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RS121XF

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Jiangsu RUNIC Tech Operational Amplifier, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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package.json rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
page.json rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
README.md rs121xf: specified limits as data (metadata.characteristics, 24 rows from the datasheet) · Ray 12d ago
rs121xf-etched.glb rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
rs121xf-etched.step rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
rs121xf-hero.glb rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
rs121xf-hero.overlay.json rs121xf: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 3d ago
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RS121XF

Jiangsu RUNIC Tech · Operational Amplifier · SOT-23-5

RS121XF from Jiangsu RUNIC Tech, 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 OUT output Amplifier output, rail-to-rail, with the short-circuit output current specified at 25 mA.
2 V- power_in Negative supply rail; the part operates from 2.5 V to 5.5 V across V+ to V-, and the absolute maximum V+ to V- is 7.0 V.
3 +IN input Non-inverting input; common-mode range is -0.1 V to 5.6 V with Vs = 5.5 V, and inputs are diode-clamped to the rails, so signals more than 0.5 V beyond the rails must be limited to 10 mA.
4 -IN input Inverting input with the same limits as +IN: common-mode range -0.1 V to 5.6 V at Vs = 5.5 V, and input current limited to 10 mA when swinging more than 0.5 V beyond the rails.
5 V+ power_in Positive supply rail; the part operates from 2.5 V to 5.5 V, and the absolute maximum V+ to V- is 7.0 V.

Key specifications

Parameter Value
Manufacturer Jiangsu RUNIC Tech
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
Operating Voltage Range Vs 2.5 5.5 V 25°C 3
Input Offset Voltage Vos 0.8 5 mV 25°C 3
Input Bias Current IB 1 10 pA 25°C 3
Input Offset Current Ios 1 10 pA 25°C 3
Common-Mode Voltage Range Vcm -0.1 5.6 V Vs=5.5V, 25°C 3
Output Swing From Rail 3 mV RL = 2KΩ, 25°C 3
Output Short-Circuit Current Iout 25 mA 25°C 3
Slew Rate SR 0.05 V/us 25°C 3
Gain-Bandwidth Product GBP 0.15 MHz 25°C 3
Input-Referred Voltage Noise en 77 nV/√Hz f = 1 kHz, 25°C 3
Input-Referred Voltage Noise en 39 nV/√Hz f = 10 kHz, 25°C 3
Quiescent Current/Amplifier IQ 12 uA 25°C 3
Supply Current in Shutdown IQ(OFF) 1 uA 25°C 3
Turn-off time tOFF 3 us 25°C 3
Turn-on time tON 20 us 25°C 3
Shut Down logic-low threshold VL 0.8 V Shut Down, 25°C; referenced to (V-) 3
Amplifier Is Active logic-high threshold VH 2 V Amplifier Is Active, 25°C; referenced to (V-) 3
Input Terminals Voltage -0.5 0.5 V Input terminals; upper limit printed as (V+)+0.5V 2
Input Terminals Current -10 10 mA 2
Storage Temperature -65 150 °C 2
Operating Temperature -40 125 °C 2
Junction Temperature 150 °C 2
Package Thermal Resistance (junction-to-ambient) 200 °C/W SOT23-5, SOT23-6; TA = +25°C 2
Operating Temperature Range -40 125 °C Temperature range per ordering information 2

CAD (KiCad official)

  • Symbol: RS121XF
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: rs121xf-etched.step / rs121xf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rs121xf.step / rs121xf.glb are the bare package body.

Provenance

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

  • Datasheet: Jiangsu RUNIC Tech datasheet (14 pp, sha256 9418922fc6c089ef, retrieved 2026-10-09, 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