# AD8428BRZ

**Analog Devices** · Instrumentation OpAmps · SOIC-8

AD8428BRZ 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 | -IN | input | Negative input terminal; voltage must not exceed ±VS and differential input is limited to ±1 V without protection resistors. |
| 2 | -FIL | passive | Negative filter terminal giving access between R3 and R4 of the internal node between first and second stages; voltage must not exceed ±VS. |
| 3 | +FIL | passive | Positive filter terminal giving access between R5 and R6 of the internal node between first and second stages; voltage must not exceed ±VS. |
| 4 | +IN | input | Positive input terminal; voltage must not exceed ±VS and differential input is limited to ±1 V without protection resistors. |
| 5 | -VS | power_in | Negative power supply terminal for a supply range of ±4 V to ±18 V, decoupled with a 0.1 µF capacitor close to the pin. |
| 6 | REF | input | Reference voltage terminal to be driven from a low impedance source (well below 1 Ω) to level-shift the output, and should not exceed +VS or -VS. |
| 7 | OUT | output | Output terminal with short-circuit current of 30 mA and indefinite short-circuit duration. |
| 8 | +VS | power_in | Positive power supply terminal for a supply range of ±4 V to ±18 V, decoupled with a 0.1 µF capacitor close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-8 |
| Category | Amplifiers |
| 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 |
|---|---|---|---|---|---|---|---|
| CMRR DC to 60 Hz | CMRR | 140 |  |  | dB | RTI, VCM = ±10 V, DC to 60 Hz | 3 |
| CMRR at 50 kHz | CMRR | 120 |  |  | dB | RTI, VCM = ±10 V, At 50 kHz | 3 |
| Voltage noise 1 kHz |  |  | 1.3 | 1.5 | nV/√Hz | f = 1 kHz, VIN+, VIN− = 0 V | 3 |
| Voltage noise 0.1-10 Hz |  |  | 40 | 50 | nV p-p | f = 0.1 Hz to 10 Hz | 3 |
| Input offset voltage | VOSI |  |  | 25 | μV |  | 3 |
| Offset average TC |  |  |  | 0.3 | μV/°C | TA = −40°C to +85°C | 3 |
| Offset RTI vs. supply (PSRR) | PSRR | 130 |  |  | dB |  | 3 |
| Input bias current |  |  |  | 50 | nA |  | 3 |
| Input bias current over temperature |  |  |  | 250 | pA/°C | TA = −40°C to +85°C | 3 |
| Input offset current |  |  |  | 10 | nA |  | 3 |
| Input offset current over temperature |  |  |  | 20 | pA/°C | TA = −40°C to +85°C | 3 |
| Slew rate |  | 40 | 50 |  | V/μs |  | 3 |
| Total gain error |  |  |  | 0.05 | % | VOUT = −10 V to +10 V | 3 |
| Total gain nonlinearity |  |  |  | 5 | ppm | VOUT = −10 V to +10 V | 3 |
| Gain drift |  |  |  | 5 | ppm/°C |  | 3 |
| Operating supply range |  | -18 |  | 18 | V | Power supply operating range, printed ±4 to ±18 V (min magnitude ±4 V) | 4 |
| Quiescent current | IQ |  | 6.5 | 6.8 | mA |  | 4 |
| Quiescent current over temperature | IQ |  |  | 8 | mA | TA = −40°C to +85°C | 4 |
| Current noise 1 kHz |  |  | 1.5 |  | pA/√Hz | f = 1 kHz | 3 |
| Current noise 0.1-10 Hz |  |  | 150 |  | pA p-p | f = 0.1 Hz to 10 Hz | 3 |
| -3 dB small signal bandwidth |  |  | 3.5 |  | MHz |  | 3 |
| Settling time to 0.01% |  |  | 0.75 |  | μs | 10 V step | 3 |
| Settling time to 0.001% |  |  | 1.4 |  | μs | 10 V step | 3 |
| Short-circuit current |  |  | 30 |  | mA |  | 3 |
| Reference input impedance | RIN |  | 132 |  | kΩ |  | 3 |
| Reference input current | IIN |  | 6.5 |  | μA | VIN+, VIN− = 0 V | 3 |
| Reference gain error |  |  | 0.01 |  | % |  | 3 |
| Filter terminal input impedance | RIN2 |  | 6 |  | kΩ |  | 4 |
| Supply voltage |  | -18 |  | 18 | V | printed ±18 V | 5 |
| Differential input voltage |  | -1 |  | 1 | V | printed ±1 V | 5 |
| Storage temperature range |  | -65 |  | 150 | °C |  | 5 |
| Specified temperature range |  | -40 |  | 85 | °C |  | 5 |
| Maximum junction temperature |  |  |  | 140 | °C |  | 5 |
| ESD Human Body Model |  |  |  | 5000 | V |  | 5 |
| ESD Charged Device Model |  |  |  | 1250 | V |  | 5 |
| ESD Machine Model |  |  |  | 400 | V |  | 5 |
| Thermal resistance junction to ambient | θJA |  | 121 |  | °C/W | 8-Lead SOIC_N | 5 |

## CAD (KiCad official)

- Symbol: `AD8428BRZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ad8428brz-etched.step` / `ad8428brz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ad8428brz.step` / `ad8428brz.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/AD8428.pdf) (20 pp, sha256 `f7db8276c5d1682a`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ad8428brz-datasheet.pdf)