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Renesas R1EX24128BSAS0I#S1
- Part No.:
- R1EX24128BSAS0I#S1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
R1EX24128BSAS0I#S1.pdf
- Description:
- EEPROM, 16KX8, SERIAL
- Quantity:
- Payment:
- Shipping:
Inventory:1,194
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Product details
Overview
R1EX24128BSAS0I#S1 from Renesas Electronics is a 128-kbit (16,384 × 8-bit) two-wire serial I²C EEPROM in 8-pin SOP package, operating from 1.8 V to 5.5 V with 400 kHz clock frequency, 64-byte page write capability, and industrial −40°C to +85°C temperature range - used for configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the R1EX24128BSAS0I#S1 datasheet, R1EX24128BSAS0I#S1 pinout, R1EX24128BSAS0I#S1 application, or R1EX24128BSAS0I#S1 equivalent, key selection criteria include I²C bus compatibility at 400 kHz, write endurance of 1,000k cycles at 25°C, data retention of 100 years, WP pin-controlled full-memory write protection, and SOP-8 footprint compatibility with legacy board layouts.
Technical Context
This device implements a standard I²C-compatible two-wire interface with fixed 4-bit device code "1010", 3-bit hardware address pins (A0–A2), and R/W bit control - enabling up to eight devices on a shared bus. It uses MNOS memory technology with CMOS low-voltage circuitry for reliable operation across its 1.8–5.5 V supply range.
The internal architecture includes an address generator, X/Y decoders, 64-byte page buffer, and serial-parallel converter. Write operations are internally timed (tWC = 5 ms max), with acknowledge polling supported to detect write completion without fixed delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128 kbit (16,384 × 8-bit) - supports firmware parameter tables, calibration coefficients, and device ID storage in space-constrained designs. |
| Interface | I²C two-wire serial bus - requires only SCL/SDA lines and pull-up resistors; compatible with standard microcontroller I²C peripherals. |
| Max clock frequency | 400 kHz - enables ~100 kbit/s effective write throughput with page writes, suitable for infrequent but deterministic configuration updates. |
| Write endurance | 1,000,000 cycles at 25°C - ensures long-term reliability in applications requiring periodic field-updatable settings (e.g., energy meter tariff tables). |
| Data retention | 100 years at 25°C - guarantees nonvolatile storage integrity over full product lifecycle without refresh or backup power. |
| Supply voltage | 1.8 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains, eliminating level-shifting requirements in mixed-voltage systems. |
| Operating temperature | −40°C to +85°C - qualified for industrial-grade deployment in motor drives, HVAC controls, and factory automation equipment. |
Pinout & Package
Package: 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), 3.9 mm × 4.89 mm body, 1.27 mm pitch, lead-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware device address inputs | Set unique I²C slave address (3-bit code); tied to VSS or VCC to select one of eight possible addresses on shared bus. |
| VSS | Ground reference | Return path for all internal circuitry; must be low-impedance connection to system ground plane. |
| VCC | Power supply input | Accepts 1.8–5.5 V; bypass capacitor (0.1 µF ceramic) required within 10 mm for stable read/write operation. |
| WP | Write protect control | High = full 128 kbit write protection; low = normal read/write; open-drain compatible with microcontroller GPIO. |
| SCL | Serial clock input | Driven by master; rising edge latches data into device, falling edge outputs data; 400 kHz max frequency. |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up resistor (typically 2.2–10 kΩ) to VCC for proper I²C signaling. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte page write | Reduces average write time per byte by >90% vs. byte-write mode - critical for efficient firmware update logging or sensor history buffers. |
| Write protect (WP) pin | Hardware-enforced full-memory lockout when asserted - prevents accidental corruption during power transitions or firmware glitches. |
| Low standby current | 2 µA maximum - enables use in battery-backed or energy-harvesting systems where quiescent power must remain sub-µA. |
| Automatic address increment | Supports sequential read/write without re-sending address bytes - simplifies driver implementation and reduces I²C bus overhead. |
| Power-on reset (POR) circuit | Prevents spurious writes during VCC ramp-up or brownout - eliminates need for external reset supervision in cost-sensitive designs. |
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: Nonvolatile configuration register bank accessed via I²C during boot and runtime reconfiguration. Use Value: Enables field-upgradable control logic without firmware reflashing; 100-year data retention ensures settings survive equipment replacement cycles. |
Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation tables for MEMS pressure sensors in HVAC systems. IC Role / Device Role: Calibration data repository read once at power-on and applied to ADC output scaling routines. Use Value: Eliminates need for external trim potentiometers or laser trimming; 1,000k endurance supports recalibration during service intervals. |
| Power Supply Unit (PSU) Settings Backup | Embedded Display Module Font/Icon Storage |
|
Use Scenario: Preserving user-adjusted voltage/current limits, fan curves, and protection trip points in AC-DC and DC-DC power supplies. IC Role / Device Role: Persistent settings manager interfaced to PSU microcontroller over I²C; WP pin tied to system security signal. Use Value: Maintains safe operational defaults after unexpected power loss; −40°C to +85°C rating matches PSU thermal envelope. |
Use Scenario: Storing custom glyphs, language-specific character sets, and UI theme assets for industrial HMI displays with limited internal flash. IC Role / Device Role: External font ROM accessed on-demand during GUI rendering to reduce main MCU flash usage. Use Value: 128 kbit capacity supports >200 Unicode glyphs at 8×16 pixel resolution; SOP-8 footprint minimizes PCB real estate impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C128B-PU | Same 128 kbit density and SOP-8 package, but rated for 1 MHz I²C clock and 1M write cycles at 85°C (vs. 100k at 85°C for R1EX24128BSAS0I#S1). | Better suited for high-temperature environments (>70°C ambient) or systems requiring faster configuration loads. | Select AT24C128B-PU if 1 MHz I²C speed or extended high-temp endurance is required; verify WP pin behavior and power-on timing match. |
| M95128-DRMN6TP/K | 128 kbit SPI interface (not I²C), 8-pin SO8 package, 5.5 V max supply, 10M write cycles, 40-year retention at 85°C. | Requires SPI host interface and different driver stack; no built-in WP pin - protection implemented via software or external logic. | Choose M95128-DRMN6TP/K only when SPI is already dominant in the system and I²C bus loading must be avoided. |
Compared with AT24C128B-PU and M95128-DRMN6TP/K, the R1EX24128BSAS0I#S1 offers tighter integration with legacy I²C-based industrial controllers, lower active current (5 mA write vs. 6 mA), and Renesas' long-term supply commitment for automotive-qualified variants - making it optimal for cost-sensitive, thermally stable applications where 400 kHz bandwidth suffices.
