AT21CS01-STUM10-T - 1Kb Single-Wire EEPROM, SOT-23-3 | Microchip
N.º de pieza: AT21CS01-STUM10-T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0.55 | $0,55 |
| 10 | $0.5 | $5,00 |
| 100 | $0.42 | $42,00 |
| 500 | $0.36 | $180,00 |
| 1.000 | $0.31 | $310,00 |
| 3.000 | $0.26 | $780,00 |
AT21CS01-STUM10-T Descripción general
A single-wire EEPROM is a non-volatile memory device that uses only one signal wire plus ground for both power harvesting and bidirectional data transfer. Within the broader semiconductor hierarchy, an EEPROM is a type of non-volatile memory (NVM), which sits alongside Flash, FRAM, and MRAM. Single-wire variants enable cost-constrained and physically small attachments - such as cartridges, probes, and disposable sensors - that cannot afford the four-wire SPI or two-wire I2C overhead.
Key specifications of the AT21CS01-STUM10-T include 1 Kbit of user-accessible EEPROM organized as 128 x 8 bits, a 5 ms maximum self-timed erase/write cycle, low-power operation suitable for I/O-powered (parasitic) harvesting from the host line, a factory-programmed 64-bit unique serial number for traceability, and an industrial temperature range of -40C to +85C. The device also features a security register for optional write-protection of the lower 64 bits.
Architecturally, the AT21CS01 uses an I2C-compatible protocol structure transported over a single wire, allowing it to leverage mature I2C framing (start, stop, acknowledge, device address) while physically requiring only one signal pin. This makes it ideal for unpowered attachments where only a two-point mechanical contact is feasible. The on-chip charge pump and EEPROM cell array are optimized for the very low quiescent current typical of passively powered applications.
Typical applications include analog sensor calibration data storage, ink and toner printer cartridge identification and authentication, after-market consumable management, medical disposable accessories, electronic labeling, and any cost-sensitive embedded system needing traceable, non-volatile identification memory. The wide operating voltage and single-wire interface make it well suited to battery-less and minimal-pin designs.
When designing with the AT21CS01-STUM10-T, remember that the device is powered parasitically from the SI/O line through an internal rectifier; the host must provide an adequate pull-up and supply the EEPROM through the data line, following the timing diagrams in the datasheet. For multi-device buses, each IC has a unique 64-bit serial number, but the STUM10-T variant ships with a fixed I2C address (000), so bus-sharing requires pin assignment discipline.
This page synthesizes distributor pricing, true drop-in same-package alternatives, and practical design notes not consolidated in the manufacturer datasheet alone.
Alternativas directas para AT21CS01-STUM10-T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con AT21CS01-STUM10-T (mismo factor de forma y huella) — difiere en Memory Type, Package, Write Endurance, Interface, Memory Size.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AT21CS01-STUM11-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AT21CS11-STUM10-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AT21CS11-STUM11-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AT21CS01-STUM10-T Especificaciones
| Tipo de memoria | EEPROM (Non-Volatile) |
| Tamaño de memoria | 1 Kbit (128 x 8) |
| Organización de memoria | 128 x 8 |
| Interfaz | Single-Wire (I2C-compatible protocol structure) |
| Serial Number | Factory-programmed 64-bit unique ID |
| Clock Frequency (Standard Mode) | 15.4 kbps |
| Clock Frequency (High Speed) | 125 kbps |
| Tensión de alimentación | 1.7 V to 3.6 V |
| Write Cycle Time (Word/Page) | 5 ms max (self-timed) |
| Write Endurance | >1,000,000 cycles per location |
| Temperatura de funcionamiento | -40 C to +85 C (Industrial) |
| Encapsulado | SOT-23-3 (TO-236-3 / SC-59) |
| Tipo de montaje | Surface Mount |
| Número de pines | 3 |
| Estado RoHS | Compliant |
| Pin Configuration | SI/O (data + parasitic power), GND, NC |
Configuración de pines de AT21CS01-STUM10-T
| Pin 1 | SI/O — Single-wire Serial Data Input/Output and parasitic power input (data line plus internal power harvesting) |
| Pin 2 | GND — Ground reference for the single-wire interface and internal logic |
| Pin 3 | NC — Not connected (per datasheet) - leave floating on PCB |
Aplicaciones típicas
AT21CS01-STUM10-T es adecuado para 6 aplicacións: Ink and Toner Cartridge Identification, Analog Sensor Calibration Data Storage, After-Market Consumable Authentication, Electronic Labeling and Asset Tags, Medical Disposable Accessories, Printer and Copier Service Consumables.
