# HT2122ARTZ

**HTCSEMI** · Battery Management · SOT-23-6

HT2122ARTZ from HTCSEMI, in a SOT-23-6. 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 | OD | output | Discharge-control MOSFET gate drive terminal. Drives the gate of the external N-channel discharge FET. High (~VDD-0.02 V) in normal state, pulled low (~0.2 V) to open the discharge path when an overdischarge or discharge-overcurrent event is detected. |
| 2 | OC | output | Charge-control MOSFET gate drive terminal. Drives the gate of the external N-channel charge FET. High (~VDD-0.02 V) in normal state, pulled low (~0.2 V) to open the charge path when an overcharge or charge-overcurrent event is detected. High level is pulled up to VDD; low level is pulled down to CS. |
| 3 | CS | input | Current-sense / charger-detect input terminal. Senses the voltage drop across the external charge/discharge MOSFETs to detect overcurrent, load short circuit, and charger insertion. High-voltage tolerant input, absolute max rating VDD-33 V to VDD+0.3 V (33 V tolerant). |
| 4 | VC | input | Cell balance / intermediate tap sense terminal. Connects to the negative terminal of battery cell 1 and the positive terminal of battery cell 2, allowing per-cell voltage monitoring of the 2-series LiFePO4 pack. Typically connected via a 330 Ω series resistor and 0.1 uF decoupling capacitor. |
| 5 | VDD | power_in | Positive supply input; connects to the positive terminal of battery cell 1 (top of the 2S stack). VDD-VSS operating range 1.5 V to 10 V, absolute max VSS-0.3 V to VSS+10 V. Typical operating current 5 uA, max 9 uA at VDD=6.4 V. |
| 6 | GND | power_in | Ground / negative supply input (VSS). Connects to the negative terminal of battery cell 2 (bottom of the 2S stack). Reference for all internal detection thresholds. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `HT2122ARTZ`

## CAD (KiCad official)

- Symbol: `HT2122ARTZ`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ht2122artz-etched.step` / `ht2122artz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht2122artz.step` / `ht2122artz.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [HTCSEMI datasheet](docs/ht2122artz-datasheet.pdf) (15 pp, sha256 `9442df04ff3e893e`, 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/ht2122artz-datasheet.pdf)