Availability
R1EX24128BSAS0I#S1 is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor modules, power supply units, and embedded display systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for R1EX24128BSAS0I#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 infrastructure markets.
The R1EX24xxx series was designed specifically for robust, low-power I²C-based configuration and calibration storage in industrial equipment - emphasizing reliability, wide voltage operation, and hardware write protection.
FAQ
What is the maximum I²C clock frequency supported by the R1EX24128BSAS0I#S1?
The R1EX24128BSAS0I#S1 supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This allows reliable communication with standard-mode I²C masters while maintaining noise immunity and timing margins across its full −40°C to +85°C operating range. The R1EX24128BSAS0I#S1 does not support fast-mode (1 MHz) I²C operation.
Does the R1EX24128BSAS0I#S1 require external pull-up resistors on SDA and SCL lines?
Yes, the R1EX24128BSAS0I#S1 requires external pull-up resistors on both SDA and SCL lines because its SDA pin uses an open-drain structure and SCL is a passive input. Typical values range from 2.2 kΩ to 10 kΩ to VCC, selected based on bus capacitance, desired rise time, and I²C speed - with 4.7 kΩ being common for 400 kHz operation on moderate-length traces.
How does the WP pin function on the R1EX24128BSAS0I#S1?
When the WP pin of the R1EX24128BSAS0I#S1 is driven high (VIH ≥ 0.7 × VCC), it enables full 128 kbit write protection - causing the device to respond with NACK to all write attempts. When WP is low (VIL ≤ 0.3 × VCC), normal read and write operations are permitted. The WP pin status is sampled at the start of each write cycle, not continuously monitored.
What is the write cycle time for the R1EX24128BSAS0I#S1, and how is it managed?
The R1EX24128BSAS0I#S1 has a maximum internal write cycle time (tWC) of 5 ms, which begins after a STOP condition ends a write sequence. During this period, the device does not respond to new I²C commands. Acknowledge polling - sending repeated START + device address (R/W=0) - allows the host to detect completion when ACK is received, avoiding fixed delays and improving system responsiveness.
Is the R1EX24128BSAS0I#S1 pin-compatible with other 128 kbit I²C EEPROMs in SOP-8 packages?
The R1EX24128BSAS0I#S1 uses standard I²C pin assignments (A0–A2, VSS, VCC, WP, SCL, SDA) in 8-pin SOP, matching industry conventions. However, pin compatibility with other vendors' 128 kbit EEPROMs (e.g., Microchip AT24C128) is not guaranteed due to differences in WP pin behavior, power-on timing, and internal address mapping - validation against target system timing and firmware is required before substitution.
R1EX24128BSAS0I#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:
- -
R1EX24128BSAS0I#S1 FAQ
1.How can I place an order for R1EX24128BSAS0I#S1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24128BSAS0I#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 R1EX24128BSAS0I#S1 reliable?
The price and inventory of R1EX24128BSAS0I#S1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24128BSAS0I#S1 is usually 5 days.
3.What payment methods are accepted for R1EX24128BSAS0I#S1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24128BSAS0I#S1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24128BSAS0I#S1?
R1EX24128BSAS0I#S1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24128BSAS0I#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 R1EX24128BSAS0I#S1?
For technical support, including R1EX24128BSAS0I#S1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24128BSAS0I#S1 requirements.
6.How does Aetrix verify that R1EX24128BSAS0I#S1 is sourced from the original manufacturer or authorized distributors?
All R1EX24128BSAS0I#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 R1EX24128BSAS0I#S1 meets industry standards.
7.What is the process for return or replacement of R1EX24128BSAS0I#S1?
All R1EX24128BSAS0I#S1 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24128BSAS0I#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 R1EX24128BSAS0I#S1 part is unused and in its original packaging.
Return procedure for R1EX24128BSAS0I#S1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1EX24128BSAS0I#S1 Tags
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