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

Diodes Incorporated 1N5819-T

Name: 1N5819-T
Brand: Diodes Incorporated
SKU: 1N5819-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5819-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N5819-T.pdf

Description:: DIODE SCHOTTKY 40V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:40,132

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Product details

Overview

1N5819-T from Diodes Incorporated is a 1.0A, 40V Schottky barrier rectifier in DO-41 package, featuring 0.60V forward voltage at 1.0A, 25A non-repetitive surge capability, and 1.0mA reverse leakage at 25°C. It serves as a low-loss freewheeling diode in DC-DC converters and polarity protection element in 5–24V power rails.

For engineers reviewing the 1N5819-T datasheet, 1N5819-T pinout, 1N5819-T application, or 1N5819-T equivalent, key selection criteria include its 40V blocking rating, 0.60V V_F at rated current, DO-41 thermal resistance (15°C/W junction-to-lead), 110pF junction capacitance, and RoHS-compliant tin-plated leads.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced failure and enables high-frequency switching operation due to low stored charge and absence of minority-carrier recovery. Its metal-semiconductor junction delivers fast switching (<10ns reverse recovery) and low conduction loss in low-voltage power conversion stages.

Designed for unidirectional current flow in half-wave rectification, it operates across –65°C to +125°C with 50°C/W junction-to-ambient thermal resistance on standard PCB mounting. The cathode band marking defines polarity for correct orientation in series-connected or reverse-biased protection configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Peak Reverse Voltage	40 V - Supports DC blocking up to 40V in input filtering or reverse-polarity protection circuits
Forward Voltage @ 1.0A	0.60 V - Reduces conduction loss to ≤0.6W per diode in 1A continuous paths
Surge Current (8.3ms)	25 A - Withstands inrush and short-circuit transients without bond-wire fusing
Reverse Leakage @ 25°C	1.0 mA - Limits standby power loss in battery-backed or always-on systems
Junction Capacitance	110 pF @ 4V - Minimizes high-frequency switching noise coupling in SMPS feedback paths
Thermal Resistance J-to-L	15 °C/W - Enables 1A operation at 90°C lead temperature with minimal heatsinking

Pinout & Package

DO-41 molded plastic package with axial leads; cathode identified by a painted band on the body; anode and cathode terminals are unmarked except for band polarity indication.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point under forward bias	Connected to lower-potential node (e.g., switch-node side in buck converter freewheel path)
Cathode	Current exit point under forward bias; marked with band	Connected to higher-potential node (e.g., output rail in polarity protection or return path in rectifier)

Key Features

Feature	Design Value
Guard ring die construction	Improves ESD and transient immunity without external TVS, reducing BOM count in industrial power supplies
Low forward voltage drop	0.60V at 1A enables ≥92% efficiency in 5V-output buck converters operating at full load
High surge current rating	25A single-half-sine rating supports hot-plug and capacitor-charging events in embedded power modules
RoHS-compliant tin plating	Ensures solderability per MIL-STD-202 Method 208 and eliminates lead-based reflow concerns in Class 2/3 assembly

Applications

DC-DC Converter Freewheeling

Polarity Protection

Use Scenario: Used as the catch diode in non-synchronous buck converters delivering 3.3V/1A from 12V input.

IC Role / Device Role: Provides low-loss current path during high-side MOSFET off-time to maintain inductor current continuity.

Use Value: 0.60V V_F limits conduction loss to 0.6W, reducing thermal stress versus silicon rectifiers with 0.9V drop.

Use Scenario: Placed in series with V_IN to block reverse connection in USB-powered instrumentation.

IC Role / Device Role: Acts as series-blocking element that conducts only when input polarity matches design intent.

Use Value: 40V V_RRM safely withstands accidental 24V reverse connection; 1mA leakage avoids battery drain.

Low-Voltage Inverter Output

Automotive Accessory Power Rail

Use Scenario: Rectifies high-frequency AC from resonant LLC secondary windings in 12V→5V isolated adapters.

IC Role / Device Role: Converts bidirectional transformer output to unidirectional DC with minimal switching loss.

