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Diodes Incorporated B140AX-13
- Part No.:
- B140AX-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
B140AX-13.pdf
- Description:
- SCHOTTKY RECTIFIER SMA T&R 5K
- Quantity:
- Payment:
- Shipping:
Inventory:4,535
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Product details
Overview
B140AX-13 from Diodes Incorporated is a 1A, 40V Trench Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 1.0 A and 0.1 mA max reverse leakage at 40 V and +25°C, optimized for high-frequency DC-DC converters and freewheeling applications in power supplies.
For engineers reviewing the B140AX-13 datasheet, B140AX-13 pinout, B140AX-13 application, or B140AX-13 equivalent, key selection criteria include low VF for efficiency, soft switching for EMI control, 150°C junction rating for thermal robustness, and RoHS-compliant lead-free plating for industrial and automotive-qualified designs.
Technical Context
This discrete Schottky diode uses trench-based silicon structure to achieve lower forward voltage and faster recovery than planar Schottky devices, with soft reverse recovery characteristics critical for reducing switching noise in high-frequency SMPS topologies.
It operates across –55°C to +150°C junction temperature range, with thermal resistance of 80°C/W (junction-to-ambient, FR-4 board) and 30°C/W (junction-to-case), enabling reliable performance in compact, thermally constrained PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in polarity protection and reverse-bias blocking circuits. |
| IO | 1 A - Average rectified forward current; supports continuous conduction mode operation in 1A-output DC-DC converters. |
| VF (max) | 0.50 V @ 1.0 A, +25°C - Low conduction loss enables >95% efficiency in low-voltage buck stages and synchronous rectifier auxiliary paths. |
| IR (max) | 0.1 mA @ 40 V, +25°C - Minimal leakage preserves battery life in always-on reverse-polarity protection and standby power rails. |
| TJ Range | –55°C to +150°C - Enables deployment in under-hood automotive modules and industrial motor drives without derating. |
| RθJA | 80°C/W - Specifies thermal rise on standard FR-4 PCB; informs heatsinking requirements for sustained 1A load at ambient >70°C. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-diode configuration with cathode band polarity indicator. Molded plastic body, matte tin-plated terminals, 0.064 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to input/source side in rectification; must be routed with low-inductance trace to minimize voltage spikes during switching. |
| Cathode | Forward current exit node / reverse-blocking terminal | Marked by band; ties to output/load ground or return path; determines polarity protection direction and freewheeling current path. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~10–15% vs. planar Schottky at 1A, directly improving power stage efficiency in 3.3V/5V DC-DC outputs. |
| Soft, fast switching | Minimizes reverse recovery dv/dt and ringing, lowering EMI filter component count in Class B/C power supplies. |
| +150°C maximum junction temperature | Supports operation in sealed enclosures or near heat sources without thermal shutdown in industrial PLC I/O modules. |
| RoHS-compliant, halogen- and antimony-free | Meets IPC-1752A material declaration requirements for EU medical and telecom equipment compliance. |
Applications
| SMPS Secondary Rectification | Reverse Polarity Protection |
|---|---|
Use Scenario: Output rectification in isolated flyback or forward converters delivering ≤1A at 3.3V–12V. IC Role / Device Role / Timing Role: Uncontrolled rectifier replacing synchronous MOSFETs where cost and simplicity outweigh marginal efficiency gain. Use Value: 0.50 V VF limits conduction loss to <500 mW, avoiding thermal derating below 1A even at +100°C ambient. | Use Scenario: Input-side protection for USB-powered peripherals and battery-backed sensors. IC Role / Device Role / Timing Role: Series-blocking diode preventing damage from misconnected DC adapters or swapped battery terminals. Use Value: 0.1 mA IR at +25°C ensures <1 µW standby power loss, preserving months of shelf life in coin-cell IoT nodes. |
| Freewheeling Diode | DC-DC Converter Catch Diode |
