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

STMicroelectronics 1N5820RL

Name: 1N5820RL
Brand: STMicroelectronics
SKU: 1N5820RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5820RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: 1N5820RL.pdf

Description:: DIODE SCHOTTKY 20V 3A DO201AD

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Inventory:2,710

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Product details

Overview

1N5820RL from STMicroelectronics is a low-drop axial power 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 avalanche capability up to 1700 W (1 µs pulse), suited for high-frequency DC/DC converters and battery charger polarity protection.

For engineers reviewing the 1N5820RL datasheet, 1N5820RL pinout, 1N5820RL application, or 1N5820RL equivalent, key selection criteria include its 80 °C/W junction-to-ambient thermal resistance, 10,000 V/µs critical dV/dt rating, 2 mA reverse leakage at 25°C, and suitability for free-wheeling and low-voltage SMPS designs requiring fast recovery and low conduction loss.

Technical Context

This Schottky diode employs a metal–semiconductor junction to eliminate minority-carrier storage delay, enabling extremely fast switching with no reverse recovery time. Its low forward voltage drop (0.475 V @ 3 A) directly reduces conduction loss in high-current, low-voltage paths.

The device features specified avalanche capability (1700 W, 1 µs pulse), validated under controlled test conditions, and exhibits stable thermal performance with R_th(j-l) = 25 °C/W into the lead-critical for lead-mounted reliability without heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum repetitive reverse blocking voltage before breakdown; defines safe operating range in flyback/freewheeling topologies.
I_F(AV)	3 A @ T_L = 100°C, δ = 0.5 - Continuous DC current handling under pulsed thermal conditions; sets PCB trace and layout sizing baseline.
V_F (max)	0.475 V @ I_F = 3 A, T_j = 25°C - Low conduction loss enables >90% efficiency in 3–5 V output converters.
I_FSM	80 A @ t_p = 10 ms - Surge withstand supports inrush and transient overload in battery charging circuits.
R_th(j-a)	80 °C/W (lead length = 10 mm) - Thermal limit for ambient-mounted operation; dictates derating above 50°C ambient.
dV/dt	10,000 V/µs - High critical rate ensures immunity to fast transients in switching node applications.
T_j(max)	150 °C - Maximum junction temperature; enables operation in sealed industrial enclosures with limited airflow.

Pinout & Package

Package: DO-201AD axial plastic case with cathode ring marking; body length 9.5 mm, lead diameter 1.3 mm, axial bend zone ≥15 mm.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to input/source side in rectification; requires adequate copper pour for thermal dissipation.
Cathode (ring-marked end)	Forward current exit / reverse blocking terminal	Marked end connects to load/ground; ring orientation confirms polarity during manual assembly and automated optical inspection.

Key Features

Feature	Design Value
Very small conduction losses	0.475 V forward drop at 3 A enables <0.3 W static loss-reducing thermal stress in compact 5 V/3 A adapters.
Negligible switching losses	No reverse recovery charge (Q_rr ≈ 0) eliminates switching loss spikes in 100–500 kHz DC/DC stages.
Extremely fast switching	Sub-nanosecond turn-off supports clean zero-voltage switching (ZVS) transitions in resonant topologies.
Avalanche capability specified	1700 W (1 µs) rated avalanche energy allows safe clamping of inductive kickback without external snubbers.

Applications

Switch Mode Power Supply Output Rectification

High-Frequency DC/DC Converter Freewheeling

Use Scenario: Secondary-side rectification in 5 V/3 A offline flyback adapter.

IC Role / Device Role / Timing Role: Unidirectional current path with minimal forward loss and no reverse recovery delay.

Use Value: Reduces output stage conduction loss by ~40% vs. standard PN rectifier, improving full-load efficiency from 82% to 87%.

Use Scenario: Freewheeling path in synchronous buck converter operating at 300 kHz.

IC Role / Device Role / Timing Role: Passive clamp for inductor current decay during high-side switch off-time.

Use Value: Eliminates reverse recovery-induced voltage overshoot, reducing EMI filter size by 30%.

Polarity Protection in Portable Chargers

Low-Voltage Inverter Output Stage

Use Scenario: Reverse-input protection in USB-C PD portable power bank (5–12 V input).

