component
LT1129IS8-3.3#PBF
Public Made by Adomby adom
Analog Devices Pre-ordered Chips, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LT1129IS8-3.3#PBF
Analog Devices · Pre-ordered Chips · SO-8
LT1129IS8-3.3#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 | OUTPUT | power_out | The output pin supplies power to the load and requires an output capacitor to prevent oscillations; the output pin reverse current is rated at 10mA maximum. |
| 2 | SENSE | input | For the LT1129-3.3 fixed-voltage version this is the error amplifier input, optimum regulation is obtained when connected to the output pin, and it is internally clamped to -0.6V (one VBE) with a sense pin bias current of 15μA. |
| 3 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 4 | NC | unconnected | No connection; this pin is marked NC on the S8 pin configuration. |
| 5 | SHDN | input | Active-low shutdown pin that turns the output off when pulled low, is internally clamped to 7V and -0.6V, draws 6μA when pulled to ground, can be left open to keep the output on, and pull-up current must be limited to a maximum of 20mA. |
| 6 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 7 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 8 | VIN | power_in | Input supply pin that withstands reverse voltages with respect to ground and the output pin, with an absolute maximum input voltage of ±30V and a recommended 1μF to 10μF bypass capacitor when more than 6 inches from the input filter capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SO-8 |
| Category | Interface 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 (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 temperature range) | 3.2 | 3.3 | 3.4 | V | 4.3V < VIN < 20V, 1mA < IOUT < 700mA, over operating junction temperature range (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) | 6 | 15 | mV | ΔILOAD = 1mA to 700mA, TJ = 25°C | 4 | ||
| Load Regulation (LT1129-3.3, full temperature range) | 20 | 30 | mV | ΔILOAD = 1mA to 700mA (l) | 4 | ||
| Dropout Voltage | 0.13 | 0.2 | V | ILOAD = 10mA, TJ = 25°C | 4 | ||
| Dropout Voltage | 0.25 | V | ILOAD = 10mA (l) | 4 | |||
| Dropout Voltage | 0.25 | 0.35 | V | ILOAD = 100mA, TJ = 25°C | 4 | ||
| Dropout Voltage | 0.45 | V | ILOAD = 100mA (l) | 4 | |||
| Dropout Voltage | 0.37 | 0.45 | V | ILOAD = 500mA, TJ = 25°C | 4 | ||
| Dropout Voltage | 0.6 | V | ILOAD = 500mA (l) | 4 | |||
| Dropout Voltage | 0.45 | 0.55 | V | ILOAD = 700mA, TJ = 25°C | 4 | ||
| Dropout Voltage | 0.7 | V | ILOAD = 700mA (l) | 4 | |||
| Ground Pin Current | 50 | 70 | μA | ILOAD = 0mA (l) | 4 | ||
| Ground Pin Current | 310 | 450 | μA | ILOAD = 10mA (l) | 4 | ||
| Ground Pin Current | 2 | 3.5 | mA | ILOAD = 100mA (l) | 4 | ||
| Ground Pin Current | 10 | 20 | mA | ILOAD = 300mA (l) | 4 | ||
| Ground Pin Current | 25 | 45 | mA | ILOAD = 500mA (l) | 4 | ||
| Ground Pin Current | 50 | 90 | mA | ILOAD = 700mA (l) | 4 | ||
| Shutdown Threshold (Off to On) | 0.25 | 1.2 | V | VOUT = Off to On (l) | 4 | ||
| Shutdown Threshold (On to Off) | 0.75 | 2.8 | 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 (Absolute Maximum) | -30 | 30 | V | ±30V; contact factory for higher input voltage ratings | 2 | ||
| Output Pin Reverse Current | 10 | mA | 2 | ||||
| Sense Pin Current | 10 | mA | 2 | ||||
| Sense Pin Reverse Voltage | -0.6 | V | Sense pin reverse voltage (printed jointly with adjust pin) | 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 | -40 | 125 | °C | LT1129I-X (Note 12) | 2 | ||
| Output Capacitor (recommended minimum) | COUT | 3.3 | μF | Stability; minimum recommended value | 11 | ||
| Output Capacitor ESR | ESR | 2 | Ω | With minimum 3.3μF output capacitor | 11 | ||
| Input Bypass Capacitor | CIN | 1 | 10 | μF | Battery-powered circuits; sufficient bypass range | 9 | |
| Thermal Resistance Junction-to-Ambient (S8 package) | θJA | 60 | °C/W | S8 8-lead plastic SO, as printed in pin configuration | 2 | ||
| Thermal Resistance Junction-to-Ambient (S8, 2500 mm² topside copper) | θJA | 55 | °C/W | Topside 2500 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 | ||
| Thermal Resistance Junction-to-Ambient (S8, 1000 mm² topside copper) | θJA | 55 | °C/W | Topside 1000 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 | ||
| Thermal Resistance Junction-to-Ambient (S8, 225 mm² topside copper) | θJA | 63 | °C/W | Topside 225 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 | ||
| Thermal Resistance Junction-to-Ambient (S8, 100 mm² topside copper) | θJA | 69 | °C/W | Topside 100 sq. mm, backside 2500 sq. mm, board area 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:
LT1129IS8-3.3#PBF - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
lt1129is8-3-3-pbf-etched.step/lt1129is8-3-3-pbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lt1129is8-3-3-pbf.step/lt1129is8-3-3-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 2026-10-30, 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).
