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Microchip Technology AT24CS04-XHM-T
- Part No.:
- AT24CS04-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS04-XHM-T.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,920
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Product details
Overview
AT24CS04-XHM-T from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 512 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports 100 kHz/400 kHz/1 MHz I²C modes, includes hardware write-protection via WP pin, and delivers ultra-low standby current (6 μA max) for battery-powered asset tracking and secure device identification.
For engineers reviewing the AT24CS04-XHM-T datasheet, AT24CS04-XHM-T pinout, AT24CS04-XHM-T application, or AT24CS04-XHM-T equivalent, this page provides verified pin functions, real-world use cases in secure boot and calibration storage, confirmed timing parameters (tWR ≤ 5 ms), and validated alternatives with documented interface and memory compatibility.
Technical Context
The AT24CS04-XHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A1/A2/WP pins. It uses an internal high-voltage generation circuit for EEPROM programming and integrates a dedicated 128-bit read-only serial number block physically isolated from user memory.
Memory is organized into 32 pages of 16 bytes each, supporting byte-write and 16-byte page-write operations with self-timed erase/write cycles. The device enters Standby mode after Stop condition or power-up reset, drawing ≤6 μA at 5.5V, and features Power-on Reset (VPOR ≤ 1.5V) with tPUP ≥ 100 µs delay before command acceptance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8), nonvolatile EEPROM with 100-year data retention |
| 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 (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus) - supports legacy and high-speed host systems |
| Write Cycle Time | ≤5 ms maximum - guarantees deterministic firmware update latency in embedded control loops |
| Endurance | 1,000,000 write cycles - sufficient for daily calibration updates over 27+ years |
| Serial Number | 128-bit factory-programmed, permanent, globally unique - eliminates need for external serialization in production |
| Operating Temp | -40°C to +85°C - qualified for industrial automation, automotive body electronics, and outdoor IoT nodes |
Pinout & Package
AT24CS04-XHM-T is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch) with exposed pad connected to GND per Microchip recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Device Address Input | Hard-wired to GND or VCC to set LSB of 7-bit I²C address; enables up to four AT24CS04 devices on one bus |
| A2 | Device Address Input | Hard-wired to GND or VCC to set second LSB of I²C address; determines device selectability in multi-drop configurations |
| GND | Ground Reference | System ground connection; exposed pad must be soldered to PCB ground plane for thermal and EMI performance |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external 1.3–10 kΩ pull-up; supports wire-OR with other I²C slaves |
| SCL | Serial Clock Input | Input-only clock line; rising edge latches input data, falling edge outputs data; filtered for noise immunity |
| WP | Hardware Write-Protect | Logic-high (VCC) disables all writes to entire memory array; internally pulled down if floating |
| VCC | Power Supply | 1.7–5.5V supply; must ramp monotonically at ≤0.1 V/µs; POR activates below 1.5V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit value permanently fused during wafer test; occupies no user memory space and is globally unique across all CS-series EEPROMs |
| Multi-Voltage I²C Interface | Supports 100/400 kHz at 1.7–5.5V and 1 MHz at 2.5–5.5V - eliminates voltage translation in mixed-supply systems |
| Hardware Write Protection | WP pin disables all write operations when tied to VCC - prevents accidental firmware corruption during field updates |
| Low-Power Operation | 6 μA max standby current at 5.5V enables >10-year battery life in coin-cell-powered sensors and trackers |
| Noise-Resilient Inputs | Schmitt triggers + spike suppression filters on SDA/SCL - ensures reliable communication in electrically noisy industrial environments |
Applications
| Secure Device Authentication | Calibration Data Storage |
|---|---|
Use Scenario: Embedded system verifies authenticity of peripheral module (e.g., sensor head, actuator) during power-up using cryptographic challenge-response with the 128-bit serial number. IC Role / Device Role / Timing Role: Nonvolatile identity source providing immutable, tamper-resistant hardware fingerprint for secure boot and anti-cloning. Use Value: Eliminates need for external secure element or software-based key management; reduces BOM cost and firmware complexity. | Use Scenario: Industrial temperature sensor stores factory-trimmed offset/gain coefficients and user-adjusted calibration values across power cycles. IC Role / Device Role / Timing Role: Persistent configuration storage with guaranteed 100-year retention and 1M write endurance for field recalibration. Use Value: Enables precision measurement without drift compensation algorithms; supports lifetime calibration traceability in medical and test equipment. |
| Firmware Configuration Lock | Asset Tracking ID Registry |
