# BA50DD0T

**ROHM Semicon** · Linear Voltage Regulators (LDO) · TO-220-3

BA50DD0T from ROHM Semicon, in a TO-220-3. 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 | Vcc | power_in | Power supply voltage input; recommended 3.0V to 25.0V for BAxxDD0xx, with a capacitor greater than 0.33µF to GND. |
| 2 | GND | power_in | Ground terminal (N.C./GND pin is GND on TO220FP-3); keep set ground and IC ground at the same potential. |
| 3 | OUT | power_out | Voltage output (5.0V for BA50DD0T, up to 2A); requires an anti-oscillation capacitor between Vo and GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ROHM Semicon |
| Package | TO-220-3 |
| Category | Power Management |
| 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 | Vo |  | 5 |  | V | Io=200mA, Vcc=7.0V, VCTL=3V, Ta=25C; limits printed as Votyp x 0.99 to Votyp x 1.01 | 6 |
| Shut Down Current | Isd |  | 0 | 10 | μA | VCTL=0V, Io=0mA | 6 |
| Bias Current | Ib |  | 0.9 | 2 | mA | Io=0mA | 6 |
| Dropout Voltage 1 | ΔVd1 |  | 0.3 | 0.5 | V | Vcc=0.95×Vo, Io=1A | 6 |
| Dropout Voltage 2 | ΔVd2 |  | 0.45 | 0.7 | V | Vcc=0.95×Vo, Io=2A | 6 |
| Peak Output Current | Io | 2 |  |  | A |  | 6 |
| Line Regulation | Reg.I |  | 15 | 50 | mV | Vcc=VCCT V→25V, Io=200mA | 6 |
| Load Regulation | Reg.L |  | 50 | 200 | mV | Io=0mA→2A | 6 |
| Ripple Rejection | R.R. |  | 55 |  | dB | f=120Hz, ein=-20dBV, Io=100mA | 6 |
| Temperature Coefficient of Output Voltage | Tcvo |  | 0.02 |  | %/℃ | Io=5mA, Tj=0 to 125℃ (typ printed as ±0.02; not 100% tested) | 6 |
| Input Power Supply Voltage | VCC | 3 |  | 25 | V | BAxxDD0xx, Ta=25℃ | 5 |
| Output Current | Io |  |  | 2 | A | BAxxDD0xx, Ta=25℃ | 5 |
| Input Power Supply Voltage | VCC | -0.3 |  | 35 | V | Ta=25℃; must not exceed Pd | 5 |
| Power Dissipation | Pd |  |  | 2000 | mW | TO220FP-3,5, Ta=25℃, no heat sink | 5 |
| Operating Temperature Range | Topr | -40 |  | 125 | ℃ | Ta=25℃ | 5 |
| Ambient Storage Temperature | Tstg | -55 |  | 150 | ℃ | Ta=25℃ | 5 |
| Junction Temperature | TjMAX |  |  | 150 | ℃ | Ta=25℃ | 5 |
| Voltage Applied to the Tip | VCC peak |  |  | 50 | V | Applied voltage 200msec or less (tr≥1msec) | 5 |
| Thermal Resistance Junction-Ambient (IC alone) | θj-a |  | 62.5 |  | ℃/W | IC alone, TO220FP package (printed as θj-6 on page 13; θja on page 14) | 13 |
| Thermal Resistance Junction-Case (max heat sink) | θj-c |  | 6.25 |  | ℃/W | When using a maximum heat sink | 13 |

## CAD (KiCad official)

- Symbol: `BA50DD0T`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220-3 (KiCad packages3D, STEP)
- 3D model files: `ba50dd0t-etched.step` / `ba50dd0t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ba50dd0t.step` / `ba50dd0t.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [ROHM Semicon datasheet](docs/ba50dd0t-datasheet.pdf) (23 pp, sha256 `a7cdaf4806983a19`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ba50dd0t-datasheet.pdf)