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Microchip Technology AT24CS64-SSHM-B

Name: AT24CS64-SSHM-B
Brand: Microchip Technology
SKU: AT24CS64-SSHM-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24CS64-SSHM-B

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AT24CS64-SSHM-B.pdf

Description:: IC EEPROM 64KBIT I2C 1MHZ 8SOIC

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Product details

Overview

AT24CS64-SSHM-B from Microchip Technology is a 64-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 8,192 × 8 bits, operating from 1.7V to 5.5V, supporting 1 MHz Fast Mode Plus, and featuring hardware write protection via WP pin - used for secure device identification and configuration storage in industrial control modules.

For engineers reviewing the AT24CS64-SSHM-B datasheet, AT24CS64-SSHM-B pinout, AT24CS64-SSHM-B application, or AT24CS64-SSHM-B equivalent, key selection considerations include its guaranteed unique 128-bit serial number (non-volatile, non-overlapping across CS Series), 1,000,000 write endurance, 100-year data retention, ultra-low standby current (6 µA max), and support for cascaded multi-device I²C bus configurations up to eight units.

Technical Context

The AT24CS64-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. It supports three I²C speed modes: 100 kHz (1.7–5.5 V), 400 kHz (1.7–5.5 V), and 1 MHz FM+ (2.5–5.5 V), with clock timing compliant to I²C specification including tLOW/tHIGH, tSU.STA, and tHD.STA requirements.

Memory architecture comprises 256 pages of 32 bytes each, enabling partial page writes and sequential/random reads. The 128-bit serial number resides in a dedicated, read-only memory block addressed separately using device type identifier '1011b', physically isolated from user EEPROM space and permanently locked during wafer fabrication.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	64 Kbit (8,192 × 8), organized as 256 pages × 32 bytes - enables efficient firmware parameter storage with page-write granularity.
Supply voltage	1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters.
I²C speed modes	100 kHz / 400 kHz / 1 MHz FM+ - allows flexible timing trade-offs between noise immunity and throughput in mixed-voltage systems.
Write endurance	1,000,000 cycles - ensures reliable logging or calibration data updates over 10+ years in field-deployed equipment.
Data retention	100 years at 55°C - guarantees long-term integrity of stored serial numbers and configuration data without refresh.
Standby current	6 µA max at 5.0 V - minimizes power draw in battery-backed or energy-harvesting applications.
Serial number	128-bit factory-programmed, globally unique across all CS Series EEPROMs - eliminates need for external serialization infrastructure during manufacturing.

Pinout & Package

AT24CS64-SSHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), with gull-wing leads and RoHS-compliant matte tin plating.

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 one bus when hardwired to VCC/GND.
A1	Hardware device address input	Configures middle bit of 7-bit I²C slave address; same internal pull-down behavior as A0 - required for multi-drop addressing.
A2	Hardware device address input	Configures MSB of 7-bit I²C slave address; identical biasing behavior - completes 3-bit hardware address selection.
GND	Ground reference	System return path for VCC and all I/O signals; must be low-impedance connection to avoid noise coupling into SDA/SCL.
SDA	Bidirectional open-drain data line	Carries I²C data and ACK/NACK; requires external pull-up resistor ≤10 kΩ - shared across multiple slaves on same bus.
SCL	Input clock line	Controls data sampling timing; rising edge latches input, falling edge outputs data - must be pulled high externally or driven by master.
WP	Hardware write-protection enable	Active-high signal: tied to VCC blocks all writes to entire memory array; internally pulled down if floating - prevents accidental corruption during power transients.
VCC	Power supply input	1.7–5.5 V operation; includes internal POR circuit requiring ≥100 µs stabilization before first command - ensures robust startup in noisy environments.

Key Features

Feature	Design Value
Factory-programmed 128-bit serial number	Permanently written during wafer test; occupies dedicated memory block outside user space; uniqueness guaranteed across entire CS Series - removes serialization step from production line.
Three-speed I²C interface	Supports 100/400 kHz Standard/Fast mode and 1 MHz Fast Mode Plus with appropriate VCC - enables optimal bus timing selection per system voltage and noise environment.
Hardware write protection	WP pin disables all write operations when driven high; internal pull-down ensures safe default state - eliminates software-only protection vulnerabilities.
Noise-immune inputs	Schmitt triggers + digital filtering on SDA/SCL - suppresses EMI-induced glitches in industrial enclosures or motor-drive proximity.
Ultra-low power consumption	3 mA max active current, 6 µA max standby current at 5 V - extends battery life in portable diagnostic tools and sensor nodes.

