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MS321

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Hangzhou Ruimeng Tech Operational Amplifier, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentop-amp-cmpms321
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Contents

README

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MS321

Hangzhou Ruimeng Tech · Operational Amplifier · SOT-23-5

MS321 from Hangzhou Ruimeng Tech, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 +IN input Non-inverting analog input of the op-amp. Common-mode range extends from -0.3 V (V-) up to (V+ - 1.5 V). Input bias current typically 30 nA.
2 V- power_in Negative supply / ground pin. Tie to GND for single-supply operation, or to the negative rail for split supplies. Total supply range V+ minus V- is 2.5 V to 36 V (absolute max 40 V).
3 -IN input Inverting analog input of the op-amp. Input offset voltage typically 3 mV (7 mV max at 25 degC). Input offset current typically 5 nA.
4 OUTPUT output Op-amp output. Class-A/B output stage sources up to ~30 mA and sinks ~8 mA typical. Short-circuit current to GND ~30 mA (typ) with V+ <= 15 V.
5 V+ power_in Positive supply pin. Operating range 2.5 V to 36 V (absolute max 40 V between V+ and V-). Bypass with 0.1 uF close to the pin to reduce noise coupling.

Key specifications

Parameter Value
Manufacturer Hangzhou Ruimeng Tech
Package SOT-23-5
Category Op-amp/Cmp
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • MS321
  • MS321MS358
  • MS324
  • MS324N

CAD (KiCad official)

  • Symbol: MS321
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: ms321-etched.step / ms321-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ms321.step / ms321.glb are the bare package body.

Provenance

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

  • Datasheet: Hangzhou Ruimeng Tech datasheet (14 pp, sha256 fdcf8a1a1925c383, retrieved 2026-08-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF