# REF01CSA+

**Maxim Integrated** · Voltage References · SOIC-8

REF01CSA+ from Maxim Integrated, in a SOIC-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 | N.C. | unconnected | No internal connection on the REF01 SO package, so this pin is left unconnected. |
| 2 | VIN | power_in | Positive supply input; the datasheet gives a REF01 input range of 13V to 33V (REF01C: 13V to 30V for line regulation) with an absolute maximum of 40V for REF01E/H and 30V for REF01C. |
| 3 | N.C. | unconnected | Not connected on REF01 (this pin is the TEMP output only on REF02). |
| 4 | GND | power_in | Ground reference pin for the reference output and supply. |
| 5 | TRIM | input | Output-adjust terminal that trims VO by ±6% (±600mV on REF01) with a 10kΩ RP to the output, with only about 0.7ppm/°C tempco change per 100mV of adjustment. |
| 6 | VOUT | power_out | Precision reference output at 10.00V nominal for REF01 (5.000V for REF02), short-circuit protected indefinitely to ground or VIN. |
| 7 | N.C. | unconnected | No internal connection on the REF01 SO package. |
| 8 | N.C. | unconnected | No internal connection on the REF01 SO package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Package | SOIC-8 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VO | 9.9 | 10 | 10.1 | V | IL = 0mA, VIN = +15V, TA = +25°C | 3 |
| Output Adjustment Range | ΔVtrim | -2.7 |  | 6 | % | RP = 10kΩ | 3 |
| Output Voltage Noise | enP-P |  | 25 | 35 | µVP-P | 0.1Hz to 10Hz (Note 1) | 3 |
| Line Regulation |  |  | 0.009 | 0.015 | %/V | VIN = 13V to 30V (Note 2) | 3 |
| Load Regulation |  |  | 0.006 | 0.015 | %/mA | IL = 0 to 8mA (Note 2) | 3 |
| Turn-On Settling Time | tON |  | 400 |  | µs | To ±0.1% of final value | 3 |
| Quiescent Supply Current | ISY |  | 1 | 1.6 | mA | No load | 3 |
| Load Current | IL | 8 |  | 21 | mA | To specified output voltage tolerance | 3 |
| Sink Current | IS | 0.2 |  | 0.5 | mA | To specified output voltage tolerance | 3 |
| Short-Circuit Current | ISC |  | 30 |  | mA | VO = 0V | 3 |
| Output Voltage Change with Temperature | ΔVOT |  | 0.14 | 0.45 | % | VIN = +15V, TA = TMIN to TMAX, IL = 0mA (Note 3) | 3 |
| Output Voltage Temperature Coefficient | TCVO |  | 20 | 65 | ppm/°C | VIN = +15V, TA = TMIN to TMAX, IL = 0mA (Note 4) | 3 |
| Change in VO Temperature Coefficient with Output Adjustment |  |  | 0.7 |  | ppm/% | RP = 10kΩ | 3 |
| Line Regulation (TMIN to TMAX) |  |  | 0.011 | 0.018 | %/V | VIN = 13V to 30V (Note 2), TA = TMIN to TMAX | 3 |
| Load Regulation (TMIN to TMAX) |  |  | 0.008 | 0.018 | %/mA | IL = 0 to 5mA (Note 2), TA = TMIN to TMAX | 3 |
| Initial Error (ordering table, REF01CSA+) |  | -100 |  | 100 | mV | Printed as ±100 mV for part REF01CSA (SO-8, 0°C to +70°C, max tempco 65 ppm/°C) | 1 |
| Input Voltage (REF01C) | VIN |  |  | 30 | V | REF01C | 2 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 2 |
| Operating Temperature Range (REF01C, except REF01CESA) |  | 0 |  | 70 | °C | REF01E, REF01H, REF01C (except REF01CESA) | 2 |
| Lead Temperature (soldering, 60s) |  |  |  | 300 | °C | soldering, 60s | 2 |
| Continuous Power Dissipation, Small Outline (S) |  |  |  | 300 | mW | Small Outline (S), derate at 5.0mW/°C above +55°C | 2 |

## CAD (KiCad official)

- Symbol: `REF01CSA+`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ref01csa-etched.step` / `ref01csa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref01csa.step` / `ref01csa.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Maxim Integrated datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/ref01-ref02.pdf) (9 pp, sha256 `59101e8ba69ee8d5`, retrieved 2026-10-30, tier: manufacturer)
- **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](docs/ref01csa-datasheet.pdf)