My Inquiry
My Account
Diodes Incorporated B540CX-13
- Part No.:
- B540CX-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
B540CX-13.pdf
- Description:
- SCHOTTKY RECTIFIER SMC T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:5,880
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
B540CX-13 from Diodes Incorporated is a 5A, 40V Trench Schottky barrier rectifier in SMC package, featuring 0.52V max forward voltage at 5A/25°C, 0.3mA max reverse leakage at 40V/25°C, and +150°C junction temperature rating-designed for high-frequency DC-DC converter freewheeling paths.
For engineers reviewing the B540CX-13 datasheet, B540CX-13 pinout, B540CX-13 application, or B540CX-13 equivalent, key selection criteria include low VF for efficiency-critical 12V/5V rail clamping, soft switching behavior for EMI-sensitive SMPS designs, and SMC thermal performance under sustained 5A conduction.
Technical Context
This Schottky rectifier uses trench MOS-based anode structure to reduce series resistance and achieve low VF without sacrificing leakage control. Its soft recovery minimizes voltage overshoot during diode turn-off in synchronous buck freewheeling configurations.
Rated for 80A non-repetitive surge current and operating up to +150°C, it supports compact thermal design on FR-4 PCBs with 0.2" × 0.25" copper pads, delivering 50°C/W junction-to-ambient thermal resistance under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operation in 36V nominal DC bus applications. |
| IO (AV) | 5 A - Average forward current rating; supports continuous conduction mode (CCM) operation in 5A-output DC-DC converters. |
| VF (Max) | 0.52 V @ 5A, 25°C - Low forward drop reduces conduction loss by >30% vs. standard PN diodes, critical for <1% efficiency targets. |
| IR (Max) | 0.3 mA @ 40V, 25°C - Low leakage enables stable reverse-bias hold in polarity protection circuits without excessive standby drain. |
| TJ Range | –55°C to +150°C - Extended junction temperature range allows deployment in under-hood automotive power modules and industrial motor drives. |
| RθJA | 50 °C/W - Thermal resistance measured on 0.4" × 0.5", 2oz FR-4 board; determines required copper area for thermal management at full load. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic with matte tin-plated terminals and cathode band polarity indicator. Weight: 0.21 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to switch node (e.g., MOSFET drain) in buck converter freewheel path; must handle 5A RMS with minimal trace heating. |
| Cathode | Forward current exit node / reverse-blocking terminal | Connected to output rail or ground return; cathode band marking ensures correct orientation during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Enables 0.52V VF at 5A while maintaining <0.3mA IR-critical for balancing efficiency and thermal stability in space-constrained converters. |
| Soft, fast switching | Minimizes reverse recovery ringing and EMI generation during discontinuous conduction mode (DCM) transitions in boost/flyback topologies. |
| +150°C operating junction temperature | Supports operation in sealed enclosures or near heat sources without derating, enabling smaller heatsink or no heatsink in 5A applications. |
| RoHS-compliant, halogen-free "Green" construction | Meets IEC 61249-2-21 and JEDEC J-STD-020 Level 1 moisture sensitivity-ensures reliability in lead-free reflow processes. |
Applications
| SMPS Freewheeling Diode | Reverse Polarity Protection |
|---|---|
Use Scenario: Used as the low-side freewheeling diode in 12V-input, 5V/5A synchronous buck converter powering FPGA core rails. IC Role / Device Role / Timing Role: Provides unidirectional current path during high-side MOSFET off-time; conducts 5A continuously with minimal voltage drop. Use Value: 0.52V VF limits conduction loss to ≤2.6W, reducing thermal stress on adjacent ICs and enabling 2-layer PCB layout. | Use Scenario: Placed in series with VBUS line of industrial USB-C PD adapter to prevent damage from miswired input cables. IC Role / Device Role / Timing Role: Blocks reverse current flow when input polarity is inverted; remains reverse-biased at up to 40V. Use Value: 0.3mA max IR at 25°C ensures <15µW standby power dissipation, preserving battery life in always-on systems. |
| DC-DC Converter Output Rectification | Blocking Diode in Solar Charge Controller |
