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Microchip Technology AT24CS32-XHM-B
- Part No.:
- AT24CS32-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS32-XHM-B.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
AT24CS32-XHM-B 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, and rated for -40°C to +85°C industrial temperature range. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds and includes hardware write protection via WP pin for full-array data security in embedded system configuration storage.
For engineers reviewing the AT24CS32-XHM-B datasheet, AT24CS32-XHM-B pinout, AT24CS32-XHM-B application, or AT24CS32-XHM-B equivalent, this page delivers verified package mapping (5-lead SOT23), confirmed pin functions (SCL/SDA/WP/VCC/GND), endurance (1,000,000 cycles), data retention (100 years), and real-world use cases including secure device identification and firmware parameter storage.
Technical Context
The AT24CS32-XHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SCL and SDA inputs, supporting bidirectional data transfer with ACK/NACK protocol and software reset capability. Its internal architecture includes a dedicated 128-bit read-only serial number block-physically separate from user memory-ensuring uniqueness across the entire CS Series without consuming user-addressable space.
It features an on-chip high-voltage generation circuit enabling byte and 32-byte page writes with self-timed erase/write cycles ≤5 ms, plus hardware write protection activated by pulling WP to VCC. Power management includes ultra-low standby current (≤6 µA at 5.5V) and active current (≤3 mA at 5.0V during write).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8), sufficient for storing boot parameters, calibration data, or device identity in space-constrained designs |
| I²C Speed Modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz FM+ (2.5–5.5V); enables flexible timing margin selection per host controller capability |
| Write Endurance | 1,000,000 cycles - supports frequent field-updatable configuration logging without premature wear-out |
| Data Retention | 100 years at 55°C - ensures long-term reliability for industrial equipment deployed without maintenance access |
| Supply Voltage | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V logic domains without level-shifting |
| Standby Current | ≤6 µA at 5.5V - critical for battery-backed systems requiring multi-year shelf life or low-power sleep states |
| Serial Number | 128-bit factory-programmed, permanent, read-only, globally unique across CS Series - eliminates need for external serialization infrastructure |
Pinout & Package
AT24CS32-XHM-B is packaged in a 5-lead SOT23 surface-mount package with exposed pad (not electrically connected). Pin assignments are validated per Microchip DS20006341A-page 3 and page 4 diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL | Serial Clock Input | Master-provided clock signal; rising edge latches input data, falling edge clocks output data; requires external pull-up |
| GND | Ground Reference | System ground return path for all internal circuitry and I/O biasing; must be low-impedance connection |
| SDA | Serial Data Bidirectional I/O | Open-drain bus line shared across multiple devices; requires external pull-up resistor ≤10 kΩ |
| WP | Hardware Write-Protect Control | Pulled high to VCC to disable all writes; internally pulled down when floating; prevents accidental overwrites during power transients |
| VCC | Power Supply Input | 1.7V–5.5V supply; monotonically ramped at ≤0.1 V/µs during power-up to ensure reliable POR behavior |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit value permanently locked during wafer test; occupies no user memory space and guarantees uniqueness across all CS Series EEPROMs |
| Multi-Voltage I²C Interface | Supports 100/400 kHz across full 1.7–5.5V range and 1 MHz FM+ above 2.5V - simplifies integration into mixed-voltage systems |
| Hardware Write Protection | WP pin disables all write operations when tied to VCC - provides fail-safe data integrity without software intervention |
| Noise-Resilient Inputs | Schmitt triggers and spike suppression filters on SCL/SDA enable robust operation in electrically noisy industrial environments |
| Page Write Architecture | 32-byte page buffer allows partial writes within a page - reduces bus traffic and improves update efficiency vs. byte-by-byte writes |
Applications
| Secure Device Authentication | Firmware Configuration Storage |
|---|---|
Use Scenario: Embedded gateway authenticating peripheral nodes in a smart building network using cryptographic keys bound to hardware identity. IC Role / Device Role / Timing Role: Non-volatile storage of immutable 128-bit serial number used as root-of-trust identifier during TLS handshake. Use Value: Eliminates need for external secure element or manufacturing-line serialization step while ensuring global uniqueness across product generations. | Use Scenario: Industrial PLC retaining calibrated sensor offsets and communication settings across power cycles and firmware updates. IC Role / Device Role / Timing Role: Persistent parameter store accessed via I²C during boot sequence; write-protected during normal operation via WP pin. Use Value: Enables field-reconfigurable operation without risk of corruption during brownout or reset events due to hardware-level write lock. |
| Asset Tracking Tag Memory | Medical Device Calibration Log |
Use Scenario: Battery-powered RFID-enabled asset tag recording last-known location and maintenance timestamp. IC Role / Device Role / Timing Role: Low-power EEPROM holding time-stamped operational history; accessed infrequently but requiring 100-year data retention. Use Value: Ultra-low standby current (≤6 µA) extends coin-cell battery life beyond 10 years while guaranteeing data integrity over equipment lifetime. | Use Scenario: Portable ultrasound probe storing per-transducer calibration coefficients and usage counters. IC Role / Device Role / Timing Role: High-reliability non-volatile memory subjected to >500,000 write cycles during clinical recalibration events. Use Value: 1,000,000 write endurance exceeds regulatory requirements for medical recalibration logs, reducing field failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-XHM-B | Same 32-Kbit capacity and SOT23-5 package, but lacks factory-programmed serial number; uses standard I²C address '1010' only | No built-in device identity - requires external serialization or software-managed UID generation | Select when serial number functionality is unnecessary and cost sensitivity outweighs traceability benefits |
| M24C32-WMN6TP | 32-Kbit I²C EEPROM in 8-lead SO8 package; supports 1 MHz FM+ only above 2.5V; no factory serial number; RoHS-compliant | Larger footprint and different pinout - not drop-in compatible; requires PCB redesign | Choose for legacy SOIC layouts or when higher pin count enables easier routing in dense boards |
Compared with AT24CS32-XHM-B, AT24C32D-XHM-B removes the 128-bit serial number but retains identical electrical specs and package, while M24C32-WMN6TP offers same density in SO8 but sacrifices both uniqueness and SOT23 compatibility - making AT24CS32-XHM-B the sole option for compact, identity-aware, drop-in serial EEPROM replacement.
