Renesas R1EX24002ASAS0A#S0

Overview

R1EX24002ASAS0A from Renesas Electronics is a 2 kbit (256 × 8-bit) two-wire serial interface EEPROM with I²C-compatible bus interface, 1.8 V to 5.5 V single-supply operation, and 400 kHz clock frequency. It features 16-byte page write capability, 5 ms write cycle time, and operates across −40°C to +85°C for use in consumer electronics configuration storage.

For engineers reviewing the R1EX24002ASAS0A datasheet, R1EX24002ASAS0A pinout, R1EX24002ASAS0A application, or R1EX24002ASAS0A equivalent, key selection considerations include its SOP-8 package, WP-enabled hardware write protection, 100-year data retention at 25°C, and compatibility with standard I²C timing requirements including tSU.STA ≥ 600 ns and tHD.STA ≥ 600 ns.

Technical Context

This device implements a standard I²C protocol-compliant two-wire interface with open-drain SDA and active-high SCL, supporting byte and page write modes. Its internal address generator and memory array are controlled via serial command sequences including start/stop conditions, device addressing (1010 A2 A1 A0 R/W), and acknowledge polling during write cycles.

The R1EX24002ASAS0A uses MNOS memory technology on a CMOS process to achieve high reliability, with built-in power-on reset and noise suppression (50 ns) to prevent spurious writes during VCC transitions. Write protection is implemented via dedicated WP pin logic that disables all write operations when driven high.

Key Specifications

Pinout & Package

Package: 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), 3.9 mm × 4.89 mm body, 1.27 mm lead pitch, Ni/Pd/Au plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and M24C02-RMN6TP, the R1EX24002ASAS0A offers balanced performance for cost-sensitive consumer and industrial applications, with verified 100-year retention and integrated noise suppression-making it optimal where long-term data integrity and robustness against board-level transients are prioritized over extreme temperature or automotive qualification.

Availability

R1EX24002ASAS0A is available at Aetrix Electronics and suitable for consumer audio device calibration, industrial sensor node configuration, smart home controller settings, and medical diagnostic instrument setup requiring stable component supply and long-term data retention.

Supply support for R1EX24002ASAS0A 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and memory solutions.

The R1EX24xxx series was designed specifically for reliable, low-power, I²C-based nonvolatile storage in space-constrained consumer and industrial electronics where long data retention and immunity to power-rail noise are essential.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24002ASAS0A?

The R1EX24002ASAS0A supports a maximum I²C clock frequency of 400 kHz, compliant with Fast-mode I²C specifications. This allows reliable communication with most microcontrollers without requiring high-speed mode circuitry or special timing constraints beyond standard tSU.STA (≥600 ns) and tHD.STA (≥600 ns) requirements. The R1EX24002ASAS0A maintains full functionality across its entire 1.8 V to 5.5 V supply range at this rate.

Does the R1EX24002ASAS0A require external pull-up resistors on the SDA and SCL lines?

Yes, the R1EX24002ASAS0A requires external pull-up resistors on both SDA and SCL lines because its SDA pin uses an open-drain driver structure and SCL is a passive input. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed; Renesas recommends verifying VOL ≤ 0.4 V at IOL = 3.0 mA (for VCC ≥ 2.7 V) when selecting resistor values. The R1EX24002ASAS0A does not integrate internal pull-ups.

How does the write protection (WP) pin function on the R1EX24002ASAS0A?

When the WP pin of the R1EX24002ASAS0A is driven high (VIH ≥ VCC × 0.7), all write operations-including byte and page writes-are disabled, and the device returns a NO ACK ('1') after receiving write data. When WP is low (VIL ≤ VCC × 0.3), full read/write access is enabled. WP status has no effect on read operations, which remain fully functional regardless of WP state. This hardware-level protection is active independently of I²C commands.

What is the guaranteed data retention period for the R1EX24002ASAS0A at 85°C?

The R1EX24002ASAS0A guarantees 10 years of data retention at +85°C, as specified in its memory cell characteristics table. At +25°C, retention is rated for 100 years minimum. These values are measured under standard operating conditions (VCC = 1.8–5.5 V) and reflect end-of-life data integrity-not accelerated test projections. The R1EX24002ASAS0A achieves this using MNOS floating-gate technology optimized for long-term charge retention.

Can the R1EX24002ASAS0A be used in automotive applications?

The R1EX24002ASAS0A is not qualified for automotive applications per Renesas' own notice: "please contact Renesas Technology's sales office before using industrial applications such as automotive systems." It is rated for Standard quality grade (−40°C to +85°C), intended for consumer electronics like cellular phones and camcorders. For automotive use, Renesas recommends contacting their sales office to evaluate alternatives with AEC-Q100 qualification-such as the R1EX24002ASAS0A is not approved for under-hood or safety-critical vehicle subsystems.