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MC78M12BTG

Public Made by Adom

by adom

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

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MC78M12BTG

onsemi · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

MC78M12BTG from onsemi, 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 power_in Unregulated input voltage; the maximum input voltage for the 5.0 V to 18 V option is 35 Vdc, and a 0.33 µF or larger low-impedance bypass capacitor should be mounted directly across the input when wire lengths are long or the output load capacitance is large.
2 Ground power_in Common ground reference for the regulator; the heatsink surface of the TO-220 package is connected to this pin.
3 Output power_out Regulated 12 V output with internal current limiting; short-circuit current limit is 350 mA typical and peak output current is 700 mA typical at TJ = 25°C, with a maximum output of 500 mA with adequate heatsinking.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-220
Category Power Management (PMIC)
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
Output Voltage (TJ = 25°C), MC78M12B/MC78M12C/NCV78M12B column VO 11.5 12 12.5 Vdc TJ = 25°C 4
Output Voltage Variation, MC78M12B column VO 11.4 12.6 Vdc 14.5 Vdc ≤ VI ≤ 27 Vdc, 5.0 mA ≤ IO ≤ 350 mA 4
Line Regulation Regline 8 50 mV TJ = 25°C, 14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA 4
Load Regulation Regload 25 240 mV TJ = 25°C, 5.0 mA ≤ IO ≤ 500 mA 4
Load Regulation Regload 10 120 mV TJ = 25°C, 5.0 mA ≤ IO ≤ 200 mA 4
Input Bias Current IIB 3.2 6 mA TJ = 25°C 4
Quiescent Current Change IIB 0.8 mA 14.5 Vdc ≤ VI ≤ 30 Vdc, IO = 200 mA 4
Quiescent Current Change IIB 0.5 mA 5.0 mA ≤ IO ≤ 350 mA 4
Ripple Rejection RR 55 dB IO = 100 mA, f = 120 Hz, 15 V ≤ VI ≤ 25 V 4
Ripple Rejection RR 55 80 dB IO = 300 mA, f = 120 Hz, 15 V ≤ VI ≤ 25 V, TJ = 25°C 4
Input Voltage (5.0 V−18 V option) VI 35 Vdc Input voltage rating for 5.0 V−18 V option 2
Output Noise Voltage Vn 75 V TA = 25°C, 10 Hz ≤ f ≤ 100 kHz 4
Dropout Voltage VI−VO 2 Vdc TJ = 25°C 4
Short Circuit Current Limit IOS 350 mA TJ = 25°C, VI = 35 V 4
Average Temperature Coefficient of Output Voltage VO/T -0.3 0.3 mV/°C IO = 5.0 mA 4
Peak Output Current IO 700 mA TJ = 25°C 4
Operating Junction Temperature Range (MC78M12BTG ordering) TJ -40 125 °C TJ = −40° to +125°C per ordering table for MC78M12BTG 12
Operating Junction Temperature Range TJ 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Thermal Resistance, Junction-to-Air (T Suffix, TO-220) θJA 70 °C/W T Suffix (TO-220 package) 2
Thermal Resistance, Junction-to-Case (T Suffix, TO-220) θJC 5 °C/W T Suffix (TO-220 package) 2

CAD (KiCad official)

  • Symbol: MC78M12BTG
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: mc78m12btg-etched.step / mc78m12btg-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mc78m12btg.step / mc78m12btg.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (15 pp, sha256 2339bbc0a38dcd3b, retrieved 2026-10-19, tier: lcsc)
  • 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