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Microchip Technology AT24CS01-MAHM-E
- Part No.:
- AT24CS01-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS01-MAHM-E.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
AT24CS01-MAHM-E 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 kHz/400 kHz/1 MHz I²C modes, 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-MAHM-E datasheet, AT24CS01-MAHM-E pinout, AT24CS01-MAHM-E application, or AT24CS01-MAHM-E equivalent, this page delivers verified electrical specs, package mapping to 8-pad UDFN, I²C timing compliance, write-protection behavior, and real-world use cases including firmware version tracking and hardware authentication.
Technical Context
The AT24CS01-MAHM-E 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) operation depending on VCC level - requiring external pull-up resistors ≤10 kΩ on SDA/SCL.
Memory is organized as 16 pages of 8 bytes each, enabling partial-page writes and sequential reads. The 128-bit serial number resides in a dedicated, read-only memory block accessed via I²C address prefix 0xB0, physically isolated from user EEPROM space and guaranteed unique across all CS-series devices.
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 (2.5–5.5V) - supports scalable bus timing based on system voltage |
| Serial number | 128-bit factory-programmed, permanent, read-only value - eliminates need for external serialization in production |
| Write protection | Hardware WP pin disables full-array writes when pulled high - provides deterministic, glitch-immune data lock |
| Power consumption | ≤3 mA active current, ≤6 μA standby current - suitable for battery-powered endpoints with infrequent writes |
| Temperature range | -40°C to +85°C - qualified for industrial and automotive under-hood peripheral applications |
Pinout & Package
AT24CS01-MAHM-E is packaged in an 8-pad UDFN (2 mm × 3 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 |
|---|---|---|
| A0 | Device address input | Hardwired to GND or VCC to set LSB of 7-bit I²C slave address (0x50–0x57); internally pulled down if floating |
| A1 | Device address input | Hardwired to GND or VCC to set middle bit of 7-bit I²C slave address; enables up to eight devices on one bus |
| A2 | Device address input | Hardwired to GND or VCC to set MSB of 7-bit I²C slave address; required for multi-device addressing |
| GND | Ground reference | System ground connection; must be low-impedance to ensure stable I²C signaling and ESD path |
| SDA | Serial data bidirectional I/O | Open-drain output/input requiring external pull-up; transmits/receives I²C data and ACK/NACK bits |
| SCL | Serial clock input | Input-only clock line; rising edge latches data, falling edge outputs data; must be pulled high externally |
| WP | Write-protect control | Active-high hardware lock: tied to VCC blocks all writes; tied to GND enables normal operation |
| VCC | Power supply | 1.7–5.5V supply input; includes internal power-on reset (POR) circuit with 100 µs tPUP delay after stabilization |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored outside user memory - enables zero-touch device onboarding and anti-cloning |
| 8-byte page write mode | Allows partial writes within a page boundary (e.g., 1–8 bytes per transaction), reducing bus overhead vs. byte-by-byte writes |
| Self-timed write cycle | Max 5 ms internal erase/write completion - no external polling needed beyond standard I²C acknowledge polling |
| Noise-suppressed I²C interface | Schmitt triggers + input filtering on SDA/SCL - tolerates >100 ns spikes and improves robustness in electrically noisy environments |
| Green packaging | RoHS-compliant, halide-free, lead-free UDFN - meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) |
Applications
| Smart Sensor Node | Industrial PLC Module |
|---|---|
|
Use Scenario: Storing calibrated sensor coefficients and unique device ID in a wireless temperature/humidity node powered by coin cell. IC Role / Device Role / Timing Role: Nonvolatile configuration storage and cryptographic identity anchor for TLS certificate binding. Use Value: Eliminates factory programming step using the permanent 128-bit serial number; 6 μA standby current extends battery life beyond 5 years. |
Use Scenario: Retaining firmware revision history and calibration offsets across power cycles in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: I²C-configurable parameter store with hardware write protection against accidental overwrites during field updates. Use Value: WP pin hardwired to VCC ensures critical calibration data remains intact during firmware uploads or brownout events. |
| Medical Wearable | Automotive Body Control Unit |
|
Use Scenario: Recording usage logs and patient-specific settings in a Class II wearable ECG monitor operating at 1.8V. IC Role / Device Role / Timing Role: Low-voltage EEPROM for audit trail storage with guaranteed 100-year data retention at 55°C. Use Value: 1.7V minimum VCC allows direct connection to 1.8V LDO output; 1,000,000 write cycles support daily log entries for >27 years. |
Use Scenario: Storing seat position presets and mirror calibration in a vehicle door module exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Industrial-grade serial EEPROM with -40°C to +85°C operation and ESD >4 kV for harsh automotive environments. Use Value: UDFN package withstands mechanical vibration; 128-bit serial number enables VIN-linked feature activation and service history tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C01D-MAHM-T | Same 1-Kbit capacity and UDFN-8 package, but lacks factory-programmed 128-bit serial number and FM+ (1 MHz) support | Cannot replace AT24CS01-MAHM-E where device identity or high-speed I²C is required | Select only if serial number and 1 MHz timing are unnecessary and cost is primary constraint |
| M24C01-RMN6TP | 1-Kbit I²C EEPROM in same UDFN-8 footprint, but rated only to 10⁶ write cycles and lacks integrated serial number | Not suitable for secure identity or long-term logging applications requiring guaranteed uniqueness | Use where basic parameter storage suffices and STMicroelectronics supply chain preference applies |
Compared with AT24CS01-MAHM-E, AT24C01D-MAHM-T omits the core differentiator - the immutable 128-bit serial number - while M24C01-RMN6TP offers functional parity for simple storage but no identity capability or FM+ timing, making both alternatives insufficient for authentication-critical designs.
