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

STMicroelectronics 1N5819RL

Name: 1N5819RL
Brand: STMicroelectronics
SKU: 1N5819RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5819RL

Manufacturer:: STMicroelectronics

Category:: Single Diodes

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

Datasheet:: 1N5819RL.pdf

Description:: DIODE SCHOTTKY 40V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:12,833

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Product details

Overview

1N5819RL from STMicroelectronics is a low-drop, axial-lead Schottky rectifier diode designed for high-frequency DC-DC conversion and SMPS output rectification. It delivers 1 A average forward current, 40 V repetitive peak reverse voltage, 0.55 V forward voltage at 1 A and 25 °C, and operates up to 150 °C junction temperature - enabling efficient, compact power supplies in battery chargers and polarity protection circuits.

For engineers reviewing the 1N5819RL datasheet, 1N5819RL pinout, 1N5819RL application, or 1N5819RL equivalent, key selection criteria include its low VF (0.55 V @ 1 A), avalanche-rated surge capability (25 A non-repetitive), DO-41 package thermal resistance (Rth(j-a) = 100 °C/W), and suitability for high-frequency switching where conduction loss minimization is critical.

Technical Context

This Schottky rectifier uses a metal-semiconductor junction to eliminate minority-carrier storage delay, enabling negligible switching losses and extremely fast recovery (<10 ns). Its low forward voltage drop stems from optimized barrier height and epitaxial structure, directly reducing conduction loss in low-voltage, high-current paths.

The device features specified avalanche capability (900 W at 1 µs pulse), validated Rth(j-l) = 45 °C/W for lead-to-junction heat transfer, and stable reverse leakage (≤10 mA at 100 °C and VR = 40 V), supporting robust operation in unregulated or transient-prone DC-DC outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A - Sustained DC output current capability in SMPS secondary-side rectification without derating at TL = 125 °C.
VRRM	40 V - Maximum repetitive reverse blocking voltage; sets upper limit for input/output differential in ≤36 V systems.
VF (max)	0.55 V @ 1 A, 25 °C - Directly reduces I²R conduction loss by ~40% vs. comparable PN diodes, improving efficiency in 3.3–12 V rails.
IFSM	25 A @ 10 ms sine - Withstands short-circuit or startup surges in battery charger and adapter applications.
Tj max	150 °C - Enables operation in thermally constrained enclosures without active cooling in industrial or automotive accessory designs.
dV/dt	10,000 V/µs - Supports reliable commutation in high-frequency flyback and forward converters with steep voltage transients.

Pinout & Package

Package: DO-41 axial plastic package with cathode band marking; lead length = 10 mm; epoxy meets UL94 V0; weight = 0.34 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) in half-wave rectification.
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to output rail or filter capacitor positive; blocks reverse voltage up to 40 V.

Key Features

Feature	Design Value
Very small conduction losses	0.55 V VF at 1 A enables <0.55 W dissipation per diode in 1 A output rails, reducing heatsink need.
Extremely fast switching	Zero stored charge yields near-instantaneous turn-off, eliminating reverse recovery spikes in >100 kHz converters.
Avalanche capability specified	900 W peak avalanche power (1 µs) allows safe clamping of inductive switching transients without external snubbers.
Low thermal resistance junction-to-lead	Rth(j-l) = 45 °C/W supports direct PCB copper pour heatsinking via leads, improving power density.

Applications

DC-DC Converter Output Rectification

Battery Charger Polarity Protection

Use Scenario: Used as secondary-side rectifier in isolated 5–12 V, 100–500 kHz flyback or forward converters.

IC Role / Device Role / Timing Role: Schottky rectifier providing unidirectional current path with minimal forward drop and no reverse recovery delay.

Use Value: Reduces conduction loss by ≥35% vs. 1N4007, increasing full-load efficiency from ~82% to ~86% in 5 V/1 A adapters.

Use Scenario: Placed in series with battery input to prevent damage from reversed battery insertion in portable devices.

IC Role / Device Role / Timing Role: Unidirectional current valve blocking reverse current flow during misconnection events.

Use Value: 0.55 V forward drop limits voltage loss in 3.7 V Li-ion paths; 40 V VRRM safely withstands load-dump transients.

SMPS Free-Wheeling Diode

Low-Voltage Inverter Output Stage

Use Scenario: Connected across MOSFET or IGBT in buck or boost regulators to recirculate inductor current during off-time.

