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Diodes Incorporated DFLS120LQ-7
- Part No.:
- DFLS120LQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLS120LQ-7.pdf
- Description:
- DIODE SCHOTTKY 20V 1A PWRDI123
- Quantity:
- Payment:
- Shipping:
Inventory:53,307
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Product details
Overview
DFLS120LQ-7 from Diodes Incorporated is a 1.0A, 20V surface-mount Schottky barrier rectifier in PowerDI123 package, featuring 0.36V max forward voltage at 1.0A, 1.0mA max reverse leakage at 20V, and AEC-Q101 qualification for automotive polarity protection and flyback diode applications.
For engineers reviewing the DFLS120LQ-7 datasheet, DFLS120LQ-7 pinout, DFLS120LQ-7 application, or DFLS120LQ-7 equivalent, key selection criteria include low VF for thermal efficiency, 50A surge rating for load dump resilience, RoHS/Green compliance, and IATF 16949 manufacturing traceability.
Technical Context
This Schottky rectifier uses guard ring die construction to suppress transient-induced avalanche failure and patented interlocking clip design to sustain 50A non-repetitive surge current under 8.3ms half-sine wave conditions. Its low 0.36V VF at 1.0A directly reduces conduction loss in 12V automotive power rails.
Thermal performance is defined by two RθJA values: 60°C/W on optimized GETEK board (25% anode/75% cathode copper) and 180°C/W on standard FR-4, enabling accurate junction temperature prediction across PCB stack-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage; defines safe blocking capability in 12V automotive systems with load dump transients. |
| IF(AV) | 1.0 A - Average forward current rating; supports continuous operation in low-power DC/DC bias rails and sensor supply paths. |
| VF @ 1.0A | 0.36 V - Max forward voltage drop; limits power dissipation to ≤360mW at full load, reducing thermal stress on compact PCBs. |
| IR @ 20V | 1.0 mA - Max reverse leakage; ensures minimal standby current drain in always-on vehicle modules (e.g., CAN wake-up circuits). |
| IFSM | 50 A - Non-repetitive peak surge current; withstands ISO 7637-2 Pulse 5a load dump events without failure. |
| RθJA (GETEK) | 60 °C/W - Junction-to-ambient thermal resistance on high-copper test board; enables ~1.1W usable power handling before TJ exceeds 125°C. |
Pinout & Package
Package: PowerDI123 - Surface-mount, 3-pin (anode–cathode–cathode) molded plastic package with matte tin–annealed copper leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input | Single terminal; connects to positive rail or switch node; requires adequate copper pour for thermal relief. |
| Cathode (x2) | Forward current output / heat path | Dual cathode terminals share current and provide parallel thermal conduction paths to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge breakdown during voltage transients, improving reliability in automotive ESD and load dump environments. |
| Interlocking clip design | Enables 50A IFSM by distributing mechanical stress and enhancing bond wire current sharing under surge conditions. |
| Low VF (0.36V @ 1A) | Reduces conduction loss by >40% vs. comparable silicon rectifiers, lowering thermal design margin requirements. |
| AEC-Q101 qualification | Validated for automotive use with PPAP documentation support and IATF 16949 certified manufacturing. |
Applications
| Battery Polarity Protection | Flyback Diode in DC/DC Converters |
|---|---|
Use Scenario: Installed in series with vehicle battery input to prevent damage from reverse battery connection during service. IC Role / Device Role / Timing Role: Unidirectional current gate; blocks reverse current while conducting forward current with minimal voltage drop. Use Value: 0.36V VF limits power loss to 360mW at 1A, avoiding thermal shutdown in confined fuse box enclosures. | Use Scenario: Used as secondary-side freewheeling diode in 5V/1A buck converter powering infotainment USB ports. IC Role / Device Role / Timing Role: Energy recirculation path during MOSFET off-time; clamps inductive kickback and sustains output current continuity. Use Value: 50A IFSM rating handles peak currents during startup or short-circuit recovery without degradation. |
| Automotive Sensor Supply Rail | Start-Stop System Voltage Clamp |
Use Scenario: Provides reverse-biased protection on 3.3V supply lines feeding radar or camera modules. IC Role / Device Role / Timing Role: Standby leakage limiter; blocks backfeed from downstream capacitors during system sleep mode. Use Value: 1.0mA IR max at 20V ensures <3.3µA leakage into 3.3V rail, preserving ultra-low sleep current budgets. | Use Scenario: Clamps regenerated energy during engine restart in 12V start-stop systems. IC Role / Device Role / Timing Role: Transient energy sink; absorbs inductive spikes from alternator field coil collapse. Use Value: Guard ring structure prevents localized avalanche failure during repeated 100V+ transients per ignition cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB120-TB | Same 20V/1A rating but TO-277 package; higher RθJA (100°C/W), no AEC-Q101 qualification. | Limited to industrial or consumer-grade designs without automotive qualification requirements. | Select when cost is prioritized over automotive compliance and thermal performance is less constrained. |
| SS12A-13-F | 1.0A/20V in SMA package; VF = 0.45V @ 1A; 30A IFSM; RoHS-compliant but not AEC-Q101 qualified. | Suitable for non-automotive embedded power supplies where surge margin and thermal density are lower priority. | Choose for space-constrained non-automotive boards where PowerDI123 footprint is unavailable. |
Compared with SB120-TB and SS12A-13-F, DFLS120LQ-7 uniquely delivers AEC-Q101 qualification, 50A surge capability, and 0.36V VF in the thermally efficient PowerDI123 package-making it the only option qualified for safety-critical automotive polarity protection and flyback roles.