Ink and Toner Cartridge Identification
The AT21CS01-STUM10-T is the canonical cartridge-authentication memory for inkjet and toner cartridges that can only expose two mechanical contacts (one signal plus chassis ground). Its 1.7-3.6V parasitic supply is harvested from the printer's SI/O line, so no separate VCC pin is required on the cartridge side, while the 64-bit factory-programmed serial number uniquely identifies each cartridge for OEM authentication, refill detection, and warranty tracking. With >1M write cycles and a 5 ms write time, the chip supports counters that decrement with each page, enabling accurate consumable-life metering. It is pin-compatible with the higher-density AT21CS11 for premium cartridges needing 2 Kbit of calibration tables.
Recomendado
Analog Sensor Calibration Data Storage
Precision analog sensors (load cells, thermocouples, pH probes, gas sensors) require factory calibration constants that must travel with the probe. The AT21CS01-STUM10-T stores up to 128 bytes of calibration coefficients, gain/offset trim, and serial number in a footprint smaller than the sensor itself. Its single-wire interface lets the probe housing expose just two contacts, and its 1.7V minimum supply operates directly from many sensor ASIC rails. Write endurance >1M cycles allows in-field recalibration, while the unique 64-bit serial number provides full traceability for ISO 17025 calibration records and quality audits.
Recomendado
After-Market Consumable Authentication
Medical, automotive, and 3D-printing consumables increasingly embed authentication memories to fight counterfeiting and ensure patient/operator safety. The AT21CS01-STUM10-T fits inside disposable cartridges, tubing sets, surgical tools, and printer heads where PCB area is measured in mm squared. Its single-wire SI/O interface reduces the host connector from 4 pins (SPI) or 3 pins (I2C) down to 1 signal pin, dramatically lowering mating-cycle connector cost. The 64-bit unique serial number plus 1 Kbit user area allow cryptographic challenge-response or simple signed-counter schemes, and the >1M write endurance supports per-use logging on disposable items.
Recomendado
Electronic Labeling and Asset Tags
The AT21CS01-STUM10-T is widely used in passive RFID-style asset tags where a host reader powers and reads the tag through a single SI/O contact. It stores a 64-bit unique serial number plus up to 128 bytes of user data (asset ID, calibration date, location code) in a SOT-23-3 package small enough to fit on a cable-tie tag, syringe label, or printed circuit board fiducial. The 125 kbps High Speed mode allows fast bulk scanning of tagged items, while the 1.7V minimum supply is compatible with low-voltage readers and battery-assisted passive (BAP) hosts. The 1M write cycle endurance supports lifetime tag rewriting in re-usable container tracking.
Recomendado
Medical Disposable Accessories
Single-use medical devices - insulin pens, nebulizer cartridges, smart bandages, surgical drapes - need a low-cost, non-volatile memory to record dose, treatment time, or patient identifier. The AT21CS01-STUM10-T's SOT-23-3 footprint fits on the smallest disposable PCB or flex circuit, and its single-wire interface reduces connector pin count, lowering both BOM and assembly cost. With 1 Kbit of storage, it can log timestamps, dose counters, and basic patient data; the 64-bit unique serial number supports FDA UDI (Unique Device Identification) traceability. The >1M write endurance comfortably supports hundreds of doses per disposable, while the 5 ms write time keeps firmware latency negligible.
