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Diodes Incorporated B250AF-13
- Part No.:
- B250AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B250AF-13.pdf
- Description:
- DIODE SCHOTTKY 50V 2A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:8,791
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Product details
Overview
B250AF-13 from Diodes Incorporated is a 50 V, 2 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.65 V max forward voltage at 2 A and 0.10 mA max reverse leakage at 50 V and +25°C, optimized for boost, blocking, and recirculating diode functions in DC-DC converters and power supplies.
For engineers reviewing the B250AF-13 datasheet, B250AF-13 pinout, B250AF-13 application, or B250AF-13 equivalent, this device is selected for low-loss rectification where thermal stability at elevated junction temperatures (up to +150°C) and tight VF consistency across temperature are critical design requirements.
Technical Context
This Schottky rectifier uses a planar metal-silicon junction structure to achieve low forward voltage drop and fast switching with no minority-carrier storage delay. Its 80 pF typical junction capacitance at 4 V supports high-frequency operation up to several hundred kHz in switch-mode topologies.
Thermal resistance is specified at 95 °C/W (junction-to-ambient, FR-4 board) and 45 °C/W (junction-to-case), enabling reliable 2 A continuous conduction under moderate PCB copper area and ambient conditions up to +75°C without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 24–48 V input rails. |
| IO | 2 A - Continuous average forward current rating at +25°C ambient; derates linearly above +25°C per Figure 4. |
| VF (max) | 0.65 V @ 2 A, +25°C - Directly reduces conduction loss to ≤1.3 W per diode; improves system efficiency vs. standard PN rectifiers. |
| IR (max) | 0.10 mA @ 50 V, +25°C - Low leakage preserves efficiency in standby and light-load conditions; stable up to +125°C. |
| RθJA | 95 °C/W - Predicts ~190°C junction rise at 2 A on minimal FR-4 pad; requires thermal relief or copper pour for sustained full-load operation. |
| TJ Range | −55 to +150°C - Enables deployment in automotive under-hood, industrial motor drives, and outdoor power equipment. |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat), molded plastic case with matte tin–annealed copper leadframe, cathode band marking, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in boost); accepts up to 50 A non-repetitive surge. |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; connects to output rail; sustains 50 V reverse bias with <0.1 mA leakage at +25°C. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high temperature | 0.52 V @ 2 A, +125°C - Maintains <1.05 W conduction loss even at elevated junction temps, reducing thermal runaway risk. |
| Stable high-temp IR | ≤0.015 mA @ 50 V, +125°C - Limits standby power loss and prevents thermal drift in sealed enclosures. |
| Green packaging | Halogen- and antimony-free, RoHS-compliant molding compound (<900 ppm Br/Cl, <1000 ppm Sb) - Meets IEC 61249-2-21 and JEDEC J-STD-020. |
| SMAF footprint compatibility | 0.90–1.10 mm A dimension, 3.95–4.60 mm E width - Fits standard SMA pad layouts; enables drop-in replacement for SMA/SMB variants with minor layout review. |
Applications
| Boost Diode | Blocking Diode |
|---|---|
Use Scenario: Used in non-isolated boost converter output stage to isolate input from output during switch-off. IC Role / Device Role / Timing Role: Unidirectional current path; blocks reverse current from output capacitor back to inductor during low-side switch conduction. Use Value: 0.65 V VF minimizes voltage drop and power loss at 2 A peak, preserving regulation margin and efficiency at light loads. | Use Scenario: Placed between two independent power domains (e.g., battery and USB supply) to prevent backfeed. IC Role / Device Role / Timing Role: Reverse-biased isolation element; conducts only when source voltage exceeds sink by >VF. Use Value: 0.10 mA IR at +25°C ensures negligible quiescent current draw, extending battery runtime in dual-source systems. |
| Recirculating Diode | OR-ing Diode |
Use Scenario: Provides freewheeling path for inductive load current (e.g., solenoid, relay coil) after drive signal removal. IC Role / Device Role / Timing Role: Clamps inductive flyback voltage; conducts transient current until stored energy dissipates. Use Value: 50 A IFSM rating handles short-duration inductive spikes without degradation; 150°C TJ rating supports operation near hot components. | Use Scenario: Enables redundant 12 V power inputs in telecom line cards, selecting higher-voltage source automatically. IC Role / Device Role / Timing Role: Forward-biased conductor when its anode voltage exceeds cathode by >VF; blocks reverse current otherwise. Use Value: Low VF ensures minimal voltage drop between sources, improving load regulation and reducing heat generation in parallel paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB250-E3/54 (Vishay) | Same 50 V VRRM, 2 A IO, but VF = 0.75 V max @ 2 A; RθJA = 100 °C/W. | Higher conduction loss and thermal resistance reduce efficiency in compact, high-ambient designs. | Prefer B250AF-13 where board space or thermal headroom is constrained. |
