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Microchip Technology 24AA08HT-I/ST
- Part No.:
- 24AA08HT-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA08HT-I/ST.pdf
- Description:
- IC EEPROM 8KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
24AA08HT-I/ST from Microchip Technology Inc. is an 8 Kbit I²C-compatible serial EEPROM organized as four 256 × 8-bit blocks, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for memory addresses 200h–3FFh. It enables nonvolatile data storage in space-constrained embedded systems such as smart sensors and power management modules.
For engineers reviewing the 24AA08HT-I/ST datasheet, 24AA08HT-I/ST pinout, 24AA08HT-I/ST application, or 24AA08HT-I/ST equivalent, key selection criteria include low-voltage operation down to 1.7V, 16-byte page write buffer, Schmitt-trigger noise immunity on SDA/SCL, self-timed 5 ms write cycle, and TSSOP-8 packaging compatibility with automated PCB assembly.
Technical Context
The 24AA08HT-I/ST implements a standard I²C slave interface with fixed 4-bit device code '1010', block-select addressing (B2–B0), and R/W bit control - supporting byte and page writes up to 16 bytes within a single 16-byte physical page boundary. Its internal address pointer auto-increments during sequential reads and random-access operations.
It integrates VCC threshold detection disabling erase/write below 1.5V, Schmitt-trigger inputs with 0.05 VCC hysteresis, and output slope control to suppress ground bounce. Write protection is activated by tying WP to VCC, locking half the array (200h–3FFh) while permitting full read access across all 8 Kbit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1024 × 8), organized as four 256-word blocks for flexible partitioning |
| VCC operating range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic domains |
| I²C clock frequency | Up to 400 kHz (100 kHz when VCC < 2.5V) - supports high-speed firmware logging without bus contention |
| Page write buffer | 16-byte - reduces I²C transaction count for burst configuration storage, improving system latency |
| Write endurance | 1 million erase/write cycles - ensures reliability in frequent calibration or event-logging applications |
| Data retention | 200 years at +25°C - guarantees long-term validity of stored calibration constants or security keys |
| Standby current | 1 µA max - minimizes quiescent power in battery-backed real-time clocks and IoT edge nodes |
Pinout & Package
24AA08HT-I/ST is housed in an 8-lead TSSOP package (4.4 mm width), RoHS-compliant, with exposed pad not connected. Pin 1 is marked via laser etch or mold index; pin numbering follows standard counter-clockwise orientation from the notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | No internal connection - may be left floating or tied to VSS/VCC without affecting operation |
| A1 | Device address input | No internal connection - unused per datasheet; no impact on I²C address (fixed '1010') |
| A2 | Device address input | No internal connection - does not participate in slave addressing or block selection |
| VSS | Ground reference | System common return; must be low-impedance path to minimize noise coupling into SDA/SCL |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ for 400 kHz); carries address, data, ACK/NACK |
| SCL | Serial clock input | Master-generated clock; rising/falling edges synchronize data sampling and latching |
| WP | Hardware write-protect | Active-high enable: tie to VCC to lock addresses 200h–3FFh; tie to VSS for full read/write access |
| VCC | Power supply | 1.7–5.5V input; internal regulation ensures stable core voltage across supply range |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.7V - eliminates need for level shifters in 1.8V microcontroller systems |
| Schmitt-trigger inputs | Hysteresis ≥0.05 VCC on SDA/SCL - rejects >50 ns noise spikes without external filtering components |
| Page write capability | 16-byte buffer with automatic address increment - cuts I²C overhead by 94% vs. 16 individual byte writes |
| Hardware write-protect | Dedicated WP pin enabling selective locking of upper 2 Kbyte block - prevents accidental firmware corruption |
| ESD robustness | >4,000V HBM - sustains handling and board-level ESD events without latch-up or parametric shift |
Applications
| Smart Sensor Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in MEMS accelerometers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed at power-on reset via I²C; no timing-critical interaction required. Use Value: Enables plug-and-play sensor replacement without field recalibration; 200-year data retention preserves accuracy over equipment lifetime. |
Use Scenario: Holding user-defined I/O mapping, alarm thresholds, and communication settings in modular programmable logic controllers. IC Role / Device Role / Timing Role: Slave EEPROM providing persistent configuration storage; accessed asynchronously during setup or maintenance mode. Use Value: Survives repeated power cycling and firmware updates; 1M endurance supports daily reconfiguration in test environments. |
| Medical Device Usage Logs | Consumer Appliance Event History |
|
Use Scenario: Recording timestamped usage events (e.g., sterilization cycles, diagnostic runs) in portable ultrasound units. IC Role / Device Role / Timing Role: Low-power I²C slave storing sequential log entries; write-protected upper block secures critical audit data. Use Value: WP pin prevents tampering with regulatory-compliant event history; 1 µA standby current extends battery life between charges. |
