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Microchip Technology 24LC32AFT-E/ST
- Part No.:
- 24LC32AFT-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC32AFT-E/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
24LC32AFT-E/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 and automotive temperature support (–40°C to +125°C), 400 kHz max clock, 5 ms max page write time, and hardware write-protect for upper 1/4 array (C00h–FFFh). It targets low-power embedded systems requiring nonvolatile parameter storage in automotive body control modules.
For engineers reviewing the 24LC32AFT-E/ST datasheet, 24LC32AFT-E/ST pinout, 24LC32AFT-E/ST application, or 24LC32AFT-E/ST equivalent, key selection factors include VCC range compatibility (2.5–5.5V), automotive-grade temperature operation, quarter-array hardware write-protection, 32-byte page buffer, and SOT-23-5 package footprint constraints.
Technical Context
The 24LC32AFT-E/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slew-rate-controlled outputs to suppress noise and eliminate ground bounce. Its internal address counter supports current-address, random, and sequential read modes, while the 32-byte page write buffer enables efficient bulk writes within physical page boundaries (000h–01Fh, 020h–03Fh, etc.).
Write protection is enforced via the WP pin: tied to VCC, it inhibits writes to addresses C00h–FFFh (16 Kbits), leaving lower 16 Kbits fully writable; tied to VSS, full array access is enabled. Acknowledge polling is supported to detect write cycle completion without fixed delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 32 Kbit (4,096 × 8-bit) nonvolatile EEPROM array |
| VCC operating range | 2.5V to 5.5V - compatible with 3.3V and 5V logic systems, excludes 1.7V low-voltage mode |
| Max clock frequency | 400 kHz at VCC ≥ 2.5V - enables high-speed configuration loading in real-time systems |
| Page write buffer | 32 bytes - allows single-stop burst writes up to one full page, reducing bus overhead |
| Write-protect scope | Hardware-enforced protection of upper 16 Kbits (C00h–FFFh) when WP = VCC |
| Endurance & retention | 1 million erase/write cycles; >200 years data retention - suitable for infrequently updated calibration or security keys |
| Temperature grade | Automotive (E): –40°C to +125°C - qualified for under-hood and powertrain ECU use |
Pinout & Package
24LC32AFT-E/ST uses a 5-lead SOT-23 package (3.0 mm × 1.7 mm × 1.1 mm), omitting A0/A1/A2 address pins - fixed slave address '1010000' (0x50) with R/W bit. Pin functions are validated per DS22184A-page 5 Table 2-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SCL | Serial Clock input | Synchronizes all I²C transactions; requires external pull-up; Schmitt-triggered for noise immunity |
| 2: VSS | Ground reference | System common return; must be low-impedance connection to minimize ground bounce during SDA transitions |
| 3: SDA | Bidirectional data I/O | Open-drain output; requires external pull-up (2 kΩ typical for 400 kHz); supports ACK/NACK signaling |
| 4: VCC | Power supply | 2.5–5.5V input; decoupling capacitor (0.1 μF) required near pin for stable read/write operation |
| 5: WP | Write-protect control | Logic-high (VCC) disables writes to upper 16 Kbits; logic-low (VSS) enables full-array writes |
Key Features
| Feature | Design Value |
|---|---|
| Quarter-array hardware write-protect | Prevents accidental overwrites of critical firmware parameters or security keys stored in upper 16 Kbits |
| 32-byte page write buffer | Reduces I²C transaction count by up to 32× versus byte-write for contiguous configuration blocks |
| Schmitt-trigger SCL/SDA inputs | Rejects sub-50 ns noise spikes, enabling reliable operation in electrically noisy automotive environments |
| Automotive temperature qualification | Validated for continuous operation from –40°C to +125°C - meets AEC-Q100 stress test requirements |
| ESD protection | ≥4 kV HBM on all pins - eliminates need for external TVS diodes in most board-level ESD scenarios |
Applications
| Automotive Body Control Unit | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing door lock actuator timing profiles, mirror position presets, and seat memory settings across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding user-customized operational parameters accessible via I²C during MCU boot. Use Value: Enables persistent personalization without battery-backed SRAM; WP pin prevents corruption during firmware updates. | Use Scenario: Retaining factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Dedicated calibration data repository accessed once per power-on reset to configure ADC reference points. Use Value: Eliminates manual trim potentiometers; 1M-cycle endurance supports field recalibration over 10+ years of service. |
| Medical Device Configuration Backup | Smart Meter Firmware Parameter Storage |
