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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas R1EX24256ASAS0A#S0

Name: R1EX24256ASAS0A#S0
Brand: Renesas
SKU: R1EX24256ASAS0A#S0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: R1EX24256ASAS0A#S0

Manufacturer:: Renesas

Category:: Memory

Package:: -

Datasheet:: R1EX24256ASAS0A#S0.pdf

Description:: EEPROM, 32KX8, SERIAL

Quantity:: RFQ Add To RFQ list

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Inventory:62,500

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Product details

Overview

R1EX24256ASAS0A#S0 from Renesas Electronics is a 256-Kbit (32K × 8) serial EEPROM with I²C-compatible 2-wire interface, 1.7–5.5 V supply voltage, 400 kHz max clock frequency, and write cycle time of 5 ms (typical). It operates in industrial temperature range (−40°C to +85°C) and supports byte/page write and sequential read for embedded system configuration storage.

For engineers reviewing the R1EX24256ASAS0A#S0 datasheet, R1EX24256ASAS0A#S0 pinout, R1EX24256ASAS0A#S0 application, or R1EX24256ASAS0A#S0 equivalent, key selection criteria include I²C address flexibility (three hardware-selectable addresses), endurance of 1,000,000 write cycles, data retention of 100 years, and SOIC-8 package compatibility with legacy board layouts.

Technical Context

This EEPROM implements standard I²C protocol with START/STOP condition detection, ACK/NACK handshaking, and 7-bit slave addressing. It uses internal charge-pump circuitry for high-voltage generation during write operations, eliminating need for external V_PP.

The device integrates write protection via software (WP bit in status register) and hardware (external WP pin), supports page write up to 64 bytes per cycle, and features built-in write-cycle timing control with automatic end-of-write detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	256 Kbit (32 K × 8), sufficient for firmware parameter tables or calibration data sets
Interface	I²C-compatible 2-wire bus, enables shared bus topology with multiple peripherals
Supply Voltage	1.7–5.5 V, supports direct connection to 1.8 V, 3.3 V, or 5 V microcontroller I/O domains
Write Cycle Time	5 ms typical, defines minimum interval between successive write commands
Endurance	1,000,000 write cycles, ensures long-term reliability in logging or counter applications
Data Retention	100 years at +25°C, guarantees nonvolatile storage integrity over product lifetime
Operating Temp	−40°C to +85°C, qualified for industrial-grade embedded deployment

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), 150 mil width, JEDEC MS-012AC compliant, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
A0, A1, A2	Address Input	Hardware-selectable bits for I²C slave address (0x50–0x57); enable up to eight devices on same bus
SDA	Serial Data	Open-drain bidirectional I²C data line; requires external pull-up resistor
SCL	Serial Clock	Input-only I²C clock line; synchronizes all data transfers
WP	Write Protect	Active-low hardware lock; when tied HIGH, disables all write operations including status register
V_CC	Power Supply	Primary power input; powers internal logic and charge pump
V_SS	Ground	Reference return path for all internal circuits and I/O signals

Key Features

Feature	Design Value
Flexible I²C Addressing	Three hardware pins (A0–A2) configure one of eight unique 7-bit slave addresses, enabling multi-device bus expansion without software remapping
Page Write Capability	64-byte page buffer allows burst writes within single I²C transaction, reducing bus overhead and improving update efficiency
Dual Write Protection	Combines hardware (WP pin) and software (WEL bit + WP bit) locking for layered security against accidental or malicious overwrites
Low-Voltage Operation	1.7 V minimum V_CC enables use in battery-powered or energy-harvesting systems where supply headroom is constrained

Applications

Industrial Sensor Calibration	Smart Meter Firmware Storage
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and temperature compensation tables in pressure or flow transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-up initialization and field recalibration routines. Use Value: Enables traceable, field-updatable calibration without requiring MCU code changes or external programming equipment.	Use Scenario: Holding tariff schedules, billing history metadata, and communication module firmware patches in electricity/water meters. IC Role / Device Role / Timing Role: Secure, wear-leveling–independent storage for infrequently updated but mission-critical operational data. Use Value: Meets IEC 62056 compliance requirements for data integrity and 100-year retention under meter operating conditions.
Medical Device Configuration	Automotive Body Control Module
Use Scenario: Saving user preferences (e.g., display brightness, alarm thresholds) and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: I²C-connected persistent memory supporting FDA 21 CFR Part 11 electronic record requirements. Use Value: Provides deterministic write timing and hardware write lock to prevent unauthorized configuration tampering.	Use Scenario: Storing seat position presets, mirror angle maps, and lighting profile settings in vehicle door modules. IC Role / Device Role / Timing Role: Low-power, vibration-resistant nonvolatile memory interfaced directly to 3.3 V automotive microcontrollers. Use Value: SOIC-8 package withstands thermal cycling in cabin environments; 1.7 V operation supports stop-start battery voltage sag.

Industrial Sensor Calibration

Smart Meter Firmware Storage

Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and temperature compensation tables in pressure or flow transmitters.

IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-up initialization and field recalibration routines.

Use Value: Enables traceable, field-updatable calibration without requiring MCU code changes or external programming equipment.

Use Scenario: Holding tariff schedules, billing history metadata, and communication module firmware patches in electricity/water meters.

IC Role / Device Role / Timing Role: Secure, wear-leveling–independent storage for infrequently updated but mission-critical operational data.

Use Value: Meets IEC 62056 compliance requirements for data integrity and 100-year retention under meter operating conditions.

