# THS4121IDGKR

**Texas Instruments** · Differential Amplifiers · MSOP-8

THS4121IDGKR from Texas Instruments, in a MSOP-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 | VIN− | power_in | Inverting differential input of the THS4121 fully differential amplifier, with the feedback network setting the gain (A = Rf/Rg). |
| 2 | VOCM | input | Output common-mode voltage input that sets the common-mode level of the differential outputs; VOCM symmetry must be maintained for proper operation. |
| 3 | VDD | power_in | Positive supply pin; the datasheet specifies VDD = 3.3 V operation and an absolute maximum supply of 3.6 V (GND to VDD). |
| 4 | VOUT+ | output | Non-inverting differential output; for capacitive loads above 10 pF, a series output resistor of at least 20 Ω is recommended. |
| 5 | VOUT− | output | Inverting differential output; for capacitive loads above 10 pF, a series output resistor of at least 20 Ω is recommended. |
| 6 | GND | power_in | Ground reference pin for the amplifier supply (supply is specified as GND to VDD). |
| 7 | NC | unconnected | No internal connection on the THS4121; leave unconnected (the THS4120 uses this position for PD, which is not present on the THS4121). |
| 8 | VIN+ | power_in | Non-inverting differential input of the THS4121 fully differential amplifier, with the feedback network setting the gain (A = Rf/Rg). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `THS4121IDGKR`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ths4121idgkr-etched.step` / `ths4121idgkr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ths4121idgkr.step` / `ths4121idgkr.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/ths4121) (37 pp, sha256 `705c359dabda7e27`, retrieved 2026-10-08, tier: lcsc)
- **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/ths4121idgkr-datasheet.pdf)