component
BL321
Public Made by Adomby adom
BL Shanghai Belling Operational Amplifier, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
BL321
BL Shanghai Belling · Operational Amplifier · SOT-23-5
BL321 from BL Shanghai Belling, in a SOT-23-5. 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 | +IN | input | Non-inverting input; common-mode range is 0 V to V+ - 1.5 V and the input may go to +25 V without damage but not below -0.3 V. |
| 2 | V- | power_in | Negative supply, or ground in single-supply operation; the total supply (V+ - V-) is limited to 25 V absolute maximum. |
| 3 | -IN | input | Inverting input; common-mode range is 0 V to V+ - 1.5 V and the input may go to +25 V without damage but not below -0.3 V. |
| 4 | OUTPUT | output | Op amp output that can both source and sink current; short circuits to ground are continuous only for V+ of 15 V or less at 25 °C. |
| 5 | V+ | power_in | Positive supply, operating range +3 V to +25 V (25 V absolute maximum for V+ - V-). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BL Shanghai Belling |
| Package | SOT-23-5 |
| Category | Amplifiers/Comparators |
| Pins | 5 |
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 (V+ - V-) | (V+ - V-) | 25 | V | 1 | |||
| Input Voltage | -0.3 | 25 | V | 1 | |||
| Junction Temperature | 150 | ℃ | Note 3 | 1 | |||
| Operating Temperature Range | -40 | 85 | ℃ | 1 | |||
| Storage Temperature Range | -65 | 150 | ℃ | 1 | |||
| Supply Voltage (wide supply range) | V+ | 3 | 25 | V | Per Features: +3V to +25V; Application Summary: minimum 3V at 25°C | 1 | |
| Input Offset Voltage | 2 | 5 | mV | Ta=25℃ (Note 4) | 2 | ||
| Input Bias Current | IIN(+), IIN(-) | 45 | 150 | nA | Ta=25℃, IIN(+) or IIN(-), VCM=0V (Note 5) | 2 | |
| Input Offset Current | IIN(+) - IIN(-) | 3 | 30 | nA | Ta=25℃, IIN(+) - IIN(-), VCM=0V | 2 | |
| Input Common-Mode Voltage Range | VCM | 0 | V | Ta=25℃, V+=25V (Note 6) | 2 | ||
| Supply Current (V+=25V) | 0.4 | 2 | mA | Full temperature range, RL=∞ on all Op Amps, V+=25V | 2 | ||
| Supply Current (V+=5V) | 0.33 | 1.2 | mA | Full temperature range, RL=∞ on all Op Amps, V+=5V | 2 | ||
| Large Signal Voltage Gain | 80 | 100 | V/mV | V+=15V, Ta=25℃, RL≥2kΩ (For Vo=1~11V) | 2 | ||
| Common-Mode Rejection Ratio | CMRR | 70 | 90 | dB | DC, Ta=25℃, VCM=0~V+-1.5V | 2 | |
| Power Supply Rejection Ratio | PSRR | 70 | 85 | dB | DC, Ta=25℃, V+=5~25V | 2 | |
| Output Current Source | IO | 20 | 50 | mA | VIN(+)=1V, VIN(-)=0V, V+=15V, Vo=2V, Ta=25℃ | 2 | |
| Output Current Sink | IO | 4 | 6 | mA | VIN(-)=1V, VIN(+)=0V, V+=15V, Vo=2V, Ta=25℃ | 2 | |
| Output Current Sink (Vo=200mV) | IO | 8 | 45 | µA | VIN(-)=1V, VIN(+)=0V, V+=15V, Vo=200mV, Ta=25℃ | 2 | |
| Short Circuit to Ground | ISC | 40 | 85 | mA | V+=15V, Ta=25℃ (Note 2) | 2 | |
| Output Voltage Swing High (RL=2kΩ) | VOH | 22 | 23 | V | V+=25V, RL=2kΩ | 2 | |
| Output Voltage Swing High (RL=10kΩ) | VOH | 22 | 23.5 | V | V+=25V, RL=10kΩ | 2 | |
| Output Voltage Swing Low | VOL | 20 | mV | V+=5V, RL=10kΩ | 2 | ||
| Amplifier-to-Amplifier Coupling | -120 | dB | Ta=25℃, f=1~20kHz (Input Referred) (Note 7) | 2 | |||
| Thermal Resistance to Ambient | θJA | 265 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
BL321 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
bl321-etched.step/bl321-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bl321.step/bl321.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BL Shanghai Belling datasheet (7 pp, sha256
0e77d7bc522b00de, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# BL321
