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Microchip Technology 24AA128T-I/ST
- Part No.:
- 24AA128T-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA128T-I/ST.pdf
- Description:
- IC EEPROM 128KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:22,363
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Product details
Overview
24AA128T-I/ST from Microchip Technology Inc. is a 128 Kbit (16K × 8) I²C-compatible serial EEPROM with 1.7V–5.5V single-supply operation, 400 kHz maximum clock frequency, and industrial temperature range (−40°C to +85°C). It features 64-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity-used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 24AA128T-I/ST datasheet, 24AA128T-I/ST pinout, 24AA128T-I/ST application, or 24AA128T-I/ST equivalent, key selection criteria include low-voltage operation down to 1.7V, guaranteed 1 million erase/write cycles, 200-year data retention, and compatibility with standard I²C bus timing at 400 kHz across full industrial temperature range.
Technical Context
The 24AA128T-I/ST implements a two-wire I²C interface with slave address decoding using A0–A2 pins, supporting up to eight devices on one bus. Its internal architecture includes a 64-byte page latch, HV generator for EEPROM programming, and memory control logic that enforces self-timed write cycles.
It uses Schmitt-trigger inputs on SDA/SCL for robust noise suppression and slope-controlled outputs to minimize ground bounce. Write protection is implemented via dedicated WP pin sampled at Stop condition, enabling hardware-level array lock without software overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128 Kbit (16,384 × 8), organized as contiguous 128K address space |
| VCC range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| Max clock frequency | 400 kHz at VCC ≥ 2.5V - supports high-speed I²C mode without requiring fast-mode+ controller |
| Page write buffer | 64 bytes - reduces write transaction count by up to 64× vs byte-write, improving system throughput |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field operation over product lifetime |
| Data retention | 200 years at +85°C - validated for long-term nonvolatile storage in unpowered conditions |
| Write current | 3 mA max - limits peak power draw during write, easing supply design in battery-powered systems |
| Standby current | 1 µA max (I-temp) - enables ultra-low-power sleep states in portable and IoT edge nodes |
Pinout & Package
24AA128T-I/ST is housed in an 8-lead TSSOP package (JEDEC MO-153, body width 4.4 mm), RoHS-compliant, with gull-wing leads and exposed pad not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip address input | LSB of 3-bit slave address; hardwired to VSS or VCC to configure device address on shared I²C bus |
| A1 | Chip address input | Middle bit of slave address; determines unique I²C address among up to eight devices |
| A2 | Chip address input | MSB of slave address; enables cascading of multiple 24AA128T-I/ST units for expanded storage |
| VSS | Ground reference | System common return path; must be low-impedance connection to avoid noise coupling into SDA/SCL |
| SDA | Serial data I/O | Open-drain bidirectional bus line; requires external pull-up resistor (2–10 kΩ depending on speed) |
| SCL | Serial clock input | Master-generated clock signal; synchronizes all read/write transfers and defines timing windows |
| WP | Hardware write-protect | Active-high enable: tied to VCC disables all writes while permitting unlimited reads |
| VCC | Power supply | Single 1.7–5.5V supply; powers internal charge pump, logic, and EEPROM array |
Key Features
| Feature | Design Value |
|---|---|
| I²C bus compatibility | Fully compliant with Philips I²C specification, including Start/Stop detection, ACK/NACK protocol, and 7-bit addressing |
| Low-voltage operation | Functional down to 1.7V - supports direct integration with 1.8V logic families and energy-harvesting systems |
| Noise-immune interface | Schmitt-trigger inputs + output slope control eliminate false triggering from EMI and ground bounce |
| Page write capability | 64-byte buffer allows burst writes within single I²C transaction, reducing bus arbitration overhead |
| Hardware write protection | Dedicated WP pin provides fail-safe, zero-software-overhead lock of entire 128K memory array |
| Extended reliability | 1M endurance cycles and 200-year data retention qualified per JEDEC JESD22-A117 and A110 standards |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients and real-time sensor drift compensation tables in a wireless temperature/humidity node. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during boot and runtime via I²C; no timing-critical latency requirements. Use Value: Enables field-replaceable sensor modules with persistent calibration data independent of host MCU firmware updates. |
Use Scenario: Retaining patient-specific therapy parameters and usage logs in portable insulin pumps and infusion controllers. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter archive with hardware write-lock (WP = VCC) after initial setup. Use Value: Meets IEC 62304 Class C safety requirements for data integrity and prevents accidental overwrite during operation. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Recording tariff schedules, billing cycle counters, and tamper-detection event timestamps in DIN-rail mounted meters. IC Role / Device Role / Timing Role: High-reliability data logger with 1M-cycle endurance; accessed infrequently but must survive 20+ years in sealed enclosure. Use Value: Eliminates need for battery-backed SRAM and avoids electrolytic capacitor aging concerns in mains-powered designs. |
