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MD85A28PA1
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Shanghai Mingda Microelectronics Linear Voltage Regulators (LDO), SOT-89-3L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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MD85A28PA1
Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-89-3L
MD85A28PA1 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 | GND | power_in | Ground reference pin for the regulator; the datasheet gives no separate electrical limit for this pin. |
| 2 | VIN | power_in | Power input pin; the input voltage range is 2.2V to 40V in operation, with an absolute maximum rating of -0.3V to 45V. |
| 3 | VOUT | power_out | Regulated output voltage pin; the VOUT pin potential must not exceed VIN+0.3V to avoid reverse current damage through the parasitic diode between VIN and VOUT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-3L |
| Category | Power Supply Chip |
| 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(S) | 0.98 | 1.02 | V | VIN=VOUT(S)+2V, IOUT=1mA | 5 | |
| GND Current | IGND | 0.8 | 1.2 | 2 | uA | no load, VOUT(S)<3.0V, VEN=VIN | 5 |
| Input Voltage | VIN | 2.2 | 40 | V | 5 | ||
| EN H Level Voltage | VENH | 1.5 | 40 | V | 5 | ||
| EN L Level Voltage | VENL | 0 | 0.6 | V | 5 | ||
| EN H Level Current | IENH | -0.1 | 0.1 | uA | VIN=40V, VEN=VIN | 5 | |
| EN L Level Voltage | IENL | -0.1 | 0.1 | uA | VIN=40V, VEN=0 | 5 | |
| Line Regulation | ΔVOUT/ΔVIN | 0.01 | 0.02 | ％/V | VOUT(S)+2V≤VIN≤40V, IOUT=1mA | 5 | |
| Load Regulation | VOUT2 | 25 | 50 | mV | VIN=VOUT(S)+2V, 1mA≤IOUT≤300mA, VOUT(S)≤5.3V | 5 | |
| Temperature Stability | ΔVOUT/ΔT | -50 | 50 | ppm/℃ | VIN=VOUT(S)+2V, IOUT=10mA, -40℃≤Ta≤125℃ | 5 | |
| Shutdown Current | ISHUT | 0.1 | 1 | uA | VIN=40.0V, VEN=0 | 5 | |
| Maximum Output Current | IOUTMAX | 300 | 350 | mA | 5 | ||
| Current Limit | ILIM | 350 | 550 | mA | VIN=VOUT(S)+2V, VOUT=0.95×VOUT(S) | 5 | |
| Short Circuit Current | ISHORT | 65 | mA | VIN=VEN=VOUT(S)+2.0V, VOUT=0V | 5 | ||
| Power Supply Rejection Ratio | PSRR | 79 | dB | f=100Hz, IOUT=10mA | 5 | ||
| Power Supply Rejection Ratio | PSRR | 62 | dB | f=1kHz, IOUT=10mA | 5 | ||
| Power Supply Rejection Ratio | PSRR | 48 | dB | f=10kHz, IOUT=10mA | 5 | ||
| Power Supply Rejection Ratio | PSRR | 40 | dB | f=100kHz, IOUT=10mA | 5 | ||
| Over Temperature Protection | OTP | 170 | ℃ | IOUT=1mA | 5 | ||
| Input Voltage (absolute maximum) | VIN | -0.3 | 45 | V | Ta=25℃ unless otherwise indicated | 4 | |
| Power Dissipation SOT89-3 | PD | 1000 | mW | SOT89-3 | 4 | ||
| Thermal Resistance SOT89-3 | RθJA | 100 | ℃/W | SOT89-3 | 4 | ||
| Operating Ambient Temperature | Topr | -40 | 85 | ℃ | 4 | ||
| Storage Temperature | Tstg | -40 | 125 | ℃ | 4 | ||
| ESD Protection HBM | ESD HBM | 5000 | V | 4 | |||
| Output Capacitor Withstand Voltage | COUT | 25 | V | COUT=1uF, recommended withstand voltage not less than 25V | 1 | ||
| Output Capacitor Capacitance Change | COUT | -20 | 20 | % | COUT=1uF, high or low temperature | 1 |
CAD (KiCad official)
- Symbol:
MD85A28PA1 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files:
md85a28pa1-etched.step/md85a28pa1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);md85a28pa1.step/md85a28pa1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Mingda Microelectronics datasheet (16 pp, sha256
eb9db1999ca1681a, retrieved 2026-10-27, 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).
