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LT1129CST-3.3#PBF
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Analog Devices Linear Voltage Regulators (LDO), SOT-223-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LT1129CST-3.3#PBF
Analog Devices · Linear Voltage Regulators (LDO) · SOT-223-3
LT1129CST-3.3#PBF from Analog Devices, in a SOT-223-3. 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 | VIN | power_in | Input pin supplying power to the device; withstands reverse voltages (absolute maximum ±30V) and should be bypassed with 1μF to 10μF if more than 6 inches from the main input filter capacitor. |
| 2 | GND | power_in | Ground pin, also connected to the package tab (tab is GND). |
| 3 | OUTPUT | power_out | Regulated 3.3V output supplying up to 700mA to the load, which requires an output capacitor (stable with 3.3μF) to prevent oscillation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOT-223-3 |
| 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 (LT1129-3.3), VIN = 3.8V, IOUT = 1mA, TJ = 25°C | 3.25 | 3.3 | 3.35 | V | VIN = 3.8V, IOUT = 1mA, TJ = 25°C | 4 | |
| Regulated Output Voltage (LT1129-3.3), full range | 3.2 | 3.3 | 3.4 | V | 4.3V < VIN < 20V, 1mA < IOUT < 700mA, l | 4 | |
| Line Regulation (LT1129-3.3) | 1.5 | 10 | mV | ΔVIN = 4.8V to 20V, IOUT = 1mA, l | 4 | ||
| Load Regulation (LT1129-3.3), TJ = 25°C | 6 | 15 | mV | ΔILOAD = 1mA to 700mA, TJ = 25°C | 4 | ||
| Load Regulation (LT1129-3.3), full range | 20 | 30 | mV | ΔILOAD = 1mA to 700mA, l | 4 | ||
| Dropout Voltage at 10mA, TJ = 25°C | 0.13 | 0.2 | V | ILOAD = 10mA, TJ = 25°C | 4 | ||
| Dropout Voltage at 10mA, full range | 0.25 | V | ILOAD = 10mA, l | 4 | |||
| Dropout Voltage at 100mA, TJ = 25°C | 0.25 | 0.35 | V | ILOAD = 100mA, TJ = 25°C | 4 | ||
| Dropout Voltage at 100mA, full range | 0.45 | V | ILOAD = 100mA, l | 4 | |||
| Dropout Voltage at 500mA, TJ = 25°C | 0.37 | 0.45 | V | ILOAD = 500mA, TJ = 25°C | 4 | ||
| Dropout Voltage at 500mA, full range | 0.6 | V | ILOAD = 500mA, l | 4 | |||
| Dropout Voltage at 700mA, TJ = 25°C | 0.45 | 0.55 | V | ILOAD = 700mA, TJ = 25°C | 4 | ||
| Dropout Voltage at 700mA, full range | 0.7 | V | ILOAD = 700mA, l | 4 | |||
| Ground Pin Current at 0mA | 50 | 70 | μA | ILOAD = 0mA, l | 4 | ||
| Ground Pin Current at 10mA | 310 | 450 | μA | ILOAD = 10mA, l | 4 | ||
| Ground Pin Current at 100mA | 2 | 3.5 | mA | ILOAD = 100mA, l | 4 | ||
| Ground Pin Current at 300mA | 10 | 20 | mA | ILOAD = 300mA, l | 4 | ||
| Ground Pin Current at 500mA | 25 | 45 | mA | ILOAD = 500mA, l | 4 | ||
| Ground Pin Current at 700mA | 50 | 90 | mA | ILOAD = 700mA, l | 4 | ||
| Shutdown Threshold (Off to On) | 1.2 | 2.8 | V | VOUT = Off to On, l | 4 | ||
| Shutdown Threshold (On to Off) | 0.25 | 0.75 | V | VOUT = On to Off, l | 4 | ||
| Shutdown Pin Current | 6 | 10 | μA | VSHDN = 0V, l | 4 | ||
| Quiescent Current in Shutdown | 15 | 25 | μA | VIN = 6V, VSHDN = 0V, l | 4 | ||
| Ripple Rejection | 52 | 64 | dB | VIN, VOUT = 1V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.7A, TJ = 25°C | 5 | ||
| Current Limit | 1.2 | 1.6 | A | VIN, VOUT = 7V, TJ = 25°C | 5 | ||
| Input Reverse Leakage Current | 1 | mA | VIN = -20V, VOUT = 0V, l | 5 | |||
| Reverse Output Current (LT1129-3.3) | 16 | 25 | μA | VOUT = 3.3V, VIN = 0V | 5 | ||
| Input Voltage | -30 | 30 | V | Input Voltage ±30V (contact factory for higher ratings) | 2 | ||
