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LT1129IS8-3.3#PBF

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Analog Devices Pre-ordered Chips, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentinterface icslt1129is8-3.3#pbffactory-2.0.0extractor-text

Verified LT1129IS8-3.3#PBF

by Ray · last 30 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LT1129IS8-3.3#PBF · SO-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 16-page datasheet
  • ✓distributor: lcsc C662830, digikey LT1129IS8-3.3#PBF-ND, mouser 584-LT1129IS8-3.3PBF
  • ✓family: SOIC-8_3.9x4.9mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-lmrkbs0x/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.15)
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lt1129is8-3-3-pbf.kicad_sym✓ lt1129is8-3-3-pbf.kicad_mod✓ lt1129is8-3-3-pbf.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs lt1129is8-3-3-pbf: hero re-rendered with the chip (after the 10-30 render outage) · Ray 10d ago
viewers lt1129is8-3-3-pbf: viewers · Ray 10d ago
lt1129is8-3-3-pbf-etched.glb Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf-etched.step lt1129is8-3-3-pbf: factory component page (tier=mfr) · Ray 10d ago
lt1129is8-3-3-pbf-hero.glb lt1129is8-3-3-pbf: hero GLB from the etched model (keeps the MPN mark) · Ray 10d ago
lt1129is8-3-3-pbf-hero.overlay.json Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf.glb Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf.kicad_mod Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf.kicad_sym Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf.lbr Publish 0.1.0 · Ray 10d ago
lt1129is8-3-3-pbf.step Publish 0.1.0 · Ray 10d ago
package.json Publish 0.1.0 · Ray 10d ago
page.json Set visibility: public · Ray 10d ago
README.md Publish 0.1.0 · Ray 10d ago
verification.json Verified: Published by the parts factory: tier mfr, 8 pins · Ray 10d ago

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 (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