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Microchip Technology 24LC32AF-I/ST
- Part No.:
- 24LC32AF-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC32AF-I/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:344
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Product details
Overview
24LC32AF-I/ST 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). It features hardware write-protect for the upper 1/4 array (C00h–FFFh), 32-byte page write buffer, and 400 kHz max clock frequency. Used in embedded systems for parameter storage, calibration data retention, and configuration backup.
For engineers reviewing the 24LC32AF-I/ST datasheet, 24LC32AF-I/ST pinout, 24LC32AF-I/ST application, or 24LC32AF-I/ST equivalent, key selection criteria include VCC min (2.5V), WP-enabled quarter-array protection, I²C timing compliance at 400 kHz, standby current ≤1 μA, and TSSOP-8 package compatibility with board-level space constraints.
Technical Context
The 24LC32AF-I/ST implements a two-wire I²C interface with Schmitt-trigger inputs on SDA/SCL for noise immunity and slope-controlled outputs to suppress ground bounce. Its internal address counter supports current-address, random, and sequential read modes, while the 32-byte page buffer enables efficient multi-byte writes within physical page boundaries (0–31, 32–63, etc.).
Write protection is implemented via the WP pin: tied to VCC, it disables writes to addresses C00h–FFFh (16 KB), leaving lower 48 KB fully writable; tied to VSS, full array access is enabled. Acknowledge polling is supported to detect end-of-write-cycle without fixed delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit), enabling storage of firmware flags, sensor offsets, or device IDs |
| VCC operating 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) - supports high-speed I²C bus throughput in real-time systems |
| Page write time | 5 ms max - deterministic erase/write latency critical for fail-safe logging |
| Endurance | 1 million erase/write cycles - suitable for field-updatable calibration tables |
| Data retention | 200 years - ensures long-term reliability in unpowered storage applications |
| Standby current | 1 μA max (I-temp) - minimizes battery drain in always-on IoT edge nodes |
Pinout & Package
24LC32AF-I/ST is supplied in an 8-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and Pb-free. Pin functions are validated per Microchip DS22184A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | Hardwired to VSS/VCC to configure one of eight possible I²C slave addresses (1010xxx0/1) |
| A1 | Chip address input | Enables multi-device bus expansion up to 256 Kbit total address space when cascaded |
| A2 | Chip address input | Third address bit; all three (A0–A2) absent in SOT-23 variant but present in TSSOP-8 |
| VSS | Ground reference | Return path for all internal circuitry; requires low-impedance connection to system GND plane |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ typical for 400 kHz) |
| SCL | Serial clock input | Master-generated clock synchronizing all read/write transfers; Schmitt-triggered |
| WP | Write-protect control | Active-high enable: blocks writes to C00h–FFFh (16 KB); no effect on reads |
| VCC | Power supply | Accepts 2.5–5.5V; decoupling capacitor (0.1 μF ceramic) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-array hardware write-protect | Prevents accidental overwrites of critical firmware or calibration data stored in upper 16 KB |
| 32-byte page write buffer | Reduces I²C transaction overhead by up to 32× vs. byte-write mode for contiguous data updates |
| Schmitt-trigger inputs on SDA/SCL | Rejects fast transients <50 ns, eliminating need for external RC filtering in noisy industrial environments |
| Self-timed erase/write cycle | Eliminates external timing components; internal state machine handles voltage ramping and verification |
| ESD protection >4 kV | Withstands HBM ESD events common during board handling and field service operations |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Remote temperature/humidity sensor logging calibrated coefficients and fault history across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration store holding factory-trimmed gain/offset values and last-known operational state. Use Value: Enables zero-latency boot with validated sensor accuracy; 200-year data retention ensures lifetime calibration integrity. |
Use Scenario: Portable blood glucose meter storing user-specific calibration curves and usage logs. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault for FDA-regulated calibration data. Use Value: Hardware WP prevents runtime corruption of medical calibration constants; 1M-cycle endurance supports daily recalibration over 10+ years. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Utility-grade electricity meter retaining tariff schedules, pulse-count history, and tamper-event timestamps. IC Role / Device Role / Timing Role: High-reliability data logger interfacing via I²C to metrology SoC under intermittent power conditions. Use Value: 1 μA standby current extends backup battery life; 400 kHz I²C allows rapid firmware patch loading during maintenance windows. |
Use Scenario: Vehicle door module storing seat position presets, mirror angles, and lighting profiles per driver ID. IC Role / Device Role / Timing Role: Persistent settings repository accessible during ignition-on initialization and retained across battery disconnects. Use Value: TSSOP-8 footprint fits tight PCB spaces; industrial temp rating (–40°C to +85°C) ensures operation in under-hood thermal zones. |
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 (Microchip) | Same 32 Kbit capacity, 1.7–5.5V VCC range, but supports 1 MHz I²C and includes write-cycle suspend/resume | Better suited for high-throughput logging where bus arbitration must continue during writes | Select if 1 MHz speed or suspend capability is required; otherwise 24LC32AF-I/ST offers cost advantage |
| BR24G32FJ-3GE2 (Rohm) | 32 Kbit, 1.7–5.5V, 400 kHz, but uses different I²C address map (1010000x) and lacks hardware WP pin | Requires software-based protection; not drop-in for WP-dependent legacy designs | Choose only if board layout permits rework of WP routing and firmware can implement SW write lock |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AF-I/ST provides verified hardware write-protect for safety-critical storage and guaranteed 400 kHz timing at 2.5V - making it optimal for cost-sensitive industrial controllers where robustness outweighs peak speed.