| SS25 (ON Semiconductor) | 50 V VRRM, 2 A IO, VF = 0.55 V typ @ 2 A, but IR = 0.5 mA @ 50 V, +25°C - 5× higher leakage. | Elevated IR limits use in battery-critical or high-temperature environments. | Choose B250AF-13 for thermally demanding or low-quiescent-current applications. |
Compared with SB250-E3/54 and SS25, B250AF-13 delivers superior thermal performance and tighter leakage control while maintaining identical voltage/current ratings - making it optimal for space-constrained, high-reliability power conversion where efficiency and long-term stability are prioritized.
Availability
B250AF-13 is available at Aetrix Electronics and suitable for DC-DC boost converters, battery backup systems, industrial motor controllers, and telecom OR-ing circuits requiring stable component supply and consistent Schottky performance across temperature.
Supply support for B250AF-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, specializing in high-efficiency power management, signal integrity, and protection solutions.
The B250AF-13 belongs to Diodes' high-reliability Schottky rectifier product line, engineered for robust operation in automotive, industrial, and computing power supplies where low VF, low IR, and extended temperature capability are essential.
FAQ
What is the maximum junction temperature for continuous operation?
The B250AF-13 is rated for continuous operation from −55°C to +150°C junction temperature. At 2 A DC current and +25°C ambient on a standard FR-4 board, junction temperature rises approximately 190°C above ambient due to its 95 °C/W RθJA - so derating or enhanced thermal design is required to stay within the +150°C limit.
Is the B250AF-13 compatible with lead-free reflow soldering?
Yes. The device features a matte tin–annealed copper leadframe and complies with JEDEC J-STD-020 moisture sensitivity level 1. It supports standard Pb-free reflow profiles up to 260°C peak, with no pre-bake required, and meets RoHS 2 (2011/65/EU) and halogen-free definitions per Diodes' green standards.
How does reverse leakage change at elevated temperatures?
At +125°C and 50 V reverse bias, B250AF-13 exhibits ≤0.015 mA typical reverse leakage - significantly lower than many competing Schottky rectifiers. This stability is confirmed in Figure 2 of DS39508 and enables reliable operation in sealed, high-ambient environments without thermal runaway risk.
Can B250AF-13 replace SMA-packaged Schottkys in existing layouts?
Yes - the SMAF package shares identical footprint dimensions (E = 3.95–4.60 mm, D = 2.25–2.95 mm) and pad layout recommendations with standard SMA. However, SMAF has a flatter profile (A = 0.90–1.10 mm vs. SMA's ~1.6 mm height), allowing use in ultra-low-profile assemblies where vertical clearance is limited.
B250AF-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):
- 50 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 650 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 50 V
- Capacitance @ Vr, F:
- 80pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B250AF-13 FAQ
1.How can I place an order for B250AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B250AF-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 B250AF-13 reliable?
The price and inventory of B250AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B250AF-13 is usually 5 days.
3.What payment methods are accepted for B250AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B250AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B250AF-13?
B250AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B250AF-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 B250AF-13?
For technical support, including B250AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B250AF-13 requirements.
6.How does Aetrix verify that B250AF-13 is sourced from the original manufacturer or authorized distributors?
All B250AF-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 B250AF-13 meets industry standards.
7.What is the process for return or replacement of B250AF-13?
All B250AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B250AF-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 B250AF-13 part is unused and in its original packaging.
Return procedure for B250AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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