Availability
AT24CS01-MAHM-E is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, automotive body control units, and secure IoT gateways requiring stable component supply, long-lifecycle assurance, and traceable RoHS-compliant sourcing.
Supply support for AT24CS01-MAHM-E 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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24CS01-MAHM-E belongs to Microchip's CS-series serial EEPROM product line, engineered specifically for secure device identity, tamper-resistant configuration storage, and low-power embedded systems requiring guaranteed uniqueness and industrial reliability.
FAQ
What is the function of the WP pin on the AT24CS01-MAHM-E?
The WP (Write-Protect) pin on the AT24CS01-MAHM-E is an active-high hardware control that, when tied to VCC, disables all write operations to the entire EEPROM array. When grounded, it enables normal read/write functionality. Internally pulled down if left floating, but Microchip recommends hardwiring it to a known state to prevent spurious writes due to capacitive coupling. This behavior is fully documented in the DS20006330A datasheet Section 2.5 and Table 2-2.
Does the AT24CS01-MAHM-E support 1 MHz I²C communication?
Yes, the AT24CS01-MAHM-E supports Fast Mode Plus (FM+) I²C operation at up to 1 MHz - but only when VCC is between 2.5V and 5.5V. At lower voltages (1.7V–2.5V), maximum speed is limited to 400 kHz. This dual-speed capability is explicitly specified in the "I2C-Compatible (Two-Wire) Serial Interface" feature list and Table 4-3 of the DS20006330A datasheet.
How is the 128-bit serial number accessed on the AT24CS01-MAHM-E?
The 128-bit serial number on the AT24CS01-MAHM-E is accessed via a dedicated I²C address block starting at 0xB0 (device type identifier '1011'), separate from the main 0x50–0x57 user memory address space. It is read-only, factory-programmed, and does not consume any of the 1-Kbit user EEPROM. Full access protocol and memory map are defined in Section 6 and Figure 6-1 of the DS20006330A datasheet.
What package type does AT24CS01-MAHM-E use, and is the exposed pad required?
The AT24CS01-MAHM-E uses an 8-pad UDFN package (2 mm × 3 mm, 0.5 mm pitch) with wettable flank leads. The exposed pad is optional: it may be connected to GND for improved thermal performance and ESD dissipation, or left floating with no impact on functionality. Package mechanical details appear in Figure 1-1 and Section 10 of DS20006330A.
What is the maximum write endurance and data retention for AT24CS01-MAHM-E?
The AT24CS01-MAHM-E guarantees 1,000,000 write cycles and 100 years of data retention at 55°C - both validated per JEDEC qualification standards and published in Table 4-6 of DS20006330A. These values apply to the entire EEPROM array, including page-write operations, and are measured under specified test conditions (TA = 25°C, VCC = 3.3V for endurance).
AT24CS01-MAHM-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- 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-UDFN (2x3)
AT24CS01-MAHM-E FAQ
1.How can I place an order for AT24CS01-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS01-MAHM-E 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-MAHM-E reliable?
The price and inventory of AT24CS01-MAHM-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS01-MAHM-E is usually 5 days.
3.What payment methods are accepted for AT24CS01-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS01-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS01-MAHM-E?
AT24CS01-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS01-MAHM-E 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-MAHM-E?
For technical support, including AT24CS01-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS01-MAHM-E requirements.
6.How does Aetrix verify that AT24CS01-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT24CS01-MAHM-E 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-MAHM-E meets industry standards.
7.What is the process for return or replacement of AT24CS01-MAHM-E?
All AT24CS01-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS01-MAHM-E, 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-MAHM-E part is unused and in its original packaging.
Return procedure for AT24CS01-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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