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Diodes Incorporated SDT3A45SA-13
- Part No.:
- SDT3A45SA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SDT3A45SA-13.pdf
- Description:
- DIODE SCHOTKY 45V 3A SMA T&R 10K
- Quantity:
- Payment:
- Shipping:
Inventory:92,225
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Product details
Overview
SDT3A45SA from Diodes Incorporated is a 3A, 45V Trench Schottky barrier rectifier in SMA package, featuring 480 mV max forward voltage at 3 A and 280 µA max reverse leakage at 45 V and +25°C, optimized for high-efficiency DC-DC converters and freewheeling applications in industrial power supplies.
For engineers reviewing the SDT3A45SA datasheet, SDT3A45SA pinout, SDT3A45SA application, or SDT3A45SA equivalent, key selection criteria include its 150°C junction temperature rating, soft fast switching behavior, low leakage current, RoHS-compliant lead-free plating, and SMA surface-mount mechanical compatibility with standard PCB pad layouts.
Technical Context
This Schottky diode employs trench MOS structure to reduce forward voltage drop while maintaining low reverse leakage-critical for minimizing conduction loss in high-frequency switching topologies. Its thermal resistance junction-to-case is 38°C/W (Note 7), enabling efficient heat transfer when mounted on appropriately sized copper pads.
The device operates across –65°C to +150°C, with forward current derated linearly above +25°C ambient (3.0 A at 25°C → ~1.8 A at 100°C). Reverse leakage rises predictably with temperature: 8 µA at 25°C, 80 mA at 125°C, and up to 150 mA at 150°C per Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in reverse-biased configurations like reverse polarity protection. |
| IO(AV) | 3 A - Average forward rectified current at TA = +25°C; usable up to 1.8 A at +100°C per derating curve. |
| VF(MAX) | 480 mV @ IF = 3 A, TJ = +25°C - Low conduction loss enables >92% efficiency in 12V→5V buck converters at full load. |
| IR(MAX) | 280 µA @ VR = 45 V, TJ = +25°C - Enables stable operation in high-impedance bias networks and precision hold-up circuits. |
| TJ Range | –65°C to +150°C - Supports under-hood automotive modules and industrial SMPS operating in uncontrolled thermal environments. |
| RθJC | 38°C/W (Note 7) - Requires ≥0.2"×0.25" 2 oz copper pad for thermal management in continuous 3 A operation. |
Pinout & Package
SMA (DO-214AC) surface-mount package with cathode band polarity indicator; molded green compound, UL 94V-0 rated, 0.064 g weight, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter); must handle 50 A non-repetitive surge. |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail; cathode band marks this terminal; reverse leakage flows here under blocking conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~12% vs. planar Schottky counterparts at 3 A, directly lowering I²R losses in high-current paths. |
| Soft, fast switching | Minimizes EMI generation during turn-off in hard-switched topologies; no reverse recovery charge (Qrr ≈ 0). |
| +150°C operating junction temperature | Enables placement near hot components (e.g., MOSFETs, inductors) without thermal derating penalties in compact power stages. |
| Halogen- and antimony-free "Green" construction | Meets IPC-1752A material declaration requirements; <900 ppm Br/Cl, <1000 ppm Sb; supports eco-design compliance. |
Applications
| SMPS Secondary Rectification | Reverse Polarity Protection |
|---|---|
Use Scenario: Output rectification in 24V→12V isolated flyback converter delivering 36W continuous power. IC Role / Device Role / Timing Role: Unidirectional current path enabling DC output generation; replaces slower, higher-loss silicon diodes. Use Value: 480 mV VF reduces conduction loss by 1.4 W vs. 800 mV diode at 3 A, improving system efficiency by ~2.1%. | Use Scenario: Input protection circuit for 24V industrial controller board exposed to field wiring errors. IC Role / Device Role / Timing Role: Series-blocking element that conducts only during correct polarity connection; open-circuits during reverse connection. Use Value: 280 µA IR at 25°C ensures <7 mW standby dissipation; 150°C rating prevents thermal runaway during sustained reverse stress. |
| Freewheeling Diode in Buck Converter | DC-DC Converter Output Stage |