Recomendado
Printer and Copier Service Consumables
Photocopiers, label printers, and point-of-sale printers use the AT21CS01-STUM10-T to identify and authenticate fuser kits, transfer belts, waste toner bottles, and paper trays. The chip sits on each consumable's small PCB and is read by the host printer's single-wire master. Its 1.7V-3.6V operation matches the printer's internal 3.3V logic rail, and the 5 ms write cycle allows the host to log usage counters after each page without slowing print throughput. The factory-programmed 64-bit serial number prevents aftermarket consumables from being misread as OEM, while the user EEPROM area stores page count, temperature drift data, and consumable type.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AT21CS01-STUM10-T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AT21CS01-STUM11-T | AT21CS11-STUM10-T | AT21CS11-STUM11-T |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOT-23-3 | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same |
| Memory Size | 1 Kbit (128 x 8) | 1 Kbit (128 x 8) - same | 2 Kbit (256 x 8) - +100% | 2 Kbit (256 x 8) - +100% |
| Interface | Single-Wire (I2C-compatible) | Single-Wire (I2C-compatible) - same | Single-Wire (I2C-compatible) - same | Single-Wire (I2C-compatible) - same |
| Max Clock Frequency | 125 kbps | 125 kbps - same | 125 kbps - same | 125 kbps - same |
| Supply Voltage | 1.7 V to 3.6 V | 1.7 V to 3.6 V - same | 1.7 V to 3.6 V - same | 1.7 V to 3.6 V - same |
| Write Endurance | >1,000,000 cycles | >1,000,000 cycles - same | >1,000,000 cycles - same | >1,000,000 cycles - same |
| Fixed I2C Address | 000 | Different fixed address - varies by lot | 000 - same | Different fixed address - varies by lot |
Diferenciadores clave
- Lowest pin count non-volatile memory in the industry for unpowered attachments (frente a 24LC02 I2C EEPROM)
- Factory-programmed 64-bit unique serial number for traceability (frente a AT21CS11-STUM10-T)
- >1 million write cycles per memory location (frente a Standard I2C EEPROM (e.g., 24LC256))
Notas de diseño
The AT21CS01-STUM10-T is I/O-powered (parasitic): the internal VCC is harvested from the SI/O data line through an on-chip rectifier. The host must provide a pull-up resistor (typically 2.2 kohm to 10 kohm depending on bus capacitance) and source enough current during write cycles, when the EEPROM draws up to a few mA for the 5 ms erase/write window. According to the Microchip datasheet, an external bulk capacitor on SI/O may be required if the host cannot sustain the write current; without adequate supply the write will fail silently. Decouple the host SI/O rail with a 100 nF ceramic if the line is long or noisy.
Keep the SI/O trace short and direct to the host connector pin, and place the AT21CS01-STUM10-T within 25 mm of the SI/O contact pad to minimize parasitic capacitance that slows the 125 kbps High Speed mode rise/fall times. Route GND on the bottom layer directly under the IC for low-impedance return, and leave the NC pin (pin 3) floating - do not connect it to ground, as this may load the internal substrate diode. According to the Microchip datasheet, the SOIC-8 variant and SOT-23-3 variant have different thermal pads; for SOT-23-3 no thermal pad connection is needed.
Three common pitfalls when designing with the AT21CS01-STUM10-T: 1) Confusing the single-wire protocol with Dallas/Maxim 1-Wire - the AT21CS01 uses I2C-compatible framing (start, stop, ACK) on a single wire, NOT the 1-Wire reset/presence pulse sequence, so existing 1-Wire host libraries will not work. 2) Assuming the I2C address is programmable - it is factory-programmed and cannot be changed; STUM10-T and STUM11-T differ only in this fixed address. 3) Ignoring write timing - the host must wait 5 ms after each write before reading back, or apply ACK polling per the datasheet; otherwise stale data will be read.
Información de cumplimiento
RoHS and REACH compliance per Microchip product page. Lead-free (Pb-free) reflow-compatible per SOT-23-3 industrial grade. Halogen-free status not explicitly stated in retrieved data - marked unknown. Not AEC-Q100 qualified; this is a commercial/industrial grade part. Conflict-minerals declaration compliant per Microchip corporate policy.
