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LT1521IST-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.

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LT1521IST-5#PBF

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

LT1521IST-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 Input supply pin, with ±20V absolute maximum, that should be bypassed with 1µF to 10µF if far from the main filter capacitor and that blocks reverse current when the input is reversed.
2 GND power_in Ground pin of the ST package, electrically common with the tab.
3 OUT power_out Regulated 5V output supplying up to 300mA, requiring a minimum output capacitor of 1.5µF to prevent oscillations.

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
Input Voltage VIN -20 20 V 2
Output Pin Reverse Current 10 mA 2
Shutdown Pin Input Voltage VSHDN -0.6 6.5 V Note 1 2
Shutdown Pin Input Current 5 mA Note 1 2
Storage Temperature Range -65 150 °C 2
Operating Junction Temperature Range, Industrial TJ -40 125 °C Industrial 2
Lead Temperature 300 °C Soldering, 10 sec 2
Thermal Resistance Junction-to-Ambient θJA 50 °C/W ST package, SOT-223 2
Thermal Resistance Junction-to-Tab 20 °C/W SOT-223 11
Regulated Output Voltage VOUT 4.925 5 5.075 V LT1521-5, VIN = 5.5V, IOUT = 1mA, TJ = 25°C 3
Regulated Output Voltage VOUT 4.85 5 5.15 V LT1521-5, 6V < VIN < 20V, 1mA < IOUT < 300mA 3
Line Regulation 1.5 20 mV LT1521-5, ΔVIN = 5.5 to 20V, IOUT = 1mA 3
Load Regulation -25 -45 mV LT1521-5, ΔILOAD = 1mA to 300mA, TJ ≤ 25°C 3
Load Regulation -25 -75 mV LT1521-5, 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 3
Dropout Voltage 290 350 mV ILOAD = 50mA, TJ = 25°C 3
Dropout Voltage 450 mV ILOAD = 50mA 3
Dropout Voltage 350 420 mV ILOAD = 100mA, TJ = 25°C 3
Dropout Voltage 550 mV ILOAD = 100mA 3
Dropout Voltage 400 470 mV ILOAD = 150mA, TJ = 25°C 3
Dropout Voltage 600 mV ILOAD = 150mA 3
Dropout Voltage 500 600 mV ILOAD = 300mA, TJ = 25°C 3
Dropout Voltage 750 mV ILOAD = 300mA 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
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 IQ 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 LT1521-5, VOUT = 5V, VIN < 5V, TJ = 25°C 4

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: LT1521IST-5#PBF
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: lt1521ist-5-pbf-etched.step / lt1521ist-5-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1521ist-5-pbf.step / lt1521ist-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 2026-10-31, 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