Microchip Technology AT24C512C-SHD-B

Overview

AT24C512C-SHD-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 - deployed in embedded system configuration storage, sensor calibration data retention, and power-fail-safe parameter backup.

For engineers reviewing the AT24C512C-SHD-B datasheet, AT24C512C-SHD-B pinout, AT24C512C-SHD-B application, or AT24C512C-SHD-B equivalent, key selection criteria include voltage-grade compatibility (1.7–3.6V vs. 2.5–5.5V), page-write timing (≤5 ms), endurance (1M cycles), and package-specific pin mapping for SOIC-8 footprint integration.

Technical Context

The AT24C512C-SHD-B functions as an I²C slave device with bidirectional SDA and unidirectional SCL interface, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) clock rates depending on VCC level. Its internal address decoder accepts 3-bit hardware address inputs (A0–A2) enabling up to eight devices on one bus.

It implements Schmitt-triggered, noise-filtered inputs, open-drain SDA with external pull-up requirement, and hardware write protection via dedicated WP pin. Memory is partitioned into 512 pages of 128 bytes each, supporting partial-page writes and self-timed internal write cycles with automatic erase/write sequencing.

Key Specifications

Pinout & Package

AT24C512C-SHD-B is supplied in an 8-lead SOIC package (SOIC-8, 150 mil width), with pin 1 marked by notch or dot. Pin assignments are identical across SOIC, SOIJ, 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-SH-B and M24512-RMN6TP, the AT24C512C-SHD-B uniquely combines 1.7V minimum supply, 1 MHz FM+ interface, and 6 μA max standby current - making it optimal for next-generation ultra-low-power, high-reliability embedded systems where voltage headroom and write speed are design constraints.

Availability

AT24C512C-SHD-B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart energy meters, automotive body control modules, and medical infusion pumps requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C512C-SHD-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 leading provider of microcontrollers, analog components, and memory solutions, serving industrial, automotive, and communications markets with vertically integrated silicon and development tools.

The AT24C512C-SHD-B belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, engineered for robust nonvolatile data storage in space-constrained, low-power embedded systems with stringent reliability and longevity requirements.

FAQ

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

The AT24C512C-SHD-B supports two voltage grades: 1.7V–3.6V and 2.5V–5.5V. At 1.7V–2.49V, 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 system architects to select the optimal trade-off between ultra-low-power operation and high-speed parameter loading without changing the EEPROM part number.

How does the WP pin function on the AT24C512C-SHD-B, and what happens if it's left unconnected?

On the AT24C512C-SHD-B, the WP pin disables all write operations when tied to VCC and enables writes when tied to GND. If left floating, it is internally pulled down to GND - enabling writes by default. However, Microchip recommends hardwiring WP to a known state due to potential capacitive coupling in noisy environments that could inadvertently assert write protection.

What is the maximum write cycle time for the AT24C512C-SHD-B, and how does page write mode improve efficiency?

The AT24C512C-SHD-B has a maximum self-timed write cycle time of 5 ms per byte or page. In 128-byte page write mode, up to 128 bytes can be written in a single cycle - reducing average write latency by up to 128× compared to byte-write mode. This accelerates bulk configuration updates while maintaining EEPROM reliability and endurance.

Can multiple AT24C512C-SHD-B devices share the same I²C bus, and how is addressing managed?

Yes, up to eight AT24C512C-SHD-B devices can share one I²C bus using hardware address pins A0, A1, and A2. These pins configure the three LSBs of the 7-bit slave address (base 0x50), yielding addresses 0x50–0x57. Each device must have a unique A0–A2 combination; floating pins default to '0', so explicit routing is required for deterministic multi-device operation.

What is the endurance and data retention specification for the AT24C512C-SHD-B, and under what conditions are they guaranteed?

The AT24C512C-SHD-B guarantees 1,000,000 write cycles and 100 years of data retention at 55°C ambient temperature. These values are characterized per Microchip DS20006161B and apply to standard page-write operations at VCC = 3.3V and TA = 25°C. Retention degrades logarithmically with temperature - e.g., >200 years at 25°C - but 100 years at 55°C is the qualified minimum for industrial deployment.