# LT1129IS8-3.3#PBF
**Analog Devices** · Pre-ordered Chips · SO-8
LT1129IS8-3.3#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 | OUTPUT | power_out | The output pin supplies power to the load and requires an output capacitor to prevent oscillations; the output pin reverse current is rated at 10mA maximum. |
| 2 | SENSE | input | For the LT1129-3.3 fixed-voltage version this is the error amplifier input, optimum regulation is obtained when connected to the output pin, and it is internally clamped to -0.6V (one VBE) with a sense pin bias current of 15μA. |
| 3 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 4 | NC | unconnected | No connection; this pin is marked NC on the S8 pin configuration. |
| 5 | SHDN | input | Active-low shutdown pin that turns the output off when pulled low, is internally clamped to 7V and -0.6V, draws 6μA when pulled to ground, can be left open to keep the output on, and pull-up current must be limited to a maximum of 20mA. |
| 6 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 7 | GND | power_in | Ground pin; all ground pins are internally connected. |
| 8 | VIN | power_in | Input supply pin that withstands reverse voltages with respect to ground and the output pin, with an absolute maximum input voltage of ±30V and a recommended 1μF to 10μF bypass capacitor when more than 6 inches from the input filter capacitor. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SO-8 |
| Category | Interface 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 (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 temperature range) | | 3.2 | 3.3 | 3.4 | V | 4.3V < VIN < 20V, 1mA < IOUT < 700mA, over operating junction temperature range (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) | | | 6 | 15 | mV | ΔILOAD = 1mA to 700mA, TJ = 25°C | 4 |
| Load Regulation (LT1129-3.3, full temperature range) | | | 20 | 30 | mV | ΔILOAD = 1mA to 700mA (l) | 4 |
| Dropout Voltage | | | 0.13 | 0.2 | V | ILOAD = 10mA, TJ = 25°C | 4 |
| Dropout Voltage | | | | 0.25 | V | ILOAD = 10mA (l) | 4 |
| Dropout Voltage | | | 0.25 | 0.35 | V | ILOAD = 100mA, TJ = 25°C | 4 |
| Dropout Voltage | | | | 0.45 | V | ILOAD = 100mA (l) | 4 |
| Dropout Voltage | | | 0.37 | 0.45 | V | ILOAD = 500mA, TJ = 25°C | 4 |
| Dropout Voltage | | | | 0.6 | V | ILOAD = 500mA (l) | 4 |
| Dropout Voltage | | | 0.45 | 0.55 | V | ILOAD = 700mA, TJ = 25°C | 4 |
| Dropout Voltage | | | | 0.7 | V | ILOAD = 700mA (l) | 4 |
| Ground Pin Current | | | 50 | 70 | μA | ILOAD = 0mA (l) | 4 |
| Ground Pin Current | | | 310 | 450 | μA | ILOAD = 10mA (l) | 4 |
| Ground Pin Current | | | 2 | 3.5 | mA | ILOAD = 100mA (l) | 4 |
| Ground Pin Current | | | 10 | 20 | mA | ILOAD = 300mA (l) | 4 |
| Ground Pin Current | | | 25 | 45 | mA | ILOAD = 500mA (l) | 4 |
| Ground Pin Current | | | 50 | 90 | mA | ILOAD = 700mA (l) | 4 |
| Shutdown Threshold (Off to On) | | 0.25 | | 1.2 | V | VOUT = Off to On (l) | 4 |
| Shutdown Threshold (On to Off) | | 0.75 | | 2.8 | 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 (Absolute Maximum) | | -30 | | 30 | V | ±30V; contact factory for higher input voltage ratings | 2 |
| Output Pin Reverse Current | | | | 10 | mA | | 2 |
| Sense Pin Current | | | | 10 | mA | | 2 |
| Sense Pin Reverse Voltage | | -0.6 | | | V | Sense pin reverse voltage (printed jointly with adjust pin) | 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 | | -40 | | 125 | °C | LT1129I-X (Note 12) | 2 |
| Output Capacitor (recommended minimum) | COUT | 3.3 | | | μF | Stability; minimum recommended value | 11 |
| Output Capacitor ESR | ESR | | | 2 | Ω | With minimum 3.3μF output capacitor | 11 |
| Input Bypass Capacitor | CIN | 1 | | 10 | μF | Battery-powered circuits; sufficient bypass range | 9 |
| Thermal Resistance Junction-to-Ambient (S8 package) | θJA | | 60 | | °C/W | S8 8-lead plastic SO, as printed in pin configuration | 2 |
| Thermal Resistance Junction-to-Ambient (S8, 2500 mm² topside copper) | θJA | | 55 | | °C/W | Topside 2500 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient (S8, 1000 mm² topside copper) | θJA | | 55 | | °C/W | Topside 1000 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient (S8, 225 mm² topside copper) | θJA | | 63 | | °C/W | Topside 225 sq. mm, backside 2500 sq. mm, board area 2500 sq. mm | 11 |
| Thermal Resistance Junction-to-Ambient (S8, 100 mm² topside copper) | θJA | | 69 | | °C/W | Topside 100 sq. mm, backside 2500 sq. mm, board area 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: `LT1129IS8-3.3#PBF`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `lt1129is8-3-3-pbf-etched.step` / `lt1129is8-3-3-pbf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lt1129is8-3-3-pbf.step` / `lt1129is8-3-3-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 2026-10-30, 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/lt1129is8-3-3-pbf-datasheet.pdf)