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Microchip Technology 24AA01-I/ST
- Part No.:
- 24AA01-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24AA01-I/ST.pdf
- Description:
- IC EEPROM 1KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
24AA01-I/ST from Microchip Technology is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency at 2.5–5.5 V, and industrial temperature range (−40°C to +85°C). It operates down to 1.7 V, features Schmitt-trigger inputs, slope-controlled outputs, and supports byte/page writes in embedded microcontroller systems for configuration storage.
For engineers reviewing the 24AA01-I/ST datasheet, 24AA01-I/ST pinout, 24AA01-I/ST application, or 24AA01-I/ST equivalent, this page delivers verified electrical specs, SOIC-8 package details, I²C timing constraints, endurance (1M cycles), data retention (>200 years), and real-world substitution guidance - all grounded in Microchip DS20001711M.
Technical Context
The 24AA01-I/ST implements a 2-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting current-address, random, and sequential read modes. Its internal Address Pointer auto-increments during reads and wraps on page boundaries.
It uses an on-chip HV generator for EEPROM programming, integrates 8-byte page write buffering, and relies on acknowledge polling to detect write completion. Write protection is implemented via the dedicated WP pin tied to VCC or VSS - no internal pull-ups or logic decoding required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit), sufficient for small firmware config tables or calibration data in space-constrained designs |
| VCC Range | 1.7 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Max Clock Frequency | 400 kHz at VCC ≥ 2.5 V; 100 kHz at 1.7 V ≤ VCC < 2.5 V - defines achievable bus throughput under low-voltage operation |
| Write Cycle Time | ≤5 ms per byte or page - determines minimum delay before next I²C transaction can begin |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry or logging applications |
| Data Retention | >200 years at +25°C - ensures long-term reliability for unattended industrial deployments |
| Standby Current | ≤1 µA at I-temp - critical for battery-powered devices requiring ultra-low quiescent power |
Pinout & Package
24AA01-I/ST is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package, 3.90 mm body width, with standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address Input | No internal connection; may be left floating or tied to VSS/VCC - no effect on device addressing |
| A1 | Address Input | No internal connection; no impact on I²C address resolution or memory access |
| A2 | Address Input | No internal connection; unused in 24AA01 family - simplifies PCB routing |
| VSS | Ground | Reference node for all digital and analog circuitry; must be low-impedance to minimize noise coupling |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2–10 kΩ); carries address, data, and ACK/NACK signals |
| SCL | Serial Clock Input | Input-only clock line synchronized to host controller; edge-sensitive for Start/Stop detection |
| WP | Write-Protect Control | Logic-level input: VSS enables full read/write; VCC disables all writes while preserving read capability |
| VCC | Power Supply | Single supply rail powering EEPROM core and I/O buffers; decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt Trigger Inputs | Input hysteresis ≥0.05×VCC eliminates false triggering from bus noise or slow signal edges |
| Output Slope Control | Controlled SDA/SCL rise/fall times prevent ground bounce and EMI in high-speed or dense layouts |
| Page Write Buffer | 8-byte buffer enables burst writes within one I²C transaction - reduces protocol overhead vs. byte-by-byte writes |
| Hardware Write-Protection | Dedicated WP pin provides tamper-resistant, non-software-dependent memory lockout - critical for secure boot or calibration data |
| ESD Protection | ≥4 kV HBM on all pins - improves robustness during handling and board assembly without external TVS |
Applications
| Industrial Sensor Node | Medical Diagnostic Device |
|---|---|
Use Scenario: Storing calibrated sensor offsets and linearization coefficients across power cycles in a wireless temperature/humidity node. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed via I²C during MCU initialization; no timing-critical interaction during runtime. Use Value: Enables field recalibration without firmware update; 1 µA standby current extends battery life >10 years in sleep mode. | Use Scenario: Holding patient-specific calibration profiles and usage logs in a portable glucose meter with replaceable test-strip cartridges. IC Role / Device Role / Timing Role: Secure, write-protected storage of regulatory-compliant calibration data; WP pin hardwired to VCC prevents accidental overwrites. Use Value: Meets IEC 62304 software safety requirements via hardware-enforced write lock; >200-year data retention ensures lifetime traceability. |
| Smart Home Controller | Automotive Body Control Module |
Use Scenario: Saving user preferences (light scenes, schedules, device pairings) in a Zigbee-enabled home hub after each change. IC Role / Device Role / Timing Role: Low-power I²C slave storing infrequently updated but mission-critical settings; accessed only on user action or reboot. Use Value: 1.7 V operation allows direct connection to 1.8 V SoC I/O rails; 1 M-cycle endurance supports >100 daily writes for 27 years. | Use Scenario: Recording door lock actuation history and window position limits in a LIN-connected BCM for diagnostic reporting. IC Role / Device Role / Timing Role: AEC-Q100 qualified nonvolatile memory for automotive-grade event logging; interfaces via MCU's I²C peripheral. Use Value: Industrial temp rating (−40°C to +85°C) matches under-hood thermal envelope; RoHS compliance meets OEM material requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC01B-I/ST | Requires minimum 2.5 V VCC; same 400 kHz speed and SOIC-8 package; identical pinout and command set | Not suitable for 1.7–2.4 V systems; otherwise drop-in replacement where voltage margin permits | Select when system VCC is guaranteed ≥2.5 V and cost sensitivity favors legacy part availability |
| 24FC01-I/ST | Supports 1 MHz I²C up to 5.5 V; same 1.7 V min; enhanced endurance spec (1M cycles) and extended temp option | Enables higher bus throughput in bandwidth-constrained designs; requires validation of 1 MHz timing margins | Choose for new designs needing faster writes or future-proofing for extended temperature operation |
Compared with 24LC01B-I/ST, 24AA01-I/ST enables lower-voltage operation; compared with 24FC01-I/ST, it trades maximum speed for broader legacy compatibility and simpler timing validation at 400 kHz.
