Renesas R1EX24016ATAS0A#U0

Overview

R1EX24016ATAS0A from Renesas Electronics is a 16-kbit (2048 × 8-bit) two-wire serial EEPROM with I²C interface, 1.8–5.5 V single-supply operation, 400 kHz clock frequency, and TSSOP-8 package. It delivers 5 ms write cycle time, 1,000k endurance cycles at 25°C, and 100-year data retention - deployed in consumer electronics for configuration storage and calibration data logging.

For engineers reviewing the R1EX24016ATAS0A datasheet, R1EX24016ATAS0A pinout, R1EX24016ATAS0A application, or R1EX24016ATAS0A equivalent, key selection considerations include its 8-pin TSSOP footprint, WP-enabled hardware write protection, 16-byte page programming capability, and guaranteed operation across −40°C to +85°C industrial temperature range.

Technical Context

This device implements a standard I²C-compatible two-wire bus interface with fixed 1010 device code, supporting up to eight devices on one bus via A0–A2 address pins. Its internal architecture includes a high-voltage generator for MNOS memory cell programming and an automatic page write controller that increments lower address bits (a0–a3) during multi-byte writes.

It features noise suppression (50 ns), acknowledge polling for write-cycle status detection, and power-on reset logic to prevent spurious writes during VCC ramp-up/down. The SDA pin uses open-drain output requiring external pull-up; SCL timing complies with I²C fast-mode specifications including tLOW ≥ 1200 ns and tHIGH ≥ 600 ns.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm lead pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C16D-SSHM-T and BR24T16FJ-WE2, the R1EX24016ATAS0A provides superior data retention (100 years vs. 40/10 years) and integrated WP functionality in a cost-optimized industrial-grade part, making it ideal for consumer electronics where long-term data integrity and simple hardware protection are prioritized over automotive qualification or maximum speed.

Availability

R1EX24016ATAS0A is available at Aetrix Electronics and suitable for consumer audio, smartphone peripheral modules, home appliance control panels, and digital set-top boxes requiring stable component supply and long-lifecycle support.

Supply support for R1EX24016ATAS0A 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 Corporation is a Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and memory solutions.

The R1EX24xxx series was designed specifically for reliable, low-power nonvolatile storage in space-constrained consumer electronics - emphasizing robust I²C compatibility, hardware write protection, and extended data retention without requiring battery backup.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24016ATAS0A?

The R1EX24016ATAS0A supports a maximum I²C clock frequency of 400 kHz, compliant with I²C fast-mode timing specifications. This allows efficient data transfer while maintaining signal integrity on typical PCB traces. The device guarantees tLOW ≥ 1200 ns and tHIGH ≥ 600 ns under all operating conditions, ensuring reliable communication with standard I²C masters. Exceeding 400 kHz may result in missed acknowledgments or corrupted writes.

Does the R1EX24016ATAS0A have built-in write protection, and how is it enabled?

Yes, the R1EX24016ATAS0A includes a dedicated Write Protect (WP) pin that enables hardware-level write lockout. When WP is driven high (VIH ≥ 0.7 × VCC), all write operations - including byte and page writes - are disabled, and the device responds with a NO ACK after address transmission. When WP is low (VIL ≤ 0.3 × VCC), full read/write access is granted. This eliminates reliance on software locks and prevents accidental overwrites during power transitions.

What is the endurance rating of the R1EX24016ATAS0A, and how does temperature affect it?

The R1EX24016ATAS0A is rated for 1,000,000 write/erase cycles at 25°C ambient temperature. At 85°C, endurance reduces to 100,000 cycles per the memory cell characteristics table. This derating reflects accelerated oxide wear at elevated temperatures. For applications involving frequent writes (e.g., logging), thermal management or wear-leveling firmware should be considered. The R1EX24016ATAS0A datasheet specifies these values explicitly on page 4 under "Memory cell characteristics".

Can the R1EX24016ATAS0A operate from a 1.8 V supply, and what are the implications?

Yes, the R1EX24016ATAS0A operates across 1.8 V to 5.5 V, making it compatible with modern low-voltage MCUs. At 1.8 V, VOL1 is specified at ≤ 0.2 V with IOL = 1.5 mA, requiring appropriate pull-up resistor sizing to maintain signal margins. DC characteristics such as ICC1 (read current) and ICC2 (write current) remain within spec, though write cycle time remains fixed at 5 ms regardless of VCC. This ensures predictable timing in battery-powered designs.

How does the R1EX24016ATAS0A handle page boundaries during multi-byte writes?

During page write mode, the R1EX24016ATAS0A automatically increments the lower 4 address bits (a0–a3) for each successive byte written. If the write crosses a 16-byte page boundary, the address rolls over to the start of the same page - overwriting previously written bytes in that page. This behavior is documented in the "Page Write" section (page 13). To avoid unintended overwrites, hosts must ensure write bursts stay within a single 16-byte page or manage address alignment explicitly.