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Microchip Technology AT24C01B-PU
- Part No.:
- AT24C01B-PU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT24C01B-PU.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
AT24C01B-PU from Microchip Technology is a 1K-bit (128 × 8) two-wire serial EEPROM with 1.8V to 5.5V operation, 400 kHz/1 MHz I²C interface speed, hardware write protection via WP pin, and 1 million write cycles endurance. It serves as nonvolatile configuration storage in microcontroller-based systems requiring low-power, industrial-temperature (–40°C to +85°C) data retention.
For engineers reviewing the AT24C01B-PU datasheet, AT24C01B-PU pinout, AT24C01B-PU application, or AT24C01B-PU equivalent, key selection criteria include VCC voltage range compatibility, I²C timing at 1.8V vs 5V, page-write capability (8-byte), WP pin logic behavior, and PDIP-8 package mechanical fit for through-hole prototyping and legacy board replacement.
Technical Context
The AT24C01B-PU implements a standard I²C-compatible two-wire interface with Schmitt-triggered SCL/SDA inputs and noise filtering, supporting multi-master arbitration and bidirectional data transfer. Its internal address counter auto-increments during sequential reads/writes across the 128-word memory array.
Write protection is controlled exclusively by the WP pin: when pulled high, all memory locations are write-protected; when low, normal write operations are enabled. The device uses an internal high-voltage pump for byte and page programming, completing self-timed writes in ≤5 ms without external timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1024 bits (128 × 8), enabling storage of small firmware parameters or calibration data without external memory controller |
| Interface | Two-wire I²C (SCL/SDA), compatible with standard microcontroller I²C peripherals and requiring only two GPIOs plus pull-ups |
| Operating Voltage | 1.8V to 5.5V, allowing direct integration into mixed-voltage systems (e.g., 3.3V MCU with 5V peripherals) |
| Write Speed | Page write: up to 8 bytes per cycle; self-timed ≤5 ms max, eliminating need for external write-complete polling delay |
| Endurance & Retention | 1 million write cycles and 100-year data retention at 25°C, suitable for field-updatable calibration tables |
| Temperature Range | –40°C to +85°C industrial grade, validated for deployment in automotive body control modules and industrial sensors |
| Input Filtering | Schmitt-trigger inputs with 50 ns noise suppression (tI), improving robustness against EMI in noisy motor-control environments |
Pinout & Package
AT24C01B-PU is supplied in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide, lead-free/halogen-free, with through-hole mounting and 0.100" pin pitch. Pin 1 is marked by a notch or dot at the top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware Address Inputs | Set device I²C slave address (bits A2–A0); grounded or tied to VCC to select one of eight possible addresses on shared bus |
| SDA | Serial Data I/O | Bidirectional open-drain line requiring external pull-up; carries address, command, and data during I²C transactions |
| SCL | Serial Clock Input | Master-generated clock signal; rising edge samples data, falling edge drives data; Schmitt-triggered for noise immunity |
| WP | Write Protect Input | Active-high pin: logic high disables all write operations (including page and byte writes), preventing accidental overwrites |
| GND | Ground Reference | System return path for VCC and all I/O signals; must be low-impedance connection to avoid I²C communication errors |
| VCC | Power Supply | Single supply input (1.8–5.5V); decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-Voltage Operation | Functional down to 1.8V VCC enables use with modern ultra-low-power MCUs and battery-backed systems |
| Hardware Write Protection | WP pin provides deterministic, pin-level lockout-no software overhead or register access needed to secure critical data |
| Partial Page Writes | Allows writing fewer than 8 bytes in a single page cycle, reducing wasted bandwidth and power in sparse update scenarios |
| Industrial Temperature Range | Rated –40°C to +85°C ensures reliable operation in uncontrolled environments like HVAC controllers and factory-floor sensors |
| Lead-Free/Halogen-Free | Complies with RoHS Directive 2011/65/EU and JEDEC JS709C, supporting environmentally compliant manufacturing |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Backup |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients and tariff tables that must survive power loss and field updates. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via I²C during boot or maintenance mode; no real-time timing role. Use Value: 100-year data retention and 1M write cycles support decades of field recalibration without EEPROM replacement. | Use Scenario: Holding user-defined I/O mapping, PID tuning values, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Persistent configuration register bank; accessed asynchronously during startup or HMI-initiated save operations. Use Value: WP pin allows hardware-enforced write lock during normal runtime, preventing corruption from firmware bugs or transient glitches. |
| Medical Device Settings Memory | Automotive Body Control Module |
