# MS8312

**Hangzhou Ruimeng Tech** · Precision Op Amps · SOP-8

MS8312 from Hangzhou Ruimeng Tech, in a SOP-8. 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 A | output | Channel A amplifier output, rail-to-rail, short-circuit current typically ±80 mA at 5V supply. |
| 2 | -IN A | input | Channel A inverting input, input voltage range 0 V to Vs (VSS to VDD absolute maximum). |
| 3 | +IN A | input | Channel A non-inverting input, input voltage range 0 V to Vs with 1 pA maximum bias current. |
| 4 | GND | power_in | Negative supply / ground pin of the single-supply op amp. |
| 5 | +IN B | input | Channel B non-inverting input, input voltage range 0 V to Vs with 1 pA maximum bias current. |
| 6 | -IN B | input | Channel B inverting input, input voltage range 0 V to Vs (VSS to VDD absolute maximum). |
| 7 | OUT B | output | Channel B amplifier output, rail-to-rail, short-circuit current typically ±80 mA at 5V supply. |
| 8 | VCC | power_in | Positive supply, 2.7 V to 5.5 V operating, 6 V absolute maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Hangzhou Ruimeng Tech |
| Package | SOP-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## 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 | Vs |  |  | 6 | V |  | 2 |
| Differential input voltage |  | -6 |  | 6 | V |  | 2 |
| Junction temperature range |  | -65 |  | 150 | ℃ |  | 2 |
| Operating temperature | TA | -40 |  | 125 | ℃ |  | 2 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 2 |
| Lead temperature range |  |  |  | 260 | ℃ |  | 2 |
| Input offset voltage | VOS |  | 80 | 300 | uV | Vs=5V，VCM=0V to 5V | 3 |
| Input offset voltage | VOS |  |  | 750 | uV | -40℃≤T≤125℃ | 3 |
| Input bias current | IB |  | 0.2 | 1 | pA |  | 3 |
| Input bias current | IB |  |  | 250 | pA | -40℃≤T≤125℃ | 3 |
| Input offset current | IOS |  | 0.1 | 0.5 | pA |  | 3 |
| Input offset current | IOS |  |  | 75 | pA | -40℃≤T≤125℃ | 3 |
| Common-mode rejection ratio | CMRR | 85 | 100 |  | dB | VCM=0V to 5V | 3 |
| Common-mode rejection ratio | CMRR | 75 | 90 |  | dB | -40℃≤T≤125℃ | 3 |
| Input voltage range |  | 0 |  | 5 | V |  | 3 |
| Large-signal voltage gain | AVO | 115 | 120 |  | dB | RL= 2kΩ, Vo= 0.5V to 4.5V | 3 |
| Input offset voltage drift | △VOS/△T |  | 1.5 | 10 | μV/℃ | -40℃≤T≤125℃ | 3 |
| Output high voltage | VOH | 4.96 | 4.99 |  | V | IL=1mA | 3 |
| Output high voltage | VOH | 4.7 | 4.79 |  | V | IL=10mA | 3 |
| Output high voltage | VOH | 4.7 |  |  | V | -40℃≤T≤125℃ | 3 |
| Output low voltage | VOL |  | 20 | 40 | mV | IL=1mA | 3 |
| Output low voltage | VOL |  | 170 | 210 | mV | IL=10mA | 3 |
| Output low voltage | VOL |  |  | 290 | mV | -40℃≤T≤125℃ | 3 |
| Short-circuit current | ISC | -80 |  | 80 | mA |  | 3 |
| Power supply rejection ratio | PSRR | 85 | 95 |  | dB | 2.7V<VCM <5.5V | 4 |
| Power supply rejection ratio | PSRR | 70 | 90 |  | dB | -40℃≤T≤125℃ | 4 |
| Quiescent current per amplifier | ISY |  |  | 1.8 | mA | -40℃≤T≤125℃ | 4 |
| Settling time to 0.01% | ts |  |  | 1 | us | 0V to 2V step,AV=1 | 4 |
| 1/f noise peak-to-peak | en |  | 2.3 | 3.5 | uV | f=0.1Hz to 10Hz | 4 |
| Input offset voltage | VOS |  | 80 | 300 | uV | Vs=2.7V，VCM=0V to 2.7V | 5 |
| Input offset voltage | VOS |  |  | 750 | uV | -40℃≤T≤125℃ | 5 |
| Input bias current | IB |  | 0.2 | 1 | pA |  | 5 |
| Input bias current | IB |  |  | 250 | pA | -40℃≤T≤125℃ | 5 |
| Input offset current | IOS |  | 0.1 | 0.5 | pA |  | 5 |
| Input offset current | IOS |  |  | 75 | pA | -40℃≤T≤125℃ | 5 |
| Common-mode rejection ratio | CMRR | 115 | 120 |  | dB | VCM=0V to 2.7V | 5 |
| Common-mode rejection ratio | CMRR | 70 | 85 |  | dB | -40℃≤T≤125℃ | 5 |
| Input voltage range |  | 0 |  | 2.5 | V |  | 5 |
| Large-signal voltage gain | AVO | 110 | 118 |  | dB | RL= 2kΩ, Vo= 0.5V to 2.2V | 5 |
| Input offset voltage drift | △VOS/△T |  | 1.5 | 10 | μV/℃ | -40℃≤T≤125℃ | 5 |
| Output high voltage | VOH | 2.6 | 2.66 |  | V | IL=1mA | 5 |
| Output high voltage | VOH | 2.6 |  |  | V | -40℃≤T≤125℃ | 5 |
| Output low voltage | VOL |  | 25 | 40 | mV | IL=1mA | 5 |
| Output low voltage | VOL |  |  | 50 | mV | -40℃≤T≤125℃ | 5 |
| Short-circuit current | ISC | -30 |  | 30 | mA |  | 5 |
| Power supply rejection ratio | PSRR | 80 | 95 |  | dB | 2.7V<VCM <5V | 6 |
| Power supply rejection ratio | PSRR | 70 | 90 |  | dB | -40℃≤T≤125℃ | 6 |
| Quiescent current per amplifier | ISY |  |  | 1.5 | mA | -40℃≤T≤125℃ | 6 |
| Settling time to 0.01% | ts |  |  | 0.5 | us | 0V to 1V step，AV=1 | 6 |
| 1/f noise peak-to-peak | en |  | 2.3 | 3.5 | uV | f=0.1Hz to 10Hz | 6 |

## CAD (KiCad official)

- Symbol: `MS8312`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ms8312-etched.step` / `ms8312-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ms8312.step` / `ms8312.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Hangzhou Ruimeng Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905155756900352) (18 pp, sha256 `23d2a5bcc3ad0345`, retrieved 2026-10-17, 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:** 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/ms8312-datasheet.pdf)