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Microchip Technology 24LC32AFT-I/SN
- Part No.:
- 24LC32AFT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24LC32AFT-I/SN.pdf
- Description:
- IC EEPROM 32KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
24LC32AFT-I/SN from Microchip Technology Inc. is a 32 Kbit I²C-compatible serial EEPROM organized as 4K × 8-bit memory, operating from 2.5V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for upper 1/4 array (C00h–FFFh). It serves as nonvolatile configuration storage in embedded control systems requiring low-power, noise-immune bus communication.
For engineers reviewing the 24LC32AFT-I/SN datasheet, 24LC32AFT-I/SN pinout, 24LC32AFT-I/SN application, or 24LC32AFT-I/SN equivalent, key selection criteria include VCC min (2.5V), page write buffer size (32 bytes), WP-enabled quarter-array protection, Schmitt-trigger SDA/SCL inputs, and TSSOP-8 package compatibility with standard I²C bus timing constraints.
Technical Context
The 24LC32AFT-I/SN implements a two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A2–A0), enabling up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, self-timed erase/write cycle, and address pointer auto-increment for sequential read/write operations.
It supports byte and page write modes, acknowledge polling for write-cycle completion detection, and current-address, random, and sequential read protocols. The device uses Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce-critical for reliable operation in electrically noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), sufficient for firmware parameter tables or calibration data in compact embedded nodes |
| VCC Range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains without level shifting |
| Max Clock Frequency | 400 kHz at VCC ≥ 2.5V - enables high-throughput configuration updates within standard I²C timing budgets |
| Page Write Buffer | 32 bytes - reduces I²C transaction count by 32× vs. byte-write for contiguous data blocks |
| Write Protection | Hardware-enforced protection of C00h–FFFh (upper 8 Kbit) via WP pin - prevents accidental overwrite of critical system data |
| Endurance & Retention | 1 million erase/write cycles and >200 years data retention - validated for long-life industrial deployments |
| Supply Currents | Read: ≤400 μA; Standby: ≤1 μA (I-temp) - extends battery life in always-on sensor nodes |
Pinout & Package
24LC32AFT-I/SN is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, RoHS-compliant matte tin finish, and JEDEC-standard footprint compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | LSB of 3-bit slave address; hardwired to VSS or VCC to select one of eight possible I²C addresses on shared bus |
| A1 | Chip Address Input | Middle bit of slave address; determines device identity in multi-EEPROM configurations |
| A2 | Chip Address Input | MSB of slave address; enables cascading up to eight 24LC32AFT-I/SN devices for 256 Kbit total address space |
| VSS | Ground Reference | Return path for all internal circuitry; must be low-impedance connection to minimize noise coupling |
| SDA | Serial Data I/O | Open-drain bidirectional bus line requiring external pull-up; carries address, command, and data during I²C transactions |
| SCL | Serial Clock Input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input ensures noise immunity |
| WP | Write-Protect Control | Active-high enable for hardware lock of upper 1/4 memory array; tied to VCC to prevent writes to C00h–FFFh |
| VCC | Power Supply | Single 2.5–5.5V supply powering EEPROM core and interface logic; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| I²C Bus Compatibility | Fully compliant with Philips I²C specification, supporting standard-mode (100 kHz) and fast-mode (400 kHz) timing without external protocol translation |
| Schmitt Trigger Inputs | SDA and SCL inputs incorporate hysteresis (≥0.05 VCC) to reject EMI-induced glitches and ensure robust start/stop detection |
| Output Slope Control | Controlled rise/fall times on SDA reduce ground bounce and EMI emissions, eliminating need for external series resistors |
| Quarter-Array Write-Protect | Hardware-level protection of 8 Kbit (C00h–FFFh) via dedicated WP pin - immune to software corruption or power-loss events |
| Low-Power Operation | Standby current ≤1 μA enables use in battery-backed systems where leakage must be minimized over years of storage |
Applications
| Industrial Sensor Node | Smart Meter Calibration Storage |
|---|---|
|
Use Scenario: A wireless temperature/humidity sensor node stores factory calibration coefficients, device ID, and last-reported values across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration and state storage; accessed infrequently via I²C during boot or wake-up, with minimal bus overhead. Use Value: 32-byte page write reduces I²C transaction time by 97% vs. byte writes; 1 μA standby current preserves coin-cell battery life for >10 years. |
Use Scenario: Electricity meter retains tariff tables, billing history, and tamper-event logs under frequent power interruptions and wide ambient temperature swings. IC Role / Device Role / Timing Role: Secure, long-term data archive; WP pin permanently locks tariff data region against unauthorized modification. Use Value: Hardware write-protect (C00h–FFFh) prevents firmware or utility updates from corrupting revenue-critical parameters; >200-year data retention meets regulatory archival requirements. |
| PLC I/O Module Configuration | Medical Diagnostic Device Settings |
|
Use Scenario: Programmable logic controller module stores channel scaling factors, alarm thresholds, and user-defined I/O mapping per installation site. IC Role / Device Role / Timing Role: Field-programmable parameter storage; written once during commissioning, read at every power-on reset. Use Value: 4K × 8-bit capacity accommodates full configuration set for 32-channel analog I/O; 2.5V minimum VCC ensures compatibility with 3.3V PLC backplane supplies. |
