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Diodes Incorporated B245AF-13
- Part No.:
- B245AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B245AF-13.pdf
- Description:
- DIODE SCHOTTKY 45V 2A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:2,126
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Product details
Overview
B245AF-13 from Diodes Incorporated is a 45 V, 2 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.50 V max forward voltage at 2 A and 0.20 mA max reverse leakage at 45 V/25°C, optimized for high-efficiency DC-DC boost stages and recirculating paths in industrial power supplies.
For engineers reviewing the B245AF-13 datasheet, B245AF-13 pinout, B245AF-13 application, or B245AF-13 equivalent, key selection criteria include its low VF stability up to +125°C, thermal resistance (RθJA = 90°C/W), junction capacitance (93 pF @ 4 V), and RoHS-compliant matte tin terminations on copper leadframe.
Technical Context
This Schottky rectifier uses a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve minimal conduction loss and fast switching recovery (no minority-carrier storage). Its design targets continuous forward conduction under 2 A DC load with minimal self-heating, supported by RθJC = 45°C/W to case.
Reverse blocking performance is specified up to 45 V with IR ≤ 0.20 mA at +25°C and ≤ 0.03 mA at +125°C, ensuring stable operation in thermally demanding environments such as enclosed power converters and automotive under-hood modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for input-side blocking in 36 V nominal systems. |
| IO | 2 A - Continuous average forward current rating; defines usable output capacity in steady-state rectification. |
| VF (max) | 0.50 V @ 2 A, 25°C - Directly determines I²R conduction loss; enables >92% efficiency in 5 V–12 V buck-derived rails. |
| IR (max) | 0.20 mA @ 45 V, 25°C - Low leakage preserves standby power budget and prevents thermal runaway at elevated ambient temperatures. |
| RθJA | 90 °C/W - Thermal resistance to ambient on standard FR-4 PCB; used to calculate junction temperature rise under real load conditions. |
| CT | 93 pF @ 4 V, 1 MHz - Junction capacitance affects high-frequency switching noise and EMI filtering requirements in SMPS designs. |
Pinout & Package
Package: SMAF (Surface Mount Axial Flat) - Molded plastic case, UL 94V-0 rated, 0.036 g weight, cathode band polarity marking, matte tin over copper leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in boost topology); requires thermal pad connection for heat dissipation. |
| Cathode | Forward current exit / reverse blocking terminal | Connected to higher-potential rail (e.g., output capacitor positive); marked with visible band; carries full output current path. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.50 V max @ 2 A ensures <1 W conduction loss at full load, reducing thermal stress in compact layouts. |
| High-temperature reverse leakage control | IR ≤ 0.03 mA @ 45 V, +125°C maintains system reliability without derating in hot environments. |
| Lead-free and green compliant | Meets RoHS 2 and halogen/antimony-free standards (<900 ppm Br/Cl, <1000 ppm Sb), supporting eco-design compliance. |
| SMAF package thermal performance | RθJC = 45°C/W enables direct heat transfer to PCB copper, critical for sustained 2 A operation without heatsink. |
Applications
| Boost Diode | Blocking Diode |
|---|---|
Use Scenario: Used in non-isolated DC-DC boost converters to transfer energy from input inductor to output capacitor during switch-off phase. IC Role / Device Role / Timing Role: Unidirectional current valve enabling energy transfer; conducts only when switch is off and inductor voltage exceeds output rail. Use Value: Low VF minimizes voltage drop across diode, preserving conversion efficiency; low CT reduces high-frequency ringing during turn-off. | Use Scenario: Placed between two power domains (e.g., battery and USB supply) to prevent backflow during source switchover. IC Role / Device Role / Timing Role: Reverse-biased isolation element; blocks current when secondary source is inactive or lower voltage. Use Value: Low IR ensures negligible standby drain; 45 V rating supports 36 V battery systems with margin for transients. |
| Recirculating Diode | Freewheeling Diode in Motor Drive |
