LM311

@@ -0,0 +1,52 @@+# LM311++**Texas Instruments** · Precision voltage comparator · SOIC-8++A single high-speed precision voltage comparator in SOIC-8, more flexible than a garden-variety comparator. Its output stage brings out both the transistor collector and emitter separately, so it can switch loads referenced to any level (drive a relay, a lamp, or logic at a different voltage), and a strobe input can force the output off on command. An offset-balance pair trims input offset for precision thresholds. It runs from a single supply or split supplies and drives up to 50 V / 50 mA on the output. Use it for level detection, zero-crossing, oscillators, and interfacing analog to logic.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | EMIT OUT | output | Open-emitter output of the comparator's output transistor. Typically tied to VCC- (ground) or used as the low side of a level-shifted output; combined with COL OUT it forms a floating output that can drive loads referenced to either rail up to 50 V at 50 mA. |+| 2 | IN+ | input | Non-inverting comparator input. Differential input range +/-30 V (VID), single-ended input range must remain within |VI| <= 15 V and within VCC- + 0.5 V to VCC+ - 1.5 V for guaranteed operation. Input bias current typ 100 nA (max 250 nA at 25 C). |+| 3 | IN- | input | Inverting comparator input. Differential and common-mode limits identical to IN+; typical input offset voltage 2 mV, input offset current 6 nA at 25 C. |+| 4 | VCC- | power_in | Negative supply pin. Absolute max -18 V; recommended supply span (VCC+ - VCC-) is 3.5 V to 30 V. In single-supply operation this pin is grounded. |+| 5 | BALANCE | input | Offset-balance trim pin. Connect an external network (typically a potentiometer between BALANCE and BAL/STRB with wiper to VCC+) to null input offset voltage. May be left open when trimming is not required. |+| 6 | BAL/STRB | input | Combined balance / strobe input. When current-driven at -3 mA to -5 mA (per datasheet note: the strobe must not be shorted to ground) the output is forced into the OFF (high-impedance) state regardless of the differential input. Also serves as the second terminal of the offset-balance network. |+| 7 | COL OUT | output | Open-collector output of the comparator's output transistor. Withstands up to 50 V (VCC- + 50 V) with the emitter grounded; sinks up to 50 mA (VOL <= 1.5 V at IOL = 50 mA). Requires an external pull-up resistor for logic-level output. |+| 8 | VCC+ | power_in | Positive supply pin. Absolute max +18 V; recommended supply span (VCC+ - VCC-) is 3.5 V to 30 V. Positive-supply current ICC+ typ 5.1 mA (no load). |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Single precision comparator |+| Output | open-collector (separate emitter + collector) |+| Output rating | 50 V / 50 mA |+| Strobe | yes (force output off) |+| Offset trim | balance pins |+| Response time | ~200 ns |+| Supply | single 5 V or split up to ±15 V |+| Package | SOIC-8 |++## Ordering variants++- `LM311D (SOIC-8, tube)`+- `LM311DR (SOIC-8, tape & reel)`++## CAD (KiCad official)++- Symbol: `Comparator:LM311`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## 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/lm311-datasheet.pdf)

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