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Diodes Incorporated DFLS140-7
- Part No.:
- DFLS140-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLS140-7.pdf
- Description:
- DIODE SCHOTT 40V 1.1A PWRDI123
- Quantity:
- Payment:
- Shipping:
Inventory:14,880
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Product details
Overview
DFLS140-7 from Diodes Incorporated is a 1.0A surface-mount Schottky barrier rectifier in PowerDI123 package, rated for 40V peak repetitive reverse voltage, 1.1A average forward current at +119°C, and 40A non-repetitive surge current. It delivers low forward voltage drop (0.45V @ 0.5A), high efficiency, and transient protection via guard ring die construction - used in DC/DC converter output rectification, USB power delivery circuits, and portable battery charging systems.
For engineers reviewing the DFLS140-7 datasheet, DFLS140-7 pinout, DFLS140-7 application, or DFLS140-7 equivalent, key selection criteria include its 0.51V VF at 1.1A, 28pF junction capacitance at 10V, 10°C/W junction-to-soldering thermal resistance, RoHS-compliant matte tin finish, and automotive-grade variant availability (DFLS140Q).
Technical Context
This Schottky rectifier employs a guard ring die structure to suppress edge breakdown and improve transient robustness under fast-rising voltage stress. Its interlocking clip design enhances mechanical bond integrity and enables 40A IFSM capability without bond wire failure.
Thermal performance is defined by two distinct RθJA values: 60°C/W on a 50.8mm × 50.8mm GETEK board with optimized copper pad layout, and 180°C/W on standard FR-4 - confirming strong dependence on PCB thermal design for sustained 1.1A operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum allowable repetitive reverse voltage before avalanche conduction begins |
| IF(AV) | 1.1 A - Sustained DC forward current at terminal temperature of +119°C with proper heatsinking |
| VF @ 1.1A | 0.51 V - Forward voltage drop determining conduction loss in high-efficiency SMPS output stages |
| IFS M | 40 A - Peak surge current tolerance for 8.3ms half-sine waveform, critical for input capacitor inrush handling |
| CT @ 10V | 28 pF - Junction capacitance affecting high-frequency switching noise and EMI in buck converter freewheel paths |
| RθJS | 10 °C/W - Thermal resistance from die junction to solder joint, enabling direct thermal modeling to PCB copper |
Pinout & Package
Package: PowerDI123 - surface-mount, 3-pin, single-diode configuration with cathode band marking; molded green compound, UL 94V-0 rated, 0.01g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/high-side node in buck/flyback secondary; requires ≥1.8mm × 1.2mm copper pad per datasheet |
| Cathode | Forward current exit / reverse blocking terminal | Connected to output/ground return path; uses larger 1.8mm × 2.5mm pad for thermal dissipation |
| Cathode Tab | Thermal and electrical connection to cathode | Exposed metal tab on bottom side serves as primary heat path to PCB; must be soldered to solid copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses localized electric field crowding at die edges, improving reliability under repetitive reverse transient stress |
| Interlocking clip design | Increases mechanical adhesion between die and leadframe, preventing delamination during 40A surge events |
| Low VF at high IF | 0.51V @ 1.1A reduces conduction loss by ~35% vs. comparable 1A silicon rectifiers in 5V-output converters |
| RoHS & Halogen-free compliance | Meets EU RoHS 3 (2015/863/EU) and "Green" definition: Br+Cl <1500ppm, Sb <1000ppm |
Applications
| DC/DC Converter Output Rectification | USB Power Delivery (5V–20V) Circuits |
|---|---|
Use Scenario: Secondary-side rectification in synchronous or asynchronous buck converters delivering 1–3A at 3.3V/5V/12V. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during high-side switch off-time. Use Value: 0.51V VF minimizes power loss and thermal rise in compact power modules where airflow is limited. | Use Scenario: Input protection and reverse-polarity blocking in USB-C PD sink applications with variable 5–20V input rails. IC Role / Device Role / Timing Role: Unidirectional current gate preventing backfeed from downstream circuitry into upstream source. Use Value: 40V VRRM safely handles 20V PD profiles plus margin; 28pF CT avoids signal integrity degradation on CC lines. |
| Portable Battery Charging Systems | Industrial 24V Auxiliary Power Supplies |
