Microchip Technology AT24C512C-SSHD-B

Overview

AT24C512C-SSHD-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 sensor nodes.

For engineers reviewing the AT24C512C-SSHD-B datasheet, AT24C512C-SSHD-B pinout, AT24C512C-SSHD-B application, or AT24C512C-SSHD-B 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-8.

Technical Context

The AT24C512C-SSHD-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 integrates a Power-on Reset (POR) circuit with 100 µs tPUP delay.

Memory is partitioned into 512 pages of 128 bytes each, enabling partial-page writes. Device addressing uses three hardware pins (A0–A2) to support up to eight devices on one bus, with address decoding performed by an internal hardware comparator and address register/counter logic.

Key Specifications

Pinout & Package

AT24C512C-SSHD-B is supplied in an 8-lead SOIC package (SOIC-8, 150 mil width), with gull-wing leads and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot; device orientation follows industry-standard top-view labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512BN-SH-B, AT24C512C-SSHD-B adds low-voltage operation down to 1.7V and guarantees FM+ timing - critical for high-throughput boot-time configuration loading. Versus M24512-RMN6TP, AT24C512C-SSHD-B provides superior noise immunity and faster write cycles, making it preferred for electrically harsh industrial deployments.

Availability

AT24C512C-SSHD-B is available at Aetrix Electronics and suitable for industrial PLCs, medical sensor calibration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for AT24C512C-SSHD-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 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-SSHD-B belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems where write endurance and long-term data integrity are critical.

FAQ

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

The AT24C512C-SSHD-B supports two voltage grades: 1.7V–3.6V and 2.5V–5.5V. At 1.7V–2.5V, it operates up to 400 kHz Fast mode; at 2.5V–5.5V, it supports 1 MHz Fast Mode Plus. This dual-grade design allows seamless integration into both ultra-low-power and legacy 3.3V/5V systems without sacrificing communication bandwidth. The AT24C512C-SSHD-B automatically adapts timing based on applied VCC.

How does the write-protect (WP) pin function on the AT24C512C-SSHD-B?

When the WP pin on the AT24C512C-SSHD-B is driven high (VCC), all write operations to the entire memory array are disabled - preventing accidental overwrites during power transients or software faults. When WP is low (GND), normal read/write access is enabled. If left floating, WP is internally pulled down, but Microchip recommends hardwiring it to avoid noise-induced false protection. The AT24C512C-SSHD-B implements this as a hardware-level gate, independent of I²C commands.

What is the memory organization of the AT24C512C-SSHD-B, and how does it impact page writes?

The AT24C512C-SSHD-B organizes its 512 Kbit memory into 512 pages of 128 bytes each. This structure enables efficient 128-byte page writes, where partial writes (e.g., 1–127 bytes) are allowed without erasing adjacent data. Each page write completes in ≤5 ms, and the AT24C512C-SSHD-B handles internal address incrementing automatically - simplifying firmware implementation for sequential data logging or configuration saves.

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

Yes, the AT24C512C-SSHD-B requires external pull-up resistors on both SDA and SCL because these pins are open-drain. For 100 kHz operation, ≤10 kΩ is acceptable; for 400 kHz, ≤4 kΩ is recommended; for 1 MHz Fast Mode Plus, ≤1.3 kΩ is required. Resistor value must also account for bus capacitance (CL ≤100 pF per Microchip's AC specs). The AT24C512C-SSHD-B's Schmitt-trigger inputs improve noise margin but do not eliminate the need for proper pull-ups.

How does the AT24C512C-SSHD-B handle power-up sequencing to prevent spurious writes?

The AT24C512C-SSHD-B incorporates an internal Power-on Reset (POR) circuit that holds the device in reset until VCC crosses a 1.5 V threshold and remains stable for ≥100 µs (tPUP). During this period, the AT24C512C-SSHD-B ignores all I²C traffic - eliminating risk of misinterpreted start conditions or unintended writes during voltage ramp-up. System designers must ensure MCU firmware waits ≥100 µs after VCC stabilization before issuing the first I²C command to the AT24C512C-SSHD-B.