My Inquiry
My Account
Renesas R1EX24256BSAS0I#K0
- Part No.:
- R1EX24256BSAS0I#K0
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
R1EX24256BSAS0I#K0.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,425
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R1EX24256BSAS0I#K0 from Renesas Electronics is a 256-kbit (32-kword × 8-bit) two-wire serial EEPROM with I²C interface, MONOS memory technology, and SOP-8 package. It operates from 1.8 V to 5.5 V, supports 400 kHz clock frequency, delivers 64-byte page write capability, and is rated for −40°C to +85°C industrial temperature range - used for firmware parameter storage in embedded control modules.
For engineers reviewing the R1EX24256BSAS0I#K0 datasheet, R1EX24256BSAS0I#K0 pinout, R1EX24256BSAS0I#K0 application, or R1EX24256BSAS0I#K0 equivalent, key selection criteria include guaranteed 1,000k write endurance, 100-year data retention, write-protect pin functionality, low-power standby current (≤2.0 μA), and halogen-free copper-bonded construction per #K0 suffix.
Technical Context
This EEPROM implements a two-wire I²C-compatible serial interface with fixed device code "1010", supporting up to eight devices on one bus via A0–A2 address pins. Its internal architecture includes a high-voltage generator, address/data latches, and a serial-parallel converter enabling byte and page write operations.
The device uses MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trap memory cells fabricated on CMOS process, delivering high reliability without floating-gate wear-out mechanisms. Write protection is hardware-controlled via the WP pin, which disables all writes when driven high, and the internal address counter enables current-address and sequential read modes without external address input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 kbit (32,768 × 8-bit); sufficient for storing full configuration sets or calibration tables in microcontroller-based systems |
| Interface | I²C two-wire serial bus; compatible with standard microcontroller I²C peripherals without level-shifting at 3.3 V or 5 V |
| Max clock frequency | 400 kHz; enables ~32 kbit/s effective write throughput during page programming |
| Write cycle time | 5 ms max per page; deterministic timing allows precise host-side polling or timeout handling |
| Endurance | ≥1,000,000 write/erase cycles; supports frequent field-updatable parameters in industrial logging applications |
| Data retention | ≥100 years at +85°C; ensures long-term validity of stored calibration or security keys over product lifetime |
| Supply voltage | 1.8 V to 5.5 V; interoperable across mixed-voltage designs including battery-backed and USB-powered systems |
| Operating temp | −40°C to +85°C; qualified for industrial-grade embedded controllers and automotive body electronics |
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 VCC/VSS to select one of eight possible I²C addresses; internally pulled down, so unconnected = logic low |
| VSS | Ground reference | Primary return path for all internal circuitry and I/O leakage; must be low-impedance connection to system ground plane |
| VCC | Power supply | Single 1.8–5.5 V supply; requires local 0.1 μF ceramic bypass capacitor between VCC and VSS per layout guidelines |
| WP | Write protect control | Active-high hardware lock: drives high to disable all write operations; must not float - tie to VCC or ground |
| SCL | Serial clock input | Open-drain compatible; requires external pull-up; controls timing of all data transfers with 400 kHz max frequency |
| SDA | Serial data I/O | Bidirectional open-drain line; requires external pull-up; carries device address, memory address, and data with ACK/NACK signaling |
Key Features
| Feature | Design Value |
|---|---|
| MONOS memory cell technology | Enables 1M+ endurance and 100-year data retention without degradation from repeated write cycling |
| 64-byte page write | Reduces firmware update time by up to 64× versus byte-write mode; eliminates need for host-side write buffering |
| Hardware write protection (WP pin) | Prevents accidental overwrites during power transitions or software faults; no firmware dependency required |
| Low-power operation | Standby current ≤2.0 μA at 5.5 V enables always-on storage in battery-critical applications like smart meters |
| Halogen-free & lead-free (#K0) | Complies with RoHS and JEDEC J-STD-020; supports environmentally regulated industrial and consumer deployments |
Applications
| Industrial PLC Configuration Storage | Smart Meter Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning constants, and alarm thresholds in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via I²C during boot and runtime reconfiguration; retains values across AC power loss. Use Value: Eliminates need for backup batteries or supercapacitors while guaranteeing 100-year data integrity under thermal stress. | Use Scenario: Holding meter-specific calibration coefficients, tariff tables, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected storage node interfaced to metrology SoC; WP pin tied high during normal operation to prevent corruption. Use Value: Achieves Class 0.2 accuracy compliance by preserving factory calibration across 20+ year service life without recalibration. |
| Medical Device Setup Profiles | Automotive Body Control Module Settings |
Use Scenario: Saving user-selectable therapy parameters (e.g., pressure ramp rates, alarm limits) in portable respiratory devices with regulatory traceability requirements. IC Role / Device Role / Timing Role: FDA-aligned nonvolatile memory storing auditable configuration history; accessed only during setup mode via isolated I²C bus. Use Value: Supports 21 CFR Part 11 electronic record integrity through deterministic write timing and 1M-cycle endurance for audit log updates. | Use Scenario: Storing seat position memory, mirror fold settings, and lighting preferences in vehicle door modules operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfaced to 8-bit MCU; powered from local 5 V rail with noise-suppressed VCC decoupling. Use Value: Ensures settings persist through cold cranking events and battery disconnects without requiring EEPROM refresh routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C256-SSHL-T (Microchip) | Same 256-kbit I²C EEPROM, but uses traditional floating-gate technology; 100k endurance vs. 1M; 40-year retention | Limited to lower-duty-cycle applications where write frequency is <100×/day | Choose if cost sensitivity outweighs longevity requirements and legacy design reuse is prioritized |
| BR24G256FJ-3GE2 (ROHM) | 256-kbit I²C EEPROM with 1.7–5.5 V range; 400 kHz max; 1M endurance; TSSOP-8 only (no SOP-8 variant) | Requires PCB redesign for TSSOP-8 footprint; lacks #K0 halogen-free copper-bond option | Choose only if board space constraints mandate TSSOP and halogen-free requirement is secondary |
Compared with AT24C256-SSHL-T and BR24G256FJ-3GE2, the R1EX24256BSAS0I#K0 uniquely combines SOP-8 packaging, halogen-free copper bonding, MONOS-based 1M-cycle endurance, and guaranteed 100-year data retention - making it optimal for long-lifecycle industrial and medical deployments where field reliability is non-negotiable.
