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LT1521CST-5#PBF

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Analog Devices Linear Voltage Regulators (LDO), SOT-223. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management icslt1521cst-5#pbffactory-2.0.0extractor-text

Verified LT1521CST-5#PBF

by Ray · last 2 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

2 Nov 2026RayPublished by the parts factory: tier mfr, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LT1521CST-5#PBF · SOT-223 · 3 pins
  • ✓copper: 4 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 16-page datasheet
  • ✓distributor: lcsc C664161, digikey LT1521CST-5#PBF-ND, mouser 584-LT1521CST-5#PBF
  • ✓family: SOT-223-3_TabPin2
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-x03izn0e/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lt1521cst-5-pbf.kicad_sym✓ lt1521cst-5-pbf.kicad_mod✓ lt1521cst-5-pbf.step
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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 4d ago
viewers lt1521cst-5-pbf: viewers · Ray 4d ago
lt1521cst-5-pbf-etched.glb Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf-etched.step lt1521cst-5-pbf: factory component page (tier=mfr) · Ray 4d ago
lt1521cst-5-pbf-hero.glb lt1521cst-5-pbf: hero GLB from the etched model (keeps the MPN mark) · Ray 4d ago
lt1521cst-5-pbf-hero.overlay.json Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf.glb Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf.kicad_mod Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf.kicad_sym Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf.lbr Publish 0.1.0 · Ray 4d ago
lt1521cst-5-pbf.step Publish 0.1.0 · Ray 4d ago
package.json Publish 0.1.0 · Ray 4d ago
page.json Set visibility: public · Ray 4d ago
README.md Publish 0.1.0 · Ray 4d ago
verification.json Verified: Published by the parts factory: tier mfr, 3 pins · Ray 4d ago

LT1521CST-5#PBF

Analog Devices · Linear Voltage Regulators (LDO) · SOT-223

LT1521CST-5#PBF from Analog Devices, in a SOT-223. 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 IN power_in Regulator input supply; withstands reverse voltages of 20V without reverse current, and a 1µF to 10µF bypass capacitor is sufficient when the source is distant or battery-powered.
2 GND power_in Ground pin, electrically common with the package tab which is also GND.
3 OUT power_out Regulated 5V output supplying up to 300mA to the load, requiring a minimum output capacitor of 1.5µF to prevent oscillation.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SOT-223
Category Power Management ICs
Pins 3

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 LT1521-5 (VIN=5.5V, IOUT=1mA, TJ=25°C) VOUT 4.925 5 5.075 V VIN = 5.5V, IOUT = 1mA, TJ = 25°C 3
Regulated Output Voltage LT1521-5 (6V<VIN<20V, 1mA<IOUT<300mA) VOUT 4.85 5 5.15 V 6V < VIN < 20V, 1mA < IOUT < 300mA, over operating temperature range 3
Line Regulation LT1521-5 1.5 20 mV ΔVIN = 5.5 to 20V, IOUT = 1mA, over operating temperature range 3
Load Regulation LT1521-5 (TJ ≤ 25°C) -25 -45 mV ΔILOAD = 1mA to 300mA, TJ ≤ 25°C 3
Load Regulation LT1521-5 (TJ > 25°C) -25 -75 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 operating temperature range 3
Dropout Voltage 290 350 mV ILOAD = 50mA, TJ = 25°C 3
Dropout Voltage 450 mV ILOAD = 50mA, over operating temperature range 3
Dropout Voltage 350 420 mV ILOAD = 100mA, TJ = 25°C 3
Dropout Voltage 550 mV ILOAD = 100mA, over operating temperature range 3
Dropout Voltage 400 470 mV ILOAD = 150mA, TJ = 25°C 3
Dropout Voltage 600 mV ILOAD = 150mA, over operating temperature range 3
Dropout Voltage 500 600 mV ILOAD = 300mA, TJ = 25°C 3
Dropout Voltage 750 mV ILOAD = 300mA, over operating temperature range 3
Ground Pin Current 12 25 µA ILOAD = 0mA, over operating temperature range 3
Ground Pin Current 65 100 µA ILOAD = 1mA, over operating temperature range 3
Ground Pin Current 300 450 µA ILOAD = 10mA, over operating temperature range 3
Ground Pin Current 0.8 1.5 mA ILOAD = 50mA, over operating temperature range 3
Ground Pin Current 1.4 2.5 mA ILOAD = 100mA, over operating temperature range 3
Ground Pin Current 2.2 4 mA ILOAD = 150mA, over operating temperature range 3
Ground Pin Current 6.5 12 mA ILOAD = 300mA, over operating temperature range 3
Shutdown Threshold (Off to On) VSHDN 1.2 2.8 V VOUT = Off to On, over operating temperature range 3
Shutdown Threshold (On to Off) VSHDN 0.25 0.75 V VOUT = On to Off, over operating temperature range 3
Shutdown Pin Current ISHDN 2 5 µA VSHDN = 0V, over operating temperature range 3
Quiescent Current in Shutdown IQ 6 12 µA VIN = VOUT(NOMINAL) + 1V, VSHDN = 0V, over operating temperature range 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, over operating temperature range 3
Input Reverse Leakage Current 1 mA VIN = -20V, VOUT = 0V, over operating temperature range 4
Reverse Output Current LT1521-5 5 10 µA VOUT = 5V, VIN < 5V, TJ = 25°C 4
Input Voltage VIN -20 20 V Absolute maximum rating ±20V (higher ratings require factory contact) 2
Output Pin Reverse Current 10 mA Absolute maximum rating 2
Shutdown Pin Input Voltage VSHDN -0.6 6.5 V Absolute maximum rating (Note 1) 2
Shutdown Pin Input Current 5 mA Absolute maximum rating (Note 1) 2
Storage Temperature Range TSTG -65 150 °C Absolute maximum rating 2
Lead Temperature (Soldering, 10 sec) 300 °C Soldering, 10 sec 2
Operating Junction Temperature Range (Commercial) TJ 0 125 °C Commercial grade (LT1521CST-5); Note 2 2
Maximum Junction Temperature TJMAX 125 °C SOT-223 (ST) package 2
Thermal Resistance Junction-to-Ambient (SOT-223 header) θJA 50 °C/W SOT-223 (ST) package, header value 2
Thermal Resistance Junction-to-Tab (SOT-223) θJ-TAB 20 °C/W SOT-223 package, junction-to-tab 11
Thermal Resistance Junction-to-Ambient (SOT-223) θJA 50 °C/W 2500mm2 topside, 2500mm2 backside, 2500mm2 board area 11
Thermal Resistance Junction-to-Ambient (SOT-223) θJA 58 °C/W 225mm2 topside, 2500mm2 backside, 2500mm2 board area 11
Thermal Resistance Junction-to-Ambient (SOT-223) θJA 64 °C/W 100mm2 topside, 2500mm2 backside, 2500mm2 board area 11
Thermal Resistance Junction-to-Ambient (SOT-223) θJA 57 °C/W 1000mm2 topside, 1000mm2 backside, 1000mm2 board area 11
Thermal Resistance Junction-to-Ambient (SOT-223) θJA 60 °C/W 1000mm2 topside, 0 backside, 1000mm2 board area 11

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: LT1521CST-5#PBF
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: lt1521cst-5-pbf-etched.step / lt1521cst-5-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1521cst-5-pbf.step / lt1521cst-5-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 2026-11-02, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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