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

Diodes Incorporated 1N5820-B

Name: 1N5820-B
Brand: Diodes Incorporated
SKU: 1N5820-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5820-B

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: 1N5820-B.pdf

Description:: DIODE SCHOTTKY 20V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:5,215

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Product details

Overview

1N5820-B from Diodes Incorporated is a 3.0A, 20V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.475V @ 3A), high surge capability (80A), and thermal resistance of 40°C/W. It serves as a primary freewheeling or polarity protection diode in DC-DC converters and low-voltage AC/DC adapters.

For engineers reviewing the 1N5820-B datasheet, 1N5820-B pinout, 1N5820-B application, or 1N5820-B equivalent, key selection criteria include its 20V reverse blocking rating, 3.0A average output current at 95°C lead temperature, low V_F for reduced conduction loss, and DO-201AD mechanical compatibility with high-power through-hole layouts.

Technical Context

This Schottky rectifier uses a guard-ringed die construction to enhance transient robustness without compromising switching speed. Its low junction-to-ambient thermal resistance (40°C/W) enables sustained 3.0A operation under natural convection when mounted with 9.5mm lead length and standard copper pad area.

The device exhibits typical junction capacitance of ~100pF at 5V reverse bias (1MHz), supporting high-frequency rectification up to several hundred kHz. Forward voltage remains stable across load currents up to 9.4A in pulse conditions, confirming suitability for peak-current handling in flyback snubbers and synchronous rectifier auxiliary paths.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 12V system polarity protection.
I_O	3.0 A - Average rectified current at 95°C lead temperature; defines continuous power-handling capacity in half-wave configurations.
V_FM	0.475 V @ 3.0A - Low forward voltage minimizes conduction loss and thermal rise in high-efficiency 3.3V/5V supply rails.
I_FSM	80 A - Non-repetitive surge rating (8.3ms half-sine); supports inrush current tolerance in capacitor-input filter stages.
R_JA	40 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area and airflow for thermal management.
T_j Range	–65°C to +125°C - Operating junction temperature range; validated for automotive under-hood and industrial control environments.

Pinout & Package

DO-201AD axial-leaded package with cathode band marking. Leads are tin-plated, solderable per MIL-STD-202 Method 208, and rated for 1.1g mass. Mounting position is unrestricted.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Current entry point during forward conduction	Connected to input/source side in rectifier or freewheeling path; requires trace width sufficient for 3A continuous current.
Cathode (banded end)	Current exit point during forward conduction; reverse-blocking terminal	Connected to output/load side; cathode band orientation must be verified during manual or automated placement.

Key Features

Feature	Design Value
Guard-ringed Schottky die	Enhances ESD and transient immunity without increasing forward voltage-critical for unregulated adapter inputs exposed to line surges.
UL 94V-0 molded plastic case	Meets flammability safety requirements for enclosed power supplies and industrial equipment enclosures.
Low V_F / high I_O ratio	Delivers 3.0A output with only 1.4W conduction loss (0.475V × 3A), reducing heatsink dependency in space-constrained designs.
High I_FSM / I_O ratio (26.7×)	Enables reliable operation during cold-start surges and motor startup transients without bond-wire fusing.

Applications

DC-DC Converter Freewheeling Diode

12V Automotive Polarity Protection

Use Scenario: Used in the freewheeling path of non-synchronous buck converters powering FPGA core rails.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side switch off-time; operates at switching frequencies up to 500kHz.

Use Value: 0.475V V_F reduces power loss by >35% versus standard PN rectifiers, lowering thermal stress on adjacent ICs.

Use Scenario: Installed inline on battery feed to infotainment head units to prevent damage from reverse battery connection.

IC Role / Device Role / Timing Role: Unidirectional blocking element; conducts only during correct polarity; withstands 20V reverse indefinitely.

Use Value: 20V V_RRM margin accommodates 14V nominal systems with load-dump transients up to 18V.

Capacitor-Input AC/DC Adapter Output

Industrial PLC Power Input Stage

Use Scenario: Rectifies secondary winding output in 5V/3A wall adapters with capacitive filtering.