| Output Pin Reverse Current | 10 | mA | 2 | ||||
| Sense Pin Current | 10 | mA | 2 | ||||
| Adjust Pin Current | 10 | mA | 2 | ||||
| Sense Pin, Adjust Pin Reverse Voltage | -0.6 | V | 2 | ||||
| Shutdown Pin Input Voltage | -0.6 | 6.5 | V | Note 2 | 2 | ||
| Shutdown Pin Input Current | 20 | mA | Note 2 | 2 | |||
| Storage Temperature Range | -65 | 150 | °C | 2 | |||
| Operating Junction Temperature Range (LT1129C-X) | 0 | 125 | °C | LT1129C-X | 2 | ||
| Thermal Resistance Junction-to-Ambient (ST package, 3-lead SOT-223) | θJA | 50 | °C/W | ST package, 3-lead SOT-223 | 2 | ||
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 2500 sq. mm) | 45 | °C/W | Topside copper 2500 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 | |||
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 1000 sq. mm) | 45 | °C/W | Topside copper 1000 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 | |||
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 225 sq. mm) | 53 | °C/W | Topside copper 225 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 | |||
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 100 sq. mm) | 59 | °C/W | Topside copper 100 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 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 | Table 1. Q Package, 5-Lead DD COPPER AREA THERMAL RESISTANCE | 11 |
CAD (KiCad official)
- Symbol:
LT1129CST-3.3#PBF - Footprint:
Package_TO_SOT_SMD:SOT-223-3_TabPin2 - 3D model: SOT-223-3 (KiCad packages3D, STEP)
- 3D model files:
lt1129cst-3-3-pbf-etched.step/lt1129cst-3-3-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt1129cst-3-3-pbf.step/lt1129cst-3-3-pbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (16 pp, sha256
3bd8354699849a4f, retrieved 2026-10-31, 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).
# LT1129CST-3.3#PBF
**Analog Devices** · Linear Voltage Regulators (LDO) · SOT-223-3
LT1129CST-3.3#PBF from Analog Devices, in a SOT-223-3. 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 | VIN | power_in | Input pin supplying power to the device; withstands reverse voltages (absolute maximum ±30V) and should be bypassed with 1μF to 10μF if more than 6 inches from the main input filter capacitor. |
| 2 | GND | power_in | Ground pin, also connected to the package tab (tab is GND). |
| 3 | OUTPUT | power_out | Regulated 3.3V output supplying up to 700mA to the load, which requires an output capacitor (stable with 3.3μF) to prevent oscillation. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOT-223-3 |
| 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 (LT1129-3.3), VIN = 3.8V, IOUT = 1mA, TJ = 25°C | | 3.25 | 3.3 | 3.35 | V | VIN = 3.8V, IOUT = 1mA, TJ = 25°C | 4 |
| Regulated Output Voltage (LT1129-3.3), full range | | 3.2 | 3.3 | 3.4 | V | 4.3V < VIN < 20V, 1mA < IOUT < 700mA, l | 4 |
| Line Regulation (LT1129-3.3) | | | 1.5 | 10 | mV | ΔVIN = 4.8V to 20V, IOUT = 1mA, l | 4 |
| Load Regulation (LT1129-3.3), TJ = 25°C | | | 6 | 15 | mV | ΔILOAD = 1mA to 700mA, TJ = 25°C | 4 |
| Load Regulation (LT1129-3.3), full range | | | 20 | 30 | mV | ΔILOAD = 1mA to 700mA, l | 4 |
| Dropout Voltage at 10mA, TJ = 25°C | | | 0.13 | 0.2 | V | ILOAD = 10mA, TJ = 25°C | 4 |
| Dropout Voltage at 10mA, full range | | | | 0.25 | V | ILOAD = 10mA, l | 4 |
| Dropout Voltage at 100mA, TJ = 25°C | | | 0.25 | 0.35 | V | ILOAD = 100mA, TJ = 25°C | 4 |
