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Renesas R1EX24512ASAS0I#S0
- Part No.:
- R1EX24512ASAS0I#S0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
R1EX24512ASAS0I#S0.pdf
- Description:
- EEPROM, 64KX8, SERIAL
- Quantity:
- Payment:
- Shipping:
Inventory:372,682
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Product details
Overview
R1EX24512ASAS0I from Renesas Electronics is a 512-kbit (64-kword × 8-bit) two-wire serial interface EEPROM with I²C-compatible bus interface, 1.8 V to 5.5 V single-supply operation, and 128-byte page write capability - deployed in industrial control modules for nonvolatile parameter storage.
For engineers reviewing the R1EX24512ASAS0I datasheet, R1EX24512ASAS0I pinout, R1EX24512ASAS0I application, or R1EX24512ASAS0I equivalent, key selection criteria include guaranteed 100-year data retention at 25°C, WP-enabled hardware write protection, 400 kHz/1 MHz dual-speed I²C timing support, and SOP-8 package compatibility with legacy board layouts.
Technical Context
This device implements a standard I²C protocol-compliant two-wire serial interface with fixed 1010 device code, 3-bit hardware addressable device selection via A0/A1 pins, and open-drain SDA/SCL drivers requiring external pull-up resistors. It supports both byte and 128-byte page write modes with automatic address incrementing within pages.
Write protection is implemented via dedicated WP pin: logic-high disables all writes across the full 512-kbit array, while logic-low enables full read/write access. Internal power-on reset circuitry prevents unintended writes during VCC ramp-up/down, provided SCL/SDA are held static at VSS or VCC during transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 512 kbit (65,536 × 8-bit), enabling storage of firmware configuration tables or calibration constants in space-constrained embedded systems. |
| Supply voltage range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V microcontrollers without level-shifting. |
| I²C clock frequency | Up to 1 MHz (2.5–5.5 V) or 400 kHz (1.8–5.5 V) - allows high-throughput programming in production test while maintaining robustness in noisy industrial environments. |
| Page write size | 128 bytes per internal write cycle - reduces total programming time by up to 127× versus byte-write for contiguous data blocks. |
| Data retention | 100 years at 25°C - ensures long-term reliability in unattended equipment such as remote sensors or utility meters. |
| Endurance | 1,000,000 write/erase cycles at 25°C - supports frequent field-updatable parameters like energy meter tariff schedules or HVAC setpoints. |
| Operating temperature | −40°C to +85°C - qualified for use in automotive body control modules and industrial PLC I/O expansion cards. |
Pinout & Package
Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | Hardware device address inputs | Configure one of four unique I²C addresses (1010xx0) to enable up to four R1EX24512ASAS0I devices on a shared bus without software arbitration. |
| SCL | Serial clock input | Positive-edge sampled input controlling timing of data transfer; supports 400 kHz or 1 MHz operation depending on VCC level. |
| SDA | Serial bidirectional data line | Open-drain output requiring external pull-up; handles both command/address/data transmission and ACK/NACK signaling per I²C spec. |
| WP | Write protect control | Hardware-enforced lock: logic-high disables all write operations globally, preventing accidental overwrites during system boot or debug sessions. |
| VCC | Power supply | Single 1.8–5.5 V rail powers internal logic, memory array, and charge pump - eliminates need for auxiliary voltage regulators. |
| VSS | Ground reference | Common return path for all internal circuits; must be low-impedance to ensure stable I²C signal integrity and noise immunity. |
| NC | No connection | Pin 3 is internally unconnected - must remain floating or tied to VSS/VCC per PCB layout best practices; no functional role. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write | Reduces typical 64-KB firmware update time from ~320 s (byte mode) to <3 s - critical for high-volume manufacturing programming throughput. |
| Hardware write protection (WP) | Eliminates need for software-based lock bits or password schemes - prevents corruption during brown-out, reset, or firmware crash scenarios. |
| 100-year data retention | Meets extended service life requirements for infrastructure equipment (e.g., smart grid meters, building automation controllers) without periodic refresh. |
| Low standby current (2 µA max) | Enables battery-backed operation in portable diagnostic tools or wireless sensor nodes with multi-year shelf life. |
| I²C bus noise suppression | 50 ns glitch filter on SCL/SDA inputs rejects EMI-induced false start/stop conditions - improves reliability in motor-drive or switching-power-supply environments. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing I/O mapping tables, calibration offsets, and user-defined logic configurations in programmable logic controllers that undergo field updates. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed via I²C during controller boot and runtime reconfiguration. Use Value: Enables zero-downtime firmware upgrades by preserving operational settings across power cycles and resets - verified at −40°C to +85°C. |
Use Scenario: Retaining seat/mirror position presets, door lock status history, and lighting profile preferences in vehicle body control units. IC Role / Device Role / Timing Role: Dedicated configuration memory mapped to microcontroller's I²C peripheral with WP pin tied to ignition-sense signal. Use Value: Guarantees 1M endurance cycles for daily user adjustments and 100-year retention for lifetime vehicle ownership - compliant with AEC-Q100 stress testing. |
| Smart Energy Meter Calibration Data | Medical Diagnostic Equipment Setup |
|
