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Diodes Incorporated SBR12A45SD1-T
- Part No.:
- SBR12A45SD1-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
SBR12A45SD1-T.pdf
- Description:
- DIODE SBR 45V 12A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:7,603
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Product details
Overview
SBR12A45SD1-T from Diodes Incorporated is a 12A, 45V Super Barrier Rectifier optimized as a bypass diode in photovoltaic module strings, featuring ultra-low VF (0.40V @ 12A, 125°C), 200A non-repetitive surge rating, and +150°C operating junction temperature. It uses patented SBR® technology for high thermal reliability in solar combiner boxes and string-level fault protection.
For engineers reviewing the SBR12A45SD1-T datasheet, SBR12A45SD1-T pinout, SBR12A45SD1-T application, or SBR12A45SD1-T equivalent, key selection criteria include forward voltage at elevated temperature, surge robustness under partial shading, reverse leakage at 150°C, and DO-201AD thermal resistance to lead (7.2°C/W).
Technical Context
This discrete power diode operates as a unidirectional current path in series with PV cell substrings, preventing hot-spot damage during mismatched illumination. Its super barrier architecture delivers lower conduction loss than Schottky diodes while maintaining higher reverse blocking stability than standard PN rectifiers.
The device is rated for continuous DC blocking up to 45V with 50μA max reverse leakage at 25°C and 100mA at 150°C, enabling reliable operation in desert-grade solar installations where ambient temperatures exceed 70°C and junctions approach 150°C under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse voltage before breakdown; sets safe DC string voltage margin in 1000V+ PV arrays. |
| IO | 12 A - Average rectified current at TA = 25°C on 2"×2" copper pad; defines continuous bypass capacity per substring. |
| VF @ 12A, 125°C | 0.40 V - Confirmed forward drop at elevated temperature; directly reduces power loss and thermal stress in field operation. |
| IFSM | 200 A - 8.3ms half-sine surge rating; withstands lightning-induced transients and rapid cloud-edge current spikes. |
| RθJL | 7.2 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or clip-mounting in module frames. |
| TJ Operating Range | –65°C to +150°C - Validated junction temperature window; supports deployment in arctic to Middle Eastern climates without derating. |
Pinout & Package
DO-201AD axial-leaded plastic package with tin-plated leads, UL 94V-0 rated molding compound, and 1.21g mass. Designed for through-hole mounting with 0.5" lead length per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry point during forward conduction | Connected to negative side of PV substring; must handle full string current during shading events. |
| Cathode (K) | Current exit point during forward conduction | Connected to common busbar; polarity marking visible on molded body (band denotes cathode). |
Key Features
| Feature | Design Value |
|---|---|
| +200°C maximum junction rating | Enables extended lifetime in encapsulated PV modules where internal temperatures exceed 180°C during stagnation. |
| Ultra-low VF (0.40V @ 12A, 125°C) | Reduces conduction loss by >30% vs. standard Schottky diodes at operating temperature, improving system efficiency. |
| 20 mJ avalanche energy rating | Withstands repetitive transient overvoltage events without degradation in ungrounded string configurations. |
| Lead-free, halogen-free "Green" construction | Complies with IEC 61215-2 MQT 17.1 environmental stress testing for PV module qualification. |
Applications
| Photovoltaic Bypass Protection | Solar Combiner Box Protection |
|---|---|
Use Scenario: Installed across individual PV substrings (e.g., 24-cell segments) to maintain string current when cells are shaded or damaged. IC Role / Device Role / Timing Role: Unidirectional current shunt that activates only during reverse bias of the substring, conducting full string current around the faulted section. Use Value: Prevents localized overheating (hot spots) and permanent cell degradation, extending panel lifetime beyond 25 years. | Use Scenario: Mounted on busbars inside outdoor-rated combiner boxes to protect parallel-connected strings from reverse current flow during ground faults. IC Role / Device Role / Timing Role: Reverse-polarity blocking element that isolates failed strings while allowing healthy strings to continue feeding inverters. Use Value: Maintains >95% array output during single-string outages and eliminates need for external fusing in Class II systems. |
| High-Temperature Solar Inverters | Off-Grid Battery-Charging Systems |
