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Renesas AT25BCM512B-MAH-T
- Part No.:
- AT25BCM512B-MAH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25BCM512B-MAH-T.pdf
- Description:
- IC FLASH 512KBIT SPI 70MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,648
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Product details
Overview
AT25BCM512B-MAH-T from Adesto Technologies is a 512 Kbit serial flash memory IC with SPI interface, operating at 2.7–3.6 V, supporting 70 MHz read frequency and standard/quad I/O protocols in an 8-pin SOIC package. It delivers nonvolatile storage for firmware boot code in embedded microcontroller systems.
For engineers reviewing the AT25BCM512B-MAH-T datasheet, AT25BCM512B-MAH-T pinout, AT25BCM512B-MAH-T application, or AT25BCM512B-MAH-T equivalent, key selection considerations include voltage range compatibility, SPI timing margins, page erase granularity, deep power-down current, and industrial temperature operation (−40°C to +85°C).
Technical Context
This device implements a standard SPI-compatible command set with byte/page/sector/whole-chip erase functions and supports both standard and fast read modes. It uses NOR-based flash architecture with single-power-supply operation and no external high-voltage programming requirement.
The AT25BCM512B-MAH-T integrates a hardware write-protect pin (WP#) and software-controlled status register protection, enabling secure firmware update sequences. Its 256-byte page size and uniform 4-kbyte sector layout support deterministic erase timing and efficient code partitioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64 Kbytes), organized as 8,192 × 8-bit words - enables full bootloader or parameter storage without external expansion. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with 3.3 V logic rails and tolerant of typical industrial supply ripple. |
| Max Clock Frequency | 70 MHz (fast read) - supports sub-100 ns effective access time for real-time firmware fetch in MCU boot sequences. |
| Erase Granularity | 256-byte pages and 4-kbyte sectors - allows fine-grained firmware patching without full chip erase. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and sensor node applications. |
| Package | 8-pin SOIC (3.9 mm × 4.9 mm, MAH footprint) - surface-mount compatible with standard reflow profiles and legacy PCB layouts. |
| Write Cycle Endurance | 100,000 program/erase cycles per sector - ensures reliable field updates over product lifetime. |
| Data Retention | 20 years at +85°C - maintains configuration and calibration data across extended deployment periods. |
Pinout & Package
8-pin SOIC (MAH: 150 mil width, 1.27 mm pitch) with standard SPI pin assignment and hardware write-protect capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 / CS# | Chip Select Input | Active-low enable for SPI command decoding; must be asserted before clock edge to initiate transaction. |
| 2 / DO (Q) | Data Output | Serial output during read operations; tri-stated when CS# is high or during write/erase cycles. |
| 3 / WP# | Write Protect Input | Hardware lock for status register and sector protection bits; low = protection enabled. |
| 4 / GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance connection to system ground plane. |
| 5 / DI (D) | Data Input | Serial input for commands, addresses, and write data; sampled on rising SCK edge. |
| 6 / SCK | Serial Clock Input | Master-generated clock controlling data transfer timing; max 70 MHz for fast read mode. |
| 7 / HOLD# | Pause Control Input | Halts ongoing serial transfer without deselecting device; enables multi-master arbitration or low-power hold states. |
| 8 / VCC | Power Supply | Primary 2.7–3.6 V supply; requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6 V Supply Operation | Eliminates need for separate 5 V or charge-pump circuitry, reducing BOM count and board space in 3.3 V systems. |
| Hardware Write Protection (WP#) | Prevents accidental writes or erases during power transients or firmware glitches without software overhead. |
| Uniform 4-kbyte Sector Architecture | Enables predictable erase timing and simplifies memory management in RTOS-based bootloaders. |
| Low-Power Deep Sleep Mode | Reduces standby current to ≤1 µA, extending battery life in always-on sensor nodes and IoT endpoints. |
| Industrial Temperature Range (−40°C to +85°C) | Validated operation across full ambient range without derating, suitable for uncontrolled enclosure environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic startup sequence and field-upgradable application code. Use Value: 256-byte page erase enables incremental firmware patches without interrupting machine operation or requiring full reflash downtime. | Use Scenario: Retaining calibrated sensor offsets and device-specific correction coefficients in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, long-term parameter storage with hardware write protection against unintended modification. Use Value: 20-year data retention at +85°C ensures calibration integrity across device service life without periodic recalibration. |
| Smart Meter Bootloader | Automotive Body Control Module |
Use Scenario: Hosting secure bootloader code that validates and loads signed application firmware in utility smart meters. IC Role / Device Role / Timing Role: Trusted execution root-of-trust storage with hardware-enabled write lock for critical boot sectors. Use Value: WP# pin provides tamper-resistant protection independent of MCU firmware state or power sequencing anomalies. | Use Scenario: Storing vehicle-specific configuration maps and diagnostic event logs in body control units operating under hood temperatures. IC Role / Device Role / Timing Role: Industrial-temperature-rated nonvolatile memory interfacing directly with 3.3 V CAN microcontrollers. Use Value: −40°C to +85°C qualification eliminates need for thermal derating or external temperature compensation circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DN512C-MAHF-T | Successor part with 2.3–3.6 V operation, 85 MHz max clock, dual-output read, and ultra-deep power-down mode. | Supports lower-voltage host systems and higher-speed read throughput; adds software reset and 256-byte page erase. | Select when upgrading for extended voltage margin, faster boot times, or enhanced low-power sleep states. |
| W25Q512JVSIQ | 512 Mbit capacity, 1.7–3.6 V supply, quad SPI interface, 133 MHz clock, and 4-byte address mode. | Offers 1024× more density and QSPI support but requires different command set and address handling. | Choose only if migrating to larger firmware images and redesigning SPI driver stack for quad I/O and extended addressing. |
Compared with AT25DN512C-MAHF-T, the AT25BCM512B-MAH-T lacks dual-output read and ultra-deep power-down but retains identical pinout and command compatibility; versus W25Q512JVSIQ, it requires no address-mode changes or driver rewrite but offers lower density and slower throughput.
