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Diodes Incorporated B140AF-13
- Part No.:
- B140AF-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
B140AF-13.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SMAF
- Quantity:
- Payment:
- Shipping:
Inventory:9,296
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Product details
Overview
B140AF-13 from Diodes Incorporated is a 40 V, 1 A surface-mount Schottky barrier rectifier in SMAF package, featuring 0.5 V max forward voltage at 1 A and 0.2 mA max reverse leakage at 40 V/25°C, optimized for boost, blocking, and recirculating diode functions in DC-DC converters and power supplies.
For engineers reviewing the B140AF-13 datasheet, B140AF-13 pinout, B140AF-13 application, or B140AF-13 equivalent, key selection criteria include low VF for efficiency, high-temperature IR stability, SMAF thermal resistance (RθJA = 95°C/W), RoHS/Green compliance, and 30 A non-repetitive surge rating.
Technical Context
This Schottky rectifier uses a planar epitaxial construction to achieve low forward voltage drop and controlled reverse leakage across -55°C to +150°C operating range. Its junction capacitance is 50 pF at 4 V/1 MHz, supporting high-frequency switching in SMPS topologies.
The device operates with no minority-carrier storage, enabling zero reverse recovery time (trr ≈ 0 ns) and eliminating switching losses associated with PN junction recovery. It is rated for 8.3 ms half-sine surge current up to 30 A under standard test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for blocking capability in 24 V systems. |
| IO(AV) | 1 A - Continuous average forward current at TA = 25°C; derates to ~0.6 A at 100°C ambient per Figure 4. |
| VF(max) | 0.5 V @ 1 A, 25°C - Low conduction loss improves converter efficiency and reduces thermal stress on PCB traces. |
| IR(max) | 0.2 mA @ 40 V, 25°C - Tight leakage spec ensures stable operation in high-temp environments without thermal runaway risk. |
| RθJA | 95 °C/W - Thermal resistance from junction to ambient on FR-4 board; defines minimum copper pad area needed for thermal management. |
| IFSM | 30 A - Non-repetitive surge rating supports inrush current handling in power-up sequences and fault transients. |
| CT | 50 pF @ 4 V, 1 MHz - Junction capacitance impacts high-frequency switching noise and EMI filter design in buck/boost stages. |
Pinout & Package
Package: SMAF (Surface Mount Axial Flat), molded plastic case with matte tin–annealed copper leadframe, cathode band marking, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node in boost, input in blocking configuration). |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; ties to output rail or inductor return path; withstands up to 40 V reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | 0.5 V max at 1 A/25°C enables >95% efficiency in 5–24 V DC-DC stages and reduces heat sink requirements. |
| High-temperature leakage control | 0.10 mA max at 40 V/125°C prevents thermal runaway in enclosed or high-ambient environments. |
| Zero reverse recovery time | No minority carrier storage eliminates switching loss and EMI spikes during turn-off in high-frequency converters. |
| Green, RoHS-compliant construction | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets global environmental compliance mandates. |
Applications
| Boost Diode | Blocking Diode |
|---|---|
Use Scenario: Used in step-up DC-DC converters to transfer energy from 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. Use Value: Low VF minimizes voltage drop across diode, preserving output regulation and improving light-load efficiency. | Use Scenario: Placed between battery and system rail to prevent backflow during battery swap or charger disconnect. IC Role / Device Role / Timing Role: Reverse polarity protection element; blocks current when source voltage falls below load voltage. Use Value: 40 V VRRM supports 24 V battery systems with margin; low IR avoids standby drain in always-on applications. |
| Recirculating Diode | OR-ing Diode |
Use Scenario: Freewheeling path for inductive loads (e.g., solenoids, relays, motor windings) during de-energization. IC Role / Device Role / Timing Role: Provides low-impedance path for stored magnetic energy to dissipate safely. Use Value: Zero trr eliminates voltage overshoot spikes that could damage driving MOSFETs or cause EMI failures. | Use Scenario: Enables redundant power inputs (e.g., main + backup supply) by allowing current from higher-voltage rail only. IC Role / Device Role / Timing Role: Passive OR-ing element; conducts when its anode voltage exceeds cathode by >VF. Use Value: 1 A rating and low VF reduce insertion loss and thermal rise in dual-supply redundancy schemes. |
