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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated LLSD103C-7

Name: LLSD103C-7
Brand: Diodes Incorporated
SKU: LLSD103C-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LLSD103C-7

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: LLSD103C-7.pdf

Description:: SCHOTTKY SOD80 20V 0.35A 125C

Quantity:: RFQ Add To RFQ list

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Inventory:9,374

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Product details

Overview

LLSD103C-7 from Diodes Incorporated is a surface-mount Schottky barrier diode in MiniMELF glass package, rated for 20 V DC blocking voltage, 350 mA continuous forward 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 LLSD103C-7 datasheet, LLSD103C-7 pinout, LLSD103C-7 application, or LLSD103C-7 equivalent, key selection criteria include its 20 V V_R, 350 mA I_F, 0.60 V V_F @ 200 mA, 10 ns t_rr, and MiniMELF mechanical compatibility with high-density PCB layouts.

Technical Context

This Schottky diode uses guard ring construction to enhance transient voltage immunity and suppress leakage under surge conditions. Its low forward voltage drop stems from a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction optimized for efficiency in low-voltage power rails.

The device operates across –55 °C to +125 °C junction temperature and exhibits derated blocking capability above 25 °C ambient-e.g., ~14 V VR at +100 °C per Fig. 3. Thermal resistance of 250 °C/W (junction-to-ambient, FR-4 board) defines its power handling under natural convection.

Key Specifications

Parameter	Value and Actual Design Meaning
V_R (DC Blocking)	20 V - Maximum steady-state reverse bias before breakdown; sets usable input/output voltage range in buck converters.
I_F (Continuous)	350 mA - Sustained forward current without thermal runaway on FR-4 with recommended pad layout.
V_F @ 200 mA	0.60 V max - Directly reduces conduction loss and heat generation in 3.3 V or 5 V output stages.
t_rr	10 ns - Enables operation up to ~35 MHz switching frequency before reverse recovery losses dominate.
C_T @ 0 V	50 pF - Limits high-frequency displacement current and EMI in fast-switching nodes.
R_JA	250 °C/W - Defines thermal rise per watt dissipated; requires ≤160 mW power budget for 40 °C rise on standard FR-4.

Pinout & Package

MiniMELF glass package (3.3–3.7 mm length × 1.3–1.6 mm diameter), cathode identified by single black band. Terminals are axial, solderable per MIL-STD-202, Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connects to higher-potential node (e.g., switch node in synchronous buck); polarity-sensitive for rectification.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connects to output rail or ground return; band orientation must match PCB silkscreen for automated assembly verification.

Key Features

Feature	Design Value
Guard ring construction	Suppresses edge leakage and improves surge survivability during load dump or ESD events.
Low V_F (0.37 V typ @ 20 mA)	Reduces forward conduction loss by >40% vs. standard silicon diodes at light loads, improving light-load efficiency.
Fast t_rr (10 ns)	Minimizes reverse recovery charge (Q_rr) and associated switching loss in high-frequency SMPS.
MiniMELF glass package	Provides hermetic sealing, stable parameter drift over temperature, and compatibility with reflow and wave soldering.

Applications

DC-DC Converter Output Rectification

Reverse Polarity Protection

Use Scenario: Used as secondary-side rectifier in non-synchronous buck converters powering FPGA I/O banks or microcontroller cores.

IC Role / Device Role / Timing Role: Unidirectional current path that blocks reverse voltage while conducting forward current during low-side switch ON phase.

Use Value: 0.60 V V_F at 200 mA lowers conduction loss versus PN diodes, directly increasing 3.3 V rail efficiency by ~2–3% at 200 mA load.

Use Scenario: Placed in series with V_IN to protect downstream LDOs and logic from accidental battery reversal in portable instrumentation.

IC Role / Device Role / Timing Role: Forward-biased conductor during correct polarity; open-circuit blocker during reverse connection.

Use Value: 20 V V_R rating safely covers 12 V nominal inputs with margin, while 350 mA I_F supports typical sensor module current draw.

High-Frequency Snubber Network

Clamp Diode in Signal Line Protection

Use Scenario: Integrated into RCD snubber across MOSFET drain-source in flyback adapters operating at 65–100 kHz.

IC Role / Device Role / Timing Role: Rapidly clamps voltage spikes by conducting during MOSFET turn-off transient.

