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

STMicroelectronics 1N5818RL

Name: 1N5818RL
Brand: STMicroelectronics
SKU: 1N5818RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5818RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: 1N5818RL.pdf

Description:: DIODE SCHOTTKY 30V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:7,771

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Product details

Overview

1N5818RL from STMicroelectronics is a low-drop axial Schottky rectifier diode rated for 1 A average forward current and 30 V repetitive peak reverse voltage, with a maximum forward voltage drop of 0.50 V at 1 A and 25 °C. It features negligible switching losses, extremely fast switching, and specified avalanche capability-designed for use in switch-mode power supplies, high-frequency DC-DC converters, polarity protection, and small battery chargers.

For engineers reviewing the 1N5818RL datasheet, 1N5818RL pinout, 1N5818RL application, or 1N5818RL equivalent, key selection criteria include its DO-41 axial package thermal resistance (R_th(j-a) = 100 °C/W), surge current rating (I_FSM = 25 A), junction temperature limit (T_j = 150 °C), and low conduction loss profile optimized for low-voltage, high-efficiency rectification.

Technical Context

This Schottky rectifier operates via majority-carrier conduction, eliminating minority-carrier storage delay and enabling nanosecond-scale switching. Its metal-semiconductor junction delivers low forward voltage (V_F ≤ 0.50 V) and low reverse recovery charge (Q_rr ≈ 0 nC), making it suitable for high-frequency operation up to several hundred kHz without snubber networks.

The device is characterized by a specified avalanche energy rating (P_ARM = 1200 W at t_p = 1 µs), defined thermal resistances (R_th(j-l) = 45 °C/W), and stable leakage performance (I_R ≤ 0.5 mA at V_RRM, T_j = 25 °C), supporting reliable operation under transient overvoltage and thermal stress conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	30 V - Maximum repetitive reverse blocking voltage before breakdown; sets usable input range in 24 V DC-DC or 12 V SMPS designs.
I_F(AV)	1 A - Average forward current at T_L = 125 °C, δ = 0.5; defines continuous load-handling capacity on standard PCB traces.
V_F (max)	0.50 V @ 1 A, 25 °C - Low conduction loss enables >95% efficiency in low-voltage output stages (e.g., 3.3 V/5 V rails).
I_FSM	25 A @ 10 ms sine half-cycle - Supports inrush current handling during cold-start or capacitor charging without failure.
T_j(max)	150 °C - Maximum junction temperature; allows operation in sealed enclosures or high-ambient industrial environments with minimal heatsinking.
R_th(j-a)	100 °C/W - Junction-to-ambient thermal resistance with 10 mm lead length; determines required PCB copper area for thermal management.
dV/dt	10,000 V/µs - Critical rate of rise of reverse voltage; ensures immunity to fast transients in high-speed switching nodes.

Pinout & Package

1N5818RL is housed in a DO-41 axial plastic package with cathode indicated by a band. Leads are tinned copper-clad steel, compatible with wave and hand soldering per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., ground or return path) in rectifier configuration; must withstand full surge current.
Cathode	Forward current exit point	Marked with band; connects to positive output rail; carries full load current and reverse-blocking voltage in freewheeling applications.

Key Features

Feature	Design Value
Low forward voltage drop	V_F ≤ 0.50 V @ 1 A enables <0.5 W conduction loss at full rated current, reducing thermal load in compact power supplies.
Extremely fast switching	No reverse recovery time (t_rr ≈ 0 ns) eliminates switching loss and EMI from minority-carrier tail current in high-frequency converters.
Avalanche capability	Rated P_ARM = 1200 W @ 1 µs supports robustness against inductive kickback in flyback or boost converter freewheeling paths.
Negligible switching losses	Zero stored charge (Q_rr ≈ 0) removes need for snubbers or gate-drive optimization in synchronous rectifier replacement roles.
DO-41 axial package	Standard through-hole footprint with 10 mm lead spacing; enables manual prototyping, automated insertion, and compatibility with legacy power supply layouts.

Applications

Switch-Mode Power Supply Rectification

DC-DC Converter Output Stage

Use Scenario: Used as secondary-side rectifier in isolated 5 V/3 A flyback converter operating at 100 kHz.

IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diode to minimize conduction loss and eliminate reverse recovery noise.

Use Value: Reduces output stage power loss by ~0.35 W vs. 1N4007, lowering thermal stress on transformer and output capacitor.

Use Scenario: Output rectifier in non-isolated buck converter powering FPGA core voltage (1.2 V @ 4 A).

