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Renesas R1EX24256BTAS0I#S1
- Part No.:
- R1EX24256BTAS0I#S1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
R1EX24256BTAS0I#S1.pdf
- Description:
- EEPROM, 32KX8, SERIAL
- Quantity:
- Payment:
- Shipping:
Inventory:180
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Product details
Overview
R1EX24256BTAS0I#S1 from Renesas Electronics is a 256-kbit (32-kword × 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 high reliability via MONOS memory technology and supports fast 64-byte page writes for embedded configuration storage in industrial controllers.
For engineers reviewing the R1EX24256BTAS0I#S1 datasheet, R1EX24256BTAS0I#S1 pinout, R1EX24256BTAS0I#S1 application, or R1EX24256BTAS0I#S1 equivalent, key selection criteria include write endurance (1,000k cycles @ 25°C), data retention (100 years @ 25°C), WP-enabled hardware write protection, and compatibility with standard I²C timing budgets up to 400 kHz.
Technical Context
This device implements a two-wire I²C-compatible serial interface with fixed 4-bit device code "1010", 3-bit hardware address pins (A0–A2), and R/W bit control. It uses MONOS nonvolatile memory cells fabricated on a CMOS process with low-voltage circuitry to achieve 1.8 V minimum operating voltage and sub-2 µA standby current.
Internal architecture includes serial-parallel conversion, address generation with X/Y decoders, high-voltage generator for programming, and automatic page-write logic that increments lower 6 address bits (a0–a5) during multi-byte writes. Write protection is implemented via dedicated WP pin asserting full-array lock when driven high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 kbit (32,768 × 8-bit) - supports firmware parameter tables, calibration data, and device identity storage in space-constrained designs. |
| Interface | I²C two-wire serial bus - enables shared-bus connectivity with microcontrollers without requiring additional GPIOs or SPI peripherals. |
| Supply voltage | 1.8 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains and compatible with battery-backed systems down to 1.8 V. |
| Write cycle time | 5 ms max - defines worst-case latency before next command can be issued; supports deterministic timing in real-time control loops. |
| Endurance | 1,000,000 write/erase cycles @ 25°C - ensures >10 years of daily reconfiguration in industrial logging or field-upgrade applications. |
| Data retention | 100 years @ 25°C - guarantees long-term integrity of stored calibration coefficients, serial numbers, or security keys without refresh. |
| Operating temperature | −40°C to +85°C - qualified for use in automotive under-hood modules, factory automation PLCs, and outdoor telecom equipment. |
Pinout & Package
Package: 8-pin plastic TSSOP (PTSP0008JC-B / JEITA code TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm pitch, lead-free, tape-and-reel (3,000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware device address inputs | Enable up to eight R1EX24256BTAS0I#S1 devices on one I²C bus; must be hard-wired to VCC or VSS - floating defaults to VSS. |
| VSS | Ground reference | Common return path for all internal circuits; requires low-impedance connection to system ground plane to minimize noise coupling into SDA/SCL. |
| VCC | Power supply input | Accepts 1.8–5.5 V; includes internal power-on reset to prevent spurious writes during power ramp; turn-on rate must be ≤2 µs/V. |
| WP | Write protect control | Active-high lock: when high, blocks all write operations across full 256 kbit array; allows read-only access regardless of WP state. |
| SCL | Serial clock input | Open-drain compatible; clocks data on rising edge (input) and falling edge (output); max 400 kHz; includes 100 ns noise suppression filter. |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up resistor; data validity window constrained to SCL low period per I²C spec. |
Key Features
| Feature | Design Value |
|---|---|
| MONOS memory cell technology | Enables 1.8 V operation and 1,000k endurance while reducing leakage vs. floating-gate EEPROMs - critical for battery-powered IoT nodes. |
| 64-byte page write | Reduces average write time by ~90% vs. byte-write mode - accelerates bulk updates of configuration blocks or sensor calibration maps. |
| Hardware write protection (WP) | Prevents accidental overwrites during firmware updates or brown-out conditions - eliminates need for software-level lock bits or CRC checks. |
| 100-year data retention | Validated at 25°C; de-rates to 10 years at 85°C - ensures traceability data remains intact over full product lifecycle in medical or infrastructure gear. |
| Lead-free TSSOP-8 package | 0.65 mm pitch, 4.4 × 3.0 mm footprint - provides PCB area savings vs. SOP-8 while maintaining hand-solderability and automated assembly compatibility. |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via I²C during boot and runtime reconfiguration; WP pin tied to system supervisor IC. Use Value: Eliminates need for battery-backed SRAM; retains settings through power loss and firmware updates; 1,000k endurance supports daily parameter tweaks over 10+ years. | Use Scenario: Holding factory-trimmed offset/gain coefficients and linearization tables for MEMS pressure sensors in HVAC and process control transmitters. IC Role / Device Role / Timing Role: Read-once-at-boot data source; write-once-during-calibration storage with WP asserted after final trim to prevent field corruption. Use Value: Ensures measurement accuracy traceability; 100-year retention meets ISO 9001 calibration record requirements; TSSOP-8 fits compact sensor PCBs. |
| Medical Device Serial Number & Audit Log | Automotive Body Control Module Settings |
Use Scenario: Recording unique device ID, manufacturing date, and firmware revision in Class IIa diagnostic equipment subject to FDA 21 CFR Part 11. IC Role / Device Role / Timing Role: Secure, tamper-resistant identity store; WP held high after programming; accessed only by authenticated bootloader during startup. Use Value: Meets regulatory audit trail requirements; MONOS cell stability prevents bit flips under ESD events common in clinical settings. | Use Scenario: Saving user preferences (mirror position, seat memory), fault codes, and adaptive learning values in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3 V MCU; operates reliably during cold-crank (down to 1.8 V) and load-dump transients. Use Value: −40°C to +85°C rating covers under-hood thermal range; 5 ms write time enables logging before ignition-off power collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-PU | Same 256 kbit I²C EEPROM but uses traditional floating-gate cells; 400 kHz max clock; 100-year retention at 25°C; SOIC-8 only. | Larger SOIC-8 footprint (5.3 × 4.4 mm vs. TSSOP-8's 4.4 × 3.0 mm); no MONOS low-voltage advantage below 2.5 V. | Select if legacy SOIC layout exists and 1.8 V operation is not required. |
| M95256-DW | 256 kbit SPI EEPROM; 20 MHz max clock; 1.8–5.5 V; 400 kcycles endurance; 40-year retention at 85°C. | Requires SPI interface and 4 dedicated MCU pins vs. I²C's 2-wire bus; no WP pin - write protection handled in firmware. | Select when higher-speed sequential writes are needed and SPI is already used elsewhere on the board. |
Compared with AT24C256B-PU and M95256-DW, the R1EX24256BTAS0I#S1 offers superior low-voltage write capability (1.8 V), smaller TSSOP-8 footprint, and hardware-enforced write protection - making it optimal for new designs prioritizing space, power, and data integrity.