**BL Shanghai Belling** · Operational Amplifier · SOT-23-5
BL321 from BL Shanghai Belling, in a SOT-23-5. 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 | +IN | input | Non-inverting input; common-mode range is 0 V to V+ - 1.5 V and the input may go to +25 V without damage but not below -0.3 V. |
| 2 | V- | power_in | Negative supply, or ground in single-supply operation; the total supply (V+ - V-) is limited to 25 V absolute maximum. |
| 3 | -IN | input | Inverting input; common-mode range is 0 V to V+ - 1.5 V and the input may go to +25 V without damage but not below -0.3 V. |
| 4 | OUTPUT | output | Op amp output that can both source and sink current; short circuits to ground are continuous only for V+ of 15 V or less at 25 °C. |
| 5 | V+ | power_in | Positive supply, operating range +3 V to +25 V (25 V absolute maximum for V+ - V-). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BL Shanghai Belling |
| Package | SOT-23-5 |
| Category | Amplifiers/Comparators |
| Pins | 5 |
## 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 (V+ - V-) | (V+ - V-) | | | 25 | V | | 1 |
| Input Voltage | | -0.3 | | 25 | V | | 1 |
| Junction Temperature | | | | 150 | ℃ | Note 3 | 1 |
| Operating Temperature Range | | -40 | | 85 | ℃ | | 1 |
| Storage Temperature Range | | -65 | | 150 | ℃ | | 1 |
| Supply Voltage (wide supply range) | V+ | 3 | | 25 | V | Per Features: +3V to +25V; Application Summary: minimum 3V at 25°C | 1 |
| Input Offset Voltage | | | 2 | 5 | mV | Ta=25℃ (Note 4) | 2 |
| Input Bias Current | IIN(+), IIN(-) | | 45 | 150 | nA | Ta=25℃, IIN(+) or IIN(-), VCM=0V (Note 5) | 2 |
| Input Offset Current | IIN(+) - IIN(-) | | 3 | 30 | nA | Ta=25℃, IIN(+) - IIN(-), VCM=0V | 2 |
| Input Common-Mode Voltage Range | VCM | 0 | | | V | Ta=25℃, V+=25V (Note 6) | 2 |
| Supply Current (V+=25V) | | | 0.4 | 2 | mA | Full temperature range, RL=∞ on all Op Amps, V+=25V | 2 |
| Supply Current (V+=5V) | | | 0.33 | 1.2 | mA | Full temperature range, RL=∞ on all Op Amps, V+=5V | 2 |
| Large Signal Voltage Gain | | 80 | 100 | | V/mV | V+=15V, Ta=25℃, RL≥2kΩ (For Vo=1~11V) | 2 |
| Common-Mode Rejection Ratio | CMRR | 70 | 90 | | dB | DC, Ta=25℃, VCM=0~V+-1.5V | 2 |
| Power Supply Rejection Ratio | PSRR | 70 | 85 | | dB | DC, Ta=25℃, V+=5~25V | 2 |
| Output Current Source | IO | 20 | 50 | | mA | VIN(+)=1V, VIN(-)=0V, V+=15V, Vo=2V, Ta=25℃ | 2 |
| Output Current Sink | IO | 4 | 6 | | mA | VIN(-)=1V, VIN(+)=0V, V+=15V, Vo=2V, Ta=25℃ | 2 |
| Output Current Sink (Vo=200mV) | IO | 8 | 45 | | µA | VIN(-)=1V, VIN(+)=0V, V+=15V, Vo=200mV, Ta=25℃ | 2 |
| Short Circuit to Ground | ISC | | 40 | 85 | mA | V+=15V, Ta=25℃ (Note 2) | 2 |
| Output Voltage Swing High (RL=2kΩ) | VOH | 22 | 23 | | V | V+=25V, RL=2kΩ | 2 |
| Output Voltage Swing High (RL=10kΩ) | VOH | 22 | 23.5 | | V | V+=25V, RL=10kΩ | 2 |
| Output Voltage Swing Low | VOL | | | 20 | mV | V+=5V, RL=10kΩ | 2 |
| Amplifier-to-Amplifier Coupling | | | -120 | | dB | Ta=25℃, f=1~20kHz (Input Referred) (Note 7) | 2 |
| Thermal Resistance to Ambient | θJA | | 265 | | ℃ | | 1 |
## CAD (KiCad official)
- Symbol: `BL321`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `bl321-etched.step` / `bl321-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl321.step` / `bl321.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [BL Shanghai Belling datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954906720423936) (7 pp, sha256 `0e77d7bc522b00de`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/bl321-datasheet.pdf)