# REF345SOT233

**analogysemi** · Voltage Reference · SOT-23-3

REF345SOT233 from analogysemi, in a SOT-23-3. 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 | IN | power_in | Supply input voltage; the datasheet recommends VIN from VOUT + 0.02 V (4.52 V for REF345) up to 5.5 V maximum, with a 1 µF bypass capacitor. |
| 2 | OUT | output | Analog reference voltage output of 4.5 V for REF345, rated for ±25 mA sourcing and sinking, with 0.1 µF to 10 µF recommended load capacitance. |
| 3 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | analogysemi |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Initial Accuracy |  | -0.1 | 0.05 | 0.1 | % |  | 6 |
| Line Regulation |  | -400 | 60 | 400 | µV/V | VOUT + 0.05V ≤ VIN ≤ 5.5V | 6 |
| Line Regulation |  | -550 |  | 550 | µV/V | −40°C ≤ TA ≤ 125°C, VOUT + 0.05V ≤ VIN ≤ 5.5V | 6 |
| Output Voltage Temperature Drift | dVOUT/dT |  | 5 | 20 | ppm/°C | −40°C ≤ TA ≤ 125°C | 6 |
| Load Regulation, sourcing | dVOUT/dLOAD | -30 | -2 | 30 | ppm/mA | Sourcing, 0mA < ILOAD < 25mA, VIN = VOUT + 250mV | 6 |
| Load Regulation, sourcing over temperature | dVOUT/dLOAD | -30 |  | 30 | ppm/mA | −40°C ≤ TA ≤ 125°C, sourcing, 0mA < ILOAD < 10mA, VIN = VOUT + 250mV | 6 |
| Load Regulation, sinking | dVOUT/dLOAD | -100 | -57 | 100 | ppm/mA | Sinking, −10mA < ILOAD < 0mA, VIN = VOUT + 100mV | 6 |
| Load Regulation, sinking over temperature | dVOUT/dLOAD | -150 |  | 150 | ppm/mA | −40°C ≤ TA ≤ 125°C, sinking, −10mA < ILOAD < 0mA, VIN = VOUT + 100mV | 6 |
| Thermal Hysteresis, first cycle | dT | -300 |  | 300 | ppm |  | 6 |
| Thermal Hysteresis, additional cycles | dT | -60 |  | 60 | ppm |  | 6 |
| Dropout Voltage |  |  | 2 | 11 | mV | ILOAD = 50µA, output > 2.048V | 6 |
| Output Current | ILOAD | -25 |  | 25 | mA | output > 2.048V, VIN = VOUT + 250mV | 6 |
| Voltage | VIN |  |  | 5.5 | V | IL = 0 | 7 |
| Current | IQ |  | 60 | 80 | µA | IL = 0 | 7 |
| Input Supply Voltage (recommended) | VIN |  |  | 5.5 | V |  | 4 |
| Output Current Range | IOUT | -25 |  | 25 | mA |  | 4 |
| Operating Temperature (recommended) | TA | -55 |  | 135 | °C |  | 4 |
| Input Voltage (absolute maximum) |  |  |  | 6.5 | V |  | 3 |
| Output Voltage (absolute maximum) |  |  |  | 5 | V |  | 3 |
| Operating Temperature (absolute maximum) | TA | -55 |  | 150 | °C |  | 3 |
| Junction Temperature (absolute maximum) | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature (absolute maximum) | Tstg | -65 |  | 150 | °C |  | 3 |
| Specified Temperature Range |  | -40 |  | 125 | °C |  | 7 |
| Ripple Rejection Ratio |  |  | -53 |  | dB | 100mV, 1kHz | 6 |
| Output Voltage | VOUT |  | 4.5 |  | V |  | 6 |
| Output Voltage Noise |  |  | 50 |  | µVPP | f = 0.1Hz to 10Hz | 6 |
| Voltage Noise |  |  | 48 |  | µVRMS | f = 10Hz to 10kHz | 6 |
| Noise Density |  |  | 680 |  | nV/√Hz | 1kHz | 6 |
| Solder Heat Resistance Shift |  |  | 0.015 |  | % |  | 6 |
| Long-Term Stability |  |  | 80 |  | ppm | 0h to 100h | 6 |
| Long-Term Stability |  |  | 130 |  | ppm | 0h to 1000h | 6 |
| Dropout Voltage |  |  | 100 |  | mV | ILOAD = 10mA, output > 2.048V | 6 |
| Short-Circuit Current, sourcing | ISC |  | 50 |  | mA | Sourcing | 7 |
| Short-Circuit Current, sinking | ISC |  | 50 |  | mA | Sinking | 7 |
| Turn-On Settling Time |  |  | 20 |  | ms | To 0.1% at VIN = 5V with CL = 0 | 7 |
| Load Capacitance | CL | 0.1 |  |  | nF |  | 7 |
| Current, overtemperature | IQ |  | 85 |  | µA | 0°C ≤ TA ≤ 125°C | 7 |
| Junction-to-Ambient Thermal Resistance | RθJA |  | 176.7 |  | °C/W | SOT23-3 | 4 |
| Junction-to-Board Thermal Resistance | RθJB |  | 22.9 |  | °C/W | SOT23-3 | 4 |
| Junction-to-Top Characterization Parameter | ψJT |  | 4.2 |  | °C/W | SOT23-3 | 4 |
| Junction-to-Board Characterization Parameter | ψJB |  | 26.7 |  | °C/W | SOT23-3 | 4 |
| Junction-to-Case (Top) Thermal Resistance | RθJC (top) |  | 84.9 |  | °C/W | SOT23-3 | 4 |

## CAD (KiCad official)

- Symbol: `REF345SOT233`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `ref345sot233-etched.step` / `ref345sot233-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref345sot233.step` / `ref345sot233.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [analogysemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602919079066431488) (17 pp, sha256 `1bd116cea5a7950d`, retrieved 2026-10-18, 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-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/ref345sot233-datasheet.pdf)