# TLV74128PDBVR

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

TLV74128PDBVR from Texas Instruments, in a SOT-23-5. 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 | IN | power_in | Input pin; use a small capacitor from this pin to ground, with the input supply range given as 1.4 V to 5.5 V in the recommended operating conditions. |
| 2 | GND | power_in | Ground pin, which is electrically connected to the thermal pad. |
| 3 | EN | input | Enable pin; driving EN over 0.9 V turns on the regulator and driving EN below 0.4 V puts it into shutdown mode. |
| 4 | NC | unconnected | No internal connection. |
| 5 | OUT | power_out | Regulated output voltage pin; use a small 1-µF ceramic capacitor from this pin to ground for best transient response. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage | VIN | -0.3 |  | 6 | V |  | 4 |
| Output voltage | VOUT | -0.3 |  | 3.6 | V |  | 4 |
| Enable voltage | VEN | -0.3 |  |  | V | max printed as VIN + 0.3 V | 4 |
| Junction temperature | TJ | -55 |  | 125 | °C |  | 4 |
| Storage temperature | Tstg | -55 |  | 150 | °C |  | 4 |
| Input voltage | VIN | 1.4 |  | 5.5 | V |  | 4 |
| Enable range | VEN | 0 |  |  | V | max printed as VIN | 4 |
| Output current | IOUT | 0 |  | 150 | mA |  | 4 |
| Input capacitor | CIN | 0 |  | 1 | µF |  | 4 |
| Output capacitor | COUT | 1 |  | 100 | µF |  | 4 |
| Operating junction temperature | TJ | -40 |  | 125 | °C |  | 4 |
| Junction-to-ambient thermal resistance DBV (SOT-23, 5 pins) | RθJA |  | 249 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance DBV | RθJC(top) |  | 172.7 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance DBV | RθJB |  | 76.7 |  | °C/W |  | 4 |
| Junction-to-top characterization parameter DBV | ψJT |  | 49.7 |  | °C/W |  | 4 |
| Junction-to-board characterization parameter DBV | ψJB |  | 75.8 |  | °C/W |  | 4 |
| DC output accuracy |  | -1 |  | 1 | % | VOUT ≥ 1.8 V, TJ = 25°C | 5 |
| DC output accuracy |  | -1.5 |  | 1.5 | % | VOUT ≥ 1.2 V, -40°C ≤ TJ ≤ 125°C | 5 |
| Line regulation | ΔVOUT(ΔVIN) |  | 1 | 5 | mV | Maximum {VOUT(nom) + 0.5 V, VIN = 2 V} ≤ VIN ≤ 5.5 V | 5 |
| Load regulation | ΔVOUT(ΔIOUT) |  | 10 | 30 | mV | 0 mA ≤ IOUT ≤ 150 mA | 5 |
| Dropout voltage | VDO |  | 246 | 445 | mV | 2.5 V ≤ VOUT < 3 V, IOUT = 150 mA, TJ = -40°C to 85°C | 5 |
| Dropout voltage | VDO |  | 246 | 565 | mV | 2.5 V ≤ VOUT < 3 V, IOUT = 150 mA, TJ = -40°C to 125°C | 5 |
| Ground pin current | IGND |  | 50 | 75 | µA | IOUT = 0 mA | 5 |
| Shutdown current | ISHUTDOWN |  | 0.1 | 1 | µA | VEN ≤ 0.4 V, 2 V ≤ VIN ≤ 5.5 V, TJ = 25°C | 5 |
| Enable low (disabled) threshold | VLO | 0 |  | 0.4 | V |  | 6 |
| Pulldown resistor | RPULLDOWN |  | 120 |  | Ω | VIN = 4 V | 6 |

## CAD (KiCad official)

- Symbol: `TLV74128PDBVR`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `tlv74128pdbvr-etched.step` / `tlv74128pdbvr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlv74128pdbvr.step` / `tlv74128pdbvr.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/tlv741p) (34 pp, sha256 `cb018de90b2c3433`, retrieved 2026-11-05, tier: manufacturer)
- **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-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/tlv74128pdbvr-datasheet.pdf)