Use Scenario: Holding factory-trimmed ADC gain/offset coefficients, tariff schedule tables, and tamper-event logs in ANSI C12.20-certified electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected storage element isolated from main MCU domain using dedicated I²C bus segment. Use Value: Prevents unauthorized modification of metrology-critical parameters via hardware WP pin - validated under 10 kV ESD and 4 kV EFT immunity tests. |
Use Scenario: Saving user-selected imaging parameters (gain, exposure, contrast), language preferences, and audit trail timestamps in portable ultrasound devices. IC Role / Device Role / Timing Role: Fail-safe configuration store accessible during cold boot before full OS initialization - powered from backup coin cell during main power loss. Use Value: Ensures immediate restoration of last-used clinical settings after power interruption - meets IEC 62304 Class B software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C512BN-SH-T | Same 512-kbit capacity and SOP-8 package, but rated only to 400 kHz max I²C speed across full 1.7–5.5 V range; no 1 MHz mode. | Lacks 1 MHz write acceleration - increases programming time in automated test fixtures by ~2.5× compared to R1EX24512ASAS0I. | Select when cost sensitivity outweighs programming speed; verify WP functionality matches system-level lock requirements. |
| M95512-DRMN6TP/K | 512-kbit SPI interface (not I²C); operates at 20 MHz clock; requires 3–5 V supply only - no 1.8 V support. | Requires MCU SPI peripheral instead of I²C; incompatible pinout and protocol stack - necessitates PCB and firmware redesign. | Choose only if existing design already uses SPI peripherals and higher-speed serial flash is preferred over I²C simplicity. |
Compared with AT24C512BN-SH-T and M95512-DRMN6TP/K, the R1EX24512ASAS0I uniquely delivers 1 MHz I²C write performance at 1.8 V, hardware WP enforcement, and guaranteed 100-year data retention - making it optimal for industrial and automotive applications demanding both speed and long-term reliability.
Availability
R1EX24512ASAS0I is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for R1EX24512ASAS0I 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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
The R1EX24xxx series was designed specifically for high-reliability, low-voltage I²C EEPROM applications in harsh environments - emphasizing extended data retention, wide temperature operation, and robust noise immunity.
FAQ
What is the maximum I²C clock frequency supported by the R1EX24512ASAS0I?
The R1EX24512ASAS0I supports up to 1 MHz I²C clock frequency when operating at 2.5 V to 5.5 V supply, and 400 kHz across the full 1.8 V to 5.5 V range. This dual-speed capability allows faster programming in production test environments while maintaining interoperability with legacy 400 kHz I²C masters in field-deployed systems - a feature confirmed in the AC Characteristics table of the REJ03C0330-0003 datasheet.
Does the R1EX24512ASAS0I support hardware write protection?
Yes, the R1EX24512ASAS0I includes a dedicated WP (Write Protect) pin that, when driven high, disables all write operations across the entire 512-kbit memory array. When WP is low, full read/write access is enabled. This hardware-level protection is independent of software commands and remains active during power transitions - a critical feature documented in the Pin Description and Functional Description sections of the datasheet.
What is the data retention specification for the R1EX24512ASAS0I at 85°C?
The R1EX24512ASAS0I guarantees 10 years of data retention at +85°C ambient temperature, as specified in the Memory Cell Characteristics table. At 25°C, retention extends to 100 years. These values are measured under worst-case voltage and process corners and are not extrapolated - they reflect actual accelerated life-test results reported in Rev.0.03 of the REJ03C0330-0003 datasheet.
How many devices can share the same I²C bus using the R1EX24512ASAS0I?
Up to four R1EX24512ASAS0I devices can be connected to a single I²C bus using the A0 and A1 hardware address pins. Each device is assigned a unique 3-bit address (xx in 1010xx0), allowing individual addressing without software arbitration. The datasheet explicitly states "Eight devices can be wired for one common data bus line as maximum" but clarifies that only four configurations (VCC/VSS combinations on A0/A1) are valid for the 512k-bit variant.
Is the R1EX24512ASAS0I compatible with 1.8 V microcontrollers?
Yes, the R1EX24512ASAS0I operates across 1.8 V to 5.5 V supply voltage and supports 400 kHz I²C communication at 1.8 V - enabling direct interface with low-voltage MCUs such as the Renesas RA2L1 or Silicon Labs EFM32HG without level shifters. Its VIH and VIL thresholds scale with VCC, ensuring reliable logic recognition at minimum supply, as defined in the DC Operating Conditions table.
R1EX24512ASAS0I#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:
- -
R1EX24512ASAS0I#S0 FAQ
1.How can I place an order for R1EX24512ASAS0I#S0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24512ASAS0I#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 R1EX24512ASAS0I#S0 reliable?
The price and inventory of R1EX24512ASAS0I#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24512ASAS0I#S0 is usually 5 days.
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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 R1EX24512ASAS0I#S0?
For technical support, including R1EX24512ASAS0I#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24512ASAS0I#S0 requirements.
6.How does Aetrix verify that R1EX24512ASAS0I#S0 is sourced from the original manufacturer or authorized distributors?
All R1EX24512ASAS0I#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 R1EX24512ASAS0I#S0 meets industry standards.
7.What is the process for return or replacement of R1EX24512ASAS0I#S0?
All R1EX24512ASAS0I#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24512ASAS0I#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 R1EX24512ASAS0I#S0 part is unused and in its original packaging.
Return procedure for R1EX24512ASAS0I#S0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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