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Diodes Incorporated 1N5818-B
- Part No.:
- 1N5818-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5818-B.pdf
- Description:
- DIODE SCHOTTKY 30V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,641
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Product details
Overview
1N5818-B from Diodes Incorporated is a 1.0A, 30V Schottky barrier rectifier in DO-41 package, featuring 0.55V forward voltage at 1.0A, 25A non-repetitive surge capability, and 1.0mA reverse leakage at 25°C. It serves as a low-loss freewheeling diode in DC-DC converters and polarity protection element in 5–12V power rails.
For engineers reviewing the 1N5818-B datasheet, 1N5818-B pinout, 1N5818-B application, or 1N5818-B equivalent, key selection criteria include forward voltage drop at rated current, peak repetitive reverse voltage rating, thermal resistance (15°C/W junction-to-lead), surge robustness, and RoHS-compliant tin-plated leads for lead-free assembly.
Technical Context
This Schottky rectifier uses guard ring die construction to suppress transient-induced failure and enables high-frequency switching operation due to low junction capacitance (110pF at 1MHz, 4V reverse bias). Its metal-semiconductor junction delivers fast recovery (<10ns) and eliminates minority-carrier storage delay.
Thermal performance is defined by 15°C/W junction-to-lead resistance under PCB-mounted conditions (9.5mm lead length, 38mm × 38mm copper pads), supporting continuous 1.0A conduction at 90°C lead temperature. The cathode band marking provides unambiguous polarity identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum repetitive reverse voltage before breakdown; sets safe operating limit in 24V system clamping or 12V rail reverse protection |
| VFM @ 1.0A | 0.55 V - Forward voltage drop defining conduction loss; yields ~0.55W dissipation at full load |
| IFSM | 25 A - Non-repetitive surge current handling; withstands inrush in SMPS input stages or motor flyback events |
| IRM @ 25°C | 1.0 mA - Reverse leakage at rated blocking voltage; critical for low-power standby circuits |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or lead frame |
| CT | 110 pF - Junction capacitance at 1MHz/4V; limits high-frequency noise coupling in EMI-sensitive buck converters |
Pinout & Package
DO-41 molded plastic package with axial leads, UL 94V-0 flammability rating, 0.3g mass, and cathode band polarity marking. Tin-plated leads meet MIL-STD-202 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal under forward bias | Connected to lower-potential node (e.g., switch node in buck converter or battery negative in reverse protection) |
| Cathode | Current exit terminal under forward bias; marked with band | Connected to higher-potential node (e.g., output rail or battery positive); determines conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Suppresses edge breakdown during voltage transients, improving reliability in automotive load-dump environments |
| Low forward voltage (0.55V @ 1A) | Reduces conduction loss by >40% vs. comparable silicon rectifiers, enabling higher efficiency in 5–12V DC-DC stages |
| High surge capability (25A IFSM) | Survives repeated inrush currents in adapter inputs and motor drive freewheeling without degradation |
| RoHS-compliant tin finish | Enables lead-free reflow soldering at 260°C peak without dewetting or intermetallic formation issues |
Applications
| DC-DC Converter Freewheeling | USB Power Polarity Protection |
|---|---|
Use Scenario: Placed across synchronous buck converter's low-side switch to recirculate inductor current during off-time. IC Role / Device Role / Timing Role: Freewheeling diode providing continuous current path; operates during 100ns–1µs dead time intervals. Use Value: 0.55V VFM minimizes conduction loss, while 25A IFSM handles peak inductor current surges without thermal runaway. | Use Scenario: Series-connected anode-to-USB VBUS to block reverse current from downstream peripherals back into host port. IC Role / Device Role / Timing Role: Unidirectional current gate; conducts only when VBUS > peripheral supply, preventing backfeed damage. Use Value: 30V VRRM exceeds USB 2.0/3.0 max VBUS (5.5V), and 1.0mA IRM ensures negligible standby drain on battery-powered hosts. |
| 12V Automotive Accessory Rail | Industrial Sensor Power Input |
