component
MD7733
Public Made by Adomby adom
Shanghai Mingda Microelectronics DC-DC Converters, TO-92-3. 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
markdownMD7733
Shanghai Mingda Microelectronics · DC-DC Converters · TO-92-3
MD7733 from Shanghai Mingda Microelectronics, in a TO-92-3. 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 | Vss | power_in | Ground pin (Vss/GND); absolute maximum Vout, CE and Lx voltages are referenced to Vss. |
| 2 | Vout | power_out | Output voltage monitoring pin that also supplies the internal circuit; absolute maximum is Vss-0.3 to Vss+12 V. |
| 3 | Lx | output | Switching pin connected to the inductor; absolute maximum is Vss-0.3 to Vss+12 V with ILX up to 1000 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | TO-92-3 |
| 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 | △Vout | -2.5 | 2.5 | % | 3 | ||
| Input voltage | Vin | 10 | V | 3 | |||
| Start voltage | Vstart | 0.75 | 0.9 | V | Iout=1mA, Vin: 0→2V | 3 | |
| Hold voltage | Vhold | 0.7 | V | Iout=1mA, Vin: 2→0V | 3 | ||
| Input current | Iin | 10 | 20 | uA | Iout=0mA | 3 | |
| Quiescent power consumption | IDD | 4 | 7 | uA | VS = VOUT+0.5V | 3 | |
| Shutdown current | ISHDN | 0.5 | uA | CE=GND | 4 | ||
| CE high-level voltage | VCEH | 2 | V | 4 | |||
| CE low-level voltage | VCEL | 0.4 | V | 4 | |||
| Switch leakage current | ILEAK | 0.5 | uA | VS = VOUT+0.5V, VX=6V | 4 | ||
| Duty cycle | DOSC | 65 | 75 | 85 | % | VS = VOUT*0.95 | 4 |
| Operating temperature range | Tmin-max | -20 | 80 | ℃ | 3 | ||
| Storage temperature range | Tstorage | -40 | 125 | ℃ | 3 | ||
| Lx current | ILX | 1000 | mA | 3 | |||
| Soldering temperature | 260 | ℃ | 10 S | 3 | |||
| Oscillation frequency | FOSC | 110 | kHz | VS = VOUT*0.95 | 4 | ||
| Efficiency | η | 85 | % | 4 | |||
| Nominal output voltage (MD7733 = 3.3V version) | VOUT | 3.3 | V | MD7733 variant | 2 |
CAD (KiCad official)
- Symbol:
MD7733 - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files:
md7733-etched.step/md7733-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);md7733.step/md7733.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Mingda Microelectronics datasheet (12 pp, sha256
59f5984eab2f611d, retrieved 2026-10-19, 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-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).