# ADR291GRZ

**Analog Devices** · Voltage References · SOIC-8

ADR291GRZ from Analog Devices, in a SOIC-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 | NC | unconnected | No connect; the datasheet reserves internal connections at NC pins for manufacturing and says users should not connect anything to them. |
| 2 | VIN | power_in | Input voltage supply; the ADR291 operates from a supply range of 2.8 V to 15 V. |
| 3 | NC | unconnected | No connect; the datasheet reserves internal connections at NC pins for manufacturing and says users should not connect anything to them. |
| 4 | GND | power_in | Ground reference; a bypass capacitor is connected from VOUT to GND in the basic reference configuration. |
| 5 | NC | unconnected | No connect; the datasheet reserves internal connections at NC pins for manufacturing and says users should not connect anything to them. |
| 6 | VOUT | power_out | Reference output voltage of 2.500 V for the ADR291, guaranteed to deliver load currents up to 5 mA. |
| 7 | NC | unconnected | No connect; the datasheet reserves internal connections at NC pins for manufacturing and says users should not connect anything to them. |
| 8 | NC | unconnected | No connect; the datasheet reserves internal connections at NC pins for manufacturing and says users should not connect anything to them. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-8 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VOUT | 2.494 | 2.5 | 2.506 | V | IOUT = 0 mA | 3 |
| Initial Accuracy | VOERR | -6 |  | 6 | mV |  | 3 |
| Initial Accuracy | VOERR | -0.24 |  | 0.24 | % |  | 3 |
| Temperature Coefficient G Grade (TA = -25°C to +85°C) | TCVOUT |  | 10 | 25 | ppm/°C |  | 3 |
| Line Regulation G Grade (TA = 25°C) | ∆VOUT/∆VIN |  | 40 | 125 | ppm/V |  | 3 |
| Load Regulation G Grade (TA = 25°C) | ∆VOUT/∆ILOAD |  | 40 | 125 | ppm/mA |  | 3 |
| Line Regulation G Grade (TA = -25°C to +85°C) | ∆VOUT/∆VIN |  | 50 | 150 | ppm/V |  | 3 |
| Load Regulation G Grade (TA = -25°C to +85°C) | ∆VOUT/∆ILOAD |  | 30 | 150 | ppm/mA |  | 3 |
| Temperature Coefficient G Grade (TA = -40°C to +125°C) | TCVOUT |  | 10 | 30 | ppm/°C |  | 4 |
| Line Regulation G Grade (TA = -40°C to +125°C) | ∆VOUT/∆VIN |  | 70 | 250 | ppm/V |  | 4 |
| Load Regulation G Grade (TA = -40°C to +125°C) | ∆VOUT/∆ILOAD |  | 30 | 300 | ppm/mA |  | 4 |
| Supply Current (TA = 25°C) | IS |  | 9 | 12 | μA | TA = 25°C | 4 |
| Supply Current (TA = -40°C to +125°C) | IS |  | 12 | 15 | μA | -40°C ≤ TA ≤ +125°C | 4 |
| Supply Voltage | VS |  |  | 18 | V |  | 6 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C | T, R, RU packages | 6 |
| Operating Temperature Range | TA | -40 |  | 125 | °C | ADR291/ADR292 | 6 |
| Junction Temperature Range | TJ | -65 |  | 125 | °C | T, R, RU packages | 6 |
| Lead Temperature (Soldering) |  |  |  | 300 | °C | Soldering, 60 sec | 6 |
| Supply Voltage Range | VS | 2.8 |  | 15 | V | ADR291 supply range (Features) | 1 |
| Noise Voltage | eN |  | 8 |  | μV p-p | 0.1 Hz to 10 Hz | 3 |
| Wideband Noise Density | eN |  | 480 |  | nV/√Hz | @ 1 kHz | 3 |
| Long-Term Stability | ∆VOUT |  | 50 |  | ppm | After 1000 hours of operation @ 125°C | 3 |
| Thermal Hysteresis | VOUT-HYS |  | 50 |  | ppm | 8-lead SOIC, 8-lead TSSOP | 4 |
| Junction-to-Ambient Thermal Resistance | θJA |  | 158 |  | °C/W | 8-Lead SOIC (R), worst-case | 6 |
| Junction-to-Case Thermal Resistance | θJC |  | 43 |  | °C/W | 8-Lead SOIC (R) | 6 |

## CAD (KiCad official)

- Symbol: `ADR291GRZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `adr291grz-etched.step` / `adr291grz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `adr291grz.step` / `adr291grz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/ADR291_292.pdf) (20 pp, sha256 `ffe6ab07adedf6a8`, retrieved 2026-10-30, tier: manufacturer)
- **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/adr291grz-datasheet.pdf)