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

STMicroelectronics 1N5817RL

Name: 1N5817RL
Brand: STMicroelectronics
SKU: 1N5817RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5817RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: 1N5817RL.pdf

Description:: DIODE SCHOTTKY 20V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:9,984

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Product details

Overview

1N5817RL from STMicroelectronics is a low-drop, axial-lead Schottky rectifier diode rated for 1 A average forward current and 40 V repetitive peak reverse voltage, with a maximum forward voltage drop of 0.45 V at 1 A and 25 °C. It features negligible switching losses, extremely fast switching, and specified avalanche capability - deployed in DC/DC converters, polarity protection circuits, and small battery chargers.

For engineers reviewing the 1N5817RL datasheet, 1N5817RL pinout, 1N5817RL application, or 1N5817RL equivalent, key selection criteria include its DO-41 package thermal resistance (R_th(j-a) = 100 °C/W), surge current rating (25 A, 10 ms), and low conduction loss profile optimized for high-frequency, low-voltage power conversion.

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 ≤ 0.45 V) and high reverse leakage tolerance (0.5 mA at 40 V, 25 °C).

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 operation up to T_j = 150 °C. Avalanche energy handling is characterized at P_ARM = 1200 W (t_p = 1 µs, T_j = 25 °C).

Key Specifications

Parameter	Value and Actual Design Meaning
I_F(AV)	1 A - Sustained DC output current capability in continuous conduction mode
V_RRM	40 V - Maximum repetitive reverse blocking voltage without breakdown
V_F (max)	0.45 V @ 1 A, 25 °C - Low conduction loss enabling >90% efficiency in 3.3–5 V DC/DC stages
I_FSM	25 A @ 10 ms - Surge current tolerance for startup transients and load dumps
T_j (max)	150 °C - Junction temperature limit defining thermal derating envelope
R_th(j-a)	100 °C/W - Thermal resistance from junction to ambient, used to calculate max power dissipation at given T_amb
dV/dt	10,000 V/µs - Critical rate of rise of reverse voltage before unintended turn-on

Pinout & Package

1N5817RL is housed in a DO-41 axial plastic package (Epoxy UL94 V0 compliant), with cathode identified by a band on the body. The device has two terminals: anode and cathode - no internal connections or multi-pin configuration.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input/source side of rectification path; must be at higher potential than cathode during conduction
Cathode	Forward current exit point	Marked with band; connected to output/load side; defines polarity protection direction

Key Features

Feature	Design Value
Low forward voltage drop	V_F ≤ 0.45 V @ 1 A enables reduced I²R loss in compact 5 V/1 A power rails
Extremely fast switching	No reverse recovery time (t_rr ≈ 0 ns) eliminates switching node ringing in >100 kHz SMPS
Avalanche capability	1200 W peak avalanche power (1 µs pulse) supports unclamped inductive switching stress
Negligible switching losses	Majority-carrier operation avoids minority-carrier recombination delay and associated energy loss
High surge current rating	25 A non-repetitive surge withstand allows robustness against capacitor charging and short-circuit events

Applications

DC/DC Converter Output Rectification

Polarity Protection Circuit

Use Scenario: Used as secondary-side rectifier in isolated flyback or buck-derived DC/DC modules delivering 3.3–5 V at ≤1 A.

IC Role / Device Role / Timing Role: Schottky rectifier providing unidirectional current flow with minimal forward loss and zero reverse recovery.

Use Value: Enables >92% conversion efficiency at light-to-moderate loads due to V_F ≤ 0.45 V and absence of t_rr-related losses.

Use Scenario: Placed in series with power input to prevent damage from reversed supply connections in portable instrumentation.

IC Role / Device Role / Timing Role: Unidirectional current gate protecting downstream regulators and microcontrollers from reverse-polarity events.

Use Value: Withstands 40 V reverse bias continuously and conducts <1 µA leakage at 25 °C, minimizing standby power impact.

Small Battery Charger

Free-Wheeling Diode in Low-Voltage Inverters

Use Scenario: Integrated into linear or switch-mode battery chargers for NiMH or Li-ion cells requiring ≤1 A charge current.