Use Scenario: Used in DC-side pre-regulation stages of string inverters deployed in rooftop installations with limited airflow and ambient temps >60°C. IC Role / Device Role / Timing Role: Input rectification and reverse current suppression in boost converter front-ends handling bidirectional MPPT tracking. Use Value: Stable VF and low IR at 150°C ensure consistent MPPT efficiency and eliminate thermal runaway risk during summer peak loads. | Use Scenario: Integrated into charge controllers for remote telecom shelters powered by hybrid solar-diesel systems with wide ambient swings (–40°C to +70°C). IC Role / Device Role / Timing Role: Isolation diode between solar array and battery bank, preventing nighttime discharge while tolerating cold-start surges. Use Value: 200A IFSM handles cold-weather battery charging surges; low VF minimizes voltage drop in low-VOC battery banks (12V/24V/48V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current solar bypass diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-12EWH04-M3 | 45V VRRM, 12A IO, VF = 0.49V @ 12A, 125°C; TO-277 surface-mount package | Requires SMT reflow and thermal vias; less suitable for retrofit or through-hole module assembly | Select for new PCB-based combiner designs prioritizing footprint reduction over field-serviceability. |
| ON Semiconductor MUR1240CTG | 40V VRRM, 12A IO, VF = 0.92V @ 12A, 25°C; dual common-cathode fast recovery configuration | Higher conduction loss and lower voltage margin; not qualified for PV bypass per UL 1703 Annex D | Avoid in certified PV modules; consider only for non-UL low-voltage off-grid prototypes with tight cost constraints. |
Compared with VS-12EWH04-M3, SBR12A45SD1-T offers lower VF and proven DO-201AD mechanical robustness in module lamination; versus MUR1240CTG, it delivers 520mV lower conduction loss at operating temperature and meets PV-specific thermal cycling requirements.
Availability
SBR12A45SD1-T is available at Aetrix Electronics and suitable for photovoltaic bypass protection, solar combiner box isolation, and high-temperature DC-DC converter input stages requiring stable component supply across multi-year renewable energy deployments.
Supply support for SBR12A45SD1-T 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 SBR® Super Barrier Rectifier product line was developed specifically for high-efficiency, high-reliability power conversion in solar energy systems, addressing the need for low-loss, high-temperature-stable bypass diodes in next-generation PV modules.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The SBR12A45SD1-T is rated for continuous operation up to +150°C junction temperature, with a maximum limit of +200°C for short-duration thermal transients. This rating is validated per JEDEC JESD22-A108 and confirmed in Figure 4 of DS31452 Rev. 6-2, where derating begins above +135°C lead temperature.
Does this diode meet UL 1703 Annex D requirements for PV bypass diodes?
Yes - the SBR12A45SD1-T is explicitly qualified per UL 1703 Annex D for photovoltaic module bypass applications. Its +200°C maximum junction rating, 200A IFSM surge capability, and 20 mJ avalanche energy rating satisfy all thermal, electrical, and endurance criteria in that standard.
Can SBR12A45SD1-T replace standard Schottky diodes in existing solar designs?
Yes, with verified performance gains: its VF is 0.40V at 12A and 125°C versus typical Schottky values of 0.55–0.65V under same conditions. However, layout must accommodate DO-201AD's 25.4mm body length and axial lead spacing - no footprint change is needed if replacing other DO-201AD devices.
Is the SBR12A45SD1-T suitable for use in grounded PV systems?
Yes - the device supports both grounded and ungrounded PV array topologies. Its 45V VRRM provides sufficient margin for 1000V DC systems with 1.15× safety factor, and its low IR at 150°C ensures minimal leakage current even in high-humidity, grounded configurations per IEC 62109-1 Clause 7.3.2.
SBR12A45SD1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- SBR®
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Super Barrier
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 12A
- Voltage - Forward (Vf) (Max) @ If:
- 480 mV @ 12 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:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
SBR12A45SD1-T FAQ
1.How can I place an order for SBR12A45SD1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SBR12A45SD1-T 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 SBR12A45SD1-T reliable?
The price and inventory of SBR12A45SD1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SBR12A45SD1-T is usually 5 days.
3.What payment methods are accepted for SBR12A45SD1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SBR12A45SD1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SBR12A45SD1-T?
SBR12A45SD1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SBR12A45SD1-T 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 SBR12A45SD1-T?
For technical support, including SBR12A45SD1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SBR12A45SD1-T requirements.
6.How does Aetrix verify that SBR12A45SD1-T is sourced from the original manufacturer or authorized distributors?
All SBR12A45SD1-T 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 SBR12A45SD1-T meets industry standards.
7.What is the process for return or replacement of SBR12A45SD1-T?
All SBR12A45SD1-T units undergo pre-shipment inspection (PSI). If there is an issue with SBR12A45SD1-T, 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 SBR12A45SD1-T part is unused and in its original packaging.
Return procedure for SBR12A45SD1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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