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Microchip Technology AT24CS32-SSHM-B
- Part No.:
- AT24CS32-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS32-SSHM-B.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
AT24CS32-SSHM-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 secure data storage in embedded systems.
For engineers reviewing the AT24CS32-SSHM-B datasheet, AT24CS32-SSHM-B pinout, AT24CS32-SSHM-B application, or AT24CS32-SSHM-B equivalent, this page delivers verified electrical specs, validated pin functions across SOIC/TSSOP/UDFN/SOT23 variants, confirmed serial number architecture, endurance (1M cycles), retention (100 years), and real-world use cases in asset tracking, calibration storage, and secure boot configuration.
Technical Context
The AT24CS32-SSHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/WP pins. Its memory is partitioned into 128 pages of 32 bytes each, supporting byte and page writes with self-timed ≤5 ms write cycles.
It features dual-address space: standard EEPROM access using device type identifier '1010' (0xAh) and dedicated 128-bit serial number read using '1011' (0xBh), with the serial number permanently locked during wafer fabrication and occupying no user memory space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8), sufficient for firmware metadata, calibration tables, or device identity storage |
| Interface | I²C-compatible two-wire bus with 100/400 kHz Standard/Fast Mode and 1 MHz Fast Mode Plus support |
| Voltage Range | 1.7V to 5.5V operation enables direct integration with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| Write Endurance | 1,000,000 write cycles - suitable for frequent logging or parameter updates in industrial controllers |
| Data Retention | 100 years at 55°C - ensures long-term reliability in unattended equipment like smart meters or medical sensors |
| Serial Number | 128-bit factory-programmed, globally unique, read-only value - eliminates need for external serialization in production lines |
| Power Consumption | ≤3 mA active current, ≤6 µA standby - critical for battery-powered IoT nodes and portable diagnostics tools |
Pinout & Package
AT24CS32-SSHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), with pinout matching industry-standard 2-wire EEPROM layout. All pins are electrically validated per DS20006341A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Device Address Input | Configures LSB of 7-bit I²C slave address; internally pulled down if floating - enables up to 8 devices on same bus |
| A1 | Hardware Device Address Input | Configures middle bit of 7-bit I²C slave address; supports multi-device addressing without software reconfiguration |
| A2 | Hardware Device Address Input | Configures MSB of 7-bit I²C slave address; allows cascaded topology with zero firmware overhead |
| GND | Ground Reference | System ground connection point; required for stable logic thresholds and ESD path integrity |
| SDA | Serial Data Bidirectional I/O | Open-drain I²C data line requiring external pull-up; supports wire-OR with other slaves on shared bus |
| SCL | Serial Clock Input | Master-generated clock input with integrated noise filtering; latches input on rising edge, drives output on falling edge |
| WP | Hardware Write-Protect Control | Active-high pin disabling all writes when tied to VCC - prevents accidental corruption during power transitions or firmware faults |
| VCC | Power Supply Input | 1.7–5.5V supply rail; powers internal high-voltage generation circuit for EEPROM programming |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit immutable ID, guaranteed unique across entire CS Series - removes post-manufacturing serialization step and reduces BOM cost |
| Multi-Speed I²C Support | 100 kHz / 400 kHz / 1 MHz modes with voltage-scaled timing - enables optimal throughput in both low-power and high-speed host environments |
| Hardware Write Protection | Dedicated WP pin enabling full-array lock without software intervention - essential for bootloader configuration or regulatory compliance data |
| Noise-Resilient Interface | Schmitt triggers and input filters on SDA/SCL - maintains reliable communication in electrically noisy industrial enclosures or automotive harnesses |
| Low-Power Operation | 6 µA max standby current at 5.5V - extends battery life in wireless sensor nodes and portable test equipment |
Applications
| Asset Tracking Tag | Industrial Sensor Calibration |
|---|---|
Use Scenario: RFID-enabled logistics tag storing unique device ID, shipment history, and tamper flags across global supply chains. IC Role / Device Role / Timing Role: Nonvolatile identity storage with factory-assigned serial number and write-protected configuration fields. Use Value: Eliminates need for external serialization infrastructure; 100-year data retention ensures traceability over product lifetime. | Use Scenario: Pressure transducer in oilfield monitoring system storing factory calibration coefficients and field-adjusted offsets. IC Role / Device Role / Timing Role: Secure, low-power parameter storage accessible via I²C during sensor initialization or maintenance mode. Use Value: Hardware WP pin prevents runtime corruption; 1.7V operation supports brown-out resilience during intermittent power events. |
| Medical Diagnostic Device | Smart Energy Meter |
