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Renesas R1EX24128BSAS0I#K0
- Part No.:
- R1EX24128BSAS0I#K0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
R1EX24128BSAS0I#K0.pdf
- Description:
- IC EEPROM 128KBIT I2C 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
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Product details
Overview
R1EX24128BSAS0I#K0 from Renesas Electronics is a 128-kbit (16,384 × 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 in industrial control modules for nonvolatile parameter storage.
For engineers reviewing the R1EX24128BSAS0I#K0 datasheet, R1EX24128BSAS0I#K0 pinout, R1EX24128BSAS0I#K0 application, or R1EX24128BSAS0I#K0 equivalent, key selection considerations include write endurance (1,000k cycles), data retention (100+ years), WP pin-controlled full-memory protection, and SOP-8 package compatibility with legacy board layouts.
Technical Context
This device implements a MONOS-based nonvolatile memory array with integrated I²C protocol controller, voltage detector, and high-voltage generator for byte/page programming. It uses internal address generation and serial-parallel conversion to manage 16,384 × 8-bit memory space via SDA/SCL signaling.
The R1EX24128BSAS0I#K0 supports standard-mode I²C timing (fSCL ≤ 400 kHz), features hardware write protection via dedicated WP pin, and includes automatic page write with 5 ms internal write cycle time - all operating across −40°C to +85°C with 2.0 μA max standby current at 5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128 kbit (16,384 × 8-bit) - supports firmware configuration tables and calibration data storage in resource-constrained embedded systems. |
| Interface | I²C two-wire serial bus - enables shared-bus multi-device topology with minimal PCB routing and no additional level-shifting for 1.8–5.5 V hosts. |
| Max clock frequency | 400 kHz - ensures reliable communication with microcontrollers lacking high-speed I²C peripherals while maintaining <900 ns access time. |
| Page write size | 64 bytes per write cycle - reduces firmware update latency by up to 64× versus byte-write mode in parameter batch writes. |
| Endurance | 1,000,000 write/erase cycles - guarantees >10 years of daily reconfiguration in industrial HMI or sensor node applications. |
| Data retention | 100+ years at +85°C - ensures long-term validity of stored calibration coefficients without periodic refresh. |
| Supply voltage | 1.8 V to 5.5 V - interoperates with both low-power IoT SoCs and legacy 3.3/5 V logic without external regulators. |
Pinout & Package
Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free and halogen-free, with Ni/Pd/Au plating and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device address inputs | Hard-wired to VSS or VCC to select one of eight devices on shared I²C bus; internally pulled down - floating defaults to "000" address. |
| SCL | Serial clock input | Positive-edge sampling input for data-in; negative-edge sampling output for data-out; supports 400 kHz max clock with ≤300 ns rise/fall times. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; transmits ACK/NACK on ninth clock edge during read/write handshaking. |
| WP | Write protect input | Active-high pin disabling all write operations when driven to VIH; not internally pulled - must be actively driven, not left floating. |
| VCC | Power supply | 1.8–5.5 V single supply; bypass capacitor (0.1 μF ceramic) required between VCC and VSS for noise immunity. |
| VSS | Ground reference | System ground return; must be tied to same potential as host MCU ground before power-on to prevent unintended writes. |
Key Features
| Feature | Design Value |
|---|---|
| MONOS memory technology | Enables 1,000k endurance and 100-year data retention without charge-pump wear-out mechanisms typical of floating-gate EEPROMs. |
| 64-byte page write | Reduces firmware update time from ~820 ms (16,384 byte-writes) to ~1.3 s (256 page-writes), minimizing system lockout during configuration changes. |
| Hardware write protection | Full 128 kbit memory block disable via WP pin - prevents accidental overwrites during power transitions or firmware glitches. |
| Low-voltage operation | 1.8 V minimum supply allows direct interfacing with battery-powered MCUs (e.g., Renesas RL78, RA series) without level shifters. |
| Halogen-free & RoHS | Complies with JEDEC J-STD-020 moisture sensitivity level 3 and EU RoHS Directive - suitable for consumer and industrial assembly lines. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values in factory-calibrated pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 100-year retention and 1M-cycle endurance under field recalibration cycles. Use Value: Eliminates need for external backup batteries or supercapacitors while maintaining traceable calibration history across product lifetime. |
Use Scenario: Holding user-selectable therapy parameters and safety limits in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, WP-protected configuration store accessed only during setup mode; immune to brownout-induced corruption. Use Value: Meets IEC 62304 Class B software requirements for persistent data integrity without redundant storage or CRC overhead. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Retaining door lock actuator learning positions and mirror memory settings across ignition cycles. IC Role / Device Role / Timing Role: I²C slave EEPROM interfaced to 5 V automotive MCU; operates reliably at −40°C to +85°C with 2.0 μA standby draw. Use Value: Enables zero-power memory retention during vehicle sleep mode, extending battery life beyond ISO 16750-2 quiescent current limits. |
Use Scenario: Logging tariff schedules, demand-response events, and meter firmware version in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: High-reliability data logger with 64-byte page writes synchronizing timestamped event records to avoid partial writes. Use Value: Ensures atomic updates of billing-critical data blocks even during AC mains interruption or RF interference bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C128C-SSHL-T | Same 128 kbit I²C EEPROM, but rated for 1 MHz clock and 10⁶ endurance; uses different device address mapping (A0–A1 only). | Supports higher-speed hosts (e.g., ARM Cortex-M7); lacks WP pin - requires software write-locking or external logic for full-memory protection. | Select when system clock exceeds 400 kHz or when A2 pin flexibility is unnecessary; verify address conflict avoidance in multi-device buses. |
| M95128-DRMN6TP/K | 128 kbit SPI EEPROM (not I²C); 20 MHz max clock; 40 μA active current; SO8 package with identical footprint but different pinout (no A0–A2, uses HOLD/WE instead of WP). | Requires SPI interface redesign; offers faster random access but eliminates shared-bus capability and hardware WP functionality. | Choose only if migrating from I²C to SPI architecture; not drop-in - PCB layout and firmware driver changes required. |
Compared with AT24C128C-SSHL-T and M95128-DRMN6TP/K, the R1EX24128BSAS0I#K0 provides hardware-enforced full-memory write protection and guaranteed 100-year data retention at +85°C - critical for safety-critical or maintenance-free deployments where software-only safeguards are insufficient.
