Voltage Regulators - Switching Regulators

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LT86x Synchronous Step-Down Silent Switchers

Analog Devices LT86xx Synchronous Step-Down Regulators feature Silent Switcher^® architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN package, the monolithic construction with integrated power switches and the inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultra-low 2.5µA quiescent current enables applications requiring the highest efficiency at very small load currents. The transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

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Part #

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC#PBF
Analog Devices
1: $16.33
7,705In Stock

Mfr. Part No.
LT8640IUDC#PBF

Mouser Part No
584-LT8640IUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

7,705In Stock

$16.33

$12.82

$12.72

$10.82

$10.28

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF#PBF
Analog Devices
1: $17.95
7,103In Stock

Mfr. Part No.
LT8640JUDCF#PBF

Mouser Part No
584-LT8640JUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

7,103In Stock

$17.95

$14.50

$13.91

$12.25

Quote

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641HUDC#PBF
Analog Devices
1: $17.13
248In Stock

Mfr. Part No.
LT8641HUDC#PBF

Mouser Part No
584-LT8641HUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

248In Stock

$17.13

$13.44

$12.90

$11.34

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8641

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF#WPBF
Analog Devices
1: $18.78
189In Stock

Mfr. Part No.
LT8640JUDCF#WPBF

Mouser Part No
584-LT8640JUDCF#WPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

189In Stock

$18.78

$15.18

$14.56

$12.83

Quote

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

AEC-Q100

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDCF#PBF
Analog Devices
1: $16.11
177In Stock

Mfr. Part No.
LT8640EUDCF#PBF

Mouser Part No
584-LT8640EUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

177In Stock

$16.11

$12.64

$12.13

$10.68

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF-1#PBF
Analog Devices
1: $16.32
219In Stock

Mfr. Part No.
LT8640IUDCF-1#PBF

Mouser Part No
584-8640IUDCF-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

219In Stock

$16.32

$12.80

$12.28

$10.80

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF-1#TRPBF
Analog Devices
1: $16.32
5,879In Stock

Mfr. Part No.
LT8640IUDCF-1#TRPBF

Mouser Part No
584-8640IUDCF-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

5,879In Stock

Cut Tape

$16.32

$12.80

$12.27

$10.82

$10.28

Reel

$10.27

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF#PBF
Analog Devices
1: $17.19
75In Stock

Mfr. Part No.
LT8640IUDCF#PBF

Mouser Part No
584-LT8640IUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

75In Stock

$17.19

$13.90

$13.34

$11.73

$11.72

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDCF-1#PBF
Analog Devices
1: $15.13
89In Stock

Mfr. Part No.
LT8640EUDCF-1#PBF

Mouser Part No
584-LT8640EUDCF1PB

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

89In Stock

$15.13

$11.49

$11.04

$9.71

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 65V 3.5A Silent Switcher

LT8641ARUDCM#WPBF
Analog Devices
1: $9.33
178In Stock
New Product

Mfr. Part No.
LT8641ARUDCM#WPBF

Mouser Part No
584-LT8641ARUDCMWPBF

New Product

Analog Devices

Switching Voltage Regulators 65V 3.5A Silent Switcher

Learn More

Datasheet

178In Stock

$9.33

$6.99

$6.68

$5.79

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

3.5 A

1 Output

1.7 uA

210 kHz to 1.95 MHz

- 40 C

+ 150 C

LT8641

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC-1#TRPBF
Analog Devices
1: $16.32
2,156In Stock

Mfr. Part No.
LT8640IUDC-1#TRPBF

Mouser Part No
584-8640IUDC-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

2,156In Stock

Cut Tape

$16.32

$12.80

$12.27

$10.82

$10.28

Reel

$10.28

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

1.7 uA, 2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC#PBF
Analog Devices
1: $15.32
4,687In Stock

Mfr. Part No.
LT8640EUDC#PBF

Mouser Part No
584-LT8640EUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

4,687In Stock

$15.32

$11.63

$11.15

$9.83

$9.34

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC-1#PBF
Analog Devices
1: $15.32
2,735In Stock

