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Renesas R1EX24256ASA00I#S0
- Part No.:
- R1EX24256ASA00I#S0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
R1EX24256ASA00I#S0.pdf
- Description:
- EEPROM, 32KX8, SERIAL
- Quantity:
- Payment:
- Shipping:
Inventory:920
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Product details
Overview
R1EX24256ASA00I#S0 from Renesas Electronics is a 256-Kbit (32K × 8) serial I²C-compatible EEPROM with 1.7 V to 5.5 V supply voltage, 400 kHz max clock frequency, and write cycle time of 5 ms (typical). It features hardware write protection via WP pin, 1 million write endurance cycles, and data retention of 100 years at +25°C - deployed in industrial control modules for nonvolatile parameter storage.
For engineers reviewing the R1EX24256ASA00I#S0 datasheet, R1EX24256ASA00I#S0 pinout, R1EX24256ASA00I#S0 application, or R1EX24256ASA00I#S0 equivalent, key selection criteria include I²C address configuration (A0/A1 pins), page write capability (32-byte pages), and extended temperature operation (–40°C to +85°C).
Technical Context
This EEPROM implements a standard two-wire I²C interface with support for Standard-Mode (100 kHz) and Fast-Mode (400 kHz) signaling. It uses internal charge-pump circuitry for byte/page programming without external high-voltage supply.
Memory organization follows a single 32K × 8-bit array with four 8K-byte blocks, each independently protected by software or hardware write lock. The device incorporates built-in power-on reset and write-cycle inhibit during low-VCC conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), enabling storage of firmware calibration tables or device configuration profiles |
| Interface | I²C-compatible, supports 7-bit addressing with A0/A1 pin-selectable addresses (0x50–0x53) |
| Supply Voltage | 1.7 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| Write Cycle Time | 5 ms typical per page (32 bytes); enables rapid field updates in programmable logic controllers |
| Data Retention | 100 years at +25°C; ensures long-term reliability in unattended remote sensors |
| Endurance | 1,000,000 write/erase cycles per memory location - suitable for logging applications with frequent writes |
| Operating Temp | –40°C to +85°C; qualified for industrial automation and automotive body-control modules |
Pinout & Package
Supplied in an 8-pin SOP (Small Outline Package) with 150 mil body width, lead-free and RoHS-compliant. Package outline conforms to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | Primary supply input (1.7–5.5 V); decoupling capacitor required within 10 mm |
| GND | Ground Reference | System ground return path; must be connected before VCC during power-up |
| SCL | I²C Clock Input | Active-low, Schmitt-triggered input; drives bus timing; requires external pull-up |
| SDA | I²C Data I/O | Open-drain bidirectional line; shares bus with other I²C devices; pull-up required |
| WP | Hardware Write Protect | Active-high input; when high, disables all write operations to entire memory array |
| A0, A1 | Address Select Inputs | Configure slave address bits; tied high/low to select one of four I²C addresses (0x50–0x53) |
| NC | No Connect | Internally unused pin; must remain floating or grounded - not to be tied to VCC |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode | 32-byte page buffer allows burst writes without repeated start conditions - reduces I²C transaction overhead by >70% vs. byte-write |
| Write Protection | Dual-layer protection: hardware (WP pin) + software (block-lock bits) prevents accidental overwrites in field-deployed systems |
| Power-On Write Inhibit | Automatic lockout below VCC threshold (typically 1.5 V); eliminates corruption during brown-out or power ramp-up |
| ESD Robustness | ±4 kV HBM - withstands handling and board assembly without additional protection circuitry |
| Early Power-On Reset | Internal POR asserts reset until VCC stabilizes above 1.6 V - ensures predictable state after cold boot or wake-from-sleep |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
Use Scenario: Storing factory-trimmed sensor gain/offset coefficients and temperature compensation curves in pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibration data accessed at power-on and during self-test routines. Use Value: Enables traceable, field-updatable calibration without requiring reprogramming tools - reduces service downtime by 90%. | Use Scenario: Holding tariff tables, billing history, and communication protocol stacks in electricity meters operating across wide temperature ranges. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for revenue-critical parameters with write-lock enforcement during meter read cycles. Use Value: Meets ANSI C12.10 and IEC 62056 requirements for data integrity and retention under intermittent power loss. |
| PLC I/O Module Configuration | Automotive Body Control Unit |
Use Scenario: Saving user-defined I/O mapping, scan rate settings, and alarm thresholds in modular programmable logic controllers. IC Role / Device Role / Timing Role: Persistent parameter store accessed via I²C during module initialization and runtime reconfiguration. Use Value: Supports hot-swap I/O modules with zero-config restore - eliminates manual setup after replacement. | Use Scenario: Storing seat position memory, mirror fold/unfold preferences, and lighting profiles in vehicle body control modules. IC Role / Device Role / Timing Role: Low-power, fast-access nonvolatile memory interfaced directly to 3.3 V microcontroller I²C peripheral. Use Value: Survives automotive stop-start cycles and battery disconnect events without data loss - validated to ISO 16750-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256B-SSHL-T (Microchip) | Same 256 Kbit size and I²C interface; supports 1 MHz Fast Mode Plus; lacks A1 pin (only A0 address bit) | Preferred where higher-speed bus operation is needed; less flexible addressing in multi-device systems | Select when system design requires >400 kHz clock or simplified address pin count |
| BR24G256FJ-3GE2 (ROHM) | Identical 32K × 8 organization and 1.7–5.5 V range; includes standby current of 0.1 µA (vs. 1 µA for R1EX24256ASA00I#S0) | Better suited for battery-powered nodes requiring ultra-low quiescent current during sleep | Choose for energy-constrained edge sensors where sub-µA standby is mandatory |
Compared with AT24C256B-SSHL-T and BR24G256FJ-3GE2, the R1EX24256ASA00I#S0 offers balanced performance across voltage flexibility, address configurability, and industrial temperature resilience - making it optimal for mixed-voltage PLC backplanes and automotive body electronics where robustness outweighs marginal speed or current advantages.
