# LM4819MMX

**Texas Instruments** · Audio Amplifiers · VSSOP-8

LM4819MMX from Texas Instruments, in a VSSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SHUTDOWN | input | Active-high logic input that activates micro-power shutdown when driven toward VDD (VSDIH ≥ 4.0 V min at 5 V, VSDIL ≤ 1.0 V max; threshold typ 1/2 VDD); shutdown current typ 0.7 µA; must not be left floating. |
| 2 | BYPASS | passive | Internal half-supply bias bypass pin; an external capacitor CB (≥ 1.0 µF recommended) to GND filters the reference and sets amplifier turn-on time (TON ≈ 2 s with CB = 1.0 µF). |
| 3 | +IN | input | Non-inverting signal input to the first internal amplifier; input voltage range −0.3 V to VDD + 0.3 V; AC-coupled via input capacitor Ci and input resistor Ri. |
| 4 | -IN | input | Inverting signal input to the first internal amplifier; gain-setting feedback resistor RF and input resistor Ri connect here to set closed-loop differential gain AVD = 2(RF/Ri). |
| 5 | Vo2 | output | Bridge output of the second (inverting) internal amplifier, 180° out of phase with Vo1; one end of the speaker load connects between Vo1 and Vo2; output offset voltage typ 5 mV, max 50 mV. |
| 6 | GND | power_in | Ground reference pin; all voltages measured with respect to this pin; supply bypassing capacitors should be placed as close as possible to the device with their ground returns here. |
| 7 | VDD | power_in | Power supply pin; operating range 2.0 V to 5.5 V (abs max 6.0 V); quiescent current typ 1.5 mA, max 3.0 mA at 5 V; bypass with 0.1 µF and 10 µF capacitors to GND placed close to the device. |
| 8 | Vo1 | output | Bridge output of the first (non-inverting) internal amplifier; drives the load differentially with Vo2; rated 350 mW into 16 Ω or 300 mW into 8 Ω at 10% THD+N from a 5 V supply. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Quiescent Power Supply Current (VDD = 5V) | IDD |  | 1.5 | 3 | mA | VDD = 5V; VIN = 0V, Io = 0A | 4 |
| Quiescent Power Supply Current (VDD = 3V) | IDD |  | 1 | 3 | mA | VDD = 3V; VIN = 0V, Io = 0A | 4 |
| Shutdown Current (VDD = 5V) | ISD |  | 1 | 5 | µA | VDD = 5V; VPIN1 = VDD | 4 |
| Shutdown Current (VDD = 3V) | ISD |  | 0.7 | 5 | µA | VDD = 3V; VPIN1 = VDD | 4 |
| Shutdown Voltage Input High (VDD = 5V) | VSDIH | 4 |  |  | V | VDD = 5V | 4 |
| Shutdown Voltage Input Low (VDD = 5V) | VSDIL |  |  | 1 | V | VDD = 5V | 4 |
| Shutdown Voltage Input High (VDD = 3V) | VSDIH | 2.4 |  |  | V | VDD = 3V | 4 |
| Shutdown Voltage Input Low (VDD = 3V) | VSDIL |  |  | 0.6 | V | VDD = 3V | 4 |
| Output Offset Voltage (VDD = 5V) | VOS |  | 5 | 50 | mV | VDD = 5V; VIN = 0V | 4 |
| Output Offset Voltage (VDD = 3V) | VOS |  | 5 | 50 | mV | VDD = 3V; VIN = 0V | 4 |
| Supply Voltage |  |  |  | 6 | V |  | 3 |
| Input Voltage |  | -0.3 |  |  | V | Upper limit printed as VDD +0.3V | 3 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Soldering Information, Vapor Phase |  |  |  | 215 | °C | Small outline package, vapor phase, 60 seconds | 3 |
| Soldering Information, Infrared |  |  |  | 220 | °C | Small outline package, infrared, 15 seconds | 3 |
| ESD Susceptibility (Human Body Model) |  |  |  | 3.5 | kV | Human body model, 100pF discharged through 1.5 kΩ | 3 |
| ESD Susceptibility (Machine Model) |  |  |  | 250 | V | Machine model, 220pF-240pF discharged through all pins | 3 |
| Operating Temperature Range | TA | -40 |  | 85 | °C |  | 3 |
| Supply Voltage | VCC | 2 |  | 5.5 | V |  | 3 |
| Thermal Resistance Junction-to-Case (VSSOP) | θJC |  | 56 |  | °C/W | VSSOP package | 3 |
| Thermal Resistance Junction-to-Ambient (VSSOP) | θJA |  | 210 |  | °C/W | VSSOP package, typical when board mounted | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | (6) Machine Model, 220pF-240pF capacitor is discharged through all pins. (7) The given θJA is for an LM4819 package in an NGL0008B with the Exposed-DAP soldered to a printed circuit board copper pad w | 3 |

## CAD (KiCad official)

- Symbol: `LM4819MMX`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm4819mmx-etched.step` / `lm4819mmx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4819mmx.step` / `lm4819mmx.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm4819) (31 pp, sha256 `c76a582050c5d98c`, retrieved 2026-10-20, tier: lcsc)
- **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/lm4819mmx-datasheet.pdf)