Use Scenario: Output rectifier in isolated 48V-to-12V flyback converter for telecom shelf management units. IC Role / Device Role / Timing Role: Conducts secondary-side current during transformer reset phase; handles 5A peak repetitive current. Use Value: Soft switching behavior suppresses 30–100MHz EMI spikes, easing compliance with CISPR 32 Class B conducted emissions limits. | Use Scenario: Prevents nighttime battery discharge through PV panel strings in off-grid solar lighting systems. IC Role / Device Role / Timing Role: Blocks reverse current from 12V battery back into open-circuit solar array (VOC ≈ 22V). Use Value: 40V VRRM provides 2× margin over 22V VOC, while low VF avoids unnecessary voltage drop in charging path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS54 (ON Semiconductor) | Same 40V/5A rating but higher VF (0.55V max) and higher IR (0.5mA max); SMC package. | Slightly lower efficiency and higher thermal rise in high-duty-cycle applications. | Acceptable where 0.03V VF penalty is tolerable and cost sensitivity outweighs thermal margin. |
| MBR540 (STMicroelectronics) | 40V/5A, VF = 0.55V max, IR = 0.5mA max; same SMC package but not halogen-free. | Lacks "Green" compliance and has reduced leakage margin at elevated temperatures. | Preferred only if legacy qualification to older environmental standards is required. |
Compared with SS54 and MBR540, B540CX-13 delivers superior thermal efficiency (0.52V VF), tighter leakage control (0.3mA), and full halogen/antimony-free compliance-making it optimal for next-generation energy-efficient and environmentally regulated designs.
Availability
B540CX-13 is available at Aetrix Electronics and suitable for SMPS freewheeling, reverse polarity protection, and DC-DC converter output rectification requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for B540CX-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-performance, high-reliability components for power management, signal integrity, and protection applications.
The B540CX belongs to Diodes' Trench Schottky Rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space- and thermally-constrained environments.
FAQ
What is the maximum allowable case temperature for continuous 5A operation?
The B540CX-13 supports continuous 5A conduction up to +150°C junction temperature. With RθJA = 50°C/W and 2.6W power dissipation (5A × 0.52V), case temperature must remain ≤ +20°C above ambient to avoid exceeding TJmax-requiring ≥1.5 cm² of 2oz copper pad per terminal for natural convection cooling.
Is B540CX-13 qualified for automotive applications?
B540CX-13 is not AEC-Q101 qualified out-of-box. Diodes offers automotive-grade variants (e.g., B540CXAQ) with PPAP documentation, IATF 16949 manufacturing, and extended test coverage. Standard B540CX-13 may be used in non-safety-critical automotive subsystems subject to customer qualification.
Does the SMC package support hand soldering?
Yes-the SMC package is compatible with hand soldering using a temperature-controlled iron (≤350°C tip, <3 sec dwell time per terminal). Preheating the board to 100°C and using flux-core solder minimizes thermal shock risk; cathode band orientation must be verified before soldering.
How does junction capacitance affect high-frequency performance?
Junction capacitance is 100–200 pF at 0–40V reverse bias (1 MHz). In 500 kHz–1 MHz DC-DC converters, this capacitance forms a resonant tank with parasitic inductance, potentially causing ringing during turn-off-mitigated by snubber networks or careful PCB layout to minimize loop area.
B540CX-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 520 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 300 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
- Operating Temperature - Junction:
- -55°C ~ 150°C
B540CX-13 FAQ
1.How can I place an order for B540CX-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B540CX-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 B540CX-13 reliable?
The price and inventory of B540CX-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B540CX-13 is usually 5 days.
3.What payment methods are accepted for B540CX-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B540CX-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B540CX-13?
B540CX-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B540CX-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 B540CX-13?
For technical support, including B540CX-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B540CX-13 requirements.
6.How does Aetrix verify that B540CX-13 is sourced from the original manufacturer or authorized distributors?
All B540CX-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 B540CX-13 meets industry standards.
7.What is the process for return or replacement of B540CX-13?
All B540CX-13 units undergo pre-shipment inspection (PSI). If there is an issue with B540CX-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 B540CX-13 part is unused and in its original packaging.
Return procedure for B540CX-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
B540CX-13 Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
