# VA2101CSG9

**VIVA(昱盛)** · Audio Amplifiers · WLCSP-9

VA2101CSG9 from VIVA(昱盛), in a WLCSP-9. 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 |
|---|---|---|---|
| A1 | INP | input | Positive audio signal input of the differential pair; the datasheet limits its input voltage to 0 to VDD. |
| C1 | INN | input | Negative audio signal input of the differential pair; the datasheet limits its input voltage to 0 to VDD. |
| C2 | SD_B | input | Active-low shutdown control; it should be held high during normal operation, and pulling it low or leaving it floating mutes the outputs and puts the amplifier in its low-current state. |
| C3 | OUTP | output | Positive BTL (bridge-tied load) output, which drives the speaker together with OUTN. |
| A3 | OUTN | output | Negative BTL (bridge-tied load) output, which drives the speaker together with OUTP. |
| B1 | VDD | power_in | Power supply pin; the supply range is 2.8 V to 5.5 V and this pin is one of two VDD balls that must be decoupled close to the package. |
| B2 | VDD | power_in | Power supply pin; the supply range is 2.8 V to 5.5 V and this pin is one of two VDD balls that must be decoupled close to the package. |
| A2 | GND | power_in | Power ground pin for the amplifier output stage and supply return. |
| B3 | GND | power_in | Power ground pin for the amplifier output stage and supply return. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | VIVA(昱盛) |
| Package | WLCSP-9 |
| Category | Amplifiers/Comparators |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (absolute) | VDD | -0.3 |  | 6 | V |  | 3 |
| Input voltage | VI | 0 |  |  | V | RINN, RINP, LINN, LINP, SD_B; printed as 0 to VDD (max not numeric) | 3 |
| Operating free-air temperature range | TA | -40 |  | 85 | oC |  | 3 |
| Operating junction temperature range | TJ | -40 |  | 150 | oC | Footnote (*2) applies as printed | 3 |
| Storage temperature range | TSTG | -65 |  | 150 | oC |  | 3 |
| Minimum load resistance | R(LOAD) | 3 |  |  | Ω |  | 3 |
| Electrostatic discharge, human body model |  | -2 |  | 2 | kV | Human body model; printed ±2 kV | 3 |
| Electrostatic discharge, machine model |  | -200 |  | 200 | V | Machine model; printed ±200 V | 3 |
| Supply voltage (operating) | VDD | 2.8 |  | 5.5 | V |  | 3 |
| High level input voltage (SD_B) | VIH | 2 |  |  | V | SD_B; VDD=5V; printed max is VDD (not numeric) | 3 |
| Low level input voltage (SD_B) | VIL |  |  | 0.4 | V | SD_B; VDD=5V | 3 |
| External input resistor | RI | 15 |  |  | kΩ | GAIN≤20V/V | 3 |
| PWM carrier frequency | fOSC | 220 |  | 300 | kHz | VDD=5V | 3 |
| Common mode input voltage range | VIC | 0.5 |  |  | V | VDD=2.8V~5.5V, CMRR≤-49dB; printed max is VDD-0.8 (not numeric) | 3 |
| Output offset voltage (measured differentially) | /VOS/ |  | 1 | 25 | mV | VI=0V, AV=20dB, RL=8Ω | 4 |
| High-level input current | /IIH/ |  |  | 100 | μA | VDD=5.5V, VI=5.8V | 4 |
| Low-level input current | /IIL/ |  |  | 5 | μA | VDD=5.5V, VI=-0.3V | 4 |
| DC supply rejection ratio | /PSRR/ | 55 | 75 |  | dB | VDD=4.5V to 5.5V, Gain=20dB | 4 |
| Common mode rejection ratio | /CMRR/ | 49 | 68 |  | dB | VDD = 2.8 to 5.5V, VIC = 0.5V to VDD-0.8V | 4 |
| Quiescent current | IDD |  | 5 | 6.2 | mA | VDD=5.5V, no load | 4 |
| Quiescent current | IDD |  | 4 | 5 | mA | VDD=3.6V | 4 |
| Quiescent current | IDD |  | 3.5 | 4 | mA | VDD=3.0V | 4 |
| Supply current in shutdown mode | IDD(SHUTDOWN) |  | 0.5 | 2 | μA | SD_B=0.4V, VDD=2.8V~5.5V | 4 |
| Drain-source ON resistance, high side | RDS(ON) |  | 450 | 600 | mΩ | VDD=5V, IOUT=500mA | 4 |
| Drain-source ON resistance, low side | RDS(ON) |  | 450 | 600 | mΩ | VDD=5V, IOUT=500mA | 4 |
| Amplifier gain (printed as 285k/RI, 300k/RI, 325k/RI) | A | 285 | 300 | 325 | kΩ/RI | VDD = 2.8 to 5.5V; gain in V/V equals printed value divided by RI | 4 |
| Input impedance | ZI | 141 | 150 | 159 | kΩ |  | 5 |

## CAD (KiCad official)

- Symbol: `VA2101CSG9`
- Footprint: `Package_CSP:WLCSP-9_1.21x1.22mm_Layout3x3_P0.4mm`
- 3D model: WLCSP-9 (KiCad packages3D, STEP)
- 3D model files: `va2101csg9-etched.step` / `va2101csg9-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `va2101csg9.step` / `va2101csg9.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [VIVA(昱盛) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602767272217747456) (15 pp, sha256 `fe1091f67289e19f`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/va2101csg9-datasheet.pdf)