Renesas R1EX24512ASAS0A#S0

Overview

R1EX24512ASAS0A from Renesas Electronics is a 512-kbit (64-kword × 8-bit) two-wire serial EEPROM with I²C interface, 1.8 V to 5.5 V single-supply operation, 400 kHz/1 MHz clock support, and 128-byte page write capability. It delivers high reliability for nonvolatile data storage in embedded control systems requiring long-term data retention and low-power standby.

For engineers reviewing the R1EX24512ASAS0A datasheet, R1EX24512ASAS0A pinout, R1EX24512ASAS0A application, or R1EX24512ASAS0A equivalent, key selection considerations include its −40°C to +85°C industrial temperature range, WP-enabled hardware write protection, 5 ms write cycle time, and SOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a standard I²C-compatible two-wire bus protocol with fixed 4-bit device code "1010", programmable 2-bit device address (A0/A1), and R/W bit control. It uses CMOS process with MNOS memory technology to achieve 1,000k write cycles at 25°C and 100-year data retention.

The internal architecture includes an address generator, X/Y decoders, sense amplifiers, and serial-parallel converter, enabling byte and page write operations. Write protection is implemented via dedicated WP pin logic that disables all writes when pulled high, while SDA remains open-drain with external pull-up requirement.

Key Specifications

Pinout & Package

Package: 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), 3.9 mm × 4.89 mm body, 1.27 mm pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512-SSHL-T, R1EX24512ASAS0A offers broader voltage flexibility (1.8 V min) and Renesas' industrial qualification; versus BR24G512FJ-WE2, it trades slightly higher standby current for proven legacy design stability in automotive Tier-1 supply chains.

Availability

R1EX24512ASAS0A is available at Aetrix Electronics and suitable for smart meter calibration storage, automotive body control modules, and industrial PLC I/O expansion cards requiring stable component supply across extended product lifecycles.

Supply support for R1EX24512ASAS0A 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series was designed specifically for high-reliability consumer and industrial applications requiring long data retention, low-voltage operation, and robust I²C interoperability - notably cellular handsets, camcorders, and embedded controllers.

FAQ

What is the maximum I²C clock frequency supported by R1EX24512ASAS0A?

R1EX24512ASAS0A supports up to 1 MHz I²C clock frequency when operated at 2.5 V to 5.5 V supply, and 400 kHz at 1.8 V to 5.5 V. The clock rate is voltage-dependent to ensure signal integrity and timing margin across the full operating range. This dual-frequency capability allows designers to optimize speed in higher-voltage subsystems while maintaining noise immunity in 1.8 V domains. R1EX24512ASAS0A's AC timing parameters are fully specified for both conditions in its official datasheet.

Does R1EX24512ASAS0A support 1.8 V operation, and what are the implications?

Yes, R1EX24512ASAS0A is fully specified for 1.8 V operation, including 400 kHz I²C communication, 2 µA max standby current, and reliable 128-byte page writes. Operating at 1.8 V enables direct integration into modern ultra-low-power MCUs and SoCs without level-shifting circuitry. However, write current increases to 5 mA max at 1.8 V, requiring careful PCB layout to avoid local VCC droop. R1EX24512ASAS0A's DC and AC characteristics are validated across the entire 1.8–5.5 V range per REJ03C0325-0101 Rev.1.01.

How does the WP (Write Protect) pin function on R1EX24512ASAS0A?

The WP pin on R1EX24512ASAS0A is an active-high hardware write protection input. When WP is driven high (VIH ≥ 0.7 × VCC), all write operations - including byte and page writes - are disabled, and the device responds with a NO ACK after address reception. Read operations remain fully functional regardless of WP state. This feature provides fail-safe protection against firmware bugs or power glitches corrupting stored data. R1EX24512ASAS0A's WP logic is implemented entirely in hardware, requiring no initialization or register configuration.

What is the page write size and write cycle time for R1EX24512ASAS0A?

R1EX24512ASAS0A supports 128-byte page write operations, allowing up to 128 bytes to be programmed in a single internal write cycle. Its typical write cycle time is 5 ms, measured from the STOP condition to completion of internal programming. This enables efficient bulk data updates - for example, writing a full calibration table in one command instead of 128 separate byte writes. The 5 ms tWC is guaranteed across the full −40°C to +85°C temperature range and 1.8–5.5 V supply, as confirmed in the AC Characteristics table of the R1EX24512ASAS0A datasheet.

Is R1EX24512ASAS0A qualified for automotive applications?

R1EX24512ASAS0A is rated for −40°C to +85°C operation and meets industrial reliability standards, but Renesas explicitly states in its documentation that the R1EX24xxx series is authorized for consumer applications (e.g., cellular phones, camcorders) and requires sales office consultation before use in automotive systems. It is not AEC-Q100 qualified, and its quality grade is "Standard" per Renesas' classification - intended for office equipment, communications gear, and industrial robots, not safety-critical automotive ECUs. For automotive use, R1EX24512ASAS0A must undergo additional validation by the end customer.