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Diodes Incorporated 1N5819-B
- Part No.:
- 1N5819-B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5819-B.pdf
- Description:
- DIODE SCHOTTKY 40V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:8,962
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Product details
Overview
1N5819-B from Diodes Incorporated is a 1.0A, 40V Schottky barrier rectifier in DO-41 package, featuring low forward voltage drop (0.60 V @ 1.0A), high surge capability (25 A), and fast switching for DC-DC conversion, reverse polarity protection, and freewheeling applications in power supplies and automotive electronics.
For engineers reviewing the 1N5819-B datasheet, 1N5819-B pinout, 1N5819-B application, or 1N5819-B equivalent, key selection criteria include its 40V reverse blocking rating, 0.60 V forward voltage at rated current, 110 pF junction capacitance, -65°C to +125°C operating range, and DO-41 leaded package compatibility with through-hole PCB assembly.
Technical Context
This Schottky diode uses guard ring die construction to enhance transient immunity and reduce leakage under high-temperature stress. Its metal-semiconductor junction enables faster recovery than PN-junction rectifiers, eliminating minority carrier storage delay.
Designed for low-voltage, high-frequency operation, it delivers stable performance up to 100°C junction temperature with 15°C/W junction-to-lead thermal resistance and 50°C/W junction-to-ambient resistance under standard PCB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 40 V - supports DC blocking in 24V automotive and industrial power rails |
| Forward Voltage | 0.60 V @ 1.0A - reduces conduction loss by ~40% vs. comparable silicon rectifiers |
| Surge Current | 25 A (8.3ms half-sine) - withstands inrush and inductive kickback without failure |
| Junction Capacitance | 110 pF @ 4V - enables efficient operation in 100kHz–500kHz SMPS designs |
| Reverse Leakage | 1.0 mA @ 25°C, 10 mA @ 100°C - low leakage preserves efficiency in battery-critical circuits |
| Thermal Resistance | 15°C/W (Junction-to-Lead) - allows direct heat transfer to PCB copper pads for passive cooling |
Pinout & Package
DO-41 molded plastic package with axial leads; cathode identified by band marking; tin-plated leads compliant with MIL-STD-202 solderability requirements; weight ≈ 0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to lower-potential side of circuit (e.g., ground return or switch node) |
| Cathode | Current exit terminal | Marked with band; connects to higher-potential rail (e.g., input supply or inductor output) |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves ESD and transient robustness without external TVS components |
| Low forward voltage drop | Minimizes power loss in high-current 3.3V/5V/12V distribution paths |
| High surge current rating | Eliminates need for oversized derating in motor drive flyback or relay coil suppression |
| RoHS-compliant lead finish | Enables compliance with EU environmental directives without process requalification |
Applications
| DC-DC Converter Output Rectification | Automotive Reverse Polarity Protection |
|---|---|
Use Scenario: Used as secondary-side rectifier in non-isolated buck converters powering infotainment systems. IC Role / Device Role / Timing Role: Schottky rectifier conducting during low-side switch on-time; critical for minimizing conduction loss. Use Value: 0.60 V VF reduces average power dissipation by >0.4W vs. 1N4007 at 1A, lowering thermal load on PCB. | Use Scenario: Placed in series with battery feed line to block reverse connection during service. IC Role / Device Role / Timing Role: Unidirectional current gate; conducts only when battery polarity matches system design. Use Value: 40V VRRM covers 24V nominal systems with 100V load dump transients per ISO 7637-2. |
| Freewheeling Diode in Relay Drivers | Low-Voltage AC/DC Adapter Output Stage |
Use Scenario: Parallel to relay coil to clamp inductive kickback during de-energization. IC Role / Device Role / Timing Role: Fast-recovery path for stored magnetic energy; suppresses voltage spikes above 40V. Use Value: 25A IFSM handles peak coil discharge currents without degradation over 100k+ cycles. | Use Scenario: Final rectification stage in compact wall adapters delivering 5V/1A to USB peripherals. IC Role / Device Role / Timing Role: Half-wave rectifier converting transformer secondary AC to pulsating DC. Use Value: 110 pF CT limits high-frequency noise coupling into downstream LDOs or USB data lines. |
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; 40V VRRM, but 0.55V VF @ 1A and 15A IFSM | Lower forward drop improves light-load efficiency; reduced surge margin limits use in high-inductance loads | Select when optimizing for ultra-low conduction loss below 0.5A, not for repetitive surge events |
| 1N5819RL (Rectron) | Identical electrical specs and DO-41 mechanical form; RoHS-compliant, same 0.60V VF @ 1A | No functional difference; qualified for different manufacturing lots and traceability chains | Use as second-source where Diodes' supply continuity requires dual sourcing |
Compared with SB140 and 1N5819RL, the 1N5819-B offers superior surge resilience (25A vs. 15A) while matching the 40V/0.60V performance of the Rectron variant-making it optimal for automotive and industrial environments demanding both reliability and thermal stability.
Availability
1N5819-B is available at Aetrix Electronics and suitable for DC-DC converter output rectification, automotive reverse polarity protection, and freewheeling diode applications requiring stable component supply across production lifecycles.
Supply support for 1N5819-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 and manufacturing operations across Asia and the Americas.
The 1N5819-B belongs to Diodes' general-purpose Schottky rectifier product line, engineered for cost-sensitive, high-volume power management in consumer, industrial, and automotive systems where efficiency and reliability at 1A/40V are essential.
FAQ
What is the maximum junction temperature for continuous operation of the 1N5819-B?
The 1N5819-B is rated for continuous operation from -65°C to +125°C junction temperature. At ambient temperatures above 75°C, derating is required per the thermal resistance curve: RθJA = 50°C/W implies 1.0A operation is sustainable only if power dissipation remains ≤0.5W (e.g., with heatsinking or forced airflow).
Is the 1N5819-B suitable for surface-mount assembly?
No-the 1N5819-B uses the axial-leaded DO-41 package and is designed exclusively for through-hole mounting. It lacks SMD-compatible terminations or footprint geometry. For SMT equivalents, consider the SMB/SMA-packaged SB140 or SS14, which share similar electrical characteristics but require re-layout.
How does the guard ring construction improve reliability in real-world use?
The guard ring die structure mitigates edge breakdown under high dv/dt transients and reduces leakage current drift at elevated temperatures. In practice, this extends operational life in automotive environments where load dump pulses and thermal cycling exceed 1000 cycles, preventing premature parametric shift or catastrophic failure.
Can the 1N5819-B replace a 1N4007 in a 12V power supply?
Yes-but only where reverse voltage stays below 40V and fast recovery is needed. Unlike the 1N4007 (1000V, 30µs recovery), the 1N5819-B offers lower VF and zero recovery time, improving efficiency. However, its 40V rating makes it unsafe for AC line rectification; verify input voltage peaks do not exceed 40V before substitution.
1N5819-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):
- 40 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 600 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 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
1N5819-B FAQ
1.How can I place an order for 1N5819-B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5819-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 1N5819-B reliable?
The price and inventory of 1N5819-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5819-B is usually 5 days.
3.What payment methods are accepted for 1N5819-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5819-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5819-B?
1N5819-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5819-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 1N5819-B?
For technical support, including 1N5819-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5819-B requirements.
6.How does Aetrix verify that 1N5819-B is sourced from the original manufacturer or authorized distributors?
All 1N5819-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 1N5819-B meets industry standards.
7.What is the process for return or replacement of 1N5819-B?
All 1N5819-B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5819-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 1N5819-B part is unused and in its original packaging.
Return procedure for 1N5819-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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