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Microchip Technology 24AA01/SN
- Part No.:
- 24AA01/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24AA01/SN.pdf
- Description:
- IC EEPROM 1KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,389
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Product details
Overview
24AA01/SN from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, low-voltage operation down to 1.7 V, 400 kHz max clock frequency (100 kHz below 2.5 V), and industrial temperature range (–40°C to +85°C). It supports 8-byte page writes and delivers ≤1 µA standby current for battery-backed systems such as smart meters and IoT sensor nodes.
For engineers reviewing the 24AA01/SN datasheet, 24AA01/SN pinout, 24AA01/SN application, or 24AA01/SN equivalent, this page provides verified electrical specs, package mapping to SOIC-8 (SN), I²C timing constraints, WP pin behavior, and validated alternatives for design-in and BOM optimization.
Technical Context
The 24AA01/SN implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal address pointer enables current-address, random, and sequential read modes without external addressing logic.
Write operations use an 8-byte page buffer with self-timed erase/write cycles (≤5 ms), while hardware write-protection via the WP pin disables all write commands when tied to VCC - no software lock required. Acknowledge polling allows host firmware to detect write completion without fixed delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fits calibration data, device ID, or configuration flags in space-constrained designs. |
| VCC Range | 1.7 V to 5.5 V - supports direct connection to Li-ion batteries (3.0–3.7 V) or 1.8/3.3/5.0 V system rails without level shifters. |
| Max Clock Frequency | 400 kHz at VCC ≥ 2.5 V; 100 kHz at 1.7 V ≤ VCC < 2.5 V - ensures reliable I²C timing across wide supply range. |
| Page Write Buffer | 8 bytes - reduces I²C transaction count for multi-byte updates, improving bus efficiency and reducing host CPU overhead. |
| Write Cycle Time | ≤5 ms - enables deterministic firmware wait loops or ACK polling instead of fixed 10 ms delays. |
| Endurance | 1,000,000 write cycles - supports frequent logging or parameter tuning in industrial controllers and medical devices. |
| Data Retention | >200 years - guarantees long-term storage of critical calibration or security keys without refresh. |
Pinout & Package
24AA01/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 1.27 mm pitch, JEDEC MS-012AC standard footprint, and matte tin (Sn) lead finish. Pin 1 is marked by a beveled corner or notch on the package top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address Input (NC) | No internal connection; may be left floating or tied to VSS/VCC - no effect on device addressing. |
| A1 | Address Input (NC) | No internal connection; no impact on I²C client address (fixed as 1010xxx0/1). |
| A2 | Address Input (NC) | No internal connection; eliminates need for external pull-up/down resistors on A0–A2 lines. |
| VSS | Ground Reference | System return path for all internal circuitry; must be connected to PCB ground plane with low-impedance trace. |
| SDA | Serial Data I/O | Open-drain bidirectional line requiring external pull-up (2 kΩ typical for 400 kHz); carries address, data, and ACK bits. |
| SCL | Serial Clock Input | Input-only clock line synchronized to host controller; Schmitt trigger ensures noise immunity on rising/falling edges. |
| WP | Write-Protect Control | Logic-high (VCC) disables all write operations; logic-low (VSS) enables full read/write access - hardware-level security. |
| VCC | Power Supply | Single 1.7–5.5 V supply powers EEPROM core and I/O buffers; decoupling capacitor (0.1 µF) required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | Functional down to 1.7 V enables direct integration into energy-harvesting and coin-cell-powered systems. |
| I²C Compatibility | Fully compliant with Philips I²C-bus specification, including Start/Stop detection, ACK/NACK, and 7-bit addressing. |
| Hardware Write-Protection | WP pin physically blocks write commands without firmware intervention - prevents accidental or malicious corruption. |
| Schmitt Trigger Inputs | 50 mV hysteresis on SDA/SCL rejects noise spikes up to 50 ns, eliminating external filtering components. |
| Page Write Buffer | 8-byte buffer reduces I²C bus occupancy by up to 87% vs. byte-wise writes, accelerating firmware configuration routines. |
Applications
| Smart Energy Meters | Industrial PLC Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration coefficients, and tamper-event logs in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed 200-year data retention and 1M endurance for field-deployed units. Use Value: Eliminates need for battery-backed SRAM; WP pin prevents unauthorized firmware or tariff updates during field servicing. | Use Scenario: Holding I/O mapping definitions, PID loop parameters, and firmware update staging data in programmable logic controllers. IC Role / Device Role / Timing Role: I²C-configurable persistent memory accessible by ARM Cortex-M host MCU during boot and runtime. Use Value: Enables zero-downtime parameter reconfiguration via Modbus over I²C; 1.7 V operation supports brown-out resilience. |
| Medical Sensor Pods | Automotive Body Controllers |