Use Scenario: Tracking door-open counts, cycle completion timestamps, and error codes in smart refrigerators and washing machines. IC Role / Device Role / Timing Role: Embedded configuration and diagnostics memory interfaced to main MCU via shared I²C bus. Use Value: TSSOP-8 footprint fits tight control board layouts; 400 kHz speed allows rapid log updates during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC08BHT-I/ST | Requires minimum 2.5V VCC; otherwise identical pinout, timing, and memory map | Not suitable for 1.8V systems; acceptable where host MCU operates ≥2.5V | Select when system rail is ≥2.5V and cost sensitivity favors legacy 24LC part numbering |
| AT24C08D-SSHM-T | Same 8 Kbit capacity, TSSOP-8, I²C-compatible, but rated for 1.7–5.5V and offers 400 kHz operation | Includes write-cycle interrupt flag (WC pin); lacks dedicated WP pin - uses software write-protection only | Choose when interrupt-driven write completion signaling is needed and hardware WP is not mandatory |
Compared with 24AA08HT-I/ST, the 24LC08BHT-I/ST requires higher minimum supply voltage and offers no advantage in low-voltage designs, while the AT24C08D-SSHM-T provides alternate signaling but sacrifices hardware-based memory protection - making 24AA08HT-I/ST optimal for safety-critical or ultra-low-voltage deployments.
Availability
24AA08HT-I/ST is available at Aetrix Electronics and suitable for smart sensor calibration storage, industrial PLC configuration memory, and medical device usage logs requiring stable component supply across extended production lifecycles.
Supply support for 24AA08HT-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, serving automotive, industrial, and consumer markets with vertically integrated silicon and development tools.
The 24AA08H family delivers low-voltage, high-reliability serial EEPROMs optimized for embedded systems needing robust nonvolatile storage in space- and power-constrained environments.
FAQ
What is the minimum VCC required for reliable operation of the 24AA08HT-I/ST?
The 24AA08HT-I/ST operates reliably down to 1.7V across its full industrial temperature range (−40°C to +85°C). Below 1.7V, the internal voltage detector disables write functionality to prevent data corruption. This makes the 24AA08HT-I/ST suitable for direct integration with 1.8V microcontrollers without level-shifting circuitry.
Does the 24AA08HT-I/ST support page writes across memory boundaries?
No. The 24AA08HT-I/ST restricts page writes to within a single 16-byte physical page boundary (e.g., addresses 000h–00Fh, 010h–01Fh). Attempting to write across a boundary causes wraparound to the start of the same page, overwriting prior data. Application firmware must enforce alignment to avoid unintended data loss in the 24AA08HT-I/ST.
How does the WP pin function on the 24AA08HT-I/ST?
On the 24AA08HT-I/ST, the WP pin is a hardware write-protect enable: when tied to VCC, it locks memory addresses 200h–3FFh (upper 2 Kbyte block) against write operations while allowing full read access. When tied to VSS, all 8 Kbit remain writable. No internal pull-up/down is present - external biasing is required for deterministic behavior.
What is the typical write cycle time for the 24AA08HT-I/ST?
The 24AA08HT-I/ST specifies a maximum write cycle time of 5 ms for both byte and page writes, with typical performance near 3 ms. During this period, the device does not acknowledge I²C commands - a condition detectable via acknowledge polling to optimize bus utilization without fixed delays.
Is the 24AA08HT-I/ST compatible with standard I²C bus speeds?
Yes. The 24AA08HT-I/ST supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C operation. At VCC ≥ 2.5V, it achieves full 400 kHz compliance; below 2.5V, maximum clock frequency drops to 100 kHz. Rise/fall time specifications (TR/TF ≤ 1000 ns) ensure interoperability with standard I²C drivers and pull-up configurations.
24AA08HT-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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 8Kbit
- Memory Organization:
- 256 x 8 x 4
- 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
24AA08HT-I/ST FAQ
1.How can I place an order for 24AA08HT-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA08HT-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 24AA08HT-I/ST reliable?
The price and inventory of 24AA08HT-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 24AA08HT-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA08HT-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA08HT-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA08HT-I/ST?
24AA08HT-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA08HT-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 24AA08HT-I/ST?
For technical support, including 24AA08HT-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA08HT-I/ST requirements.
6.How does Aetrix verify that 24AA08HT-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA08HT-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 24AA08HT-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA08HT-I/ST?
All 24AA08HT-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA08HT-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 24AA08HT-I/ST part is unused and in its original packaging.
Return procedure for 24AA08HT-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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