ACS724LLCTR-20AB-T

@@ -0,0 +1,54 @@+# ACS724LLCTR-20AB-T++**Allegro MicroSystems LLC** · Current Sensors · SOIC-8++ACS724LLCTR-20AB-T from Allegro MicroSystems LLC, in a SOIC-8. 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 | IP+ | passive | Primary current sense input (positive). Tied internally to pin 2 to form the fused primary conductor (~1.2 mΩ) through which the sensed current flows. Current flowing from pins 1,2 to pins 3,4 produces a positive VIOUT slope. |+| 2 | IP+ | passive | Primary current sense input (positive), internally connected to pin 1. Both pins 1 and 2 must be tied together on the PCB to carry the sensed current. |+| 3 | IP- | passive | Primary current sense return (negative). Tied internally to pin 4 to form the fused primary conductor. Sensed current exits through pins 3 and 4. |+| 4 | IP- | passive | Primary current sense return (negative), internally connected to pin 3. Both pins 3 and 4 must be tied together on the PCB. The IP+/IP- terminals are galvanically isolated (2400 VRMS) from the signal-side pins. |+| 5 | GND | power_in | Signal ground terminal. Reference for VCC, VIOUT, and FILTER on the low-voltage side of the isolation barrier. |+| 6 | FILTER | passive | External capacitor pin (CF) that, combined with the ~1.8 kΩ internal filter resistor RF(int), sets the output bandwidth (default 120 kHz small-signal BW with CF = 1 nF). Reduces noise at lower bandwidths. |+| 7 | VIOUT | output | Analog output signal, ratiometric to VCC. Zero-current output ≈ VCC/2; sensitivity 100 mV/A for the ±20 A -20AB variant. Output impedance drives ≥4.7 kΩ load; saturates near VCC-0.3 V (high) / 0.3 V (low). |+| 8 | VCC | power_in | Device power supply terminal. 5 V single supply nominal (4.5 to 5.5 V operating range, 6 V absolute max). Typical supply current ICC = 10 mA. Bypass with 0.1 µF ceramic (CBYPASS) to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Allegro MicroSystems LLC |+| Package | SOIC-8 |+| Category | Sensor |+| Pins | 8 |++## Ordering variants++- `ACS724LLCTR-20AB-TACS724LLCTR-05AB-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-10AU-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-10AB-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-20AU-T`+- `ACS724LLCTR-20AB-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-30AU-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-30AB-T`+- `ACS724LLCTR-20AB-TACS724LLCTR-50AB-T`++## CAD (KiCad official)++- Symbol: `ACS724LLCTR-20AB-T`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Allegro MicroSystems LLC datasheet](docs/acs724llctr-20ab-t-datasheet.pdf) (25 pp, sha256 `1d287313108ead3b`, retrieved 2026-08-17, tier: lcsc)+- **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/acs724llctr-20ab-t-datasheet.pdf)

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