# ADS7251IRTER

**Texas Instruments** · Analog To Digital Converters (ADC) · WQFN-16-EP(3x3)

ADS7251IRTER from Texas Instruments, in a WQFN-16-EP(3x3). 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 | REFOUT-A | output | Reference voltage output REF_A from the internal reference of ADC channel A. |
| 2 | REFGND-A | power_in | Reference ground potential for channel A, which must stay within 0.3 V of GND (|REFGND_x − GND| ≤ 0.3 V). |
| 3 | REFGND-B | power_in | Reference ground potential for channel B, which must stay within 0.3 V of GND (|REFGND_x − GND| ≤ 0.3 V). |
| 4 | REFOUT-B | output | Reference voltage output REF_B from the internal reference of ADC channel B. |
| 5 | AINM-B | passive | Negative analog input for channel B; AINM_x to REFGND_x must remain between REFGND_x − 0.3 V and AVDD + 0.3 V. |
| 6 | AINP-B | passive | Positive analog input for channel B; AINP_x to REFGND_x must remain between REFGND_x − 0.3 V and AVDD + 0.3 V. |
| 7 | DVDD | power_in | Digital I/O supply, 3.3 V recommended operating voltage; absolute maximum DVDD to GND is −0.3 V to +7 V. |
| 8 | GND | power_in | Digital ground for the device. |
| 9 | CS | input | Active-low chip-select digital input; CS to GND must remain between GND − 0.3 V and DVDD + 0.3 V. |
| 10 | SCLK | input | Serial communication clock digital input; SCLK to GND must remain between GND − 0.3 V and DVDD + 0.3 V. |
| 11 | SDO-A | output | Serial data output for channel A. |
| 12 | SDO-B | output | Serial data output for channel B. |
| 13 | GND | power_in | Digital ground for the device. |
| 14 | AVDD | power_in | ADC analog supply, 5 V recommended operating voltage; absolute maximum AVDD to GND is −0.3 V to +7 V. |
| 15 | AINP-A | passive | Positive analog input for channel A; AINP_x to REFGND_x must remain between REFGND_x − 0.3 V and AVDD + 0.3 V. |
| 16 | AINM-A | passive | Negative analog input for channel A; AINM_x to REFGND_x must remain between REFGND_x − 0.3 V and AVDD + 0.3 V. |
| 17 | Thermal Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-16-EP(3x3) |
| Category | Data Acquisition |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `ADS7251IRTER`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: WQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `ads7251irter-etched.step` / `ads7251irter-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads7251irter.step` / `ads7251irter.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/ads7251) (38 pp, sha256 `6608c6172c7a3e3f`, retrieved 2026-10-08, 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:** 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/ads7251irter-datasheet.pdf)