| Dropout Voltage at 100mA, full range | | | | 0.45 | V | ILOAD = 100mA, l | 4 |
| Dropout Voltage at 500mA, TJ = 25°C | | | 0.37 | 0.45 | V | ILOAD = 500mA, TJ = 25°C | 4 |
| Dropout Voltage at 500mA, full range | | | | 0.6 | V | ILOAD = 500mA, l | 4 |
| Dropout Voltage at 700mA, TJ = 25°C | | | 0.45 | 0.55 | V | ILOAD = 700mA, TJ = 25°C | 4 |
| Dropout Voltage at 700mA, full range | | | | 0.7 | V | ILOAD = 700mA, l | 4 |
| Ground Pin Current at 0mA | | | 50 | 70 | μA | ILOAD = 0mA, l | 4 |
| Ground Pin Current at 10mA | | | 310 | 450 | μA | ILOAD = 10mA, l | 4 |
| Ground Pin Current at 100mA | | | 2 | 3.5 | mA | ILOAD = 100mA, l | 4 |
| Ground Pin Current at 300mA | | | 10 | 20 | mA | ILOAD = 300mA, l | 4 |
| Ground Pin Current at 500mA | | | 25 | 45 | mA | ILOAD = 500mA, l | 4 |
| Ground Pin Current at 700mA | | | 50 | 90 | mA | ILOAD = 700mA, l | 4 |
| Shutdown Threshold (Off to On) | | 1.2 | | 2.8 | V | VOUT = Off to On, l | 4 |
| Shutdown Threshold (On to Off) | | 0.25 | | 0.75 | V | VOUT = On to Off, l | 4 |
| Shutdown Pin Current | | | 6 | 10 | μA | VSHDN = 0V, l | 4 |
| Quiescent Current in Shutdown | | | 15 | 25 | μA | VIN = 6V, VSHDN = 0V, l | 4 |
| Ripple Rejection | | 52 | 64 | | dB | VIN, VOUT = 1V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.7A, TJ = 25°C | 5 |
| Current Limit | | 1.2 | 1.6 | | A | VIN, VOUT = 7V, TJ = 25°C | 5 |
| Input Reverse Leakage Current | | | | 1 | mA | VIN = -20V, VOUT = 0V, l | 5 |
| Reverse Output Current (LT1129-3.3) | | | 16 | 25 | μA | VOUT = 3.3V, VIN = 0V | 5 |
| Input Voltage | | -30 | | 30 | V | Input Voltage ±30V (contact factory for higher ratings) | 2 |
| Output Pin Reverse Current | | | | 10 | mA | | 2 |
| Sense Pin Current | | | | 10 | mA | | 2 |
| Adjust Pin Current | | | | 10 | mA | | 2 |
| Sense Pin, Adjust Pin Reverse Voltage | | -0.6 | | | V | | 2 |
| Shutdown Pin Input Voltage | | -0.6 | | 6.5 | V | Note 2 | 2 |
| Shutdown Pin Input Current | | | | 20 | mA | Note 2 | 2 |
| Storage Temperature Range | | -65 | | 150 | °C | | 2 |
| Operating Junction Temperature Range (LT1129C-X) | | 0 | | 125 | °C | LT1129C-X | 2 |
| Thermal Resistance Junction-to-Ambient (ST package, 3-lead SOT-223) | θJA | | 50 | | °C/W | ST package, 3-lead SOT-223 | 2 |
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 2500 sq. mm) | | | 45 | | °C/W | Topside copper 2500 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 1000 sq. mm) | | | 45 | | °C/W | Topside copper 1000 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 225 sq. mm) | | | 53 | | °C/W | Topside copper 225 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient, SOT-223 (topside copper 100 sq. mm) | | | 59 | | °C/W | Topside copper 100 sq. mm, backside 2500 sq. mm, board 2500 sq. mm | 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 | | Table 1. Q Package, 5-Lead DD COPPER AREA THERMAL RESISTANCE | 11 |
## CAD (KiCad official)
- Symbol: `LT1129CST-3.3#PBF`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223-3 (KiCad packages3D, STEP)
- 3D model files: `lt1129cst-3-3-pbf-etched.step` / `lt1129cst-3-3-pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt1129cst-3-3-pbf.step` / `lt1129cst-3-3-pbf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/112935ff.pdf) (16 pp, sha256 `3bd8354699849a4f`, retrieved 2026-10-31, 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](docs/lt1129cst-3-3-pbf-datasheet.pdf)