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Microchip Technology AT24C32E-SSHM-T
- Part No.:
- AT24C32E-SSHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C32E-SSHM-T.pdf
- Description:
- IC EEPROM 32KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:119,857
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Product details
Overview
AT24C32E-SSHM-T from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support, and hardware write-protection via WP pin - used for nonvolatile configuration storage in embedded controllers and sensor modules.
For engineers reviewing the AT24C32E-SSHM-T datasheet, AT24C32E-SSHM-T pinout, AT24C32E-SSHM-T application, or AT24C32E-SSHM-T equivalent, key selection criteria include VCC voltage range compatibility, I²C bus speed mode support (Standard/Fast/Fast Mode Plus), page write capability (32-byte), endurance (1M cycles), and package-specific pin mapping for SOIC-8.
Technical Context
The AT24C32E-SSHM-T implements a two-wire I²C interface with Schmitt-triggered, filtered SCL/SDA inputs for noise immunity and supports bidirectional data transfer with ACK/NACK protocol. It uses an internal high-voltage generation circuit for EEPROM programming and includes Power-on Reset (POR) with 100 µs tPUP delay after stable VCC.
Memory is organized into 128 pages of 32 bytes each, enabling partial page writes and sequential/random reads. Device addressing uses hardwired A0–A2 pins (or internal pull-down in space-constrained packages) to allow up to eight devices on one bus, with fixed 1010b device type identifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8), sufficient for firmware calibration tables or device configuration registers |
| VCC range | 1.7V to 3.6V - enables direct interfacing with 1.8V/2.5V/3.3V microcontrollers without level shifters |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (Fast Mode Plus) - selectable per system timing budget and noise environment |
| Write endurance | 1,000,000 cycles - supports frequent logging or parameter updates in industrial control nodes |
| Data retention | 100 years at 55°C - ensures long-term reliability in unattended equipment |
| Active current | ≤1 mA max - minimizes power impact during read/write in battery-backed systems |
| Standby current | ≤0.8 µA max - critical for ultra-low-power sleep states in IoT endpoints |
| Write-protect | Hardware WP pin - prevents accidental overwrites during firmware updates or brown-out conditions |
Pinout & Package
AT24C32E-SSHM-T is supplied in an 8-lead SOIC package (SOIC-8, 150 mil width) with standard pinout and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | Hardwired to GND/VCC to set LSB of 7-bit I²C slave address; floating = internally pulled down |
| A1 | Device address input | Hardwired to GND/VCC to set middle bit of 7-bit I²C slave address; floating = internally pulled down |
| A2 | Device address input | Hardwired to GND/VCC to set MSB of 7-bit I²C slave address; floating = internally pulled down |
| GND | Ground reference | System ground connection; required for stable logic thresholds and ESD path |
| VCC | Power supply | 1.7V–3.6V supply input; must ramp monotonically ≤0.1 V/µs for reliable POR |
| WP | Write-protect control | Low = enable writes; high = full-array protection; floating = default enabled (pulled down) |
| SCL | Serial clock input | Open-drain compatible; requires external pull-up; rising edge latches input data |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up; falling edge outputs data |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write mode | Enables efficient burst writes without crossing page boundaries; partial writes supported |
| Schmitt-triggered inputs | Rejects fast transients and bus noise, improving robustness in electrically noisy industrial environments |
| Self-timed write cycle | Max 5 ms duration - eliminates need for host polling delay; ACK polling optional |
| ESD protection >4 kV | Meets HBM Class 2 requirements, reducing risk of field failure during handling or operation |
| Green packaging | Lead-free, halide-free, RoHS-compliant SOIC-8 - satisfies environmental compliance for global shipments |
Applications
| Industrial Sensor Node | Medical Diagnostic Module |
|---|---|
Use Scenario: Storing calibrated offset/gain coefficients and sensor linearization tables across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot or recalibration. Use Value: Enables field-upgradable calibration without firmware reflash; 100-year data retention ensures accuracy over product lifetime. | Use Scenario: Holding patient-specific settings, device usage logs, and safety-critical configuration flags. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware WP pin preventing runtime corruption. Use Value: Meets IEC 62304 software safety requirements for Class B medical devices via deterministic write protection. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Recording tariff schedules, metering history, and utility communication keys in harsh grid environments. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to MCU over 400 kHz I²C bus with noise filtering. Use Value: −40°C to +85°C operation and >4 kV ESD withstand ensure reliability in outdoor meter enclosures. | Use Scenario: Storing door lock actuation counts, window position memory, and lighting configuration profiles. IC Role / Device Role / Timing Role: Low-power configuration store accessed during wake-up from standby (<0.8 µA ISB). Use Value: Ultra-low standby current extends battery life in always-on vehicle subsystems between ignition cycles. |
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; updated revision with enhanced ESD (6 kV HBM) and tighter tWR spec (4.5 ms max) | Preferred for new designs requiring higher ESD immunity or faster write completion in time-critical systems | Select AT24C32D-SSHM-T if board layout allows drop-in replacement and qualification for 6 kV ESD is required. |
| M95320-WMN6TP | 32-Kbit SPI EEPROM (not I²C); 8-pin SOIC; 1.8V–5.5V VCC; 20 MHz SPI clock; no WP pin (software-controlled protection) | Suitable where SPI bus is already dominant and I²C resources are constrained; lacks hardware WP | Choose M95320-WMN6TP only when migrating from SPI-based architecture and hardware write protection is not mandatory. |
Compared with AT24C32D-SSHM-T, the AT24C32E-SSHM-T offers proven field reliability but lower ESD rating; versus M95320-WMN6TP, it provides native I²C integration and hardware write protection at the cost of SPI interface flexibility.