Availability
R1EX24256BSAS0I#K0 is available at Aetrix Electronics and suitable for industrial PLC configuration storage, smart meter calibration data retention, and medical device setup profiles requiring stable component supply across multi-year production programs.
Supply support for R1EX24256BSAS0I#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 memory solutions for industrial, automotive, and infrastructure markets.
The R1EX24xxx series was designed specifically for high-reliability, low-power nonvolatile storage in resource-constrained embedded systems - emphasizing endurance, data retention, and robust I²C interoperability over raw speed.
FAQ
What is the maximum I²C clock frequency supported by the R1EX24256BSAS0I#K0?
The R1EX24256BSAS0I#K0 supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This allows reliable communication with standard microcontroller I²C peripherals without requiring high-speed mode hardware. The device meets timing requirements including tLOW ≥1200 ns and tHIGH ≥600 ns at this rate, ensuring compatibility across diverse host platforms.
Does the R1EX24256BSAS0I#K0 require external pull-up resistors on SDA and SCL lines?
Yes, the R1EX24256BSAS0I#K0 requires external pull-up resistors on both SDA and SCL lines because these pins use open-drain output structures. The datasheet specifies VOL ≤0.4 V at IOL = 3.0 mA (for VCC ≥2.7 V), so resistor value must be selected based on bus capacitance, VCC level, and desired rise time - typically 2.2 kΩ to 10 kΩ for standard-mode I²C.
How does the write-protect (WP) pin function on the R1EX24256BSAS0I#K0?
On the R1EX24256BSAS0I#K0, the WP pin is an active-high hardware lock: when driven high (VIH ≥0.7×VCC), it disables all write operations across the full 256-kbit array and returns NACK after address transmission. When low, full read/write access is enabled. The pin has no internal pull-down, so it must be actively tied to VCC or ground - floating is prohibited per datasheet guidance.
What is the significance of the "#K0" suffix in R1EX24256BSAS0I#K0?
The "#K0" suffix in R1EX24256BSAS0I#K0 indicates halogen-free construction with copper inner wire bonding (as opposed to gold in #U0 or #S0 variants) and tape-and-reel packaging of 4,000 units per reel. This variant complies with JEDEC J-STD-020 moisture sensitivity level 3 and meets RoHS Directive 2011/65/EU requirements for restricted substances.
Can the R1EX24256BSAS0I#K0 retain data for 100 years under real-world conditions?
Yes - the R1EX24256BSAS0I#K0 guarantees ≥100 years of data retention at +85°C per its memory cell characteristics specification, validated using MONOS technology's inherent charge-trap stability. This rating applies under continuous operation at maximum rated temperature and voltage; actual field retention in typical industrial environments (e.g., +40°C average) exceeds 200+ years based on Arrhenius modeling in Renesas qualification reports.
R1EX24256BSAS0I#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:
- 256Kbit
- Memory Organization:
- 32K 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
R1EX24256BSAS0I#K0 FAQ
1.How can I place an order for R1EX24256BSAS0I#K0 through Aetrix?
Please submit a Request for Quotation (RFQ) for R1EX24256BSAS0I#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 R1EX24256BSAS0I#K0 reliable?
The price and inventory of R1EX24256BSAS0I#K0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24256BSAS0I#K0 is usually 5 days.
3.What payment methods are accepted for R1EX24256BSAS0I#K0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24256BSAS0I#K0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R1EX24256BSAS0I#K0?
R1EX24256BSAS0I#K0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R1EX24256BSAS0I#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 R1EX24256BSAS0I#K0?
For technical support, including R1EX24256BSAS0I#K0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24256BSAS0I#K0 requirements.
6.How does Aetrix verify that R1EX24256BSAS0I#K0 is sourced from the original manufacturer or authorized distributors?
All R1EX24256BSAS0I#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 R1EX24256BSAS0I#K0 meets industry standards.
7.What is the process for return or replacement of R1EX24256BSAS0I#K0?
All R1EX24256BSAS0I#K0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24256BSAS0I#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 R1EX24256BSAS0I#K0 part is unused and in its original packaging.
Return procedure for R1EX24256BSAS0I#K0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R1EX24256BSAS0I#K0 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
