B240A-13-F - 40V 2A Schottky Rectifier, SMA | Diodes Incorporated
料号： B240A-13-F ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.16 | $0.16 |
| 10 | $0.13 | $1.30 |
| 100 | $0.09 | $9.00 |
| 500 | $0.072 | $36.00 |
| 1,000 | $0.058 | $58.00 |
| 5,000 | $0.044 | $220.00 |
B240A-13-F 概述
A Schottky barrier rectifier is a unipolar diode formed by a metal-semiconductor junction rather than a P-N junction, which eliminates the minority-carrier recombination delay and produces a forward voltage drop roughly half that of a silicon rectifier. Within the broader component taxonomy, it sits under discrete semiconductor > diode > rectifier > Schottky rectifier > surface-mount Schottky. This technology is most useful in switching power supplies, where the absence of reverse-recovery charge minimizes switching loss and EMI.
Key specifications of the B240A-13-F include a 40 V repetitive peak reverse voltage (VRRM), 2 A average rectified forward current (IF(AV)), a low forward voltage typically around 0.45 V at 2 A, and a peak forward surge current of 50 A (8.3 ms single half-sine-wave). It is rated for operation from -65C to +150C (TJ) and is supplied on tape-and-reel in 5,000-piece reels, making it suitable for automated assembly lines. The device is lead-free, RoHS compliant, and reaches MSL Level 1 per JEDEC J-STD-020.
The guard-ring die construction around the active junction suppresses avalanche breakdown at the edge of the Schottky barrier, improving transient robustness. Combined with the inherently low stored charge of the Schottky technology, the B240A-13-F delivers fast switching transitions, which reduces dead-time losses in synchronous-rectified buck converters and improves the efficiency of freewheeling paths in motor drive circuits.
Typical applications for the B240A-13-F include low-voltage AC-to-DC bridge rectification, freewheeling diodes for 12 V buck and boost converters, reverse-polarity protection on USB and automotive harnesses, and OR-ing diodes in redundant power-supply rails. The combination of a 2 A continuous rating with a 40 V reverse voltage comfortably covers 12 V and 24 V bus rails with ample transient margin.
When designing with this part, ensure that the SMA land pattern adheres to DO-214AC dimensions and that the thermal pad is soldered to a copper pour sized for the expected dissipation. The 0.45 V forward drop at full load represents the dominant conduction loss; for applications with continuous 2 A operation, an active cooling path or PCB heatsinking is recommended.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single source for selecting, sourcing, and second-sourcing the B240A-13-F in production designs.
直接替换替代料： B240A-13-F ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
B240AQ-13-F
✅ 直接替换📋 参考替代料（不在目录中）
B240A-13
✅ 直接替换📋 参考替代料（不在目录中）
B240A-13-F
✅ 直接替换✓ 有现货
$0.044 / 个
查看数据手册 →B240A-E3/61T
✅ 直接替换📋 参考替代料（不在目录中）
NRVBA240T3G
✅ 直接替换📋 参考替代料（不在目录中）
MBRA240LT3G
✅ 直接替换📋 参考替代料（不在目录中）
B240A-13-F 最大额定值与电气特性
| Manufacturer | Diodes Incorporated |
| Product Type | Schottky Barrier Rectifier |
| 封装 | SMA (DO-214AC) |
| 安装类型 | Surface Mount |
| 引脚数 | 2 |
| Configuration | Single |
| Repetitive Peak Reverse Voltage (VRRM) | 40 V |
| Average Rectified Forward Current (IF(AV)) | 2 A |
| Peak Forward Surge Current (IFSM) | 50 A (8.3 ms single half-sine) |
| Forward Voltage (VF) typ @ IF=2A | 0.45 V |
| Reverse Leakage Current (IR) @ VRRM | 0.5 mA (typ) |
| 工作结温范围 | -65C to +150C |
| Storage Temperature Range | -65C to +150C |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
| Packaging | Tape & Reel, 5000 pcs/reel |
B240A-13-F 引脚配置
| 引脚 1 | Anode (A) — Anode terminal of the Schottky rectifier |
| 引脚 2 | Cathode (K) — Cathode terminal of the Schottky rectifier (marked with cathode band) |
典型应用
B240A-13-F 适用于 6 应用s: Low-Voltage AC-DC Bridge Rectifier, Buck Converter Freewheeling Diode, Reverse-Polarity Protection, OR-ing Diode for Redundant Power, Automotive 12V/24V Bus Rectifier, Solar Panel Blocking Diode.
Low-Voltage AC-DC Bridge Rectifier
The B240A-13-F serves as the high-frequency rectifier element in low-voltage AC-to-DC converters where its 40 V reverse rating and 2 A forward current comfortably cover 12 V and 24 V secondary rails. The 0.45 V typical forward drop at 2 A reduces conduction loss by roughly 55% compared to a standard silicon rectifier, which directly improves overall converter efficiency. Designers typically place two or four B240A-13-Fs in a full-wave bridge configuration, with the SMA land pattern accommodating automated pick-and-place assembly. The Schottky technology eliminates reverse-recovery charge, which minimizes switching loss and EMI in the rectifier stage.