Availability
AT25BCM512B-MAH-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, smart metering infrastructure, and automotive body electronics requiring stable component supply and long-term obsolescence planning.
Supply support for AT25BCM512B-MAH-T 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 was a fabless semiconductor company specializing in ultra-low-power nonvolatile memory and analog interface solutions before its acquisition by Dialog Semiconductor in 2020.
The AT25BCM512B-MAH-T belongs to Adesto's DataFlash® serial flash family, designed specifically for reliable, low-power, SPI-based code and data storage in resource-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the AT25BCM512B-MAH-T?
The AT25BCM512B-MAH-T supports a maximum clock frequency of 70 MHz in fast read mode. This timing enables efficient firmware loading and parameter access in microcontroller boot sequences. The device maintains timing compliance across its full industrial temperature range (−40°C to +85°C) and supply voltage window (2.7 V to 3.6 V). Exceeding 70 MHz may result in read errors or command timeout failures.
Does the AT25BCM512B-MAH-T support quad SPI interface?
No, the AT25BCM512B-MAH-T does not support quad SPI. It implements standard SPI (single I/O) and fast read modes only, using pins DI (data in), DO (data out), SCK, and CS#. Quad SPI functionality was introduced in later-generation Adesto parts such as the AT25DN512C, which added dual-output read but not full quad I/O. The AT25BCM512B-MAH-T remains compatible with legacy SPI controllers requiring minimal driver changes.
What is the page erase size for the AT25BCM512B-MAH-T?
The AT25BCM512B-MAH-T supports 256-byte page erase as its smallest erasable unit. This granularity allows targeted updates to firmware segments or configuration blocks without disturbing adjacent data. Full chip and 4-kbyte sector erase are also supported. Page erase time is typically 3 ms, enabling rapid field updates in time-sensitive embedded applications where the AT25BCM512B-MAH-T is deployed.
Is the AT25BCM512B-MAH-T still in active production?
No, the AT25BCM512B-MAH-T has been discontinued per Adesto Product Change Notification PSF014 (January 2014). It was superseded by the AT25DN512C-MAHF-T, which is pin-to-pin and functionally backward compatible. Aetrix Electronics maintains limited legacy inventory for design continuity and repair scenarios, but new designs should target the AT25DN512C-MAHF-T or verified alternatives.
What is the purpose of the HOLD# pin on the AT25BCM512B-MAH-T?
The HOLD# pin on the AT25BCM512B-MAH-T pauses ongoing serial communication without deselecting the device. When asserted low during an active SPI transaction, it freezes SCK and I/O states, allowing the host controller to temporarily suspend data transfer - useful for interrupt servicing or multi-master arbitration. The AT25BCM512B-MAH-T resumes operation immediately upon deassertion, preserving internal command state and eliminating reinitialization overhead.
AT25BCM512B-MAH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 70 MHz
- Write Cycle Time - Word, Page:
- 15µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT25BCM512B-MAH-T FAQ
1.How can I place an order for AT25BCM512B-MAH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25BCM512B-MAH-T 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 AT25BCM512B-MAH-T reliable?
The price and inventory of AT25BCM512B-MAH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25BCM512B-MAH-T is usually 5 days.
3.What payment methods are accepted for AT25BCM512B-MAH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25BCM512B-MAH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25BCM512B-MAH-T?
AT25BCM512B-MAH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25BCM512B-MAH-T 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 AT25BCM512B-MAH-T?
For technical support, including AT25BCM512B-MAH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25BCM512B-MAH-T requirements.
6.How does Aetrix verify that AT25BCM512B-MAH-T is sourced from the original manufacturer or authorized distributors?
All AT25BCM512B-MAH-T 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 AT25BCM512B-MAH-T meets industry standards.
7.What is the process for return or replacement of AT25BCM512B-MAH-T?
All AT25BCM512B-MAH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25BCM512B-MAH-T, 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 AT25BCM512B-MAH-T part is unused and in its original packaging.
Return procedure for AT25BCM512B-MAH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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