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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics 1N5819UB1

Name: 1N5819UB1
Brand: STMicroelectronics
SKU: 1N5819UB1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5819UB1

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: 2-SMD, No Lead

Datasheet:: 1N5819UB1.pdf

Description:: AEROSPACE 45 V POWER SCHOTTKY RE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N5819UB1 from STMicroelectronics is an ESCC-qualified aerospace-grade Schottky diode in a hermetic LCC-2B ceramic surface-mount package, rated for 45 V repetitive peak reverse voltage, 1 A average forward current, and 150 °C maximum junction temperature. It delivers low forward voltage drop (0.49 V at 1 A, +25 °C), ultrafast switching, and radiation hardness up to 3 Mrad(Si) high dose rate - deployed in satellite power systems for secondary rectification and OR-ing.

For engineers reviewing the 1N5819UB1 datasheet, 1N5819UB1 pinout, 1N5819UB1 application, or 1N5819UB1 equivalent, key selection criteria include radiation tolerance (150 krad/Si LDR, 3 Mrad/Si HDR), hermetic LCC-2B packaging compatibility with D5B footprints, conduction loss modeling (P = 0.285×IF(AV) + 0.165×IF²(RMS)), and ESCC 5106/021 qualification status.

Technical Context

This diode uses full planar Schottky technology enabling stable operation up to 150 °C junction temperature and negligible reverse recovery charge. Its LCC-2B package features gold-plated terminations, electrically floating metallic lid, and thermal resistance R_th(j-c) = 16 °C/W - optimized for conduction-limited aerospace power stages.

It exhibits low leakage (≤20 µA at −55 °C, VR = 45 V; ≤3.5 mA at 100 °C, VR = 45 V) and low capacitance (70 pF at VR = 5 V, 1 MHz), supporting high-frequency flyback and forward converter output rectification without snubber dependency.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	45 V - defines maximum repetitive reverse blocking capability in DC motor freewheeling or polarity protection circuits
I_F(AV)	1 A at T_C ≥ 142 °C, δ = 0.5 - specifies continuous DC current handling under thermally constrained PCB mounting
V_F(max)	0.49 V at I_F = 1 A, T_j = 25 °C - enables <0.5 V conduction loss in 5 V output rectifiers, reducing thermal load
T_j(max)	150 °C - supports operation in uncooled spacecraft enclosures with ambient up to 125 °C and power derating per Figure 3
R_th(j-c)	16 °C/W - allows direct thermal coupling to metal-core PCBs or chassis for passive dissipation without heatsinks
C_j	70 pF at V_R = 5 V, 1 MHz - minimizes switching node ringing in >100 kHz SMPS designs
Radiation TID	3 Mrad(Si) HDR / 150 krad(Si) LDR - qualifies for long-duration Earth-orbit missions without parametric degradation

Pinout & Package

The 1N5819UB1 is housed in a surface-mount hermetic LCC-2B ceramic package (footprint compatible with industry-standard D5B). Dimensions: 2.23 mm × 5.40 mm × 1.82 mm (L×W×H); mass: 180 mg; gold-plated terminations; electrically floating metallic lid.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to input/source side in rectifier or freewheeling path; identified by internal metalization at two top corners and index mark
Pin 2	Cathode	Connected to output/load side; polarity critical for reverse polarity protection and OR-ing functionality

Key Features

Feature	Design Value
ESCC qualification	Complies with detail specification 5106/021 - mandatory for European Space Agency flight hardware procurement
Hermetic LCC-2B sealing	Prevents moisture ingress and outgassing in vacuum environments; eliminates conformal coating requirements
Low conduction loss	0.49 V forward drop at 1 A enables >92% efficiency in 5 V flyback secondaries at full load
Radiation hardness	Validated to 3 Mrad(Si) HDR ensures no parameter shift after 10+ years in geostationary orbit
Thermal conductivity	16 °C/W junction-to-case resistance supports >1 W dissipation on 25 mm² copper pad without forced cooling

Applications

Satellite Power Rectification

Redundancy OR-ing

Use Scenario: Secondary-side rectification in 5 V isolated flyback converters powering onboard telemetry processors.

IC Role / Device Role / Timing Role: Schottky rectifier replacing silicon diodes to minimize conduction loss and thermal stress in sealed avionics modules.

Use Value: 0.49 V forward drop reduces power loss by 45% vs. standard 1N5819, extending thermal margin in zero-convection space environment.

Use Scenario: Diode-OR configuration combining two independent 28 V bus supplies feeding critical payload subsystems.

IC Role / Device Role / Timing Role: Redundancy diode ensuring uninterrupted power during single-bus failure; leverages low V_F to minimize voltage drop across OR path.

Use Value: Sub-500 mV forward drop maintains >27.5 V at load under 1 A, preserving regulation margin for downstream DC-DC converters.