Use Scenario: Safeguarding alarm thresholds, dosage limits, and user interface language preferences in portable infusion pumps. IC Role / Device Role / Timing Role: Fail-safe configuration store with write-protect enforced during normal operation to prevent runtime corruption. Use Value: Meets IEC 62304 software safety requirements; >200-year data retention ensures lifetime device integrity. | Use Scenario: Holding tariff tables, communication protocol keys, and tamper-detection event logs in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected nonvolatile memory for regulatory-critical operational parameters and audit trails. Use Value: Hardware WP prevents unauthorized modification of billing logic; automotive temp grade supports outdoor meter enclosures. |
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 | 32 Kbit I²C EEPROM, 1.7–5.5V VCC, industrial temp only (–40°C to +85°C), no automotive qualification | Lacks AEC-Q100 compliance; unsuitable for under-hood or powertrain use | Select only for cost-sensitive consumer or industrial designs without automotive thermal requirements |
| BR24G32FJ-3GE2 | 32 Kbit I²C EEPROM, 1.6–5.5V VCC, automotive temp (–40°C to +125°C), 16-byte page buffer (vs. 32-byte) | Smaller page buffer increases I²C transaction count for >16-byte writes; identical WP functionality | Prefer when footprint compatibility with ROHM's FJ-5 package is required; verify page-boundary handling in firmware |
Compared with AT24C32D-SSHM-T and BR24G32FJ-3GE2, the 24LC32AFT-E/ST uniquely combines automotive temperature rating, 32-byte page buffer, and quarter-array hardware write-protect in a compact SOT-23-5 package - optimizing for space-constrained, safety-critical automotive nodes.
Availability
24LC32AFT-E/ST is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor calibration storage, medical device configuration backup, and smart meter firmware parameter storage requiring stable component supply across extended product lifecycles.
Supply support for 24LC32AFT-E/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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24LC32AFT-E/ST belongs to Microchip's 24XX32AF family of I²C serial EEPROMs, engineered specifically for automotive and industrial applications demanding robust nonvolatile storage with hardware write protection and extended temperature reliability.
FAQ
What is the exact VCC operating voltage range for the 24LC32AFT-E/ST?
The 24LC32AFT-E/ST operates from 2.5V to 5.5V. Unlike the 24AA32AF variant, it does not support 1.7V operation. This range ensures compatibility with standard 3.3V and 5V microcontroller I/O domains while maintaining automotive-grade stability across temperature extremes.
Does the 24LC32AFT-E/ST support multiple devices on the same I²C bus?
No. The 24LC32AFT-E/ST uses the SOT-23-5 package, which omits A0, A1, and A2 address pins. Its slave address is fixed at 0x50 (1010000b), allowing only one device per I²C segment unless external multiplexing is used.
How does the write-protect (WP) pin function on the 24LC32AFT-E/ST?
When WP is tied to VCC, writes to memory addresses C00h–FFFh (upper 16 Kbits) are inhibited; reads remain fully functional. When WP is tied to VSS, full-array write access is enabled. WP state is sampled at the Stop bit of each write command - toggling WP mid-cycle has no effect.
What is the maximum page write size supported by the 24LC32AFT-E/ST?
The 24LC32AFT-E/ST supports a 32-byte page write buffer. Writes crossing physical page boundaries (e.g., starting at address 001Fh and writing 32 bytes) wrap around within the same page instead of advancing to the next - firmware must enforce alignment to 32-byte boundaries for predictable behavior.
Is the 24LC32AFT-E/ST qualified for automotive applications?
Yes. The "E" suffix denotes Automotive temperature grade (–40°C to +125°C), and the device is manufactured and tested to meet AEC-Q100 requirements. This qualification makes the 24LC32AFT-E/ST suitable for engine control, body electronics, and ADAS subsystems where extended thermal reliability is mandatory.
24LC32AFT-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC32AFT-E/ST FAQ
1.How can I place an order for 24LC32AFT-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AFT-E/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 24LC32AFT-E/ST reliable?
The price and inventory of 24LC32AFT-E/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 24LC32AFT-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AFT-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AFT-E/ST?
24LC32AFT-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AFT-E/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 24LC32AFT-E/ST?
For technical support, including 24LC32AFT-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AFT-E/ST requirements.
6.How does Aetrix verify that 24LC32AFT-E/ST is sourced from the original manufacturer or authorized distributors?
All 24LC32AFT-E/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 24LC32AFT-E/ST meets industry standards.
7.What is the process for return or replacement of 24LC32AFT-E/ST?
All 24LC32AFT-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AFT-E/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 24LC32AFT-E/ST part is unused and in its original packaging.
Return procedure for 24LC32AFT-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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