My Inquiry
My Account
Microchip Technology AT24CS08-SSHM-B
- Part No.:
- AT24CS08-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24CS08-SSHM-B.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:603
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT24CS08-SSHM-B from Microchip Technology is an 8-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 1,024 × 8-bit memory array, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports 100 kHz/400 kHz/1 MHz I²C bus speeds and includes hardware write protection via WP pin for secure firmware or calibration data storage in embedded control systems.
For engineers reviewing the AT24CS08-SSHM-B datasheet, AT24CS08-SSHM-B pinout, AT24CS08-SSHM-B application, or AT24CS08-SSHM-B equivalent, key selection considerations include its 8-pin SOIC package, 16-byte page write capability, ultra-low standby current (≤6 μA), permanent read-only serial number, and compatibility with standard I²C masters in space-constrained industrial and automotive subsystems.
Technical Context
The AT24CS08-SSHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1 MHz at VCC ≥ 2.5V). Its internal architecture includes a dedicated 128-bit one-time-programmable serial number block isolated from user memory.
It features hardware write protection via the WP pin (active-high), internally pulled-down address pins (A1 is NC, A2 is device address input), and power-on reset circuitry ensuring reliable initialization. Memory is organized into 64 pages of 16 bytes each, enabling partial page writes and self-timed write cycles completing within 5 ms maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1,024 × 8 bits) - provides sufficient nonvolatile storage for configuration, calibration, or device identity data without requiring external memory management logic. |
| Interface | I²C (Two-Wire Serial) - enables simple, low-pin-count connection to microcontrollers with standard I²C peripherals, reducing PCB routing complexity. |
| 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 long-term reliability in applications requiring frequent parameter updates, such as sensor calibration or usage logging. |
| Data Retention | 100 years at 55°C - guarantees persistent storage of critical identifiers or settings over full product lifecycle under elevated ambient conditions. |
| Standby Current | ≤6 μA at 5.5V - minimizes system power budget impact in battery-powered or energy-sensitive designs. |
| Serial Number | 128-bit factory-programmed, permanent, and globally unique across CS Series - eliminates need for external serialization during manufacturing and enables secure device authentication. |
Pinout & Package
AT24CS08-SSHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), with pin 1 marked by a notch or dot. All pins are surface-mount compatible and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice - no functional impact on AT24CS08 operation. |
| 2 (A2) | Device Address Input | Hard-wired to GND or VCC to configure one of two possible I²C slave addresses (0x50 or 0x51); enables up to two AT24CS08 devices on same bus. |
| 3 (GND) | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into sensitive I²C signaling. |
| 4 (VCC) | Power Supply | 1.7V–5.5V supply input; requires local 100 nF decoupling capacitor placed near pin for stable I²C timing and noise immunity. |
| 5 (WP) | Write-Protect Control | Active-high signal: tied to VCC disables all writes (full-array protection); tied to GND enables normal write operations; internally pulled down if floating. |
| 6 (SCL) | Serial Clock Input | Master-generated clock; open-drain compatible with external pull-up; rising edge latches input data, falling edge outputs data - requires ≤300 ns rise/fall time for 1 MHz operation. |
| 7 (SDA) | Serial Data Bidirectional | Open-drain bidirectional line shared across I²C bus; requires external pull-up resistor (≤10 kΩ); carries address, command, and data with ACK/NACK protocol. |
| 8 (NC) | No Connect | Internally unconnected; no electrical function - may be used as thermal pad or left unconnected per PCB design rules. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | 128-bit value permanently written during wafer test and locked - enables traceability and anti-cloning without consuming user memory or requiring post-silicon programming. |
| Hardware Write Protection | WP pin provides immediate, glitch-immune lockout of all write operations - critical for safeguarding calibration data or security keys against accidental or malicious overwrite. |
| Low-Voltage Operation | Functional down to 1.7V VCC - allows direct integration with modern ultra-low-power MCUs and battery-backed systems without voltage translation. |
| Noise-Resilient Interface | Schmitt-trigger inputs and spike suppression filters on SDA/SCL - ensure robust communication in electrically noisy industrial environments (e.g., motor drives, PLCs). |
| Page Write Efficiency | 16-byte page write mode with partial-page support - reduces write latency versus byte-by-byte writes and simplifies firmware implementation for burst data logging. |
Applications
| Industrial Sensor Node | Automotive Body Controller |
|---|---|
Use Scenario: Storing calibrated offset/gain coefficients and sensor-specific identification in a wireless temperature/humidity node operating on coin-cell battery. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 100-year data retention and <6 μA standby draw - directly extends battery life while preserving accuracy across field deployments. Use Value: Eliminates need for external serialization or host-based calibration storage, reducing BOM count and firmware complexity in mass-deployed IoT endpoints. | Use Scenario: Holding door-lock actuator calibration profiles and vehicle-specific VIN-linked settings in a CAN-connected body control module. IC Role / Device Role / Timing Role: Secure, write-protected memory for safety-critical parameters - WP pin prevents runtime corruption during ECU resets or electromagnetic transients. Use Value: Enables OEM-level personalization and regulatory compliance logging without exposing memory to software stack vulnerabilities or bus arbitration faults. