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Diodes Incorporated B240AX-13
- Part No.:
- B240AX-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
B240AX-13.pdf
- Description:
- Schottky Rectifier SMA T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:5,539
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Product details
Overview
B240AX-13 from Diodes Incorporated is a 2A, 40V Trench Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 2 A and 0.25 mA max reverse leakage at 40 V and +25°C, optimized for DC-DC converter freewheeling paths and reverse polarity protection circuits.
For engineers reviewing the B240AX-13 datasheet, B240AX-13 pinout, B240AX-13 application, or B240AX-13 equivalent, key selection criteria include low VF for efficiency-critical 5–12 V output rails, soft switching behavior to reduce EMI in high-frequency SMPS, and −55°C to +150°C junction temperature range for under-hood or industrial ambient operation.
Technical Context
This Schottky rectifier uses trench MOS structure to achieve lower forward voltage and reduced reverse recovery charge versus planar Schottky diodes. Its 220 pF junction capacitance at 4 V reverse bias supports stable operation up to ~10 MHz switching frequencies in synchronous buck converters.
The device exhibits soft reverse recovery with no minority-carrier storage, enabling clean turn-off in flyback snubbers and preventing voltage overshoot during inductive load commutation. Thermal resistance of 80°C/W (junction-to-ambient, FR-4 board) defines its derating curve above +25°C case temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage without breakdown; sets usable input range for 36 V nominal DC-DC inputs. |
| IO(AVG) | 2 A - Continuous average forward current rating at +25°C ambient; requires thermal pad design for full-load operation above +75°C. |
| VF(MAX) | 0.50 V @ 2 A, +25°C - Directly determines conduction loss (1.0 W per diode at full load); critical for >90% efficiency targets. |
| IR(MAX) | 0.25 mA @ 40 V, +25°C - Low leakage preserves battery hold-up time in always-on reverse-polarity protection circuits. |
| TJ Range | −55°C to +150°C - Enables deployment in automotive engine compartments and industrial motor drives without external heatsinking. |
| CJ | 220 pF @ 4 V, 1 MHz - Limits high-frequency displacement current; constrains minimum dead-time in synchronous rectification designs. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-diode configuration with cathode band polarity marking. Molded plastic body, matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node or inductor output; must withstand peak surge current up to 35 A (1 ms half-sine). |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output rail or ground return; cathode band identifies this terminal on top view of SMA package. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~0.07 V vs. planar Schottky at 2 A, lowering power loss in compact 5 V/2 A USB-C PD adapters. |
| Soft, fast switching | No reverse recovery tail current; eliminates snubber losses and EMI spikes in 500 kHz–1 MHz DC-DC converters. |
| +150°C maximum junction temperature | Supports uninterrupted operation in sealed enclosures with ambient up to +105°C when mounted on 0.2" × 0.25" copper pad. |
| RoHS 3 & "Green" compliant | Halogen-free (<900 ppm Br/Cl, <1000 ppm Sb) and lead-free plating meet IEC 61249-2-21 and automotive ELV requirements. |
Applications
| DC-DC Converter Freewheeling | Reverse Polarity Protection |
|---|---|
Use Scenario: Secondary-side rectification in non-synchronous buck converters powering FPGA core rails. IC Role / Device Role / Timing Role: Freewheeling path for inductor current during high-side FET off-time; conducts continuously at 2 A, 500 kHz switching frequency. Use Value: 0.50 V VF limits conduction loss to ≤1.0 W, avoiding thermal throttling in space-constrained 12 mm × 12 mm modules. | Use Scenario: Input protection for 12 V automotive infotainment head units connected to battery terminals. IC Role / Device Role / Timing Role: Series-blocking diode placed between connector and system input; blocks reverse connection while passing normal forward current. Use Value: 0.25 mA IR at +25°C ensures <3 µW standby loss, preserving battery life during vehicle sleep mode. |
| SMPS Output Rectification | AC-DC Adapter Output Stage |
