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Microchip Technology 24LC32AF-E/ST
- Part No.:
- 24LC32AF-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24LC32AF-E/ST.pdf
- Description:
- IC EEPROM 32KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,245
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Product details
Overview
24LC32AF-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 serves in embedded systems requiring nonvolatile parameter storage under extended thermal conditions.
For engineers reviewing the 24LC32AF-E/ST datasheet, 24LC32AF-E/ST pinout, 24LC32AF-E/ST application, or 24LC32AF-E/ST equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), automotive-grade temperature operation, quarter-array hardware write-protection, 32-byte page buffer capability, and TSSOP-8 package footprint constraints.
Technical Context
The 24LC32AF-E/ST implements a two-wire I²C interface with Schmitt-trigger inputs and slope-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 (0–31, 32–63, etc.).
Write protection is enforced via the WP pin: tied to VCC, it disables writes to addresses C00h–FFFh (16 KB), leaving lower 3/4 (000h–BFFh) 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 (4K × 8-bit), enabling storage of firmware calibration data or device configuration tables |
| VCC operating range | 2.5V to 5.5V - compatible with 3.3V and 5V logic domains; excludes 1.7V low-voltage operation of 24AA32AF variant |
| Max clock frequency | 400 kHz at VCC ≥ 2.5V - supports high-speed I²C bus timing in compact embedded controllers |
| Page write buffer | 32 bytes - allows single-command writes up to one full page, reducing bus overhead vs. byte-by-byte writes |
| Write-protect scope | Hardware-enforced protection of upper 1/4 array (C00h–FFFh) - prevents accidental overwrite of critical system parameters |
| Endurance & retention | 1 million erase/write cycles and >200 years data retention - suitable for long-life industrial deployments |
| Temperature grade | Automotive (E): –40°C to +125°C - qualified for under-hood and powertrain control module use |
Pinout & Package
24LC32AF-E/ST is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | Hardwired logic level sets LSB of 3-bit slave address; enables up to eight devices on same I²C bus |
| A1 | Chip address input | Mid-bit of 3-bit slave address; must be stable before bus communication begins |
| A2 | Chip address input | MSB of 3-bit slave address; determines unique device identity in multi-drop configurations |
| VSS | Ground reference | System return path for all internal circuitry; requires low-impedance connection to minimize noise coupling |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up (2 kΩ typical for 400 kHz); carries address, command, and data |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input rejects noise on rising/falling edges |
| WP | Write-protect control | Active-high enable: when VCC, locks C00h–FFFh; when VSS, full array write access permitted |
| VCC | Power supply | 2.5–5.5V supply; powers EEPROM core, interface logic, and internal charge pump for write operations |
Key Features
| Feature | Design Value |
|---|---|
| I²C bus compatibility | Fully compliant with standard-mode (100 kHz) and fast-mode (400 kHz) I²C specifications, ensuring interoperability with MCU peripherals |
| Schmitt-trigger inputs | Input hysteresis ≥0.05 VCC on SDA/SCL eliminates false triggering from EMI or signal ringing in noisy automotive environments |
| Output slope control | Controlled rise/fall times prevent ground bounce during switching - critical for stable operation in mixed-signal PCB layouts |
| Self-timed write cycle | No external timing components required; internal oscillator manages 5 ms max erase/write - simplifies host firmware design |
| ESD protection | ≥4 kV HBM on all pins - meets AEC-Q100 stress requirements for automotive electronics reliability |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles across vehicle ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced via I²C to microcontroller; retains settings during battery disconnect. Use Value: Hardware write-protect (WP = VCC) prevents corruption of factory-calibrated values during field updates or diagnostics. | Use Scenario: Holding I/O mapping tables, PID tuning constants, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent storage for runtime-configurable parameters accessed during boot and operation. Use Value: Automotive-grade temperature range (–40°C to +125°C) ensures reliable operation inside sealed enclosures exposed to ambient extremes. |
| Medical Infusion Pump Calibration Data | Smart Energy Meter Firmware Parameters |
Use Scenario: Archiving flow-rate calibration coefficients, sensor offsets, and safety lockout states across maintenance intervals. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory storing traceable calibration records accessible only via authenticated host commands. Use Value: 1 million endurance cycles support daily recalibration over 10+ year product lifetime without wear-out concerns. | Use Scenario: Retaining tariff schedules, metering constants, and cryptographic keys in utility-grade electricity meters deployed outdoors. IC Role / Device Role / Timing Role: I²C EEPROM integrated into metrology subsystem for secure, long-term parameter persistence. Use Value: >200 years data retention guarantees integrity of billing-critical parameters throughout meter's service life. |
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/ST | Same 32 Kbit capacity and TSSOP-8 package, but rated for Industrial (I) grade only (–40°C to +85°C) | Lacks automotive temperature qualification; unsuitable for under-hood or engine-control applications | Select when cost sensitivity outweighs extended temperature requirement and ambient stays ≤85°C |
| AT24C32D-SSHM-T | 32 Kbit I²C EEPROM with 1.7–5.5V VCC range, 400 kHz clock, and industrial temp rating; different pinout (SOIC-8) | No automotive grade; lacks hardware write-protect for quarter-array - requires software-based protection schemes | Choose for legacy SOIC-8 board compatibility or ultra-low-voltage (1.7V) operation where 24LC32AF-E/ST's 2.5V min is insufficient |
Compared with 24LC32AT-I/ST, the 24LC32AF-E/ST adds automotive qualification and identical pinout; compared with AT24C32D-SSHM-T, it provides hardware-level write protection and guaranteed operation up to +125°C - both critical for safety-critical automotive and industrial control designs.
