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Diodes Incorporated B340A-13
- Part No.:
- B340A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
B340A-13.pdf
- Description:
- DIODE SCHOTTKY 40V 3A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,574
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Product details
Overview
B340A-13 from Diodes Incorporated is a 40 V, 3.0 A surface-mount Schottky barrier rectifier in SMA package, featuring 0.50 V max forward voltage at 3 A and 0.5 mA max reverse leakage at rated voltage. It delivers low power loss and high efficiency for DC-DC converters, freewheeling paths, and polarity protection circuits in automotive and industrial power supplies.
For engineers reviewing the B340A-13 datasheet, B340A-13 pinout, B340A-13 application, or B340A-13 equivalent, key selection criteria include its 40 V reverse blocking rating, thermal resistance (140 °C/W junction-to-ambient), RoHS-compliant lead-free plating, AEC-Q101 qualification, and cathode-band polarity marking.
Technical Context
The B340A-13 employs guard ring die construction to enhance transient surge immunity and stabilize reverse recovery behavior under fast-switching conditions. Its Schottky architecture eliminates minority-carrier storage, enabling zero reverse recovery time and minimizing switching losses in high-frequency (>100 kHz) topologies.
Designed for surface-mount assembly on FR-4 PCBs with minimum pad layout per AP02001, it operates from –55 °C to +150 °C junction temperature and supports 80 A non-repetitive peak forward surge current (8.3 ms half-sine), making it suitable for inductive load commutation and input rectification in compact power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC bus or output rail voltage in buck/flyback secondary-side rectification. |
| IO(AV) | 3.0 A @ TT = +100°C - Average forward current derated for thermal management; requires ≤100 °C terminal temperature in continuous operation. |
| VF(max) | 0.50 V @ 3.0 A, TA = +25°C - Low conduction loss enables >92% efficiency in 5–12 V output DC-DC converters at full load. |
| IR(max) | 0.5 mA @ 40 V, TA = +25°C - Minimal leakage preserves battery runtime in always-on polarity protection circuits. |
| RθJA | 140 °C/W - Thermal resistance with standard FR-4 mounting; dictates minimum copper area needed to maintain TJ ≤ 150 °C at 3 A. |
| CT | 200 pF @ VR = 4 V, f = 1 MHz - Junction capacitance affects high-frequency EMI and snubber design in SMPS flyback diodes. |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic case with UL 94V-0 flammability rating, matte-tin lead finish, and cathode band polarity marking. Weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in synchronous buck, ground return in polarity protection). |
| Cathode | Forward current exit / reverse-blocking terminal | Marked with band; connects to positive rail or output capacitor; blocks reverse current up to 40 V. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves surge robustness against line transients and inductive kickback without external TVS clamping. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| Lead-free & halogen-free | Meets RoHS 2 (2011/65/EU) and JEDEC J-STD-020 Level 1 moisture sensitivity; compatible with lead-free reflow profiles. |
| Low VF and high IO synergy | Enables compact thermal design in space-constrained 3 A power rails where copper area is limited (e.g., infotainment DC-DC modules). |
Applications
| Automotive Body Control Module (BCM) Power Input Protection | Industrial 24 V DC-DC Converter Secondary Rectification |
|---|---|
Use Scenario: Reverse polarity protection on 12 V supply input to BCM microcontroller and CAN transceiver circuitry. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage during battery jump-start misconnection. Use Value: 0.50 V VF minimizes voltage drop across protection diode, preserving ≥11.5 V at MCU under 2 A load while meeting AEC-Q101 requirements. | Use Scenario: Output rectification in isolated 24 V → 5 V flyback converter powering PLC I/O drivers. IC Role / Device Role / Timing Role: High-frequency freewheeling diode conducting during transformer reset phase. Use Value: Zero reverse recovery eliminates switching spikes, reducing EMI filter component count and enabling 300 kHz operation without snubber. |
| USB-C Power Delivery (PD) Adapter Secondary Side | Medical Portable Device Battery Charging Path |
