Microchip Technology AT24C512C-MAHM-E

Overview

AT24C512C-MAHM-E from Microchip Technology is a 512-Kbit I²C-compatible serial EEPROM organized as 65,536 × 8 bits, operating from 1.7V to 3.6V or 2.5V to 5.5V, with industrial temperature range (–40°C to +85°C), 1 MHz Fast Mode Plus support, and hardware write protection via WP pin - used for nonvolatile configuration storage in embedded controllers and power management systems.

For engineers reviewing the AT24C512C-MAHM-E datasheet, AT24C512C-MAHM-E pinout, AT24C512C-MAHM-E application, or AT24C512C-MAHM-E equivalent, key selection factors include voltage-grade compatibility (1.7–3.6V vs. 2.5–5.5V), page-write timing (≤5 ms), endurance (1M cycles), data retention (100 years), and 8-pin SOIC package pin mapping with A0/A1/A2 address inputs.

Technical Context

The AT24C512C-MAHM-E implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) clock rates depending on VCC level. It uses an internal high-voltage generation circuit for EEPROM cell programming and features automatic address decoding across eight possible device addresses via A0–A2 pins.

Memory is partitioned into 512 pages of 128 bytes each, enabling partial-page writes and sequential/random reads. Write protection is implemented via dedicated WP pin tied to VCC (full-array lock) or GND (unlocked), with internal pull-downs ensuring defined state when pins float - critical for robustness in noisy industrial bus environments.

Key Specifications

Pinout & Package

AT24C512C-MAHM-E is supplied in an 8-lead SOIC package (MAHM suffix), with pin 1 = A0, pin 2 = A1, pin 3 = A2, pin 4 = GND, pin 5 = SDA, pin 6 = SCL, pin 7 = WP, pin 8 = VCC. All address and control pins feature internal pull-downs for fail-safe default addressing and write-enable behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512BN-MAHM-T and M24512-RMN6TP, the AT24C512C-MAHM-E uniquely supports 1.7V operation and 1 MHz Fast Mode Plus - making it the only option for ultra-low-power, high-bandwidth I²C configuration storage in next-generation edge devices.

Availability

AT24C512C-MAHM-E is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed green packaging compliance.

Supply support for AT24C512C-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 solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24C512C-MAHM-E belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for robust, low-power nonvolatile data storage in industrial, medical, and automotive applications demanding high reliability and extended temperature operation.

FAQ

What voltage ranges does the AT24C512C-MAHM-E support, and how do they affect I²C speed?

The AT24C512C-MAHM-E supports two voltage grades: 1.7V–3.6V (low-voltage) and 2.5V–5.5V (standard). At 1.7V–2.5V, maximum I²C speed is 400 kHz; above 2.5V, it supports 1 MHz Fast Mode Plus. This dual-range design allows the same AT24C512C-MAHM-E part to serve both battery-powered and line-powered systems without redesign. The voltage grade is determined by actual VCC applied - no configuration required.

How does the WP pin function on the AT24C512C-MAHM-E, and what happens if left unconnected?

The WP pin on the AT24C512C-MAHM-E enables hardware write protection: tied to VCC, it locks the entire memory array against writes; tied to GND, writes are permitted. If left floating, the pin is internally pulled down to GND, allowing writes - but Microchip strongly recommends explicit connection due to capacitive coupling risks in noisy environments. This behavior ensures safe default operation while mandating deliberate design intent for protection.

What is the memory organization of the AT24C512C-MAHM-E, and how does it impact write efficiency?

The AT24C512C-MAHM-E organizes its 512 Kbit as 512 pages × 128 bytes. This structure enables 128-byte page writes - allowing partial writes within a page without erasing adjacent data. Combined with ≤5 ms self-timed write cycles, this architecture minimizes host MCU blocking time and extends endurance by distributing writes across pages. The AT24C512C-MAHM-E thus achieves optimal balance between speed, flexibility, and longevity for firmware parameter updates.

Does the AT24C512C-MAHM-E require external pull-up resistors on SDA and SCL, and what values are recommended?

Yes - the AT24C512C-MAHM-E has open-drain SDA and input-only SCL, both requiring external pull-up resistors to VCC. Recommended values are ≤10 kΩ for SDA (to meet I²C rise-time specs), with specific guidance: 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation. SCL may also require pull-up if not actively driven by the master. These values ensure compliance with tR/tF and bus capacitance limits per I²C specification.

How is the device address configured on the AT24C512C-MAHM-E, and what is the default address when A0–A2 are unconnected?

The AT24C512C-MAHM-E uses A0, A1, and A2 pins to set the 3 LSBs of its 7-bit I²C address (base 0x50). When all three pins float, internal pull-downs force them low, resulting in device address 0x50. Each pin tied high adds 1 to the address (e.g., A0=high → 0x51). This allows up to eight AT24C512C-MAHM-E devices on one bus. Addressing is purely hardware-based - no software configuration is needed or supported.