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

Diodes Incorporated 1N5818-T

Name: 1N5818-T
Brand: Diodes Incorporated
SKU: 1N5818-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5818-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

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

Datasheet:: 1N5818-T.pdf

Description:: DIODE SCHOTTKY 30V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:29,527

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Product details

Overview

1N5818-T from Diodes Incorporated is a 1.0A, 30V Schottky barrier rectifier in DO-41 package, featuring 0.55V 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 circuitry for 5V/12V power rails.

For engineers reviewing the 1N5818-T datasheet, 1N5818-T pinout, 1N5818-T application, or 1N5818-T equivalent, key selection criteria include forward voltage drop at rated current, peak repetitive reverse voltage rating, thermal resistance (15°C/W junction-to-lead), surge current tolerance, and RoHS-compliant tin-plated leads for lead-free assembly.

Technical Context

This Schottky rectifier uses guard ring die construction to suppress transient-induced failure and enables high-frequency switching operation up to several hundred kHz due to low junction capacitance (110pF) and absence of minority-carrier storage delay. Its metal-semiconductor junction delivers fast recovery (<10ns) and eliminates reverse recovery charge.

Designed for low-voltage DC power conversion, it operates across -65°C to +125°C with thermal resistance optimized for vertical PCB mounting (9.5mm lead length, 38mm×38mm copper pads). The cathode band marking provides unambiguous polarity identification during manual or automated placement.

Key Specifications

Parameter	Value and Actual Design Meaning
Peak Reverse Voltage	30 V - blocks up to 30V DC or peak AC reverse bias without breakdown
Forward Voltage @ 1.0A	0.55 V - minimizes conduction loss in 1A power paths, reducing heat generation
Surge Current IFSM	25 A - withstands short-duration inrush or fault currents in SMPS output stages
Reverse Leakage @ 25°C	1.0 mA - limits standby power loss in battery-backed or always-on circuits
Junction-to-Lead RθJL	15 °C/W - enables direct thermal coupling to PCB copper for passive cooling at 1A load
Junction Capacitance	110 pF - supports high-frequency rectification up to ~1MHz with minimal switching loss

Pinout & Package

DO-41 molded plastic package (UL 94V-0), 0.3g weight, tin-plated leads solderable per MIL-STD-202 Method 208. Cathode identified by distinct band marking on body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal under forward bias	Connected to lower-potential side (e.g., switch node in buck converter)
Cathode	Current exit terminal under forward bias	Connected to higher-potential rail (e.g., output capacitor positive terminal)

Key Features

Feature	Design Value
Guard ring die construction	Suppresses edge breakdown during voltage transients, improving reliability in noisy environments
Low forward voltage drop	0.55V at 1.0A reduces power dissipation by >40% vs. comparable silicon rectifiers
High surge current rating	25A half-sine capability supports robust operation during startup or overload events
RoHS-compliant tin finish	Enables lead-free reflow soldering without compromising wetting or intermetallic formation

Applications

DC-DC Converter Freewheeling

Polarity Protection

Use Scenario: Used as catch diode in 5V/1A buck converter operating at 500kHz switching frequency.

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

Use Value: 0.55V V_F limits conduction loss to 550mW, enabling compact thermal design without heatsink.

Use Scenario: Placed in series with V_IN rail of industrial sensor module powered from external 12V supply.

IC Role / Device Role / Timing Role: Blocks reverse current if supply polarity is accidentally inverted during field maintenance.

Use Value: 30V V_RRM exceeds 12V nominal input with 100% margin, ensuring safe blocking under worst-case transients.

Low-Voltage AC/DC Adapter

Automotive Accessory Power Rail

Use Scenario: Rectifies 9VAC secondary winding in wall adapter delivering 7.5VDC/800mA to consumer audio device.

IC Role / Device Role / Timing Role: Converts transformer AC output to pulsating DC prior to filtering and regulation.

Use Value: 110pF junction capacitance prevents high-frequency noise coupling into downstream LDO, preserving PSRR.

Use Scenario: Protects USB-C power delivery module in vehicle infotainment system against battery reversal during jump-start.

IC Role / Device Role / Timing Role: Series-connected anode-to-battery-positive to block reverse current flow.

Use Value: -65°C to +125°C operating range meets automotive under-hood ambient requirements without derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB130-T	Same DO-41 package, 30V V_RRM, but 0.45V V_F @ 1A and 10A I_FSM	Lower forward drop improves efficiency in ultra-low-power designs; reduced surge rating limits use in high-inrush systems	Select when minimizing conduction loss is critical and surge events are rare
1N5819-T	Identical package and construction, but 40V V_RRM and 0.60V V_F @ 1A	Higher blocking voltage suits 24V industrial inputs; slightly higher V_F increases thermal load at full current	Select when system requires ≥35V reverse standoff with same footprint and thermal profile

Compared with SB130-T and 1N5819-T, the 1N5818-T offers optimal balance of 30V reverse rating, 0.55V forward drop, and 25A surge tolerance-making it preferred for 12V automotive and industrial DC-DC outputs where both efficiency and robustness matter.

Availability

1N5818-T is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, polarity protection, and low-voltage AC/DC adapter applications requiring stable component supply and consistent parametric performance across production lots.

Supply support for 1N5818-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 the Americas.

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

FAQ

What is the maximum continuous forward current rating for 1N5818-T?

The 1N5818-T is rated for 1.0A average rectified output current at a lead temperature of +90°C. This rating assumes vertical PCB mounting with 9.5mm lead length and 38mm×38mm copper pads. Derating is required above +90°C lead temperature or with reduced copper area.

Does 1N5818-T meet automotive qualification standards?

The standard 1N5818-T is not AEC-Q101 qualified. Diodes offers automotive-grade variants (e.g., 1N5818WQ-T) with AEC-Q101 certification, PPAP documentation, and IATF 16949 manufacturing. For automotive use, specify the 'WQ' suffix and consult Diodes' automotive product definitions page.

How does the guard ring structure improve reliability?

The guard ring die construction surrounds the active Schottky junction with a doped region that redistributes electric field lines away from the junction periphery. This prevents premature edge breakdown during voltage transients or contamination-induced surface leakage, extending operational life in real-world power environments.

Can 1N5818-T be used in place of 1N4007 in a 12V power supply?

Yes, but only where reverse voltage remains below 30V. While the 1N5818-T offers faster switching and lower forward drop than the 1N4007, its 30V V_RRM is significantly lower than the 1N4007's 1000V rating. It is unsuitable for AC mains rectification but ideal for low-voltage DC-DC outputs or secondary-side rectification.

1N5818-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):: 30 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 mA @ 30 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

1N5818-T FAQ

1.How can I place an order for 1N5818-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5818-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 1N5818-T reliable?

The price and inventory of 1N5818-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5818-T is usually 5 days.

3.What payment methods are accepted for 1N5818-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5818-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5818-T?

1N5818-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5818-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 1N5818-T?

For technical support, including 1N5818-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5818-T requirements.

6.How does Aetrix verify that 1N5818-T is sourced from the original manufacturer or authorized distributors?

All 1N5818-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 1N5818-T meets industry standards.

7.What is the process for return or replacement of 1N5818-T?

All 1N5818-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5818-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 1N5818-T part is unused and in its original packaging.

Return procedure for 1N5818-T:

1.Submit a request within 90 days.

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

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