IC Role / Device Role / Timing Role: Half-wave rectifier conducting during positive AC half-cycles; handles peak currents exceeding 9A during capacitor charging.

Use Value: 80A I_FSM rating ensures survival during repeated cold-start capacitor inrush events.

Use Scenario: Mounted on DIN-rail power supply input to protect downstream SMPS from field wiring errors.

IC Role / Device Role / Timing Role: Polarity guard diode placed before bulk capacitor; blocks reverse current while sustaining 3A continuous load.

Use Value: DO-201AD mechanical robustness and –65°C to +125°C rating support operation in unheated factory cabinets.

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, 20V V_RRM, but higher V_F (0.52V @ 3A) and lower I_FSM (50A).	Limited surge margin in high-inrush industrial controls.	Prefer where cost sensitivity outweighs surge robustness; verify I_FSM derating in capacitor-input designs.
SS32 (ON Semiconductor)	SMA package (SMD), 20V V_RRM, 3A I_O, V_F = 0.5V @ 3A; no axial leads.	Requires PCB re-layout; unsuitable for through-hole prototyping or high-vibration mounting.	Select only for volume SMT production; not a drop-in replacement for DO-201AD footprint.

Compared with SB320-E3/54 and SS32, the 1N5820-B offers superior surge tolerance (80A vs. 50A/-) and axial-leaded mechanical stability, making it preferred for ruggedized power entry and freewheeling roles where layout flexibility and transient resilience are prioritized over SMT density.

Availability

1N5820-B is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, automotive polarity protection, and industrial PLC power input stages requiring stable component supply and long-lifecycle availability.

Supply support for 1N5820-B 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The 1N582x series belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-reliability power conversion in consumer, industrial, and automotive applications where low V_F and surge robustness are essential.

FAQ

What is the maximum allowable lead temperature for continuous 3.0A operation?

The 1N5820-B sustains 3.0A average output current at a lead temperature (T_L) of 95°C, as defined in the derating curve (Figure 1). Exceeding this temperature requires proportional current reduction-e.g., 2.0A at 110°C-to maintain reliability and avoid thermal runaway.

Does the 1N5820-B have a specified junction-to-case thermal resistance (R_JC)?

No, R_JC is not specified in the datasheet. Only junction-to-ambient (R_JA = 40°C/W) and junction-to-lead (R_JL = 10°C/W) thermal resistances are provided. R_JL applies to vertical PCB mounting with 12.7mm lead length and 63.5mm × 63.5mm copper pad.

Can the 1N5820-B replace a 1N4007 in a 12V power supply?

Yes, but only if reverse voltage stress stays below 20V. Unlike the 1N4007 (1000V V_RRM), the 1N5820-B's 20V rating makes it unsafe for AC mains rectification. It is appropriate for low-voltage DC outputs (e.g., post-regulator freewheeling) where its 0.475V V_F improves efficiency over the 1N4007's ~0.9V.

Is the DO-201AD package RoHS compliant and lead-free?

Yes-the 1N5820-B is RoHS compliant and features lead-free (Pb-free) terminations per Diodes Incorporated's product change notice. The plating meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is compatible with standard SnPb and lead-free soldering processes.

1N5820-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Bulk

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:: -65°C ~ 150°C

1N5820-B FAQ

1.How can I place an order for 1N5820-B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5820-B 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-B reliable?

The price and inventory of 1N5820-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5820-B is usually 5 days.

3.What payment methods are accepted for 1N5820-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5820-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5820-B?

1N5820-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5820-B 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-B?

For technical support, including 1N5820-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5820-B requirements.

6.How does Aetrix verify that 1N5820-B is sourced from the original manufacturer or authorized distributors?

All 1N5820-B 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-B meets industry standards.

7.What is the process for return or replacement of 1N5820-B?

All 1N5820-B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5820-B, 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-B part is unused and in its original packaging.

Return procedure for 1N5820-B:

1.Submit a request within 90 days.

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

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