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BL321

Public Made by Adom

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BL Shanghai Belling Operational Amplifier, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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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 (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