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STMicroelectronics 1N5819
- Part No.:
- 1N5819
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5819.pdf
- Description:
- SCHOTTKY DO15 40V 1A 150C
- Quantity:
- Payment:
- Shipping:
Inventory:3,823
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Product details
Overview
1N5819 from STMicroelectronics is a low-drop, axial-lead Schottky rectifier diode rated for 1 A average forward current and 40 V repetitive peak reverse voltage, with a maximum forward voltage drop of 0.55 V at 1 A and 25 °C. It features negligible switching losses, extremely fast recovery, and specified avalanche capability - deployed in high-frequency DC/DC converters, SMPS output rectification, and battery charger polarity protection.
For engineers reviewing the 1N5819 datasheet, 1N5819 pinout, 1N5819 application, or 1N5819 equivalent, key selection criteria include its DO-41 package thermal resistance (Rth(j-a) = 100 °C/W), surge current rating (25 A, 10 ms), junction temperature limit (150 °C), and low-conduction-loss profile optimized for low-voltage, high-efficiency power stages.
Technical Context
The 1N5819 operates as a unidirectional power rectifier leveraging a metal–semiconductor Schottky barrier, enabling near-zero reverse recovery time and eliminating minority-carrier storage delay. Its conduction loss model is defined by P = 0.3 × IF(AV) + 0.150 × IF(RMS)², distinguishing it from the 1N5817/1N5818 variants.
Avalanche energy handling is characterized with PARM = 900 W (1 µs pulse, Tj = 25 °C), and dV/dt immunity reaches 10,000 V/µs - critical for snubberless operation in flyback and boost topologies where rapid voltage transients occur across the device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A - continuous DC output current capability at TL = 125 °C with 50% duty cycle, defining usable steady-state power delivery in compact SMPS designs. |
| VRRM | 40 V - maximum repetitive reverse blocking voltage, setting upper limit for input/output voltage rails in 24 V and 36 V systems. |
| VF (max) | 0.55 V @ 1 A, 25 °C - low forward drop reduces conduction loss by ~30% vs. comparable PN-junction rectifiers, directly improving efficiency in low-VOUT converters. |
| IFSM | 25 A @ 10 ms sine half-cycle - surge rating supports inrush current handling during startup or transient overload without failure. |
| Tj(max) | 150 °C - maximum junction temperature, constraining thermal design margin when mounted on PCB without heatsink. |
| Rth(j-a) | 100 °C/W (lead length = 10 mm) - quantifies self-heating under ambient conditions; dictates minimum copper area and airflow for thermal compliance. |
| Cj | ~100 pF @ 4 V - junction capacitance impacts high-frequency switching noise and EMI filter sizing in >100 kHz applications. |
Pinout & Package
Package: DO-41 axial-leaded plastic package per Table 5 (A = 4.07–5.20 mm, B = 2.04–2.71 mm, D = 0.71–0.86 mm), cathode indicated by band. UL94 V0-compliant epoxy encapsulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry point | Connected to lower-potential side (e.g., switch node in buck converter); must withstand surge current and thermal cycling. |
| Cathode (banded end) | Forward current exit / reverse voltage blocking terminal | Connected to output rail or ground return; polarity marking prevents reverse-bias misconnection in series/parallel arrays. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | VF ≤ 0.55 V @ 1 A enables ≥2% efficiency gain over standard silicon rectifiers in 3.3–12 V output stages. |
| Extremely fast switching | No reverse recovery charge (Qrr ≈ 0) eliminates switching loss spikes and associated EMI in >200 kHz converters. |
| Avalanche-rated capability | PARM = 900 W (1 µs) allows safe clamping of inductive kickback without external TVS in cost-sensitive flyback snubber circuits. |
| Negligible conduction losses | Conduction loss modeled as P = 0.3×IF(AV) + 0.150×IF(RMS)² - enables accurate thermal prediction without iterative simulation. |
Applications
| SMPS Output Rectification | Battery Charger Polarity Protection |
|---|---|
Use Scenario: Used as secondary-side rectifier in isolated DC/DC converters delivering 3.3–12 V at up to 1 A. IC Role / Device Role / Timing Role: Unidirectional power transfer element converting transformer AC output to regulated DC, operating continuously at switching frequencies ≥100 kHz. Use Value: 0.55 V VF minimizes conduction loss and thermal rise on PCB, reducing need for thermal relief pads or forced air cooling. | Use Scenario: Placed in series with battery input to prevent damage from reversed battery insertion in portable medical or IoT devices. IC Role / Device Role / Timing Role: Passive polarity guard - conducts only when battery anode connects to circuit anode, blocking reverse current flow under misconnection. Use Value: Low VF avoids significant voltage drop in normal operation, preserving battery runtime while providing fail-safe protection without active control. |
| High-Frequency Inverter Free-Wheeling | Low-Voltage DC Power Rail Clamping |
