# REG104GA-2.5

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-6

REG104GA-2.5 from Texas Instruments, in a SOT-223-6. 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 package tab is also electrically connected to ground and is not intended to carry current. |
| 2 | Enable | input | Active-high enable input compatible with TTL/CMOS levels; inputs below 0.5V (max) turn the regulator off, VENABLE high is 2V minimum, and the absolute maximum is VIN; it may be tied to VIN when unused. |
| 3 | VIN | power_in | Supply input; operating input range is 2.1V to 15V, with an absolute maximum of 16V, and VIN must be at least VOUT + 0.7V (VOUT + 0.9V over the full temperature range) for specified regulation. |
| 4 | NR/Adjust | passive | On fixed-voltage versions this is the noise-reduction pin, where an optional capacitor CNR (for example 0.01µF) to ground lowers output noise; the absolute maximum voltage on this pin is 6.0V. |
| 5 | VOUT | power_out | Regulated output; no output capacitor is required for stability, and an optional low-ESR capacitor (for example 0.1µF) may be used to improve transient response. |
| 6 | Tab (GND) | power_in | Metal tab of the SOT-223 package, electrically connected to ground, which serves as the heat sink and must be isolated from any load current path. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-223-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Accuracy |  | -2 | 0.5 | 2 | % |  | 3 |
| Accuracy over temperature |  | -3 |  | 3 | % | TJ = -40°C to +85°C | 3 |
| Output voltage change vs line and load |  | -2.5 | 0.5 | 2.5 | % | IOUT = 10mA to 1A, VIN = (VOUT + 0.7V) to 15V | 3 |
| Output voltage change vs line and load over temperature |  | -3.5 |  | 3.5 | % | TJ = -40°C to +85°C, VIN = (VOUT + 0.9V) to 15V | 3 |
| DC dropout voltage | VDROP |  | 3 | 25 | mV | IOUT = 10mA | 3 |
| DC dropout voltage | VDROP |  | 230 | 400 | mV | For all models except 5V, IOUT = 1A | 3 |
| DC dropout voltage over temperature | VDROP |  |  | 480 | mV | For all models except 5V, IOUT = 1A, TJ = -40°C to +85°C | 3 |
| Current limit | ICL | 1.2 | 1.7 | 2.1 | A |  | 3 |
| Current limit over temperature | ICL | 1 |  | 2.2 | A | TJ = -40°C to +85°C | 3 |
| Ground pin current | IGND |  | 0.5 | 0.7 | mA | IOUT = 10mA | 3 |
| Ground pin current | IGND |  | 1.7 | 1.8 | mA | IOUT = 1A | 3 |
| Operating input voltage range | VIN | 2.1 |  | 15 | V |  | 3 |
| Specified input voltage range | VIN |  |  | 15 | V | VIN > 2.7V | 3 |
| Specified input voltage range over temperature | VIN |  |  | 15 | V | TJ = -40°C to +85°C, VIN > 2.9V | 3 |
| VENABLE high (output enabled) | VENABLE | 2 |  |  | V |  | 3 |
| VENABLE low (output disabled) | VENABLE | -0.2 |  | 0.5 | V |  | 3 |
| IENABLE high (output enabled) | IENABLE |  | 1 | 100 | nA | VENABLE = 2V to VIN, VIN = 2.1V to 6.5(5) | 3 |
| IENABLE low (output disabled) | IENABLE |  | 2 | 100 | nA | VENABLE = 0V to 0.5V | 3 |
| Specified temperature range (TJ) | TJ | -40 |  | 85 | °C |  | 3 |
| Operating temperature range | TJ | -55 |  | 125 | °C |  | 3 |
| Storage temperature range | TSTG | -65 |  | 150 | °C |  | 3 |
| Supply input voltage | VIN | -0.3 |  | 16 | V |  | 2 |
| Enable input voltage | VEN | -0.3 |  |  | V |  | 2 |
| Feedback voltage | VFB | -0.3 |  | 6 | V |  | 2 |
| NR pin voltage | VNR | -0.3 |  | 6 | V |  | 2 |
| Junction temperature | TJ | -55 |  | 150 | °C |  | 2 |
| Lead temperature (soldering) |  |  |  | 240 | °C | soldering, 3s, SOT and DDPAK | 2 |
| ESD rating HBM (VOUT to GND) |  |  |  | 1.5 | kV | HBM, VOUT to GND | 2 |
| ESD rating HBM (all other pins) |  |  |  | 2 | kV | HBM, all other pins | 2 |
| ESD rating CDM |  |  |  | 500 | V | CDM | 2 |
| Output voltage range (REG104-2.5) | VOUT |  | 2.5 |  | V | REG104-2.5 | 3 |
| Output voltage drift vs temperature | dVOUT/dT |  | 70 |  | ppm/°C | TJ = -40°C to +85°C | 3 |
| Voltage noise without CNR | Vn |  | 35 |  | µVRMS/V • VOUT | f = 10Hz to 100kHz, CNR = 0, COUT = 0 | 3 |
| Voltage noise with CNR | Vn |  | 10 |  | µVRMS/V • VOUT | f = 10Hz to 100kHz, CNR = 0.01µF, COUT = 10µF | 3 |
| Ripple rejection |  |  | 65 |  | dB | f = 120Hz | 3 |
| Output disable time |  |  | 50 |  | µs |  | 3 |
| Output enable softstart time |  |  | 1.5 |  | ms |  | 3 |
| Thermal shutdown junction temperature |  |  | 150 |  | °C | Shutdown | 3 |
| Thermal shutdown reset junction temperature |  |  | 130 |  | °C | Reset from shutdown | 3 |
| Ground pin current, enable pin low | IGND |  | 0.5 |  | µA | VENABLE ≤ 0.5V | 3 |
| Thermal resistance junction-to-case (SOT223-5) | θJC |  | 15 |  | °C/W | Junction-to-case, SOT223-5 surface mount | 3 |

## CAD (KiCad official)

- Symbol: `REG104GA-2.5`
- Footprint: `Package_TO_SOT_SMD:SOT-223-6`
- 3D model: SOT-223-6 (KiCad packages3D, STEP)
- 3D model files: `reg104ga-2-5-etched.step` / `reg104ga-2-5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `reg104ga-2-5.step` / `reg104ga-2-5.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/reg104) (24 pp, sha256 `6b91d55dac661ff5`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/reg104ga-2-5-datasheet.pdf)