DC Motor Freewheeling

Reverse Polarity Protection

Use Scenario: Freewheeling path for brushed DC motors driving solar array actuators in low-earth orbit satellites.

IC Role / Device Role / Timing Role: Fast-recovery Schottky clamp absorbing inductive kickback during PWM turn-off; operates at >20 kHz switching frequency.

Use Value: Negligible reverse recovery time prevents voltage overshoot spikes that could damage motor drivers or induce EMI in sensitive RF payloads.

Use Scenario: Input protection for 5 V power management ICs in CubeSat command & data handling units.

IC Role / Device Role / Timing Role: Series-connected cathode-to-input diode blocking reverse connection of external battery or ground-referenced test equipment.

Use Value: 45 V V_RRM withstands transient surges during launch vibration; hermetic seal prevents corrosion-induced leakage in humid integration labs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5819U01B	Same die, ESCC 5106/021/02 flight model with serialized traceability and full ESCC qualification documentation	Required for flight hardware; includes serial numbers, diffusion lot traceability, and ESCC maintenance lot reference	Select for mission-critical subsystems where full ESCC audit trail and lot-level radiation test reports are mandated
1N5819U02B	Same die, ESCC 5106/021/03 flight model with SnPb 63/37 solder dip leads instead of gold plating	Compatible with legacy Pb-based reflow processes; slightly higher contact resistance than gold	Select when integrating into existing Pb-based assembly lines or when cost-sensitive non-mission-critical subsystems allow SnPb finish

Compared with 1N5819UB1 (engineering model), 1N5819U01B adds full ESCC flight certification traceability for orbital deployment, while 1N5819U02B trades gold plating for SnPb finish to support Pb-based reflow - both retain identical electrical and radiation performance.

Availability

1N5819UB1 is available at Aetrix Electronics and suitable for satellite power rectification, redundancy OR-ing, and DC motor freewheeling requiring stable component supply across extended development cycles and low-volume production runs.

Supply support for 1N5819UB1 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 aerospace-grade components for industrial, automotive, and space applications.

The 1N5819U series belongs to ST's ESCC-qualified radiation-hardened discrete portfolio, engineered specifically for high-reliability power conversion in low-Earth and geostationary orbit missions.

FAQ

Is the 1N5819UB1 suitable for use in flight hardware?

No - the 1N5819UB1 is an engineering model qualified to ESCC 5106/021 but lacking full flight certification documentation. For flight hardware, ST specifies 1N5819U01B (gold-plated, ESCC 5106/021/02) or 1N5819U02B (SnPb-plated, ESCC 5106/021/03), which include serialized traceability, diffusion lot records, and ESCC maintenance lot validation.

What is the thermal resistance from junction to case (R_th(j-c)) for the LCC-2B package?

The junction-to-case thermal resistance is 16 °C/W, measured under standard test conditions per DS6395 Rev 7. This value assumes direct thermal contact between the package base and a copper plane; actual system-level R_th(j-a) depends on PCB copper area, layer count, and airflow - Figure 3 provides derating curves for ambient temperature.

How does the radiation hardness of 1N5819UB1 compare to commercial Schottky diodes?

1N5819UB1 is characterized to 3 Mrad(Si) high dose rate and 150 krad(Si) low dose rate - exceeding ECSS-Q-ST-60-15C1 requirements by 10×. Commercial Schottky diodes typically fail above 10–50 krad(Si) due to interface trap buildup; this device maintains V_F and I_R stability post-irradiation per ESCC 22900 testing protocol.

Can the metallic lid of the LCC-2B package be grounded?

Yes - the metallic lid is electrically floating and not internally connected to any pin. Grounding it has no effect on electrical characteristics, but doing so may improve EMI shielding in high-frequency power stages. ST confirms no performance impact whether grounded or left floating, as verified in radiation and thermal characterization tests.

1N5819UB1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 2-SMD, No Lead

Packaging:: Tray

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 450 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 20 µA @ 45 V

Capacitance @ Vr, F:: 70pF @ 5V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 2-LCCB

Operating Temperature - Junction:: 150°C

1N5819UB1 FAQ

1.How can I place an order for 1N5819UB1 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5819UB1 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 1N5819UB1 reliable?

The price and inventory of 1N5819UB1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5819UB1 is usually 5 days.

3.What payment methods are accepted for 1N5819UB1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5819UB1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5819UB1?

1N5819UB1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5819UB1 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 1N5819UB1?

For technical support, including 1N5819UB1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5819UB1 requirements.

6.How does Aetrix verify that 1N5819UB1 is sourced from the original manufacturer or authorized distributors?

All 1N5819UB1 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 1N5819UB1 meets industry standards.

7.What is the process for return or replacement of 1N5819UB1?

All 1N5819UB1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5819UB1, 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 1N5819UB1 part is unused and in its original packaging.

Return procedure for 1N5819UB1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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