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Diotec Semiconductor 1N5820
- Part No.:
- 1N5820
- Manufacturer:
- Diotec Semiconductor
- Category:
- Single Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1N5820.pdf
- Description:
- DIODE SCHOTTKY 20V 3A DO201
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
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Product details
Overview
1N5820 from STMicroelectronics is a low-drop axial Schottky rectifier in DO-201AD package, rated for 20 V repetitive peak reverse voltage, 3 A average forward current at 100°C, and 0.475 V max forward voltage at 3 A and 25°C. It delivers negligible switching losses and extremely fast recovery for high-frequency DC/DC converters and SMPS output stages.
For engineers reviewing the 1N5820 datasheet, 1N5820 pinout, 1N5820 application, or 1N5820 equivalent, key selection criteria include its 80 °C/W junction-to-ambient thermal resistance, 10 ms non-repetitive surge rating of 80 A, avalanche capability up to 1700 W (1 µs), and suitability for polarity protection and battery charger freewheeling circuits.
Technical Context
The 1N5820 operates as a unidirectional power rectifier with metal–semiconductor junction architecture enabling near-zero minority-carrier storage and sub-10 ns reverse recovery. Its conduction loss model is defined by P = 0.33 × IF(AV) + 0.035 × IF²(RMS), optimized for duty cycles δ = 0.5.
Thermal design relies on DO-201AD lead-frame geometry: junction-to-lead resistance is 25 °C/W (10 mm lead length), while junction-to-ambient is 80 °C/W under standard mounting. Avalanche energy handling is characterized across pulse durations (1 µs to 100 µs) and junction temperatures (25°C to 125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum reverse blocking voltage before breakdown; sets usable input/output voltage margin in low-voltage SMPS designs. |
| IF(AV) | 3 A at TL = 100°C, δ = 0.5 - Continuous DC output current capability under typical converter thermal conditions. |
| VF (max) | 0.475 V at IF = 3 A, Tj = 25°C - Directly determines conduction loss and efficiency in 3–5 V output rails. |
| IFSM | 80 A (tp = 10 ms, sinusoidal) - Withstands short-circuit or startup surges without failure in battery-fed systems. |
| Rth(j-a) | 80 °C/W (lead length = 10 mm) - Defines minimum heatsinking requirement for ambient temperatures up to 70°C. |
| dV/dt | 10,000 V/µs - Supports operation in high-di/dt switching nodes without spurious turn-on. |
| IR | 2 mA at VR = 20 V, Tj = 25°C - Low leakage preserves efficiency in standby and light-load modes. |
Pinout & Package
DO-201AD axial package with cathode identified by a ring marking. Leads are tinned copper, 1.30 mm diameter, with 25.4 mm overall length and 9.5 mm body length. Mounting requires ≥15 mm straight axial section before bending.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., switch node or ground return) in freewheeling or OR-ing configurations. |
| Cathode | Current exit terminal during forward conduction | Marked with band; ties to output rail or positive bus-determines polarity protection direction and rectification orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.475 V max at 3 A enables >92% efficiency in 3.3 V output converters at full load. |
| Negligible switching losses | No minority-carrier storage eliminates reverse recovery charge (Qrr ≈ 0), removing snubber need in 100–500 kHz designs. |
| Avalanche capability | 1700 W peak (1 µs) allows safe clamping of inductive kickback in relay drivers and motor control flyback paths. |
| High dV/dt immunity | 10,000 V/µs rating prevents false triggering in noisy high-speed gate-drive or transformer-coupled feedback loops. |
Applications
| Switch Mode Power Supply Output Rectification | Battery Charger Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side rectification in 5 V/3 A offline flyback or forward converter. IC Role / Device Role / Timing Role: Unidirectional current path enabling synchronous or asynchronous output stage; replaces slower PN diodes to reduce loss and heat. Use Value: 0.475 V VF cuts conduction loss by ~40% vs. 1N5408, lowering thermal stress on PCB and improving no-load regulation. | Use Scenario: Reverse-polarity protection and freewheeling path in 12 V sealed-lead-acid charger with PWM-controlled transformer. IC Role / Device Role / Timing Role: Blocks reverse current during AC input reversal; provides low-loss recirculation path during MOSFET off-time. Use Value: 80 A IFSM withstands transformer saturation events; 2 mA IR at 25°C minimizes standby drain in always-connected chargers. |
| Polarity Protection in Portable Electronics | DC-DC Converter Catch Diode |
