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Renesas RM25C32C-BSNC-B
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- Part No.:
- RM25C32C-BSNC-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RM25C32C-BSNC-B.pdf
- Description:
- IC CBRAM 32KBIT SPI 5MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
RM25C32C-BSNC-B from Adesto Technologies is a 32Kbit EEPROM-compatible serial non-volatile memory IC based on CBRAM® resistive technology, operating from 2.7V to 3.6V, supporting SPI modes 0 and 3, with 5MHz fast read capability and 32-byte page write in ≤1ms. It serves as a low-power, high-endurance replacement for legacy EEPROM in microcontroller boot code storage and sensor calibration data retention.
For engineers reviewing the RM25C32C-BSNC-B datasheet, RM25C32C-BSNC-B pinout, RM25C32C-BSNC-B application, or RM25C32C-BSNC-B equivalent, this page delivers verified electrical specs, SPI timing constraints, endurance/reliability metrics, package dimensions, and real-world use-case implementation guidance - all grounded in the official DS-RM25C32C–063F–1/2018 datasheet.
Technical Context
The RM25C32C-BSNC-B implements a 4-wire SPI interface (CS, SDO, SDI, SCK) with dual-mode clock polarity support (SPI mode 0 and mode 3), enabling interoperability with diverse microcontrollers without hardware reconfiguration. Its CBRAM® core enables direct-write operation with no pre-erase requirement and eliminates charge-pump circuitry.
It features a single 8-bit status register (WIP/WEL bits), supports byte/page/chip erase, and includes dedicated HOLD and WP pins for bus arbitration and hardware write protection. All write/erase cycles are self-timed, and power-down current is specified at 5µA - critical for battery-powered IoT endpoints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32Kbit (4KB), organized as 1024 × 32-byte pages - matches standard EEPROM addressing for drop-in firmware compatibility. |
| Supply Voltage | 2.7V–3.6V - compatible with 3.3V logic systems and tolerant of brown-out conditions down to 2.4V (VVCCI). |
| Read Speed | Up to 5MHz (fast read mode) - reduces firmware boot time by >3× vs. 1.6MHz normal read; requires CL = 10pF load. |
| Write Performance | Byte write ≤100µs, page write ≤3ms - enables rapid logging of timestamped sensor events without CPU blocking. |
| Endurance & Retention | 25,000 write cycles, 10-year data retention at 70°C - validated per JEDEC JESD22-A117B for industrial temperature grade. |
| Power Consumption | 1.5mA active write, 1mA active read, 5µA power-down - supports multi-year operation on coin-cell batteries. |
| Interface Protocol | SPI modes 0 and 3 only - ensures deterministic timing with rising-edge input capture and falling-edge output valid windows. |
Pinout & Package
RM25C32C-BSNC-B is supplied in an 8-lead JEDEC SOIC (SN) package, 0.150" wide body (5.0mm × 3.9mm footprint), gull-wing lead form, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-low enable; drives device into standby (100µA) when high; required to initiate all commands. |
| 2 - SDO | Serial Data Output | Tri-state open-drain output; data valid on SCK falling edge; high-impedance when CS high or HOLD active. |
| 3 - WP | Write Protect | Hardware lock: when tied low, prevents WR, PERS, CERS, and WREN instructions - independent of status register. |
| 4 - GND | Ground Reference | Primary return path for VCC current and signal references; must be low-impedance for stable SPI timing. |
| 5 - SDI | Serial Data Input | CMOS input; latches command/address/data on SCK rising edge; accepts MSB-first 8-bit opcodes and addresses. |
| 6 - SCK | Serial Clock | Master-generated clock; defines SPI timing windows; polarity fixed per selected mode (0 or 3); max 5MHz in fast read. |
| 7 - HOLD | Communication Hold | Pauses ongoing SPI transfer without resetting internal state; allows master to service higher-priority interrupts. |
| 8 - VCC | Power Supply | 2.7V–3.6V input; requires local 100nF ceramic decoupling within 5mm of pin; tPUD = 75µs after VCC rise. |
Key Features
| Feature | Design Value |
|---|---|
| CBRAM® Technology | Resistive switching memory eliminates charge pumps and erase-before-write - reduces system power and simplifies firmware. |
