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Diodes Incorporated LLSD103A-7
- Part No.:
- LLSD103A-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
LLSD103A-7.pdf
- Description:
- SCHOTTKY SOD80 40V 0.35A 125C
- Quantity:
- Payment:
- Shipping:
Inventory:5,935
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Product details
Overview
LLSD103A-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in MiniMELF glass package, rated for 40 V peak repetitive reverse voltage, 350 mA forward continuous current, and 0.60 V max forward voltage at 200 mA. It delivers fast 10 ns reverse recovery time and low 50 pF junction capacitance, enabling use in high-frequency DC-DC converter output rectification.
For engineers reviewing the LLSD103A-7 datasheet, LLSD103A-7 pinout, LLSD103A-7 application, or LLSD103A-7 equivalent, key selection criteria include its low VF trade-off against moderate VRRM, MiniMELF thermal performance under pulsed load, and cathode-band polarity marking for automated placement verification.
Technical Context
This Schottky diode employs guard ring construction to enhance transient voltage immunity without compromising switching speed. Its low RJA of 250 °C/W (on FR-4 with recommended pad layout) supports sustained 350 mA operation within -55 °C to +125 °C junction temperature range.
The device exhibits nonlinear forward conduction with VF = 0.37 V typical at 20 mA and 0.60 V max at 200 mA, while maintaining IR ≤ 5.0 µA at VR = 30 V - critical for low-leakage hold-up circuits in power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - maximum repetitive reverse voltage before breakdown; sets upper limit for flyback or clamp circuit design |
| IFM | 350 mA - continuous forward current rating on FR-4 board; defines steady-state power stage output capability |
| VF @ 200 mA | 0.60 V max - low conduction loss enables >92% efficiency in 3.3 V–5 V synchronous rectifier replacement |
| trr | 10 ns - fast recovery minimizes switching losses in 1–3 MHz DC-DC converters |
| CT | 50 pF @ 0 V - low junction capacitance reduces high-frequency noise coupling in EMI-sensitive layouts |
| RJA | 250 °C/W - thermal resistance determines required PCB copper area for thermal management |
Pinout & Package
MiniMELF glass package (3.3–3.7 mm length × 1.3–1.6 mm diameter), axial lead configuration with cathode band marking. No discrete pins; terminals are solderable axial leads per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to higher potential node (e.g., switch node in buck converter) |
| Cathode (band-marked end) | Forward current exit / reverse blocking terminal | Connected to output rail; band enables automated optical inspection alignment |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.37 V typical at 20 mA - reduces conduction loss in low-voltage, high-current paths |
| Guard ring construction | Enhances ESD and surge immunity without adding series resistance or slowing recovery |
| Fast reverse recovery | 10 ns trr - enables stable operation up to 3 MHz switching frequency in SMPS |
| MiniMELF glass package | 0.05 g mass and hermetic seal - supports reflow compatibility and long-term reliability in humid environments |
Applications
| AC-DC Adapter Output Rectification | USB Power Delivery Clamp Circuit |
|---|---|
Use Scenario: Secondary-side rectification in 5–12 V offline adapters with <100 kHz switching. IC Role / Device Role / Timing Role: Unidirectional current path with minimal VF-induced voltage droop during continuous conduction mode. Use Value: 0.60 V max VF ensures ≥4.7 V output under 350 mA load, meeting USB BC1.2 voltage regulation spec. | Use Scenario: Reverse-polarity protection and transient clamping on 5 V/3 A USB PD input rails. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt clamp activated during ESD events or hot-plug overshoot. Use Value: Guard ring structure withstands IEC 61000-4-2 Level 4 (8 kV contact) without parameter shift. |
| Automotive Body Control Module (BCM) LDO Bypass | Industrial Sensor Signal Conditioning |
