Microchip Technology AT24C512BN-SH25-B

Overview

AT24C512BN-SH25-B from Microchip Technology (formerly Atmel) is a 512 Kbit serial EEPROM IC with I²C-compatible two-wire interface, organized as 65,536 × 8 bits, supporting 2.5V operation (2.5V to 5.5V), 1 MHz clock speed at 5.5V, and hardware write protection via WP pin. It is used for nonvolatile parameter storage in industrial controllers, medical device calibration registers, and embedded system configuration memory.

For engineers reviewing the AT24C512BN-SH25-B datasheet, AT24C512BN-SH25-B pinout, AT24C512BN-SH25-B application, or AT24C512BN-SH25-B equivalent, key selection criteria include voltage range compatibility (2.5V–5.5V), 128-byte page write capability, 1,000,000 write endurance, 40-year data retention, and JEDEC SOIC-8 package with NiPdAu lead finish.

Technical Context

The AT24C512BN-SH25-B implements a cascaded I²C slave architecture with three hardware address pins (A0–A2), enabling up to eight devices on a shared bus. Its internal timing logic supports self-timed 5 ms write cycles and noise-immune Schmitt-trigger inputs with filtered SCL/SDA paths.

It features dual-voltage design targeting 2.5V systems, with DC characteristics validated across –40°C to +85°C, including 6.0 µA max standby current at 5.5V and 0.4 V output low level at 3.0V/2.1 mA load - confirming robust interoperability with 3.3V microcontrollers and legacy 5V logic.

Key Specifications

Pinout & Package

AT24C512BN-SH25-B is packaged in an 8-lead JEDEC SOIC (package code 8S1), 0.150" wide body, with NiPdAu lead finish per ordering code specification. Pin 1 is marked by a beveled corner or dot; leads are gull-wing shaped, compliant with IPC-7351B standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512BN-SH25-B, the SH-T variant offers identical functionality in tape-and-reel packaging but targets 1.8V systems, while M24512-RDW6TP/K trades address flexibility and hardware WP for marginally lower standby current and simplified layout - making AT24C512BN-SH25-B optimal for multi-node industrial buses requiring robust 5V compatibility.

Availability

AT24C512BN-SH25-B is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart energy metering applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C512BN-SH25-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 acquired Atmel in 2016 and maintains full product continuity, qualification, and technical support for the AT24Cxx EEPROM family.

The AT24C512B series was designed for reliable, low-power nonvolatile data storage in industrial, medical, and communications equipment where extended data retention and high write endurance are critical.

FAQ

What voltage range does the AT24C512BN-SH25-B support?

The AT24C512BN-SH25-B supports a supply voltage range of 2.5V to 5.5V, as confirmed by its "–2.5" suffix and DC Characteristics Table 2-2. This allows direct interfacing with both 3.3V and 5V microcontrollers without level-shifting circuitry. Operation outside this range risks functional failure or reduced reliability, and absolute maximum rating is 6.25V.

Does the AT24C512BN-SH25-B support multi-device I²C bus configurations?

Yes, the AT24C512BN-SH25-B supports up to eight devices on a single I²C bus using hardware address pins A0, A1, and A2. Each pin can be tied to VCC or GND to configure a unique 3-bit device address, resulting in I²C addresses from 0x50 to 0x57. Floating address pins default to GND but must be externally biased per Atmel's reliability guidance.

How does the write protect (WP) pin function on the AT24C512BN-SH25-B?

On the AT24C512BN-SH25-B, the WP pin is active-high: when tied to VCC, all write operations (byte and page) are inhibited; when tied to GND, normal writes are enabled. The pin has an internal pull-down, but Atmel recommends external biasing (e.g., 10kΩ resistor to GND) to prevent capacitive coupling-induced glitches during noise events.

What is the maximum write speed and page size for the AT24C512BN-SH25-B?

The AT24C512BN-SH25-B supports a maximum I²C clock frequency of 1 MHz at 5.5V, enabling fast communication. Its page write size is fixed at 128 bytes, allowing up to 128 sequential bytes to be written in a single transaction. Each internal write cycle completes in ≤5 ms, independent of page fill level.

Is the AT24C512BN-SH25-B qualified for industrial temperature operation?

Yes, the AT24C512BN-SH25-B is specified for operation from –40°C to +85°C, as stated in the Absolute Maximum Ratings and DC Characteristics tables. This industrial temperature grade is verified across all electrical parameters, including standby current, input thresholds, and write timing, making it suitable for deployment in harsh environments such as factory floors or outdoor utility infrastructure.