Availability
24LC32AF-E/ST is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC configuration storage, medical infusion pump calibration data retention, and smart energy meter firmware parameter management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 24LC32AF-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, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The 24LC32AF product line delivers automotive-qualified serial EEPROMs optimized for robust, low-power nonvolatile storage in space-constrained embedded systems requiring extended temperature operation and hardware write security.
FAQ
What is the minimum VCC voltage required for reliable operation of the 24LC32AF-E/ST?
The 24LC32AF-E/ST requires a minimum VCC of 2.5V for guaranteed operation across its full temperature range (–40°C to +125°C). Unlike the 24AA32AF variant, it does not support 1.7V operation. Below 2.5V, functionality is not assured, and I²C communication may fail or become unstable. Always maintain VCC within 2.5V–5.5V per the datasheet specification for 24LC32AF-E/ST.
Does the 24LC32AF-E/ST support page write operations, and what is the maximum number of bytes per page?
Yes, the 24LC32AF-E/ST supports page write operations with a 32-byte page buffer. A single write command can load up to 32 bytes into the buffer, which are then written to memory upon receipt of the Stop condition. Page boundaries align to 32-byte increments (e.g., 0x000–0x01F, 0x020–0x03F); crossing boundaries causes wraparound within the current page. This behavior is inherent to the 24LC32AF-E/ST architecture.
How does the Write-Protect (WP) pin function on the 24LC32AF-E/ST?
On the 24LC32AF-E/ST, the WP pin is active-high: when tied to VCC, write operations to memory addresses C00h–FFFh (upper 1/4, 16 KB) are inhibited, while reads remain functional; when tied to VSS, full array write access is enabled. The pin state is sampled at the Stop bit of each write command, and changes after that point have no effect on the ongoing write cycle of the 24LC32AF-E/ST.
Is the 24LC32AF-E/ST pin-compatible with other Microchip 32 Kbit EEPROMs in TSSOP-8 packages?
Yes, the 24LC32AF-E/ST is pin-compatible with other Microchip 32 Kbit I²C EEPROMs in TSSOP-8 packages, including the 24LC32AT-I/ST and 24AA32AF-I/ST. All share identical pin assignments (A0–A2, VSS, SDA, SCL, WP, VCC), same footprint, and compatible I²C protocol. However, voltage range and temperature grade differ - verify VCC and ambient requirements before substitution in the 24LC32AF-E/ST design.
What is the maximum I²C clock frequency supported by the 24LC32AF-E/ST, and under what conditions?
The 24LC32AF-E/ST supports a maximum I²C clock frequency of 400 kHz when VCC is 2.5V or higher. At VCC < 2.5V, operation is limited to 100 kHz - though this condition does not apply to the 24LC32AF-E/ST, as its minimum VCC is 2.5V. The 400 kHz capability enables faster parameter loading in time-sensitive applications without compromising signal integrity on properly terminated buses.
24LC32AF-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24LC32AF-E/ST FAQ
1.How can I place an order for 24LC32AF-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24LC32AF-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 24LC32AF-E/ST reliable?
The price and inventory of 24LC32AF-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 24LC32AF-E/ST is usually 5 days.
3.What payment methods are accepted for 24LC32AF-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24LC32AF-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24LC32AF-E/ST?
24LC32AF-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24LC32AF-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 24LC32AF-E/ST?
For technical support, including 24LC32AF-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24LC32AF-E/ST requirements.
6.How does Aetrix verify that 24LC32AF-E/ST is sourced from the original manufacturer or authorized distributors?
All 24LC32AF-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 24LC32AF-E/ST meets industry standards.
7.What is the process for return or replacement of 24LC32AF-E/ST?
All 24LC32AF-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24LC32AF-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 24LC32AF-E/ST part is unused and in its original packaging.
Return procedure for 24LC32AF-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24LC32AF-E/ST Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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