Availability
R1EX24256BTAS0I#S1 is available at Aetrix Electronics and suitable for industrial automation, smart sensor calibration, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for R1EX24256BTAS0I#S1 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise applications.
The R1EX24xxx series was designed specifically for robust, low-power I²C EEPROM applications in harsh environments - emphasizing MONOS-based endurance, wide voltage operation, and hardware write protection for mission-critical data storage.
FAQ
What is the maximum clock frequency supported by the R1EX24256BTAS0I#S1?
The R1EX24256BTAS0I#S1 supports a maximum I²C clock frequency of 400 kHz, compliant with Fast-mode I²C specifications. This allows reliable communication with most microcontrollers while maintaining noise immunity via built-in 100 ns input filtering on SCL and SDA lines. The R1EX24256BTAS0I#S1 does not support High-speed mode (3.4 MHz) or Ultra-fast mode.
Does the R1EX24256BTAS0I#S1 require an external pull-up resistor on the SDA line?
Yes, the R1EX24256BTAS0I#S1 has an open-drain SDA output structure and requires an external pull-up resistor. The value must be selected based on bus capacitance, VOL specification (≤0.4 V at 3.0 mA for VCC ≥2.7 V), and I²C rise time requirements. Typical values range from 2.2 kΩ to 10 kΩ depending on system layout and speed.
How does the write protection (WP) pin function on the R1EX24256BTAS0I#S1?
When the WP pin is driven high (VIH ≥0.7×VCC), the R1EX24256BTAS0I#S1 disables all write operations across its entire 256 kbit memory array and returns a NO ACK ('1') after receiving write data. When WP is low (VIL ≤0.3×VCC), full read/write access is enabled. The R1EX24256BTAS0I#S1 does not support partial-array write protection.
What is the guaranteed endurance and data retention for the R1EX24256BTAS0I#S1?
The R1EX24256BTAS0I#S1 guarantees 1,000,000 write/erase cycles at 25°C and 100 years of data retention at 25°C. At 85°C, endurance reduces to 100,000 cycles and retention to 10 years - values validated per JEDEC standards and documented in the official Renesas datasheet R10DS0005EJ0101.
Is the R1EX24256BTAS0I#S1 compatible with standard I²C protocol implementations?
Yes, the R1EX24256BTAS0I#S1 implements a fully compliant I²C interface with fixed device code "1010", supports standard start/stop conditions, 7-bit addressing with R/W bit, and acknowledgment polling. It adheres to I²C timing parameters including tLOW (1200 ns min), tHIGH (600 ns min), and tSU.STA (600 ns min), ensuring interoperability with all standard I²C masters.
R1EX24256BTAS0I#S1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- -
- Memory Format:
- -
- Technology:
- -
- Memory Size:
- -
- Memory Organization:
- -
- Memory Interface:
- -
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
R1EX24256BTAS0I#S1 FAQ
1.How can I place an order for R1EX24256BTAS0I#S1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24256BTAS0I#S1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for R1EX24256BTAS0I#S1 reliable?
The price and inventory of R1EX24256BTAS0I#S1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24256BTAS0I#S1 is usually 5 days.
3.What payment methods are accepted for R1EX24256BTAS0I#S1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24256BTAS0I#S1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24256BTAS0I#S1?
R1EX24256BTAS0I#S1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24256BTAS0I#S1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for R1EX24256BTAS0I#S1?
For technical support, including R1EX24256BTAS0I#S1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24256BTAS0I#S1 requirements.
6.How does Aetrix verify that R1EX24256BTAS0I#S1 is sourced from the original manufacturer or authorized distributors?
All R1EX24256BTAS0I#S1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that R1EX24256BTAS0I#S1 meets industry standards.
7.What is the process for return or replacement of R1EX24256BTAS0I#S1?
All R1EX24256BTAS0I#S1 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24256BTAS0I#S1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The R1EX24256BTAS0I#S1 part is unused and in its original packaging.
Return procedure for R1EX24256BTAS0I#S1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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