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Microchip Technology AT24CS32-MAHM-T
- Part No.:
- AT24CS32-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS32-MAHM-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:25,633
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Product details
Overview
AT24CS32-MAHM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 4,096 × 8 bits, operating from 1.7V to 5.5V across -40°C to +85°C, and featuring hardware write protection (WP), 400 kHz Fast Mode and 1 MHz Fast Mode Plus support, used for secure device identification and nonvolatile configuration storage in embedded systems.
For engineers reviewing the AT24CS32-MAHM-T datasheet, AT24CS32-MAHM-T pinout, AT24CS32-MAHM-T application, or AT24CS32-MAHM-T equivalent, this page delivers verified electrical specs, package mapping to 8-lead SOIC, validated I²C timing compliance, and real-world use cases in asset tracking, firmware versioning, and secure boot credential storage.
Technical Context
The AT24CS32-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered SCL/SDA inputs and integrated noise filtering, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) clock rates depending on VCC level. Its memory array is partitioned into 128 pages of 32 bytes each, enabling partial-page writes and sequential reads without address wraparound.
It integrates a dedicated, read-only 128-bit serial number block addressed separately via I²C device type identifier '1011b', physically isolated from user EEPROM space and permanently locked during wafer fabrication. The WP pin provides hardware-level full-array write inhibition when driven high, while A0–A2 pins enable up to eight devices on a shared bus via hardwired addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8), sufficient for storing calibration data, device IDs, or boot parameters in compact embedded nodes |
| Interface | I²C-compatible two-wire bus with 100/400 kHz Standard/Fast Mode and 1 MHz Fast Mode Plus (2.5–5.5V), enabling flexible host controller integration |
| Supply Voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters |
| Write Endurance | 1,000,000 cycles - ensures reliable field updates over product lifetime in telemetry or logging applications |
| Data Retention | 100 years at 55°C - guarantees long-term integrity of stored cryptographic keys or manufacturing metadata |
| Standby Current | ≤6 µA at 5.5V - minimizes quiescent power in battery-backed or energy-harvesting systems |
| Serial Number | 128-bit factory-programmed, permanent, globally unique across all CS Series EEPROMs - enables zero-touch device authentication |
Pinout & Package
AT24CS32-MAHM-T is supplied in an 8-lead SOIC package (JEDEC MS-012AC), with lead finish matte tin and RoHS-compliant green construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Address Input | Configures LSB of 7-bit I²C slave address; pulled down internally if floating, enabling multi-device bus topology |
| A1 | Hardware Address Input | Configures middle bit of 7-bit I²C slave address; allows up to eight devices sharing one I²C bus |
| A2 | Hardware Address Input | Configures MSB of 7-bit I²C slave address; must be tied to known logic state for deterministic addressing |
| GND | Ground Reference | System ground connection for VCC return path and internal circuit biasing |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line requiring external pull-up resistor (≤10 kΩ); supports wire-OR bus architecture |
| SCL | Serial Clock Line | Input-only I²C clock line with Schmitt trigger; controls data latching (rising edge) and output timing (falling edge) |
| WP | Write-Protect Control | Active-high hardware lock: drives high to disable all writes to entire memory array, preventing accidental corruption |
| VCC | Power Supply | Primary supply input (1.7–5.5V); powers internal high-voltage generation for EEPROM writes and logic core |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit value permanently written during wafer test and inaccessible to user writes - eliminates post-manufacturing serialization overhead |
| Multi-Voltage I²C Timing Support | 1 MHz operation at ≥2.5V and 400 kHz down to 1.7V - enables interoperability with diverse microcontrollers without clock rate negotiation |
| Hardware Write Protection | WP pin disables all write commands when driven to VCC - provides fail-safe memory lockdown independent of software state |
| Noise-Resilient Interface | Schmitt-trigger inputs and spike suppression filters on SCL/SDA - maintain reliable communication in electrically noisy industrial environments |
| Page Write Architecture | 32-byte page buffer allows partial writes (e.g., 1–32 bytes per transaction) - reduces bus occupancy and improves update efficiency |
Applications
| Asset Tracking Tag | Firmware Versioning |
|---|---|
Use Scenario: Embedded in IoT sensor nodes deployed across logistics fleets to store unique identifiers, calibration offsets, and last-known GPS coordinates. IC Role / Device Role / Timing Role: Nonvolatile identity anchor and configuration store; accessed infrequently during boot or wake-up, with write operations triggered only on recalibration or firmware update. Use Value: Leverages 128-bit serial number for tamper-resistant device fingerprinting and 1M write cycles to sustain field updates over 10+ years of service life. | Use Scenario: Integrated into medical diagnostic equipment to record firmware revision, patch level, and regulatory certification date for audit compliance. IC Role / Device Role / Timing Role: Secure version registry; updated only during controlled field upgrades, with WP pin asserted during normal operation to prevent corruption. Use Value: Uses hardware write protection and 100-year data retention to guarantee immutable version history traceable across device lifecycle and regulatory submissions. |
| Secure Boot Credential Storage | Industrial HMI Configuration |