# MD85A28PA1
**Shanghai Mingda Microelectronics** · Linear Voltage Regulators (LDO) · SOT-89-3L
MD85A28PA1 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 | GND | power_in | Ground reference pin for the regulator; the datasheet gives no separate electrical limit for this pin. |
| 2 | VIN | power_in | Power input pin; the input voltage range is 2.2V to 40V in operation, with an absolute maximum rating of -0.3V to 45V. |
| 3 | VOUT | power_out | Regulated output voltage pin; the VOUT pin potential must not exceed VIN+0.3V to avoid reverse current damage through the parasitic diode between VIN and VOUT. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Mingda Microelectronics |
| Package | SOT-89-3L |
| Category | Power Supply Chip |
| 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(S) | 0.98 | | 1.02 | V | VIN=VOUT(S)+2V, IOUT=1mA | 5 |
| GND Current | IGND | 0.8 | 1.2 | 2 | uA | no load, VOUT(S)<3.0V, VEN=VIN | 5 |
| Input Voltage | VIN | 2.2 | | 40 | V | | 5 |
| EN H Level Voltage | VENH | 1.5 | | 40 | V | | 5 |
| EN L Level Voltage | VENL | 0 | | 0.6 | V | | 5 |
| EN H Level Current | IENH | -0.1 | | 0.1 | uA | VIN=40V, VEN=VIN | 5 |
| EN L Level Voltage | IENL | -0.1 | | 0.1 | uA | VIN=40V, VEN=0 | 5 |
| Line Regulation | ΔVOUT/ΔVIN | | 0.01 | 0.02 | ％/V | VOUT(S)+2V≤VIN≤40V, IOUT=1mA | 5 |
| Load Regulation | VOUT2 | | 25 | 50 | mV | VIN=VOUT(S)+2V, 1mA≤IOUT≤300mA, VOUT(S)≤5.3V | 5 |
| Temperature Stability | ΔVOUT/ΔT | -50 | | 50 | ppm/℃ | VIN=VOUT(S)+2V, IOUT=10mA, -40℃≤Ta≤125℃ | 5 |
| Shutdown Current | ISHUT | | 0.1 | 1 | uA | VIN=40.0V, VEN=0 | 5 |
| Maximum Output Current | IOUTMAX | 300 | | 350 | mA | | 5 |
| Current Limit | ILIM | 350 | | 550 | mA | VIN=VOUT(S)+2V, VOUT=0.95×VOUT(S) | 5 |
| Short Circuit Current | ISHORT | | 65 | | mA | VIN=VEN=VOUT(S)+2.0V, VOUT=0V | 5 |
| Power Supply Rejection Ratio | PSRR | | 79 | | dB | f=100Hz, IOUT=10mA | 5 |
| Power Supply Rejection Ratio | PSRR | | 62 | | dB | f=1kHz, IOUT=10mA | 5 |
| Power Supply Rejection Ratio | PSRR | | 48 | | dB | f=10kHz, IOUT=10mA | 5 |
| Power Supply Rejection Ratio | PSRR | | 40 | | dB | f=100kHz, IOUT=10mA | 5 |
| Over Temperature Protection | OTP | | 170 | | ℃ | IOUT=1mA | 5 |
| Input Voltage (absolute maximum) | VIN | -0.3 | | 45 | V | Ta=25℃ unless otherwise indicated | 4 |
| Power Dissipation SOT89-3 | PD | | | 1000 | mW | SOT89-3 | 4 |
| Thermal Resistance SOT89-3 | RθJA | | 100 | | ℃/W | SOT89-3 | 4 |
| Operating Ambient Temperature | Topr | -40 | | 85 | ℃ | | 4 |
| Storage Temperature | Tstg | -40 | | 125 | ℃ | | 4 |
| ESD Protection HBM | ESD HBM | | | 5000 | V | | 4 |
| Output Capacitor Withstand Voltage | COUT | 25 | | | V | COUT=1uF, recommended withstand voltage not less than 25V | 1 |
| Output Capacitor Capacitance Change | COUT | -20 | | 20 | % | COUT=1uF, high or low temperature | 1 |
## CAD (KiCad official)
- Symbol: `MD85A28PA1`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `md85a28pa1-etched.step` / `md85a28pa1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `md85a28pa1.step` / `md85a28pa1.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Shanghai Mingda Microelectronics datasheet](docs/md85a28pa1-datasheet.pdf) (16 pp, sha256 `eb9db1999ca1681a`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/md85a28pa1-datasheet.pdf)