LM311DR

@@ -0,0 +1,55 @@+# LM311DR++**Texas Instruments** · Comparators · SOIC-8++LM311DR from Texas Instruments, 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 | EMIT OUT | output | Output emitter of the comparator output transistor. Together with COL OUT forms an isolated output stage that can be referenced to either VCC+ or VCC-. |+| 2 | IN+ | input | Noninverting comparator input. Input voltage magnitude must not exceed |VCC| or ±15 V, whichever is less. |+| 3 | IN- | input | Inverting comparator input. Input voltage magnitude must not exceed |VCC| or ±15 V, whichever is less. |+| 4 | VCC- | power_in | Negative supply rail. Total supply (VCC+ - VCC-) range is 3.5 V to 30 V; absolute max VCC- is -18 V. |+| 5 | BALANCE | input | Offset balance (input offset trim) pin. Used with BAL/STRB for offset nulling via an external trim network. |+| 6 | BAL/STRB | input | Balance/Strobe pin. When pulled low the output is forced to the off state regardless of the differential input, providing an output-disable/strobe function; also used with BALANCE for offset nulling. |+| 7 | COL OUT | output | Output collector of the comparator output transistor (open collector). Can switch loads up to 50 V at 50 mA and be wire-OR connected; voltage from collector to VCC- rated to 40 V (LM311). |+| 8 | VCC+ | power_in | Positive supply rail. Total supply (VCC+ - VCC-) range is 3.5 V to 30 V; absolute max VCC+ is 18 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Amplifiers/Comparators |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `LM311DRD`+- `LM311DR`+- `LM311DRP`+- `LM311DRPW`+- `LM311DRPS`+- `LM311DRJG`+- `LM311DRFK`++## CAD (KiCad official)++- Symbol: `LM311DR`+- 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/lm311.pdf) (42 pp, sha256 `c4f907a0fa591db0`, 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/lm311dr-datasheet.pdf)

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