Use Value: 10 ns t_rr ensures full conduction before spike peak, avoiding delayed turn-on failure common with slower diodes.

Use Scenario: Connected between data line (e.g., UART TX) and V_CC/GND to shunt ESD transients per IEC 61000-4-2 Level 4.

IC Role / Device Role / Timing Role: Low-capacitance path to rail during fast-rising ESD event; remains high-impedance during normal signal swing.

Use Value: 50 pF C_T minimizes signal distortion on 1 Mbps UART lines, unlike higher-C alternatives that degrade edge rate.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB120-E3/54 (Vishay)	20 V V_R, 1 A I_F, 0.55 V V_F @ 1 A, DO-41 package (larger, axial leaded)	Higher current rating but incompatible with SMT MiniMELF footprint; requires through-hole layout change.	Select when board space allows axial mounting and >350 mA average current is required.
NSR0230HT1G (onsemi)	30 V V_R, 200 mA I_F, 0.45 V V_F @ 100 mA, SOD-123 package	Lower current rating and different package; suitable only for sub-200 mA loads with tighter V_F priority.	Select for ultra-low V_F in space-constrained designs where 200 mA limit is acceptable.

Compared with SB120-E3/54 and NSR0230HT1G, LLSD103C-7 uniquely balances 20 V rating, 350 mA current, 0.60 V V_F, and MiniMELF size-making it optimal for compact, medium-current, high-frequency rectification where footprint and thermal profile are constrained.

Availability

LLSD103C-7 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, reverse polarity protection, high-frequency snubber networks, and clamp diode applications requiring stable component supply and consistent MiniMELF form factor.

Supply support for LLSD103C-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 US.

The LLSD103x series belongs to Diodes' high-reliability Schottky diode product line, engineered specifically for efficiency-critical, high-frequency power conversion and protection in consumer, computing, and industrial power supplies.

FAQ

What is the maximum allowable junction temperature for LLSD103C-7?

The absolute maximum junction temperature is +125 °C, with continuous operation permitted across –55 °C to +125 °C. Derating begins above 25 °C ambient per the thermal resistance (250 °C/W) and power dissipation limit (400 mW), requiring thermal design to maintain T_j ≤ 125 °C under worst-case load and airflow conditions.

Can LLSD103C-7 be used in place of LLSD103B-7?

No-LLSD103C-7 has a 20 V V_R rating versus 30 V for LLSD103B-7. Substituting it in circuits with >20 V reverse bias risks premature breakdown. The forward characteristics (V_F, I_F) are identical, but reverse voltage capability is not interchangeable without circuit redesign.

Is the MiniMELF package compatible with standard reflow soldering profiles?

Yes-the MiniMELF package is qualified for lead-free reflow per J-STD-020. Peak temperature must not exceed 260 °C for ≤10 seconds, with ramp rates within JEDEC Class 3 limits. Glass body integrity and solder wetting are validated per MIL-STD-202, Method 208.

Does LLSD103C-7 have SPICE model support?

Yes-Diodes Incorporated provides verified SPICE models for LLSD103C-7, including nonlinear capacitance and temperature-dependent forward conduction parameters. These models are published in the DS30068 datasheet Rev. 2 and downloadable from the manufacturer's website under "Simulation Models" for LLSD103x series.

LLSD103C-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):: 20 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 @ 10 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

LLSD103C-7 FAQ

1.How can I place an order for LLSD103C-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for LLSD103C-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 LLSD103C-7 reliable?

The price and inventory of LLSD103C-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LLSD103C-7 is usually 5 days.

3.What payment methods are accepted for LLSD103C-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LLSD103C-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LLSD103C-7?

LLSD103C-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LLSD103C-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 LLSD103C-7?

For technical support, including LLSD103C-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LLSD103C-7 requirements.

6.How does Aetrix verify that LLSD103C-7 is sourced from the original manufacturer or authorized distributors?

All LLSD103C-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 LLSD103C-7 meets industry standards.

7.What is the process for return or replacement of LLSD103C-7?

All LLSD103C-7 units undergo pre-shipment inspection (PSI). If there is an issue with LLSD103C-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 LLSD103C-7 part is unused and in its original packaging.

Return procedure for LLSD103C-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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