lm4861mx

@@ -0,0 +1,49 @@+# LM4861MX++**Texas Instruments** · Audio Power OpAmps · SOIC-8++LM4861MX 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 | SHUTDOWN | input | Active-high shutdown control. Drive to VDD to disable the amplifier (typical shutdown current 0.6µA); drive to GND to enable. Must not be left floating - no internal pull-down exists. An external 47kΩ pull-up can be used with a switch to GND to enable. |+| 2 | BYPASS | passive | Half-supply (VDD/2) internal reference bypass node. Connect an external bypass capacitor CB (typ 1.0µF) from this pin to GND to filter the half-supply reference; larger CB improves low-frequency THD+N. |+| 3 | +IN | input | Non-inverting input of the first (gain-configurable) amplifier. Typically tied to the BYPASS (VDD/2) node through a resistor in bridged applications so the amplifier's input is biased at half-supply. |+| 4 | -IN | input | Inverting input of the first amplifier. Closed-loop differential gain is set by Rf/Ri (Avd = 2·Rf/Ri); connect the audio input through a coupling capacitor Ci and series resistor Ri, with feedback resistor Rf from Vo1 to this pin. |+| 5 | Vo1 | output | Output of the first (gain-configurable) amplifier. One side of the bridge-tied load; biased at VDD/2. Drives the 8Ω load differentially with Vo2 (180° out of phase). Delivers up to 1.1W (1% THD+N) into 8Ω at VDD = 5V. |+| 6 | VDD | power_in | Positive supply voltage input, 2.0V to 5.5V operating range (6.0V absolute maximum). Typical quiescent current 6.5mA. Bypass locally with a 0.1µF ceramic capacitor as close as possible to the pin for low-noise operation and high PSRR. |+| 7 | GND | power_in | Ground reference return. All voltages are measured with respect to this pin. |+| 8 | Vo2 | output | Output of the second amplifier, internally fixed at unity gain in an inverting configuration (Av = -1) via two internal 40kΩ resistors. Forms the second half of the bridge-tied load with Vo1; biased at VDD/2 and 180° out of phase with Vo1. In single-ended use, load with a 0.1µF + 2kΩ dummy network for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Op-amp/Cmp |+| Pins | 8 |++## Ordering variants++- `LM4861MX`+- `LM4861MXLM4861M/NOPB`+- `LM4861MX/NOPB`++## CAD (KiCad official)++- Symbol: `LM4861MX`+- 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/lm4861mx.pdf) (None pp, sha256 `d212743516cb9c3a`, 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/lm4861mx-datasheet.pdf)

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