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Microchip Technology 24LC32AFT-E/MS
- Part No.:
- 24LC32AFT-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24LC32AFT-E/MS.pdf
- Description:
- IC EEPROM 32KBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,254
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Product details
Overview
24LC32AFT-E/MS 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 (–40°C to +85°C) and automotive-grade (–40°C to +125°C) variants. It features hardware write-protection for the upper 1/4 array (C00h–FFFh), 32-byte page write buffer, and Schmitt-trigger inputs for noise immunity. It is used in embedded systems for parameter storage, calibration data retention, and configuration backup in power-constrained applications.
For engineers reviewing the 24LC32AFT-E/MS datasheet, 24LC32AFT-E/MS pinout, 24LC32AFT-E/MS application, or 24LC32AFT-E/MS equivalent, key selection considerations include VCC range compatibility (2.5–5.5 V), quarter-array hardware write-protect functionality, MSOP-8 package footprint, I²C clock support up to 400 kHz, and endurance of >1 million erase/write cycles.
Technical Context
The 24LC32AFT-E/MS implements a two-wire I²C interface with slave addressing via A0–A2 pins (hardwired in MSOP-8 per datasheet Figure 2-1), supporting up to eight devices on one bus. Its internal architecture includes a 32-byte page latch, self-timed write cycle (≤5 ms), and address pointer auto-increment for sequential reads.
It uses CMOS EEPROM technology with Schmitt-trigger inputs on SDA/SCL for noise suppression, slope-controlled outputs to minimize ground bounce, and a dedicated WP pin that disables writes to addresses C00h–FFFh when pulled high. The device samples WP at the Stop bit of each write command and ignores subsequent toggles during the write cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4,096 × 8-bit), single-block organization enabling simple address mapping without bank switching |
| VCC Operating Range | 2.5 V to 5.5 V - supports standard 3.3 V and 5 V logic rails; not rated below 2.5 V (unlike 24AA32AF) |
| I²C Clock Frequency | Up to 400 kHz at VCC ≥ 2.5 V - enables faster firmware updates vs. 100 kHz legacy mode |
| Page Write Buffer | 32 bytes - allows efficient bulk writes within one page boundary (000h–01Fh, 020h–03Fh, etc.) |
| Write Protection | Hardware-enabled for upper 1/4 array (C00h–FFFh) via WP pin - prevents accidental overwrites of critical configuration data |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention - suitable for long-life industrial deployments |
| Supply Currents | Max 400 μA read current, max 1 μA standby (I-temp) - enables battery-backed operation in low-power nodes |
Pinout & Package
24LC32AFT-E/MS is packaged in an 8-lead MSOP (Mini Small Outline Package) with 0.65 mm pitch, body dimensions 3.0 mm × 3.0 mm × 1.0 mm (DS22184A-page 14), RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip Address Input | Hardwired to VSS or VCC to set LSB of 7-bit slave address (1010xxx); required for multi-device bus configuration |
| A1 | Chip Address Input | Hardwired to VSS or VCC to set middle bit of slave address; enables up to eight 24LC32AFT-E/MS devices on same I²C bus |
| A2 | Chip Address Input | Hardwired to VSS or VCC to set MSB of slave address; determines unique device ID within 1010xxx group |
| VSS | Ground Reference | System return path for all internal circuitry; must be connected to PCB ground plane with low-impedance trace |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ typical for 400 kHz); carries address, command, and data |
| SCL | Serial Clock Input | Master-generated clock synchronizing all I²C transfers; Schmitt-trigger input rejects noise on rising/falling edges |
| WP | Write-Protect Control | Logic-high disables writes to C00h–FFFh; sampled only at Stop bit - no effect if toggled mid-cycle |
| VCC | Power Supply | 2.5–5.5 V supply; decoupling capacitor (0.1 μF ceramic) required within 10 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-Array Hardware Write-Protect | Physically blocks writes to upper 8Kbit (C00h–FFFh) when WP = VCC - eliminates need for software lock bits or CRC checks |
| 32-Byte Page Write Buffer | Enables single-command writes of up to 32 contiguous bytes - reduces I²C transaction overhead by ~90% vs. byte-wise writes |
| Schmitt Trigger Inputs (SDA/SCL) | Input hysteresis ≥0.05×VCC - suppresses EMI-induced glitches in noisy industrial environments without external filtering |
| Self-Timed Write Cycle | Internal erase/write completes in ≤5 ms - frees host MCU from polling delay; ACK polling supported for precise timing control |
| ESD Robustness | ≥4,000 V HBM - withstands handling and board-level ESD events without latch-up or parametric shift |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offsets and gain coefficients in programmable logic controllers and environmental monitors. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed at power-on reset via I²C; retains data across 10+ year field deployments. Use Value: Eliminates recalibration labor and ensures traceable accuracy compliance (IEC 61508 SIL-2) without external backup batteries. |
Use Scenario: Holding patient-specific therapy parameters and device serialization data in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit logs and UDI metadata; WP pin protects regulatory-critical fields. Use Value: Meets ISO 13485 data integrity requirements with hardware-enforced write protection and >200-year retention. |
