component
MC78M12BTG
Public Made by Adomby 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownMC78M12BTG
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mc78m12btg.step/mc78m12btg.glbare 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, 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).