Use Scenario: Inductive load flyback path in solenoid drivers and relay interface boards. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during switch-off phase of N-channel MOSFET drivers. Use Value: Soft recovery suppresses voltage overshoot beyond 40 V, eliminating need for snubbers in 24V industrial control outputs. | Use Scenario: Synchronous buck converter catch diode in point-of-load regulators for FPGA core supplies. IC Role / Device Role / Timing Role: Freewheeling path during high-side FET off-time; complements controller IC timing with sub-10 ns reverse recovery. Use Value: 0.42 V typical VF at +25°C reduces average power dissipation by 30% vs. standard PN diodes, lowering local PCB temperature rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS14 (Diodes Inc.) | Same 40 V / 1 A rating but planar Schottky; VF = 0.55 V max; IR = 0.5 mA max at 40 V. | Higher VF increases conduction loss by ~100 mW at 1A; higher IR reduces suitability for ultra-low-power reverse protection. | Select SS14 only if legacy design compatibility or lower unit cost outweighs efficiency and leakage penalties. |
| MBR140 (ON Semiconductor) | Identical 40 V / 1 A specs; VF = 0.55 V max; IR = 0.5 mA max; TO-277 package (smaller footprint than SMA). | TO-277 has lower RθJA (65°C/W) but requires different pad layout; higher IR limits use in battery-critical reverse protection. | Choose MBR140 when board space is constrained and thermal performance on dense layouts is prioritized over leakage-sensitive applications. |
Compared with SS14 and MBR140, B140AX-13 delivers the lowest VF and IR in its class, making it optimal for thermally sensitive, high-efficiency, or ultra-low-leakage DC-DC and protection circuits-especially where 0.1 mA IR and 0.50 V VF directly impact system-level power budget and reliability.
Availability
B140AX-13 is available at Aetrix Electronics and suitable for SMPS secondary rectification, reverse polarity protection, and freewheeling diode applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for B140AX-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, energy-efficient components for power management, signal integrity, and protection.
B140AX-13 belongs to Diodes' Trench Schottky Rectifier product line, engineered specifically for high-frequency, low-loss power conversion in space-constrained consumer, industrial, and automotive systems.
FAQ
What is the maximum surge current rating for B140AX-13?
The non-repetitive peak forward surge current (IFSM) is 20 A for a 1 ms half-sine wave at rated load. This rating applies to transient overload conditions such as inrush current in DC-DC inputs or motor startup events, provided junction temperature remains within –55°C to +150°C limits and thermal mass prevents cumulative heating.
Does B140AX-13 meet AEC-Q101 requirements for automotive use?
No-B140AX-13 is not AEC-Q101 qualified. Diodes Incorporated offers automotive-grade variants (e.g., B140AHE3) with PPAP documentation and IATF 16949 manufacturing, but B140AX-13 is intended for industrial and commercial applications per its datasheet scope and qualification statements.
How does the SMA package affect thermal performance in high-current operation?
With RθJA = 80°C/W on a standard FR-4 board (0.4" × 0.5", 2 oz copper), B140AX-13 reaches ~130°C junction temperature at 1A and +70°C ambient. For sustained 1A operation above +70°C, thermal relief via larger copper pours or adjacent thermal vias is recommended to maintain reliability within the +150°C TJ limit.
Can B140AX-13 replace a standard PN junction rectifier like 1N4007?
Yes, but only in low-voltage (≤40 V), high-frequency applications. Unlike the 1N4007 (1000 V, slow recovery), B140AX-13 offers lower VF and faster switching, yet lacks high-voltage blocking. It is unsuitable for AC-DC front-end rectification but ideal for secondary-side or DC-DC freewheeling where 40 V rating and efficiency matter.
B140AX-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
B140AX-13 FAQ
1.How can I place an order for B140AX-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B140AX-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 B140AX-13 reliable?
The price and inventory of B140AX-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B140AX-13 is usually 5 days.
3.What payment methods are accepted for B140AX-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B140AX-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B140AX-13?
B140AX-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B140AX-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 B140AX-13?
For technical support, including B140AX-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B140AX-13 requirements.
6.How does Aetrix verify that B140AX-13 is sourced from the original manufacturer or authorized distributors?
All B140AX-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 B140AX-13 meets industry standards.
7.What is the process for return or replacement of B140AX-13?
All B140AX-13 units undergo pre-shipment inspection (PSI). If there is an issue with B140AX-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 B140AX-13 part is unused and in its original packaging.
Return procedure for B140AX-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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