LM397

@@ -0,0 +1,47 @@+# LM397++**Texas Instruments** · Single comparator · SOT-23-5++Single general-purpose comparator with an open-collector output, in a SOT-23-5. It compares the two inputs and pulls OUT low when IN- is above IN+; the open-collector stage needs a pull-up so the output can swing to any rail up to the supply, which makes level shifting and wired-OR easy. A wide 5 to 30 V supply range suits it to higher-voltage industrial thresholds where low-voltage comparators cannot reach. The single-channel member of the LM393/339 family lineage.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VIN- | input | Inverting analog input of the comparator. Common-mode range 0 V to VS - 1.5 V; must not go more than 0.3 V below the negative rail. Input bias current typ 10 nA, offset current typ 1.6 nA. |+| 2 | GND | power_in | Ground / negative supply return. In single-supply operation tied to 0 V; in split-supply operation tied to the negative rail. |+| 3 | VIN+ | input | Noninverting analog input of the comparator. Common-mode range 0 V to VS - 1.5 V; must not go more than 0.3 V below the negative rail. |+| 4 | OUTPUT | output | Open-collector comparator output. Requires an external pull-up resistor to the desired logic rail (e.g., 5.1 kΩ to 5 V typical). Output sink current typ 13 mA (min 6 mA); leakage typ 0.1 nA at VO = 5 V, 1 µA max at VO = 30 V. VOL typ 180 mV at IO = -4 mA. |+| 5 | VS | power_in | Positive supply pin. Single-supply range 5 V to 30 V (or ±15 V split). Supply current typ 250 µA at VS = 5 V, typ 300 µA at VS = 30 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Single comparator (open-collector output) |+| Supply | 5-30 V (single) or +/-15 V |+| Output | Open collector (needs pull-up) |+| Input offset | 5 mV (typ) |+| Response time | ~1.3 us |+| Package | SOT-23-5 |++## Ordering variants++- `LM397MFX (SOT-23-5)`+- `LM397MF (SOT-23-5, tube)`++## CAD (KiCad official)++- Symbol: `Comparator:LM397 (KiCad official)`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (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/lm397.pdf) (19 pp, sha256 `c7a1f660266357ba`, 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/lm397-datasheet.pdf)

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