Renesas R1EX24256BTAS0I#S0

Overview

R1EX24256BTAS0I from Renesas Electronics is a 256-kbit (32-kword × 8-bit) two-wire serial EEPROM with I²C interface, 400 kHz clock support, 1.8–5.5 V single-supply operation, and 64-byte page write capability - deployed for nonvolatile parameter storage in industrial control modules, sensor calibration systems, and embedded power management units.

For engineers reviewing the R1EX24256BTAS0I datasheet, R1EX24256BTAS0I pinout, R1EX24256BTAS0I application, or R1EX24256BTAS0I equivalent, key selection considerations include its TSSOP-8 package footprint, WP-enabled hardware write protection, 5 ms write cycle time, −40 to +85°C industrial temperature range, and compatibility with standard I²C bus timing requirements.

Technical Context

This EEPROM implements MONOS (Metal-Oxide-Nitride-Oxide-Silicon) memory technology on a CMOS process, enabling high endurance (≥1,000k cycles) and 100-year data retention without external backup power. Its internal address generator and serial-parallel converter manage 13-bit addressing (A0–A12) across 32,768 bytes.

The device uses open-drain SDA/SCL pins with internal voltage detector and power-on reset circuitry to prevent spurious writes during VCC ramp-up/down. Write protection is controlled by a dedicated WP pin that disables all write operations when driven high, independent of I²C command flow.

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C256B-PU and M95256-DFMN6TP, the R1EX24256BTAS0I provides superior long-term data integrity (100-year retention) and hardware write protection in a compact TSSOP-8 package - making it optimal for space-constrained industrial and medical applications demanding guaranteed 25+ year field life.

Availability

R1EX24256BTAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, and medical device configuration requiring stable component supply across extended product lifecycles.

Supply support for R1EX24256BTAS0I 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 memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series was designed specifically for high-reliability, low-power nonvolatile storage in harsh industrial environments - emphasizing endurance, retention, and robustness against voltage transients and EMI.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24256BTAS0I?

The R1EX24256BTAS0I supports a maximum I²C clock frequency of 400 kHz, compliant with Fast-mode I²C specifications. This allows efficient data transfer while maintaining timing margins for noise-prone industrial buses. The device meets all AC timing requirements including tLOW ≥1200 ns and tHIGH ≥600 ns at this rate, and the R1EX24256BTAS0I operates reliably across its full 1.8–5.5 V supply range and −40 to +85°C temperature range.

How does the write protect (WP) pin function on the R1EX24256BTAS0I?

When the WP pin of the R1EX24256BTAS0I is driven high (VIH ≥0.7×VCC), all write operations - including byte and page writes - are disabled at the hardware level, and the device responds with a NO ACK (acknowledgment "1") after receiving write data. When WP is low, full read/write access is enabled. The R1EX24256BTAS0I datasheet explicitly states that the WP pin is not internally pulled down, so it must be actively tied to VCC or ground - never left floating.

What package type is used for the R1EX24256BTAS0I?

The R1EX24256BTAS0I uses an 8-pin plastic TSSOP package (JEITA code PTSP0008JC-B, Renesas code TTP-8DAV), measuring 4.4 mm × 3.0 mm with 0.65 mm lead pitch. This surface-mount package offers higher density than SOP-8 and is RoHS-compliant, lead-free, and halogen-free. It is distinct from the SOP-8 variant R1EX24256BSAS0I and cannot be substituted without PCB layout changes.

Does the R1EX24256BTAS0I require external pull-up resistors on SDA and SCL lines?

Yes, the R1EX24256BTAS0I requires external pull-up resistors on both SDA and SCL lines because these pins use open-drain output drivers. The recommended value depends on bus capacitance and desired rise time - typically 2.2 kΩ to 10 kΩ for 3.3 V systems with ≤400 pF total capacitance. The R1EX24256BTAS0I datasheet specifies VOL ≤0.4 V at IOL = 3.0 mA (VCC = 2.7–5.5 V), guiding proper resistor selection to meet I²C timing constraints.

What is the endurance and data retention specification for the R1EX24256BTAS0I?

The R1EX24256BTAS0I guarantees a minimum endurance of 1,000,000 write/erase cycles and a minimum data retention of 100 years at +85°C - enabled by MONOS memory technology. These values are specified under worst-case operating conditions (VCC = 1.8–5.5 V, Ta = −40 to +85°C) and are not 100% tested but statistically validated. The R1EX24256BTAS0I outperforms standard floating-gate EEPROMs in both metrics, making it suitable for applications requiring multi-decade field life without maintenance.