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Diodes Incorporated B240S1FQ-7
- Part No.:
- B240S1FQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123F
- Datasheet:
-
B240S1FQ-7.pdf
- Description:
- SCHOTTKY RECTIFIER SOD123F T&R 3
- Quantity:
- Payment:
- Shipping:
Inventory:5,658
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Product details
Overview
B240S1FQ from Diodes Incorporated is a 2.0A, 40V Schottky barrier rectifier in SOD123F package, featuring 0.50V max forward voltage at 2A/25°C, 0.2mA max reverse leakage at 40V/25°C, and AEC-Q101 qualification for automotive use in boost, blocking, and recirculating diode circuits.
For engineers reviewing the B240S1FQ datasheet, B240S1FQ pinout, B240S1FQ application, or B240S1FQ equivalent, this device delivers verified low VF stability up to +125°C, high-temperature IR control, RoHS-compliant green packaging, and IATF 16949-manufactured traceability for mission-critical power conversion designs.
Technical Context
This Schottky rectifier uses a planar epitaxial construction with low-barrier metal-semiconductor junction to achieve minimal forward conduction loss and fast switching recovery. Its thermal resistance (RθJA = 100°C/W on FR-4) and junction-to-case (RθJC = 40°C/W) support sustained 2A DC operation within -55°C to +150°C ambient range.
The device exhibits 120pF typical junction capacitance at 4.0V/1MHz and maintains <0.02mA IR at 40V/25°C, rising to 12mA at 40V/125°C - enabling stable performance in high-frequency DC-DC converters and automotive body electronics where thermal runaway risk must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; defines safe blocking capability in 36V automotive systems. |
| IO | 2 A - Continuous average forward current rating; supports compact 2A rectification without heatsinking in SOD123F footprint. |
| VF (max) | 0.50 V @ 2A, 25°C - Low conduction loss enables >92% efficiency in 5V–12V buck-derived supplies. |
| IR (max) | 0.2 mA @ 40V, 25°C - Tight leakage spec ensures minimal standby power loss in always-on modules. |
| RθJA | 100 °C/W - Thermal resistance on standard FR-4 board; allows ~1.2W dissipation before reaching 150°C junction limit. |
| Junction Cap. | 120 pF @ 4V, 1MHz - Low capacitance minimizes switching noise and EMI in high-frequency SMPS outputs. |
Pinout & Package
Package: SOD123F - surface-mount, molded plastic case with matte tin annealed copper leadframe, UL 94V-0 rated, moisture sensitivity level 1, cathode band polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to source/low-side switch node; requires thermal pad layout per Diodes SOD123F footprint (E = 2.70mm, He = 3.50mm). |
| Cathode | Forward current exit / reverse voltage blocking terminal | Marked by cathode band; ties to output rail or ground return; critical for reverse-bias integrity in boost topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF (0.40–0.50V) | Reduces conduction loss by ≥35% vs. standard PN rectifiers, lowering thermal stress in space-constrained PCBs. |
| High-temp IR stability | Leakage remains ≤12mA at 125°C/40V - prevents thermal runaway in under-hood automotive modules. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and ESD testing per IATF 16949 process controls. |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); meets EU RoHS 3 and automotive ELV directives. |
Applications
| Automotive Body Control Module | USB-C Power Delivery Adapter |
|---|---|
Use Scenario: Reverse polarity protection and load dump clamping in 12V BCM power rails. IC Role / Device Role / Timing Role: Blocking diode preventing battery backfeed during alternator transients. Use Value: 40V VRRM withstands ISO 7637-2 pulse 5a (±100V), while 0.5V VF limits insertion loss to <1.0W at 2A. |
Use Scenario: Output rectification in 20W–30W GaN-based USB-PD flyback converters. IC Role / Device Role / Timing Role: Synchronous rectifier replacement with zero-recovery delay. Use Value: 120pF junction capacitance reduces switching node ringing; 2A IO sustains full-load output without derating. |
| Industrial PLC I/O Module | LED Driver Power Supply |
Use Scenario: Flyback snubber and recirculation path for 24V solenoid driver outputs. IC Role / Device Role / Timing Role: Freewheeling diode across inductive loads during PWM turn-off. Use Value: Fast recovery eliminates voltage spikes >60V; 150°C TJ rating supports operation in sealed enclosures. |