Applications

Industrial PLC Configuration Storage	Medical Device Calibration Data
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile configuration register holding persistent settings accessible via I²C during boot and runtime reconfiguration. Use Value: Enables field-upgradable parameter sets without firmware reflashing; 100-year retention ensures data integrity across equipment lifecycle.	Use Scenario: Recording sensor calibration coefficients, usage counters, and regulatory compliance timestamps in portable ultrasound or infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit trails and device-specific calibration history. Use Value: Factory-programmed 128-bit serial number provides unforgeable device identity for traceability and anti-counterfeiting.
Smart Energy Meter Asset Tagging	Automotive Body Control Module ID
Use Scenario: Embedding unique meter IDs, firmware version stamps, and tariff schedule tables in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Dual-role memory: user EEPROM for tariff tables + dedicated serial number block for AMI network registration. Use Value: Eliminates need for separate UID chips; reduces BOM count and PCB area while meeting ANSI/IEC uniqueness requirements.	Use Scenario: Storing vehicle-specific configuration (e.g., mirror position presets, lighting profiles) and VIN-linked security keys in BCMs. IC Role / Device Role / Timing Role: I²C-accessible identity anchor tied to CAN gateway authentication handshake during ignition cycle. Use Value: Hardware WP pin prevents unauthorized reprogramming of safety-critical settings during service diagnostics.

Industrial PLC Configuration Storage

Medical Device Calibration Data

Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation cabinets.

IC Role / Device Role / Timing Role: Non-volatile configuration register holding persistent settings accessible via I²C during boot and runtime reconfiguration.

Use Value: Enables field-upgradable parameter sets without firmware reflashing; 100-year retention ensures data integrity across equipment lifecycle.

Use Scenario: Recording sensor calibration coefficients, usage counters, and regulatory compliance timestamps in portable ultrasound or infusion pumps.

IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit trails and device-specific calibration history.

Use Value: Factory-programmed 128-bit serial number provides unforgeable device identity for traceability and anti-counterfeiting.

Smart Energy Meter Asset Tagging

Automotive Body Control Module ID

Use Scenario: Embedding unique meter IDs, firmware version stamps, and tariff schedule tables in ANSI C12.22-compliant smart meters.

IC Role / Device Role / Timing Role: Dual-role memory: user EEPROM for tariff tables + dedicated serial number block for AMI network registration.

Use Value: Eliminates need for separate UID chips; reduces BOM count and PCB area while meeting ANSI/IEC uniqueness requirements.

Use Scenario: Storing vehicle-specific configuration (e.g., mirror position presets, lighting profiles) and VIN-linked security keys in BCMs.

IC Role / Device Role / Timing Role: I²C-accessible identity anchor tied to CAN gateway authentication handshake during ignition cycle.

Use Value: Hardware WP pin prevents unauthorized reprogramming of safety-critical settings during service diagnostics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C64D-SSHM-T	Lacks factory-programmed 128-bit serial number; identical 64-Kbit density, SOIC-8 package, and I²C timing - no hardware UID capability.	Suitable only where device-level serialization is handled externally or not required.	Select when cost sensitivity outweighs need for embedded UID; verify WP pin behavior matches legacy design.
M95640-DFMN6TP	SPI interface (not I²C); 64-Kbit density; operates 1.8–5.5 V; 5 ms write cycle - incompatible protocol, different pinout, no serial number.	Requires MCU SPI peripheral instead of I²C; no native support for multi-device bus addressing.	Choose only if existing design uses SPI and board layout cannot accommodate I²C routing changes.

Compared with AT24CS64-SSHM-B, AT24C64D-SSHM-T offers identical memory capacity and package but omits the critical 128-bit UID feature, while M95640-DFMN6TP replaces I²C with SPI - making both alternatives unsuitable for designs relying on guaranteed hardware serialization or I²C bus sharing with other slaves.

Availability

AT24CS64-SSHM-B is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply, long-term obsolescence management, and guaranteed factory-serialized identity.

