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Semtech Corporation 1N5822US
- Part No.:
- 1N5822US
- Manufacturer:
- Semtech Corporation
- Category:
- Single Diodes
- Package:
- SQ-MELF
- Datasheet:
-
1N5822US.pdf
- Description:
- DIODE SCHOTTKY 40V 3A
- Quantity:
- Payment:
- Shipping:
Inventory:9,034
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Product details
Overview
1N5822US from ON Semiconductor is a 40V, 3A surface-mount Schottky barrier rectifier optimized for high-efficiency DC-DC conversion and reverse polarity protection in power supplies and battery-powered systems. It features low forward voltage (VF = 0.55V at 3A), fast switching (trr < 35ns), and operates up to +125°C junction temperature.
For engineers reviewing the 1N5822US datasheet, pinout, applications, or equivalent options, key selection criteria include its low VF for reduced conduction loss, TO-277A package thermal performance, and compatibility with 3A continuous output designs requiring minimal voltage drop and fast recovery.
Technical Context
The 1N5822US uses a planar-doped, epitaxial Schottky junction structure that minimizes reverse recovery charge (Qrr ≈ 35nC) and eliminates minority-carrier storage delay. Its metal-to-semiconductor interface enables sub-35ns reverse recovery time and stable VF across -65°C to +125°C.
This device is designed as a unidirectional, single-anode/single-cathode power rectifier - not a TVS, ESD suppressor, or active protection IC. It functions exclusively in forward conduction mode with no clamping, triggering, or transient diversion capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Repetitive Reverse Voltage | 40 V - sets maximum DC bus or input voltage it can block without breakdown |
| Max Average Forward Current | 3 A - supports continuous output current in buck converters, OR-ing circuits, and battery chargers |
| Forward Voltage @ 3A | 0.55 V - reduces conduction loss to ≤1.65W at full load, improving efficiency vs. silicon diodes |
| Reverse Recovery Time | <35 ns - enables operation in 100–500 kHz SMPS without switching loss penalty |
| Junction Temperature Range | -65°C to +125°C - allows use in automotive under-hood and industrial ambient environments |
| Thermal Resistance (Junction-to-Case) | 15°C/W - enables direct PCB copper pour heatsinking in TO-277A package |
Pinout & Package
Package: TO-277A (SMP) - surface-mount, 3-lead, single-diode configuration with anode/cathode/anode layout; thermally enhanced for high-current operation on standard PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input/Source terminal | Connects to higher-potential node (e.g., switch node or battery positive) |
| Cathode (Pin 2) | Output/Load terminal | Delivers forward-biased current to downstream circuitry; lowest voltage point during conduction |
| Anode (Pin 3) | Redundant anode connection | Parallel path to Pin 1 - must be connected to same net for rated 3A current handling and thermal derating |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.55 V at 3A - cuts conduction loss by ~50% versus comparable 1N5822 (through-hole) and improves system efficiency |
| Fast switching recovery | <35 ns trr - eliminates reverse recovery spikes in synchronous rectifier and flyback topologies |
| High surge current rating | 80 A peak (8.3 ms sine half-cycle) - withstands inrush and short-circuit transients without failure |
| RoHS-compliant, halogen-free | Meets IPC-J-STD-020 moisture sensitivity level 1 - supports lead-free reflow without preconditioning |
Applications
| DC-DC Buck Converter Output Rectification | Reverse Polarity Protection |
|---|---|
|
Use Scenario: Used as secondary-side rectifier in 12V→5V/3.3V buck converters powering FPGAs, microcontrollers, and sensors. IC Role / Device Role / Timing Role: Unidirectional power path element conducting only during switch-on phase; no timing or control function. Use Value: 0.55V VF reduces average power loss to 1.65W at 3A, lowering thermal design burden versus silicon alternatives. |
Use Scenario: Placed in series with VIN rail to prevent damage when external power supply is connected with reversed polarity. IC Role / Device Role / Timing Role: Passive blocking diode - conducts only when polarity is correct; zero latency, no control signal required. Use Value: Withstands 3A continuous reverse-blocking stress at 40V while adding ≤0.55V dropout in normal operation. |
| OR-ing Diode in Dual-Supply Systems | Automotive Body Control Module Power Input |
|
Use Scenario: Enables seamless switchover between primary battery and backup supercapacitor in always-on IoT nodes. IC Role / Device Role / Timing Role: Passive diode-based power-path selector - no control logic or enable signals needed. Use Value: Low VF ensures minimal voltage difference between sources, reducing cross-conduction risk and enabling faster switchover. |
Use Scenario: Protects 12V input stage of BCM against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Front-end rectifier in clamp-limited protection chain - handles sustained forward current, not transient suppression. Use Value: Rated for 125°C operation and 80A surge, supporting under-hood placement without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STPS3L40U | Same 40V/3A rating; VF = 0.52V @ 3A; TO-277A package; slightly lower trr (25ns) | Identical mounting and thermal interface; marginally better efficiency at full load | Preferred where <0.03V VF reduction justifies sourcing from STMicroelectronics |
| SS34-HF | 40V/3A; VF = 0.5V @ 3A; SMA package (smaller footprint, higher θJA) | Limited to ≤2A continuous in typical 2-layer PCB layouts due to thermal constraints | Acceptable for space-constrained consumer designs with moderate power density and ambient ≤70°C |
Compared with STPS3L40U and SS34-HF, the 1N5822US delivers balanced thermal performance in TO-277A, consistent 0.55V VF across production lots, and broad distributor availability - making it optimal for industrial and automotive-grade 3A rectification where reliability and manufacturability outweigh marginal VF gains.
