Microchip Technology AT24C512C-MAHM-T

Overview

AT24C512C-MAHM-T 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-T datasheet, AT24C512C-MAHM-T pinout, AT24C512C-MAHM-T application, or AT24C512C-MAHM-T equivalent, key selection considerations 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 package-specific pin mapping for SOIC/TSSOP/UDFN variants.

Technical Context

The AT24C512C-MAHM-T 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 programming and features automatic address decoding across eight possible device addresses via A0–A2 pins.

Memory is organized into 512 pages of 128 bytes each, enabling partial-page writes and sequential/random reads. The device enters Standby mode after Stop condition or power-up reset, drawing ≤6 μA; active current remains ≤3 mA during write operations, with built-in Power-on Reset (POR) and software reset capability via SCL clocking.

Key Specifications

Pinout & Package

AT24C512C-MAHM-T is supplied in an 8-lead TSSOP package (Moisture Sensitivity Level 3, RoHS-compliant, halide-free). Pin functions are identical across SOIC, TSSOP, UDFN, VFBGA, and WLCSP variants per Microchip DS20006161B.

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-T uniquely supports dual-voltage operation (1.7–3.6V and 2.5–5.5V), 1 MHz Fast Mode Plus, and 100-year data retention validated at 55°C - making it the only option qualified for wide-input, high-reliability, thermally demanding embedded systems.

Availability

AT24C512C-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering systems, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.

Supply support for AT24C512C-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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The AT24C512C belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile storage in space-constrained industrial, automotive, and medical applications.

FAQ

What voltage ranges does the AT24C512C-MAHM-T support, and how do they affect system design?

The AT24C512C-MAHM-T supports two distinct voltage grades: 1.7V–3.6V (low-voltage) and 2.5V–5.5V (standard). This dual-grade capability allows direct interfacing with 1.8V or 3.3V microcontrollers without level shifters. System designers must select the appropriate grade based on host MCU I/O voltage - using the low-voltage grade enables battery-powered operation down to 1.7V, while the standard grade simplifies integration with 5V legacy systems. Both grades share identical timing and functional specifications.

How does the WP pin on the AT24C512C-MAHM-T function, and what happens if it's left unconnected?

The WP (Write-Protect) pin on the AT24C512C-MAHM-T disables all write operations when pulled high to VCC. When connected to GND, normal read/write access is enabled. If left floating, the pin is internally pulled down to GND - allowing writes - but Microchip strongly recommends hardwiring WP to a known state due to potential capacitive coupling noise. Unintended writes can occur in noisy environments if WP floats, so a 10 kΩ pull-down resistor is advised for fail-safe operation in the AT24C512C-MAHM-T.

What is the maximum write speed and page structure of the AT24C512C-MAHM-T?

The AT24C512C-MAHM-T supports up to 1 MHz Fast Mode Plus I²C clocking (at VCC ≥2.5V), enabling faster data transfer than standard 400 kHz devices. Its memory is organized into 512 pages of 128 bytes each. Page writes allow up to 128 bytes to be written in a single operation with a maximum self-timed write cycle of 5 ms. Partial-page writes are permitted, and the device supports both random and sequential read modes - making the AT24C512C-MAHM-T well-suited for burst logging and configuration updates.

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

Yes, the AT24C512C-MAHM-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Microchip specifies maximum values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation - with lower resistance enabling faster rise times but increasing power consumption. For most 3.3V designs targeting 400 kHz, a 4.7 kΩ resistor provides optimal noise immunity and speed balance. These values apply directly to the AT24C512C-MAHM-T regardless of package variant.

How is the I²C slave address determined for the AT24C512C-MAHM-T, and can multiple units share one bus?

The AT24C512C-MAHM-T uses a 7-bit I²C slave address where the upper 4 bits are fixed as '1010', and the lower 3 bits (A2, A1, A0) are set by hardwiring those pins to GND or VCC. This allows up to eight AT24C512C-MAHM-T devices to coexist on the same I²C bus with unique addresses. Each device responds only to its configured address, enabling scalable configuration storage across distributed subsystems - for example, separate EEPROMs for display, motor, and sensor modules in a single controller.