Use Scenario: Smart lighting controller locks critical operational parameters (e.g., dimming curve, thermal derating thresholds) after initial commissioning. IC Role / Device Role / Timing Role: Hardware-enforced configuration vault using WP pin and I²C address isolation to prevent unauthorized runtime modification. Use Value: Ensures regulatory compliance and safety-critical behavior consistency across product lifecycle and field deployments. | Use Scenario: Logistics tag embeds AT24CS04-XHM-T to store unique shipment ID, origin timestamp, and tamper-event log in cold-chain monitoring. IC Role / Device Role / Timing Role: Low-power, high-reliability identifier with serialized traceability for ISO/IEC 17025-compliant asset management. Use Value: Provides auditable chain-of-custody data without requiring active power during transit; survives extended storage at -40°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CS04-SSHM-T | Same 4-Kbit memory, identical serial number feature, but in 8-lead SOIC package (5.0 mm × 6.2 mm) | SOIC offers easier manual soldering and higher thermal mass; less space-constrained than TSSOP | Select when board layout prioritizes assembly yield over footprint size or when reflow profile requires slower thermal ramp rates |
| M95040-DRMN3TP/K | 4-Kbit SPI EEPROM (not I²C); no factory serial number; 2.5–5.5V supply; 5-ms write cycle | Requires SPI interface and separate chip-select routing; lacks hardware-level device identity for authentication | Select only if host MCU lacks I²C or requires simultaneous multi-device access via independent chip-select lines |
Compared with AT24CS04-SSHM-T, the AT24CS04-XHM-T saves 42% board area in TSSOP while maintaining full electrical and functional equivalence; versus M95040-DRMN3TP/K, it provides mandatory I²C compatibility and built-in serialization - eliminating external identity management logic and reducing firmware validation scope.
Availability
AT24CS04-XHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, secure peripheral authentication, and battery-powered calibration storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT24CS04-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24CS04-XHM-T belongs to Microchip's CS-series serial EEPROM family, engineered specifically for secure, low-power, and space-constrained applications where factory-programmed uniqueness and robust I²C interoperability are required.
FAQ
What is the I²C address configuration for AT24CS04-XHM-T?
The AT24CS04-XHM-T uses a 7-bit I²C address where bits [6:4] are fixed as 101, bit 3 is A2, bit 2 is A1, and bit 1 is R/W. With A2=A1=GND, the default address is 0x50. A1 and A2 are hard-wired inputs - not software-configurable - enabling up to four AT24CS04-XHM-T devices on one bus. The address is verified in Section 6.1.1 of DS20006350A.
Does AT24CS04-XHM-T support 1 MHz I²C operation across its full voltage range?
No. AT24CS04-XHM-T supports 1 MHz Fast Mode Plus only at VCC = 2.5V to 5.5V, as specified in Table 4-3 of DS20006350A. At 1.7V–2.5V, maximum speed is 400 kHz. This voltage-dependent timing ensures signal integrity and noise margin compliance - critical for reliable operation in noisy industrial environments.
How is the 128-bit serial number accessed on AT24CS04-XHM-T?
The 128-bit serial number is stored in a dedicated, read-only memory block starting at address 0x00FA (250 decimal). It is accessed via standard I²C sequential read starting from that address and requires no special command sequence. The value is factory-programmed and permanently locked - it cannot be overwritten, erased, or altered by any means, including during AT24CS04-XHM-T power cycling or write operations.
What is the maximum write endurance of AT24CS04-XHM-T under industrial conditions?
AT24CS04-XHM-T guarantees 1,000,000 write cycles at TA = 25°C and VCC = 3.3V in page-write mode, as stated in Table 4-6 of DS20006350A. Under continuous industrial operation at 85°C, endurance remains >500,000 cycles per Microchip's qualification data - sufficient for daily calibration updates over 13+ years without failure.
Can AT24CS04-XHM-T operate reliably with floating A1, A2, or WP pins?
While AT24CS04-XHM-T includes internal pull-downs on A1, A2, and WP, Microchip explicitly recommends against leaving them floating due to risk of capacitive coupling-induced misreads in noisy environments (Section 2, DS20006350A). For guaranteed reliability, A1/A2 should be hard-wired to GND/VCC and WP tied to GND (enable write) or VCC (disable write) - not left unconnected.
AT24CS04-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:
- 4Kbit
- Memory Organization:
- 512 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
AT24CS04-XHM-T FAQ
1.How can I place an order for AT24CS04-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS04-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 AT24CS04-XHM-T reliable?
The price and inventory of AT24CS04-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 AT24CS04-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS04-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS04-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS04-XHM-T?
AT24CS04-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS04-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 AT24CS04-XHM-T?
For technical support, including AT24CS04-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS04-XHM-T requirements.
6.How does Aetrix verify that AT24CS04-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS04-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 AT24CS04-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS04-XHM-T?
All AT24CS04-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS04-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 AT24CS04-XHM-T part is unused and in its original packaging.
Return procedure for AT24CS04-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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