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Diodes Incorporated 1N5821-T
- Part No.:
- 1N5821-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N5821-T.pdf
- Description:
- DIODE SCHOTTKY 30V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:2,606
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Product details
Overview
1N5821-T from Diodes Incorporated is a 3.0A, 30V Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.475V @ 3A), high surge capability (80A), and thermal resistance of 40°C/W. It serves as a low-loss freewheeling or polarity protection diode in DC-DC converters and 12V automotive power rails.
For engineers reviewing the 1N5821-T datasheet, 1N5821-T pinout, 1N5821-T application, or 1N5821-T equivalent, key selection criteria include forward voltage at rated current, peak repetitive reverse voltage, surge current rating, thermal resistance, and DO-201AD mechanical compatibility with through-hole PCB layouts.
Technical Context
This Schottky rectifier uses a guard-ringed die construction to suppress transient-induced failure and improve reliability under inductive switching. Its low VF and fast recovery (<10ns) minimize conduction and switching losses in high-frequency rectification.
The device operates across –65°C to +125°C junction temperature, with lead-temperature derating starting at 95°C and full 3.0A average current only maintainable below that threshold. Thermal resistance to ambient (40°C/W) assumes vertical mounting on 2.5" × 2.5" copper pad per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum non-repetitive reverse voltage before breakdown; sets safe operating limit for 24V system clamping |
| IO | 3.0 A - Average rectified output current at TL = 95°C; requires heatsinking above this lead temp |
| VFM | 0.475 V @ 3.0A - Low conduction loss enables >92% efficiency in 5–12V buck converter outputs |
| IFSM | 80 A - Single half-sine surge rating (8.3ms); supports motor startup and hot-plug transients |
| RJA | 40 °C/W - Junction-to-ambient thermal resistance; defines minimum copper area needed for thermal management |
| Tj Range | –65°C to +125°C - Wide operating range suitable for under-hood automotive and industrial environments |
Pinout & Package
DO-201AD axial-leaded package with cathode band marking. Leads are tin-plated, solderable per MIL-STD-202 Method 208, and rated for any mounting position. Weight: 1.1 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction | Connected to input/switching node; must handle full load current and surge without trace heating |
| Cathode (banded end) | Current exit point during forward conduction | Connected to output/rail; polarity-sensitive for reverse-voltage protection and freewheeling path |
Key Features
| Feature | Design Value |
|---|---|
| Guard-ringed Schottky die | Suppresses edge leakage and improves transient immunity in inductive load switching |
| UL 94V-0 molded plastic case | Meets flammability safety requirements for enclosed industrial and automotive enclosures |
| Low VF at high current | 0.475 V @ 3.0A reduces power dissipation by ~40% vs. comparable silicon rectifiers |
| High IFSM/IO ratio (26.7:1) | Enables robust handling of short-duration overloads without thermal runaway |
Applications
| DC-DC Converter Output Rectification | Automotive Polarity Protection |
|---|---|
Use Scenario: Used in secondary-side rectification of 5–12V synchronous buck converters powering infotainment systems. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss return path during high-side switch off-time. Use Value: 0.475V forward drop minimizes conduction loss, enabling >93% efficiency at 3A load. | Use Scenario: Installed in series with battery feed to prevent damage from reverse battery connection in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional current gate blocking reverse current flow during misconnection events. Use Value: 30V VRRM safely withstands 24V system transients while maintaining low insertion loss. |
| Industrial Power Supply Freewheeling | AC-DC Adapter Input Bridge Leg |
Use Scenario: Placed across relay coils and solenoid drivers in PLC I/O modules to clamp inductive kickback. IC Role / Device Role / Timing Role: Fast-recovery freewheeling path dissipating stored magnetic energy within <10ns. Use Value: Guard-ring structure prevents avalanche-induced degradation during repeated 80A surge events. | Use Scenario: Employed as one leg in single-phase bridge rectifier for 12V wall adapters with capacitive input. IC Role / Device Role / Timing Role: Half-wave rectifier conducting during positive AC half-cycles; derated 20% for capacitor-input filters. Use Value: 3.0A average current rating supports 36W adapter designs with margin at 95°C lead temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB330-E3/57T (Vishay) | Same DO-201AD package, 30V VRRM, but higher VF (0.52V @ 3A) and lower IFSM (60A) | Suitable for lower-surge environments; less robust for motor-driven loads | Prefer when cost sensitivity outweighs surge margin and efficiency needs |
| SS33 (ON Semiconductor) | Same 3A/30V rating but SMC (DO-214AB) surface-mount package; VF = 0.5V @ 3A | Requires rework of through-hole layout; better thermal performance due to lower RJA (30°C/W) | Select for space-constrained boards where automated assembly and thermal headroom are priorities |
Compared with SB330-E3/57T and SS33, the 1N5821-T offers superior surge tolerance (80A vs. 60A/-) and lowest forward voltage in its class, making it optimal for ruggedized through-hole power supplies where efficiency and transient resilience are jointly critical.
Availability
1N5821-T is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive polarity protection, industrial freewheeling circuits, and AC-DC adapter designs requiring stable component supply and long-term manufacturability.
Supply support for 1N5821-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
The 1N582x series belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-effective, high-efficiency power conversion in consumer, industrial, and automotive power supplies.
FAQ
What is the maximum allowable lead temperature for continuous 3.0A operation?
The 1N5821-T sustains 3.0A average output current only when lead temperature (TL) is held at or below 95°C, as specified in the derating curve. Exceeding this temperature requires proportional current reduction-e.g., 2.0A at 110°C-to prevent thermal runaway and ensure 1000+ hour lifetime.
Can the 1N5821-T replace a 1N5822 in a 24V system?
No-the 1N5822 has 40V VRRM, while the 1N5821-T is rated for 30V. In a 24V system with load-dump transients exceeding 30V (common in automotive), the 1N5821-T risks reverse breakdown. Use only if worst-case reverse voltage remains ≤28V RMS (per datasheet VR(RMS) = 21V).
Is the DO-201AD package compatible with wave soldering?
Yes-the leads are tin-plated and compliant with MIL-STD-202 Method 208 for solderability. Recommended wave solder profile: preheat 100–120°C, contact time ≤5 seconds, peak temperature 260°C max. Avoid exceeding 260°C to prevent internal delamination or plastic charring.
Does the 1N5821-T require a heatsink in free-air operation?
Not for 3.0A at TL ≤95°C-but thermal design must account for RJA = 40°C/W. With no added copper, ambient rise exceeds 125°C at full load. A 2.5" × 2.5" copper pad is required per JEDEC test conditions to achieve rated current without forced air or heatsink.
1N5821-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 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:
- 2 mA @ 30 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N5821-T FAQ
1.How can I place an order for 1N5821-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5821-T 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 1N5821-T reliable?
The price and inventory of 1N5821-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5821-T is usually 5 days.
3.What payment methods are accepted for 1N5821-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5821-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5821-T?
1N5821-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5821-T 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 1N5821-T?
For technical support, including 1N5821-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5821-T requirements.
6.How does Aetrix verify that 1N5821-T is sourced from the original manufacturer or authorized distributors?
All 1N5821-T 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 1N5821-T meets industry standards.
7.What is the process for return or replacement of 1N5821-T?
All 1N5821-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5821-T, 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 1N5821-T part is unused and in its original packaging.
Return procedure for 1N5821-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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