Use Scenario: Secondary-side rectification in constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: Main output rectifier delivering 1.5A–2.0A to LED string. Use Value: 0.2mA IR at 25°C ensures <10μW standby loss; green compound complies with outdoor lighting environmental specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB240-E3/54 (Vishay) | Same 40V/2A rating but SOD-123 (not SOD123F); RθJA = 120°C/W; VF = 0.55V max @ 2A. | Larger thermal pad clearance required; higher VF increases conduction loss by ~110mW at 2A. | Acceptable for non-automotive industrial use where AEC-Q101 and tighter thermal resistance are not mandated. |
| SS24 (ON Semiconductor) | SOD-123 package; VF = 0.55V max @ 2A; no AEC-Q101 certification; IR = 0.5mA @ 40V/25°C. | Higher leakage degrades efficiency in always-on applications; lacks PPAP documentation for Tier 1 automotive sourcing. | Suitable for cost-sensitive consumer adapters where thermal margin and automotive compliance are secondary. |
Compared with SB240-E3/54 and SS24, the B240S1FQ provides superior thermal performance (100°C/W vs. ≥120°C/W), lower leakage (0.2mA vs. ≥0.5mA), and full automotive qualification - making it the preferred choice for thermally constrained, safety-critical, or production-bound designs.
Availability
B240S1FQ is available at Aetrix Electronics and suitable for automotive body electronics, USB-C PD adapters, industrial PLC I/O modules, and LED driver power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for B240S1FQ 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The B240S1FQ belongs to Diodes' automotive-qualified Schottky rectifier product line, engineered specifically for high-reliability 12V/24V power conversion in under-hood and interior vehicle systems.
FAQ
Is B240S1FQ suitable for synchronous rectification in DC-DC converters?
No - the B240S1FQ is a passive Schottky rectifier, not a synchronous rectifier IC. It replaces MOSFETs in low-voltage, medium-current flyback or buck outputs where gate drive complexity must be avoided. Its 120pF capacitance and 0.5V VF make it appropriate for <500kHz operation, but it cannot be actively controlled like a synchronous FET driver.
What is the maximum allowable PCB copper pad size for thermal relief in SOD123F mounting?
Per Diodes' recommended layout, the cathode pad should be 2.70mm × 3.50mm (E × He) with minimum 0.3mm solder mask opening. Increasing pad area beyond 4.0mm² improves RθJA marginally but risks solder bridging; thermal vias are not recommended due to SOD123F's single-sided thermal path design.
Does B240S1FQ require derating when used in sealed enclosures?
Yes - at 70°C ambient, its IO derates to 1.6A (per Figure 4). In sealed enclosures without airflow, junction temperature rise exceeds 100°C/W; for continuous 2A operation, forced convection or external heatsinking is required above 50°C ambient.
Can B240S1FQ replace B240A in existing designs?
Yes, with verification - both are 40V/2A Schottky rectifiers, but B240S1FQ uses SOD123F (smaller footprint, lower RθJA) versus B240A's DO-214AC (SMA). Mechanical fit requires pad redesign; electrical behavior is nearly identical, though B240S1FQ offers tighter IR control and AEC-Q101 qualification.
B240S1FQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 2A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 120pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
- Operating Temperature - Junction:
- -55°C ~ 150°C
B240S1FQ-7 FAQ
1.How can I place an order for B240S1FQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B240S1FQ-7 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 B240S1FQ-7 reliable?
The price and inventory of B240S1FQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B240S1FQ-7 is usually 5 days.
3.What payment methods are accepted for B240S1FQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B240S1FQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B240S1FQ-7?
B240S1FQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B240S1FQ-7 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 B240S1FQ-7?
For technical support, including B240S1FQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B240S1FQ-7 requirements.
6.How does Aetrix verify that B240S1FQ-7 is sourced from the original manufacturer or authorized distributors?
All B240S1FQ-7 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 B240S1FQ-7 meets industry standards.
7.What is the process for return or replacement of B240S1FQ-7?
All B240S1FQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with B240S1FQ-7, 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 B240S1FQ-7 part is unused and in its original packaging.
Return procedure for B240S1FQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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