Microchip Technology AT24C01C-MAHM-E

Overview

AT24C01C-MAHM-E 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), 100/400 kHz I²C interface, and hardware write-protection via WP pin - used for configuration storage in embedded microcontroller systems.

For engineers reviewing the AT24C01C-MAHM-E datasheet, AT24C01C-MAHM-E pinout, AT24C01C-MAHM-E application, or AT24C01C-MAHM-E equivalent, key selection criteria include low-voltage operation, page-write capability, endurance (1M cycles), data retention (100 years), and compatibility with multi-device I²C bus topologies using A0–A2 address inputs.

Technical Context

The AT24C01C-MAHM-E functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable hardware address bits (A0–A2), enabling up to eight devices on one bus. It implements Schmitt-triggered, noise-filtered SDA/SCL inputs and supports standard/fast/Fast Mode Plus timing modes depending on VCC level.

Internally, it uses a high-voltage generation circuit for EEPROM programming, a hardware address comparator for slave selection, and a power-on reset (POR) circuit requiring ≥100 µs stable VCC before command acceptance. Write operations are self-timed with ≤5 ms maximum cycle time and support both byte and 8-byte page writes.

Key Specifications

Pinout & Package

AT24C01C-MAHM-E is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01C-MAHM-E, M24C01-RMN6TP sacrifices hardware write protection for broader distributor availability, while CAT24C01HU4I-GT3 offers identical UDFN-8 mechanical compatibility but trades endurance and high-speed I²C capability for lower unit cost.

Availability

AT24C01C-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, smart home controllers, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT24C01C-MAHM-E 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 memory products, with ISO 9001-certified manufacturing and global distribution.

The AT24C01C-MAHM-E belongs to Microchip's legacy serial EEPROM family designed for reliable, low-power nonvolatile storage in resource-constrained embedded systems where I²C bus simplicity and voltage flexibility are prioritized.

FAQ

What is the maximum I²C clock frequency supported by AT24C01C-MAHM-E?

The AT24C01C-MAHM-E supports 400 kHz Fast Mode across its full 1.7V–5.5V VCC range. At VCC ≥ 2.5V, it also supports 1 MHz Fast Mode Plus. Standard Mode (100 kHz) is guaranteed from 1.7V. These speeds are defined in the AC Characteristics table of the DS20006111A datasheet and validated per JEDEC JESD78.

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

Yes, AT24C01C-MAHM-E requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is input-only. Recommended values are ≤10 kΩ for SDA; SCL pull-up value depends on bus capacitance and speed - typical values range from 4 kΩ (400 kHz) to 10 kΩ (100 kHz), as specified in Table 4-3 of the datasheet.

How does the WP pin function on AT24C01C-MAHM-E?

The WP (Write-Protect) pin on AT24C01C-MAHM-E is an active-high hardware lock. When tied to VCC, it disables all write operations to the entire memory array. When tied to GND, normal read/write access is enabled. If left floating, it defaults to GND via internal pull-down, but Microchip recommends hardwiring for noise immunity.

What is the memory organization of AT24C01C-MAHM-E?

AT24C01C-MAHM-E is organized as 128 words × 8 bits (1,024 total bits), divided into 16 pages of 8 bytes each. This structure enables efficient 8-byte page writes and supports both random and sequential read modes. Addressing uses a 7-bit word address following the 7-bit device address, as detailed in Section 6 of DS20006111A.

Is AT24C01C-MAHM-E compatible with other AT24Cxx devices on the same I²C bus?

Yes, AT24C01C-MAHM-E is electrically and protocol-compatible with other AT24Cxx EEPROMs (e.g., AT24C02C, AT24C04C) on the same I²C bus. Its device address prefix is 1010b, and A0–A2 pins allow unique addressing of up to eight devices. However, memory size and page boundaries differ - software must manage address ranges per device.