AT21CS01-STUM-T - 1Kbit Single-Wire Serial EEPROM | Microchip
料号： AT21CS01-STUM-T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.43 | $43.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.3 | $300.00 |
| 3,000 | $0.26 | $780.00 |
AT21CS01-STUM-T 概述
A serial EEPROM is a non-volatile memory device accessed sequentially over a low-pin-count bus. The AT21CS01 belongs to the single-wire (1-Wire-style) EEPROM category, requiring only SI/O and GND - one signal pin for both data and parasitic power. In the broader hierarchy, it sits under EEPROM -> non-volatile memory -> memory IC -> semiconductor, and is optimized for unpowered attachments such as sensor calibration data storage, ink/toner cartridge identification, and after-market consumables.
Key features include an integrated 64-bit unique factory serial number, 8-byte page write or single-byte writes, a Discovery Response feature for quick device detection on the bus, and ultra-high write endurance of >1M cycles per location. The 1.7V to 3.6V supply range makes it directly compatible with 1.8V and 3.3V rails common in modern MCUs. The SOT-23-3 footprint occupies just 2.9 x 1.5 mm of PCB area, ideal for space-constrained cartridges and probe-style attachments.
The AT21CS01 uses a parasitic power scheme where the device harvests operating current from the SI/O line through an internal charge pump, eliminating the need for a dedicated VCC pin. Communication follows a master-driven, half-duplex protocol with a Reset/Presence sequence similar to other single-wire devices, simplifying host MCU firmware.
Typical applications include analog sensor calibration data storage, ink and toner cartridge identification, medical consumable tracking, cable/accessory authentication, and management of after-market consumables. The unique 64-bit serial number enables anti-counterfeit verification.
Designers must provide a pull-up resistor on the SI/O line (typically 2.1 kOhm to 10 kOhm depending on bus capacitance) and an open-drain driver from the host MCU. Standard-speed mode is recommended for long cables or high-capacitance busses.
This page synthesizes distributor pricing, parametric same-package alternatives, and practical design notes beyond what the manufacturer datasheet alone provides.
直接替换替代料： AT21CS01-STUM-T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AT21CS01-STUM-T （相同外形与封装尺寸） ——差异在于 Memory Size, Memory Type, Organization, Package.
快速对比工具——选择替代料号进行并排对比：
AT21CS01-STUM10-T
✅ 直接替换✓ 有现货
$0.26 / 个
查看数据手册 →AT21CS01-STUM11-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS01-STUM12-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS01-STUM13-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS01-STUM14-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS01-STUM15-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS11-STUM10-T
✅ 直接替换📋 参考替代料（不在目录中）
AT21CS01-STUM-T 规格参数
| 存储器类型 | Non-volatile EEPROM (Serial) |
| 存储容量 | 1 Kbit (128 x 8 bits) |
| 存储组织 | 128 words x 8 bits |
| Bus Interface | Single-Wire (SI/O) Serial |
| Operating Voltage Range | 1.7 V to 3.6 V |
| Standard-Speed Bit Rate | 15.4 kbps max (AT21CS01 only) |
| High-Speed Bit Rate | 125 kbps max |
| Write Cycle Support | 8-byte page write or single-byte write |
| Write Endurance | >1,000,000 cycles per location |
| Unique Serial Number | 64-bit factory-programmed |
| Discovery Response | Yes (quick device detection) |
| 工作温度范围 | -40 C to +85 C |
| 封装 | SOT-23-3 (TO-236-3, SC-59) |
| 安装类型 | Surface Mount |
| Power Scheme | Parasitic (powered via SI/O pin) |
| External Pins Required | 2 (SI/O and GND) |
| RoHS 状态 | Compliant |
AT21CS01-STUM-T 引脚配置
| 引脚 1 | SI/O — Single Input/Output data line, also supplies parasitic power via internal charge pump |
| 引脚 2 | GND — Ground reference |
| 引脚 3 | NC — No internal connection (per Microchip datasheet DS20005857D) |
典型应用
AT21CS01-STUM-T 适用于 7 应用s: Ink and Toner Cartridge Identification, Analog Sensor Calibration Data Storage, After-Market Consumable Authentication, Medical Consumable Tracking, Cable and Accessory Authentication, Battery Pack Identification and Cycle Logging, Industrial Sensor Tagging.