Use Scenario: Portable ultrasound probe storing usage logs, firmware version, and regulatory certification data for audit compliance. IC Role / Device Role / Timing Role: Tamper-evident configuration memory with permanent serial number used for device authentication and service history. Use Value: 128-bit serial number serves as cryptographic binding anchor; 1M write cycles support daily log entries for >2,700 years. | Use Scenario: Utility meter recording tariff schedules, billing intervals, and firmware update signatures in harsh outdoor environments. IC Role / Device Role / Timing Role: Industrial-grade nonvolatile memory retaining critical billing parameters across 15+ year deployments. Use Value: -40°C to +85°C rating ensures operation in unheated meter cabinets; green RoHS-compliant packaging meets utility environmental mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C32D-SSHM-T | Same 32-Kbit capacity and SOIC-8 package, but lacks factory-programmed 128-bit serial number; uses standard AT24Cxx addressing | No built-in serialization - requires external UID management or MCU-based hashing for device identity | Select when serial number functionality is unnecessary and cost sensitivity outweighs traceability requirements |
| M95320-DW DW | 32-Kbit SPI EEPROM (not I²C); 1.8–5.5V supply; no factory serial number; different pinout and protocol stack | Requires SPI host interface and separate GPIO for write protection; incompatible with existing I²C firmware | Select only when migrating to SPI-based architecture and redesigning PCB layout and driver software |
Compared with AT24C32D-SSHM-T, the AT24CS32-SSHM-B adds irreplaceable factory serialization without increasing footprint or voltage constraints; versus M95320-DW, it preserves I²C compatibility and simplifies firmware integration while delivering identical endurance and retention.
Availability
AT24CS32-SSHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart energy metering requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT24CS32-SSHM-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS32 belongs to Microchip's CS Series of serial EEPROMs, designed specifically to eliminate post-production serialization overhead while maintaining full backward compatibility with legacy AT24Cxx firmware and hardware layouts.
FAQ
What is the function of the WP pin on the AT24CS32-SSHM-B?
The WP (Write-Protect) pin on the AT24CS32-SSHM-B is a hardware-controlled enable/disable input for EEPROM write operations. When WP is tied to VCC, the entire memory array is locked against writes; when grounded, normal read/write access is permitted. Internally pulled down if left floating, it provides fail-safe protection during power-up or firmware errors - a key reliability feature for mission-critical AT24CS32-SSHM-B deployments.
Does the AT24CS32-SSHM-B support 1 MHz I²C communication?
Yes, the AT24CS32-SSHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only within the 2.5V to 5.5V VCC range. At 1.7V–2.5V, maximum speed is limited to 400 kHz Fast Mode. This voltage-gated timing ensures signal integrity and noise immunity - a design choice validated in DS20006341A AC Characteristics Table 4-3 for the AT24CS32-SSHM-B.
How is the 128-bit serial number accessed on the AT24CS32-SSHM-B?
The 128-bit serial number on the AT24CS32-SSHM-B is accessed via a dedicated I²C device address: the standard EEPROM address prefix '1010' (0xAh) is replaced with '1011' (0xBh) in bits 7–4 of the 7-bit slave address byte. This separate address space ensures the serial number occupies no user memory and remains permanently read-only - a verified behavior documented in Section 6.1 and Figure 6-1 of the AT24CS32-SSHM-B datasheet.
What is the endurance specification for the AT24CS32-SSHM-B?
The AT24CS32-SSHM-B guarantees 1,000,000 write cycles per memory location under specified conditions (TA = 25°C, VCC = 3.3V, page write mode), as confirmed in Table 4-6 of DS20006341A. This endurance applies to both standard EEPROM array and page-write operations - enabling robust usage in applications such as daily calibration updates or event logging where the AT24CS32-SSHM-B serves as primary nonvolatile storage.
Is the AT24CS32-SSHM-B compatible with standard AT24C32 firmware drivers?
Yes, the AT24CS32-SSHM-B is fully compatible with standard AT24C32 firmware drivers for basic read/write operations because it shares identical memory organization (4,096 × 8), I²C addressing scheme (A0–A2), and timing specifications. The only firmware extension needed is optional support for the 0xBh device address to access the 128-bit serial number - making the AT24CS32-SSHM-B a drop-in upgrade for serialization-aware systems.
AT24CS32-SSHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
AT24CS32-SSHM-B FAQ
1.How can I place an order for AT24CS32-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS32-SSHM-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-SSHM-B reliable?
The price and inventory of AT24CS32-SSHM-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-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS32-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS32-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS32-SSHM-B?
AT24CS32-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS32-SSHM-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-SSHM-B?
For technical support, including AT24CS32-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS32-SSHM-B requirements.
6.How does Aetrix verify that AT24CS32-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS32-SSHM-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-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS32-SSHM-B?
All AT24CS32-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS32-SSHM-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-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS32-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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