Availability
AT24C32E-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic modules, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for AT24C32E-SSHM-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 devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24C32E-SSHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power embedded systems requiring robust nonvolatile storage in space-constrained industrial and automotive applications.
FAQ
What is the maximum I²C clock frequency supported by AT24C32E-SSHM-T?
The AT24C32E-SSHM-T supports three I²C speed modes: Standard Mode up to 100 kHz (1.7V–3.6V), Fast Mode up to 400 kHz (1.7V–3.6V), and Fast Mode Plus up to 1 MHz (2.5V–3.6V). The actual achievable frequency depends on VCC level and bus capacitance - for 1 MHz operation, VCC must be ≥2.5V and total SDA/SCL capacitance ≤100 pF with appropriate pull-up resistors.
Does AT24C32E-SSHM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C32E-SSHM-T requires external pull-up resistors on both SDA and SCL lines because both pins are open-drain. Microchip specifies maximum pull-up values of 10 kΩ for Standard Mode (100 kHz), 4 kΩ for Fast Mode (400 kHz), and 1.3 kΩ for Fast Mode Plus (1 MHz), assuming CL = 100 pF. Failure to install pull-ups will prevent proper I²C communication.
How does the Write-Protect (WP) pin function on AT24C32E-SSHM-T?
On AT24C32E-SSHM-T, the WP pin provides hardware-level write protection: when tied to VCC, all memory writes (byte and page) are inhibited; when tied to GND, normal write operations are enabled. If left floating, the internal weak pull-down defaults WP to GND (write enabled), but Microchip recommends hardwiring WP to a defined state to avoid noise-induced glitches.
What is the memory organization of AT24C32E-SSHM-T and how does it affect write operations?
AT24C32E-SSHM-T organizes its 32-Kbit memory as 128 pages × 32 bytes. This structure enables 32-byte page writes, where addresses within a single page can be written sequentially without issuing new start conditions. Crossing a page boundary during a page write terminates the operation - so software must manage address alignment to maximize write efficiency.
Is AT24C32E-SSHM-T compatible with 1.8V microcontrollers?
Yes, AT24C32E-SSHM-T is fully compatible with 1.8V microcontrollers: it operates down to 1.7V VCC, supports I²C Standard and Fast Modes at 1.7V–3.6V, and has VIH minimum of 0.7×VCC (≥1.26V at 1.8V) and VIL maximum of 0.3×VCC (≤0.54V), ensuring reliable logic level recognition. Its 0.08 µA typical standby current also suits ultra-low-power 1.8V systems.
AT24C32E-SSHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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:
- 450 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C32E-SSHM-T FAQ
1.How can I place an order for AT24C32E-SSHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C32E-SSHM-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 AT24C32E-SSHM-T reliable?
The price and inventory of AT24C32E-SSHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C32E-SSHM-T is usually 5 days.
3.What payment methods are accepted for AT24C32E-SSHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C32E-SSHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C32E-SSHM-T?
AT24C32E-SSHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C32E-SSHM-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 AT24C32E-SSHM-T?
For technical support, including AT24C32E-SSHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C32E-SSHM-T requirements.
6.How does Aetrix verify that AT24C32E-SSHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C32E-SSHM-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 AT24C32E-SSHM-T meets industry standards.
7.What is the process for return or replacement of AT24C32E-SSHM-T?
All AT24C32E-SSHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C32E-SSHM-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 AT24C32E-SSHM-T part is unused and in its original packaging.
Return procedure for AT24C32E-SSHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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