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Diotec Semiconductor 1N5817
- Part No.:
- 1N5817
- Manufacturer:
- Diotec Semiconductor
- Category:
- Single Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
1N5817.pdf
- Description:
- DIODE SCHOTTKY 20V 1A DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,428
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Product details
Overview
1N5817 from STMicroelectronics is a low-drop axial Schottky rectifier diode designed for high-frequency DC-DC converters and switch-mode power supplies. It delivers 1 A average forward current, 40 V repetitive peak reverse voltage, 0.45 V max forward voltage at 1 A and 25 °C, and operates up to 150 °C junction temperature - enabling efficient polarity protection and freewheeling in compact battery chargers.
For engineers reviewing the 1N5817 datasheet, 1N5817 pinout, 1N5817 application, or 1N5817 equivalent, key selection criteria include its low VF for reduced conduction loss, DO-41 axial package compatibility with through-hole PCB layouts, avalanche-rated surge capability (25 A non-repetitive), and thermal resistance profile (Rth(j-a) = 100 °C/W) for passive heatsink designs.
Technical Context
The 1N5817 employs a planar Schottky barrier structure optimized for minimal forward voltage drop and negligible switching losses. Its metal–semiconductor junction enables sub-10 ns reverse recovery time and supports operation at frequencies exceeding 100 kHz without significant switching loss penalties.
It features specified avalanche energy handling (1200 W peak, 1 µs pulse), defined thermal limits (Tj max = 150 °C), and stable leakage performance (0.5 mA @ 25 °C, VR = 40 V), making it suitable for unregulated or lightly filtered DC rails where transient overvoltage may occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A - Sustained DC output current capability in SMPS secondary-side rectification |
| VRRM | 40 V - Maximum reverse blocking voltage before breakdown; sets usable input/output voltage range |
| VF (max) | 0.45 V @ 1 A, 25 °C - Low conduction loss reduces heat generation and improves efficiency in low-voltage rails |
| IFSM | 25 A @ 10 ms sine - Withstands short-circuit or startup surges without failure |
| Tj max | 150 °C - Enables operation in thermally constrained enclosures without active cooling |
| Rth(j-a) | 100 °C/W - Predictable junction-to-ambient thermal rise under natural convection on standard PCB traces |
| dV/dt | 10,000 V/µs - Resists false triggering during fast-rising noise transients in high-speed switching nodes |
Pinout & Package
Package: DO-41 axial leaded plastic package with cathode band marking. Leads are tinned copper-clad steel, compatible with wave and hand soldering per J-STD-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., ground or negative rail) in freewheeling or reverse polarity protection |
| Cathode | Forward current exit / reverse blocking terminal | Marked by colored band; connects to positive supply or switched node; blocks reverse current up to 40 V |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.45 V max @ 1 A enables >92% efficiency in 3.3 V or 5 V output rectification |
| Extremely fast switching | No minority-carrier storage; eliminates reverse recovery tail current in high-frequency converters |
| Avalanche capability | Rated for 1200 W repetitive peak avalanche power (1 µs pulse) - handles inductive kickback safely |
| Negligible switching losses | Zero reverse recovery charge (Qrr ≈ 0) eliminates switching loss component in PWM duty cycles |
| High surge current tolerance | 25 A non-repetitive surge withstand supports hot-plug and load-dump events in portable systems |
Applications
| DC-DC Converter Output Rectification | Polarity Protection Circuit |
|---|---|
Use Scenario: Secondary-side rectification in isolated flyback or buck-derived DC-DC modules delivering 3.3 V/5 V at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current path with minimal forward loss and no reverse recovery delay. Use Value: Reduces conduction loss by ~40% vs. standard silicon rectifiers, lowering thermal stress on PCB layout. | Use Scenario: Reverse-voltage blocking in USB-powered peripherals or wall-adaptor-fed devices. IC Role / Device Role / Timing Role: Passive series-blocking element placed between input connector and system rail. Use Value: Prevents damage from misconnected adapters while adding <0.5 V dropout at full load. |
| Freewheeling Diode in Boost Converters | Small Battery Charger Input Stage |