Availability
R1EX24128BSAS0I#K0 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for R1EX24128BSAS0I#K0 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 power devices for industrial, automotive, and infrastructure markets.
The R1EX24xxx series was designed specifically for high-reliability, low-power nonvolatile storage in cost-sensitive embedded systems - emphasizing MONOS-based endurance, wide-voltage I²C compatibility, and halogen-free packaging for global manufacturing compliance.
FAQ
What is the maximum I²C clock frequency supported by the R1EX24128BSAS0I#K0?
The R1EX24128BSAS0I#K0 supports a maximum I²C clock frequency of 400 kHz, compliant with standard-mode I²C specifications. This is confirmed in the AC Characteristics table (Page 4) of the R10DS0008EJ0400 Rev.4.00 datasheet, where fSCL is specified as 400 kHz max. The device does not support fast-mode (1 MHz) or higher speeds.
Does the R1EX24128BSAS0I#K0 have built-in write protection, and how is it implemented?
Yes, the R1EX24128BSAS0I#K0 includes hardware write protection via the WP (Write Protect) pin. When WP is driven high (VIH), full 128 kbit memory is write-protected; when low (VIL), normal read/write operation is enabled. As stated on Page 6, the WP pin is not internally pulled - it must be actively driven to avoid floating-state malfunction.
What package type and dimensions does the R1EX24128BSAS0I#K0 use?
The R1EX24128BSAS0I#K0 uses a 150-mil 8-pin plastic SOP package (JEITA code FP-8DBV, Renesas code PRSP0008DF-B), measuring 3.90 mm × 4.89 mm × 1.73 mm with 1.27 mm lead pitch. Package dimensions are detailed on Page 15 of the R10DS0008EJ0400 Rev.4.00 datasheet.
How many write/erase cycles can the R1EX24128BSAS0I#K0 endure, and what is its data retention period?
The R1EX24128BSAS0I#K0 guarantees ≥1,000,000 write/erase cycles and ≥100 years of data retention at +85°C, as specified in the Memory cell characteristics section (Page 3) of the R10DS0008EJ0400 Rev.4.00 datasheet. These values are measured under VCC = 1.8–5.5 V and are not 100% tested but statistically validated.
Is the R1EX24128BSAS0I#K0 compatible with 1.8 V microcontrollers, and what is its minimum operating voltage?
Yes, the R1EX24128BSAS0I#K0 operates from 1.8 V to 5.5 V, making it fully compatible with 1.8 V logic families. Its DC Operating Conditions (Page 3) specify VCC(min) = 1.8 V, and it delivers 1.0 mA max active read current and 2.0 μA max standby current at this voltage - enabling direct interface with ultra-low-power MCUs without level shifting.
R1EX24128BSAS0I#K0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 128Kbit
- Memory Organization:
- 16K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
R1EX24128BSAS0I#K0 FAQ
1.How can I place an order for R1EX24128BSAS0I#K0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24128BSAS0I#K0 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 R1EX24128BSAS0I#K0 reliable?
The price and inventory of R1EX24128BSAS0I#K0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24128BSAS0I#K0 is usually 5 days.
3.What payment methods are accepted for R1EX24128BSAS0I#K0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24128BSAS0I#K0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24128BSAS0I#K0?
R1EX24128BSAS0I#K0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24128BSAS0I#K0 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 R1EX24128BSAS0I#K0?
For technical support, including R1EX24128BSAS0I#K0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24128BSAS0I#K0 requirements.
6.How does Aetrix verify that R1EX24128BSAS0I#K0 is sourced from the original manufacturer or authorized distributors?
All R1EX24128BSAS0I#K0 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 R1EX24128BSAS0I#K0 meets industry standards.
7.What is the process for return or replacement of R1EX24128BSAS0I#K0?
All R1EX24128BSAS0I#K0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24128BSAS0I#K0, 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 R1EX24128BSAS0I#K0 part is unused and in its original packaging.
Return procedure for R1EX24128BSAS0I#K0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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