# LHR3025AFAA

**Legendsemi** · Voltage Reference · SOP-8

LHR3025AFAA from Legendsemi, in a SOP-8. 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 | DNC | unconnected | Do not connect; this pin must be left unconnected. |
| 2 | VIN | power_in | Supply voltage input; VIN must be VOUT + 0.2 V to 18 V (recommended range, Table 4), with a 2.7 V minimum for LHR3020 and for VOUT ≤ 2.5 V such as the LHR3025. |
| 3 | TEMP | output | Temperature monitor output giving VTEMP = 668 mV + 1.91 mV/°C × T (about ±15 °C accuracy); it has high output impedance, so a low-drift buffer amplifier is needed when loading it. |
| 4 | GND | power_in | Ground reference pin; the output capacitor of 1 µF to 50 µF must be connected from VOUT to GND. |
| 5 | NC | unconnected | No internal connection; the pin is not connected inside the device. |
| 6 | VOUT | output | Reference voltage output (2.5 V for LHR3025), rated for ±10 mA source and sink current, with a 1 µF to 50 µF output capacitor to GND. |
| 7 | DNC | unconnected | Do not connect; this pin must be left unconnected. |
| 8 | DNC | unconnected | Do not connect; this pin must be left unconnected. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Legendsemi |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## 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, high grade (LHR3025AFAA, 'A' = 3 ppm grade) |  | -0.05 |  | 0.05 | % | 所有电压选项（1） | 5 |
| Output voltage temperature drift, high grade | δVOUT/dT |  | 1 | 3 | ppm/°C |  | 5 |
| Line regulation | δVO(δVI) |  | 0.1 | 1 | ppm/V | VIN = (VOUT + 0.2) 至 18V（2） | 5 |
| Line regulation over temperature | δVO(δVI) |  | 0.2 | 1 | ppm/V | VIN = VOUT + 0.2V, TA = -40°C 至 125°C（2） | 5 |
| Load regulation | δVO(δIL) |  | 20 | 30 | ppm/mA | -10mA < ILOAD < 10mA, VIN = VOUT + 0.75V（3） | 5 |
| Load regulation over temperature | δVO(δIL) |  |  | 50 | ppm/mA | -10mA < ILOAD < 10mA, VIN = VOUT + 0.75V, TA = -40°C 至 125°C（3） | 6 |
| Thermal hysteresis, high grade SOP-8, cycle 1 |  |  |  | 70 | ppm | 高等级 SOP-8 周期 1 | 6 |
| Thermal hysteresis, high grade SOP-8, cycle 2 |  |  |  | 50 | ppm | 高等级 SOP-8 周期 2 | 6 |
| Long-term stability, SOP-8, 0 to 1000 hours |  |  |  | 100 | ppm/1000 小时 | SOP-8 0 到 1000 小时 | 6 |
| Long-term stability, SOP-8, 1000 to 2000 hours |  |  |  | 50 | ppm/1000 小时 | SOP-8 1000 到 2000 小时 | 6 |
| Quiescent current |  |  | 0.8 | 1 | mA |  | 6 |
| Quiescent current over temperature |  |  |  | 1.2 | mA | TA = -40°C 至 125°C | 6 |
| Supply voltage Vs | Vs |  |  | 18 | V | 请参阅注释; printed minimum is the expression VOUT +0.2 (not converted) | 6 |
| Specified temperature range |  | -40 |  | 125 | °C | 指定的范围 | 6 |
| Operating temperature range |  | -55 |  | 125 | °C | 工作范围 | 6 |
| Input voltage VIN (recommended) | VIN | 2.7 |  | 18 | V | Minimum 2.7 V except LHR3020 (note 1); table cell also prints VOUT + 0.2V | 5 |
| Output current IOUT | IOUT | -10 |  | 10 | mA |  | 5 |
| Input voltage (absolute maximum) |  | -0.2 |  | 18 | V |  | 4 |
| Output short to GND |  | 0 |  | 30 | mA |  | 4 |
| Output voltage range |  | -0.2 |  | 5.5 | V |  | 4 |
| Operating temperature (absolute maximum) |  | -55 |  | 125 | °C |  | 4 |
| Junction temperature TJ max | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| ESD human body model (HBM) | V(ESD) | -3000 |  | 3000 | V | ANSI/ESDA/JEDEC JS-001 | 5 |
| ESD charged device model (CDM) | V(ESD) | -1000 |  | 1000 | V | JEDEC JESD22-C101 | 5 |
| Output voltage noise |  |  | 1.5 |  | µVPP/V | F = 0.1 Hz 至 10 Hz | 5 |
| Short-circuit current | ISC |  | 25 |  | mA | VOUT = 0 (no supply-to-output short when VS > 5.5V) | 6 |
| TEMP pin output voltage |  |  | 668 |  | mV | TA = 25°C | 6 |
| TEMP pin temperature sensitivity |  |  | 1.91 |  | mV/°C | TA = -40°C 至 125°C | 6 |
| Thermal resistance junction-to-ambient RθJA (SOP-8) | RθJA |  | 160.9 |  | °C/W | DGK (SOP) 8-pin column | 5 |
| Thermal resistance junction-to-case top RθJC(top) (SOP-8) | RθJC(top) |  | 53.9 |  | °C/W | DGK (SOP) 8-pin column | 5 |
| Thermal resistance junction-to-board RθJB (SOP-8) | RθJB |  | 82.3 |  | °C/W | DGK (SOP) 8-pin column | 5 |
| Junction-to-top characterization ψJT (SOP-8) | ψJT |  | 5.1 |  | °C/W | DGK (SOP) 8-pin column | 5 |
| Junction-to-board characterization ψJB (SOP-8) | ψJB |  | 80.7 |  | °C/W | DGK (SOP) 8-pin column | 5 |

## CAD (KiCad official)

- Symbol: `LHR3025AFAA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `lhr3025afaa-etched.step` / `lhr3025afaa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lhr3025afaa.step` / `lhr3025afaa.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Legendsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603080270383886336) (14 pp, sha256 `a5ef983cd4f79fdb`, 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/lhr3025afaa-datasheet.pdf)