Renesas R1EX24002ASAS0I#S0

Overview

R1EX24002ASAS0I from Renesas Electronics is a 2 kbit (256 × 8-bit) two-wire serial interface EEPROM with I²C-compatible bus interface, 400 kHz clock frequency, 1.8–5.5 V single-supply operation, and SOP-8 package. It delivers high reliability via MONOS memory technology, supports 16-byte page writes, and is rated for −40°C to +85°C industrial operation in embedded control and sensor calibration systems.

For engineers reviewing the R1EX24002ASAS0I datasheet, R1EX24002ASAS0I pinout, R1EX24002ASAS0I application, or R1EX24002ASAS0I equivalent, key selection considerations include its 5 ms write cycle time, 1,000k endurance at 25°C, 100-year data retention, WP pin-based hardware write protection, and compatibility with standard I²C timing and address decoding (device code 1010).

Technical Context

This EEPROM implements a two-wire I²C serial interface with fixed device code "1010", three hardware address pins (A0–A2), and open-drain SDA/SCL signaling requiring external pull-ups. It uses MONOS nonvolatile memory cells fabricated on a CMOS process with low-voltage circuitry for 1.8 V minimum operation.

Internal architecture includes a voltage detector, serial-parallel converter, X/Y decoders, sense amplifiers, and high-voltage generator for programming. Write operations are internally timed (t_WC = 5 ms max), and acknowledge polling is supported to detect write completion without fixed delay timing.

Key Specifications

Pinout & Package

R1EX24002ASAS0I is housed in an 8-pin SOP (PRSP0008DF-B / FP-8DBV) package measuring 3.9 mm × 4.89 mm with 1.27 mm pitch, lead-free and halogen-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-SSHM-T and BR24G02FJ-3GE2, the R1EX24002ASAS0I offers superior high-temperature endurance (100k cycles @85°C) and a dedicated hardware WP pin-providing fail-safe write inhibition critical in safety-aware systems without relying on firmware state.

Availability

R1EX24002ASAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control applications requiring stable component supply, long-term data integrity, and industrial-temperature operation.

Supply support for R1EX24002ASAS0I 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, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series was designed specifically for robust, low-voltage I²C EEPROM applications in harsh environments-emphasizing MONOS-based reliability, wide VCC range, and hardware write protection for mission-critical data storage.

FAQ

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

The R1EX24002ASAS0I supports a maximum I²C clock frequency of 400 kHz, compliant with Fast-mode I²C specifications. This allows efficient data transfer while maintaining signal integrity on typical PCB traces. The device meets all AC timing requirements-including t_LOW, t_HIGH, and t_SU.STA-at this rate across its full operating voltage (1.8–5.5 V) and temperature (−40°C to +85°C) range. R1EX24002ASAS0I does not support standard-mode (100 kHz) or high-speed mode (3.4 MHz) beyond its specified 400 kHz limit.

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

Yes, the R1EX24002ASAS0I requires external pull-up resistors on both SDA and SCL lines because both pins use open-drain output structures. The recommended value depends on bus capacitance and desired rise time; typical designs use 2.2 kΩ to 10 kΩ resistors tied to VCC. R1EX24002ASAS0I's VOL specification (0.2 V max at 1.5 mA, 1.8–2.7 V) and bus timing constraints (t_R ≤ 300 ns) must be met when selecting resistor values. Failure to install pull-ups will prevent proper I²C communication.

How does the WP pin function on the R1EX24002ASAS0I, and what happens when it is left unconnected?

The WP (Write Protect) pin on the R1EX24002ASAS0I enables hardware-level write inhibition: when driven high (VIH ≥ 0.7 × VCC), it blocks all write operations to the entire 2 kbit array. When low (VIL ≤ 0.3 × VCC), writes are permitted. Internally, WP is pulled down to VSS, so if left unconnected, R1EX24002ASAS0I defaults to write-enabled operation. For reliable protection, Renesas recommends hard-wiring WP to VCC or VSS-not leaving it floating-to avoid noise-induced state transitions.

What is the write cycle time for the R1EX24002ASAS0I, and how can the host controller determine when a write is complete?

The R1EX24002ASAS0I has a maximum write cycle time (t_WC) of 5 ms, measured from the STOP condition to the end of the internal programming operation. To avoid polling delays, the host controller can use acknowledge polling: after issuing a write command and STOP, it repeatedly sends a START + device address (R/W = 0) until the device responds with ACK (0). When ACK is received, the write is complete and the device is ready for the next command. R1EX24002ASAS0I supports this method per its functional description on page 11 of the datasheet.

Is the R1EX24002ASAS0I compatible with 1.8 V microcontrollers, and what are the key DC parameters at that voltage?

Yes, the R1EX24002ASAS0I is fully compatible with 1.8 V systems: its VCC range is 1.8–5.5 V, and it specifies VIH = 0.7 × VCC (≥1.26 V) and VIL = 0.3 × VCC (≤0.54 V) at 1.8 V. At 1.8 V and 25°C, typical active read current is 0.2 mA and standby current is 0.5 μA. Its VOL1 spec (≤0.2 V at 1.5 mA) ensures clean logic-low signaling into 1.8 V I/O receivers. R1EX24002ASAS0I maintains full AC timing compliance-including 400 kHz operation-at 1.8 V, making it suitable for ultra-low-power sensor nodes.