| Energy-Efficient Writes | Byte write consumes only 10% of the energy required by comparable EEPROM - extends battery life in portable sensors. |
| Dual SPI Mode Support | Native compatibility with both SPI mode 0 (CPOL=0, CPHA=0) and mode 3 (CPOL=1, CPHA=1) - avoids level-shifter or GPIO remapping. |
| Hardware Write Protection | WP pin provides unconditional, non-volatile lock against accidental writes - active even during power transitions. |
| Unlimited Read Cycles | No wear-out mechanism during read operations - enables continuous telemetry polling without memory degradation. |
Applications
| Industrial Sensor Node | Medical Wearable Calibration |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for MEMS accelerometers in predictive maintenance gateways. IC Role / Device Role / Timing Role: Non-volatile configuration store accessed at boot and during field recalibration; SPI interface synchronized to MCU's APB clock domain. Use Value: 25,000 write cycles support lifetime recalibration; 5µA power-down current enables >5-year shelf life before deployment. |
Use Scenario: Retaining patient-specific sensor calibration and usage history in FDA-cleared ECG patches. IC Role / Device Role / Timing Role: Secure, tamper-resistant data log; WP pin hardwired to prevent unauthorized overwrite during clinical use. Use Value: 10-year data retention meets medical device archival requirements; RoHS/halogen-free packaging satisfies IEC 60601-1 biocompatibility mandates. |
| Smart Meter Firmware Storage | Automotive Body Control Module |
|
Use Scenario: Holding bootloader code and tariff tables in electricity meters subject to frequent firmware updates over PLC. IC Role / Device Role / Timing Role: SPI slave holding executable image; fast read mode (5MHz) minimizes boot latency after power restoration. Use Value: Page erase capability enables atomic firmware updates; 32-byte page size aligns with common flash sector boundaries. |
Use Scenario: Storing seat position memory, mirror presets, and lighting profiles in 12V automotive BCMs. IC Role / Device Role / Timing Role: Low-voltage serial NV memory interfaced to 3.3V CAN microcontroller; operates across 0°C–70°C ambient range. Use Value: 2.7V minimum VCC supports cold-cranking voltage dips; HOLD pin enables safe interrupt handling during LIN bus arbitration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial non-volatile memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | Quad SPI NOR Flash (4Mbit), 3V supply, 85MHz DTR read, no built-in write protection pin. | Higher density but requires external erase management; lacks WP/HOLD pins - needs firmware-level lock. | Select when >4KB storage needed and system supports QSPI controllers; avoid if hardware write lock is mandatory. |
| MB85RS32B-DSK-ERE1 | F-RAM (32Kbit), 2.7–3.6V, 20MHz SPI, unlimited endurance, no write delay. | Zero write latency and infinite endurance, but higher cost and larger footprint (8-pin TSSOP only). | Select for ultra-high-write-frequency logging (e.g., 1kHz sensor sampling); RM25C32C-BSNC-B remains optimal for cost-sensitive, moderate-write applications. |
Compared with AT25DF041A-SSH-T and MB85RS32B-DSK-ERE1, RM25C32C-BSNC-B uniquely balances EEPROM compatibility, hardware write protection, sub-1ms page write, and SOIC package availability - making it the preferred choice for retrofitting legacy designs requiring minimal layout change.
Availability
RM25C32C-BSNC-B is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, smart metering, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for RM25C32C-BSNC-B 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
Adesto Technologies (acquired by Dialog Semiconductor in 2020, now part of Renesas Electronics) specialized in ultra-low-power, high-reliability non-volatile memory solutions for IoT and industrial edge devices.
The RM25C32C-BSNC-B belongs to Adesto's Mavriq™ CBRAM® product line, engineered specifically for applications demanding EEPROM compatibility with superior write speed, lower energy consumption, and extended temperature reliability - not general-purpose flash or FRAM.
FAQ
What is the maximum clock frequency supported by RM25C32C-BSNC-B in fast read mode?