IC Role / Device Role / Timing Role: Series-blocking diode preventing damage from misconnected adapters.

Use Value: 0.475 V drop limits voltage loss to <4% at 2 A, preserving usable battery capacity and runtime.

Use Scenario: Output rectification in 24 V AC inverter using push-pull topology.

IC Role / Device Role / Timing Role: High-speed bidirectional current steering during transformer reset cycles.

Use Value: Withstands 10,000 V/µs dV/dt during transformer ringing, avoiding false turn-on and shoot-through risk.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB320-E3/54 (Vishay)	Same DO-201AD package; V_RRM = 20 V, I_F(AV) = 3 A, V_F = 0.5 V @ 3 A - slightly higher forward drop.	Lower avalanche rating (1200 W); less robust in high-energy inductive clamp scenarios.	Preferred where cost sensitivity outweighs marginal efficiency loss and surge margin.
SS32 (ON Semiconductor)	DO-201AD; V_RRM = 20 V, I_F(AV) = 3 A, V_F = 0.5 V @ 3 A; R_th(j-a) = 85 °C/W - 6% higher thermal resistance.	Higher thermal impedance limits continuous current in confined spaces above 60°C ambient.	Acceptable for intermittent-duty chargers but not recommended for 24/7 industrial SMPS.

Compared with SB320-E3/54 and SS32, the 1N5820RL offers the lowest forward voltage (0.475 V), highest avalanche energy (1700 W), and tightest thermal resistance control-making it optimal for efficiency-critical, high-reliability 20 V-class rectification where thermal headroom and transient robustness are design priorities.

Availability

1N5820RL is available at Aetrix Electronics and suitable for switch mode power supplies, high-frequency DC/DC converters, and portable battery charger designs requiring stable component supply and long-term manufacturability.

Supply support for 1N5820RL 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, power, MCU, 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-constrained and thermally demanding applications.

FAQ

Is the 1N5820RL RoHS compliant?

Yes, the 1N5820RL is RoHS compliant per STMicroelectronics' official product documentation dated July 2003 and subsequent compliance updates. It contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and meets EU Directive 2011/65/EU requirements for homogeneous materials.

What is the maximum allowable soldering temperature for DO-201AD package?

The DO-201AD package supports wave and reflow soldering per JEDEC J-STD-020. Peak temperature must not exceed 260°C for ≤10 seconds. Preheat ramp rate ≤3°C/s, and post-solder thermal shock must stay within −65°C to +150°C storage range to avoid epoxy cracking or bond wire fatigue.

Can 1N5820RL replace 1N5819 in existing designs?

Yes-1N5820RL is a direct upgrade: both share DO-201AD package, 20 V V_RRM, and 3 A I_F(AV), but 1N5820RL specifies avalanche capability (1700 W) and tighter V_F (0.475 V vs. 0.45–0.6 V typical for 1N5819), offering improved surge robustness and consistent low-loss performance.

Does 1N5820RL require a heatsink in standard PCB mounting?

No heatsink is required for continuous 3 A operation at ambient ≤50°C with 10 mm lead length and standard FR-4 board. At 70°C ambient, derating to 2.2 A is needed per Fig. 5-1; forced airflow or copper pour ≥250 mm² per lead extends usable current without heatsinking.

1N5820RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 20 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 475 mV @ 3 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-201AD

Operating Temperature - Junction:: 150°C (Max)

1N5820RL FAQ

1.How can I place an order for 1N5820RL through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5820RL 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 1N5820RL reliable?

The price and inventory of 1N5820RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5820RL is usually 5 days.

3.What payment methods are accepted for 1N5820RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5820RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5820RL?

1N5820RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5820RL 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 1N5820RL?

For technical support, including 1N5820RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5820RL requirements.

6.How does Aetrix verify that 1N5820RL is sourced from the original manufacturer or authorized distributors?

All 1N5820RL 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 1N5820RL meets industry standards.

7.What is the process for return or replacement of 1N5820RL?

All 1N5820RL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5820RL, 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 1N5820RL part is unused and in its original packaging.

Return procedure for 1N5820RL:

1.Submit a request within 90 days.

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

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