Mfr. Part No.
LT8640EUDC-1#PBF

Mouser Part No
584-LT8640EUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

2,735In Stock

$15.32

$11.63

$11.15

$9.83

$9.34

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC#TRPBF
Analog Devices
1: $16.32
3,688In Stock

Mfr. Part No.
LT8640IUDC#TRPBF

Mouser Part No
584-LT8640IUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

3,688In Stock

Cut Tape

$16.32

$12.80

$12.27

$10.82

$10.28

Reel

$10.28

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641EUDC#PBF
Analog Devices
1: $15.32
5,455In Stock

Mfr. Part No.
LT8641EUDC#PBF

Mouser Part No
584-LT8641EUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

5,455In Stock

$15.32

$11.63

$11.15

$9.83

$9.34

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8641

Tube

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641IUDC#PBF
Analog Devices
1: $16.32
6,857In Stock

Mfr. Part No.
LT8641IUDC#PBF

Mouser Part No
584-LT8641IUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

6,857In Stock

$16.32

$12.80

$12.27

$10.82

$10.28

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8641

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC-1#TRPBF
Analog Devices
1: $15.32
763In Stock

Mfr. Part No.
LT8640EUDC-1#TRPBF

Mouser Part No
584-8640EUDC-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

763In Stock

Cut Tape

$15.32

$11.63

$11.15

$9.83

$9.34

Reel

$9.34

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

1.7 uA, 2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC#TRPBF
Analog Devices
1: $15.32
1,048In Stock
2,490Expected 2026/02/16

Mfr. Part No.
LT8640EUDC#TRPBF

Mouser Part No
584-LT8640EUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

1,048In Stock

2,490Expected 2026/02/16

Cut Tape

$15.32

$11.63

$11.15

$9.83

$9.34

Reel

$9.34

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC#PBF
Analog Devices
1: $17.13
438In Stock
273Expected 2026/02/23

Mfr. Part No.
LT8640HUDC#PBF

Mouser Part No
584-LT8640HUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

438In Stock

273Expected 2026/02/23

$17.13

$13.44

$12.90

$11.35

$10.80

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC#TRPBF
Analog Devices
1: $17.13
360In Stock

Mfr. Part No.
LT8640HUDC#TRPBF

Mouser Part No
584-LT8640HUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

360In Stock

Cut Tape

$17.13

$13.44

$12.90

$11.35

$10.80

Reel

$10.80

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC-1#PBF
Analog Devices
1: $16.32
645In Stock

Mfr. Part No.
LT8640IUDC-1#PBF

Mouser Part No
584-LT8640IUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

645In Stock

$16.32

$12.80

$12.27

$10.82

$10.28

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641EUDC#TRPBF
Analog Devices
1: $15.32
1,228In Stock
2,500Expected 2026/09/10

Mfr. Part No.
LT8641EUDC#TRPBF

Mouser Part No
584-LT8641EUDC#TRPBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

1,228In Stock

2,500Expected 2026/09/10

Cut Tape

$15.32

$11.63

$11.15

$9.83

$9.34

Reel

$9.34

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8641

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC-1#PBF
Analog Devices
1: $17.13
23In Stock

Mfr. Part No.
LT8640HUDC-1#PBF

Mouser Part No
584-LT8640HUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

23In Stock

$17.13

$13.44

$12.90

$11.35

$10.80

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

300 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDCF#PBF
Analog Devices
1: $20.53
52In Stock

Mfr. Part No.
LT8640HUDCF#PBF

Mouser Part No
584-LT8640HUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

52In Stock

$20.53

$16.99

$16.29

$14.35

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF-1#PBF
Analog Devices
1: $17.19
28In Stock

Mfr. Part No.
LT8640JUDCF-1#PBF

Mouser Part No
584-LT8640JUDCF-1PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

28In Stock

$17.19

$13.90

$13.33

$11.73

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

LT86x Synchronous Step-Down Silent Switchers

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