Availability
24LC32AF-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, smart energy meters, automotive body modules, and embedded configuration backup requiring stable component supply and long-term lifecycle support.
Supply support for 24LC32AF-I/ST 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC32AF belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, designed specifically for low-power, space-constrained embedded systems requiring reliable nonvolatile storage with hardware-level data protection.
FAQ
What is the minimum VCC voltage required for reliable operation of the 24LC32AF-I/ST?
The 24LC32AF-I/ST requires a minimum VCC of 2.5V for full functionality, including 400 kHz I²C operation and guaranteed write performance. Operation below 2.5V is not specified - unlike the 24AA32AF variant, which supports down to 1.7V. This makes the 24LC32AF-I/ST ideal for 3.3V systems but unsuitable for sub-2.5V battery-powered designs. Always verify VCC stability during brown-out conditions to prevent partial writes in the 24LC32AF-I/ST.
How does the hardware write-protect (WP) pin function on the 24LC32AF-I/ST?
When the WP pin of the 24LC32AF-I/ST is tied to VCC, write operations to memory addresses C00h–FFFh (upper 16 KB, or 1/4 of the 32 Kbit array) are disabled; reads remain fully functional. If WP is tied to VSS, full array write access is enabled. The pin is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect. This hardware lock prevents firmware bugs or EMI-induced corruption of critical calibration data in the 24LC32AF-I/ST.
Can the 24LC32AF-I/ST be used in automotive applications?
The 24LC32AF-I/ST is rated for Industrial temperature range (–40°C to +85°C), not Automotive (–40°C to +125°C). While it may function in some under-dash locations, Microchip specifies the 24LC32AFE variant for AEC-Q100-compliant automotive use. Using the 24LC32AF-I/ST in safety-critical or high-temperature automotive systems violates qualification requirements and voids warranty. For body control modules requiring extended temp range, select the 24LC32AFE instead of the 24LC32AF-I/ST.
What is the maximum number of devices that can share the same I²C bus with the 24LC32AF-I/ST?
Up to eight 24LC32AF-I/ST devices can operate on a single I²C bus using unique combinations of A0, A1, and A2 address pins (3-bit chip address). Each device must have a distinct hardwired A0–A2 state (e.g., 000, 001, ..., 111) to generate unique 7-bit slave addresses (1010xxx0 for write, 1010xxx1 for read). The 24LC32AF-I/ST does not support dynamic addressing - all three pins must be statically set to VSS or VCC before communication begins.
Does the 24LC32AF-I/ST support page write across memory boundaries?
No - the 24LC32AF-I/ST restricts page writes to within a single 32-byte physical page (e.g., addresses 000h–01Fh, 020h–03Fh). Attempting a page write that crosses a boundary (e.g., starting at 01Eh with 5 bytes) causes wraparound: data overwrites the start of the same page instead of advancing to the next. Application firmware must calculate page alignment before issuing page writes. This behavior is inherent to the 24LC32AF-I/ST architecture and cannot be overridden.
24LC32AF-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 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-TSSOP
24LC32AF-I/ST FAQ
1.How can I place an order for 24LC32AF-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-I/ST 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 24LC32AF-I/ST reliable?
The price and inventory of 24LC32AF-I/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AF-I/ST is usually 5 days.
3.What payment methods are accepted for 24LC32AF-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-I/ST?
24LC32AF-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-I/ST 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 24LC32AF-I/ST?
For technical support, including 24LC32AF-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-I/ST requirements.
6.How does Aetrix verify that 24LC32AF-I/ST is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-I/ST 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 24LC32AF-I/ST meets industry standards.
7.What is the process for return or replacement of 24LC32AF-I/ST?
All 24LC32AF-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-I/ST, 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 24LC32AF-I/ST part is unused and in its original packaging.
Return procedure for 24LC32AF-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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