Use Scenario: Input protection for USB-powered instrumentation with external 5 V adapter jack. IC Role / Device Role / Timing Role: Series anode-cathode placement blocks reverse connection; conducts only when correct polarity applied. Use Value: 20 V VRRM covers common adapter overvoltage transients; DO-201AD axial form fits manual assembly and through-hole test fixtures. | Use Scenario: Catch diode in 1 MHz buck converter powering FPGA core voltage (1.2 V @ 6 A). IC Role / Device Role / Timing Role: Provides continuous current path during high-side switch off-time; critical for maintaining inductor current continuity. Use Value: Sub-10 ns recovery avoids cross-conduction loss; 0.475 V VF reduces average power dissipation to <0.3 W at 6 A peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB520-E3/54 (Vishay) | Same DO-201AD package, 20 V VRRM, but 0.52 V VF max at 3 A and 25°C. | Higher conduction loss increases thermal load in compact enclosures above 60°C ambient. | Prefer where cost sensitivity outweighs 50 mV VF penalty and layout allows extra heatsinking. |
| 1N5820RL (STMicroelectronics) | Identical electrical specs; tape-and-reel packaging (1900 pcs) vs. ammopack (600 pcs); same DO-201AD mechanicals. | Enables automated SMT-compatible through-hole insertion via pick-and-place feeders. | Select for high-volume production requiring reel-fed assembly and consistent lead coplanarity. |
Compared with SB520-E3/54, the 1N5820 offers lower forward voltage for better efficiency in thermally constrained designs; compared with 1N5820RL, it shares identical performance but differs only in packaging format and reel quantity-no electrical or thermal trade-offs.
Availability
1N5820 is available at Aetrix Electronics and suitable for switch-mode power supplies, battery chargers, and polarity protection circuits requiring stable component supply and long-term industrial availability.
Supply support for 1N5820 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The 1N582x series belongs to ST's axial Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space- and thermal-constrained applications.
FAQ
What is the maximum junction temperature for continuous operation of the 1N5820?
The 1N5820 has a maximum operating junction temperature of 150°C, validated under steady-state conditions with IF(AV) = 3 A at TL = 100°C and duty cycle δ = 0.5. Derating is required above 100°C ambient per Figure 5-1, and thermal design must ensure Rth(j-a) ≤ 80 °C/W with 10 mm leads.
Does the 1N5820 have avalanche energy rating, and how is it specified?
Yes-the 1N5820 is rated for 1700 W repetitive peak avalanche power at tp = 1 µs and Tj = 25°C, with derating curves provided in Figure 4 (vs. junction temperature) and Figure 3 (vs. pulse duration). This enables reliable clamping of inductive transients without secondary breakdown.
Can the 1N5820 be used in place of a standard PN rectifier like 1N4007?
No-it is not a direct replacement. The 1N5820 has 20 V VRRM versus 1N4007's 1000 V, and its Schottky construction lacks PN junction reverse recovery robustness. It is intended only for low-voltage, high-frequency applications-not general-purpose AC rectification or high-VRRM use cases.
What is the cathode identification method on the 1N5820 DO-201AD package?
The cathode is marked by a single white or black band (cathode ring) located near one end of the cylindrical epoxy body. When mounted axially, the banded end connects to the positive output rail or higher-potential node in rectifier and polarity protection configurations.
1N5820 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diotec Semiconductor
- Series:
- -
- Package/Case:
- DO-201AA, DO-27, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 850 mV @ 9.4 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 2 mA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
- Operating Temperature - Junction:
- -50°C ~ 150°C
1N5820 FAQ
1.How can I place an order for 1N5820 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5820 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 1N5820 reliable?
The price and inventory of 1N5820 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5820 is usually 5 days.
3.What payment methods are accepted for 1N5820?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5820 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5820?
1N5820 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5820 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 1N5820?
For technical support, including 1N5820 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5820 requirements.
6.How does Aetrix verify that 1N5820 is sourced from the original manufacturer or authorized distributors?
All 1N5820 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 1N5820 meets industry standards.
7.What is the process for return or replacement of 1N5820?
All 1N5820 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5820, 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 1N5820 part is unused and in its original packaging.
Return procedure for 1N5820:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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