Use Value: 110pF capacitance and <10ns recovery prevent ringing and EMI in >100kHz topologies.

Use Scenario: Protects infotainment head unit power input against battery cable reversal during service.

IC Role / Device Role: First-line defense diode in 12V automotive supply path with IATF 16949-manufactured traceability.

Use Value: Guard ring structure sustains 1000V EFT pulses per ISO 7637-2; RoHS+halogen-free compliance meets OEM specs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB140-T	Same DO-41 package; 40V V_RRM, but 0.55V V_F @ 1A and 1.0A average rating	Slightly lower forward loss; identical thermal envelope and footprint	Select when <0.55V V_F is required for ultra-low-loss 1A paths
1N5819RLG	Identical electrical specs; same DO-41 package; lead-free, halogen-free, and PPAP-capable for automotive use	Qualified to AEC-Q101; includes full IATF 16949 traceability and change control	Select for automotive production where PPAP documentation and AEC qualification are mandatory

Compared with SB140-T and 1N5819RLG, the 1N5819-T offers baseline industrial-grade Schottky performance with RoHS compliance and 25A surge margin, while SB140-T trades marginally lower V_F for identical packaging, and 1N5819RLG adds automotive qualification at no electrical cost.

Availability

1N5819-T is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, polarity protection, and low-voltage inverter output applications requiring stable component supply and DO-41 form factor compatibility.

Supply support for 1N5819-T 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, manufacturing, and sales operations across Asia, Europe, and North America.

The 1N5817–1N5819 series belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-efficiency power conversion in consumer, industrial, and automotive auxiliary systems.

FAQ

What is the maximum junction temperature for continuous operation of the 1N5819-T?

The 1N5819-T has a rated junction temperature range of –65°C to +125°C. For continuous 1.0A operation, the datasheet specifies a maximum lead temperature (T_L) of +90°C, which corresponds to ~125°C junction under typical DO-41 PCB mounting conditions with 9.5mm lead length and 38mm×38mm copper pads.

Can the 1N5819-T be used in place of a 1N4007 in a 24V AC adapter?

No - the 1N5819-T has a 40V peak reverse voltage, insufficient for 24V AC (which produces ~34V peak). The 1N4007's 1000V rating is necessary for universal-input AC/DC adapters. However, the 1N5819-T is appropriate for low-voltage DC-DC stages downstream of bulk rectification where V_RRM ≥ 1.5× nominal DC rail.

Does the 1N5819-T have a specified reverse recovery time?

Schottky diodes like the 1N5819-T do not exhibit minority-carrier reverse recovery; their turn-off is governed by junction capacitance discharge. The datasheet does not specify t_rr but confirms fast switching via low stored charge - measured as <10ns effective recovery in practical high-frequency rectifier applications.

Is the 1N5819-T suitable for automotive under-hood applications?

The standard 1N5819-T is not AEC-Q101 qualified. For under-hood use, Diodes offers the 1N5819RLG variant - identical electrically but manufactured in IATF 16949-certified facilities, PPAP-capable, and fully qualified to AEC-Q101. Thermal derating and board-level protection must still be validated per vehicle-specific requirements.

1N5819-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 600 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 mA @ 40 V

Capacitance @ Vr, F:: 110pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: -65°C ~ 125°C

1N5819-T FAQ

1.How can I place an order for 1N5819-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5819-T 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 1N5819-T reliable?

The price and inventory of 1N5819-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5819-T is usually 5 days.

3.What payment methods are accepted for 1N5819-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5819-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5819-T?

1N5819-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5819-T 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 1N5819-T?

For technical support, including 1N5819-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5819-T requirements.

6.How does Aetrix verify that 1N5819-T is sourced from the original manufacturer or authorized distributors?

All 1N5819-T 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 1N5819-T meets industry standards.

7.What is the process for return or replacement of 1N5819-T?

All 1N5819-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5819-T, 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 1N5819-T part is unused and in its original packaging.

Return procedure for 1N5819-T:

1.Submit a request within 90 days.

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

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