| Automotive Body Control Module | Smart Energy Metering |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and error codes in 12 V vehicle ECUs operating across –40°C to +125°C. IC Role / Device Role / Timing Role: Automotive-grade (E-temp) EEPROM interfaced to 8-bit microcontroller via 400 kHz I²C; survives load-dump transients. Use Value: Qualified to AEC-Q100 Grade 1; enables fail-safe recall of user preferences after ignition cycling without volatile RAM backup. |
Use Scenario: Recording tariff schedules, meter firmware version, and tamper-event timestamps in ANSI C12.20-certified utility meters. IC Role / Device Role / Timing Role: Long-term data logger with 1M-cycle endurance - withstands daily firmware updates and hourly billing writes for 10+ years. Use Value: Reduces BOM cost vs. FRAM while meeting ANSI/IEEE retention and write-cycle lifetime mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC32AT-I/MS | Same 32 Kbit capacity, MSOP-8, and I-temp rating (–40°C to +85°C), but lacks automotive qualification (E-temp). | Not qualified for under-hood or safety-critical automotive use; limited to commercial/industrial ambient conditions. | Select when automotive temperature range is unnecessary and cost optimization is prioritized. |
| AT24C32D-MAHM-T | 32 Kbit I²C EEPROM in 8-lead MSOP; supports 1.7–5.5 V VCC and 1 MHz clock (vs. 400 kHz max for 24LC32AFT-E/MS). | Higher-speed operation enables faster boot-time configuration loads; different WP implementation (no quarter-array granularity). | Choose when system requires >400 kHz I²C throughput or wider voltage range down to 1.7 V. |
Compared with 24LC32AT-I/MS, the 24LC32AFT-E/MS adds automotive qualification and extended temperature operation; compared with AT24C32D-MAHM-T, it trades maximum clock speed and low-voltage flexibility for hardware-based quarter-array write protection and Microchip's long-term supply assurance.
Availability
24LC32AFT-E/MS is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device manufacturing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24LC32AFT-E/MS 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 operations.
The 24LC32AFT-E/MS belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained, mission-critical embedded systems.
FAQ
What is the full operating temperature range for the 24LC32AFT-E/MS?
The 24LC32AFT-E/MS is rated for –40°C to +125°C (automotive E-temp grade), validated per AEC-Q100 stress testing. This exceeds standard industrial grade (–40°C to +85°C) and supports under-hood and engine-control applications where thermal stability is critical. The "E" suffix in the part number explicitly denotes this extended temperature qualification.
Does the 24LC32AFT-E/MS support I²C clock speeds above 400 kHz?
No - the 24LC32AFT-E/MS supports a maximum I²C clock frequency of 400 kHz at VCC ≥ 2.5 V. At lower voltages (below 2.5 V), it defaults to 100 kHz mode. Unlike some newer EEPROM families, it does not support FM+ (1 MHz) or high-speed I²C modes. This is confirmed in Table 1-2 of DS22184A.
How does the hardware write-protect feature work on the 24LC32AFT-E/MS?
The WP pin on the 24LC32AFT-E/MS disables write access to memory addresses C00h–FFFh (upper 8Kbit) when pulled high to VCC. Writes to 000h–BFFh remain enabled. The pin is sampled only at the Stop bit of each write command - toggling WP during an active write has no effect. This provides deterministic, hardware-level protection independent of firmware state.
Can multiple 24LC32AFT-E/MS devices share the same I²C bus?
Yes - the 24LC32AFT-E/MS uses three hardware address pins (A0, A1, A2) to configure its 7-bit slave address (base 1010xxx). With all combinations of A0–A2 tied to VSS or VCC, up to eight 24LC32AFT-E/MS devices can coexist on one I²C bus, enabling scalable memory expansion up to 256 Kbit without address conflicts.
What package type is used for the 24LC32AFT-E/MS?
The 24LC32AFT-E/MS uses an 8-lead MSOP (Mini Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body size, and 1.0 mm height. This surface-mount package is optimized for high-density PCB layouts and is distinct from PDIP, SOIC, TSSOP, TDFN, and SOT-23 variants offered in the same family.
24LC32AFT-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
24LC32AFT-E/MS FAQ
1.How can I place an order for 24LC32AFT-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AFT-E/MS 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-E/MS reliable?
The price and inventory of 24LC32AFT-E/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24LC32AFT-E/MS is usually 5 days.
3.What payment methods are accepted for 24LC32AFT-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AFT-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AFT-E/MS?
24LC32AFT-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AFT-E/MS 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-E/MS?
For technical support, including 24LC32AFT-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AFT-E/MS requirements.
6.How does Aetrix verify that 24LC32AFT-E/MS is sourced from the original manufacturer or authorized distributors?
All 24LC32AFT-E/MS 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-E/MS meets industry standards.
7.What is the process for return or replacement of 24LC32AFT-E/MS?
All 24LC32AFT-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AFT-E/MS, 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-E/MS part is unused and in its original packaging.
Return procedure for 24LC32AFT-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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