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Taiwan Semiconductor Corporation LL5817 L0G
- Part No.:
- LL5817 L0G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-213AB, MELF
- Datasheet:
-
LL5817 L0G.pdf
- Description:
- DIODE SCHOTTKY 20V 1A MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,183
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Product details
Overview
LL5817 L0G from Taiwan Semiconductor is a 1A, 20V repetitive peak reverse voltage Schottky barrier rectifier in MELF package, featuring 0.450V max forward voltage at 1A, 25A surge capability, and 125°C max junction temperature. It serves as a low-loss output rectifier in DC-DC converters and AC-DC adapters.
For engineers reviewing the LL5817 L0G datasheet, LL5817 L0G pinout, LL5817 L0G application, or LL5817 L0G equivalent, key selection criteria include VRRM=20V, VF≤0.450V @1A, IFSM=25A, TJmax=125°C, and MELF mechanical compatibility with automated placement systems.
Technical Context
This Schottky rectifier uses a single-die construction optimized for high-efficiency, low-forward-drop operation in medium-current power conversion stages. Its MELF package provides robust thermal performance (RθJA = 80°C/W) and meets JESD201 Class 1A whisker resistance.
The device operates across -65°C to +125°C junction temperature range and exhibits 110pF junction capacitance at 1MHz/4V, supporting stable switching behavior in 50–100kHz converter topologies without excessive capacitive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback or buck output stage |
| IF | 1 A - Continuous average forward current; sets maximum steady-state conduction capacity |
| VF @1A | ≤0.450 V - Low forward drop reduces conduction loss and improves efficiency in 12V/24V output rails |
| IFSM | 25 A - Non-repetitive surge rating; withstands inrush and transient overloads in adapter startup |
| TJ max | +125 °C - Maximum junction temperature; enables operation in enclosed or thermally constrained enclosures |
| CJ | 110 pF - Junction capacitance at 1MHz/4V; minimizes switching node ringing in hard-switched topologies |
Pinout & Package
MELF (Metal Electrode Leadless Face) cylindrical surface-mount package with axial cathode band marking polarity. No discrete pins - terminals are the two circular end faces; cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output filter capacitor positive rail; blocks reverse voltage during off-cycle |
Key Features
| Feature | Design Value |
|---|---|
| RoHS & halogen-free compliance | Meets IEC 61249-2-21; supports environmentally regulated industrial and consumer product certifications |
| Automated placement compatibility | Standard MELF geometry enables high-yield pick-and-place with vacuum nozzles and vision alignment |
| JESD201 Class 1A whisker resistance | Ensures long-term mechanical reliability under thermal cycling in automotive and industrial environments |
| Low thermal resistance (RθJA = 80°C/W) | Enables 1A continuous operation without forced airflow in compact PCB layouts |
Applications
| Inverter Output Rectification | DC-DC Converter Secondary Side |
|---|---|
Use Scenario: Rectifying high-frequency AC from H-bridge in solar microinverters or UPS inverters. IC Role / Device Role / Timing Role: Schottky rectifier providing unidirectional current path with minimal conduction loss. Use Value: 0.450V VF at 1A reduces heat generation vs. silicon diodes, improving inverter efficiency above 92%. | Use Scenario: Output rectification in isolated flyback or forward converters for industrial sensors. IC Role / Device Role / Timing Role: Synchronous rectification alternative where gate drive complexity is avoided. Use Value: 25A IFSM handles startup surges without derating; MELF package fits tight layout constraints. |
| AC-DC Adapter Secondary | LED Driver Constant-Current Stage |
Use Scenario: Secondary-side rectification in 12V/1A wall adapters for IoT gateways. IC Role / Device Role / Timing Role: Primary output rectifier delivering clean DC after transformer isolation. Use Value: 20V VRRM safely covers reflected transients; RoHS/halogen-free compliance meets CE/UKCA requirements. | Use Scenario: Current-path rectification in constant-current LED drivers for signage lighting. IC Role / Device Role / Timing Role: Low-VF rectifier in linear or quasi-resonant LED current regulation loop. Use Value: 110pF CJ limits high-frequency noise injection into current-sense feedback path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB120-E3/54 (Vishay) | VRRM=20V, VF=0.52V @1A, DO-41 package | Through-hole mounting; higher VF increases conduction loss by ~15% | Choose for legacy through-hole designs or manual assembly; not suitable for automated SMT lines |
| SS12 (ON Semiconductor) | VRRM=20V, VF=0.50V @1A, SMA package | SMA footprint differs; requires PCB pad redesign and thermal relief adjustment | Prefer when board space allows flat-profile SMA; verify RθJA (110°C/W) does not exceed thermal budget |
Compared with SB120-E3/54 and SS12, LL5817 L0G delivers the lowest VF (≤0.450V), best surge rating (25A), and MELF's superior thermal mass-making it optimal for high-reliability, high-volume SMT power supplies where efficiency and manufacturability are critical.