Ink and Toner Cartridge Identification
The AT21CS01-STUM-T fits ink and toner cartridge identification because its 2-pin SI/O + GND interface matches the simplest possible cartridge contact pattern, and the integrated 64-bit factory serial number provides immediate anti-counterfeit verification. With 128 bytes of storage plus >1M write endurance, the host printer can rewrite cartridge counters thousands of times without wearing out the EEPROM. The parasitic power scheme means the cartridge needs no battery or external power - it is energized only when seated in the printer. The SOT-23-3 footprint (2.9 x 1.5 mm) fits even the smallest inkjet cartridges. Per Microchip datasheet DS20005857D, this exact use case is one of the explicitly targeted applications.
推荐
Analog Sensor Calibration Data Storage
The AT21CS01-STUM-T is well suited to analog sensor calibration storage because the calibration coefficients, lot codes, and serial numbers can be written at factory calibration time and read back at each power-up over the SI/O pin. The >1M write endurance allows frequent recalibration during sensor life, while the 1.7-3.6V operating range directly matches low-voltage analog front-end rails. The unique factory-programmed 64-bit serial number supports traceability per unit. Per Microchip product documentation, analog sensor calibration storage is one of the explicit target use cases. Designers should reserve the first 8 bytes for the serial number and use the remaining 120 bytes for calibration tables and lot/date codes.
推荐
After-Market Consumable Authentication
The AT21CS01-STUM-T supports after-market consumable authentication because its 64-bit unique serial number and 1 Kbit user memory can store signed certificates or rolling counters. The 2-pin interface is mechanically simple, enabling low-cost probe contacts on consumable housings. The device's parasitic power scheme means no battery is needed in the consumable, and >1M write endurance supports frequent rewrites of authentication counters. The 1.7-3.6V range is compatible with battery-powered host devices like blood-glucose meters, e-cigarettes, and water filters. Per Microchip datasheet DS20005857D, after-market consumable management is an explicitly targeted application.
推荐
Medical Consumable Tracking
The AT21CS01-STUM-T is a strong fit for medical consumable tracking because the 2-pin SI/O + GND interface enables minimally invasive single-contact sterilization-compatible connections, while the 64-bit unique serial number ensures per-unit traceability required by FDA UDI regulations. The -40C to +85C operating range covers most medical device storage and use conditions. The 1.7-3.6V operating range matches the Li-ion battery rails common in portable medical devices. Per Microchip product documentation, this device is designed for unpowered attachments - a natural fit for disposable medical consumables like test strips, cartridges, and tubing sets.
推荐
Cable and Accessory Authentication
The AT21CS01-STUM-T suits cable and accessory authentication because the 2-pin SI/O + GND interface matches standard 2-wire cable identification conventions. The factory 64-bit serial number prevents counterfeite-grade cables from emulating genuine accessories, and the 128 bytes of user memory can store cable specifications, length calibration, and supported features. The 1.7-3.6V operating range directly matches USB and accessory-detection voltages used in smartphones, laptops, and docking stations. The device's small SOT-23-3 package fits inside connector backshells.
推荐
Battery Pack Identification and Cycle Logging
The AT21CS01-STUM-T fits battery pack identification because the 2-pin interface matches the simplest possible battery contact pattern and the >1M write endurance supports detailed cycle logging. Each charge/discharge cycle event can be written to EEPROM without wearing out the device for typical consumer battery lifetimes. The 64-bit unique serial number prevents counterfeite battery packs, which is a safety concern in high-energy Li-ion packs. The 1.7-3.6V operating range matches single-cell Li-ion/LiFePO4 rails. Per Microchip product documentation, the device is explicitly designed for unpowered attachments where it is energized only when in the host device.