Use Scenario: Portable ultrasound or ECG device saves user preferences, probe calibration offsets, and last-used exam templates between clinical sessions. IC Role / Device Role / Timing Role: Patient- and operator-specific settings storage; accessed during GUI initialization with strict data integrity requirements. Use Value: 1 million endurance cycles support daily reconfiguration over 10+ years; ESD protection >4 kV safeguards against handling damage in clinical environments. |
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, 1.7–5.5V VCC range, but rated only to 105°C (not 125°C); no automotive grade option | Lacks automotive qualification; suitable for commercial/industrial use but not E-temp designs | Select if operating below +105°C and cost sensitivity outweighs extended temp requirement |
| BR24G32FJ-3GE2 | 32 Kbit, 1.6–5.5V VCC, supports 1 MHz I²C, but WP pin protects entire array-not configurable quarter-array | Higher speed and lower voltage, but lacks granular write-protection needed for mixed-access memory regions | Select when maximum bus throughput is critical and unified write-lock suffices for system security model |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AFT-I/SN uniquely combines industrial temperature rating, quarter-array hardware write-protect, and proven 400 kHz I²C interoperability-making it optimal for safety-critical or field-deployed systems requiring selective memory lockdown.
Availability
24LC32AFT-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering systems, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 24LC32AFT-I/SN 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The 24LC32AFT-I/SN belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, designed specifically for low-power, noise-immune nonvolatile storage in industrial automation, energy metering, and medical instrumentation.
FAQ
What is the minimum supply voltage required for reliable operation of the 24LC32AFT-I/SN?
The 24LC32AFT-I/SN requires a minimum VCC of 2.5V for guaranteed operation across its full industrial temperature range (–40°C to +85°C). Below 2.5V, functionality is not assured per datasheet specifications. This distinguishes it from the 24AA32AF variant, which supports down to 1.7V. The 24LC32AFT-I/SN is optimized for 3.3V and 5V systems where higher voltage margin improves noise immunity and timing margins.
How does the hardware write-protect feature function on the 24LC32AFT-I/SN?
The WP pin on the 24LC32AFT-I/SN provides hardware-level write inhibition for the upper 1/4 memory array (addresses C00h–FFFh) when driven high (VCC). When WP = VSS, full array write access is enabled. This protection is active during all write commands and cannot be overridden by software. The 24LC32AFT-I/SN does not support partial-array protection beyond this fixed quarter-region.
Can multiple 24LC32AFT-I/SN devices share the same I²C bus?
Yes, up to eight 24LC32AFT-I/SN devices can operate on a single I²C bus using unique slave addresses. Address bits A2, A1, and A0 (pins 1–3) determine the device's 3-bit identifier, combined with the fixed 4-bit control code '1010' to form a 7-bit address. All address pins must be hardwired to VSS or VCC; floating connections are undefined and must be avoided.
What is the maximum page write size supported by the 24LC32AFT-I/SN?
The 24LC32AFT-I/SN supports a maximum page write size of 32 bytes. Page boundaries align to integer multiples of 32 (e.g., 000h–01Fh, 020h–03Fh). Attempting to write across a boundary causes wraparound within the current page-not automatic advancement to the next page. Applications must enforce boundary alignment in firmware to avoid unintended data overwrite.
Is the 24LC32AFT-I/SN compatible with fast-mode I²C (400 kHz) at all supply voltages?
The 24LC32AFT-I/SN supports 400 kHz I²C operation only when VCC is ≥2.5V. At VCC <2.5V, maximum clock frequency drops to 100 kHz per datasheet AC characteristics. This voltage-dependent timing behavior is explicitly defined in Table 1-2 and must be accounted for in system-level bus arbitration and clock generation logic.
24LC32AFT-I/SN 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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24LC32AFT-I/SN FAQ
1.How can I place an order for 24LC32AFT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AFT-I/SN 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 24LC32AFT-I/SN reliable?
The price and inventory of 24LC32AFT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AFT-I/SN is usually 5 days.
3.What payment methods are accepted for 24LC32AFT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AFT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AFT-I/SN?
24LC32AFT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AFT-I/SN 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 24LC32AFT-I/SN?
For technical support, including 24LC32AFT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AFT-I/SN requirements.
6.How does Aetrix verify that 24LC32AFT-I/SN is sourced from the original manufacturer or authorized distributors?
All 24LC32AFT-I/SN 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 24LC32AFT-I/SN meets industry standards.
7.What is the process for return or replacement of 24LC32AFT-I/SN?
All 24LC32AFT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AFT-I/SN, 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 24LC32AFT-I/SN part is unused and in its original packaging.
Return procedure for 24LC32AFT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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