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MD5121
Public Made by Adomby adom
Shanghai Mingda Microelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3L. 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
markdownMD5121
Shanghai Mingda Microelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L
MD5121 from Shanghai Mingda Microelectronics, in a SOT-23-3L. 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 | GND | power_in | Ground pin; also the return for the internal COUT auto-discharge switch (RDCHG 280-640 ohm) connected to VOUT. |
| 2 | VOUT | power_out | Regulated 2.1V output (±2%) delivering up to 300mA (250mA min); VOUT must not exceed VIN+0.3V, and COUT of 0.1uF or more is recommended. |
| 3 | VIN | power_in | Supply input, 1.5V to 7V operating range (absolute maximum -0.3 to 8.0V); CIN of 1.0uF or more is recommended, placed close to the IC. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-23-3L |
| 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 accuracy (product selection, MD5121 2.1V) | VOUT(S) | -2 | 2 | % | VIN=VOUT(S)+1.0V, IOUT=10mA, VOUT(S)≥2.0V | 2 | |
| Input Voltage | VIN | 1.5 | 7 | V | 2 | ||
| Line Regulation | 0.05 | 0.1 | ％/V | VOUT(S)+0.5V≤VIN=VCE≤7V, IOUT=10mA | 2 | ||
| Load Regulation | VOUT | 6 | 20 | mV | VIN=VCE=VOUT(S)+1.0V, 1mA≤IOUT≤100mA | 2 | |
| Temperature Stability | -50 | 50 | ppm/℃ | VIN=VCE=VOUT(S)+1.0V, IOUT=1mA, -40℃≤Ta≤85℃ | 2 | ||
| Dropout Voltage (VOUT＜3V) | VDROP | 70 | mV | VCE=VIN, VOUT＜3V, IOUT=100mA | 2 | ||
| GND Current (no load) | IGND | 0.5 | 0.9 | uA | CE=VIN, no load | 2 | |
| GND Current (IOUT=100mA) | IGND | 40 | uA | CE=VIN, IOUT=100mA | 2 | ||
| Shutdown Current | ISHUT | 0.01 | 0.1 | uA | VIN=7.0V, VCE=0 | 2 | |
| Maximum Output Current | IOUTMAX | 250 | 300 | mA | 2 | ||
| Current Limit | ILIM | 300 | 470 | mA | VIN=VCE=VOUT(S)+1.0V, VOUT = 0.95 ×VOUT(S) | 2 | |
| Short Circuit Current | ISHORT | 65 | mA | VIN=VCE=VOUT(S)+1.0V, VOUT=0V | 2 | ||
| COUT Auto Discharge Resistance | RDCHG | 280 | 450 | 640 | Ω | VCE=0, VOUT=VOUT(S) | 2 |
| CE 'H' Level Voltage | VCEH | 1 | 6 | V | 2 | ||
| CE 'L' Level Voltage | VCEL | 0 | 0.38 | V | 3 | ||
| CE 'H' Level Current | ICEH | -0.1 | 0.1 | uA | VIN=6.0V, VCE=VIN | 3 | |
| CE 'L' Level Current | ICEL | -0.1 | 0.1 | uA | VIN=6.0V, VCE=0 | 3 | |
| Input Voltage (absolute maximum) | VIN | -0.3 | 8 | V | 2 | ||
| Output Voltage (absolute maximum; upper limit printed as VIN+0.3V) | VOUT | -0.3 | V | 2 | |||
| Power Dissipation (SOT23-3L) | PD | 250 | mW | SOT23-3L package | 2 | ||
| Operating Ambient Temperature | Topr | -40 | 85 | ℃ | 2 | ||
| Storage Temperature | Tstg | -40 | 125 | ℃ | 2 | ||
| ESD Protection (HBM) | ESD HBM | 6000 | V | 2 | |||
| Output Voltage (nominal, MD5121 product selection) | VOUT(S) | 2.1 | V | 1 |
CAD (KiCad official)
- Symbol:
MD5121 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files:
md5121-etched.step/md5121-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);md5121.step/md5121.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Mingda Microelectronics datasheet (14 pp, sha256
b9016866a24d108a, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).