Use Scenario: Saving user preferences (e.g., display brightness, alarm volume) and safety-critical defaults in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power configuration EEPROM interfaced to ARM Cortex-M0+ MCU; active only during setup or power-on reset. Use Value: 1.8V operation enables direct connection to 1.8V I/O domains, eliminating level shifters and reducing BOM count. | Use Scenario: Storing door lock actuator profiles, mirror position presets, and lighting dimming curves in vehicle interior modules. IC Role / Device Role / Timing Role: Robust nonvolatile memory co-located with 8-bit MCU; withstands automotive load dump and cold-crank conditions. Use Value: PDIP-8 package allows manual rework and socket-based validation in pre-production test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C01-RMN6TP | Same 1K-bit size, I²C interface, and PDIP-8 package; but rated only to +70°C ambient and lacks 1.8V min VCC support (2.5V–5.5V only) | Not suitable for industrial temperature deployments; requires VCC ≥2.5V, limiting use with 1.8V/2.0V MCUs | Select only if operating environment stays ≤70°C and system VCC ≥2.5V; verify WP pin polarity matches AT24C01B-PU (active-high) |
| ON Semiconductor CAT24C01WI-GT3 | Identical 1K-bit organization and 1.8V–5.5V range; uses same PDIP-8 footprint but specifies 400 kHz max speed at 1.8V (AT24C01B-PU supports 400 kHz at 1.8V and 1 MHz at 5V) | Limited to 400 kHz across full voltage range; no 1 MHz mode at 5V, reducing throughput in high-speed host systems | Acceptable for cost-sensitive designs where 1 MHz I²C is unnecessary; confirm tWR (5 ms) and WP behavior match legacy firmware expectations |
Compared with M24C01-RMN6TP and CAT24C01WI-GT3, the AT24C01B-PU uniquely combines industrial temperature rating, 1.8V operation, and dual-speed I²C (400 kHz/1 MHz), making it the only choice for ruggedized, low-voltage, high-throughput embedded systems requiring guaranteed long-term reliability.
Availability
AT24C01B-PU is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for AT24C01B-PU 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for embedded control applications.
The AT24C01B-PU belongs to Microchip's AT24Cxx family of I²C-compatible serial EEPROMs, designed specifically for space-constrained, low-power systems needing reliable, pin-efficient nonvolatile storage with minimal firmware overhead.
FAQ
What is the maximum I²C clock frequency supported by the AT24C01B-PU?
The AT24C01B-PU supports up to 1 MHz I²C clock frequency at VCC = 5.0V, and 400 kHz at VCC = 1.8V, 2.5V, or 2.7V. This dual-speed capability allows optimal throughput in both legacy 5V systems and modern low-voltage designs. Timing parameters such as tLOW and tHIGH are specified separately for each voltage condition in the official datasheet.
Does the AT24C01B-PU require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C01B-PU requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The AT24C01B-PU datasheet specifies maximum input capacitance (CI/O = 8 pF, CIN = 6 pF), which helps determine appropriate resistor values for reliable 400 kHz or 1 MHz operation.
How does the WP pin function on the AT24C01B-PU?
The WP (Write Protect) pin on the AT24C01B-PU is an active-high input that disables all write operations-including byte, page, and write-enable commands-when driven high (≥0.7×VCC). When WP is low or floating (with internal pull-down), normal write functionality is enabled. This hardware-level protection prevents accidental overwrites without requiring firmware intervention, making it ideal for safeguarding calibration data in deployed systems.
What package type is used for the AT24C01B-PU?
The AT24C01B-PU is supplied exclusively in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide, with through-hole leads and lead-free/halogen-free finish. This package is designated as "8P3" in Microchip's ordering matrix and is intended for prototyping, manual assembly, and legacy board replacements where surface-mount alternatives are unsuitable.
Is the AT24C01B-PU compatible with standard I²C protocol implementations?
Yes, the AT24C01B-PU fully complies with the standard Philips I²C-bus specification, supporting START/STOP conditions, 7-bit slave addressing (with A0–A2 pins selecting LSBs), ACK/NACK handshaking, and bidirectional data transfer. It also includes Schmitt-triggered inputs and noise filtering (tI = 50 ns), ensuring interoperability with common microcontroller I²C peripherals such as those found in STM32, PIC, and ESP32 families without additional signal conditioning.
AT24C01B-PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 550 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT24C01B-PU FAQ
1.How can I place an order for AT24C01B-PU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C01B-PU 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 AT24C01B-PU reliable?
The price and inventory of AT24C01B-PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C01B-PU is usually 5 days.
3.What payment methods are accepted for AT24C01B-PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C01B-PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C01B-PU?
AT24C01B-PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C01B-PU 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 AT24C01B-PU?
For technical support, including AT24C01B-PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C01B-PU requirements.
6.How does Aetrix verify that AT24C01B-PU is sourced from the original manufacturer or authorized distributors?
All AT24C01B-PU 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 AT24C01B-PU meets industry standards.
7.What is the process for return or replacement of AT24C01B-PU?
All AT24C01B-PU units undergo pre-shipment inspection (PSI). If there is an issue with AT24C01B-PU, 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 AT24C01B-PU part is unused and in its original packaging.
Return procedure for AT24C01B-PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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