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Diodes Incorporated B320AF-13
- Part No.:
- B320AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B320AF-13.pdf
- Description:
- DIODE SCHOTTKY 20V 3A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:10,480
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Product details
Overview
B320AF-13 from Diodes Incorporated is a 20 V, 3 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.50 V max forward voltage at 3 A and 0.20 mA max reverse leakage at 20 V/25°C, optimized for boost, blocking, and recirculating diode functions in DC-DC converters and power supplies.
For engineers reviewing the B320AF-13 datasheet, B320AF-13 pinout, B320AF-13 application, or B320AF-13 equivalent, key selection criteria include low VF for efficiency, high-temperature IR stability, SMAF thermal resistance (RθJA = 85°C/W), and RoHS/Green compliance for industrial and automotive power designs.
Technical Context
This Schottky rectifier uses a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve low forward voltage drop and minimal stored charge. Its 140 pF typical junction capacitance at 4 V supports high-frequency switching up to several hundred kHz without excessive capacitive loss.
The device operates across –55°C to +150°C with thermal resistance of 45°C/W junction-to-case, enabling reliable performance in thermally constrained layouts. Reverse leakage remains below 0.20 mA at rated VR and 25°C, and stays under 12 mA at 125°C - critical for thermal runaway mitigation in high-ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in boost converter output stage |
| IO (AV) | 3 A - Average forward current rating at 25°C ambient; derates to ~1.5 A at 100°C per Figure 4 |
| VF (max) | 0.50 V @ 3 A, 25°C - Directly reduces conduction loss and improves system efficiency by ~0.75 W vs. silicon diode |
| IR (max) | 0.20 mA @ 20 V, 25°C - Low leakage preserves standby power and enables stable operation in high-temp recirculation paths |
| RθJA | 85 °C/W - Thermal resistance on FR-4 board; determines required copper area for 3 A continuous operation |
| Junction Capacitance | 140 pF @ 4 V, 1 MHz - Limits high-frequency switching noise and EMI in SMPS snubber-free topologies |
Pinout & Package
Package: SMAF (Surface Mount Axial Flat) - molded plastic case, 0.036 g weight, UL 94V-0 rated, cathode band marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in boost); requires low-inductance trace routing |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output rail; must handle full IO and IFSM (80 A surge) |
Key Features
| Feature | Design Value |
|---|---|
| Low VF (0.50 V max @ 3 A) | Reduces conduction loss by >40% vs. standard silicon rectifiers, lowering thermal stress in compact power stages |
| High-temp IR stability (≤12 mA @ 125°C) | Prevents thermal runaway in enclosed enclosures or under sustained load, improving long-term reliability |
| SMAF package with RθJC = 45°C/W | Enables direct heat transfer to PCB copper pour, supporting 3 A continuous without heatsink in space-constrained designs |
| RoHS & Halogen/Antimony-Free "Green" | Meets IPC-1752A material declaration requirements and EU environmental directives for industrial and automotive end equipment |
Applications
| Boost Diode in DC-DC Converters | Blocking Diode in Solar Charge Controllers |
|---|---|
Use Scenario: Used in non-synchronous boost converter output stage to isolate input from output during switch-off phase. IC Role / Device Role: Unidirectional current path with minimal forward loss and fast recovery (<10 ns). Use Value: 0.50 V VF directly increases conversion efficiency by ~2–3% at 3 A, reducing thermal design burden. | Use Scenario: Prevents battery discharge back through PV panel at night in off-grid solar systems. IC Role / Device Role: Reverse-blocking element with low leakage to minimize standby power loss. Use Value: 0.20 mA IR at 25°C ensures <1 mW standby loss per diode, extending battery autonomy. |
| Recirculating Diode in Relay Drivers | Output Rectifier in AC-DC Adapters |
Use Scenario: Freewheeling path for inductive load current when relay coil is de-energized. IC Role / Device Role: Clamp voltage spike and dissipate stored energy safely. Use Value: 80 A IFSM rating handles typical relay coil surge without degradation over 100k+ cycles. | Use Scenario: Secondary-side rectification in 5–24 V output flyback or forward converters. IC Role / Device Role: High-efficiency output rectifier replacing slower, higher-VF alternatives. Use Value: 140 pF CT minimizes high-frequency ringing, easing EMI filter design in Class II adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS32 (Micro Commercial) | Same 20 V VRRM, 3 A IO, but VF = 0.55 V max; RθJA = 90°C/W; no Green/Halogen-free certification | Acceptable where efficiency margin >0.05 V is available and environmental compliance is not mandated | Select only if cost sensitivity outweighs thermal and regulatory requirements |
| SB320-E3/52 (Vishay) | Identical VRRM/IO/VF specs; SMA package (not SMAF); RθJA = 95°C/W; RoHS-compliant but not Halogen-free | Requires pad layout revision due to larger SMA footprint; slightly higher thermal impedance limits high-density placement | Choose when legacy SMA footprint compatibility is prioritized over thermal optimization |
Compared with SS32 and SB320-E3/52, B320AF-13 delivers superior thermal performance (85°C/W vs. ≥90°C/W), guaranteed halogen/antimony-free compliance, and tighter VF control - making it preferred for thermally aggressive, regulated, or miniaturized power designs.
Availability
B320AF-13 is available at Aetrix Electronics and suitable for DC-DC boost converters, solar charge controllers, relay driver circuits, and AC-DC adapter rectification requiring stable component supply and consistent parametric performance across temperature.
Supply support for B320AF-13 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 B320AF-13 belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical, thermally demanding power conversion in industrial, computing, and renewable energy systems.
FAQ
What is the maximum junction temperature for continuous operation of B320AF-13?
The B320AF-13 has an absolute maximum junction temperature of +150°C, with continuous operation supported across –55°C to +150°C ambient when derated per Figure 4. At 100°C ambient, its usable IO drops to approximately 1.5 A on standard FR-4 PCBs.
Does B320AF-13 require a heatsink for 3 A DC operation?
No external heatsink is required for 3 A DC operation at ≤50°C ambient on a standard FR-4 board with recommended 0.2" × 0.25" copper pad. At 75°C ambient, thermal design must include additional copper area or airflow to maintain TJ < 150°C.
Is B320AF-13 compatible with lead-free reflow soldering profiles?
Yes - B320AF-13 features matte tin annealed terminals and meets JEDEC J-STD-020 moisture sensitivity Level 1, supporting standard lead-free reflow profiles up to 260°C peak with ≤60 sec above 217°C.
How does the SMAF package differ from standard SMA in thermal performance?
The SMAF package has a flatter profile and thinner mold compound than standard SMA, resulting in lower RθJA (85°C/W vs. ~95°C/W) and improved thermal coupling to PCB copper. Its smaller footprint also allows denser layout in space-constrained power modules.
B320AF-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 20 V
- Capacitance @ Vr, F:
- 140pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B320AF-13 FAQ
1.How can I place an order for B320AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B320AF-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 B320AF-13 reliable?
The price and inventory of B320AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B320AF-13 is usually 5 days.
3.What payment methods are accepted for B320AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B320AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B320AF-13?
B320AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B320AF-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 B320AF-13?
For technical support, including B320AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B320AF-13 requirements.
6.How does Aetrix verify that B320AF-13 is sourced from the original manufacturer or authorized distributors?
All B320AF-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 B320AF-13 meets industry standards.
7.What is the process for return or replacement of B320AF-13?
All B320AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B320AF-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 B320AF-13 part is unused and in its original packaging.
Return procedure for B320AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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