Use Scenario: Storing seat/mirror position presets, door lock configurations, and lighting profiles in 12V automotive ECUs. IC Role / Device Role / Timing Role: Automotive-grade (AEC-Q100 qualified) EEPROM interfaced to 5V CAN/LIN microcontroller via I²C. Use Value: Qualified for −40°C to +85°C operation with 1.7V brownout tolerance ensures reliable recall after cold cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC128-I/ST | Requires minimum 2.5V VCC; identical pinout, timing, and memory organization | Not suitable for 1.8V systems; otherwise drop-in replacement where supply voltage permits | Select when operating exclusively from 3.3V/5V rails and cost sensitivity outweighs low-voltage flexibility |
| AT24C128-10PU-2.7 | 100 kHz max clock at 2.7V; different I²C address mapping (A0/A1/A2 default to 0); 1M endurance, same 128K density | Limited to 2.7–5.5V; lacks 1.7V support and AEC-Q100 qualification | Choose for legacy Atmel-based designs or cost-driven consumer applications without automotive/industrial requirements |
Compared with 24LC128-I/ST and AT24C128-10PU-2.7, the 24AA128T-I/ST uniquely supports 1.7V operation and AEC-Q100 qualification-making it the only option for battery-powered industrial sensors and automotive body electronics requiring extended voltage range and automotive reliability.
Availability
24AA128T-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for 24AA128T-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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 24AA128T-I/ST belongs to Microchip's 24XX128 family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile data storage in space-constrained embedded systems across industrial, medical, and automotive markets.
FAQ
What is the minimum operating voltage for the 24AA128T-I/ST?
The 24AA128T-I/ST operates down to 1.7V across its full industrial temperature range (−40°C to +85°C), enabling direct use with 1.8V microcontrollers and energy-harvesting power supplies. This is a key differentiator from the 24LC128 variant, which requires a minimum 2.5V supply.
Does the 24AA128T-I/ST support page write operations, and what is the buffer size?
Yes, the 24AA128T-I/ST supports page write operations with a 64-byte internal buffer. This allows up to 64 bytes to be written in a single I²C transaction, significantly reducing bus overhead compared to byte-wise writes and improving system-level write throughput.
How does hardware write protection work on the 24AA128T-I/ST?
The 24AA128T-I/ST uses a dedicated WP (Write-Protect) pin: when tied to VCC, all write operations-including byte, page, and erase-are inhibited while read operations remain fully functional. The pin is sampled at the Stop condition of each write command, providing deterministic, zero-software-overhead protection.
Is the 24AA128T-I/ST qualified for automotive applications?
Yes, the 24AA128T-I/ST is AEC-Q100 qualified for automotive applications. It meets stress test requirements for temperature cycling, humidity bias, and ESD (≥4 kV), and is rated for operation from −40°C to +85°C-making it suitable for body control, lighting, and infotainment subsystems.
What packages are available for the 24AA128T-I/ST, and what does the "T" suffix indicate?
The 24AA128T-I/ST is supplied in an 8-lead TSSOP package (SOIC narrow variant, 4.4 mm body width). The "T" in the part number explicitly denotes the TSSOP package type, distinguishing it from SOIC (SN), MSOP (MS), or DFN (MF) variants within the same 24AA128 family.
24AA128T-I/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:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 128Kbit
- Memory Organization:
- 16K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
24AA128T-I/ST FAQ
1.How can I place an order for 24AA128T-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA128T-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 24AA128T-I/ST reliable?
The price and inventory of 24AA128T-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 24AA128T-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA128T-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA128T-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA128T-I/ST?
24AA128T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA128T-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 24AA128T-I/ST?
For technical support, including 24AA128T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA128T-I/ST requirements.
6.How does Aetrix verify that 24AA128T-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA128T-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 24AA128T-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA128T-I/ST?
All 24AA128T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA128T-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 24AA128T-I/ST part is unused and in its original packaging.
Return procedure for 24AA128T-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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