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MD53R55
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Shanghai Mingda Microelectronics Linear Voltage Regulators (LDO), SOT-89-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MD53R55
Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-89-5
MD53R55 from Shanghai Mingda Microelectronics, in a SOT-89-5. 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 | NC | unconnected | No internal connection on the SOT89-5 package. |
| 2 | GND | power_in | Ground pin (VSS); the SOT89-5 drawing also ties the center tab (labelled 2) to this pin. |
| 3 | EN | input | ON/OFF control input with VENH 1.0V to 10V for on and VENL 0V to 0.35V for off; has no internal pull-up/pull-down so must not be left floating, and tie to VIN if unused. |
| 4 | VIN | power_in | Input supply pin with operating input up to 10V (absolute maximum 12V); needs a CIN of 1.0uF or more. |
| 5 | VOUT | power_out | Regulated 5.5V output (±2%) for MD53R55, up to 500mA typical, with 50mA short-circuit current limit; needs COUT of 2.2uF or more with ESR of 0.5 to 5 ohm. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-5 |
| Category | Power Supply Chip |
| Pins | 5 |
CAD (KiCad official)
- Symbol:
MD53R55 - Footprint:
Package_TO_SOT_SMD:SOT-89-5 - 3D model: SOT-89-5 (KiCad packages3D, STEP)
- 3D model files:
md53r55-etched.step/md53r55-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);md53r55.step/md53r55.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Mingda Microelectronics datasheet (13 pp, sha256
264969efedda2a5d, retrieved 2026-10-23, 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).
# MD53R55
**Shanghai Mingda Microelectronics** · Linear Voltage Regulators (LDO) · SOT-89-5
MD53R55 from Shanghai Mingda Microelectronics, in a SOT-89-5. 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 | NC | unconnected | No internal connection on the SOT89-5 package. |
| 2 | GND | power_in | Ground pin (VSS); the SOT89-5 drawing also ties the center tab (labelled 2) to this pin. |
| 3 | EN | input | ON/OFF control input with VENH 1.0V to 10V for on and VENL 0V to 0.35V for off; has no internal pull-up/pull-down so must not be left floating, and tie to VIN if unused. |
| 4 | VIN | power_in | Input supply pin with operating input up to 10V (absolute maximum 12V); needs a CIN of 1.0uF or more. |
| 5 | VOUT | power_out | Regulated 5.5V output (±2%) for MD53R55, up to 500mA typical, with 50mA short-circuit current limit; needs COUT of 2.2uF or more with ESR of 0.5 to 5 ohm. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-5 |
| Category | Power Supply Chip |
| Pins | 5 |
## CAD (KiCad official)
- Symbol: `MD53R55`
- Footprint: `Package_TO_SOT_SMD:SOT-89-5`
- 3D model: SOT-89-5 (KiCad packages3D, STEP)
- 3D model files: `md53r55-etched.step` / `md53r55-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md53r55.step` / `md53r55.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md53r55-datasheet.pdf) (13 pp, sha256 `264969efedda2a5d`, retrieved 2026-10-23, 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`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-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).
[Datasheet PDF](docs/md53r55-datasheet.pdf)