Use Scenario: Mounted across inductive loads (e.g., solenoids, relay coils) in 24 V automotive body-control modules. IC Role / Device Role / Timing Role: Freewheeling path for stored inductor energy during MOSFET turn-off, conducting for microseconds with minimal voltage overshoot. Use Value: Near-zero reverse recovery eliminates voltage ringing and EMI, allowing smaller snubber components and tighter layout in space-constrained ECUs. | Use Scenario: Connected between 5 V logic rail and ground to clamp transient overvoltage from ESD or inductive coupling in industrial sensor nodes. IC Role / Device Role / Timing Role: Avalanche-clamping element absorbing short-duration energy pulses (<1 µs) without breakdown or parameter shift. Use Value: Rated 900 W avalanche power enables single-device transient suppression, avoiding dedicated TVS diodes and saving board area and BOM count. |
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, 40 V VRRM, but VF = 0.5 V @ 1 A (slightly lower), IFSM = 30 A (higher). | Higher surge rating suits intermittent load switching; identical thermal profile allows direct PCB footprint reuse. | Select when higher inrush tolerance is required without changing layout or thermal design. |
| 1N5819RL (STMicroelectronics) | Identical electrical specs, but supplied in tape-and-reel (5000 pcs) vs. ammopack (2000 pcs); same DO-41 mechanical form. | Optimized for automated SMT placement lines requiring reel-fed feeders, not manual or semi-automated assembly. | Choose for high-volume production with pick-and-place equipment; no electrical or thermal trade-offs. |
Compared with SB140 and 1N5819RL, the base 1N5819 offers optimal balance of cost, availability, and proven reliability in low-volume prototyping and medium-run industrial power supplies - especially where manual assembly or mixed-BOM procurement is used.
Availability
1N5819 is available at Aetrix Electronics and suitable for SMPS output rectification, battery charger polarity protection, high-frequency inverter freewheeling, and low-voltage DC rail clamping requiring stable component supply across design-in, NPI, and production phases.
Supply support for 1N5819 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 industrial, automotive, and consumer markets.
The 1N5819 belongs to ST's legacy axial-leaded Schottky rectifier product line, engineered specifically for cost-sensitive, high-efficiency low-voltage power conversion in non-automotive industrial and consumer power supplies.
FAQ
Is the 1N5819 suitable for automotive applications?
No - the 1N5819 is not qualified to AEC-Q101 and lacks automotive-grade screening, temperature cycling validation, or PPAP documentation. ST explicitly states non-automotive-grade parts carry no warranty for use in vehicles. For automotive use, consider ST's AEC-Q101-certified equivalents like STPS1L40.
What is the maximum allowable PCB trace width for thermal relief with 1N5819?
Per ST's recommended pad layout in Doc ID 6262 Rev 5, a minimum 35 mm copper pour (epoxy PCB) is advised for Rth(j-a) = 100 °C/W. For 1 A continuous current, 1.5 mm wide × 20 mm long traces with 2 oz copper reduce thermal resistance by ~15%, but full thermal modeling is required for >70 °C ambient operation.
Does the 1N5819 have a specified reverse recovery time (trr)?
No - Schottky diodes like the 1N5819 operate via majority-carrier conduction and exhibit no measurable reverse recovery time. ST specifies "extremely fast switching" and "negligible switching losses" in lieu of trr; measured reverse recovery charge Qrr is effectively zero, confirmed by absence of trr in all parametric tables.
Can multiple 1N5819 diodes be paralleled for higher current?
Not recommended without individual current-sharing resistors. Forward voltage mismatch (±0.05 V across lots) causes uneven current distribution - one diode may carry >70% of total current at 2 A, risking thermal runaway. For >1 A, select a single higher-rated part such as STPS2H100 (2 A, 100 V) in DO-41.
1N5819 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 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:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- 150°C (Max)
1N5819 FAQ
1.How can I place an order for 1N5819 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5819 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 reliable?
The price and inventory of 1N5819 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5819 is usually 5 days.
3.What payment methods are accepted for 1N5819?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5819 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5819?
1N5819 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5819 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?
For technical support, including 1N5819 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5819 requirements.
6.How does Aetrix verify that 1N5819 is sourced from the original manufacturer or authorized distributors?
All 1N5819 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 meets industry standards.
7.What is the process for return or replacement of 1N5819?
All 1N5819 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5819, 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 part is unused and in its original packaging.
Return procedure for 1N5819:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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