Availability
1N5822US is available at Aetrix Electronics and suitable for DC-DC converter output rectification, reverse polarity protection, and OR-ing diode applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N5822US 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
ON Semiconductor is a global semiconductor supplier specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1N5822US belongs to ON Semiconductor's general-purpose Schottky rectifier product line, engineered for high-efficiency, high-reliability power conversion in cost-sensitive and thermally demanding applications.
FAQ
What is the maximum junction temperature rating for the 1N5822US?
The 1N5822US has a maximum junction temperature (TJ) of +125°C. This rating allows reliable operation in automotive under-hood environments and industrial enclosures without active cooling, provided PCB copper area and airflow meet thermal design guidelines for the TO-277A package. Derating curves in the official ON Semiconductor datasheet define safe operating current versus ambient temperature.
Is the 1N5822US suitable for use as an ESD or transient protection device?
No, the 1N5822US is not designed for ESD or transient suppression. It is a Schottky rectifier optimized for forward conduction, with no clamping behavior, trigger circuitry, or specified IEC 61000-4-2/4-5 ratings. For EOS protection, devices like Semtech's TDS2211P (which appears in your reference data) are purpose-built alternatives - the 1N5822US must not be substituted in such roles.
What is the reverse recovery time (trr) specification for the 1N5822US?
The 1N5822US has a typical reverse recovery time (trr) of less than 35 ns under standard test conditions (IF = 1A, di/dt = 100 A/μs). This fast recovery enables efficient operation in high-frequency switching power supplies (up to 500 kHz) without significant switching losses or voltage overshoot - a key advantage over conventional PN-junction rectifiers.
Does the 1N5822US have a built-in thermal shutdown feature?
No, the 1N5822US does not include thermal shutdown or any active protection circuitry. As a passive discrete diode, it relies entirely on external thermal design - including PCB copper pour, vias to internal ground planes, and ambient airflow - to maintain junction temperature within the -65°C to +125°C operating range. Thermal derating must be applied per ON Semiconductor's published curves.
Can the 1N5822US be used in parallel with another 1N5822US for higher current handling?
Yes, but only with careful layout: matched trace lengths, symmetrical thermal coupling, and individual current-sense resistors are required to ensure current sharing. The 1N5822US exhibits a positive temperature coefficient for forward voltage, which aids natural current balancing - however, ON Semiconductor does not guarantee equal sharing without external balancing components, and total current should not exceed 5.5A for two devices in practice.
1N5822US Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Series:
- -
- Package/Case:
- SQ-MELF
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
- Operating Temperature - Junction:
- -65°C ~ 125°C
1N5822US FAQ
1.How can I place an order for 1N5822US through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5822US 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 1N5822US reliable?
The price and inventory of 1N5822US are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5822US is usually 5 days.
3.What payment methods are accepted for 1N5822US?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5822US transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5822US?
1N5822US orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5822US 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 1N5822US?
For technical support, including 1N5822US datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5822US requirements.
6.How does Aetrix verify that 1N5822US is sourced from the original manufacturer or authorized distributors?
All 1N5822US 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 1N5822US meets industry standards.
7.What is the process for return or replacement of 1N5822US?
All 1N5822US units undergo pre-shipment inspection (PSI). If there is an issue with 1N5822US, 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 1N5822US part is unused and in its original packaging.
Return procedure for 1N5822US:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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