component
MD78U50
Public Made by Adomby adom
Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3L. 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
markdownMD78U50
Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3L
MD78U50 from Shanghai Mingda Microelectronics, in a SOT-89-3L. 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 | OUT | power_out | Output terminal of the regulator; the datasheet warns that VOUT must not exceed VIN+0.3V, because reverse current through the parasitic diode can destroy the IC. |
| 2 | GND | power_in | Ground terminal; the datasheet gives no further electrical limit for this pin. |
| 3 | VDD | power_in | Power input terminal; the absolute maximum input voltage (VIN) is 30 V, and the output is held in regulation across the input range stated in the electrical characteristics. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-3L |
| 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 | VOUT | 4.85 | 5 | 5.15 | V | VIN= 7V，IOUT=10mA | 3 |
| Output current | IOUT | 120 | 150 | mA | VIN= 7V | 3 | |
| Input-output voltage difference | Vdrop | 80 | mV | IOUT=10mA | 3 | ||
| Input-output voltage difference | Vdrop | 8 | mV | IOUT=1mA | 3 | ||
| Input stability | △VOUT/△VIN·VOUT | 0.05 | 0.2 | ％/V | 6V≤VIN≤30V, IOUT=1mA | 3 | |
| Load regulation | △VOUT2 | 60 | 100 | mV | VIN=7V, 1.0mA≤IOUT≤120mA | 3 | |
| Output voltage temperature coefficient | △VOUT/△Ta·VOUT | -100 | 100 | Ppm/℃ | VIN=7V，IOUT=10mA, -40℃≤Ta≤85℃ | 3 | |
| Output voltage temperature coefficient (typical) | △VOUT/△Ta·VOUT | 50 | Ppm/℃ | VIN=7V，IOUT=10mA, -40℃≤Ta≤85℃ | 3 | ||
| Quiescent current | ISS | 30 | 40 | uA | VIN=30V 无负载 | 3 | |
| Input voltage (Vmax) | Vmax | 30 | V | 3 | |||
| Output short-circuit current | Ishort | 100 | mA | Vout=0V | 3 | ||
| Input voltage (absolute maximum) | VIN | 30 | V | 2 | |||
| Power dissipation, SOT_89 | PD | 500 | mW | SOT_89 package, Ta=25℃ | 2 | ||
| Operating ambient temperature range | Topr | -40 | 85 | ℃ | 2 | ||
| Storage ambient temperature range | Tstg | -40 | 125 | ℃ | 2 | ||
| Input capacitor | CIN | 1 | µF | 4 | |||
| Output capacitor (tantalum) | CL | 2.2 | µF | 钽电容器 | 4 | ||
| Output capacitor (aluminum electrolytic) | CL | 10 | µF | 铝电解电容器 | 4 | ||
| Output capacitor ESR (appropriate range) | ESR | 0.5 | 5 | Ω | approximate appropriate range, 左右 as printed | 5 |
CAD (KiCad official)
- Symbol:
MD78U50 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files:
md78u50-etched.step/md78u50-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);md78u50.step/md78u50.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Mingda Microelectronics datasheet (10 pp, sha256
ce26046787740645, retrieved 2026-10-20, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).