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Renesas RM25C128A-BSNC-B
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- Part No.:
- RM25C128A-BSNC-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
RM25C128A-BSNC-B.pdf
- Description:
- IC CBRAM 128KBIT SPI 5MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,348
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Product details
Overview
RM25C128A-BSNC-B from Adesto Technologies is a 128Kbit CBRAM-based serial EEPROM-compatible boot memory IC with SPI interface, operating from 2.7V to 3.6V, supporting 5MHz fast read and 64-byte page write in ≤1ms, used for firmware storage and configuration retention in microcontroller-based embedded systems.
For engineers reviewing the RM25C128A-BSNC-B datasheet, RM25C128A-BSNC-B pinout, RM25C128A-BSNC-B application, or RM25C128A-BSNC-B equivalent, this page delivers verified electrical specs, SPI timing constraints, package dimensions, endurance (100k cycles), data retention (10 years at 70°C), and real-world boot memory integration guidance.
Technical Context
The RM25C128A-BSNC-B implements a 4-wire SPI interface (CS, SCK, SDI, SDO) with support for Mode 0 and Mode 3 clock polarity, enabling interoperability with standard microcontroller SPI masters. It uses conductive-bridge RAM (CBRAM) technology instead of floating-gate EEPROM, delivering lower write energy and faster byte-write (25µs) versus legacy EEPROM.
Internal architecture includes a 128Kb non-volatile memory array organized in 256 pages of 64 bytes each, a status register with WIP/WEL flags, and hardware-assisted self-timed erase/write cycles. The device features HOLD and WP pins for bus arbitration and software write protection, with power-down current as low as 5µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 128 Kbit (16 KB), sufficient for bootloader code and critical configuration data in resource-constrained MCUs |
| Supply voltage | 2.7V–3.6V - compatible with 3.3V I/O domains without level shifting |
| Max clock frequency | 5 MHz (fast read mode) - enables high-throughput firmware loading during boot |
| Page size & write time | 64 bytes; page write completes in ≤3 ms - allows efficient bulk parameter updates without excessive latency |
| Endurance | 100,000 write/erase cycles - supports field-upgradable firmware and logging in industrial controllers |
| Data retention | 10 years at 70°C - meets long-life requirements for medical, industrial, and infrastructure equipment |
| Power-down current | 5 µA - enables ultra-low-power sleep modes in battery-backed or energy-harvesting systems |
Pinout & Package
RM25C128A-BSNC-B is housed in an 8-lead JEDEC SOIC (SN) package, 0.150" wide body, RoHS-compliant and halogen-free, with 1.27 mm pitch and gull-wing leads. Dimensions: 5.05 mm × 3.99 mm × 1.75 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-low enable; drives device into standby (100 µA) when high; required to initiate all commands |
| SDO (Pin 2) | Serial Data Output | Tri-state output; delivers read data on SCK falling edge; high-impedance when CS high |
| WP (Pin 3) | Write Protect | Hardware lock; disables write/erase when pulled low - independent of WREN/WEL status |
| GND (Pin 4) | Ground Reference | Primary return path for VCC and I/O signals; must be low-impedance for stable SPI timing |
| SDI (Pin 5) | Serial Data Input | Accepts opcodes, addresses, and data on SCK rising edge; latched synchronously to master clock |
| SCK (Pin 6) | Serial Clock | Master-generated clock; defines timing for all SPI transfers; supports 0–5 MHz with <1 µs rise/fall times |
| HOLD (Pin 7) | Bus Hold | Pauses ongoing SPI transaction without resetting state - useful for interrupt-driven MCU contexts |
| VCC (Pin 8) | Power Supply | 2.7–3.6V input; requires local 100 nF decoupling; VCC inhibit threshold is 2.4V for reliable power-up detection |
Key Features
| Feature | Design Value |
|---|---|
| CBRAM non-volatile technology | Delivers 10× lower write energy vs. EEPROM - reduces system-level power budget during firmware updates |
| Fast Read (5 MHz) | Enables sub-32 ms full-memory read - accelerates boot-time integrity checks and configuration loading |
| Self-timed page erase/write | Eliminates need for external timing control or polling overhead - simplifies driver implementation in bare-metal or RTOS environments |
| Dual SPI modes (0 and 3) | Ensures compatibility with diverse MCU SPI peripherals - no hardware redesign needed when switching platforms |
| Hardware write protection (WP pin) | Provides fail-safe, always-on protection against accidental writes during power transients or firmware bugs |
| Power-down mode (5 µA) | Extends battery life in portable diagnostics tools and sensor nodes where memory remains idle >99% of runtime |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing boot firmware and calibration tables in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic startup sequence and secure parameter persistence across power cycles. Use Value: 10-year data retention and 100k-cycle endurance ensure reliable operation over 10+ year product lifecycles without field replacement. |
Use Scenario: Holding device-specific calibration coefficients, user preferences, and regulatory audit logs in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: SPI-accessible configuration memory with hardware write protection (WP) to prevent unauthorized or accidental modification of safety-critical settings. Use Value: 5 µA power-down current extends battery runtime between charges, while fast-read capability supports responsive UI updates during clinical use. |
| Smart Meter Bootloader Storage | Automotive Body Control Module (BCM) Settings |
|
Use Scenario: Hosting field-upgradable bootloader code in ANSI C12.22-compliant electricity meters exposed to wide temperature swings and EMI-rich substations. IC Role / Device Role / Timing Role: SPI EEPROM replacement with CBRAM technology, enabling robust firmware recovery after brown-out events. Use Value: Page-erase capability allows atomic update of bootloader segments without corrupting active execution code - critical for OTA reliability. |
Use Scenario: Retaining seat position, mirror angle, and lighting profiles in automotive BCMs operating across -40°C to +85°C (derated per spec). IC Role / Device Role / Timing Role: Low-voltage (2.7V min), SPI-compatible memory interfaced directly to 3.3V automotive microcontrollers without level shifters. Use Value: 25 µs byte-write time enables rapid saving of user inputs during vehicle operation, minimizing perceived latency in human-machine interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial boot memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSHN-B | 4 Mbit flash; 3V supply; 70 MHz max read; no fast-read mode; 100k endurance; 20-year retention | Higher density but slower byte-write (50 ms); lacks HOLD pin; requires sector erase before write | Choose for larger firmware images where sequential read speed outweighs write latency and bus arbitration needs |
| M95M04-DRMN6TP/K | 4 Mbit EEPROM; 2.5–5.5V supply; 20 MHz max clock; 1M endurance; 40-year retention; same SOIC-8 package | Higher endurance and voltage range, but 5 ms byte-write; no fast-read mode; higher active current (3 mA) | Prefer for ultra-long-life applications requiring >100k write cycles or wider supply tolerance, accepting higher power and latency |
Compared with AT25DF041A-SSHN-B and M95M04-DRMN6TP/K, the RM25C128A-BSNC-B offers optimal balance of low-energy writes, fast read throughput, and integrated bus control (HOLD/WP), making it ideal for cost-sensitive, power-constrained boot memory designs where 128Kbit capacity suffices.