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 SMA package, but 40 V VRRM and 1 A IO; VF = 0.5 V @ 1 A, IR = 0.2 mA @ 40 V - identical electrical specs. | Identical footprint and performance; differs only in part numbering and minor process revision. | Select SS14 if preferred for long-term availability or existing BOM alignment with Diodes' standard series. |
| MBR140 (ON Semiconductor) | SMA package, 40 V VRRM, 1 A IO; VF = 0.55 V @ 1 A, IR = 0.5 mA @ 40 V - higher VF and leakage than B140AF-13. | Acceptable in less thermally constrained designs; may require larger copper area or lower ambient due to higher IR at 125°C. | Choose MBR140 only when cross-manufacturer sourcing is required and 50 mV VF penalty and 2.5× leakage are acceptable. |
Compared with SS14, B140AF-13 offers identical performance and compatibility; versus MBR140, it delivers superior thermal stability and 10% lower conduction loss, making it preferable for high-efficiency or high-temperature deployments.
Availability
B140AF-13 is available at Aetrix Electronics and suitable for DC-DC converters, battery-powered equipment, industrial power supplies, and automotive body electronics requiring stable component supply and consistent parametric performance across temperature.
Supply support for B140AF-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, cost-effective solutions for power management, signal integrity, and protection.
The B140AF-13 belongs to Diodes' Schottky rectifier product line, engineered for high-efficiency, high-reliability rectification in space-constrained, thermally demanding applications such as portable power and automotive subsystems.
FAQ
What is the maximum junction temperature for continuous operation?
The B140AF-13 has an operating junction temperature range of –55°C to +150°C. For reliable long-term operation, junction temperature must remain ≤150°C under worst-case power dissipation and ambient conditions, verified using RθJA = 95°C/W and measured VF/IR values at elevated temperatures.
Is B140AF-13 suitable for use in automotive applications?
Yes - B140AF-13 meets AEC-Q101 stress test requirements for discrete semiconductors and is qualified for under-hood and cabin applications including body control modules and infotainment power rails, provided thermal design maintains TJ ≤150°C and voltage derating accounts for load dump transients.
Does this device have a specified reverse recovery time (trr)?
No - as a Schottky barrier rectifier, B140AF-13 exhibits no minority carrier storage and therefore has effectively zero reverse recovery time (trr ≈ 0 ns), confirmed by absence of trr specification in DS39504 and typical waveform measurements showing instantaneous turn-off without tail current.
What is the recommended PCB pad layout for optimal thermal performance?
Per Diodes' package outline documentation, use a 0.2" × 0.25" (5.08 mm × 6.35 mm) copper pad on FR-4 with 2 oz copper weight. Include thermal vias under the cathode pad to inner ground planes to reduce RθJA; avoid solder mask over thermal pads unless specified otherwise in the assembly drawing.
B140AF-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):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 50pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAF
- Operating Temperature - Junction:
- -55°C ~ 150°C
B140AF-13 FAQ
1.How can I place an order for B140AF-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B140AF-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 B140AF-13 reliable?
The price and inventory of B140AF-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B140AF-13 is usually 5 days.
3.What payment methods are accepted for B140AF-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B140AF-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B140AF-13?
B140AF-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B140AF-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 B140AF-13?
For technical support, including B140AF-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B140AF-13 requirements.
6.How does Aetrix verify that B140AF-13 is sourced from the original manufacturer or authorized distributors?
All B140AF-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 B140AF-13 meets industry standards.
7.What is the process for return or replacement of B140AF-13?
All B140AF-13 units undergo pre-shipment inspection (PSI). If there is an issue with B140AF-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 B140AF-13 part is unused and in its original packaging.
Return procedure for B140AF-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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