Renesas R1EX24032ATAS0I#U0

Overview

R1EX24032ATAS0I from Renesas Electronics is a 32-kbit (4,096 × 8-bit) two-wire serial interface EEPROM with I²C bus compatibility, 400 kHz clock frequency, 5 ms write cycle time, and −40°C to +85°C industrial temperature range. It serves as nonvolatile configuration and calibration storage in microcontroller-based systems requiring reliable, low-power data retention.

For engineers reviewing the R1EX24032ATAS0I datasheet, R1EX24032ATAS0I pinout, R1EX24032ATAS0I application, or R1EX24032ATAS0I equivalent, key selection considerations include its TSSOP-8 package, 1.8–5.5 V single-supply operation, WP-enabled hardware write protection, 32-byte page programming capability, and MONOS memory technology enabling 1,000k endurance cycles and 100-year data retention at 25°C.

Technical Context

This device implements a standard I²C-compatible two-wire serial interface with SDA (open-drain) and SCL (input-only) pins, supporting byte and page write modes up to 32 bytes per cycle. Its internal address generator and high-voltage generator enable autonomous write execution after stop condition detection.

It features three device address pins (A0–A2) for multi-drop bus configuration (up to eight devices), a dedicated WP pin for full-array hardware write protection, and an internal voltage detector ensuring power-on reset functionality to prevent spurious writes during VCC ramp-up/down.

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 and halogen-free (#U0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and M95320-WMN6TP, R1EX24032ATAS0I offers superior long-term data integrity (100-year retention) and hardware-level write protection via dedicated WP pin, making it optimal for safety-critical or maintenance-free deployments where data immutability and archival stability outweigh raw speed or interface flexibility.

Availability

R1EX24032ATAS0I is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical diagnostic equipment, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for R1EX24032ATAS0I 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 global 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-power nonvolatile storage in harsh environments-leveraging MONOS technology to deliver extended endurance and archival-grade data retention without battery backup.

FAQ

What is the maximum I²C clock frequency supported by R1EX24032ATAS0I?

R1EX24032ATAS0I supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This limit applies across the full operating temperature range (−40°C to +85°C) and supply voltage range (1.8 V to 5.5 V). Exceeding this frequency may result in timing violations, failed acknowledgments, or corrupted data transfers. The device does not support Fast Mode Plus (1 MHz) or higher-speed I²C variants.

Does R1EX24032ATAS0I require external pull-up resistors on SDA and SCL lines?

Yes, R1EX24032ATAS0I requires external pull-up resistors on both SDA and SCL lines because the SDA pin has an open-drain structure and SCL is a CMOS input. Recommended values depend on bus capacitance and desired rise time; typical designs use 2.2 kΩ to 10 kΩ resistors to VCC. The datasheet specifies VOL ≤ 0.4 V at IOL = 3.0 mA (VCC = 2.7–5.5 V), guiding proper resistor selection to meet I²C bus specifications.

How does the WP pin function on R1EX24032ATAS0I?

On R1EX24032ATAS0I, the WP (Write Protect) pin provides hardware-level write inhibition: when WP is high (VIH ≥ 0.7×VCC), all write operations-including byte, page, and erase-are disabled, and the device returns a NO ACK ('1') after address reception. When WP is low (VIL ≤ 0.3×VCC), full read/write access is enabled. The pin is internally pulled down, so unconnected WP defaults to write-enabled mode.

What is the write endurance and data retention specification for R1EX24032ATAS0I?

R1EX24032ATAS0I guarantees a minimum endurance of 1,000,000 write/erase cycles at 25°C and 100,000 cycles at 85°C. Data retention is rated at minimum 100 years at 25°C and 10 years at 85°C. These values are based on MONOS memory cell characteristics and are not 100% tested per unit but statistically validated per lot. The device ships with all memory locations pre-programmed to 0xFFh.

Is R1EX24032ATAS0I pin-compatible with other 32 kbit I²C EEPROMs in TSSOP-8 packages?

R1EX24032ATAS0I uses the standard 8-pin TSSOP footprint (PTSP0008JC-B) with identical mechanical dimensions and pinout (A0–A2, VSS, VCC, WP, SCL, SDA) as industry-standard 32 kbit I²C EEPROMs. However, functional pin compatibility requires verification of electrical behavior-especially WP logic polarity, ACK timing, and noise suppression thresholds-as minor differences in AC timing or internal reset behavior may affect interoperability in marginal designs.