Use Scenario: Mounted on PLC controller boards to hold public key hashes and root-of-trust certificates used during secure boot validation. IC Role / Device Role / Timing Role: Read-only cryptographic reference store; accessed once per power cycle during boot sequence, never written in field operation. Use Value: Isolates 128-bit serial number and user EEPROM into separate address spaces - prevents certificate overwrite and enables cryptographic binding to hardware identity. | Use Scenario: Used in factory-floor HMIs to retain operator preferences, language settings, and display brightness levels across power cycles. IC Role / Device Role / Timing Role: Low-power configuration keeper; reads settings at startup and writes changes only on explicit user save action. Use Value: Achieves ≤6 µA standby current and 1.7V operation - extends backup battery life in mains-powered HMIs with supercapacitor hold-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-MAHM-T | Lacks factory-programmed 128-bit serial number; identical 32-Kbit capacity, SOIC-8 package, and I²C timing | Not suitable for device authentication or zero-touch provisioning; limited to generic configuration storage | Select only if serial number functionality is unnecessary and cost sensitivity outweighs security requirements |
| M24C32-WMN6TP | STMicroelectronics part with same 32-Kbit density and SO8 package but no unique serial number; rated for -40°C to +105°C | Higher temperature rating suits under-hood automotive use, but lacks hardware-level identity binding | Prefer for extended-temp industrial control where serialization is handled externally via MCU logic |
Compared with AT24CS32-MAHM-T, AT24C32D-MAHM-T omits the critical 128-bit serial number feature required for hardware-rooted identity, while M24C32-WMN6TP trades that capability for broader temperature tolerance-making AT24CS32-MAHM-T the sole choice when device-level uniqueness and cryptographic binding are mandatory.
Availability
AT24CS32-MAHM-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and secure IoT edge node applications requiring stable component supply, long-lifecycle support, and guaranteed traceability of serialized devices.
Supply support for AT24CS32-MAHM-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 components, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The AT24CS32 belongs to Microchip's CS Series of serial EEPROMs, designed specifically to eliminate production-line serialization by embedding guaranteed-unique identifiers directly into silicon - targeting secure device onboarding, anti-counterfeiting, and regulatory traceability.
FAQ
What is the function of the WP pin on the AT24CS32-MAHM-T?
The WP (Write-Protect) pin on the AT24CS32-MAHM-T is an active-high hardware control that, when driven to VCC, disables all write operations to the entire 32-Kbit memory array. When grounded, normal read and write functions operate. Internally pulled down if left floating, it ensures default writability unless explicitly secured - a critical safeguard against firmware corruption in deployed AT24CS32-MAHM-T units.
Does the AT24CS32-MAHM-T support 1 MHz I²C communication?
Yes, the AT24CS32-MAHM-T supports 1 MHz Fast Mode Plus I²C operation, but only when VCC is between 2.5V and 5.5V. At lower supply voltages (1.7V–2.5V), maximum clock frequency is limited to 400 kHz. This voltage-dependent timing behavior is explicitly defined in the AC Characteristics table of the official DS20006341A datasheet for AT24CS32-MAHM-T.
How is the 128-bit serial number accessed on the AT24CS32-MAHM-T?
The 128-bit serial number on the AT24CS32-MAHM-T is accessed via a dedicated I²C address space using device type identifier '1011b' (0xB0–0xB7), distinct from the main EEPROM's '1010b' (0xA0–0xA7) base address. It resides in a read-only memory block physically separated from user memory and cannot be altered - a permanent, factory-programmed identity feature unique to the AT24CS32-MAHM-T within Microchip's CS Series.
What package type does the AT24CS32-MAHM-T use?
The AT24CS32-MAHM-T uses an 8-lead SOIC package (JEDEC MS-012AC), with body dimensions of 4.9 mm × 3.9 mm × 1.75 mm, matte tin lead finish, and RoHS-compliant green construction. This matches the package designation 'MAHM' in the part number and is confirmed in Microchip's DS20006341A datasheet Figure 1-1 and Package Marking section.
Can the AT24CS32-MAHM-T operate reliably at 1.7V?
Yes, the AT24CS32-MAHM-T is fully specified for operation at 1.7V, supporting I²C Standard Mode (100 kHz) and Fast Mode (400 kHz), with DC characteristics including ≤1.0 mA active read current and ≤1.0 µA standby current at this minimum VCC. Its low-voltage design enables direct integration with 1.8V microcontrollers and energy-constrained systems without level-shifting - a verified capability documented in Table 4-1 of the AT24CS32-MAHM-T datasheet.
AT24CS32-MAHM-T 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:
- 32Kbit
- Memory Organization:
- 4K 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)
AT24CS32-MAHM-T FAQ
1.How can I place an order for AT24CS32-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS32-MAHM-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 AT24CS32-MAHM-T reliable?
The price and inventory of AT24CS32-MAHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS32-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS32-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS32-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS32-MAHM-T?
AT24CS32-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS32-MAHM-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 AT24CS32-MAHM-T?
For technical support, including AT24CS32-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS32-MAHM-T requirements.
6.How does Aetrix verify that AT24CS32-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS32-MAHM-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 AT24CS32-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS32-MAHM-T?
All AT24CS32-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS32-MAHM-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 AT24CS32-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS32-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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