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Taiwan Semiconductor Corporation 1N5821
- Part No.:
- 1N5821
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N5821.pdf
- Description:
- DIODE SCHOTTKY 30V 3A DO201AD
- Quantity:
- Payment:
- Shipping:
Inventory:1,216
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Product details
Overview
1N5821 from STMicroelectronics is a low-drop axial power Schottky rectifier in DO-201AD package, rated for 30 V repetitive peak reverse voltage, 3 A average forward current at 110°C, and 0.5 V max forward voltage at 3 A and 25°C. It serves as a high-efficiency output rectifier in switch-mode power supplies and DC–DC converters.
For engineers reviewing the 1N5821 datasheet, 1N5821 pinout, 1N5821 application, or 1N5821 equivalent, key selection criteria include its low conduction loss (0.5 V @ 3 A), negligible switching losses, 10,000 V/µs dV/dt rating, and avalanche capability up to 1700 W (1 µs pulse).
Technical Context
The 1N5821 operates as a unidirectional power rectifier with metal–semiconductor junction architecture, enabling extremely fast recovery (no minority-carrier storage) and minimal reverse recovery charge. Its thermal design relies on junction-to-ambient resistance of 80 °C/W (lead length = 10 mm) and junction-to-lead resistance of 25 °C/W.
It supports pulsed operation with surge current up to 80 A (10 ms sinusoidal), exhibits controlled avalanche behavior with normalized derating curves across temperature and pulse duration, and maintains stable reverse leakage (≤2 mA @ 25°C, ≤20 mA @ 100°C) under rated VRRM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum reverse blocking voltage before breakdown; sets usable input/output voltage range in buck or flyback outputs. |
| IF(AV) | 3 A @ TL = 110°C, δ = 0.5 - Continuous DC output current capability with standard PCB mounting and 50% duty cycle. |
| VF (max) | 0.5 V @ IF = 3 A, Tj = 25°C - Low forward drop directly reduces conduction loss and improves efficiency in low-voltage, high-current rails. |
| IFSM | 80 A @ tp = 10 ms - Withstands short-term overload during startup or fault conditions without failure. |
| dV/dt | 10,000 V/µs - High critical rate of rise ensures immunity to false turn-on in high-dv/dt switching environments like synchronous rectification circuits. |
| Rth(j-a) | 80 °C/W - Thermal resistance defines required heatsinking margin; limits ambient operating temperature to ~75°C for full 3 A load without derating. |
Pinout & Package
Package: DO-201AD axial leaded plastic package with cathode ring marking; body length 9.5 mm, lead diameter 1.3 mm, total axial length ≥25.4 mm; meets UL94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., switch node in buck converter); must withstand surge current and thermal cycling. |
| Cathode (ring-marked end) | Current exit terminal during forward conduction | Connected to output rail or ground return; polarity protection depends on correct orientation relative to load. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.5 V max @ 3 A enables >92% efficiency in 5 V-output SMPS at full load, reducing heat sink requirements. |
| Negligible switching losses | No minority carrier storage eliminates reverse recovery time and associated switching loss, critical for >100 kHz operation. |
| Avalanche capability | 1700 W peak avalanche power (1 µs) provides robustness against inductive switching transients without external snubbers. |
| Extremely fast switching | Sub-nanosecond reverse recovery enables use in high-frequency DC–DC converters (e.g., 500 kHz–1 MHz point-of-load designs). |
Applications
| Switch-Mode Power Supply Output Rectification | Battery Charger Polarity Protection |
|---|---|
Use Scenario: Secondary-side rectification in isolated 12 V/3 A offline flyback adapter. IC Role / Device Role / Timing Role: Unidirectional power transfer element converting transformer AC output to regulated DC; no timing or control function. Use Value: 0.5 V forward drop cuts conduction loss by ~40% vs. standard PN rectifier, improving thermal margin and enabling compact enclosure design. | Use Scenario: Reverse-polarity protection in portable 12 V lead-acid battery charger. IC Role / Device Role / Timing Role: Series-blocking diode preventing damage when battery leads are swapped; operates in steady-state forward bias. Use Value: Low VF minimizes voltage drop across protection path, preserving charging voltage accuracy and reducing self-heating at 3 A continuous. |
| DC–DC Converter Freewheeling Diode | Low-Voltage Inverter Free-Wheeling Path |