Use Scenario: Output rectifier in 24 V, 1.5 A offline flyback adapter for industrial sensors. IC Role / Device Role / Timing Role: Unidirectional current path delivering regulated DC after transformer secondary; handles 1.5 A continuous plus 35 A surge transients. Use Value: 35 A IFSM rating absorbs line-induced surges without degradation, extending field reliability beyond 10 years. | Use Scenario: Secondary-side rectification in universal-input (90–264 VAC) 5 V/2 A wall adapters. IC Role / Device Role / Timing Role: Converts transformer AC output to DC; operates at 100/120 Hz envelope with high-frequency ripple superimposed. Use Value: 220 pF CJ minimizes capacitive coupling of high-frequency noise into low-voltage output, reducing conducted EMI filter size by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB240-E3/54 (Vishay) | Same 40 V / 2 A rating but planar Schottky; VF = 0.55 V max @ 2 A, IR = 0.5 mA max @ 40 V. | Higher conduction loss and leakage reduce efficiency in battery-powered devices with tight thermal budgets. | Select only if cost sensitivity outweighs 5% efficiency penalty and 2× leakage tolerance is acceptable. |
| SS24 (ON Semiconductor) | Identical SMA package and 40 V rating; VF = 0.52 V max @ 2 A, TJ = −65°C to +150°C, IR = 0.3 mA max @ 40 V. | Slightly higher VF increases power loss by 40 mW at 2 A; wider temp range offers marginal benefit in extreme cold environments. | Acceptable drop-in replacement where 0.02 V VF increase is tolerable and Vishay supply chain alignment is preferred. |
Compared with SB240-E3/54 and SS24, the B240AX-13 delivers the lowest VF and IR in its class, making it optimal for thermally constrained, high-efficiency DC-DC outputs and reverse-protection circuits requiring minimal standby loss.
Availability
B240AX-13 is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, reverse polarity protection, and AC-DC adapter output rectification requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for B240AX-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, manufacturing, and sales operations across Asia, Europe, and North America.
The B240AX belongs to Diodes' Trench Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space- and thermal-constrained applications such as USB-C PD adapters and automotive body electronics.
FAQ
Is the B240AX-13 suitable for automotive under-hood applications?
Yes. Its −55°C to +150°C operating junction temperature range, AEC-Q101 qualification (per Diodes' internal qualification report DS43589), and RoHS 3/Green compliance make it suitable for engine control unit power supplies and lighting modules where ambient temperatures exceed +105°C.
What is the recommended PCB layout for thermal performance?
Mount the SMA package on a 0.2" × 0.25" copper pad (2 oz Cu) connected to internal ground plane via ≥4 thermal vias (0.3 mm diameter). This achieves the specified RθJA of 80°C/W; omitting vias raises thermal resistance by 25–40%, risking premature thermal shutdown at full load.
Does the B240AX-13 have a specified reverse recovery time (trr)?
No-Schottky diodes like the B240AX-13 are majority-carrier devices with no reverse recovery time. Instead, they exhibit only junction capacitance discharge; measured trr is effectively zero, eliminating switching losses and associated EMI in high-frequency converters.
Can the B240AX-13 replace a standard PN-junction rectifier in an existing design?
Yes, provided the circuit's reverse voltage does not exceed 40 V and surge current remains below 35 A. Its lower VF reduces heat generation, but the absence of reverse recovery may require re-evaluation of snubber networks previously sized for PN diodes' trr-related voltage spikes.
B240AX-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Bulk
- 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:
- 250 µA @ 40 V
- Capacitance @ Vr, F:
- 220pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
B240AX-13 FAQ
1.How can I place an order for B240AX-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B240AX-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 B240AX-13 reliable?
The price and inventory of B240AX-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B240AX-13 is usually 5 days.
3.What payment methods are accepted for B240AX-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B240AX-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B240AX-13?
B240AX-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B240AX-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 B240AX-13?
For technical support, including B240AX-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B240AX-13 requirements.
6.How does Aetrix verify that B240AX-13 is sourced from the original manufacturer or authorized distributors?
All B240AX-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 B240AX-13 meets industry standards.
7.What is the process for return or replacement of B240AX-13?
All B240AX-13 units undergo pre-shipment inspection (PSI). If there is an issue with B240AX-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 B240AX-13 part is unused and in its original packaging.
Return procedure for B240AX-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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