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Microchip Technology AT24CS01-XHM-T
- Part No.:
- AT24CS01-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS01-XHM-T.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,936
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Product details
Overview
AT24CS01-XHM-T from Microchip Technology is a 1-Kbit (128 × 8) I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, operating from 1.7V to 5.5V, supporting 100/400 kHz and 1 MHz Fast Mode Plus, and rated for -40°C to +85°C industrial temperature range - used for secure device identification and configuration storage in embedded sensors and IoT edge nodes.
For engineers reviewing the AT24CS01-XHM-T datasheet, AT24CS01-XHM-T pinout, AT24CS01-XHM-T application, or AT24CS01-XHM-T equivalent, key selection criteria include guaranteed uniqueness of the 128-bit serial number across all CS-series devices, hardware write-protection via WP pin, ultra-low standby current (≤6 μA), and compatibility with mixed-voltage I²C buses down to 1.7V.
Technical Context
The AT24CS01-XHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0–A2 and WP pins. It supports standard (100 kHz), fast (400 kHz), and fast-mode plus (1 MHz) timing at VCC ≥2.5V, with self-timed write cycles completing in ≤5 ms.
Memory is organized as 16 pages of 8 bytes each, enabling partial page writes and random/sequential reads. The 128-bit serial number resides in a dedicated, read-only memory block addressed separately using device type identifier '1011b', consuming no user memory space and locked permanently during wafer fabrication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,024 bits (128 × 8), nonvolatile EEPROM with 1,000,000 write cycles endurance |
| Supply voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz FM+ (2.5–5.5V) - supports legacy and high-speed bus designs |
| Serial number | 128-bit factory-programmed, permanent, globally unique across all Microchip CS-series EEPROMs |
| Write protection | Dedicated WP pin - hardware-enforced full-array lock when pulled high to VCC |
| Power consumption | ≤3 mA active current (write), ≤6 μA standby current (VCC = 5.5V) - suitable for battery-powered endpoints |
| Temperature range | -40°C to +85°C - qualified for industrial and automotive under-hood-adjacent applications |
Pinout & Package
AT24CS01-XHM-T is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 1.27 mm pitch. Pin functions are validated per Microchip DS20006330A-page 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address input | Configures LSB of 7-bit I²C slave address; internally pulled down if floating - enables up to 8 devices on one bus |
| A1 | Hardware address input | Configures middle bit of slave address; same internal pull-down behavior as A0 |
| A2 | Hardware address input | Configures MSB of slave address; allows full 3-bit hardware addressing (0x50–0x57) |
| GND | Ground reference | System return path for VCC and signal logic; must be low-impedance connection |
| SDA | Serial data bidirectional I/O | Open-drain output/input requiring external pull-up; shares bus with other I²C devices |
| SCL | Serial clock input | Master-generated clock; rising edge latches input, falling edge outputs data |
| WP | Write-protect control | Active-high hardware lock - disables all writes when tied to VCC; internally pulled down if floating |
| VCC | Power supply | Single 1.7–5.5V supply; powers logic and EEPROM array; requires local decoupling capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique ID stored outside user memory - eliminates production-line serialization overhead |
| Hardware write protection (WP pin) | Prevents accidental or malicious overwrites of configuration data without physical pin reconfiguration |
| Ultra-low standby current (≤6 μA) | Enables multi-year operation on coin-cell batteries in always-on sensor nodes |
| Noise-immune I²C interface | Schmitt triggers + input filtering suppress EMI-induced glitches on SDA/SCL in noisy industrial environments |
| Page-write architecture (8-byte pages) | Reduces write time vs. byte-write; allows partial updates within a page without erasing adjacent bytes |
Applications
| Secure Device Authentication | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded gateway verifies authenticity of field-deployed modules before firmware update or data ingestion. IC Role / Device Role / Timing Role: AT24CS01-XHM-T provides cryptographically binding hardware identity via its immutable 128-bit serial number. Use Value: Prevents counterfeit module insertion by enabling root-of-trust binding at manufacturing - no software-based ID generation required. | Use Scenario: Factory-calibrated temperature/humidity sensor stores offset/gain coefficients persistently across power cycles. IC Role / Device Role / Timing Role: AT24CS01-XHM-T serves as nonvolatile configuration register holding calibration parameters accessed at boot. Use Value: Eliminates need for recalibration after power loss; retains accuracy over 100-year data retention specification. |
| IoT Edge Node Configuration | Medical Diagnostic Device Settings |