Use Scenario: Freewheeling path in non-synchronous 5 V/3 A buck converter driving industrial sensors. IC Role / Device Role / Timing Role: Provides current continuity during high-side MOSFET off-time; conducts only during discontinuous conduction mode (DCM) intervals. Use Value: Fast recovery prevents cross-conduction risk and enables stable DCM operation up to 1 MHz switching frequency. | Use Scenario: Freewheeling diode in 24 V H-bridge inverter for small AC motor drive. IC Role / Device Role / Timing Role: Clamps inductive kickback during PWM dead-time; handles bidirectional current reversal at 20 kHz fundamental. Use Value: 10,000 V/µs dV/dt rating prevents spurious turn-on during rapid bus voltage transitions, ensuring reliable commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB330 (Vishay) | Same DO-201AD package, 30 V VRRM, but 0.52 V VF @ 3 A and 60 A IFSM. | Slightly higher conduction loss; lower surge rating reduces margin in high-inertia motor drives. | Prefer where cost sensitivity outweighs 30 mV VF penalty and surge events are infrequent. |
| SS34 (ON Semiconductor) | DO-214AC (SMA) surface-mount package, 40 V VRRM, 0.55 V VF @ 3 A, 100 A IFSM. | Not pin-compatible; requires PCB redesign; higher VRRM suits wider input ranges but increases capacitance (25 pF vs. 1N5821's 15 pF). | Select for SMT production or systems needing higher reverse margin and surge immunity, accepting layout change. |
Compared with SB330 and SS34, the 1N5821 offers the lowest forward voltage in axial through-hole form factor, optimal thermal resistance for lead-mounted heatsinking, and balanced surge/avalanche performance-making it preferred for cost-sensitive, thermally constrained, and legacy through-hole SMPS designs.
Availability
1N5821 is available at Aetrix Electronics and suitable for switch-mode power supplies, battery chargers, and DC–DC converters requiring stable component supply, long-life availability, and consistent DO-201AD mechanical compatibility.
Supply support for 1N5821 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The 1N582x series belongs to ST's high-reliability discrete power portfolio, engineered specifically for high-frequency, low-loss rectification in space- and thermally-constrained power conversion stages.
FAQ
Is the 1N5821 suitable for synchronous rectification circuits?
No. The 1N5821 is a passive Schottky diode and lacks gate control or driver interface. It functions only as a freewheeling or output rectifier in non-synchronous topologies. For synchronous rectification, actively controlled MOSFETs with dedicated drivers are required.
What is the maximum ambient temperature for continuous 3 A operation?
At 3 A average forward current and δ = 0.5, the maximum ambient temperature is approximately 75°C when mounted with 10 mm lead length on standard epoxy PCB, based on Rth(j-a) = 80 °C/W and Tj(max) = 150°C. Derating is required above this temperature.
Does the 1N5821 have a specified reverse recovery time (trr)?
No-Schottky diodes like the 1N5821 exhibit majority-carrier conduction and have no measurable reverse recovery time. The datasheet confirms "negligible switching losses" and absence of stored charge, making trr effectively zero and eliminating related switching loss.
Can the 1N5821 replace a 1N5822 in a 24 V system?
Only if reverse voltage stress remains below 30 V. The 1N5822 has 40 V VRRM; substituting the 1N5821 (30 V) risks breakdown during line transients or ringing. Verify worst-case reverse voltage including overshoot before replacement-do not assume functional equivalence based on package or current rating alone.
1N5821 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-201AD, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 500 µA @ 30 V
- Capacitance @ Vr, F:
- 200pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201AD
- Operating Temperature - Junction:
- -55°C ~ 125°C
1N5821 FAQ
1.How can I place an order for 1N5821 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5821 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 reliable?
The price and inventory of 1N5821 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5821 is usually 5 days.
3.What payment methods are accepted for 1N5821?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5821 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5821?
1N5821 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5821 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?
For technical support, including 1N5821 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5821 requirements.
6.How does Aetrix verify that 1N5821 is sourced from the original manufacturer or authorized distributors?
All 1N5821 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 meets industry standards.
7.What is the process for return or replacement of 1N5821?
All 1N5821 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5821, 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 part is unused and in its original packaging.
Return procedure for 1N5821:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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