Microchip Technology AT24C01C-MAHM-T

Overview

AT24C01C-MAHM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), supporting 100 kHz/400 kHz/1 MHz I²C modes and featuring hardware write-protection via WP pin - used for configuration storage in embedded controllers, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the AT24C01C-MAHM-T datasheet, AT24C01C-MAHM-T pinout, AT24C01C-MAHM-T application, or AT24C01C-MAHM-T equivalent, key selection criteria include guaranteed 1.7V operation, 8-byte page write capability, 1,000,000 write endurance, 100-year data retention, and compatibility with multi-device I²C bus topologies using A0–A2 address inputs.

Technical Context

The AT24C01C-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and an open-drain bidirectional SDA line requiring external pull-up. It uses internal high-voltage generation for EEPROM programming and features automatic power-on reset (POR) with 100 µs tPUP delay before command acceptance.

Memory is organized into 16 pages of 8 bytes each, supporting byte-write, page-write (with partial-page capability), current-address read, random read, and sequential read. Write protection is controlled by the WP pin: tied to VCC disables all writes; tied to GND enables full-array writes.

Key Specifications

Pinout & Package

AT24C01C-MAHM-T is supplied in an 8-lead UDFN package (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with AT24C01D-MAHM-T, the AT24C01C-MAHM-T offers proven field reliability but lacks the latest ESD enhancements; versus M24C01-RMN6TP, it trades 1.8V Fast Mode Plus support for broader voltage flexibility and Microchip's long-term supply assurance.

Availability

AT24C01C-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter calibration storage, and medical wearable boot configuration requiring stable component supply across extended product lifecycles.

Supply support for AT24C01C-MAHM-T 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 leading provider of microcontrollers, analog, FPGA, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The AT24C01C belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, space-constrained embedded systems requiring robust nonvolatile storage with minimal external components.

FAQ

What is the maximum I²C clock frequency supported by AT24C01C-MAHM-T at 1.8V?

At 1.8V, the AT24C01C-MAHM-T supports up to 400 kHz (Fast mode) - its 1 MHz Fast Mode Plus capability requires VCC ≥ 2.5V per DS20006111A, Section 4.4. This ensures interoperability with 1.8V microcontrollers while maintaining timing margin in marginal conditions. The AT24C01C-MAHM-T does not support 1 MHz operation below 2.5V.

Does AT24C01C-MAHM-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C01C-MAHM-T requires external pull-up resistors on both SDA and SCL. Its SDA pin is open-drain and SCL is input-only; Microchip specifies ≤10 kΩ for SDA (DS20006111A, Section 2.3). Typical values are 4.7 kΩ for 400 kHz or 2.2 kΩ for 1 MHz (≥2.5V). Pull-ups must connect to the same VCC domain as the AT24C01C-MAHM-T.

How many AT24C01C-MAHM-T devices can share the same I²C bus?

Up to eight AT24C01C-MAHM-T devices can share one I²C bus using the A0, A1, and A2 address pins to generate unique 3-bit hardware addresses (1010xxxR/W). All three pins must be hard-wired to GND or VCC - floating is discouraged due to capacitive coupling risks. The AT24C01C-MAHM-T's fixed 1010 device ID enables deterministic multi-slave arbitration.

What happens to AT24C01C-MAHM-T during a brown-out condition below 1.7V?

Below 1.7V, AT24C01C-MAHM-T enters undefined behavior: writes may corrupt data, reads may return invalid values, and the internal POR circuit holds the device in reset. DS20006111A specifies that VCC must monotonically rise above 1.7V with ≤0.1 V/µs slew rate. If VCC drops below VPOR (1.5V), a full power cycle with ≥500 ms VCC = 0V hold is required before reliable operation resumes.

Is the WP pin on AT24C01C-MAHM-T active-high or active-low?

The WP pin on AT24C01C-MAHM-T is active-high: when driven to VCC, it inhibits all write operations to the entire memory array; when driven to GND, writes are enabled. If left floating, the internal strong pull-down defaults WP to GND (enabling writes), but Microchip explicitly recommends hard-wiring WP to a known state to prevent noise-induced glitches.