Use Scenario: Provides current path for inductive kickback in relay drivers, solenoid controls, and DC-DC synchronous rectifier dead-time recovery. IC Role / Device Role / Timing Role: Fast-recovery freewheeling path; conducts only during inductive flyback event after main switch turns off. Use Value: Schottky architecture eliminates minority-carrier delay, minimizing voltage overshoot and EMI generation. | Use Scenario: Integrated into H-bridge motor driver PCBs to clamp inductive back-EMF during PWM commutation. IC Role / Device Role / Timing Role: Bidirectional clamping device during PWM off-time; handles peak currents exceeding 2 A for short durations. Use Value: IFSM = 50 A rating withstands motor stall surges; low VF reduces heat buildup during continuous PWM operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB240-E3/52T | Same 40 V VRRM, but 0.55 V VF max @ 2 A; SMA package (larger footprint than SMAF). | Higher VF increases conduction loss by ~100 mW at 2 A; less suitable for space-constrained thermal designs. | Select if existing layout uses SMA footprint and 40 V rating suffices. |
| SS24HE3_A/H | 40 V VRRM, 2 A IO, 0.55 V VF max @ 2 A; same SMAF package; slightly higher IR (0.5 mA @ 40 V). | Lower reverse voltage margin and higher leakage reduce suitability in 36 V systems with transient spikes. | Prefer for cost-sensitive consumer applications where 40 V margin and moderate leakage are acceptable. |
Compared with SB240-E3/52T and SS24HE3_A/H, B245AF-13 delivers superior 45 V blocking headroom, lower VF, and tighter IR spec-making it optimal for industrial 36 V bus systems requiring long-term thermal stability and minimal conduction loss.
Availability
B245AF-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom DC-DC converters requiring stable component supply with consistent parametric performance across temperature.
Supply support for B245AF-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-reliability power management and signal integrity solutions for industrial, computing, and automotive markets.
The B245AF-13 belongs to Diodes' advanced Schottky rectifier product line, engineered specifically for high-efficiency, high-temperature rectification in compact surface-mount power conversion stages.
FAQ
What is the maximum junction temperature for continuous operation?
The B245AF-13 has an operating junction temperature range of –55°C to +150°C. For continuous 2 A DC operation, junction temperature must remain ≤ +150°C, which requires limiting ambient temperature and PCB copper area per the RθJA = 90°C/W derating curve in Figure 4 of DS39507.
Is the B245AF-13 suitable for synchronous rectification replacement?
No-B245AF-13 is a passive Schottky rectifier and cannot replace active synchronous MOSFETs. It lacks gate control and bidirectional conduction capability. Its role is limited to unidirectional, self-commutated rectification in non-synchronous topologies.
Does this part have a qualified AEC-Q101 rating for automotive use?
No-B245AF-13 is not AEC-Q101 qualified. While its –55°C to +150°C operating range meets automotive ambient requirements, Diodes Incorporated does not list it in their AEC-Q101 qualified portfolio; automotive designs require explicit qualification documentation.
What is the recommended PCB pad layout for thermal performance?
Diodes recommends using the official SMAF pad layout from package-outlines.html, including a 0.2" × 0.25" copper pad with thermal vias to inner ground planes. This matches the test condition (FR-4, 2 oz copper) used to specify RθJA = 90°C/W and ensures validated thermal performance.
B245AF-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):
- 45 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 45 V
- Capacitance @ Vr, F:
- 93pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B245AF-13 FAQ
1.How can I place an order for B245AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B245AF-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 B245AF-13 reliable?
The price and inventory of B245AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B245AF-13 is usually 5 days.
3.What payment methods are accepted for B245AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B245AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B245AF-13?
B245AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B245AF-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 B245AF-13?
For technical support, including B245AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B245AF-13 requirements.
6.How does Aetrix verify that B245AF-13 is sourced from the original manufacturer or authorized distributors?
All B245AF-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 B245AF-13 meets industry standards.
7.What is the process for return or replacement of B245AF-13?
All B245AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B245AF-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 B245AF-13 part is unused and in its original packaging.
Return procedure for B245AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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