Integrated Circuits (ICs)

LR645N8-G

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Microchip Technology

LINEAR VOLTAGE REGULATORS, FIXED, 15V TO 450V IN, 10V AND 3MA OUT, TO-243AA-3

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DocumentsDatasheet LR645 Data Sheet

Integrated Circuits (ICs)

LR645N8-G

Active

Microchip Technology

LINEAR VOLTAGE REGULATORS, FIXED, 15V TO 450V IN, 10V AND 3MA OUT, TO-243AA-3

Deep-Dive with AI

DocumentsDatasheet LR645 Data Sheet

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LR645N8-G

Current - Output	3 mA
Current - Quiescent (Iq)	150 çA
Mounting Type	Surface Mount
Number of Regulators	1
Operating Temperature [Max]	155 °C
Operating Temperature [Min]	-55 °C
Output Configuration	Positive
Output Type	1.81 mOhm
Package / Case	TO-243AA
PSRR	60 dB
Supplier Device Package	TO-243AA (SOT-89)
Voltage - Input (Max) [Max]	450 V
Voltage - Output (Min/Fixed)	10 V

LR645 Series

High Input Voltage SMPS, Start-Up/Linear Regulator

Part	Mounting Type	Output Type	Output Configuration	Voltage - Output (Min/Fixed)	PSRR	Current - Output	Current - Quiescent (Iq)	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Voltage - Input (Max) [Max]	Supplier Device Package	Number of Regulators
Microchip Technology LR645N5-G	Through Hole	1.81 mOhm	Positive	10 V	60 dB	3 mA	150 çA	155 °C	-55 °C	TO-220-3	450 V	TO-220-3	1
Microchip Technology LR645N3-G-P013	Through Hole	1.81 mOhm	Positive	10 V	60 dB	3 mA	150 çA	155 °C	-55 °C	TO-226-3 TO-92-3	450 V	TO-92-3	1
Microchip Technology LR645N8-G	Surface Mount	1.81 mOhm	Positive	10 V	60 dB	3 mA	150 çA	155 °C	-55 °C	TO-243AA	450 V	TO-243AA (SOT-89)	1

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 0.83
		25	$ 0.71
		100	$ 0.63
	Digi-Reel®	1	$ 0.83
		25	$ 0.71
		100	$ 0.63
	Tape & Reel (TR)	2000	$ 0.63
Microchip Direct	T/R	1	$ 0.83
		25	$ 0.71
		100	$ 0.63
		1000	$ 0.61
		5000	$ 0.60
Newark	Each (Supplied on Cut Tape)	1	$ 0.86
		10	$ 0.80
		25	$ 0.74
		50	$ 0.70

Description

General part information

LR645 Series

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.