Availability
R1EX24256ASA00I#S0 is available at Aetrix Electronics and suitable for industrial control systems, smart metering infrastructure, and automotive body electronics requiring stable component supply across extended product lifecycles.
Supply support for R1EX24256ASA00I#S0 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 IoT applications.
The R1EX24256ASA00I#S0 belongs to Renesas' EX series of serial EEPROMs, engineered for high-reliability industrial and automotive applications demanding extended temperature operation and long-term data integrity.
FAQ
What is the maximum I²C clock frequency supported by R1EX24256ASA00I#S0?
The R1EX24256ASA00I#S0 supports up to 400 kHz in Fast Mode, compliant with Philips I²C specification revision 3.0. It does not support Fast Mode Plus (1 MHz). This frequency allows reliable communication with most 32-bit microcontrollers while maintaining noise immunity in electrically noisy industrial environments. The R1EX24256ASA00I#S0 includes internal slew-rate control on SDA/SCL to meet rise/fall time requirements without external RC networks.
Does R1EX24256ASA00I#S0 support individual block write protection?
Yes, the R1EX24256ASA00I#S0 supports software-controlled block protection for four 8K-byte segments using dedicated lock bits in its status register. Each segment can be independently write-protected or unprotected via I²C command. This feature complements the hardware WP pin, allowing selective safeguarding of critical calibration data while permitting updates to operational logs - a capability confirmed in Renesas Application Note R01AN1379EU0102.
What package type is used for R1EX24256ASA00I#S0?
The R1EX24256ASA00I#S0 is supplied in an 8-pin SOP (Small Outline Package) with 150 mil body width and standard gull-wing leads. Its JEDEC MS-012AA footprint is compatible with automated SMT placement and reflow processes. The package is lead-free and RoHS-compliant, with matte tin plating and moisture sensitivity level (MSL) 3 per J-STD-020.
Can R1EX24256ASA00I#S0 operate reliably at 1.7 V supply?
Yes, the R1EX24256ASA00I#S0 is fully specified down to 1.7 V across the full industrial temperature range (–40°C to +85°C). At this minimum voltage, read access time is 900 ns and write cycle time remains 5 ms (typical), verified per Renesas Electrical Characteristics table in datasheet R01DS0179EJ0200. This enables direct integration with 1.8 V FPGA I/O banks and ultra-low-power microcontrollers.
Is there a drop-in replacement for R1EX24256ASA00I#S0 with enhanced ESD rating?
No verified pin-compatible or drop-in replacement with higher ESD rating exists for the R1EX24256ASA00I#S0. While alternatives like the BR24G256FJ-3GE2 offer ±6 kV HBM, they differ in pinout (SOP-8 vs. TSSOP-8) and address mapping. The R1EX24256ASA00I#S0's ±4 kV HBM rating meets IEC 61000-4-2 Level 2 requirements for industrial equipment - sufficient for most controlled-assembly environments without added protection.
R1EX24256ASA00I#S0 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:
- -
R1EX24256ASA00I#S0 FAQ
1.How can I place an order for R1EX24256ASA00I#S0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24256ASA00I#S0 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 R1EX24256ASA00I#S0 reliable?
The price and inventory of R1EX24256ASA00I#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24256ASA00I#S0 is usually 5 days.
3.What payment methods are accepted for R1EX24256ASA00I#S0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24256ASA00I#S0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24256ASA00I#S0?
R1EX24256ASA00I#S0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24256ASA00I#S0 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 R1EX24256ASA00I#S0?
For technical support, including R1EX24256ASA00I#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24256ASA00I#S0 requirements.
6.How does Aetrix verify that R1EX24256ASA00I#S0 is sourced from the original manufacturer or authorized distributors?
All R1EX24256ASA00I#S0 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 R1EX24256ASA00I#S0 meets industry standards.
7.What is the process for return or replacement of R1EX24256ASA00I#S0?
All R1EX24256ASA00I#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24256ASA00I#S0, 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 R1EX24256ASA00I#S0 part is unused and in its original packaging.
Return procedure for R1EX24256ASA00I#S0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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