The RM25C32C-BSNC-B supports up to 5MHz SCK frequency in fast read mode, as confirmed in Section 3.2 AC Operating Characteristics of DS-RM25C32C–063F–1/2018. This requires CL = 10pF load and VCC ≥ 2.7V. Normal read mode is limited to 1.6MHz. The RM25C32C-BSNC-B achieves this via optimized CBRAM® access timing and reduced internal latency versus traditional EEPROM.
Does RM25C32C-BSNC-B require a pre-erase step before writing new data?
No, RM25C32C-BSNC-B does not require pre-erase due to its CBRAM® technology - it is a direct-write memory. Unlike EEPROM or flash, each byte can be overwritten independently without erasing the entire page or sector first. This behavior is explicitly stated in Section 3.2 footnote 2 and confirmed in the WRITE instruction description (Section 8.6) of the RM25C32C-BSNC-B datasheet.
What is the function of the WP pin on RM25C32C-BSNC-B, and is it active-high or active-low?
The WP (Write Protect) pin on RM25C32C-BSNC-B is active-low and provides hardware-level inhibition of all write/erase commands (WR, PERS, CERS, WREN), regardless of the status of the Write Enable Latch. As documented in Table 5-1 and Section 8.2, WP overrides software controls - ensuring robust protection during power-up transients or firmware faults. RM25C32C-BSNC-B maintains this behavior across all operating voltages and temperatures.
Can RM25C32C-BSNC-B operate reliably at 2.5V supply voltage?
No, RM25C32C-BSNC-B is not rated for 2.5V operation. Its absolute minimum supply is 2.7V (VCC min), with VVCCI = 2.4V specifying the inhibit threshold below which the device enters reset. Operation below 2.7V violates the recommended operating range in Section 3.1 and may result in undefined behavior, failed writes, or data corruption. RM25C32C-BSNC-B must be powered within 2.7V–3.6V for guaranteed functionality.
How many write cycles can RM25C32C-BSNC-B endure, and is this per byte or per page?
RM25C32C-BSNC-B guarantees 25,000 write cycles per memory location (byte address), as defined in Section 3.2 and validated per JEDEC JESD22-A117B. This endurance applies individually to each of the 4,096 addressable bytes - not averaged across pages or the full array. Endurance is unaffected by page write size; writing 1 byte or 32 bytes to the same page consumes one cycle per written byte. RM25C32C-BSNC-B does not degrade uniformly across the array.
RM25C32C-BSNC-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Mavriq™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- CBRAM®
- Technology:
- CBRAM
- Memory Size:
- 32Kbit
- Memory Organization:
- 32 Bytes Page Size
- Memory Interface:
- SPI
- Clock Frequency:
- 5 MHz
- Write Cycle Time - Word, Page:
- 100µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
RM25C32C-BSNC-B FAQ
1.How can I place an order for RM25C32C-BSNC-B through Aetrix?
Please submit a Request for Quotation (RFQ) for RM25C32C-BSNC-B 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 RM25C32C-BSNC-B reliable?
The price and inventory of RM25C32C-BSNC-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RM25C32C-BSNC-B is usually 5 days.
3.What payment methods are accepted for RM25C32C-BSNC-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RM25C32C-BSNC-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RM25C32C-BSNC-B?
RM25C32C-BSNC-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RM25C32C-BSNC-B 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 RM25C32C-BSNC-B?
For technical support, including RM25C32C-BSNC-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RM25C32C-BSNC-B requirements.
6.How does Aetrix verify that RM25C32C-BSNC-B is sourced from the original manufacturer or authorized distributors?
All RM25C32C-BSNC-B 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 RM25C32C-BSNC-B meets industry standards.
7.What is the process for return or replacement of RM25C32C-BSNC-B?
All RM25C32C-BSNC-B units undergo pre-shipment inspection (PSI). If there is an issue with RM25C32C-BSNC-B, 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 RM25C32C-BSNC-B part is unused and in its original packaging.
Return procedure for RM25C32C-BSNC-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RM25C32C-BSNC-B Tags
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