Renesas R1EX24032ASAS0I#S0

Overview

R1EX24032ASAS0I from Renesas Electronics is a 32-kbit (4,096 × 8-bit) two-wire serial EEPROM with I²C interface, MONOS memory technology, 400 kHz clock support, and 1.8–5.5 V single-supply operation. It delivers high reliability in industrial control modules requiring nonvolatile parameter storage with write protection and page-write acceleration.

For engineers reviewing the R1EX24032ASAS0I datasheet, R1EX24032ASAS0I pinout, R1EX24032ASAS0I application, or R1EX24032ASAS0I equivalent, this device supports fast 32-byte page writes, 5 ms write cycle time, 1,000k endurance cycles at 25°C, 100-year data retention, and operates across −40 to +85°C for embedded system configuration memory.

Technical Context

This EEPROM implements a two-wire I²C-compatible serial bus interface with fixed 1010 device code, 3-bit hardware address pins (A0–A2), and open-drain SDA/SCL signaling. It uses MONOS charge-trap memory cells fabricated on CMOS process for low-voltage operation and high endurance.

The device integrates internal voltage detection, automatic page write logic (32-byte boundary alignment), and write-protect control via dedicated WP pin. Its timing complies with standard I²C AC characteristics including tLOW ≥1200 ns, tHIGH ≥600 ns, and tWC = 5 ms max for full-page write completion.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free and halogen-free (#S0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and M95320-DRMN3TP/K, R1EX24032ASAS0I provides superior data retention (100 vs. 40 years), integrated hardware write protection, and MONOS-based endurance stability over temperature-making it optimal for unattended industrial deployments.

Availability

R1EX24032ASAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, motor drive configuration, smart meter firmware patch storage, and PLC I/O module identity requiring stable component supply across extended product lifecycles.

Supply support for R1EX24032ASAS0I 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 targets industrial and embedded systems needing reliable, low-voltage, long-life nonvolatile memory with robust I²C integration-designed specifically for parameter storage in harsh environments.

FAQ

What is the maximum I²C clock frequency supported by R1EX24032ASAS0I?

R1EX24032ASAS0I supports a maximum I²C clock frequency of 400 kHz, compliant with standard-mode I²C specifications. This allows direct interfacing with most microcontroller I²C peripherals without requiring high-speed mode configuration. The device guarantees tLOW ≥1200 ns and tHIGH ≥600 ns under all operating conditions from −40 to +85°C.

Does R1EX24032ASAS0I require external pull-up resistors on SDA and SCL lines?

Yes, R1EX24032ASAS0I requires external pull-up resistors on both SDA and SCL lines because its SDA and SCL pins use open-drain output structures. The recommended value depends on bus capacitance and desired rise time; typical values range from 2.2 kΩ to 10 kΩ for 400 kHz operation with ≤400 pF total bus capacitance, as specified in the I²C bus standard.

How does the WP pin function on R1EX24032ASAS0I?

When the WP pin on R1EX24032ASAS0I is driven high (VIH ≥0.7×VCC), it enables full 32kbit write protection-any write attempt returns NACK and fails. When WP is low (VIL ≤0.3×VCC) or left unconnected (internally pulled down), normal read/write operations are permitted. This hardware-level lock prevents unintended writes during power transitions or software faults.

What is the write endurance and data retention specification for R1EX24032ASAS0I?

R1EX24032ASAS0I guarantees ≥1,000,000 write/erase cycles at 25°C and ≥100 years of data retention at 25°C, based on MONOS memory cell characteristics. At 85°C, endurance reduces to ≥100,000 cycles and retention to ≥10 years. These values are measured per JEDEC standards and reflect actual cell-level performance-not accelerated test projections.

Is R1EX24032ASAS0I pin-compatible with other 8-pin SOP EEPROMs like AT24C32?

No, R1EX24032ASAS0I is not pin-compatible with AT24C32 in SOP-8 package despite identical pin count and footprint. While both use A0–A2, VSS, VCC, WP, SCL, and SDA, the pin order differs: R1EX24032ASAS0I places A0–A2 on pins 1–3, whereas AT24C32 places them on pins 5–7. PCB layout must follow Renesas' SOP-8 pinout (PRSP0008DF-B) to ensure correct connectivity.