Availability
AT24CS32-XHM-B is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and IoT edge node designs requiring stable component supply, guaranteed long-term availability, and compliance with RoHS, lead-free, and halide-free standards.
Supply support for AT24CS32-XHM-B 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The AT24CS32-XHM-B belongs to Microchip's CS Series of serial EEPROMs, engineered specifically for applications demanding guaranteed device uniqueness, low-voltage operation, and industrial-grade reliability without compromising on package miniaturization.
FAQ
What is the function of the WP pin on the AT24CS32-XHM-B?
The WP (Write-Protect) pin on the AT24CS32-XHM-B provides hardware-level write inhibition: when tied to VCC, it disables all write operations to the entire memory array, preventing accidental or malicious overwrites. When grounded or left floating (internally pulled down), normal read/write functionality is enabled. This feature is critical for safeguarding calibration data or firmware parameters in mission-critical systems using the AT24CS32-XHM-B.
Does the AT24CS32-XHM-B support 1 MHz I²C communication?
Yes, the AT24CS32-XHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation-but only when VCC is between 2.5V and 5.5V. Below 2.5V, it operates at up to 400 kHz (Fast Mode) or 100 kHz (Standard Mode). This voltage-gated speed scaling ensures timing compliance across its full 1.7V–5.5V supply range, a key specification confirmed in DS20006341A Table 4-3 for the AT24CS32-XHM-B.
How is the 128-bit serial number accessed on the AT24CS32-XHM-B?
The 128-bit serial number on the AT24CS32-XHM-B is accessed via a dedicated I²C device address prefix '1011b' (0xB0–0xB7), distinct from the main memory's '1010b' (0xA0–0xA7) address. It resides in a physically separate, read-only memory block that consumes no user memory space and is permanently programmed during Microchip's wafer test - a verified feature of the AT24CS32-XHM-B documented in DS20006341A Section 8.4.
What is the maximum write cycle time for the AT24CS32-XHM-B?
The maximum self-timed write cycle time for the AT24CS32-XHM-B is 5 ms, applicable to both byte and 32-byte page writes. This value is guaranteed across the full industrial temperature range (-40°C to +85°C) and supply voltage range (1.7V to 5.5V), as specified in DS20006341A Table 4-3 under parameter tWR - a critical timing constraint for real-time systems using the AT24CS32-XHM-B.
Is the AT24CS32-XHM-B compatible with 1.8V I²C buses?
Yes, the AT24CS32-XHM-B is fully compatible with 1.8V I²C buses: it operates down to 1.7V VCC and supports Standard Mode (100 kHz) and Fast Mode (400 kHz) across the entire 1.7V–5.5V range. Its Schmitt-triggered inputs and noise-filtered design ensure robust signal integrity at 1.8V logic levels, making it suitable for modern ultra-low-voltage microcontroller interfaces using the AT24CS32-XHM-B.
AT24CS32-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
AT24CS32-XHM-B FAQ
1.How can I place an order for AT24CS32-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS32-XHM-B 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-XHM-B reliable?
The price and inventory of AT24CS32-XHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS32-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS32-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS32-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS32-XHM-B?
AT24CS32-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS32-XHM-B 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-XHM-B?
For technical support, including AT24CS32-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS32-XHM-B requirements.
6.How does Aetrix verify that AT24CS32-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS32-XHM-B 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-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS32-XHM-B?
All AT24CS32-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS32-XHM-B, 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-XHM-B part is unused and in its original packaging.
Return procedure for AT24CS32-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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