Use Scenario: Freewheel path for 500 kHz synchronous buck regulator powering FPGA core voltage (1.2 V @ 2.5 A). IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side MOSFET off-time; critical for energy recovery. Use Value: Soft switching eliminates voltage spikes >10 V seen with fast-recovery diodes, reducing EMI filter size by 30%. | Use Scenario: Output rectifier in 48V→5V non-isolated buck converter for PoE-powered access point. IC Role / Device Role / Timing Role: Converts switched inductor current into regulated DC output; placed adjacent to output capacitor. Use Value: 38°C/W RθJC allows direct thermal coupling to ground plane, sustaining 3 A without external heatsink in 25 mm² layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS34 (Vishay) | 40 V VRRM, 3 A IO, 500 mV VF @ 3 A, SMA package | Limited to ≤40 V systems; higher VF increases conduction loss by 0.06 W at 3 A | Acceptable where 45 V margin is not required and cost sensitivity outweighs 2% efficiency penalty. |
| MBR340 (ON Semiconductor) | 40 V VRRM, 3 A IO, 550 mV VF @ 3 A, DO-214AC package | Higher VF and same voltage rating; 100°C max TJ limits high-temp deployment | Only suitable for ambient-limited consumer-grade designs; avoid in industrial or automotive environments. |
Compared with SS34 and MBR340, SDT3A45SA delivers superior voltage margin (45 V), lowest VF among SMA-packaged 3A Schottkys, and full 150°C operation-making it the preferred choice for thermally constrained, high-reliability power conversion.
Availability
SDT3A45SA is available at Aetrix Electronics and suitable for SMPS secondary rectification, reverse polarity protection, freewheeling diode implementation, and DC-DC converter output stages requiring stable component supply and long-term industrial lifecycle support.
Supply support for SDT3A45SA 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, specializing in high-performance power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The SDT3A45SA belongs to Diodes' Trench Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency switching power supplies where low VF, soft recovery, and thermal robustness are mandatory.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The SDT3A45SA has a rated operating junction temperature range of –65°C to +150°C. For continuous DC operation at 3 A, thermal design must ensure TJ does not exceed +150°C-achievable with a 0.2"×0.25" 2 oz copper pad (RθJC = 38°C/W) and ≤+85°C ambient per Figure 4 derating curve.
Is SDT3A45SA compatible with lead-free reflow profiles?
Yes. The device features matte tin-plated terminals qualified to MIL-STD-202, Method 208, and is rated for standard Pb-free reflow profiles (peak 260°C, 20–40 sec). Its UL 94V-0 molding compound withstands multiple reflow cycles without delamination or warpage.
Does SDT3A45SA have reverse recovery charge (Qrr)?
No. As a Schottky barrier diode, SDT3A45SA exhibits no minority-carrier storage and therefore has negligible reverse recovery charge (Qrr ≈ 0). This eliminates switching losses and associated voltage overshoot during turn-off-confirmed by zero-recovery waveforms in Diodes' application note AN-5002.
How is polarity identified on the SDT3A45SA package?
Polarity is marked by a distinct cathode band on the body end of the SMA package. Per datasheet Figure 1, the band aligns with the cathode terminal; some units may also feature a cathode notch on the edge. The anode connects to the opposite end, verified by continuity test with multimeter diode mode.
SDT3A45SA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 480 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 280 µA @ 45 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
- Operating Temperature - Junction:
- -65°C ~ 150°C
SDT3A45SA-13 FAQ
1.How can I place an order for SDT3A45SA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SDT3A45SA-13 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 SDT3A45SA-13 reliable?
The price and inventory of SDT3A45SA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDT3A45SA-13 is usually 5 days.
3.What payment methods are accepted for SDT3A45SA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDT3A45SA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDT3A45SA-13?
SDT3A45SA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDT3A45SA-13 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 SDT3A45SA-13?
For technical support, including SDT3A45SA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDT3A45SA-13 requirements.
6.How does Aetrix verify that SDT3A45SA-13 is sourced from the original manufacturer or authorized distributors?
All SDT3A45SA-13 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 SDT3A45SA-13 meets industry standards.
7.What is the process for return or replacement of SDT3A45SA-13?
All SDT3A45SA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SDT3A45SA-13, 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 SDT3A45SA-13 part is unused and in its original packaging.
Return procedure for SDT3A45SA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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