component

LM340T-12

Public Made by Adom

by adom

Texas Instruments Linear Voltage Regulators (LDO), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management icslm340t-12factory-2.0.0extractor-text

Verified LM340T-12

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, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LM340T-12 · TO-220 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 34-page datasheet
  • ✓distributor: lcsc C139404, digikey LM340T-12-ND, mouser 926-LM340T-12
  • ✓family: TO-220-3_Vertical
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-rixgzu_3/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lm340t-12.kicad_sym✓ lm340t-12.kicad_mod✓ lm340t-12.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 8d ago
viewers lm340t-12: viewers · Ray 8d ago
lm340t-12-etched.glb Publish 0.1.0 · Ray 8d ago
lm340t-12-etched.step lm340t-12: factory component page (tier=mfr) · Ray 8d ago
lm340t-12-hero.glb lm340t-12: hero GLB from the etched model (keeps the MPN mark) · Ray 8d ago
lm340t-12-hero.overlay.json Publish 0.1.0 · Ray 8d ago
lm340t-12.glb Publish 0.1.0 · Ray 8d ago
lm340t-12.kicad_mod Publish 0.1.0 · Ray 8d ago
lm340t-12.kicad_sym Publish 0.1.0 · Ray 8d ago
lm340t-12.lbr Publish 0.1.0 · Ray 8d ago
lm340t-12.step Publish 0.1.0 · Ray 8d ago
package.json Publish 0.1.0 · Ray 8d ago
page.json Set visibility: public · Ray 8d ago
README.md Publish 0.1.0 · Ray 8d ago
verification.json Verified: Published by the parts factory: tier mfr, 3 pins · Ray 8d ago

LM340T-12

Texas Instruments · Linear Voltage Regulators (LDO) · TO-220

LM340T-12 from Texas Instruments, in a TO-220. 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 INPUT input Input voltage pin of the regulator; the datasheet gives a DC input voltage absolute maximum of 35 V.
2 GND power_in Ground pin, which is the common return for the regulator.
3 OUTPUT output Regulated output voltage pin (fixed 12 V for the LM340T-12).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TO-220
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
DC input voltage 35 V 4
Maximum junction temperature 150 °C 4
Storage temperature -65 150 °C 4
Lead temperature (soldering) 230 °C 1,6 mm (1/16 in) from case for 10 s 4
Temperature (TA) TA 0 125 °C LM340A, LM340 4
Output voltage VO 11.5 12 12.5 V TJ = 25°C, 5 mA ≤ IO ≤ 1 A 7
Output voltage VO 11.4 12.6 V PD ≤ 15 W, 5 mA ≤ IO ≤ 1 A, 14.5 V ≤ VIN ≤ 27 V 7
Line regulation ΔVO 4 120 mV IO = 500 mA, TJ = 25°C, 14.5 V ≤ VIN ≤ 30 V 7
Line regulation ΔVO 120 mV IO = 500 mA, over temperature, 15 V ≤ VIN ≤ 27 V 7
Line regulation ΔVO 60 mV IO ≤ 1 A, over temperature, 16 V ≤ VIN ≤ 22 V 7
Load regulation ΔVO 12 120 mV TJ = 25°C, 5 mA ≤ IO ≤ 1.5 A 7
Load regulation ΔVO 60 mV 250 mA ≤ IO ≤ 750 mA 7
Load regulation ΔVO 120 mV Over temperature, 5 mA ≤ IO ≤ 1 A 7
Quiescent current IQ 8 mA IO ≤ 1 A, TJ = 25°C 7
Quiescent current IQ 8.5 mA IO ≤ 1 A, over temperature 7
Quiescent current change ΔIQ 0.5 mA 5 mA ≤ IO ≤ 1 A 7
Quiescent current change ΔIQ 1 mA TJ = 25°C, IO ≤ 1 A, 14.8 V ≤ VIN ≤ 27 V 7
Ripple rejection 55 72 dB f = 120 Hz, 15 V ≤ VIN ≤ 25 V, TJ = 25°C, IO ≤ 1 A 7
Ripple rejection 55 dB f = 120 Hz, 15 V ≤ VIN ≤ 25 V, over temperature, IO ≤ 500 mA 7
Input voltage required to maintain line regulation VIN 14.6 V TJ = 25°C, IO ≤ 1 A 7
Output noise voltage VN 75 μV TA = 25°C, 10 Hz ≤ f ≤ 100 kHz 7
Dropout voltage 2 V TJ = 25°C, IO = 1 A 7
Output resistance RO 18 mΩ f = 1 kHz 7
Short-circuit current 1.5 A TJ = 25°C 7
Peak output current 2.4 A TJ = 25°C 7
Average temperature coefficient of VOUT -1.5 mV/°C Over temperature, IO = 5 mA 7
Junction-to-ambient thermal resistance (RθJA) RθJA 23.9 °C/W TO-220 (NDE) column, Thermal Information table 4
Junction-to-case (top) thermal resistance RθJC(top) 16.7 °C/W TO-220 (NDE) column, Thermal Information table 4
Junction-to-case (bottom) thermal resistance RθJC(bot) 1.7 °C/W TO-220 (NDE) column, Thermal Information table 4
Junction-to-ambient thermal resistance (footnote 3) θJA 54 °C/W TO-220 package (NDE), footnote (3) 4
Junction-to-case thermal resistance (footnote 3) θJC 4 °C/W TO-220 package (NDE), footnote (3) 4

CAD (KiCad official)

  • Symbol: LM340T-12
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: lm340t-12-etched.step / lm340t-12-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm340t-12.step / lm340t-12.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (34 pp, sha256 8060cb24659a658e, 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