# BL6281GSO

**BL(Shanghai Belling)** · Audio Amplifiers · SOP-8

BL6281GSO from BL(Shanghai Belling), in a SOP-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 | SHD | input | Shut-down logical control where logic '0' is active. |
| 2 | BP | bidirectional | Analog ground for the inner OPAs at about half of VDD, filtered by the Cb bypass capacitor. |
| 3 | INP | input | Positive input of the amplifier. |
| 4 | INN | input | Negative (inverting) input of the amplifier. |
| 5 | Vout1 | output | Negative BTL output. |
| 6 | VDD | power_in | Power supply, 2.2 V to 5.5 V. |
| 7 | GND | power_in | Ground. |
| 8 | Vout2 | output | Positive BTL output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BL(Shanghai Belling) |
| Package | SOP-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, 8Ω load) | IDD |  | 3.5 | 8 | mA | VDD=5V; VIN = 0V, 8Ω Load | 4 |
| Quiescent Power Supply Current (VDD=5V, no load) | IDD |  | 3 | 7 | mA | VDD=5V; VIN = 0V, No Load | 4 |
| Shutdown Current (VDD=5V) | ISD |  | 0.1 | 2 | uA | VDD=5V; VIN=0V, VSHD=GND, No Load | 4 |
| Output Offset Voltage (VDD=5V) | VOS | -50 | 6 | 50 | mV | VDD=5V | 4 |
| Output Power (VDD=5V) | PO | 0.9 | 1.1 |  | W | VDD=5V; THD+N<=1%, f=1KHz, 8Ω Load | 4 |
| Power Supply Rejection Ratio (VDD=5V, 217Hz) | PSRR | 50 | 60 |  | dB | VDD=5V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217Hz | 5 |
| Power Supply Rejection Ratio (VDD=5V, 1KHz) | PSRR | 51 | 61 |  | dB | VDD=5V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1KHz | 5 |
| Quiescent Power Supply Current (VDD=3V, 8Ω load) | IDD |  | 2.3 | 7 | mA | VDD=3V; VIN = 0V, 8Ω Load | 5 |
| Quiescent Power Supply Current (VDD=3V, no load) | IDD |  | 1.9 | 6 | mA | VDD=3V; VIN = 0V, No Load | 5 |
| Shutdown Current (VDD=3V) | ISD |  | 0.1 | 2 | uA | VDD=3V; VIN=0V, VSHD=GND, No Load | 5 |
| Output Offset Voltage (VDD=3V) | VOS | -50 | 6 | 50 | mV | VDD=3V | 5 |
| Power Supply Rejection Ratio (VDD=3V, 217Hz) | PSRR | 53 | 65 |  | dB | VDD=3V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217Hz | 5 |
| Power Supply Rejection Ratio (VDD=3V, 1KHz) | PSRR | 54 | 66 |  | dB | VDD=3V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1KHz | 5 |
| Output Offset Voltage (VDD=2.6V) | VOS | -50 | 4 | 50 | mV | VDD=2.6V | 5 |
| Power Supply Rejection Ratio (VDD=2.6V, 217Hz) | PSRR | 52 | 64 |  | dB | VDD=2.6V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=217Hz | 5 |
| Power Supply Rejection Ratio (VDD=2.6V, 1KHz) | PSRR | 53 | 65 |  | dB | VDD=2.6V; input terminated with 10Ω, VDDRIPPLE=0.2VP-P, f=1KHz | 5 |
| Supply Voltage (absolute maximum) |  | -0.3 |  | 6 | V |  | 4 |
| Input Voltage (absolute maximum; upper limit printed as VDD+0.3V) |  | -0.3 |  |  | V |  | 4 |
| Junction Temperature (absolute maximum) |  | -40 |  | 150 | ℃ |  | 4 |
| Storage Temperature (absolute maximum) |  | -65 |  | 150 | ℃ |  | 4 |
| Temperature Range (operating) | TA | -40 |  | 85 | ℃ |  | 4 |
| Supply Voltage (operating) | VDD | 2.2 |  | 5.5 | V |  | 4 |
| Thermal Resistance Junction-to-Ambient (SOP8) | θJA |  |  | 184 | ℃/W | SOP8 package | 4 |

## CAD (KiCad official)

- Symbol: `BL6281GSO`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `bl6281gso-etched.step` / `bl6281gso-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl6281gso.step` / `bl6281gso.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BL(Shanghai Belling) datasheet](docs/bl6281gso-datasheet.pdf) (8 pp, sha256 `09147b7f02d917e3`, retrieved 2026-11-04, 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/bl6281gso-datasheet.pdf)