Use Scenario: Installed between vehicle battery and accessory module to prevent reverse polarity connection damage. IC Role / Device Role / Timing Role: Polarity protection diode; blocks current if battery terminals are swapped during installation. Use Value: 1.0A IO rating supports typical accessory loads (e.g., GPS, cameras); DO-41 package allows through-hole mounting on ruggedized PCBs. | Use Scenario: Used in 24V industrial sensor node input stage to clamp ESD transients and block reverse voltage from field wiring errors. IC Role / Device Role / Timing Role: Transient-suppressing rectifier; guards against ±8kV contact ESD per IEC 61000-4-2 via guard ring structure. Use Value: 15°C/W RθJL enables stable operation at 70°C ambient without derating; 110pF CT avoids signal integrity impact on 4–20mA loop timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB130 (ON Semiconductor) | Same DO-41 package, 30V VRRM, but 0.85V VFM @ 1A (300mV higher drop) | Higher conduction loss reduces efficiency in thermally constrained 12V systems | Select when cost priority outweighs 0.3W extra dissipation at full load |
| SS14 (Vishay) | DO-214AC (SMA) surface-mount package, 40V VRRM, 0.5V VFM @ 1A | Requires PCB redesign; unsuitable for through-hole legacy designs | Choose for space-constrained SMT layouts needing higher voltage margin and lower VF |
Compared with SB130, 1N5818-B offers lower forward loss and better thermal performance; versus SS14, it retains axial-leaded compatibility for service replacement and manual assembly but trades off voltage headroom and footprint size.
Availability
1N5818-B is available at Aetrix Electronics and suitable for DC-DC converter freewheeling, USB power polarity protection, and 12V automotive accessory rail applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N5818-B 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 ASE, J-Devices, and internal fabs.
The 1N5817–1N5819 series belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-efficiency power conversion in consumer, industrial, and automotive auxiliary systems.
FAQ
What is the maximum junction temperature for continuous operation of the 1N5818-B?
The 1N5818-B has an operating junction temperature range of –65°C to +125°C. For continuous 1.0A operation, the lead temperature must be held at ≤90°C per datasheet derating curves, corresponding to ~110°C junction temperature under typical PCB mounting conditions with 15°C/W RθJL.
Can the 1N5818-B replace a 1N4007 in a 12V power supply?
No - the 1N5818-B (30V VRRM) lacks the 1000V reverse voltage rating of the 1N4007 and would fail catastrophically in AC-line rectification. It is only suitable for low-voltage DC applications such as DC-DC outputs, battery protection, or low-VF freewheeling where reverse voltage stays below 30V.
Is the 1N5818-B qualified for automotive use per AEC-Q101?
No - the standard 1N5818-B is not AEC-Q101 qualified. Diodes offers automotive-grade variants (e.g., 1N5818WQ) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. Standard parts require separate qualification for automotive deployment.
How does the guard ring construction improve reliability in real-world circuits?
The guard ring mitigates electric field crowding at the silicon die edge, suppressing premature avalanche breakdown during voltage transients like load dump (ISO 7637-2 Pulse 5a) or inductive kickback. This extends operational life in automotive and industrial environments where >100V spikes may occur across the device.
1N5818-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 30 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:
- 1 mA @ 30 V
- Capacitance @ Vr, F:
- 110pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 125°C
1N5818-B FAQ
1.How can I place an order for 1N5818-B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5818-B 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 1N5818-B reliable?
The price and inventory of 1N5818-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5818-B is usually 5 days.
3.What payment methods are accepted for 1N5818-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5818-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5818-B?
1N5818-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5818-B 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 1N5818-B?
For technical support, including 1N5818-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5818-B requirements.
6.How does Aetrix verify that 1N5818-B is sourced from the original manufacturer or authorized distributors?
All 1N5818-B 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 1N5818-B meets industry standards.
7.What is the process for return or replacement of 1N5818-B?
All 1N5818-B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5818-B, 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 1N5818-B part is unused and in its original packaging.
Return procedure for 1N5818-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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