IC Role / Device Role / Timing Role: Low-V_F discrete rectifier in synchronous-buck auxiliary path or low-cost asynchronous design.

Use Value: Enables >92% efficiency at full load without active MOSFET control, simplifying layout and BOM.

Polarity Protection Circuit

Small Battery Charger

Use Scenario: Reverse-voltage protection diode in 12 V automotive accessory module powered from vehicle battery.

IC Role / Device Role / Timing Role: Series-connected anode-in protection element preventing damage during battery misconnection.

Use Value: Limits voltage drop to ≤0.5 V at 1 A, preserving >95% of available supply voltage for downstream circuitry.

Use Scenario: Charging path diode in portable NiMH battery charger (3.6 V, 500 mAh) driven by 5 V USB source.

IC Role / Device Role / Timing Role: Isolation and current-direction control between USB port and battery terminals.

Use Value: Prevents battery discharge into USB port while adding only 0.5 V headroom loss, enabling full charging at low input voltages.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB130 (ON Semiconductor)	Same DO-41 package, 30 V V_RRM, but V_F = 0.55 V @ 1 A; higher leakage (I_R = 1.0 mA @ 25 °C).	Slightly lower efficiency in low-voltage outputs; acceptable where thermal margin exists.	Select when cost sensitivity outweighs 50 mV V_F penalty and leakage is not critical.
1N5818 (Digi-Key, Mouser stock version)	Identical electrical specs and DO-41 package; differs only in packaging format (bulk vs. tape-and-reel) and marking.	No functional difference; same thermal, electrical, and mechanical behavior in circuit.	Choose for prototype builds requiring manual placement or smaller order quantities.

Compared with SB130 and 1N5818, the 1N5818RL offers identical performance to the base 1N5818 with tape-and-reel convenience for automated assembly, while maintaining lower forward voltage than SB130-making it optimal for thermally constrained, high-efficiency 1 A rectification tasks.

Availability

1N5818RL is available at Aetrix Electronics and suitable for switch-mode power supplies, DC-DC converters, polarity protection circuits, and small battery chargers requiring stable component supply and consistent DO-41 axial form factor.

Supply support for 1N5818RL 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, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The 1N5818RL belongs to ST's general-purpose Schottky rectifier product line, engineered specifically for high-efficiency, low-voltage rectification in cost-sensitive, high-volume power conversion applications.

FAQ

What is the maximum junction temperature for 1N5818RL?

The absolute maximum junction temperature (T_j) is 150 °C, as specified in Table 2 of the STMicroelectronics datasheet. Operation above this temperature risks permanent degradation of the Schottky barrier and increased leakage. Derating curves in Figure 3 confirm 1 A average current is sustainable only up to ~75 °C ambient with standard DO-41 mounting.

Is 1N5818RL suitable for surface-mount assembly?

No-1N5818RL uses a DO-41 axial leaded package designed for through-hole mounting. It lacks SMD-compatible terminations or thermal pad structure. For surface-mount equivalents, consider ST's SMB/SMA-packaged STPS1L30 or ON Semiconductor's SS13.

Does 1N5818RL have avalanche energy rating?

Yes-1N5818RL is explicitly rated for repetitive avalanche power: 1200 W at pulse width t_p = 1 µs and T_j = 25 °C (Table 2). This rating supports safe operation during inductive switching transients in flyback and boost topologies without external clamping.

How does forward voltage vary with temperature?

V_F decreases with rising junction temperature: typical V_F drops from 0.50 V at 25 °C to ~0.42 V at 125 °C at 1 A (Figure 13). This negative temperature coefficient improves thermal stability in parallel configurations but requires verification of minimum V_F margin in low-temperature startup conditions.

1N5818RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 30 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 500 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 30 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

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

1N5818RL FAQ

1.How can I place an order for 1N5818RL through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5818RL 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 1N5818RL reliable?

The price and inventory of 1N5818RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5818RL is usually 5 days.

3.What payment methods are accepted for 1N5818RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5818RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5818RL?

1N5818RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5818RL 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 1N5818RL?

For technical support, including 1N5818RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5818RL requirements.

6.How does Aetrix verify that 1N5818RL is sourced from the original manufacturer or authorized distributors?

All 1N5818RL 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 1N5818RL meets industry standards.

7.What is the process for return or replacement of 1N5818RL?

All 1N5818RL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5818RL, 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 1N5818RL part is unused and in its original packaging.

Return procedure for 1N5818RL:

1.Submit a request within 90 days.

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

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