ISO1211

@@ -0,0 +1,51 @@+# ISO1211++**Texas Instruments** · Isolated digital input · SOIC-8++Takes a 24 V industrial field signal and turns it into a clean logic level for a controller, meeting the IEC 61131-2 Type 1, 2, and 3 digital-input specs so it behaves like a proper PLC input. A single external resistor sets the input current threshold, which cuts the power that a resistor-divider input would burn, and the input has defined switching thresholds and hysteresis for noisy field wiring. It pairs with an isolator for a fully isolated channel. A building block for PLC and industrial I/O modules.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VCC1 | power_in | Power supply, side 1 (logic/controller side). Operating range 2.25V to 5.5V; supports 2.5V, 3.3V, and 5V controllers. Absolute max 6V. |+| 2 | EN | input | Output enable. OUT is enabled when EN is high or open; OUT is high-impedance when EN is low. In noisy applications, tie EN to VCC1. |+| 3 | OUT | output | Channel output (logic-side digital output representing the field-side input state). Push-pull, referenced to VCC1/GND1. IOH up to -4mA (VCC1=5V); IOL up to 4mA (VCC1=5V). |+| 4 | GND1 | power_in | Ground connection for VCC1 (logic/controller side ground reference). |+| 5 | SUB | passive | Internal connection to input chip substrate. For good thermal performance, connect this pin to a small 2mm x 2mm floating plane on the board. Do NOT connect this floating plane to FGND or any other signal or plane. |+| 6 | FGND | power_in | Field-side ground reference for the isolated field input. |+| 7 | IN | input | Field-side current input. Accepts 9V to 300V DC/AC digital input signals through an external current-limit resistor; ±60V absolute rating with reverse polarity protection. |+| 8 | SENSE | input | Field-side voltage sense pin. Used together with IN pin and external resistors to set the accurate current limit for IEC 61131-2 Type 1/2/3 compliance. Minimum pulse width at SENSE is 150ns. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Digital-input receiver (24 V field) |+| Standard | IEC 61131-2 Type 1 / 2 / 3 |+| Current setting | Single external resistor |+| Input | Defined thresholds + hysteresis |+| Output | Logic level (OUT) |+| Supply | 2.25-5.5 V (logic side) |+| Package | SOIC-8 |++## Ordering variants++- `ISO1211DR (SOIC-8)`+- `ISO1212DR (dual channel)`++## CAD (KiCad official)++- Symbol: `Isolator:ISO1211 (KiCad official)`+- 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:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/iso1211.pdf) (47 pp, sha256 `41e0bc7308dd4e0c`, retrieved 2026-08-17, tier: manufacturer)+- **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/iso1211-datasheet.pdf)

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