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

LT8640JUDCF-1#WPBF
Analog Devices
1: $27.84
128In Stock

Mfr. Part #
LT8640JUDCF-1#WPBF

Mouser Part #
584-LT8640JUDCF1WPBF

Analog Devices

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

Learn More

Datasheet

128In Stock

$27.84

$22.49

$21.58

$19.00

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

LT8641IUDC#TRPBF
Analog Devices
1: $25.28
2,476Expected 2026-02-16

Mfr. Part #
LT8641IUDC#TRPBF

Mouser Part #
584-LT8641IUDC#TRPBF

Analog Devices

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

Learn More

Datasheet

2,476Expected 2026-02-16

Cut Tape

$25.28

$19.84

$19.02

$16.76

$15.93

Reel

$15.93

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

LT8640EUDCF-1#TRPBF
Analog Devices
2,500: $14.31
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640EUDCF-1#TRPBF

Mouser Part #
584-LT8640EUDCF1TRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$14.31

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640EUDCF#TRPBF
Analog Devices
2,500: $15.73
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640EUDCF#TRPBF

Mouser Part #
584-LT8640EUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$15.73

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640HUDC-1#TRPBF
Analog Devices
2,500: $16.74
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640HUDC-1#TRPBF

Mouser Part #
584-LT8640HUDC1TRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$16.74

Min.: 2,500
Mult.: 2,500

Reel: 2,500

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

Reel

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

LT8640HUDCF#TRPBF
Analog Devices
2,500: $22.24
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640HUDCF#TRPBF

Mouser Part #
584-LT8640HUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$22.24

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640IUDCF#TRPBF
Analog Devices
2,500: $18.18
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640IUDCF#TRPBF

Mouser Part #
584-LT8640IUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$18.18

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF-1#TRPBF
Analog Devices
2,500: $18.18
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640JUDCF-1#TRPBF

Mouser Part #
584-LT8640JUDCF1TRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$18.18

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF-1#WTRPBF
Analog Devices
2,500: $19.00
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640JUDCF-1#WTRPBF

Mouser Part #
584-LT8640JUDCF1WTRP

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$19.00

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

AEC-Q100

LT8640

Reel

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

LT8640JUDCF#TRPBF
Analog Devices
2,500: $18.97
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640JUDCF#TRPBF

Mouser Part #
584-LT8640JUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$18.97

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF#WTRPBF
Analog Devices
2,500: $19.87
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8640JUDCF#WTRPBF

Mouser Part #
584-LT8640JUDCFWTRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$19.87

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

AEC-Q100

LT8640

Reel

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

LT8641HUDC#TRPBF
Analog Devices
1: $26.55
Non-Stocked Lead-Time 10 Weeks

Mfr. Part #
LT8641HUDC#TRPBF

Mouser Part #
584-LT8641HUDC#TRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Cut Tape

$26.55

$20.83

$19.98

$17.59

$16.74

Reel

$16.74

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

+ 150 C

LT8641

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 65V 3.5A Silent Switcher

LT8641ARUDCM#WTRPBF
Analog Devices
2,500: $7.81
Non-Stocked Lead-Time 15 Weeks
New Product

Mfr. Part #
LT8641ARUDCM#WTRPBF

Mouser Part #
584-LT864RUDCMWTRPBF

New Product

Analog Devices

Switching Voltage Regulators 65V 3.5A Silent Switcher

Learn More

Datasheet

Non-Stocked Lead-Time 15 Weeks

Reel

$7.81

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

Buck

3.5 A

1 Output

1.7 uA

210 kHz to 1.95 MHz

- 40 C

+ 150 C

LT8641

Reel

LT86x Synchronous Step-Down Silent Switchers

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