Microchip Technology AT24C512C-SHM-B

Overview

AT24C512C-SHM-B 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-SHM-B datasheet, AT24C512C-SHM-B pinout, AT24C512C-SHM-B application, or AT24C512C-SHM-B equivalent, key selection criteria include voltage-grade compatibility (1.7–3.6V vs. 2.5–5.5V), page-write latency (≤5 ms), endurance (1M cycles), data retention (100 years), and package-specific pin mapping for SOIC-8.

Technical Context

The AT24C512C-SHM-B 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 partitioned into 512 pages of 128 bytes each, enabling partial-page writes and sequential reads. The device enters Standby mode after Stop condition or power-up reset, drawing ≤6 μA; write operations are inhibited when WP = VCC, and all address pins default to GND if floating due to strong internal pull-downs.

Key Specifications

Pinout & Package

AT24C512C-SHM-B is supplied in an 8-lead SOIC package (SOIC-8, JEDEC MS-012), with gull-wing leads, 1.27 mm pitch, and standard 5.0 mm × 6.2 mm footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512BN-SH-B and M24512-RMN6TP, the AT24C512C-SHM-B uniquely combines 1.7V operation, 1 MHz Fast Mode Plus, and 100-year retention - making it optimal for next-generation ultra-low-power, safety-critical, and high-throughput embedded systems.

Availability

AT24C512C-SHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, embedded controller boot configuration, and medical device parameter storage requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C512C-SHM-B 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 Inc. is a leading provider of microcontrollers, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.

The AT24C512C-SHM-B belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, engineered for robust, low-power nonvolatile storage in space-constrained industrial, automotive, and medical applications where data integrity and long-term reliability are mandatory.

FAQ

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

The AT24C512C-SHM-B 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; at 2.5V–5.5V, it supports 1 MHz Fast Mode Plus. This dual-range design allows the same AT24C512C-SHM-B to serve both battery-powered sensors and mains-powered controllers without redesign. Voltage selection directly constrains achievable bus throughput - using AT24C512C-SHM-B below 2.5V forfeits 1 MHz capability.

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

The WP (Write-Protect) pin on the AT24C512C-SHM-B disables all write operations to the entire memory array when driven to VCC. If left floating, the pin is internally pulled down to GND, enabling normal writes - but Microchip strongly recommends tying WP to a known state (GND or VCC) due to capacitive coupling risks in noisy environments. Unintended writes during power transients can corrupt data; thus, proper WP routing is critical in safety-relevant designs using AT24C512C-SHM-B.

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

The AT24C512C-SHM-B organizes its 65,536 bytes into 512 pages of 128 bytes each. This structure enables 128-byte page writes with partial-write capability - meaning a single write command can program 1 to 128 contiguous bytes without affecting other locations in the page. This eliminates the need for read-modify-write sequences, reducing AT24C512C-SHM-B write time and MCU overhead compared to byte-wise writes, especially in firmware update or logging scenarios.

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

Yes, the AT24C512C-SHM-B requires external pull-up resistors on both SDA and SCL because these pins are open-drain. Recommended values depend on bus speed and capacitance: ≤10 kΩ for 100 kHz, ≤4 kΩ for 400 kHz, and ≤1.3 kΩ for 1 MHz Fast Mode Plus. Exceeding 10 kΩ may violate rise-time specs (tR ≤ 300 ns), causing communication failures - especially critical in noise-prone environments where the AT24C512C-SHM-B's Schmitt triggers rely on clean signal edges.

What is the guaranteed data retention and write endurance specification for the AT24C512C-SHM-B?

The AT24C512C-SHM-B guarantees 1,000,000 write cycles per memory location and 100 years of data retention at 55°C - validated through qualification testing and characterization. These figures apply across the full industrial temperature range (−40°C to +85°C) and both voltage grades. Unlike some EEPROMs with derated endurance above 85°C, the AT24C512C-SHM-B maintains full 1M-cycle spec throughout its operating range, making it suitable for mission-critical applications where long-term data integrity is non-negotiable.