Availability
24AA01-I/ST is available at Aetrix Electronics and suitable for industrial sensor nodes, medical diagnostic devices, smart home controllers, and automotive body control modules requiring stable component supply across multi-year production cycles.
Supply support for 24AA01-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 design and manufacturing operations.
The 24AA01 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in cost-sensitive embedded systems where simplicity, longevity, and wide supply voltage range are essential.
FAQ
What is the maximum I²C clock frequency supported by the 24AA01-I/ST?
The 24AA01-I/ST supports up to 400 kHz when VCC is 2.5 V or higher. At VCC between 1.7 V and 2.4 V, the maximum clock frequency drops to 100 kHz to ensure reliable timing margins. This dual-speed behavior is defined in Microchip DS20001711M Table 1-2 and must be accounted for in low-voltage system designs using the 24AA01-I/ST.
Does the 24AA01-I/ST require external pull-up resistors on SDA and SCL lines?
Yes, the 24AA01-I/ST requires external pull-up resistors on both SDA and SCL because its I²C interface uses open-drain outputs. Typical values are 10 kΩ for 100 kHz operation and 2 kΩ for 400 kHz. The exact value depends on bus capacitance and desired rise time, as specified in DS20001711M Section 2.2 - failure to install pull-ups will prevent communication with the 24AA01-I/ST.
How does hardware write-protection work on the 24AA01-I/ST?
Hardware write-protection on the 24AA01-I/ST is controlled by the WP pin: tying WP to VCC disables all write operations (byte and page) while allowing unrestricted reads; tying WP to VSS enables full read/write access. No internal register configuration is needed - the function is purely pin-level and active immediately upon power-up, making it ideal for safeguarding calibration data in the 24AA01-I/ST.
Can the 24AA01-I/ST be used in automotive applications?
The 24AA01-I/ST itself is not AEC-Q100 qualified; however, the broader 24XX01 family includes AEC-Q100 qualified variants like the 24AA01HT-I/ST. For automotive body control or infotainment modules requiring qualification, engineers should select the HT-grade version. The 24AA01-I/ST remains suitable for non-safety-critical, non-automotive-qualified applications such as industrial controls or consumer electronics.
What is the purpose of the A0, A1, and A2 pins on the 24AA01-I/ST?
The A0, A1, and A2 pins on the 24AA01-I/ST are not internally connected and serve no functional purpose. They may be left floating or tied to VSS or VCC without affecting device operation, addressing, or memory access. This design simplifies PCB layout and eliminates the need for external termination resistors - a key differentiator from higher-density EEPROMs that use these pins for device addressing in multi-drop I²C buses.
24AA01-I/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:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 3500 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
24AA01-I/ST FAQ
1.How can I place an order for 24AA01-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA01-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 24AA01-I/ST reliable?
The price and inventory of 24AA01-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 24AA01-I/ST is usually 5 days.
3.What payment methods are accepted for 24AA01-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA01-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA01-I/ST?
24AA01-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA01-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 24AA01-I/ST?
For technical support, including 24AA01-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA01-I/ST requirements.
6.How does Aetrix verify that 24AA01-I/ST is sourced from the original manufacturer or authorized distributors?
All 24AA01-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 24AA01-I/ST meets industry standards.
7.What is the process for return or replacement of 24AA01-I/ST?
All 24AA01-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24AA01-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 24AA01-I/ST part is unused and in its original packaging.
Return procedure for 24AA01-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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