推荐
Industrial Sensor Tagging
The AT21CS01-STUM-T is suitable for industrial sensor tagging because its SOT-243 footprint and -40C to +85C operating range fit harsh industrial environments. The 64-bit unique serial number supports per-sensor traceability for calibration audit trails required by ISO 9001 quality systems. The 1.7-3.6V operating range matches 3.3V industrial bus rails (Modbus, IO-Link). The 2-pin interface simplifies field wiring in retrofit installations. Per Microchip datasheet DS20005857D, sensor calibration storage is one of the explicit target applications.
推荐
推荐产品汇总
工程参考数据： AT21CS01-STUM-T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AT21CS01-STUM10-T | AT21CS01-STUM11-T | AT21CS01-STUM12-T | AT21CS01-STUM15-T | AT21CS11-STUM10-T |
|---|---|---|---|---|---|---|
| Package | SOT-23-3 | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Memory Size | 1 Kbit | 1 Kbit | 1 Kbit | 1 Kbit | 1 Kbit | 1 Kbit |
| Standard-Speed Mode (15.4 kbps) | Yes | Yes | Yes | Yes | Yes | No (High-Speed only) |
| High-Speed Mode (125 kbps) | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Voltage | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Factory Device Address | MPN-encoded (varies by suffix) | 000 | 001 | 010 | 100 | 000 (AT21CS11 die) |
关键差异点
- 2-pin parasitic-powered interface (SI/O + GND only) （对比 AT24C02 (standard I2C EEPROM, 4 pins required: VCC, GND, SDA, SCL))
- Factory-programmed 64-bit unique serial number included （对比 AT24C02 (no factory serial number))
- >1M write endurance per location (vs typical 100K-1M for I2C EEPROMs) （对比 24LC64-I/SN (1M write endurance typical))
- Discovery Response feature for fast device detection （对比 AT21CS11-STUM10-T (lacks Standard-Speed mode and Discovery Response timing))
设计说明
The AT21CS01-STUM-T only exposes SI/O (Pin 1), GND (Pin 2), and NC (Pin 3). Place the device near the edge of the PCB or contact pads since the SI/O pin doubles as the data and parasitic-power connection. Use a 2.1 kOhm to 10 kOhm pull-up resistor from SI/O to the host's 1.7V-3.6V rail, sized based on bus capacitance. Per Microchip datasheet DS20005857D, no VCC pin or decoupling capacitor is required.
The host MCU must drive the SI/O pin as an open-drain output with the internal pull-up disabled. A push-pull driver will damage the AT21CS01-STUM-T's internal charge pump. The reset/presence pulse requires the host to pull SI/O low for at least 480 us in Standard-Speed mode or 24 us in High-Speed mode per the Microchip datasheet - verify with an oscilloscope if communication fails at marginal bus lengths.
Do not assume the AT21CS01-STUM-T follows the Dallas/Maxim 1-Wire protocol - the command set and timing differ. Use the AT21CS01 firmware driver or community Arduino library, not a generic 1-Wire stack. Verify the factory device address in your MPN suffix to avoid bus collisions when multiple EEPROMs share one SI/O line - each address variant (STUM10-T through STUM16-T) addresses a different device on the bus.
Estimated: at 125 kbps High-Speed mode with a 2.1 kOhm pull-up, average SI/O line current draw is roughly 0.5 mA during reads (1.7V / 3.4 kOhm effective impedance). For battery hosts, switch to 10 kOhm pull-up when bus capacitance is below 50 pF to reduce quiescent draw. The AT21CS01-STUM-T does not enter a low-power sleep state; current draw scales with bus activity per Microchip datasheet DS20005857D.
合规信息
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this is a commercial/industrial grade EEPROM. Halogen-free per Microchip environmental compliance disclosures.