Use Scenario: OR-ing diode in dual-input (USB + adapter) Li-ion charging paths for wearables and IoT sensors. IC Role / Device Role / Timing Role: Prevents cross-conduction and enables seamless source selection without control logic. Use Value: Low 0.45V VF @ 0.5A preserves battery runtime; cathode-tab thermal path sustains 1.1A continuous load in sealed enclosures. | Use Scenario: Input rectification in DIN-rail mounted 24V auxiliary supplies powering PLC I/O modules. IC Role / Device Role / Timing Role: AC-to-DC bridge leg component in compact linear or quasi-resonant topologies. Use Value: 40A IFSM withstands transformer inrush surges; -55°C to +125°C TJ range supports uncooled operation in industrial cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS14-E3/5AT (Vishay) | Same 40V VRRM, 1A IF(AV), but VF = 0.55V @ 1A; PowerDI123-compatible footprint | Slightly higher conduction loss; lower surge rating (30A IFSM) | Acceptable where 50mV VF penalty is tolerable and surge margin is not critical |
| MBR140T3G (ON Semiconductor) | 40V VRRM, 1A IF(AV), VF = 0.53V @ 1A; SOD-123 package (smaller, lower thermal mass) | Higher RθJA (~200°C/W); unsuitable for >0.7A continuous without derating | Only for space-constrained designs with light loads and no thermal cycling stress |
Compared with SS14-E3/5AT and MBR140T3G, DFLS140-7 provides superior thermal performance (10°C/W RθJS), higher surge capacity (40A), and tighter VF distribution - making it preferred for thermally demanding, high-reliability 1A rectification tasks.
Availability
DFLS140-7 is available at Aetrix Electronics and suitable for DC/DC converter output rectification, USB power delivery circuits, and portable battery charging systems requiring stable component supply across production lifecycles.
Supply support for DFLS140-7 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 North America.
The DFLS140 belongs to Diodes' Power Discrete product line, engineered specifically for high-efficiency, surface-mount rectification in space-constrained power conversion systems operating from -55°C to +125°C.
FAQ
What is the maximum continuous forward current for DFLS140-7 at +85°C ambient?
At +85°C ambient temperature on a standard FR-4 board, DFLS140-7 is rated for approximately 0.75A continuous forward current. This is derived from the derating curve (Figure 5), where IF(AV) drops linearly from 1.1A at +119°C terminal temperature to zero at +150°C - resulting in ~0.75A at TA = +85°C with typical PCB thermal resistance.
Does DFLS140-7 have a qualified automotive version?
Yes, the DFLS140Q is the AEC-Q101 qualified automotive variant of this device, manufactured with enhanced process controls and tested to automotive reliability standards. It shares identical electrical specifications and PowerDI123 packaging but includes additional qualification documentation and traceability for automotive Tier-1 applications.
Can DFLS140-7 replace a 1N5819 in existing designs?
DFLS140-7 can replace 1N5819 in surface-mount layouts using PowerDI123 footprints, offering lower VF (0.51V vs. 0.6V), higher IF(AV) (1.1A vs. 1.0A), and superior surge rating (40A vs. 25A). However, due to different package geometry and thermal path, PCB layout revision and thermal validation are required before drop-in substitution.
What is the significance of the "7" suffix in DFLS140-7?
The "-7" suffix denotes tape-and-reel packaging: 3,000 units per reel in EIA-481-compliant carrier tape. It does not indicate a revision level or parameter variant - all electrical and thermal specifications match the base DFLS140 part number as defined in DS30446 Rev. 9-2.
DFLS140-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- POWERDI®123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 1.1A
- Voltage - Forward (Vf) (Max) @ If:
- 530 mV @ 1.1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 20 µA @ 40 V
- Capacitance @ Vr, F:
- 28pF @ 10V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
- Operating Temperature - Junction:
- -55°C ~ 125°C
DFLS140-7 FAQ
1.How can I place an order for DFLS140-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLS140-7 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 DFLS140-7 reliable?
The price and inventory of DFLS140-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLS140-7 is usually 5 days.
3.What payment methods are accepted for DFLS140-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLS140-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLS140-7?
DFLS140-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLS140-7 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 DFLS140-7?
For technical support, including DFLS140-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLS140-7 requirements.
6.How does Aetrix verify that DFLS140-7 is sourced from the original manufacturer or authorized distributors?
All DFLS140-7 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 DFLS140-7 meets industry standards.
7.What is the process for return or replacement of DFLS140-7?
All DFLS140-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLS140-7, 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 DFLS140-7 part is unused and in its original packaging.
Return procedure for DFLS140-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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