# A1326LLHLT-T

**Allegro MicroSystems, LLC** · Magnetic Sensors · SOT-23W

A1326LLHLT-T from Allegro MicroSystems, LLC, in a SOT-23W. 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 | VCC | power_in | Input power supply (4.5 to 5.5 V operating, 8 V absolute maximum); tie to GND with a 0.1 µF bypass capacitor. |
| 2 | VOUT | output | Analog ratiometric output signal (quiescent 50% of VCC), also used for programming; requires load of at least 4.7 kΩ and no more than 10 nF to GND. |
| 3 | GND | power_in | Ground reference for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Allegro MicroSystems, LLC |
| Package | SOT-23W |
| Category | Sensors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Forward Supply Voltage | VCC |  |  | 8 | V |  | 2 |
| Reverse Supply Voltage | VRCC | -0.1 |  |  | V |  | 2 |
| Forward Output Voltage | VOUT |  |  | 15 | V |  | 2 |
| Reverse Output Voltage | VROUT | -0.1 |  |  | V |  | 2 |
| Output Source Current | IOUT(SOURCE) |  |  | 2 | mA | VOUT to GND | 2 |
| Output Sink Current | IOUT(SINK) |  |  | 10 | mA | VCC to VOUT | 2 |
| Operating Ambient Temperature | TA | -40 |  | 150 | ºC | L temperature range | 2 |
| Maximum Junction Temperature | TJ(max) |  |  | 165 | ºC |  | 2 |
| Storage Temperature | Tstg | -65 |  | 170 | ºC |  | 2 |
| Package Thermal Resistance | RθJA |  | 228 |  | ºC/W | Package LH, on 4-layer PCB with copper limited to solder pads | 2 |
| Package Thermal Resistance | RθJA |  | 110 |  | ºC/W | Package LH, on 2-layer PCB with 0.463 in.2 of copper area each side, connected by thermal vias | 2 |
| Supply Voltage | VCC | 4.5 | 5 | 5.5 | V |  | 3 |
| Supply Current | ICC |  | 6.9 | 9 | mA | No load on VOUT | 3 |
| Supply Zener Clamp Voltage | VZ | 6 | 8.3 |  | V | TA = 25°C, ICC = 12 mA | 3 |
| Quiescent Voltage Output | VOUT(Q) | 2.425 | 2.5 | 2.575 | V | B = 0 G, TA = 25°C | 3 |
| Output Load Resistance (VOUT to VCC) | RL | 4.7 |  |  | kΩ | VOUT to VCC | 3 |
| Output Load Resistance (VOUT to GND) | RL | 4.7 |  |  | kΩ | VOUT to GND | 3 |
| Output Load Capacitance | CL |  |  | 10 | nF | VOUT to GND | 3 |
| Output Saturation Voltage High | VOUT(sat)HIGH | 4.7 |  |  | V | RPULLDOWN = 4.7 kΩ, VCC = 5 V | 3 |
| Output Saturation Voltage Low | VOUT(sat)LOW |  |  | 0.3 | V | RPULLUP = 4.7 kΩ, VCC = 5 V | 3 |
| Sensitivity | Sens | 2.375 | 2.5 | 2.625 | mV/G | A1326, TA = 25°C | 3 |
| Sensitivity Drift at Max Ambient Operating Temperature | ∆Sens(TAmax) | -5 |  | 5 | % | LH package; from hot to room temperature | 3 |
| Sensitivity Drift at Min Ambient Operating Temperature | ∆Sens(TAmin) | -3.5 |  | 8.5 | % | LH package; from cold to room temperature | 3 |
| Quiescent Voltage Output Drift Through Temperature Range | ∆VOUT(Q) | -10 |  | 10 | G | Defined in terms of magnetic flux density, B | 4 |
| Linearity Sensitivity Error | LinERR | -1.5 |  | 1.5 | % |  | 4 |
| Symmetry Sensitivity Error | SymERR | -1.5 |  | 1.5 | % |  | 4 |
| Ratiometry Quiescent Voltage Output Error | RatVOUT(Q) | -1.3 |  | 1.3 | % | Throughout supply voltage range (relative to VCC = 5 V) | 4 |
| Ratiometry Sensitivity Error | RatSens | -1.5 |  | 1.5 | % | Throughout supply voltage range (relative to VCC = 5 V), TA = 25°C and 150°C | 4 |
| Ratiometry Sensitivity Error | RatSens | -2 |  | 2 | % | Throughout supply voltage range (relative to VCC = 5 V), TA = -40°C | 4 |
| Power-On Time | tPO |  | 32 |  | µs | TA = 25°C, CL (PROBE) = 10 pF | 3 |
| Internal Bandwidth | BWi |  | 17 |  | kHz | Small signal, -3 dB | 3 |
| Chopping Frequency | fC |  | 400 |  | kHz | TA = 25°C | 3 |
| Output Referred Noise | VN |  | 3.5 |  | mV(p-p) | A1326, TA = 25°C, CBYPASS = 0.1 µF | 3 |
| Input Referred RMS Noise Density | VNRMS |  | 1.3 |  | mG/√Hz | TA = 25°C, CBYPASS = open, no load on VOUT, f << BWi | 3 |
| Sensitivity Temperature Coefficient | TCSens |  | 0 |  | %/°C | LH package; programmed at TA = 150°C, calculated relative to Sens at 25°C | 3 |
| Sensitivity Drift Due to Package Hysteresis | ∆SensPKG |  | 2 |  | % | TA = 25°C, after temperature cycling (printed ±2) | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | (UA), and a 3-pin surface mount SOT-23 style package (LH). Both are lead (Pb) free, with 100% matte tin leadframe plating. | 1 |

## CAD (KiCad official)

- Symbol: `A1326LLHLT-T`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23W (KiCad packages3D, STEP)
- 3D model files: `a1326llhlt-t-etched.step` / `a1326llhlt-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `a1326llhlt-t.step` / `a1326llhlt-t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Allegro MicroSystems, LLC datasheet](docs/a1326llhlt-t-datasheet.pdf) (12 pp, sha256 `0c4fe174d39a19dc`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/a1326llhlt-t-datasheet.pdf)