Renesas R1EX24004ATAS0A#S0

Overview

R1EX24004ATAS0A from Renesas Electronics is a 4 kbit (512 × 8-bit) two-wire serial interface EEPROM with I²C bus compatibility, 1.8 V to 5.5 V single-supply operation, and 400 kHz maximum clock frequency. It features 16-byte page write capability, 2 µA max standby current, and operates across −40°C to +85°C for use in consumer electronics firmware storage and configuration retention.

For engineers reviewing the R1EX24004ATAS0A datasheet, R1EX24004ATAS0A pinout, R1EX24004ATAS0A application, or R1EX24004ATAS0A equivalent, this page delivers verified electrical specs, TSSOP-8 pin mapping, endurance (1,000k cycles @25°C), data retention (100 years @25°C), and real-world use cases in audio equipment, camcorders, and cellular phones - all confirmed from Renesas' official REJ03C0353-0101 Rev.1.01 datasheet.

Technical Context

The R1EX24004ATAS0A implements a two-wire I²C-compatible serial interface with fixed device code "1010", supporting up to four devices on one bus via hard-wired A0–A2 address pins. Its internal architecture includes an MNOS memory array with CMOS low-voltage circuitry, enabling fast 5 ms write cycle time and automatic page write control logic.

It integrates write protection via the WP pin (active-high full-array lock), acknowledges all 8-bit words on the ninth SCL edge, and uses open-drain SDA with external pull-up. Noise suppression filters input transients <50 ns, and power-on reset prevents unintended writes during VCC ramp-up.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04-PU and M95040-WMN6TP, the R1EX24004ATAS0A provides optimal balance of I²C compatibility, 1,000k-cycle endurance, and integrated hardware write protection - making it preferred for consumer devices requiring frequent, secure configuration updates without bus protocol conversion.

Availability

R1EX24004ATAS0A is available at Aetrix Electronics and suitable for audio equipment, camcorders, and cellular phone designs requiring stable component supply, long-term data retention, and industrial-grade temperature operation.

Supply support for R1EX24004ATAS0A 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, and memory solutions.

The R1EX24xxx series was designed specifically for consumer electronics applications including cellular phones, camcorders, and audio equipment - emphasizing low-voltage operation, compact packaging, and high reliability under frequent write cycles.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24004ATAS0A?

The R1EX24004ATAS0A supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table (REJ03C0353-0101 Rev.1.01, p.5). This standard-mode speed ensures reliable communication with legacy and modern microcontrollers while maintaining noise immunity and timing margin. The R1EX24004ATAS0A does not support fast-mode (1 MHz) or higher rates.

How does the write protect (WP) pin function on the R1EX24004ATAS0A?

When the WP pin is driven high (VIH), the R1EX24004ATAS0A disables all write operations across its entire 4 kbit memory array and returns a NO ACK ('1') after receiving write data. When WP is low (VIL), full read/write access is enabled. This hardware-level protection prevents accidental overwrites during system initialization or fault conditions - a key safety feature confirmed in the Pin Description and Write Operations sections of the R1EX24004ATAS0A datasheet.

What package type is used for the R1EX24004ATAS0A?

The R1EX24004ATAS0A uses an 8-pin plastic TSSOP package (JEITA code TTP-8DAV, Renesas code PTSP0008JC-B), measuring 4.4 mm × 3.0 mm with 0.65 mm lead pitch. This surface-mount package offers reduced footprint versus SOP-8 variants and is lead-free/RoHS compliant, as documented in the Package Dimensions section (p.22) of the R1EX24004ATAS0A datasheet.

Does the R1EX24004ATAS0A support page write operations, and what is the page size?

Yes, the R1EX24004ATAS0A supports page write operations with a fixed page size of 16 bytes. This allows up to 16 sequential bytes to be loaded into the internal buffer and written in a single 5 ms internal cycle - significantly improving throughput versus byte-write mode. Page boundaries align to 16-byte offsets (e.g., 0x00–0x0F, 0x10–0x1F), and rollover occurs within the same page if exceeded, as defined in the Page Write section (p.13) of the R1EX24004ATAS0A datasheet.

What is the guaranteed data retention period for the R1EX24004ATAS0A at 85°C?

At +85°C operating temperature, the R1EX24004ATAS0A guarantees 10 years of data retention, as explicitly stated in the Memory Cell Characteristics table (p.4) of its datasheet. This is derated from the 100-year specification at 25°C and reflects accelerated charge loss at elevated junction temperatures - a critical design consideration for thermally constrained consumer enclosures.