Renesas R1EX24512BSAS0I#S0

Overview

R1EX24512BSAS0I from Renesas Electronics is a 512-kbit (64-kword × 8-bit) two-wire serial EEPROM using MONOS memory technology, operating from 1.8 V to 5.5 V supply, supporting up to 1 MHz I²C clock at 2.5–5.5 V, and rated for −40°C to +85°C industrial temperature range. It delivers 128-byte page write capability, 5 ms write cycle time, and 1,000k endurance cycles for embedded system configuration storage.

For engineers reviewing the R1EX24512BSAS0I datasheet, R1EX24512BSAS0I pinout, R1EX24512BSAS0I application, or R1EX24512BSAS0I equivalent, key selection considerations include its SOP-8 package, WP-enabled hardware write protection, I²C-compatible timing compliance (400 kHz/1 MHz), low 2.0 μA standby current, and guaranteed 100-year data retention under specified conditions.

Technical Context

This EEPROM implements a two-wire I²C interface with fixed device code "1010", three hardware address pins (A0–A2) enabling up to eight devices on one bus, and open-drain SDA/SCL requiring external pull-ups. Its internal architecture includes voltage detector, high-voltage generator, and serial-parallel converter for reliable byte/page writes.

Write protection is controlled by the WP pin: logic high disables all writes (full 512-kbit protection), while logic low enables full read/write access. Acknowledge polling supports host synchronization during internal write cycles, and noise suppression filters <50 ns glitches on SCL/SDA inputs.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free and halogen-free, 2.5 mm × 4.89 mm body, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C512-SSHL-T and BR24G512FJ-3GE2, the R1EX24512BSAS0I uniquely combines 1 MHz I²C operation at 2.5–5.5 V, MONOS-based reliability, and guaranteed 100-year retention - making it optimal for time-critical industrial firmware updates and long-lifecycle deployments.

Availability

R1EX24512BSAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration storage, smart meter firmware parameter tables, and medical device configuration profiles requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.

Supply support for R1EX24512BSAS0I 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 leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series targets high-reliability, low-power nonvolatile storage in resource-constrained embedded systems - emphasizing extended data retention, wide voltage operation, and robust I²C interoperability.

FAQ

What is the maximum I²C clock frequency supported by R1EX24512BSAS0I?

The R1EX24512BSAS0I supports up to 1 MHz I²C clock frequency when VCC is 2.5 V to 5.5 V, and 400 kHz when VCC is 1.8 V to 5.5 V. This dual-speed capability allows high-throughput configuration loading in 3.3 V/5 V systems while maintaining compatibility with 1.8 V logic interfaces. The R1EX24512BSAS0I meets standard I²C timing requirements including tLOW, tHIGH, and tSU.STA across both ranges.

Does R1EX24512BSAS0I require external pull-up resistors on SDA and SCL lines?

Yes, R1EX24512BSAS0I requires external pull-up resistors on both SDA and SCL lines because these pins use open-drain output drivers. The datasheet specifies VOL ≤ 0.4 V at 3.0 mA sink current, so resistor value must be selected based on bus capacitance, VCC, and desired rise time. Typical values range from 2.2 kΩ to 10 kΩ depending on system layout and speed requirements. The R1EX24512BSAS0I will not function correctly without properly sized pull-ups.

How does the Write Protect (WP) pin function on R1EX24512BSAS0I?

On the R1EX24512BSAS0I, the WP pin is active-high: when driven high, it disables all write operations across the full 512-kbit memory array, and the device responds with NACK after address transmission. When WP is low, full read/write access is enabled. Unlike A0–A2 pins, WP is not internally pulled - it must be actively driven or hard-tied to VCC/VSS. Leaving WP floating may cause unpredictable write behavior, so the R1EX24512BSAS0I design mandates explicit WP control.

What is the page write size and write cycle time for R1EX24512BSAS0I?

The R1EX24512BSAS0I supports 128-byte page writes, allowing up to 128 bytes to be programmed in a single I²C transaction. Its maximum write cycle time is 5 ms - the duration from STOP condition to completion of internal write and return to standby. This fixed timing enables deterministic host polling via ACK polling, and the R1EX24512BSAS0I guarantees this specification across −40°C to +85°C and 1.8–5.5 V supply range.

Is R1EX24512BSAS0I compatible with standard I²C protocol implementations?

Yes, the R1EX24512BSAS0I fully complies with standard I²C protocol specifications, including START/STOP conditions, 7-bit addressing with R/W bit, ACK/NACK handshaking, and sequential read/write modes (current address, random, and sequential). It uses fixed device code "1010" and supports up to eight devices via A0–A2 pins. All timing parameters - tBUF, tHD.STA, tSU.DAT - are verified per I²C spec, ensuring interoperability with standard MCU I²C peripherals without custom driver modifications. The R1EX24512BSAS0I requires no special protocol extensions.