Availability
DFLS120LQ-7 is available at Aetrix Electronics and suitable for automotive battery management, infotainment power supplies, and ADAS sensor modules requiring stable component supply with full AEC-Q101 traceability and PPAP documentation.
Supply support for DFLS120LQ-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 DFLS120LQ belongs to Diodes' Automotive-Grade Schottky Rectifier product line, engineered specifically for AEC-Q101 compliance, high-surge resilience, and low-VF operation in 12V vehicle electrical systems.
FAQ
Is DFLS120LQ-7 suitable for 24V truck applications?
No. With a 20V VRRM rating, DFLS120LQ-7 is designed for 12V automotive systems only. It lacks sufficient margin for 24V nominal systems where load dump transients exceed 30V. For 24V applications, Diodes offers the DFLS220LQ (200V VRRM) or similar higher-voltage SBR® devices.
What is the cathode marking convention on the PowerDI123 package?
The cathode is marked by a visible band on the top surface of the PowerDI123 package, aligned with the dual cathode terminals on the bottom side. Per Diodes' marking specification F02, the band corresponds to the cathode side, and both cathode pins must be soldered to the same net-typically system ground or return path-for proper thermal and electrical performance.
Does DFLS120LQ-7 require derating at elevated ambient temperatures?
Yes. At TA > +25°C, IF(AV) must be linearly derated using the 60°C/W RθJA value. For example, at TA = +85°C, maximum allowable IF(AV) = 1.0A × (125°C − 85°C) / (125°C − 25°C) = 0.4A. Derating curves are provided in Figure 1 of DS37059 Rev. 2–2.
Can DFLS120LQ-7 replace a standard silicon rectifier in an existing design?
Yes-if the circuit operates below 20V reverse voltage and benefits from lower VF. However, Schottky devices exhibit higher reverse leakage than silicon rectifiers, especially at elevated temperatures. Verify that IR does not compromise standby current in always-on functions (e.g., CAN bus wake-up) before substitution.
DFLS120LQ-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):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 360 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 20 V
- Capacitance @ Vr, F:
- 75pF @ 10V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
- Operating Temperature - Junction:
- -55°C ~ 125°C
DFLS120LQ-7 FAQ
1.How can I place an order for DFLS120LQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLS120LQ-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 DFLS120LQ-7 reliable?
The price and inventory of DFLS120LQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLS120LQ-7 is usually 5 days.
3.What payment methods are accepted for DFLS120LQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLS120LQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLS120LQ-7?
DFLS120LQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLS120LQ-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 DFLS120LQ-7?
For technical support, including DFLS120LQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLS120LQ-7 requirements.
6.How does Aetrix verify that DFLS120LQ-7 is sourced from the original manufacturer or authorized distributors?
All DFLS120LQ-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 DFLS120LQ-7 meets industry standards.
7.What is the process for return or replacement of DFLS120LQ-7?
All DFLS120LQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLS120LQ-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 DFLS120LQ-7 part is unused and in its original packaging.
Return procedure for DFLS120LQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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