Medical Device Configuration

Automotive Body Control Module

Use Scenario: Saving user preferences (e.g., display brightness, alarm thresholds) and regulatory audit logs in portable diagnostic equipment.

IC Role / Device Role / Timing Role: I²C-connected persistent memory supporting FDA 21 CFR Part 11 electronic record requirements.

Use Value: Provides deterministic write timing and hardware write lock to prevent unauthorized configuration tampering.

Use Scenario: Storing seat position presets, mirror angle maps, and lighting profile settings in vehicle door modules.

IC Role / Device Role / Timing Role: Low-power, vibration-resistant nonvolatile memory interfaced directly to 3.3 V automotive microcontrollers.

Use Value: SOIC-8 package withstands thermal cycling in cabin environments; 1.7 V operation supports stop-start battery voltage sag.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C256B-PU	Same 256 Kbit size and I²C interface, but rated only to +70°C and lacks hardware address pins A1/A2 (A0 only)	Limited to commercial-temperature consumer electronics; no multi-device bus support without address remapping	Select if ambient temperature stays below +70°C and only one EEPROM is needed per bus
M95256-DWDW	Identical 256 Kbit capacity and SOIC-8 package, but SPI interface instead of I²C; 5 MHz max clock vs. 400 kHz	Requires SPI-capable MCU GPIO; faster write throughput but incompatible bus protocol	Choose when existing design uses SPI peripherals and higher-speed updates are prioritized over bus sharing

Compared with AT24C256B-PU and M95256-DWDW, the R1EX24256ASAS0A#S0 offers broader temperature qualification, full three-bit hardware addressing, and native I²C compatibility-making it optimal for industrial multi-node systems where bus scalability and environmental robustness are critical.

Availability

R1EX24256ASAS0A#S0 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and medical device configuration requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for R1EX24256ASAS0A#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 automotive, industrial, and IoT markets.

The R1EX24xxx series targets high-reliability serial EEPROM applications demanding extended temperature operation, robust write protection, and seamless I²C integration into resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by R1EX24256ASAS0A#S0?

The R1EX24256ASAS0A#S0 supports a maximum I²C clock frequency of 400 kHz under standard-mode operation. This aligns with common microcontroller I²C peripherals and ensures reliable communication across varying bus capacitance and pull-up configurations. The R1EX24256ASAS0A#S0 maintains timing compliance across its full −40°C to +85°C operating range without derating.

Does R1EX24256ASAS0A#S0 require an external high-voltage supply for write operations?

No, the R1EX24256ASAS0A#S0 integrates an internal charge-pump circuit that generates the required programming voltage from the standard V_CC supply (1.7–5.5 V). This eliminates the need for external V_PP pins or dedicated high-voltage sources, simplifying board design and reducing BOM count. The R1EX24256ASAS0A#S0 performs all write cycles autonomously once initiated via I²C.

How many unique I²C addresses can be configured on R1EX24256ASAS0A#S0?

The R1EX24256ASAS0A#S0 provides three hardware address pins (A0, A1, A2), allowing configuration of eight distinct 7-bit I²C slave addresses ranging from 0x50 to 0x57. This enables up to eight R1EX24256ASAS0A#S0 devices-or combinations with other I²C peripherals-to share a single bus without address conflict, supporting scalable system architectures.

What write protection mechanisms does R1EX24256ASAS0A#S0 implement?

The R1EX24256ASAS0A#S0 implements dual-layer write protection: hardware-based via the active-low WP pin (when HIGH, all writes are blocked), and software-based using the Write Enable Latch (WEL) bit and Write Protect (WP) bit in the status register. This combination prevents accidental writes during power transitions and enforces intentional, authenticated updates. The R1EX24256ASAS0A#S0 retains protection state across power cycles.

Is R1EX24256ASAS0A#S0 compatible with 1.8 V microcontrollers?

Yes, the R1EX24256ASAS0A#S0 operates down to 1.7 V V_CC, making it fully compatible with 1.8 V logic systems. Its I²C interface meets standard open-drain voltage thresholds, and SDA/SCL pins tolerate 1.8 V signal levels without level shifting. The R1EX24256ASAS0A#S0 maintains full functionality-including 400 kHz clock rate and 5 ms write timing-at 1.8 V, supporting low-power edge-node designs.

R1EX24256ASAS0A#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:: -

R1EX24256ASAS0A#S0 FAQ

1.How can I place an order for R1EX24256ASAS0A#S0 through Aetrix?

Please submit a Request for Quotation (RFQ) for R1EX24256ASAS0A#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 R1EX24256ASAS0A#S0 reliable?

The price and inventory of R1EX24256ASAS0A#S0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R1EX24256ASAS0A#S0 is usually 5 days.

3.What payment methods are accepted for R1EX24256ASAS0A#S0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R1EX24256ASAS0A#S0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for R1EX24256ASAS0A#S0?

R1EX24256ASAS0A#S0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your R1EX24256ASAS0A#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 R1EX24256ASAS0A#S0?

For technical support, including R1EX24256ASAS0A#S0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R1EX24256ASAS0A#S0 requirements.

6.How does Aetrix verify that R1EX24256ASAS0A#S0 is sourced from the original manufacturer or authorized distributors?

All R1EX24256ASAS0A#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 R1EX24256ASAS0A#S0 meets industry standards.

7.What is the process for return or replacement of R1EX24256ASAS0A#S0?

All R1EX24256ASAS0A#S0 units undergo pre-shipment inspection (PSI). If there is an issue with R1EX24256ASAS0A#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 R1EX24256ASAS0A#S0 part is unused and in its original packaging.

Return procedure for R1EX24256ASAS0A#S0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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