Use Scenario: Battery-powered environmental monitor loads network credentials, sampling intervals, and alert thresholds at startup. IC Role / Device Role / Timing Role: AT24CS01-XHM-T stores user-modifiable operational parameters in I²C-accessible EEPROM. Use Value: Enables field reconfiguration without firmware reflashing; low 3 mA write current minimizes battery drain during updates. | Use Scenario: Portable blood glucose meter retains patient-specific settings (units, alarm thresholds, history depth) between uses. IC Role / Device Role / Timing Role: AT24CS01-XHM-T acts as tamper-resistant parameter store with hardware WP pin enabled during clinical operation. Use Value: Ensures regulatory-compliant data persistence and prevents unintended setting changes via WP pin hardwiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C01D-XHM-T | No factory-programmed serial number; identical 1-Kbit organization, SOIC-8 package, and I²C interface | Lacks hardware-unique ID - unsuitable for authentication or anti-cloning use cases | Select when only basic nonvolatile storage is needed and serialization is handled externally |
| M95010-WMN6TP | 1-Kbit SPI interface (not I²C); same 1.7–5.5V range and -40°C to +85°C rating; no serial number | Requires SPI-capable host MCU; incompatible with existing I²C bus topology | Choose only if system already uses SPI peripherals and board layout cannot accommodate I²C routing |
Compared with AT24CS01-XHM-T, AT24C01D-XHM-T offers identical memory and packaging but omits the critical 128-bit serial number, while M95010-WMN6TP replaces I²C with SPI - making both alternatives functionally incomplete replacements unless the serial number or interface requirement is removed from the design.
Availability
AT24CS01-XHM-T is available at Aetrix Electronics and suitable for secure device authentication, industrial sensor calibration storage, and IoT edge node configuration requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT24CS01-XHM-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS01-XHM-T belongs to Microchip's CS-series Serial EEPROM product line, designed specifically to deliver factory-assigned, globally unique identifiers alongside reliable nonvolatile storage for secure and traceable embedded systems.
FAQ
What is the purpose of the 128-bit serial number in AT24CS01-XHM-T?
The 128-bit serial number in AT24CS01-XHM-T is factory-programmed and permanently locked during Microchip's production process. It is stored in a dedicated read-only memory block separate from the 1-Kbit user EEPROM array, ensuring global uniqueness across all CS-series devices. This enables secure device authentication, anti-counterfeiting, and simplified production traceability without consuming user memory space or requiring external serialization infrastructure.
Does AT24CS01-XHM-T support 1 MHz I²C communication?
Yes, AT24CS01-XHM-T supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only when VCC is between 2.5V and 5.5V. At lower supply voltages (1.7V–2.5V), it operates at up to 400 kHz (Fast mode) or 100 kHz (Standard mode). The AC timing specifications - including tLOW, tHIGH, and tBUF - are explicitly defined for FM+ in the official datasheet DS20006330A.
How does the Write-Protect (WP) pin function on AT24CS01-XHM-T?
The WP pin on AT24CS01-XHM-T is an active-high hardware lock: when pulled to VCC, it inhibits all write operations to the entire memory array, including page writes and serial number reads (though the serial number remains readable). When grounded or left floating (internally pulled down), normal read/write functionality is enabled. Microchip recommends hardwiring WP to a known state to avoid noise-induced misoperation.
What package type is used for AT24CS01-XHM-T?
AT24CS01-XHM-T uses an 8-lead SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm lead pitch and JEDEC MS-012AC footprint. This package is RoHS-compliant, halide-free, and compatible with automated PCB assembly processes. Pinout matches the industry-standard 2-wire EEPROM layout defined in Microchip's DS20006330A datasheet.
Can AT24CS01-XHM-T operate reliably at 1.7V supply?
Yes, AT24CS01-XHM-T is fully specified for operation at 1.7V, including I²C communication at 100 kHz and 400 kHz, read/write functionality, and 6 μA maximum standby current. All DC and AC electrical characteristics - such as VOL, VIH, and tWR - are guaranteed across the full 1.7V–5.5V range, making it suitable for ultra-low-voltage applications like energy-harvesting sensors and wearables.
AT24CS01-XHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT24CS01-XHM-T FAQ
1.How can I place an order for AT24CS01-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS01-XHM-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT24CS01-XHM-T reliable?
The price and inventory of AT24CS01-XHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS01-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS01-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS01-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS01-XHM-T?
AT24CS01-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS01-XHM-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT24CS01-XHM-T?
For technical support, including AT24CS01-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS01-XHM-T requirements.
6.How does Aetrix verify that AT24CS01-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS01-XHM-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT24CS01-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS01-XHM-T?
All AT24CS01-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS01-XHM-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT24CS01-XHM-T part is unused and in its original packaging.
Return procedure for AT24CS01-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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