# XTR106UA

**Texas Instruments** · Special Purpose Amplifiers · SOIC-14

XTR106UA from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VREG | power_out | 5.1V regulator output. Provides regulated supply for external circuitry powered from the loop. |
| 2 | VIN- | input | Negative (inverting) differential voltage input to the instrumentation amplifier front end. |
| 3 | RG | passive | Input-stage gain-setting pin. External resistor RG between pins 3 and 4 sets the voltage-to-current transfer gain (S = 40 / RG A/V). |
| 4 | RG | passive | Input-stage gain-setting pin. External resistor RG between pins 3 and 4 sets the voltage-to-current transfer gain. |
| 5 | VIN+ | input | Positive (non-inverting) differential voltage input to the instrumentation amplifier front end. |
| 6 | IRET | input | Local ground return pin for VREG, VREF5, and VREF2.5. Sinks the reference/regulator quiescent currents back through the loop. |
| 7 | IO | output | Regulated 4mA to 20mA current-loop output. Drives the external NPN pass transistor via B/E to modulate loop current. |
| 8 | E | input | Emitter connection for the external NPN pass transistor (e.g., TIP29C) used in the loop current output stage. |
| 9 | B | output | Base drive for the external NPN pass transistor in the loop current output stage. |
| 10 | V+ | power_in | Loop supply input. Operating range 7.5V to 36V (absolute maximum 40V), referenced to the IO pin. |
| 11 | RLIN | passive | Linearization resistor pin. External resistor between pins 1 (VREG) and 11 sets the correction coefficient of the bridge linearization circuit. |
| 12 | Lin Polarity | input | Linearization polarity select. Tie to IRET for positive-going nonlinearity correction, or to VREG for negative-going correction / linearization disabled. |
| 13 | VREF2.5 | power_out | 2.5V precision reference / bridge excitation output. |
| 14 | VREF5 | power_out | 5V precision reference / bridge excitation output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Amplifiers/Comparators |
| Pins | 14 |

## Ordering variants

Same part, different packaging or reel option.

- `XTR106UAU`
- `XTR106UA`
- `XTR106UAP`
- `XTR106UAPA`

## CAD (KiCad official)

- Symbol: `XTR106UA`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `xtr106ua-etched.step` / `xtr106ua-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xtr106ua.step` / `xtr106ua.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/xtr106) (37 pp, sha256 `52ca45d5b4d5d2e1`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/xtr106ua-datasheet.pdf)