IC Role / Device Role / Timing Role: Freewheeling path enabling continuous inductor current and minimizing voltage overshoot at switch node.

Use Value: Fast recovery eliminates voltage ringing; low VF reduces energy loss in inductor discharge cycle, improving light-load regulation.

Use Scenario: Output rectifier in 24 V AC or square-wave inverters driving small motors or LED arrays.

IC Role / Device Role / Timing Role: High-frequency rectification stage converting switched DC to quasi-sinusoidal AC output.

Use Value: 150 °C Tj rating supports ambient temperatures up to 85 °C in sealed enclosures; 25 A IFSM handles motor startup surges.

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; VF = 0.5 V @ 1 A (lower), VRRM = 40 V, IFSM = 30 A (higher).	Slightly better conduction efficiency; higher surge margin supports more aggressive inrush limiting.	Preferred where lowest possible VF dominates over cost; requires validation of Vishay's thermal derating curve.
1N5819-T (ON Semiconductor)	Identical electrical specs (VF, VRRM, IF(AV)); same DO-41 package; RoHS-compliant tape-and-reel variant.	No functional difference; identical pinout, thermal behavior, and reliability profile.	Drop-in replacement with alternate supply chain; verify reel packaging compatibility with pick-and-place equipment.

Compared with SB140-E3/54 and 1N5819-T, the 1N5819RL offers ST's validated avalanche rating (900 W), tighter VF consistency across production lots, and documented thermal impedance curves - making it preferred for designs requiring predictable surge handling and long-term parametric stability.

Availability

1N5819RL is available at Aetrix Electronics and suitable for DC-DC converter output rectification, battery charger polarity protection, SMPS free-wheeling, and low-voltage inverter output stages requiring stable component supply and consistent Schottky performance.

Supply support for 1N5819RL 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The 1N5819RL belongs to ST's legacy axial Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in cost-sensitive, space-constrained applications such as wall adapters and portable electronics.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The 1N5819RL has a maximum junction temperature of 150 °C. At ambient temperatures above 75 °C, derating is required per Figure 4 in the datasheet: average forward current drops linearly from 1 A at 25 °C to ~0.6 A at 100 °C. Thermal design must account for Rth(j-a) = 100 °C/W and ensure sufficient PCB copper area or airflow to maintain Tj ≤ 150 °C under worst-case load and ambient conditions.

Is the 1N5819RL suitable for use in automotive environments?

The 1N5819RL is not qualified as AEC-Q101 automotive grade and lacks extended temperature screening or PPAP documentation. While its 150 °C Tj rating permits operation in under-hood ambient conditions up to 105 °C, ST explicitly states non-automotive-grade parts are used in automotive applications at the user's own risk. For production automotive systems, AEC-Q101-certified alternatives like STPS1H40S should be selected.

How does the avalanche rating impact circuit reliability?

The 1N5819RL's specified 900 W avalanche power at 1 µs ensures controlled energy absorption during inductive switching transients - such as MOSFET turn-off in buck converters - without catastrophic failure. This eliminates the need for external clamping components in many designs and improves system-level robustness against layout-induced voltage spikes, provided pulse duration and repetition rate stay within Figure 5's derating envelope.

Can the 1N5819RL replace a 1N4007 in a linear power supply?

No - the 1N5819RL is unsuitable for 50/60 Hz linear power supplies due to its 40 V VRRM rating, which is insufficient for 120 VAC or 230 VAC rectification (requiring ≥600 V PIV). Additionally, its Schottky construction exhibits higher reverse leakage (up to 10 mA at 100 °C) than silicon PN diodes, risking capacitor discharge and regulation issues in low-frequency, high-impedance filter networks.

1N5819RL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

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:: 550 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

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

1N5819RL FAQ

1.How can I place an order for 1N5819RL through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5819RL 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 1N5819RL reliable?

The price and inventory of 1N5819RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5819RL is usually 5 days.

3.What payment methods are accepted for 1N5819RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5819RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5819RL?

1N5819RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5819RL 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 1N5819RL?

For technical support, including 1N5819RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5819RL requirements.

6.How does Aetrix verify that 1N5819RL is sourced from the original manufacturer or authorized distributors?

All 1N5819RL 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 1N5819RL meets industry standards.

7.What is the process for return or replacement of 1N5819RL?

All 1N5819RL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5819RL, 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 1N5819RL part is unused and in its original packaging.

Return procedure for 1N5819RL:

1.Submit a request within 90 days.

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

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