Renesas R1EX24002ASAS0I#S1

Overview

R1EX24002ASAS0I#S1 from Renesas Electronics is a 2 kbit (256 × 8-bit) two-wire serial I²C EEPROM in 150-mil SOP-8 package, operating from 1.8 V to 5.5 V with 400 kHz clock frequency, 5 ms write cycle time, and 1,000k endurance cycles at 25°C - used for configuration storage in consumer audio equipment and camcorders.

For engineers reviewing the R1EX24002ASAS0I#S1 datasheet, R1EX24002ASAS0I#S1 pinout, R1EX24002ASAS0I#S1 application, or R1EX24002ASAS0I#S1 equivalent, key selection criteria include I²C bus compatibility, 16-byte page write capability, WP pin-controlled hardware write protection, −40°C to +85°C industrial temperature range, and lead-free SOP-8 packaging with PRSP0008DF-B footprint.

Technical Context

This device implements a standard I²C-compatible two-wire interface with fixed 1010 device code and user-configurable A0–A2 address pins enabling up to eight devices on one bus. It uses CMOS process with MNOS memory technology for high reliability and low power.

The internal architecture includes an 8-bit address register, 256-word memory array, serial-parallel converter, and high-voltage generator for write operations. Write protection is controlled exclusively by the WP pin state, with full-array lockout when WP = VIH.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free, surface-mount, 3.9 mm × 4.89 mm body size, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02C-SSHM-T and M95020-WMN6TP, R1EX24002ASAS0I#S1 offers guaranteed 400 kHz I²C timing compliance, integrated WP pin logic matching Renesas platform designs, and documented qualification for consumer audio/camcorder use - making it optimal for cost-sensitive, I²C-native systems where strict timing margins and pinout consistency matter.

Availability

R1EX24002ASAS0I#S1 is available at Aetrix Electronics and suitable for audio equipment configuration, camcorder settings storage, and smart thermostat calibration requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.

Supply support for R1EX24002ASAS0I#S1 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 consumer markets.

The R1EX24xxx series was designed specifically for reliable, low-power nonvolatile storage in space-constrained consumer electronics - emphasizing I²C simplicity, hardware write protection, and extended data retention without backup power.

FAQ

What is the maximum I²C clock frequency supported by R1EX24002ASAS0I#S1?

R1EX24002ASAS0I#S1 supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This value is guaranteed across the full operating temperature range (−40°C to +85°C) and supply voltage range (1.8 V to 5.5 V). Exceeding 400 kHz may result in timing violations, failed ACKs, or corrupted writes - especially under marginal signal integrity conditions.

Does R1EX24002ASAS0I#S1 require external pull-up resistors on SDA and SCL lines?

Yes, R1EX24002ASAS0I#S1 requires external pull-up resistors on both SDA and SCL lines because its I/O structure is open-drain. The datasheet specifies VOL ≤ 0.4 V at IOL = 3.0 mA (for VCC ≥ 2.7 V), so pull-up values must be selected based on bus capacitance, VCC level, and desired rise time - typically 2.2 kΩ to 10 kΩ for standard-mode I²C.

How does the WP pin function on R1EX24002ASAS0I#S1 during power-up sequences?

On R1EX24002ASAS0I#S1, the WP pin must be held at a valid logic level (VIH ≥ 0.7×VCC or VIL ≤ 0.3×VCC) during VCC ramp-up to prevent unintended writes. If WP floats or toggles during power-on, the internal power-on reset may not activate correctly, risking spurious write commands triggered by noise on SCL/SDA. Tie WP to VSS for default write-enable or VCC for default lock.

Can R1EX24002ASAS0I#S1 be used in automotive applications?

R1EX24002ASAS0I#S1 is rated for −40°C to +85°C operation and meets industrial temperature requirements, but Renesas explicitly states that the R1EX24xxx series is authorized for consumer applications (e.g., cellular phones, camcorders, audio equipment). For automotive use, formal qualification per AEC-Q100 and consultation with Renesas sales are mandatory - this part is not pre-qualified for under-hood or safety-critical vehicle systems.

What is the page write capacity of R1EX24002ASAS0I#S1 and how does it affect firmware design?

R1EX24002ASAS0I#S1 supports 16-byte page writes, meaning up to 16 consecutive bytes can be written in a single I²C transaction before the internal write cycle begins. Firmware must align writes to page boundaries (addresses 0x00–0x0F, 0x10–0x1F, etc.) and avoid crossing pages mid-burst - otherwise, data wraps within the page and overwrites earlier bytes. This reduces I²C overhead but requires careful address management in host code.