Renesas R1EX24002ATAS0I#U0

Overview

R1EX24002ATAS0I from Renesas Electronics is a 2 kbit (256 × 8-bit) two-wire serial interface EEPROM with I²C-compatible bus interface, 400 kHz clock frequency, and TSSOP-8 package. It operates from 1.8 V to 5.5 V, supports 16-byte page write, and delivers 1,000k write cycles and 100-year data retention at 25°C - deployed in industrial control modules for nonvolatile parameter storage.

For engineers reviewing the R1EX24002ATAS0I datasheet, R1EX24002ATAS0I pinout, R1EX24002ATAS0I application, or R1EX24002ATAS0I equivalent, key selection criteria include supply voltage range (1.8–5.5 V), write protect functionality, page write capability, standby current (≤2.0 μA), and TSSOP-8 thermal/mechanical compatibility with space-constrained PCB layouts.

Technical Context

This device implements a standard I²C protocol with fixed 4-bit device code "1010", 3-bit hardware address pins (A0–A2), and R/W bit control. Its internal architecture includes a MONOS memory array, high-voltage generator, and serial-parallel converter enabling byte/page writes and random/sequential reads.

Write protection is controlled by the WP pin: logic high disables all writes and returns NO ACK; logic low enables full read/write access. Acknowledge polling is supported to detect internal write cycle completion, and noise suppression filters ≤50 ns glitches on SCL/SDA lines.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), 4.4 mm × 3.0 mm footprint, 0.65 mm pitch, lead-free and halogen-free (#U0).

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 R1EX24002ATAS0I offers superior standby current (2.0 μA max vs. 5 μA typical), guaranteed 100-year data retention at 25°C, and native halogen-free construction - making it optimal for long-lifecycle, low-maintenance industrial deployments where power and longevity are prioritized over marginal speed gains.

Availability

R1EX24002ATAS0I is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter calibration storage, and PLC I/O module configuration requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for R1EX24002ATAS0I 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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series targets cost-sensitive, space-constrained embedded systems needing reliable, low-power nonvolatile storage - designed specifically for I²C-based configuration and calibration data retention in harsh environments.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24002ATAS0I?

The R1EX24002ATAS0I supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This allows reliable communication with standard-mode I²C controllers while maintaining noise immunity and timing margins across the full −40°C to +85°C operating range. The R1EX24002ATAS0I does not support fast-mode (1 MHz) or higher speeds.

Does the R1EX24002ATAS0I require external pull-up resistors on the SDA and SCL lines?

Yes, the R1EX24002ATAS0I requires external pull-up resistors on both SDA and SCL lines because these pins use open-drain output drivers. The value must be selected based on bus capacitance, VCC level, and desired rise time - typically 2.2 kΩ to 10 kΩ for 3.3 V systems with ≤400 pF total capacitance. The R1EX24002ATAS0I datasheet specifies VOL ≤0.4 V at 3.0 mA for proper logic-low assertion.

How does the write protect (WP) pin function on the R1EX24002ATAS0I?

When the WP pin of the R1EX24002ATAS0I is driven high (VIH ≥0.7×VCC), all write operations are disabled and the device responds with NO ACK after receiving the device address and memory address. When WP is low (VIL ≤0.3×VCC) or floating (internally pulled down), full read/write access is enabled. This provides hardware-level protection against unintended writes during power-up/down or firmware errors.

What is the page write capacity of the R1EX24002ATAS0I, and how does it improve efficiency?

The R1EX24002ATAS0I supports 16-byte page writes, meaning up to 16 consecutive bytes can be programmed in a single write cycle with one stop condition. This reduces transaction overhead significantly versus byte-wise writes - for example, writing 16 bytes takes one 5 ms internal cycle instead of sixteen separate 5 ms cycles. The R1EX24002ATAS0I automatically increments the lower 4 address bits (a0–a3) during page write, wrapping within the same page boundary.

Is the R1EX24002ATAS0I compatible with standard I²C addressing schemes?

Yes, the R1EX24002ATAS0I uses standard I²C 7-bit addressing with a fixed 4-bit device code "1010" followed by 3-bit hardware-selectable address (A2–A0), resulting in an 8-bit device address word where the LSB is the R/W bit. This matches the I²C specification and ensures interoperability with all compliant masters. The R1EX24002ATAS0I responds only when its hard-wired A2–A0 pins match the transmitted address bits.