Supply support for AT24CS64-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24CS64-SSHM-B belongs to Microchip's CS Series Serial EEPROM product line, engineered specifically to eliminate production-line serialization overhead while maintaining full compatibility with standard I²C EEPROM protocols and industrial temperature operation.

FAQ

What is the function of the WP pin on the AT24CS64-SSHM-B?

The WP (Write-Protect) pin on the AT24CS64-SSHM-B is a hardware enable input that, when driven high (to VCC), inhibits all write operations to the entire 64-Kbit memory array. When tied to GND or left floating (due to internal pull-down), normal read/write functionality is enabled. This feature prevents accidental overwrites during power-up transients or firmware errors, and is critical for safeguarding calibration data and serial number access in deployed AT24CS64-SSHM-B devices.

Does the AT24CS64-SSHM-B support 1 MHz I²C communication?

Yes, the AT24CS64-SSHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only within the 2.5 V to 5.5 V VCC range. At lower voltages (1.7–2.5 V), it defaults to 400 kHz Fast mode or 100 kHz Standard mode. This dual-voltage speed grading allows designers to maximize bus throughput in 3.3 V/5 V systems while retaining compatibility with low-voltage microcontrollers - a capability confirmed in the DS20006296A datasheet AC Characteristics table for the AT24CS64-SSHM-B.

How is the 128-bit serial number accessed on the AT24CS64-SSHM-B?

The 128-bit serial number on the AT24CS64-SSHM-B is accessed via a dedicated I²C device address using the 4-bit type identifier '1011b' (0xBx), distinct from the main EEPROM's '1010b' (0xAx) address. It resides in a read-only memory block physically separate from user memory, requires no special unlock sequence, and returns fixed 16-byte data on sequential reads starting from offset 0x00. This serial number is permanently programmed during Microchip's wafer test and cannot be altered - a core differentiator of the AT24CS64-SSHM-B versus generic EEPROMs.

What package type does the AT24CS64-SSHM-B use?

The AT24CS64-SSHM-B uses an 8-lead Small Outline Integrated Circuit (SOIC) package, 3.9 mm × 4.9 mm body size, 1.27 mm lead pitch, with gull-wing leads and RoHS-compliant matte tin finish. The 'SSHM-B' suffix explicitly denotes this SOIC variant, distinguishing it from TSSOP ('STSM') and UDFN ('UDFM') versions of the same AT24CS64 die. Pinout and thermal characteristics match JEDEC MS-012AC, and the package supports standard reflow soldering profiles per IPC-J-STD-020.

Is the AT24CS64-SSHM-B rated for industrial temperature operation?

Yes, the AT24CS64-SSHM-B is fully specified for industrial temperature operation from –40°C to +85°C, as documented in Section 4.2 of the DS20006296A datasheet. All electrical parameters - including I²C timing, supply current, and write endurance - are guaranteed across this range. The device incorporates on-die temperature compensation for the Power-on Reset (POR) circuit and maintains 6 µA max standby current even at +85°C, making it suitable for deployment in enclosed control cabinets, outdoor metering housings, and under-hood automotive modules where the AT24CS64-SSHM-B must retain data integrity without active cooling.

AT24CS64-SSHM-B Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 64Kbit

Memory Organization:: 8K 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

AT24CS64-SSHM-B FAQ

1.How can I place an order for AT24CS64-SSHM-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24CS64-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 AT24CS64-SSHM-B reliable?

The price and inventory of AT24CS64-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 AT24CS64-SSHM-B is usually 5 days.

3.What payment methods are accepted for AT24CS64-SSHM-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS64-SSHM-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24CS64-SSHM-B?

AT24CS64-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24CS64-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 AT24CS64-SSHM-B?

For technical support, including AT24CS64-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS64-SSHM-B requirements.

6.How does Aetrix verify that AT24CS64-SSHM-B is sourced from the original manufacturer or authorized distributors?

All AT24CS64-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 AT24CS64-SSHM-B meets industry standards.

7.What is the process for return or replacement of AT24CS64-SSHM-B?

All AT24CS64-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS64-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 AT24CS64-SSHM-B part is unused and in its original packaging.

Return procedure for AT24CS64-SSHM-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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