Use Scenario: Synchronous rectification replacement in 20 V output stage of compact USB-C PD adapter. IC Role / Device Role / Timing Role: Low-loss output rectifier handling up to 3 A continuous current at 20 V output. Use Value: 0.50 V VF reduces conduction loss by 40% vs. standard PN diode, lowering thermal load in sealed adapter enclosure. | Use Scenario: Polarity guard between Li-ion battery pack and charging IC in handheld diagnostic tool. IC Role / Device Role / Timing Role: One-way isolation preventing reverse current flow during hot-plug battery insertion. Use Value: 0.5 mA IR at 40 V ensures <1 µA standby leakage, extending shelf life and avoiding false low-battery detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB340-E3/57T (Vishay) | Same 40 V VRRM, 3 A IO, but VF = 0.55 V max @ 3 A; RθJA = 150 °C/W. | Slightly higher conduction loss and thermal resistance; less margin in thermally constrained layouts. | Select when Vishay's SBx40 series is already qualified in legacy designs and board space matches SMA footprint. |
| SS34 (ON Semiconductor) | 40 V VRRM, 3 A IO, VF = 0.55 V max @ 3 A; not AEC-Q101 qualified; RθJA = 130 °C/W (on optimized pad). | Lacks automotive qualification; better thermal performance only with enhanced copper pour. | Prefer for cost-sensitive industrial or consumer applications where AEC-Q101 is not required and thermal layout can be optimized. |
Compared with SB340-E3/57T and SS34, the B340A-13 offers the lowest VF (0.50 V), AEC-Q101 compliance out-of-box, and consistent 140 °C/W RθJA on standard FR-4-making it optimal for automotive and thermally constrained industrial designs requiring guaranteed reliability and minimal voltage drop.
Availability
B340A-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24 V DC-DC converters, and USB-C power delivery adapters requiring stable component supply and long-term lifecycle support.
Supply support for B340A-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-reliability power management and signal integrity solutions for automotive, industrial, and computing markets.
The B340A-13 belongs to Diodes' B3xxA Schottky rectifier product line, engineered for high-efficiency, high-frequency power conversion in space- and thermal-constrained applications where low VF and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum junction temperature for continuous operation of the B340A-13?
The B340A-13 has a specified operating junction temperature range of –55 °C to +150 °C. For continuous 3.0 A operation, thermal design must ensure TJ does not exceed +150 °C-achievable with ≤100 °C terminal temperature on FR-4 using the recommended pad layout per AP02001 and ambient ≤ +85 °C.
Is the B340A-13 suitable for use in automotive applications?
Yes-the B340A-13 is explicitly qualified to AEC-Q101 standards, covering stress tests such as high-temperature reverse bias, temperature cycling, and ESD. Its guard ring die construction and 150 °C max TJ rating make it approved for under-hood and cabin-mounted automotive power systems including BCMs and ADAS sensor supplies.
How does the cathode band marking align with the SMA package outline?
The cathode band is located on the top surface of the SMA package, aligned with the flat edge of the molded case. Per Diodes' AP02002 mechanical drawing, the band corresponds to the terminal marked "K" in the top-view diagram and is electrically connected to the cathode pin-verified by continuity test to the larger metallized end of the device body.
Can the B340A-13 replace a standard PN rectifier in an existing 24 V power supply?
Yes-its 40 V VRRM exceeds typical 24 V rail transients, and 0.50 V VF reduces conduction loss by ~60% versus a 1N5822 (VF ≈ 0.9 V). However, verify layout thermal relief: the B340A-13's 140 °C/W RθJA requires adequate copper area, and its lack of reverse recovery eliminates snubber needs but may alter EMI signature.
B340A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- 200pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
B340A-13 FAQ
1.How can I place an order for B340A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for B340A-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 B340A-13 reliable?
The price and inventory of B340A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B340A-13 is usually 5 days.
3.What payment methods are accepted for B340A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B340A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B340A-13?
B340A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B340A-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 B340A-13?
For technical support, including B340A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B340A-13 requirements.
6.How does Aetrix verify that B340A-13 is sourced from the original manufacturer or authorized distributors?
All B340A-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 B340A-13 meets industry standards.
7.What is the process for return or replacement of B340A-13?
All B340A-13 units undergo pre-shipment inspection (PSI). If there is an issue with B340A-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 B340A-13 part is unused and in its original packaging.
Return procedure for B340A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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