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LT1521CS8#PBF

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Analog Devices Linear Voltage Regulators (LDO), SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management icslt1521cs8#pbffactory-2.0.0extractor-text

Verified LT1521CS8#PBF

by Ray · last 31 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

31 Oct 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LT1521CS8#PBF · SO-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 16-page datasheet
  • ✓distributor: lcsc C664149, digikey LT1521CS8#PBF-ND, mouser 584-LT1521CS8#PBF
  • ✓family: SOIC-8_3.9x4.9mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-i4048cvn/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.14)
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lt1521cs8-pbf.kicad_sym✓ lt1521cs8-pbf.kicad_mod✓ lt1521cs8-pbf.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 7d ago
viewers lt1521cs8-pbf: viewers · Ray 7d ago
lt1521cs8-pbf-etched.glb Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf-etched.step lt1521cs8-pbf: factory component page (tier=mfr) · Ray 7d ago
lt1521cs8-pbf-hero.glb lt1521cs8-pbf: hero GLB from the etched model (keeps the MPN mark) · Ray 7d ago
lt1521cs8-pbf-hero.overlay.json Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf.glb Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf.kicad_mod Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf.kicad_sym Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf.lbr Publish 0.1.0 · Ray 7d ago
lt1521cs8-pbf.step Publish 0.1.0 · Ray 7d ago
package.json Publish 0.1.0 · Ray 7d ago
page.json Set visibility: public · Ray 7d ago
README.md Publish 0.1.0 · Ray 7d ago
verification.json Verified: Published by the parts factory: tier mfr, 8 pins · Ray 7d ago

LT1521CS8#PBF

Analog Devices · Linear Voltage Regulators (LDO) · SO-8

LT1521CS8#PBF from Analog Devices, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 OUT power_out Regulated output supplying the load, requiring a minimum 1.5µF output capacitor to prevent oscillation.
2 ADJ input Error-amplifier input on the adjustable LT1521 with 3.75V reference, 50nA bias current into the pin, internally clamped to 6V and -0.6V, giving a 3.75V to 20V output range (pin 2 is SENSE on the fixed -3/-3.3/-5 versions).
3 GND power_in Ground pin, one of pins 3, 6 and 7 that are ground on the S8 package.
4 NC unconnected No internal connection.
5 SHDN input Active-low shutdown input, pulled low to turn the output off, internally clamped to 7V and -0.6V, may be left open for output on (on above 2.80V max, off below 0.25V min threshold, pull-up current limited to 5mA).
6 GND power_in Ground pin, one of pins 3, 6 and 7 that are ground on the S8 package.
7 GND power_in Ground pin, one of pins 3, 6 and 7 that are ground on the S8 package.
8 IN power_in Power input, withstands reverse voltage of 20V with no reverse current flow, and should be bypassed with 1µF to 10µF if far from the main input filter capacitor.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SO-8
Category Power Management ICs
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Regulated Output Voltage (Adjust pin tied to output) VOUT 3.695 3.75 3.805 V VIN = 4.3V, IOUT = 1mA, TJ = 25°C 3
Regulated Output Voltage (Adjust pin tied to output) VOUT 3.64 3.75 3.86 V 4.8V < VIN < 20V, 1mA < IOUT < 300mA, over temperature 3
Line Regulation 1.5 20 mV ΔVIN = 4.3 to 20V, IOUT = 1mA 3
Load Regulation (TJ ≤ 25°C) -20 -30 mV ΔILOAD = 1mA to 300mA, TJ ≤ 25°C 3
Load Regulation (TJ > 25°C) -20 -55 mV ΔILOAD = 1mA to 300mA, TJ > 25°C 3
Dropout Voltage 130 170 mV ILOAD = 1mA, TJ = 25°C 3
Dropout Voltage 250 mV ILOAD = 1mA, over temperature 3
Dropout Voltage 290 350 mV ILOAD = 50mA, TJ = 25°C 3
Dropout Voltage 450 mV ILOAD = 50mA, over temperature 3
Dropout Voltage 350 420 mV ILOAD = 100mA, TJ = 25°C 3
Dropout Voltage 550 mV ILOAD = 100mA, over temperature 3
Dropout Voltage 400 470 mV ILOAD = 150mA, TJ = 25°C 3
Dropout Voltage 600 mV ILOAD = 150mA, over temperature 3
Dropout Voltage 500 600 mV ILOAD = 300mA, TJ = 25°C 3
Dropout Voltage 750 mV ILOAD = 300mA, over temperature 3
Ground Pin Current 12 25 µA ILOAD = 0mA 3
Ground Pin Current 65 100 µA ILOAD = 1mA 3
Ground Pin Current 300 450 µA ILOAD = 10mA 3
Ground Pin Current 0.8 1.5 mA ILOAD = 50mA 3
Ground Pin Current 1.4 2.5 mA ILOAD = 100mA 3
Ground Pin Current 2.2 4 mA ILOAD = 150mA 3
Ground Pin Current 6.5 12 mA ILOAD = 300mA 3
Adjust Pin Bias Current 50 100 nA TJ = 25°C 3
Shutdown Threshold (Off to On) 1.2 2.8 V VOUT = Off to On 3
Shutdown Threshold (On to Off) 0.25 0.75 V VOUT = On to Off 3
Shutdown Pin Current 2 5 µA VSHDN = 0V 3
Quiescent Current in Shutdown 6 12 µA VIN = VOUT (NOMINAL) + 1V, VSHDN = 0V 3
Ripple Rejection 50 58 dB VIN, VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 150mA 3
Current Limit 400 800 mA VIN, VOUT = 7V, TJ = 25°C 3
Current Limit 320 400 mA VIN = VOUT (NOMINAL) + 1.5V, ΔVOUT =, 0.1V 3
Input Reverse Leakage Current 1 mA VIN =, 20V, VOUT = 0V 4
Reverse Output Current 5 10 µA VOUT = 3.8V, VIN < 3.75V, TJ = 25°C 4
Input Voltage -20 20 V 2
Output Pin Reverse Current 10 mA 2
Adjust Pin Current 10 mA 2
Shutdown Pin Input Voltage -0.6 6.5 V 2
Shutdown Pin Input Current 5 mA 2
Storage Temperature Range -65 150 °C 2
Operating Junction Temperature Range (Commercial) 0 125 °C Commercial 2
Lead Temperature (Soldering, 10 sec) 300 °C 2
Maximum Junction Temperature TJMAX 125 °C S8 package 2
Thermal Resistance Junction-to-Ambient θJA 70 °C/W S8 package 2
Thermal Resistance Junction-to-Ambient 60 °C/W S8, topside 2500mm2, backside 2500mm2, board 2500mm2 10
Thermal Resistance Junction-to-Ambient 68 °C/W S8, topside 225mm2, backside 2500mm2, board 2500mm2 10
Thermal Resistance Junction-to-Ambient 74 °C/W S8, topside 100mm2, backside 2500mm2, board 2500mm2 10

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper 3/32" FR-4 board with one ounce copper. All NC leads were 10

CAD (KiCad official)

  • Symbol: LT1521CS8#PBF
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SO-8 (KiCad packages3D, STEP)
  • 3D model files: lt1521cs8-pbf-etched.step / lt1521cs8-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1521cs8-pbf.step / lt1521cs8-pbf.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (16 pp, sha256 a580c39ec72785d9, retrieved 2026-10-31, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF