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Microchip Technology AT24CS04-STUM-T
- Part No.:
- AT24CS04-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CS04-STUM-T.pdf
- Description:
- IC EEPROM 4KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
AT24CS04-STUM-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-STUM-T datasheet, AT24CS04-STUM-T pinout, AT24CS04-STUM-T application, or AT24CS04-STUM-T equivalent, key selection criteria include guaranteed uniqueness of the 128-bit serial number across all CS-series EEPROMs, support for Fast Mode Plus at 2.5–5.5V, page-write capability with ≤5 ms self-timed cycle, and compatibility with space-constrained designs using the 8-pad UDFN package.
Technical Context
The AT24CS04-STUM-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. Its memory array is partitioned into 32 pages of 16 bytes each, enabling partial-page writes and sequential reads without address wraparound.
It integrates a Power-on Reset (POR) circuit with 1.5 V threshold and requires ≥100 µs delay after stable VCC before first command; write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or GND (normal operation), independent of software control.
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 |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus) - supports high-throughput configuration storage |
| Write endurance | 1,000,000 cycles - suitable for frequent calibration or logging applications |
| Standby current | ≤6 μA at 5.5V - extends battery life in always-on IoT edge nodes |
| Serial number | 128-bit factory-programmed, read-only, globally unique across all CS-series devices - eliminates need for external serialization |
| Operating temperature | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor sensor modules |
Pinout & Package
AT24CS04-STUM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect | Not bonded; electrically isolated - no routing or termination required |
| A1 | Device address input | Hard-wired to GND/VCC to set I²C slave address; enables up to four devices on same bus |
| A2 | Device address input | Second address bit; used with A1 to configure one of four possible 7-bit I²C addresses (1010xxx) |
| 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 requiring external pull-up; shares bus with other I²C slaves |
| SCL | Serial clock input | Master-generated clock; latches input data on rising edge, outputs data on falling edge |
| WP | Hardware write-protect | Active-high lock: tied to VCC disables all writes to entire memory array |
| VCC | Power supply | 1.7–5.5V supply; powers internal high-voltage generation for EEPROM writes |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored outside user memory - enables secure device binding without firmware overhead |
| 16-byte page write mode | Enables efficient partial updates (e.g., single parameter overwrite) without erasing full page - reduces write latency and wear |
| Schmitt-triggered, filtered I/O | Rejects noise spikes <100 ns (Fast Mode) or <50 ns (Fast Mode Plus) - improves robustness in electrically noisy industrial environments |
| Self-timed write cycle | Max 5 ms duration with automatic internal timing - eliminates need for external polling or timeout logic in host firmware |
| Green packaging | Lead-free, halide-free, RoHS-compliant UDFN - meets environmental compliance for global consumer and industrial shipments |
Applications
| Asset Tracking Tag | Industrial Sensor Node |
|---|---|
Use Scenario: Tamper-evident RFID/NFC-enabled equipment tag storing calibration history, firmware version, and ownership ID. IC Role / Device Role / Timing Role: Nonvolatile configuration and identity storage; serial number serves as cryptographic root-of-trust anchor. Use Value: Eliminates manual serialization step during manufacturing; 128-bit uniqueness prevents cloning across fleet deployments. | Use Scenario: Wireless temperature/humidity sensor mounted in HVAC ducts or factory floors with multi-year battery life. IC Role / Device Role / Timing Role: Persistent storage for sensor calibration coefficients, last-known readings, and fault logs. Use Value: 6 μA standby current extends coin-cell battery life beyond 10 years; 1.7V operation ensures functionality during brownout conditions. |
| Medical Diagnostic Module | Automotive Body Control Unit |
Use Scenario: Portable ECG monitor storing patient ID, device serial, and usage counters for regulatory traceability. IC Role / Device Role / Timing Role: Secure, immutable identity storage; write-protection prevents accidental overwriting of critical identifiers. Use Value: WP pin hardwired to VCC ensures zero risk of field corruption; 100-year data retention satisfies FDA long-term recordkeeping requirements. | Use Scenario: Door module storing window position limits, mirror angle presets, and anti-pinch calibration data. IC Role / Device Role / Timing Role: Configuration memory accessed during power-up and runtime; survives vehicle battery disconnects. Use Value: -40°C to +85°C rating ensures reliability across engine bay and cabin environments; 1 MHz I²C enables fast reconfiguration during wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C04D-SSHM-T | Same 4-Kbit capacity, but lacks factory-programmed 128-bit serial number; uses standard I²C addressing only | No built-in device identity - requires external serialization or MCU-based UID generation | Select when cost sensitivity outweighs need for guaranteed hardware uniqueness |
| M95040-DRMN6TP/K | 4-Kbit SPI interface (not I²C); 2.5–5.5V supply; no factory serial number; 5-ms write cycle | Requires SPI-capable host; incompatible bus protocol prevents drop-in replacement | Choose only if existing design uses SPI peripherals and board layout cannot accommodate I²C routing |
Compared with AT24CS04-STUM-T, AT24C04D-SSHM-T offers identical memory density and voltage range but omits the tamper-proof serial number - making it unsuitable for secure authentication. M95040-DRMN6TP/K mandates SPI hardware changes and lacks hardware-level identity, limiting its use to non-secure, SPI-native systems.
Availability
AT24CS04-STUM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic modules, automotive body electronics, and asset tracking tags requiring stable component supply, long-life data retention, and guaranteed hardware uniqueness.
Supply support for AT24CS04-STUM-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, with a focus on embedded control and secure connectivity.
The AT24CS04-STUM-T belongs to Microchip's CS-series Serial EEPROM product line, designed specifically for applications demanding guaranteed hardware uniqueness, low-power operation, and industrial-grade reliability in compact form factors.
FAQ
What is the function of the NC pin on the AT24CS04-STUM-T?
The NC (No Connect) pin on the AT24CS04-STUM-T is not internally bonded and serves no electrical function. It must remain unconnected in PCB layout - neither routed nor terminated. This pin is present due to package compatibility with other variants in the AT24CS04/AT24CS08 family but has no role in AT24CS04-STUM-T operation or configuration.
Does the AT24CS04-STUM-T support 1 MHz I²C communication across its full voltage range?
No, the AT24CS04-STUM-T supports 1 MHz Fast Mode Plus (FM+) only at VCC = 2.5V to 5.5V. Below 2.5V, maximum I²C speed is limited to 400 kHz (Fast Mode). This voltage-dependent timing is specified in the AC Characteristics table of the official datasheet DS20006350A, and must be observed to ensure reliable communication.
How is the 128-bit serial number accessed on the AT24CS04-STUM-T?
The 128-bit serial number on the AT24CS04-STUM-T is stored in a dedicated, read-only memory region outside the main 4-Kbit user array. It is accessed via a specific I²C command sequence defined in Section 8.4 of the datasheet: a repeated Start condition followed by the device address and offset 0x0008, then reading 16 consecutive bytes. The value is factory-programmed and cannot be altered.
Can the WP pin on the AT24CS04-STUM-T be left floating in a design?
While the WP pin on the AT24CS04-STUM-T has an internal pull-down, Microchip explicitly recommends against leaving it floating due to risk of capacitive coupling causing unintended write-enable states. For guaranteed protection, WP must be hardwired to either VCC (to disable all writes) or GND (to allow writes). If using a pull-up resistor, 10 kΩ or less is advised per datasheet guidance.
What is the maximum write endurance of the AT24CS04-STUM-T, and under what conditions is it specified?
The AT24CS04-STUM-T guarantees 1,000,000 write cycles per memory location, characterized at TA = 25°C and VCC = 3.3V using page-write mode. This endurance applies to the entire 512-word array and is validated through qualification testing - not just typical behavior. Endurance remains valid across the full industrial temperature range (-40°C to +85°C), though actual field lifetime depends on thermal and voltage stress profiles.
AT24CS04-STUM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- SOT-23-5
AT24CS04-STUM-T FAQ
1.How can I place an order for AT24CS04-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS04-STUM-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-STUM-T reliable?
The price and inventory of AT24CS04-STUM-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-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CS04-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS04-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS04-STUM-T?
AT24CS04-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS04-STUM-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-STUM-T?
For technical support, including AT24CS04-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS04-STUM-T requirements.
6.How does Aetrix verify that AT24CS04-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS04-STUM-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-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CS04-STUM-T?
All AT24CS04-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS04-STUM-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-STUM-T part is unused and in its original packaging.
Return procedure for AT24CS04-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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