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Recording dose history, maintenance logs, and device serial number for audit trail compliance in Class II medical equipment. IC Role / Device Role / Timing Role: Tamper-evident, high-endurance (1M cycle) storage for regulatory-mandated event logging - operates reliably across wide temperature (-40°C to +85°C) and low-voltage brownout conditions. Use Value: Meets IEC 62304 data integrity requirements using factory-locked serial number for unambiguous device identification in FDA-submitted documentation. | Use Scenario: Storing tariff tables, meter calibration constants, and firmware update metadata in a DIN-rail mounted electricity meter with 15+ year service life. IC Role / Device Role / Timing Role: Long-term nonvolatile memory with 100-year retention at 55°C - ensures accurate billing data persistence despite elevated enclosure temperatures in outdoor installations. Use Value: Avoids costly field replacements due to data loss, and leverages unique serial number for secure firmware signature verification during OTA updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C08D-SSHM-T | Same 8-Kbit capacity and SOIC-8 package, but lacks factory-programmed serial number and supports only 100/400 kHz I²C (no FM+). | No built-in device identity - requires external serialization or MCU-managed UID generation for traceability use cases. | Select when serial number is unnecessary and cost sensitivity outweighs long-term data authenticity requirements. |
| M95M01-RMN6TP | 1-Mbit SPI EEPROM in SOIC-8; higher density but different interface (SPI vs I²C), no serial number, 5V-only operation (4.5–5.5V). | Requires SPI-capable host and separate GPIO for chip select - incompatible with I²C-only controllers and unsuitable for mixed-voltage systems below 4.5V. | Choose only if migrating from I²C to SPI architecture and needing >8 Kbit capacity without serial number functionality. |
Compared with AT24C08D-SSHM-T, the AT24CS08-SSHM-B adds irreplaceable factory-serialized identity and 1 MHz I²C support for faster configuration loading; versus M95M01-RMN6TP, it offers lower-voltage operation, simpler two-wire wiring, and embedded security via immutable serial number - making it superior for compact, multi-voltage, identity-critical embedded systems.
Availability
AT24CS08-SSHM-B is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body controllers, medical infusion pumps, smart energy meters, and secure firmware update systems requiring stable component supply, long-lifecycle assurance, and guaranteed factory serialization.
Supply support for AT24CS08-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 a focus on reliability, longevity, and embedded system integration.
The AT24CS08-SSHM-B belongs to Microchip's CS Series Serial EEPROM product line, designed specifically for applications demanding guaranteed device uniqueness, low-power nonvolatile storage, and robust I²C interoperability in harsh industrial and automotive environments.
FAQ
What is the memory organization of the AT24CS08-SSHM-B?
The AT24CS08-SSHM-B contains 8,192 bits of EEPROM memory organized as 1,024 words × 8 bits, structured into 64 pages of 16 bytes each. This layout supports efficient 16-byte page writes and both random and sequential read operations. The AT24CS08-SSHM-B also includes a separate, permanently programmed 128-bit serial number block that does not consume any of the user-accessible memory space.
Does the AT24CS08-SSHM-B support 1 MHz I²C communication?
Yes, the AT24CS08-SSHM-B 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 to 2.5V), it operates in Fast Mode up to 400 kHz or Standard Mode up to 100 kHz. The AT24CS08-SSHM-B's Schmitt-triggered inputs and filtered timing ensure reliable 1 MHz performance in electrically noisy environments.
Is the 128-bit serial number on the AT24CS08-SSHM-B writable or modifiable?
No, the 128-bit serial number on the AT24CS08-SSHM-B is factory-programmed during wafer test and permanently locked - it is read-only and cannot be altered, erased, or reprogrammed after shipment. This serial number is globally unique across all Microchip CS Series EEPROMs, including AT24CS04 and AT24CS08 variants, and resides in a dedicated memory region outside the user-addressable 8-Kbit array.
What is the function of the A1 pin on the AT24CS08-SSHM-B?
The A1 pin on the AT24CS08-SSHM-B is a no-connect (NC) terminal - it has no internal connection and serves no functional purpose. Unlike the AT24CS04, which uses A1 as a second device address input, the AT24CS08-SSHM-B relies solely on the A2 pin for hardware address selection (0x50 or 0x51). The A1 pin may be left unconnected or tied to GND/VCC per board layout guidelines, with no effect on AT24CS08-SSHM-B operation.
How does the write-protect (WP) pin operate on the AT24CS08-SSHM-B?
The WP pin on the AT24CS08-SSHM-B is an active-high hardware write-protection input. When driven to VCC, it inhibits all write operations to the entire memory array; when tied to GND, normal read/write functionality is enabled. If left floating, the WP pin is internally pulled down to GND, enabling writes - however, Microchip recommends hard-wiring WP to a known state to prevent noise-induced corruption in industrial applications.
AT24CS08-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:
- 8Kbit
- Memory Organization:
- 1K 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
AT24CS08-SSHM-B FAQ
1.How can I place an order for AT24CS08-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-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 AT24CS08-SSHM-B reliable?
The price and inventory of AT24CS08-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 AT24CS08-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS08-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-SSHM-B?
AT24CS08-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-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 AT24CS08-SSHM-B?
For technical support, including AT24CS08-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-SSHM-B requirements.
6.How does Aetrix verify that AT24CS08-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS08-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 AT24CS08-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS08-SSHM-B?
All AT24CS08-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-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 AT24CS08-SSHM-B part is unused and in its original packaging.
Return procedure for AT24CS08-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT24CS08-SSHM-B Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
