LR645N8-G by Microchip Technology

High Input Voltage SMPS, Start-Up/Linear Regulator


LR645 is a high input voltage, low output current linear regulator. It has a 3-terminal fixed output voltage version available in TO-92, TO-220 and SOT-89 packages, as well as an adjustable voltage version available in an 8-lead SOIC package. The 3-terminal version functions like any other low voltage 3-terminal regulator except it allows the use of much higher input voltages. When used in a SMPS start-up circuit, it eliminates the need for large power resistors. In this application, current is drawn from the high voltage line only during start-up. Only leakage current flows after start-up, thereby reducing the continuous power dissipation to a few milliwatts. The adjustable voltage version allows trimming of the output voltage from 8.0 to 12V. This version can also be connected to an external depletion mode MOSFET for increased output current. When used in conjunction with depletion mode MOSFET DN2540N5, an output current of up to 150mA is achieved.

Where to Buy

Prices starting from US$0.60

Distributor Stock
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RS
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Microchip Technology
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Future Electronics
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Chip One Stop
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Newark Electronics
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Avnet America
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RS Americas
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Features

Accepts inputs from 15 to 450V
Output currents up to 3.0mA continuous, 30mA peak
Supply current typically 50µA
Line regulation typically 0.1mV/V
Output can be trimmed from 8.0 to 12V
Output current can be increased to 150mA with external FET

Specifications

+Vin min (V) 15
+Vin max (V) 450
Vout min (V) 8.0
Vout max (V) 12
Output Current (mA) 3
Dimming N/A
Parallelable N/A
Package SOT-89, TO-92, TO-220, 8-Ld SOIC
Features Trimmable Output, Higher Peak Current Capability,
Pins | Packaging 3 | SOT-89
Temp Range -55C to +150C
Packing Media Tape and reel (2000)

Environmental Information

JEDEC Indicator e3
ROHS Compliant
China EFUP Compliant
Device Weight (g) 0.0518
Shipping Weight (kg) 0.132
Lead Count 3
Package Type SOT-89
Soldering Composition Matte Tin

Alternative Descriptions

FIXED/ADJUSTABLE HIGH INPUT VOLTAGE REGULATOR | Microchip Technology
Linear Voltage Reg, 10V, 30mA, SOT-89 | RS
Linear Volt Reg, 0.003A, 10V, To-243Aa-3 | Newark Electronics
Standard Regulator Pos 10V 0.03A 4-Pin(3+Tab) SOT-89 | Avnet America
3 SOT-89 T/RFIXED/ADJUSTABLE HIGH INPUT VOLTAGE REGULATOR | Microchip Technology Inc. LR645N8-G | RS Americas
LINEAR VOLT REG, 0.003A, 10V, TO-243AA-3 | element14


Frequently Asked Questions

Where can I find additional details, specifications and documents for a LR645N8-G?

Additional datasheets, footprints and schematics for LR645N8-G are listed on our Part Details page. You can also find images and similar parts to LR645N8-G on this page.

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Is the LR645N8-G RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Microchip Technology.

Which authorised distributors for LR645N8-G have stock available?

Authorised distributors including Microchip Technology, Future Electronics, Chip One Stop, RS and Newark Electronics have stock available or on a lead time for LR645N8-G.

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