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RS321BKXC5

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Jiangsu RUNIC Tech Operational Amplifier, SOT-353. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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RS321BKXC5

Jiangsu RUNIC Tech · Operational Amplifier · SOT-353

RS321BKXC5 from Jiangsu RUNIC Tech, in a SOT-353. 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 Positive (noninverting) input; signal input pins are diode-clamped to the supply rails and must stay within (V-)-0.5V to (V+)+0.5V, with input currents limited to 10mA when swinging more than 0.5V beyond the rails.
2 V- power_in Negative (lowest) power supply; single-supply operation spans 2.5V to 5.5V with (V+)-(V-) absolute maximum of 7V.
3 -IN input Negative (inverting) input; signal input pins are diode-clamped to the supply rails and must stay within (V-)-0.5V to (V+)+0.5V, with input currents limited to 10mA when swinging more than 0.5V beyond the rails.
4 OUT output Output; output terminals are diode-clamped to the supply rails, and output signals swinging more than 0.5V beyond the rails should be current-limited to ±140mA or less.
5 V+ power_in Positive (highest) power supply; single-supply operation spans 2.5V to 5.5V with (V+)-(V-) absolute maximum of 7V.

Key specifications

Parameter Value
Manufacturer Jiangsu RUNIC Tech
Package SOT-353
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, absolute maximum Vs 7 V Supply, Vs=(V+)-(V-) 3
Signal input pin current -10 10 mA Signal input pin 3
Signal output pin current -140 140 mA Signal output pin 3
Operating temperature range TA -40 125 °C Operating free-air temperature range 3
Junction temperature TJ 150 °C Junction 3
Storage temperature range Tstg -65 150 °C Storage 3
Electrostatic discharge, human-body model V(ESD) -3000 3000 V Human-body model (HBM) 3
Electrostatic discharge, machine model V(ESD) -200 200 V Machine Model (MM) 3
Supply voltage, single-supply Vs 2.5 5.5 V Single-supply 3
Supply voltage, dual-supply Vs 1.25 2.75 V Dual-supply; printed as ±1.25 (MIN) and ±2.75 (MAX) 3
Operating voltage range Vs 2.5 5.5 V 25C 5
Quiescent current per amplifier IQ 85 140 uA 25C 5
Power-supply rejection ratio PSRR 70 75 dB Vs=2.5V to 5.5V, VCM=(V-)+0.5V, 25C 5
Power-supply rejection ratio PSRR 64 dB Vs=2.5V to 5.5V, VCM=(V-)+0.5V, -40C to 125C 5
Input offset voltage Vos -4.5 0.8 4.5 mV VCM=0V to 3.5V, 25C 5
Common-mode voltage range VCM -0.1 5.6 V Vs= 5.5V, 25C 5
Common-mode rejection ratio CMRR 65 85 dB Vs= 5.5V, VCM=-0.1V to 4V, 25C 5
Common-mode rejection ratio CMRR 62 dB Vs= 5.5V, VCM=-0.1V to 4V, -40C to 125C 5
Common-mode rejection ratio CMRR 58 80 dB Vs= 5.5V, VCM=-0.1V to 5.6V, 25C 5
Common-mode rejection ratio CMRR 56 dB Vs= 5.5V, VCM=-0.1V to 5.6V, -40C to 125C 5
Open-loop voltage gain AOL 85 95 dB RL=2KΩ, Vo=0.15V to 4.85V, 25C 5
Open-loop voltage gain AOL 75 dB RL=2KΩ, Vo=0.15V to 4.85V, -40C to 125C 5
Open-loop voltage gain AOL 88 100 dB RL=10KΩ, Vo=0.05V to 4.95V, 25C 5
Open-loop voltage gain AOL 80 dB RL=10KΩ, Vo=0.05V to 4.95V, -40C to 125C 5
Output swing from rail 25 mV RL=2KΩ, 25C 5
Output swing from rail 8 mV RL=10KΩ, 25C 5
Input offset voltage average drift Vos TC 2 uV/C -40C to 125C 5
Junction-to-ambient thermal resistance, SOT353(SC70-5) RϴJA 214.7 °C/W SOT353(SC70-5) package 3
Junction-to-case (top) thermal resistance, SOT353(SC70-5) RϴJC(top) 127.1 °C/W SOT353(SC70-5) package 3
Junction-to-board thermal resistance, SOT353(SC70-5) RϴJB 60 °C/W SOT353(SC70-5) package 3
Junction-to-top characterization parameter, SOT353(SC70-5) ѰJT 33.4 °C/W SOT353(SC70-5) package 3
Junction-to-board characterization parameter, SOT353(SC70-5) ѰJB 59.8 °C/W SOT353(SC70-5) package 3

CAD (KiCad official)

  • Symbol: RS321BKXC5
  • Footprint: Package_TO_SOT_SMD:SOT-353_SC-70-5
  • 3D model: SOT-353 (KiCad packages3D, STEP)
  • 3D model files: rs321bkxc5-etched.step / rs321bkxc5-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rs321bkxc5.step / rs321bkxc5.glb are the bare package body.

Provenance

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

  • Datasheet: Jiangsu RUNIC Tech datasheet (10 pp, sha256 0c34920a86e07131, 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