Use Scenario: Recording sensor calibration offsets, patient-specific thresholds, and usage history in portable ECG or SpO₂ monitors. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to ultra-low-power microcontroller (e.g., MSP430) via I²C at 100 kHz. Use Value: ≤1 µA standby current extends single-CR2032 battery life beyond 5 years; RoHS and AEC-Q100 qualification ensure regulatory compliance. | Use Scenario: Storing seat position presets, mirror angle profiles, and lighting configuration in door modules and junction boxes. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory accessed by local microcontroller over robust I²C bus with noise suppression. Use Value: AEC-Q100 qualification ensures reliability under thermal cycling (-40°C to +85°C); WP pin locks factory settings against dealership reprogramming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 24LC01B/SN | Requires minimum 2.5 V VCC; same 400 kHz speed and 8-byte page buffer but no 1.7 V support. | Not suitable for sub-2.5 V battery systems; otherwise identical pinout and I²C protocol. | Select only if system rail is ≥2.5 V and cost sensitivity outweighs low-voltage flexibility. |
| AT24C01C-SSHM-T | 1.7–5.5 V operation and 400 kHz speed, but uses different write-protection scheme (software-configurable WP bit). | Lacks hardware WP pin - requires firmware coordination to prevent writes; not drop-in for safety-critical WP use cases. | Choose when software-controlled protection suffices and Microchip second-sourcing is not required. |
Compared with 24LC01B/SN, 24AA01/SN adds true 1.7 V operation for ultra-low-power systems; compared with AT24C01C-SSHM-T, it provides hardware-enforced write protection independent of host firmware state - critical for fail-safe automotive and medical applications.
Availability
24AA01/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC modules, medical sensor pods, and automotive body controllers requiring stable component supply across extended product lifecycles.
Supply support for 24AA01/SN 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products for industrial, automotive, and consumer markets.
The 24AA01 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power I²C-based configuration and calibration storage in space-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the 24AA01/SN?
The 24AA01/SN supports up to 400 kHz when VCC is 2.5 V or higher. At supply voltages between 1.7 V and 2.5 V, the maximum clock frequency is reduced to 100 kHz to maintain timing margin. This dual-speed capability ensures reliable operation across wide input voltage ranges without external clock dividers or firmware adaptation.
Does the 24AA01/SN require external pull-up resistors on the SDA and SCL lines?
Yes, the 24AA01/SN requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. For 400 kHz operation, a 2 kΩ resistor to VCC is recommended; for 100 kHz, 10 kΩ is typical. These values ensure proper rise times per I²C specification while minimizing power consumption during bus idle states.
How does the WP pin function on the 24AA01/SN?
On the 24AA01/SN, the WP (Write-Protect) pin is a hardware-level control: when tied to VCC, all write operations (byte and page) are inhibited while reads remain fully functional; when tied to VSS, full read/write access is enabled. This pin provides unconditional protection independent of firmware state or I²C command sequence.
Can the 24AA01/SN be used in automotive applications?
Yes - the 24AA01/SN is AEC-Q100 qualified for automotive applications and rated for the industrial temperature range (–40°C to +85°C). Its hardware write-protection, 1.7 V operation, and noise-suppressed I²C interface make it suitable for body control modules, seat memory systems, and lighting controllers where data integrity and supply resilience are critical.
What is the endurance and data retention specification for the 24AA01/SN?
The 24AA01/SN guarantees 1,000,000 erase/write cycles and data retention exceeding 200 years at +25°C. These specifications are validated per JEDEC standards and apply across the full industrial temperature range, ensuring long-term reliability in infrastructure and medical equipment where field replacement is impractical.
24AA01/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
24AA01/SN FAQ
1.How can I place an order for 24AA01/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24AA01/SN 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/SN reliable?
The price and inventory of 24AA01/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24AA01/SN is usually 5 days.
3.What payment methods are accepted for 24AA01/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24AA01/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24AA01/SN?
24AA01/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24AA01/SN 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/SN?
For technical support, including 24AA01/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24AA01/SN requirements.
6.How does Aetrix verify that 24AA01/SN is sourced from the original manufacturer or authorized distributors?
All 24AA01/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 24AA01/SN?
All 24AA01/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24AA01/SN, 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/SN part is unused and in its original packaging.
Return procedure for 24AA01/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24AA01/SN 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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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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