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Diodes Incorporated B240AF-13
- Part No.:
- B240AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B240AF-13.pdf
- Description:
- DIODE SCHOTTKY 40V 2A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
B240AF-13 from Diodes Incorporated is a 40 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 40 V/25°C, optimized for high-efficiency DC-DC boost stages and recirculation paths in power supplies and LED drivers.
For engineers reviewing the B240AF-13 datasheet, B240AF-13 pinout, B240AF-13 application, or B240AF-13 equivalent, key selection criteria include forward voltage drop at full load, high-temperature reverse leakage stability, thermal resistance (RθJA = 90°C/W), and RoHS-compliant green packaging for industrial and automotive-grade power conversion designs.
Technical Context
This Schottky rectifier uses a platinum-silicide or similar low-barrier metal-semiconductor junction to achieve low VF and fast switching with no minority-carrier storage delay. Its design targets continuous conduction mode (CCM) operation in 100 kHz–1 MHz switching converters where forward loss dominates efficiency.
Thermal performance is defined by a 90°C/W junction-to-ambient resistance on standard FR-4 PCBs (0.4" × 0.5", 2 oz Cu), and reverse leakage remains tightly controlled up to +125°C - critical for reliability in enclosed or thermally constrained environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin for 24 V input systems with transients. |
| IO(AV) | 2 A - Average rectified output current; supports continuous 2 A DC output in boost or flyback secondary paths. |
| VF(max) | 0.50 V @ 2 A, 25°C - Low conduction loss enables >95% efficiency in 5–12 V output converters at full load. |
| IR(max) | 0.20 mA @ 40 V, 25°C - Minimal leakage preserves efficiency and prevents thermal runaway in high-temp ambient conditions. |
| RθJA | 90 °C/W - Junction-to-ambient thermal resistance on standard PCB; requires <18°C ambient rise at 2 A full load. |
| CT | 93 pF @ 4 V, 1 MHz - Low junction capacitance minimizes switching loss and EMI in high-frequency topologies. |
Pinout & Package
Package: SMAF (Surface-Mount Axial Flat), molded plastic case with matte tin–annealed copper leadframe, UL 94V-0 rated, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node or transformer secondary; must handle 50 A non-repetitive surge during startup. |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output capacitor or load; cathode band marks this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at full current | 0.50 V max @ 2 A ensures ≤1 W conduction loss, reducing heatsink requirements in space-constrained modules. |
| Stable high-temp IR | 0.03 mA @ 45 V/125°C confirms robustness in under-hood or enclosed power supply applications. |
| Green RoHS compliance | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets IPC-1752A Tier 1 reporting. |
| SMAF mechanical robustness | 0.036 g weight and 0.2" × 0.25" pad layout support automated placement and reflow reliability per J-STD-020 Level 1. |
Applications
| Boost Converter Diode | LED Driver Recirculation |
|---|---|
Use Scenario: High-frequency (500 kHz) boost converter stepping 12 V to 24 V in industrial control power rails. IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; defines minimum duty cycle and output ripple. Use Value: 0.50 V VF reduces conduction loss by 35% vs. standard PN diodes, enabling higher efficiency without forced air cooling. | Use Scenario: Constant-current LED driver with PWM dimming for street lighting modules operating at 85°C ambient. IC Role / Device Role / Timing Role: Recirculation path for inductor current during PWM off-phase; clamps back-EMF and maintains current continuity. Use Value: Stable 0.03 mA IR at 125°C prevents thermal runaway and ensures consistent dimming linearity over lifetime. |
| Solar Charge Controller Blocking | USB-C Power Delivery Clamp |
Use Scenario: 24 V solar panel input stage preventing battery discharge through PV array at night. IC Role / Device Role / Timing Role: Reverse-blocking diode isolating battery from open-circuit PV string; conducts only during daylight charging. Use Value: 40 V VRRM provides 2× margin over 24 V nominal system, while low VF avoids voltage drop that would reduce charge acceptance. | Use Scenario: Overvoltage clamp in USB-C PD sink circuit protecting 20 V input rails from transient surges. IC Role / Device Role / Timing Role: Fast-recovery clamp diode shunting >24 V spikes to ground; activated within nanoseconds of overvoltage event. Use Value: 93 pF junction capacitance limits clamping delay, and 50 A IFSM withstands repeated 10/1000 µs surge events per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB240-E3/52 | Same 40 V/2 A rating but DO-214AA package; RθJA ≈ 75°C/W; VF = 0.52 V max @ 2 A. | Through-hole mounting; better thermal dissipation but incompatible with SMT-only lines. | Select when board-level rework or manual assembly is required and thermal margin is tighter than 90°C/W allows. |
| SS24 | 40 V/2 A SMA package; VF = 0.55 V max @ 2 A; IR = 0.5 mA @ 40 V/25°C - 2.5× higher leakage. | Lower cost but reduced high-temp reliability; not recommended above 85°C ambient. | Acceptable for consumer-grade indoor applications where cost outweighs long-term thermal stability. |
Compared with SB240-E3/52 and SS24, B240AF-13 delivers superior thermal management on standard SMT layouts and lower leakage for extended life in thermally aggressive environments - making it optimal for industrial and outdoor-rated power systems.
Availability
B240AF-13 is available at Aetrix Electronics and suitable for boost converters, LED drivers, solar charge controllers, and USB-C PD protection circuits requiring stable component supply across multi-year production cycles.
Supply support for B240AF-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, serving industrial, computing, communications, and consumer markets since 1959.
The B240AF-13 belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for high-efficiency, high-temperature power conversion in compact SMT form factors.
FAQ
What is the maximum junction temperature for continuous operation of B240AF-13?
The B240AF-13 has an operating junction temperature range of –55°C to +150°C. For continuous 2 A operation, thermal design must ensure TJ does not exceed +150°C - typically limiting ambient temperature to ≤132°C given RθJA = 90°C/W and 1 W typical power dissipation.
Is B240AF-13 suitable for use in automotive under-hood applications?
Yes - its guaranteed IR ≤ 0.03 mA at 45 V/125°C and qualified operation to +150°C make it suitable for under-hood environments, provided PCB layout meets thermal derating curves (Figure 4) and peak surge currents remain below 50 A.
Does B240AF-13 require a heatsink in standard SMT applications?
No heatsink is required for 2 A DC operation on standard FR-4 PCBs with 0.2" × 0.25" copper pads. The 90°C/W RθJA allows ≤18°C temperature rise above ambient, well within safe limits for most industrial enclosures without forced airflow.
How does the SMAF package differ from SMA in mechanical compatibility?
SMAF is a flat-profile variant of SMA with reduced height (max 1.10 mm vs. SMA's ~2.3 mm) and tighter dimensional tolerances. It uses identical pad layout and solder profile but offers improved board-level reliability in vibration-prone applications due to lower center of gravity and enhanced adhesion.
B240AF-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):
- 40 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 @ 40 V
- Capacitance @ Vr, F:
- 93pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B240AF-13 FAQ
1.How can I place an order for B240AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B240AF-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 B240AF-13 reliable?
The price and inventory of B240AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B240AF-13 is usually 5 days.
3.What payment methods are accepted for B240AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B240AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B240AF-13?
B240AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B240AF-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 B240AF-13?
For technical support, including B240AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B240AF-13 requirements.
6.How does Aetrix verify that B240AF-13 is sourced from the original manufacturer or authorized distributors?
All B240AF-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 B240AF-13 meets industry standards.
7.What is the process for return or replacement of B240AF-13?
All B240AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B240AF-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 B240AF-13 part is unused and in its original packaging.
Return procedure for B240AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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