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

STMicroelectronics 1N5818

Name: 1N5818
Brand: STMicroelectronics
SKU: 1N5818
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5818

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: 1N5818.pdf

Description:: SCHOTTKY DO15 30V 1A 150C

Quantity:: RFQ Add To RFQ list

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Inventory:24,431

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Product details

Overview

1N5818 from STMicroelectronics is a low-drop axial Schottky rectifier diode rated for 1 A average forward current, 40 V repetitive peak reverse voltage, and 0.50 V forward voltage drop at 1 A and 25 °C. It operates up to 150 °C junction temperature, features negligible switching losses, and is used in high-frequency DC-DC converters, free-wheeling circuits, and battery charger polarity protection.

For engineers reviewing the 1N5818 datasheet, 1N5818 pinout, 1N5818 application, or 1N5818 equivalent, key selection criteria include its 40 V V_RRM, 0.50 V V_F @ 1 A, DO-41 axial package thermal resistance (R_th(j-a) = 100 °C/W), avalanche capability (1200 W @ 1 µs), and suitability for low-voltage, high-frequency power conversion where conduction loss minimization is critical.

Technical Context

The 1N5818 employs a planar Schottky barrier structure enabling ultrafast switching with no minority-carrier storage delay. Its low forward voltage drop directly reduces conduction losses in continuous-current paths, while its specified avalanche capability allows safe operation under transient overvoltage conditions without external clamping.

Thermal performance is defined by R_th(j-a) = 100 °C/W (lead length = 10 mm) and R_th(j-l) = 45 °C/W, supporting reliable operation at T_j ≤ 150 °C. Reverse leakage remains ≤0.5 mA at 25 °C and ≤10 mA at 100 °C under full V_RRM, ensuring stable blocking in ambient temperatures up to 125 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in flyback/freewheeling topologies.
I_F(AV)	1 A - Average forward current at T_L = 125 °C, δ = 0.5; sets continuous DC load capability with standard PCB mounting.
V_F (max)	0.50 V @ 1 A, 25 °C - Low conduction loss enables >95% efficiency in 3–12 V output converters.
I_FSM	25 A @ 10 ms sinusoidal - Withstands short-duration surges common during power-up or fault recovery.
T_j (max)	150 °C - Junction temperature limit; requires thermal design margin when ambient exceeds 75 °C.
R_th(j-a)	100 °C/W - Thermal resistance from junction to ambient (10 mm lead); determines required heatsinking for sustained 1 A operation.
dV/dt	10,000 V/µs - Critical rate of rise of reverse voltage; supports reliable commutation in SMPS operating above 100 kHz.

Pinout & Package

Package: DO-41 axial leaded plastic package (UL94 V0 epoxy), cathode indicated by band. Dimensions: A = 4.07–5.20 mm (length), B = 2.04–2.71 mm (diameter), D = 0.71–0.86 mm (lead diameter), C ≥ 25.4 mm (lead spacing).

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry point	Connected to lower-potential side (e.g., switch node in buck converter); must handle full I_F(AV) and I_FSM.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive); withstands full V_RRM and blocks reverse leakage ≤10 mA at 100 °C.

Key Features

Feature	Design Value
Low forward voltage drop	V_F = 0.50 V @ 1 A, 25 °C - Reduces power dissipation to ≤0.5 W in 1 A continuous applications, minimizing heatsink requirements.
Extremely fast switching	No reverse recovery time (t_rr ≈ 0 ns) - Eliminates switching loss spikes and EMI associated with PN diode recovery in >100 kHz converters.
Avalanche capability	P_ARM = 1200 W @ 1 µs - Enables robustness against inductive kickback without external TVS, simplifying layout in motor drive freewheeling paths.
Negligible switching losses	Zero minority-carrier storage - Allows operation at frequencies up to 1 MHz without efficiency degradation from recovery charge.

Applications

DC-DC Converter Output Rectification

Freewheeling Diode in Buck Regulators

Use Scenario: Used as secondary-side rectifier in non-isolated 5 V/3 A buck converter operating at 500 kHz.

IC Role / Device Role / Timing Role: Schottky rectifier conducting during low-side MOSFET off-time; handles continuous 3 A peak current with minimal V_F-related loss.

Use Value: 0.50 V V_F limits conduction loss to 1.5 W at 3 A, enabling compact thermal design without forced air cooling.

Use Scenario: Placed across inductive load (e.g., solenoid driver) to clamp back-EMF during MOSFET turn-off.