Availability
RM25C128A-BSNC-B is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, smart meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for RM25C128A-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 low-power, high-reliability non-volatile memory solutions based on CBRAM and other emerging technologies.
The RM25C128A-BSNC-B belongs to Adesto's serial CBRAM memory product line, designed specifically for replacing legacy EEPROM and NOR flash in boot-critical, power-sensitive embedded applications where fast, low-energy writes and robust data retention are mandatory.
FAQ
What is the maximum clock frequency supported by RM25C128A-BSNC-B in fast read mode?
The RM25C128A-BSNC-B supports a maximum SCK clock frequency of 5 MHz in fast read mode, enabling high-speed firmware loading and configuration retrieval. This is confirmed in Section 3.2 AC Operating Characteristics of the datasheet (DS-RM25C128A–065B–1/2015), where fSCKF is specified as 0–5 MHz. Normal read mode operates up to 1.6 MHz.
Does RM25C128A-BSNC-B require external circuitry for write protection?
No - RM25C128A-BSNC-B includes both hardware and software write protection. The WP (Write Protect) pin provides hardware-level disable of all write/erase operations when pulled low, independent of internal status. Additionally, the Write Enable Latch (WEL) bit in the status register enforces software-controlled write gating, requiring explicit WREN instruction before any programming command.
What package type is used for RM25C128A-BSNC-B?
RM25C128A-BSNC-B uses the SN (JEDEC SOIC) package: an 8-lead, 0.150" wide plastic gull-wing small outline IC. Per Section 9.1 and Ordering Information, "BSNC-B" decodes to SN package, commercial temperature grade (0°C to +70°C), tube packaging, and 2.7–3.6V operation. Dimensions comply with JEDEC MS-012, Variation AA.
How many write/erase cycles does RM25C128A-BSNC-B guarantee?
RM25C128A-BSNC-B guarantees 100,000 write/erase cycles, as stated in Section 3.2 AC Operating Characteristics under "Endurance". This applies to both page and chip erase operations. The value reflects CBRAM technology's superior cycling capability compared to traditional EEPROM, supporting frequent field updates in industrial and medical applications.
Can RM25C128A-BSNC-B operate with a 2.5V supply?
No - RM25C128A-BSNC-B has a minimum supply voltage of 2.7V, as specified in Absolute Maximum Ratings (Table 2-1) and DC Operating Characteristics (Section 3.1). Operation below 2.7V is not guaranteed and may result in unreliable reads, failed writes, or undefined status register behavior. The VVCCI (VCC inhibit) threshold is 2.4V, but functional operation requires ≥2.7V.
RM25C128A-BSNC-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- CBRAM®
- Technology:
- CBRAM
- Memory Size:
- 128Kbit
- Memory Organization:
- 64 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
RM25C128A-BSNC-B FAQ
1.How can I place an order for RM25C128A-BSNC-B through Aetrix?
Please submit a Request for Quotation (RFQ) for RM25C128A-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 RM25C128A-BSNC-B reliable?
The price and inventory of RM25C128A-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 RM25C128A-BSNC-B is usually 5 days.
3.What payment methods are accepted for RM25C128A-BSNC-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RM25C128A-BSNC-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RM25C128A-BSNC-B?
RM25C128A-BSNC-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RM25C128A-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 RM25C128A-BSNC-B?
For technical support, including RM25C128A-BSNC-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RM25C128A-BSNC-B requirements.
6.How does Aetrix verify that RM25C128A-BSNC-B is sourced from the original manufacturer or authorized distributors?
All RM25C128A-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 RM25C128A-BSNC-B meets industry standards.
7.What is the process for return or replacement of RM25C128A-BSNC-B?
All RM25C128A-BSNC-B units undergo pre-shipment inspection (PSI). If there is an issue with RM25C128A-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 RM25C128A-BSNC-B part is unused and in its original packaging.
Return procedure for RM25C128A-BSNC-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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