Availability
LL5817 L0G is available at Aetrix Electronics and suitable for inverters, DC-DC converters, and AC-DC adapters requiring stable component supply, automated placement compatibility, and RoHS-compliant sourcing.
Supply support for LL5817 L0G 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global power and protection markets since 1979.
The LL5817 L0G belongs to TSC's Schottky rectifier family engineered for cost-sensitive, high-volume power conversion applications demanding low VF, robust surge handling, and reliable MELF packaging.
FAQ
What is the maximum repetitive peak reverse voltage rating for LL5817 L0G?
The LL5817 L0G has a maximum repetitive peak reverse voltage (VRRM) of 20 V. This rating defines the highest reverse voltage the device can block continuously without breakdown. It is validated per JEDEC test conditions and applies across the full operating temperature range of -65°C to +125°C. Designers must ensure circuit peak reverse transients remain below this value to prevent avalanche failure.
Does LL5817 L0G support automated SMT placement?
Yes, LL5817 L0G is specifically designed for automated surface-mount placement. Its standardized MELF package geometry, consistent weight (~120 mg), and smooth cylindrical profile enable reliable vacuum nozzle pickup and accurate vision-based alignment on high-speed pick-and-place machines. The cathode band provides unambiguous polarity identification during optical inspection.
What is the forward voltage of LL5817 L0G at 1A and 25°C?
The forward voltage (VF) of LL5817 L0G is guaranteed ≤0.450 V at IF = 1 A and TA = 25°C, measured under pulse conditions (PW = 0.3 ms). This low VF directly reduces conduction losses in power stages-e.g., cutting I²R loss by ~30% versus typical 0.65V silicon rectifiers at same current-improving overall system efficiency and thermal margin.
Is LL5817 L0G compliant with RoHS and halogen-free standards?
Yes, LL5817 L0G is fully RoHS compliant and halogen-free per IEC 61249-2-21. All materials-including molding compound, lead frame, and plating-meet strict restrictions on lead, cadmium, mercury, hexavalent chromium, PBB, PBDE, and chlorine/bromine compounds. This ensures eligibility for CE, UKCA, and other regulatory marks required for global commercial and industrial equipment.
What is the junction-to-ambient thermal resistance of LL5817 L0G?
The junction-to-ambient thermal resistance (RθJA) of LL5817 L0G is 80°C/W under standard JEDEC test conditions (single device on 1-inch² FR-4 board, 2 oz copper). This value reflects its MELF package's effective heat dissipation capability, allowing 1A continuous operation without heatsinking in typical ambient temperatures up to 75°C-critical for compact adapter and converter designs.
LL5817 L0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-213AB, MELF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 750 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 20 V
- Capacitance @ Vr, F:
- 110pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MELF
- Operating Temperature - Junction:
- -65°C ~ 125°C
LL5817 L0G FAQ
1.How can I place an order for LL5817 L0G through Aetrix?
Please submit a Request for Quotation (RFQ) for LL5817 L0G 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 LL5817 L0G reliable?
The price and inventory of LL5817 L0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LL5817 L0G is usually 5 days.
3.What payment methods are accepted for LL5817 L0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LL5817 L0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LL5817 L0G?
LL5817 L0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LL5817 L0G 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 LL5817 L0G?
For technical support, including LL5817 L0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LL5817 L0G requirements.
6.How does Aetrix verify that LL5817 L0G is sourced from the original manufacturer or authorized distributors?
All LL5817 L0G 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 LL5817 L0G meets industry standards.
7.What is the process for return or replacement of LL5817 L0G?
All LL5817 L0G units undergo pre-shipment inspection (PSI). If there is an issue with LL5817 L0G, 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 LL5817 L0G part is unused and in its original packaging.
Return procedure for LL5817 L0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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