推荐
Buck Converter Freewheeling Diode
In buck and buck-boost switching regulators, the B240A-13-F acts as the low-side freewheeling diode that conducts inductor current during the switch off-time. Its near-zero reverse-recovery charge eliminates the dead-time losses and ringing typical of silicon P-N diodes, which lets the regulator operate at higher switching frequencies (often 500 kHz to 1 MHz) without significant efficiency penalty. The 40 V VRRM gives designers strong transient margin above the 24 V maximum input rail. At 2 A average current with a 12 V input and 5 V output, conduction loss is dominated by the 0.45 V forward drop, equivalent to ~9% duty-cycle loss that improves overall efficiency.
推荐
Reverse-Polarity Protection
The B240A-13-F is widely used as a series reverse-polarity protection diode between an external DC input (USB, automotive harness, battery terminal) and the downstream load. Its 40 V reverse standoff and 2 A forward rating comfortably handle 12 V and 24 V systems with transient headroom. The 0.45 V forward drop is the main trade-off versus a P-MOSFET ideal-diode solution; for 2 A loads this represents a 0.9 W dissipation that must be sunk through the SMA thermal pad. Compared to a silicon rectifier (~1.0 V drop), the Schottky version saves roughly 1.1 W at 2 A, which is often the difference between needing and not needing a heatsink.
推荐
OR-ing Diode for Redundant Power
In redundant power-supply rails where two sources feed a common load, the B240A-13-F serves as the OR-ing diode that prevents reverse current flow when one source drops out. Its 2 A rating suits low-power subsystems such as sensor rails, auxiliary logic supplies, and fan controllers. The Schottky construction has negligible reverse-recovery, which avoids cross-conduction spikes during source hand-off. For higher-current OR-ing, designers typically switch to P-MOSFET ideal-diode controllers; for 2 A and below, the B240A-13-F remains the most cost-effective discrete solution.
推荐
Automotive 12V/24V Bus Rectifier
The B240A-13-F is widely used in 12 V and 24 V automotive subsystems such as interior lighting drivers, infotainment rails, and body-control modules where 2 A rectification is sufficient. Its 40 V VRRM provides a 1.7x transient safety margin above the 24 V nominal rail during load-dump events. The SMA package withstands the thermal-cycling demands of under-hood-adjacent environments and the -40C to +125C operating range covers most passenger-compartment designs. For AEC-Q101 qualified designs, the B240AQ-13-F is the pin-compatible automotive drop-in part sharing the same die.
推荐
Solar Panel Blocking Diode
In small off-grid solar installations, the B240A-13-F is used as a blocking diode in series with each panel string to prevent reverse current flow from the battery bank into the panels at night or during low-irradiance conditions. Its 40 V reverse standoff supports up to three 12 V panels in series (36 V nominal), and the 2 A forward rating handles charging currents up to 2 A per string. The Schottky construction reduces voltage drop compared to silicon rectifiers, recovering roughly 1-2% of daily energy yield in low-voltage systems. The SMA package is IP-rated when conformal-coated for outdoor installations.
推荐
推荐产品汇总
工程参考数据： B240A-13-F ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | B240AQ-13-F | B240A-E3/61T | NRVBA240T3G | MBRA240LT3G |
|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Vishay Intertechnology | onsemi | onsemi |
| Package | SMA (DO-214AC) | SMA (DO-214AC) - same | SMA (DO-214AC) - same | SMA (DO-214AC) - same | SMA (DO-214AC) - same |
| VRRM (V) | 40 V | 40 V | 40 V | 40 V | 40 V |
| IF(AV) (A) | 2 A | 2 A | 2 A | 2 A | 2 A |
| VF typ @ 2A (V) | 0.45 V | 0.45 V | 0.50 V | 0.50 V | 0.45 V |
| AEC-Q101 Automotive | No | Yes | No | Yes | No |
| RoHS / Lead-Free | Yes | Yes | Yes | Yes | Yes |
关键差异点
- AEC-Q101 automotive-qualified variant available in same footprint （对比 B240A-13-F (commercial) vs B240AQ-13-F (AEC-Q101))
- Industry-standard 0.45 V typical forward voltage at 2 A （对比 B240A-13-F vs B240A-E3/61T (Vishay))
- Lower reverse-leakage current at high temperature （对比 B240A-13-F vs NRVBA240T3G (onsemi))
设计说明
At continuous 2 A forward current with a 0.45 V drop, the B240A-13-F dissipates approximately 0.9 W. The SMA package has a junction-to-ambient thermal resistance of approximately 80 C/W on a minimum land-pad PCB, resulting in a 72C junction temperature rise above ambient. For continuous full-load operation, solder the cathode pad to at least 100 mm^2 of copper pour to keep Tj below 125C at 50C ambient; otherwise derate to 1.5 A or add forced airflow.
Use the standard DO-214AC (SMA) land pattern with the cathode pad connected to a copper pour that doubles as both electrical conductor and thermal spreader. The land pattern dimensions per the IPC-7351 nominal SMA footprint provide adequate solder fillet formation; reducing the cathode pad below 100 mm^2 of copper will degrade thermal performance and risk solder-joint fatigue under thermal cycling.
Do not confuse the B240A-13-F (SMA package) with the B240-13-F (SMB package) - the SMB version has a larger footprint and is NOT pin-compatible on a DO-214AC land pattern. Always verify the cathode-band polarity against the schematic before soldering, as reversed installation destroys the diode and may damage upstream components. For 24 V buses with significant load-dump transients, derate to 30 V VRRM parts or add a TVS clamp upstream.
合规信息
AEC-Q100 is not applicable - this is a discrete rectifier. For AEC-Q101 automotive qualification, see the B240AQ-13-F drop-in alternative. RoHS and REACH compliant per Diodes Incorporated product page.