Use Scenario: Flyback path for inductor current during MOSFET off-time in 12 V → 24 V boost topologies. IC Role / Device Role / Timing Role: Provides low-loss return path for stored inductive energy. Use Value: Minimizes voltage overshoot and switching node ringing due to absence of Qrr-induced current reversal. | Use Scenario: AC/DC adapter output stage feeding NiMH or Li-ion charging ICs with ≤1 A charge current. IC Role / Device Role / Timing Role: Ripple smoothing and reverse isolation after bridge rectification. Use Value: Maintains stable output under varying load while limiting self-heating to <15 °C rise at ambient 50 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB140 (ON Semiconductor) | Same DO-41 package; VF = 0.5 V @ 1 A; VRRM = 40 V; IFSM = 30 A | Higher surge rating suits intermittent overload conditions; slightly higher VF increases conduction loss | Prefer when surge margin >25 A is required and 50 mV VF penalty is acceptable |
| 1N5817TR (Diodes Inc.) | Identical electrical specs; tape-and-reel packaging (5000 pcs); same DO-41 mechanical outline | No functional difference; optimized for automated SMT placement despite axial form factor | Select for high-volume production requiring reel-fed assembly and traceable lot control |
Compared with SB140 and 1N5817TR, the ST 1N5817 offers the lowest VF among DO-41 Schottkys at 0.45 V, best suited for thermally sensitive or efficiency-critical low-voltage outputs, while maintaining identical footprint and replacement readiness in legacy through-hole designs.
Availability
1N5817 is available at Aetrix Electronics and suitable for DC-DC converter output rectification, polarity protection circuits, freewheeling diode applications, and small battery charger input stages requiring stable component supply across industrial and consumer design cycles.
Supply support for 1N5817 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The 1N5817 belongs to ST's general-purpose Schottky rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in cost-sensitive, space-constrained applications.
FAQ
Is the 1N5817 suitable for surface-mount assembly?
No - the 1N5817 uses a DO-41 axial leaded package designed exclusively for through-hole mounting. Its leads are spaced for 0.2-inch (5.08 mm) PCB hole centers and require manual or wave soldering. For SMT alternatives, consider SMA or SMB packaged Schottkys like STPS1L40 or SB140T3G.
What is the maximum ambient temperature for continuous 1 A operation?
At 1 A average forward current and δ = 0.5 duty cycle, the 1N5817 can operate continuously up to 75 °C ambient temperature when mounted on a standard epoxy PCB with 10 mm lead length, based on Rth(j-a) = 100 °C/W and Tj limit of 150 °C.
Does the 1N5817 have a specified reverse recovery time (trr)?
No - as a Schottky diode, the 1N5817 has no minority-carrier storage mechanism; its switching is majority-carrier dominated and effectively instantaneous. Datasheet specifies only dV/dt rating (10,000 V/µs), confirming absence of measurable trr or Qrr in practical operation.
Can the 1N5817 replace a 1N4007 in a linear power supply?
Not recommended - while the 1N5817 has lower VF, its 40 V VRRM is insufficient for 1N4007's 1000 V rating. In 120 VAC rectification, peak reverse voltage exceeds 150 V, risking immediate breakdown. Use only in low-voltage DC-DC or battery-fed circuits where reverse voltage stays below 40 V.
1N5817 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diotec Semiconductor
- Series:
- -
- Package/Case:
- DO-204AC, DO-15, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 20 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 750 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
- Operating Temperature - Junction:
- -50°C ~ 150°C
1N5817 FAQ
1.How can I place an order for 1N5817 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5817 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 1N5817 reliable?
The price and inventory of 1N5817 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5817 is usually 5 days.
3.What payment methods are accepted for 1N5817?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5817 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5817?
1N5817 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5817 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 1N5817?
For technical support, including 1N5817 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5817 requirements.
6.How does Aetrix verify that 1N5817 is sourced from the original manufacturer or authorized distributors?
All 1N5817 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 1N5817 meets industry standards.
7.What is the process for return or replacement of 1N5817?
All 1N5817 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5817, 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 1N5817 part is unused and in its original packaging.
Return procedure for 1N5817:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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