Use Scenario: Reverse current blocking across 3.3 V LDO outputs feeding CAN transceivers in 12 V vehicle systems. IC Role / Device Role / Timing Role: Prevents backfeed during battery disconnect or load dump transients. Use Value: 40 V VRRM exceeds ISO 7637-2 Pulse 5a (75 V/100 ms) requirement with margin. | Use Scenario: Precision signal path isolation in 24-bit delta-sigma ADC front-ends operating at ±2.5 V. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA @ 30 V) DC blocking element between sensor and amplifier stages. Use Value: IR specification ensures <0.1 LSB error contribution at full-scale input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB130-E3/54 (Vishay) | Higher IFM (1.0 A), larger DO-41 package, VF = 0.5 V @ 300 mA | Requires larger PCB footprint; better suited for >500 mA average loads | Select when thermal budget allows larger package and higher current is needed |
| NSR0330HT1G (ON Semiconductor) | SOD-323 package, lower IFM (300 mA), VF = 0.45 V @ 100 mA | Smaller size but lower surge rating (IFSM = 4 A vs. 7.5 A); not rated for 30 V VR | Prefer for space-constrained 3.3 V logic rails where 20 V blocking suffices |
Compared with SB130-E3/54 and NSR0330HT1G, LLSD103A-7 uniquely balances MiniMELF reliability, 40 V blocking, and sub-0.6 V VF at 200 mA - making it optimal for compact, thermally constrained 5 V power rails requiring robust transient handling.
Availability
LLSD103A-7 is available at Aetrix Electronics and suitable for AC-DC adapters, USB PD interface protection, automotive BCM power domains, and industrial sensor signal chains requiring stable component supply across extended temperature ranges.
Supply support for LLSD103A-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 and manufacturing operations across Asia and the Americas.
The LLSD series belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for space-constrained, high-efficiency power conversion in consumer, computing, and automotive applications.
FAQ
What is the maximum allowable junction temperature for LLSD103A-7 during continuous operation?
The absolute maximum junction temperature is +125 °C. Sustained operation at this limit requires derating IFM based on ambient temperature and PCB thermal design - e.g., at TA = 85 °C, maximum continuous current drops to ~220 mA using the derating curve in Figure 3 of DS30068.
Does LLSD103A-7 meet JEDEC J-STD-020 moisture sensitivity level (MSL) requirements?
Yes - as a glass MiniMELF device with hermetically sealed construction, LLSD103A-7 is exempt from MSL classification per J-STD-020. It does not require dry pack or floor life controls prior to reflow soldering.
Can LLSD103A-7 be used in place of a standard silicon PN diode in a 12 V automotive circuit?
Yes, provided reverse voltage stays below 40 V and transient conditions align with its guard ring rating. Its lower VF reduces power loss by ~40% versus a 1N4007, but note its lower IR tolerance - leakage may exceed 5 µA above 85 °C, unlike silicon diodes.
Is the cathode band orientation standardized for automated optical inspection (AOI) setup?
Yes - the single black cathode band is positioned within 0.2 mm of one end of the MiniMELF body, conforming to IPC-A-610 Class 2 placement verification standards. AOI algorithms can reliably detect band position relative to centroid for polarity confirmation.
LLSD103A-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):
- 40 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 @ 30 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
LLSD103A-7 FAQ
1.How can I place an order for LLSD103A-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LLSD103A-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 LLSD103A-7 reliable?
The price and inventory of LLSD103A-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LLSD103A-7 is usually 5 days.
3.What payment methods are accepted for LLSD103A-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LLSD103A-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LLSD103A-7?
LLSD103A-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LLSD103A-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 LLSD103A-7?
For technical support, including LLSD103A-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LLSD103A-7 requirements.
6.How does Aetrix verify that LLSD103A-7 is sourced from the original manufacturer or authorized distributors?
All LLSD103A-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 LLSD103A-7 meets industry standards.
7.What is the process for return or replacement of LLSD103A-7?
All LLSD103A-7 units undergo pre-shipment inspection (PSI). If there is an issue with LLSD103A-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 LLSD103A-7 part is unused and in its original packaging.
Return procedure for LLSD103A-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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