IC Role / Device Role / Timing Role: Freewheeling path providing low-impedance return for stored inductor energy; activated within nanoseconds of switch turn-off.

Use Value: Avalanche rating of 1200 W @ 1 µs absorbs 25 A surge transients, preventing MOSFET failure without snubber circuitry.

Polarity Protection in 12 V Battery Chargers

Low-Voltage Input Protection in Portable Devices

Use Scenario: Series-connected anode-to-input in automotive accessory charger to block reverse battery connection.

IC Role / Device Role / Timing Role: Forward-conducting series diode during correct polarity; blocking reverse current <0.5 mA at 12 V and 25 °C.

Use Value: 0.50 V forward drop introduces only 4.2% loss at 12 V input, preserving charging efficiency versus higher-V_F alternatives.

Use Scenario: Integrated into USB-powered IoT sensor node to prevent damage from miswired 5 V supply inputs.

IC Role / Device Role / Timing Role: Input protection diode placed between connector and LDO input; conducts only during reverse-connection faults.

Use Value: 40 V V_RRM safely isolates 5 V rail from accidental 24 V misapplication, with leakage <10 mA even at 100 °C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB140 (ON Semiconductor)	V_F = 0.55 V @ 1 A, 25 °C; V_RRM = 40 V; same DO-41 package	Higher forward drop increases conduction loss by ~10% at 1 A; identical thermal and surge ratings	Select when cost sensitivity outweighs 0.05 V V_F penalty and SB140 availability is superior.
1N5819 (STMicroelectronics)	V_F = 0.55 V @ 1 A, 25 °C; V_RRM = 40 V; identical package and thermal specs	Same application scope but 0.05 V higher V_F; avalanche power reduced to 900 W @ 1 µs	Choose 1N5818 over 1N5819 when higher avalanche robustness (1200 W vs. 900 W) is required in inductive load switching.

Compared with SB140 and 1N5819, the 1N5818 offers the lowest forward voltage (0.50 V) among DO-41 1 A/40 V Schottkys while maintaining the highest avalanche energy rating (1200 W), making it optimal for thermally constrained or inductively stressed designs where both efficiency and ruggedness are prioritized.

Availability

1N5818 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, freewheeling diode applications, and polarity protection circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant DO-41 packaging.

Supply support for 1N5818 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The 1N5818 belongs to ST's legacy axial Schottky rectifier product line, engineered specifically for cost-sensitive, high-efficiency low-voltage power conversion in space-constrained applications where thermal performance and reliability under transient stress are essential.

FAQ

What is the maximum junction temperature for continuous operation of the 1N5818?

The 1N5818 has a maximum operating junction temperature of 150 °C, as specified in Table 2 of the ST datasheet (Doc ID 6262 Rev 5). This limit applies under steady-state conditions with proper thermal management-specifically, when the lead length is maintained at 10 mm and ambient temperature does not exceed 75 °C for full 1 A average current operation, per Figure 3.

Does the 1N5818 have a specified reverse recovery time (t_rr)?

No-the 1N5818 is a Schottky barrier diode and exhibits no minority-carrier storage; therefore, it has no defined reverse recovery time. The datasheet confirms "extremely fast switching" and "negligible switching losses," consistent with t_rr ≈ 0 ns. This eliminates recovery-related switching loss and EMI, distinguishing it from PN-junction rectifiers.

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

Yes-but only if reverse voltage stress remains below 40 V. While the 1N4007 (1000 V V_RRM) is over-specified for 12 V use, the 1N5818 improves efficiency (0.50 V vs. ~0.9 V V_F) and enables higher-frequency operation. However, it must not be exposed to >40 V transients; additional clamping may be needed in noisy environments.

Is the 1N5818 RoHS compliant and halogen-free?

Yes-the 1N5818 is offered in ECOPACK®-compliant versions meeting RoHS Directive 2011/65/EU. Per Section 2 of the datasheet, ST provides ECOPACK® grades with defined environmental compliance levels, and the DO-41 package uses UL94 V0 epoxy. Halogen-free status is confirmed in ST's ECOPACK® documentation referenced at www.st.com.

1N5818 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Active

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)

1N5818 FAQ

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

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

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

3.What payment methods are accepted for 1N5818?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5818?

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

Once your 1N5818 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?

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

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

All 1N5818 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 meets industry standards.

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

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

Return procedure for 1N5818:

1.Submit a request within 90 days.

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

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