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LT1521CST-5#PBF
Public Made by Adomby adom
Analog Devices Linear Voltage Regulators (LDO), SOT-223. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownLT1521CST-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt1521cst-5-pbf.step/lt1521cst-5-pbf.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).