component
AT21CS01-STUM11-T
Public Made by Adomby adom
Microchip Tech EEPROM, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Contents
README
markdownAT21CS01-STUM11-T
Microchip Tech · EEPROM · SOT-23-3
AT21CS01-STUM11-T from Microchip Tech, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SI/O | bidirectional | Open-drain bidirectional serial input/output pin that must be pulled high with an external pull-up resistor and also supplies device power when pulled high to 1.7V to 3.6V for AT21CS01. |
| 2 | NC | unconnected | No Connect pin on the 3-Lead SOT23 package. |
| 3 | GND | power_in | Ground reference for the power supply, which should be connected to the system ground. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOT-23-3 |
| Category | Memory |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Pull-up Voltage | VPUP | 1.7 | 3.6 | V | High-Speed mode | 8 | |
| Pull-up Voltage | VPUP | 2.7 | 3.6 | V | Standard Speed mode | 8 | |
| Pull-up Resistance | RPUP | 130 | 200 | Ω | VPUP = 1.7V | 8 | |
| Pull-up Resistance | RPUP | 0.2 | 1.8 | kΩ | VPUP = 2.7V | 8 | |
| Pull-up Resistance | RPUP | 0.33 | 4 | kΩ | VPUP = 3.6V | 8 | |
| Active Current, Read | IA1 | 0.08 | 0.3 | mA | VPUP = 3.6V; SI/O = VPUP | 8 | |
| Active Current, Write | IA2 | 0.2 | 0.5 | mA | VPUP = 3.6V | 8 | |
| Standby Current | ISB | 0.6 | 1.5 | µA | VPUP = 1.8V; SI/O = VPUP; Industrial | 8 | |
| Standby Current | ISB | 0.6 | 3 | µA | VPUP = 1.8V; SI/O = VPUP; Extended | 8 | |
| Standby Current | ISB | 0.7 | 2.5 | µA | VPUP = 3.6V; Industrial | 8 | |
| Standby Current | ISB | 0.7 | 4 | µA | VPUP = 3.6V; Extended | 8 | |
| Input Low Level | VIL | -0.6 | 0.5 | V | 8 | ||
| SI/O Hysteresis | VHYS | 0.128 | 1.17 | V | 8 | ||
| Output Low Level | VOL | 0 | 0.4 | V | IOL = 4 mA | 8 | |
| Bus Capacitance | CBUS | 1000 | pF | 8 | |||
| Temperature under bias | -55 | 125 | °C | 8 | |||
| Storage temperature | -65 | 150 | °C | 8 | |||
| Voltage on any pin with respect to ground | -0.6 | V | Printed upper limit VPUP + 0.5V (formula, not numeric) | 8 | |||
| DC output current | 15 | mA | 8 | ||||
| Operating Temperature (Case), Industrial Temperature Range | -40 | 85 | °C | AT21CS01 Industrial range | 8 | ||
| Operating Temperature (Case), Extended Temperature Range | -40 | 125 | °C | AT21CS01 Extended range | 8 | ||
| Reset Low Time, Device in Inactive State | tRESET | 480 | µs | Standard Speed mode | 9 | ||
| Reset Low Time, Device in Inactive State | tRESET | 96 | µs | High Speed mode | 9 | ||
| Discharge Low Time, Device in Active Write Cycle (tWR) | tDSCHG | 150 | µs | Standard Speed mode | 9 | ||
| Reset Recovery Time | tRRT | 8 | µs | High Speed mode | 10 | ||
| Discovery Response Request | tDRR | 1 | µs | High Speed mode; printed max 2 - tPUP (formula) | 10 | ||
| Discovery Response Acknowledge Time | tDACK | 8 | 24 | µs | High Speed mode | 10 | |
| Host Strobe Discovery Response Time | tMSDR | 2 | 6 | µs | High Speed mode | 10 | |
| SI/O High Time for Start/Stop Condition | tHTSS | 150 | µs | High Speed mode; reset and discovery table | 10 | ||
| Bit Frame Duration | tBIT | 40 | 100 | µs | Standard Speed mode; input and output bit frame | 10 | |
| Bit Frame Duration | tBIT | 25 | µs | High Speed mode; input and output bit frame; printed min tLOW0 + tPUP + tRCV (formula) | 10 | ||
| SI/O High Time for Start/Stop Condition | tHTSS | 600 | µs | Standard Speed mode; input bit frame | 10 | ||
| SI/O Low Time, Logic '0' Condition | tLOW0 | 24 | 64 | µs | Standard Speed mode; input bit frame | 10 | |
| SI/O Low Time, Logic '0' Condition | tLOW0 | 6 | 16 | µs | High Speed mode; input bit frame | 10 | |
| SI/O Low Time, Logic '1' Condition | tLOW1 | 4 | 8 | µs | Standard Speed mode; input bit frame | 10 | |
| SI/O Low Time, Logic '1' Condition | tLOW1 | 1 | 2 | µs | High Speed mode; input bit frame | 10 | |
| Host SI/O Low Time During Read | tRD | 4 | µs | Standard Speed mode; output bit frame; printed max 8 - tPUP (formula) | 10 | ||
| Host SI/O Low Time During Read | tRD | 1 | µs | High Speed mode; output bit frame; printed max 2 - tPUP (formula) | 10 | ||
| Host Read Strobe Time | tMRS | 8 | µs | Standard Speed mode; output bit frame; printed min tRD + tPUP (formula) | 10 | ||
| Host Read Strobe Time | tMRS | 2 | µs | High Speed mode; output bit frame; printed min tRD + tPUP (formula) | 10 | ||
| Data Output Hold Time (Logic '0') | tHLD0 | 8 | 24 | µs | Standard Speed mode; output bit frame | 10 | |
| Data Output Hold Time (Logic '0') | tHLD0 | 2 | 6 | µs | High Speed mode; output bit frame | 10 | |
| Client Recovery Time | tRCV | 8 | µs | Standard Speed mode; input and output bit frame | 10 | ||
| Client Recovery Time | tRCV | 2 | µs | High Speed mode; input and output bit frame; printed max is note 5 (formula) | 10 | ||
| Noise Filtering Capability on SI/O | tNOISE | 0.5 | µs | Standard Speed mode; input bit frame | 10 | ||
| Write Cycle Time (tWR) | tWR | 5 | ms | VPUP (min.) < VPUP < VPUP (max.), TA = 25°C, Byte or Page Write mode | 11 | ||
| Write Endurance | 1e+06 | Write Cycles | VPUP (min.) < VPUP < VPUP (max.), TA = 25°C, Byte or Page Write mode | 11 | |||
| Data Retention | 100 | Years | TA = 55°C | 11 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] © 2022 Microchip Technology Inc. | 43 |
CAD (land: KiCad; 3D: generated from the datasheet)
- Symbol:
AT21CS01-STUM11-T - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3, generated on the KiCad land (body 1.3 x 2.9 mm, terminals on the pads, 1.0050000000000001 mm tall, datasheet A, midpoint of min and max). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files:
at21cs01-stum11-t-etched.step/at21cs01-stum11-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);at21cs01-stum11-t.step/at21cs01-stum11-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (55 pp, sha256
0750346a5e6f119a, retrieved 2026-11-13, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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: land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).