles continuous 5A DC output current. Use Value: 0.70V VF reduces conduction loss by ~35% vs. standard silicon rectifiers, improving efficiency and easing thermal management. | Use Scenario: Installed across alternator field winding to suppress inductive kickback during regulator switching. IC Role / Device Role / Timing Role: Freewheeling diode clamping back-EMF spikes to protect voltage regulator ICs and MOSFET switches. Use Value: 175A IFSM withstands repeated 100–150A alternator turn-off surges without degradation over 15+ year service life. |
| Polarity Protection in Industrial Power Inputs | Low-Voltage Inverter DC Bus Clamp |
Use Scenario: Placed in series with 24V/48V DC input lines to prevent damage from reverse battery connection. IC Role / Device Role / Timing Role: Series-blocking diode ensuring unidirectional current flow; conducts only during correct polarity insertion. Use Value: 45V VRRM provides 20% margin above 36V nominal systems; low VF limits voltage drop to <0.7V at full load. | Use Scenario: Connected between DC bus and ground in H-bridge inverters to clamp negative voltage excursions during dead-time transitions. IC Role / Device Role / Timing Role: Clamping diode limiting bus undershoot to ~0.7V below ground, protecting gate drivers and bootstrap capacitors. Use Value: 500pF Cj minimizes capacitive loading on fast-switching nodes; guard ring ensures stable clamping under repetitive dV/dt stress. |
Availability
SBL545 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive alternator freewheeling, and polarity protection requiring stable component supply despite end-of-life status.
Supply support for SBL545 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 SBL5xx series belongs to Diodes' high-current Schottky rectifier product line, engineered specifically for efficiency-critical, thermally constrained power conversion in industrial, computing, and automotive applications.
FAQ
Is SBL545 still in active production?
No. Diodes Incorporated officially discontinued SBL545 and marked it "OBSOLETE – PART DISCONTINUED" in August 2015. It is no longer manufactured, and Diodes states there is no alternate part. Aetrix Electronics maintains limited legacy stock with full traceability for ongoing maintenance and repair programs.
What is the thermal mounting requirement for SBL545?
SBL545 requires mechanical attachment of its metal tab (anode) to a heatsink via screw or clip, with thermal interface material. The 3°C/W RθJC rating assumes full tab contact; isolation washers must be rated for ≥150°C and tested for dielectric integrity at 45V working voltage.
Can SBL545 replace SBL540 or SBL550 in existing designs?
Yes, with electrical verification. SBL545 shares identical TO-220AC package, pinout, and thermal characteristics with SBL540 (40V) and SBL550 (50V), differing only in VRRM. Substitution requires confirming that 45V blocking meets system transient margin requirements and that 0.70V VF aligns with thermal budget.
Does SBL545 meet RoHS requirements?
Yes. SBL545 features lead-free finish and complies with RoHS Directive 2002/95/EC (as revised 13.2.2003), including exemptions for glass and high-melting-point solder per EU Annex Notes 5 and 7. Certificate of Compliance is available upon request.
SBL545 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):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 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
SBL545 FAQ
1.How can I place an order for SBL545 through Aetrix?
Please submit a Request for Quotation (RFQ) for SBL545 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 SBL545 reliable?
The price and inventory of SBL545 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBL545 is usually 5 days.
3.What payment methods are accepted for SBL545?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBL545 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBL545?
SBL545 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBL545 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 SBL545?
For technical support, including SBL545 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBL545 requirements.
6.How does Aetrix verify that SBL545 is sourced from the original manufacturer or authorized distributors?
All SBL545 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 SBL545 meets industry standards.
7.What is the process for return or replacement of SBL545?
All SBL545 units undergo pre-shipment inspection (PSI). If there is an issue with SBL545, 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 SBL545 part is unused and in its original packaging.
Return procedure for SBL545:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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