IC Role / Device Role / Timing Role: Isolates charging circuitry from battery during AC adapter removal while allowing discharge path control.

Use Value: Low V_F minimizes voltage headroom loss, preserving usable charging voltage across aging battery packs.

Use Scenario: Mounted across inductive loads (e.g., solenoids, relay coils) in 12–24 V automotive or industrial inverters.

IC Role / Device Role / Timing Role: Freewheeling path for stored inductor energy during MOSFET turn-off, clamping voltage spikes.

Use Value: Avalanche-rated construction absorbs 1200 W transient energy (1 µs), preventing MOSFET drain overvoltage failure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SB140-E3/54 (Vishay)	Same DO-41 package, 40 V V_RRM, but V_F = 0.5 V @ 1 A (higher conduction loss)	Slightly lower efficiency in low-voltage, high-current paths; identical surge and thermal specs	Preferred where cost sensitivity outweighs 50 mV V_F penalty
1N5817G (ON Semiconductor)	Identical electrical ratings and DO-41 footprint; RoHS-compliant lead finish differs	No functional difference in circuit behavior or layout; qualified for automotive temp range (−65 to +175 °C)	Selected when extended temperature qualification or alternate supply chain is required

Compared with SB140-E3/54 and 1N5817G, the 1N5817RL offers the lowest forward voltage among DO-41 Schottkys at 0.45 V, directly reducing conduction loss in 3.3–5 V systems - while maintaining full interchangeability in board layout and thermal management.

Availability

1N5817RL is available at Aetrix Electronics and suitable for DC/DC converter design, polarity protection implementation, and small battery charger development requiring stable component supply and consistent DO-41 mechanical compatibility.

Supply support for 1N5817RL 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The 1N5817RL belongs to ST's legacy axial Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained, cost-sensitive applications.

FAQ

What is the maximum junction temperature for continuous operation?

The 1N5817RL is rated for a maximum operating junction temperature of 150 °C under steady-state conditions. This limit applies when thermal design ensures junction-to-ambient temperature rise remains within R_th(j-a) × P_D, and requires proper PCB copper area or heatsinking for sustained 1 A loads above 75 °C ambient.

Does the 1N5817RL have a specified reverse recovery time?

No - as a Schottky barrier diode, the 1N5817RL exhibits no measurable reverse recovery time (t_rr ≈ 0 ns) because conduction relies solely on majority carriers. This eliminates reverse recovery charge (Q_rr) and associated switching losses, making it ideal for high-frequency (>100 kHz) rectification.

Can the 1N5817RL be used in place of a standard PN-junction rectifier like 1N4007?

Yes, but only in low-voltage, high-frequency applications where its 40 V V_RRM and 1 A I_F(AV) are sufficient. Unlike the 1N4007 (1000 V, 1 A), it cannot replace higher-voltage rectifiers - however, its 0.45 V V_F and zero t_rr deliver superior efficiency and EMI performance in 5 V and 12 V SMPS outputs.

Is the 1N5817RL RoHS compliant and halogen-free?

Yes - per STMicroelectronics' ECOPACK® documentation, the 1N5817RL meets RoHS Directive 2011/65/EU and is halogen-free. The DO-41 package uses epoxy conforming to UL94 V0, and material declarations confirm lead-free termination and absence of brominated flame retardants.

1N5817RL 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):: 20 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 450 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 20 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

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

1N5817RL FAQ

1.How can I place an order for 1N5817RL through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5817RL 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 1N5817RL reliable?

The price and inventory of 1N5817RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5817RL is usually 5 days.

3.What payment methods are accepted for 1N5817RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5817RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5817RL?

1N5817RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5817RL 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 1N5817RL?

For technical support, including 1N5817RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5817RL requirements.

6.How does Aetrix verify that 1N5817RL is sourced from the original manufacturer or authorized distributors?

All 1N5817RL 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 1N5817RL meets industry standards.

7.What is the process for return or replacement of 1N5817RL?

All 1N5817RL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5817RL, 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 1N5817RL part is unused and in its original packaging.

Return procedure for 1N5817RL:

1.Submit a request within 90 days.

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

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