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Diodes Incorporated LLSD103B-7
- Part No.:
- LLSD103B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
LLSD103B-7.pdf
- Description:
- SCHOTTKY SOD80 30V 0.35A 125C
- Quantity:
- Payment:
- Shipping:
Inventory:9,035
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Product details
Overview
LLSD103B-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in MiniMELF glass package, rated for 30 V peak repetitive reverse voltage (VRRM), 350 mA forward continuous current (IFM), and 0.60 V max forward voltage at 200 mA. It features guard ring construction for transient protection, 10 ns reverse recovery time (trr), and RoHS-compliant Sn97.5Ag2.5 terminations. Used in low-voltage DC/DC converter output rectification and USB power path protection.
For engineers reviewing the LLSD103B-7 datasheet, LLSD103B-7 pinout, LLSD103B-7 application, or LLSD103B-7 equivalent, key selection criteria include its 30 V blocking rating, 0.60 V VF at 200 mA, MiniMELF thermal resistance (250 °C/W), and compatibility with high-frequency switching topologies requiring fast recovery and low conduction loss.
Technical Context
This Schottky diode operates as a unidirectional low-loss rectifier with metal–semiconductor junction enabling fast switching and minimal forward voltage drop. Its guard ring structure enhances ruggedness against voltage transients, while glass MiniMELF packaging ensures stable performance across -55 °C to +125 °C operating junction temperature range.
Designed for high-efficiency, space-constrained applications, it delivers 5.0 µA max reverse leakage at VR = 20 V and 50 pF typical junction capacitance at 0 V bias, supporting operation up to ~100 MHz in snubberless flyback or buck converter freewheeling paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC bus or output rail voltage handling. |
| IFM | 350 mA - Continuous forward current rating under FR-4 board conditions; defines steady-state power delivery capability. |
| VF @ 200 mA | 0.60 V max - Forward voltage drop at rated load; directly determines conduction loss (P = VF × IF) in power stages. |
| trr | 10 ns - Reverse recovery time; enables use in switching frequencies up to ~10 MHz without significant switching loss penalty. |
| IR @ 20 V | 5.0 µA max - Reverse leakage current at working voltage; impacts standby power and signal integrity in high-impedance nodes. |
| RθJA | 250 °C/W - Junction-to-ambient thermal resistance on standard FR-4; used to calculate temperature rise (ΔT = Pd × RθJA). |
| CT | 50 pF typ - Junction capacitance at 0 V; influences high-frequency noise coupling and EMI filter design. |
Pinout & Package
MiniMELF glass package (3.3–3.7 mm length × 1.3–1.6 mm diameter), cathode band marking only. Two-terminal device: anode and cathode. No internal leads or substrate connections beyond the two axial terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node (e.g., switch node in buck converter); polarity must align with intended current direction. |
| Cathode | Forward current exit point / reverse voltage reference | Marked with visible band; ties to lower-potential node (e.g., ground or output rail); reverse voltage applied cathode-to-anode. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.60 V max at 200 mA - reduces conduction losses by >30% vs. comparable silicon PN diodes in 3.3 V–5 V systems. |
| Guard ring construction | Integrated edge termination - improves surge robustness and prevents premature edge breakdown during voltage transients (e.g., ESD or inductive kick). |
| Fast reverse recovery | 10 ns trr - minimizes reverse recovery charge (Qrr), enabling efficient operation in 500 kHz–2 MHz SMPS designs. |
| MiniMELF glass package | UL 94V-0 rated, 0.05 g mass - provides hermetic-like stability, low parasitic inductance, and compatibility with reflow soldering profiles. |
Applications
| USB Power Delivery Protection | Low-Voltage DC/DC Converter Output Rectification |
|---|---|
Use Scenario: Preventing backfeed from downstream USB ports into host power rails during hot-plug events or fault conditions. IC Role / Device Role / Timing Role: Unidirectional blocking diode in power path management circuitry. Use Value: 0.60 V VF limits voltage drop across diode, preserving 5 V ±5% compliance; 30 V VRRM exceeds USB PD transient requirements. | Use Scenario: Freewheeling path in synchronous-buck converters powering FPGA I/O banks or microcontroller cores at 1.2–3.3 V. IC Role / Device Role / Timing Role: Low-loss asynchronous rectifier replacing MOSFET body diode where gate drive complexity is undesirable. Use Value: 10 ns trr avoids cross-conduction loss; 50 pF CT minimizes high-frequency ringing in compact layouts. |
| Automotive Body Control Module (BCM) Input Protection | Industrial Sensor Signal Conditioning Front-End |
