# UAF42AU

**Texas Instruments** · ADCs/DACs - Special Purpose · SOIC-16-300mil

UAF42AU from Texas Instruments, in a SOIC-16-300mil. 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 | Low-Pass VO | output | Low-pass filter output of the state-variable filter, with ±11 V typical output swing into 2kΩ on the op amps and ±25 mA short-circuit current. |
| 2 | NC | unconnected | No connection; for best performance connect to ground to minimize inter-lead capacitance. |
| 3 | VIN3 | input | Filter summing input 3 (In3) of the universal active filter, with on-chip 50kΩ ±0.5% resistor. |
| 4 | VIN2 | input | Filter summing input 2 (In2) of the universal active filter, with on-chip 50kΩ ±0.5% resistor. |
| 5 | Auxiliary Op Amp, +In | input | Non-inverting input of the uncommitted FET-input auxiliary op amp, with input bias current 10 pA typical and common-mode range ±11.5 V. |
| 6 | Auxiliary Op Amp, -In | input | Inverting input of the uncommitted FET-input auxiliary op amp, used for additional stages or band-reject and inverse Chebyshev filters. |
| 7 | Auxiliary Op Amp, VO | output | Output of the uncommitted auxiliary op amp, with ±11 V minimum swing into 2kΩ and ±25 mA short-circuit current. |
| 8 | Bandpass VO | output | Band-pass filter output of the state-variable filter. |
| 9 | Frequency Adj1 | passive | Frequency adjust node for the first integrator, where an external resistor sets the natural frequency together with the on-chip 1000pF ±0.5% capacitor. |
| 10 | V- | power_in | Negative supply, operating range -6 V to -18 V (absolute maximum ±18 V). |
| 11 | V+ | power_in | Positive supply, operating range +6 V to +18 V (absolute maximum ±18 V). |
| 12 | Ground | power_in | Ground reference for the filter. |
| 13 | VIN1 | input | Filter summing input 1 (In1) of the universal active filter, with on-chip 50kΩ ±0.5% resistor. |
| 14 | High-Pass VO | output | High-pass filter output of the state-variable filter. |
| 15 | NC | unconnected | No connection; for best performance connect to ground to minimize inter-lead capacitance. |
| 16 | Frequency Adj2 | passive | Frequency adjust node for the second integrator, where an external resistor sets the natural frequency together with the on-chip 1000pF ±0.5% capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Data Acquisition |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `UAF42AU`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `uaf42au-etched.step` / `uaf42au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uaf42au.step` / `uaf42au.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/uaf42) (16 pp, sha256 `47c8145278cd4cf9`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/uaf42au-datasheet.pdf)