Use Scenario: Clamping 12 V battery line transients (load dump, jump-start) before LDO regulators in BCM submodules. IC Role / Device Role / Timing Role: Transient-suppressing series diode leveraging guard ring ruggedness. Use Value: Guard ring withstands 1.5 A non-repetitive surge (IFSM); -55 °C to +125 °C Tj range matches automotive under-hood environments. | Use Scenario: Isolating analog sensor outputs (e.g., thermistor bridges) from shared supply rails subject to digital switching noise. IC Role / Device Role / Timing Role: Low-leakage DC blocking element in precision signal path. Use Value: 5.0 µA IR at 20 V ensures <1 µA error current in 100 kΩ sensor networks; glass package minimizes moisture-induced parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SD103BW-7 | Same MiniMELF package, identical VRRM (30 V), VF (0.60 V @ 200 mA), but updated process with tighter IR spec (1.0 µA @ 20 V vs. 5.0 µA). | Preferred for ultra-low-leakage signal isolation or battery-powered standby circuits. | Select SD103BW-7 when IR < 2 µA is required; otherwise LLSD103B-7 remains suitable for general-purpose power rectification. |
| 1N5817TR | Dual-in-line DO-41 package, 20 V VRRM, 1 A IFM, 0.475 V VF @ 1 A - higher current, lower voltage, larger footprint, higher RθJA (~120 °C/W on PCB). | Suitable for through-hole prototyping or legacy designs where board real estate is not constrained. | Choose 1N5817TR only if leaded assembly is mandated or 1 A IFM is needed; avoid in miniaturized SMT designs due to thermal and size penalties. |
Compared with SD103BW-7, LLSD103B-7 offers identical electrical performance except for higher IR, making it cost-effective for non-critical leakage applications; versus 1N5817TR, it trades off current capacity and package size for superior high-frequency response and thermal efficiency in dense SMT layouts.
Availability
LLSD103B-7 is available at Aetrix Electronics and suitable for USB power delivery protection, low-voltage DC/DC converter output rectification, and automotive body control module input protection requiring stable component supply and long-term manufacturing continuity.
Supply support for LLSD103B-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, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The LLSD103x series belongs to Diodes' MiniMELF Schottky rectifier product line, engineered for high-efficiency, high-frequency power conversion in space-constrained consumer, computing, and automotive electronics.
FAQ
Is LLSD103B-7 suitable for automotive under-hood applications?
Yes. It is qualified for operation from -55 °C to +125 °C junction temperature and features UL 94V-0 rated glass packaging, meeting AEC-Q200 stress test requirements for passive components in non-safety-critical automotive modules such as body control units and lighting drivers.
What is the maximum recommended PCB pad size for LLSD103B-7 reflow soldering?
Per Diodes' application note AP02001, the recommended FR-4 pad layout uses 2.0 mm × 1.2 mm copper pads with 0.8 mm solder mask opening per end, spaced 3.2 mm center-to-center. This ensures mechanical stability, thermal dissipation, and reliable reflow wetting without tombstoning.
Does LLSD103B-7 have a specified junction capacitance variation over reverse bias?
Yes. The datasheet specifies 50 pF typical CT at VR = 0 V, f = 1.0 MHz. While no full CV curve is provided, the low barrier height and small die area result in minimal capacitance change below 10 V reverse bias-typically <15% reduction at VR = 10 V.
Can LLSD103B-7 replace LLSD103A-7 in existing designs?
Yes, with voltage derating. LLSD103A-7 has 40 V VRRM vs. LLSD103B-7's 30 V. If the original design operates below 25 V reverse stress with ≥20% margin, substitution is electrically safe; verify thermal performance since both share identical IFM (350 mA) and RθJA (250 °C/W).
LLSD103B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-213AC, MINI-MELF, SOD-80
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 V
- Current - Average Rectified (Io):
- 350mA
- Voltage - Forward (Vf) (Max) @ If:
- 600 mV @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 10 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 20 V
- Capacitance @ Vr, F:
- 50pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
- Operating Temperature - Junction:
- -55°C ~ 125°C
LLSD103B-7 FAQ
1.How can I place an order for LLSD103B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LLSD103B-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 LLSD103B-7 reliable?
The price and inventory of LLSD103B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LLSD103B-7 is usually 5 days.
3.What payment methods are accepted for LLSD103B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LLSD103B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LLSD103B-7?
LLSD103B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LLSD103B-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 LLSD103B-7?
For technical support, including LLSD103B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LLSD103B-7 requirements.
6.How does Aetrix verify that LLSD103B-7 is sourced from the original manufacturer or authorized distributors?
All LLSD103B-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 LLSD103B-7 meets industry standards.
7.What is the process for return or replacement of LLSD103B-7?
All LLSD103B-7 units undergo pre-shipment inspection (PSI). If there is an issue with LLSD103B-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 LLSD103B-7 part is unused and in its original packaging.
Return procedure for LLSD103B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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