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Microchip Technology AT25640B-MAHL-E
- Part No.:
- AT25640B-MAHL-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25640B-MAHL-E.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,978
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Product details
Overview
AT25640B-MAHL-E from Microchip Technology (formerly Atmel) is a 64Kb SPI Serial EEPROM organized as 8,192 words × 8 bits, operating from 1.8V to 5.5V with 20MHz max clock rate at 5V, 32-byte page write capability, and hardware/software write protection via WP pin and status register - deployed in industrial sensor calibration, medical device configuration storage, and embedded system firmware parameter retention.
For engineers reviewing the AT25640B-MAHL-E datasheet, AT25640B-MAHL-E pinout, AT25640B-MAHL-E application, or AT25640B-MAHL-E equivalent, key selection considerations include its 8-pad UDFN (2.0 × 3.0 mm) package, -40°C to +85°C industrial temperature range, 1,000,000 write endurance, 100-year data retention, and dual-mode SPI compatibility (Modes 0 and 3).
Technical Context
The AT25640B-MAHL-E implements a synchronous slave SPI interface with separate SI (input) and SO (output) pins, requiring CS low to initiate communication and supporting MSB-first transmission of opcodes, addresses, and data. Its internal architecture includes an 8-bit instruction register, address decoder, and status register with nonvolatile BP0/BP1/WE/WPEN bits controlling block protection and write enable state.
Write operations require explicit WREN instruction prior to WRITE or WRSR; self-timed internal write cycles complete in ≤5ms with no external erase needed. The HOLD pin suspends ongoing serial transfers without resetting sequence state, while WP pin - when enabled via WPEN bit - blocks status register writes during low assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64Kb (8,192 × 8-bit words) - supports full configuration storage for mid-complexity microcontrollers without external memory expansion. |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic, 3.3V MCU peripherals, and legacy 5V systems without level shifting. |
| Max Clock Frequency | 20MHz at VCC = 5.0V - delivers up to 2.5MB/s effective serial throughput for rapid parameter loading during boot or field updates. |
| Page Write Size | 32 bytes - minimizes write latency per transaction and reduces wear on adjacent memory locations during partial updates. |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention - ensures reliability across >10-year product lifecycles in unattended industrial deployments. |
| Operating Temperature | -40°C to +85°C - qualified for use in industrial control cabinets, outdoor metering, and factory automation environments. |
| Write Protection | Hardware (WP pin) + software (status register BP0/BP1) - enables flexible, layered security for critical calibration or licensing data. |
Pinout & Package
AT25640B-MAHL-E uses an 8-pad, 2.0 mm × 3.0 mm, 0.50 mm pitch Ultra Thin Dual Flat No-Lead (UDFN) package (package code MA), optimized for space-constrained PCB layouts and automated assembly. Pin 1 is marked by laser etch on top surface; thermal pad is exposed on bottom for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low throughout opcode, address, and data transfer sequences to maintain device selection. |
| SCK | Serial Clock | Input-only master-generated clock; timing defines setup/hold windows for SI/SO; supports Modes 0 and 3 polarity/phase configurations. |
| SI | Serial Data Input | Accepts opcode, address, and write data; ignored unless CS is low and device is write-enabled (WEN=1) or not block-protected. |
| SO | Serial Data Output | Drives read data, status register contents, or high-impedance during non-read states; requires external pull-up for open-drain compatibility. |
| GND | Ground Reference | Primary return path for VCC current and digital I/O; must be low-impedance and decoupled near device for noise immunity. |
| VCC | Power Supply | Single supply input (1.8–5.5V); powers core logic, memory array, and I/O buffers; requires local 0.1µF ceramic decoupling. |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1; tied low to prevent accidental reconfiguration of protection settings in field units. |
| HOLD | Communication Suspend | Pauses active SPI transfer (e.g., during MCU interrupt servicing) without losing byte count or address pointer state. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse host MCUs (e.g., ARM Cortex-M, PIC, MSP430) without protocol translation or glue logic. |
| Block Write Protection | Configurable 0%, 25%, 50%, or 100% memory locking via status register - isolates bootloader, calibration, or security keys from runtime corruption. |
| Self-Timed Write Cycle | No external timing control required; internal state machine manages erase/write/verify - simplifies firmware driver development. |
| Low Standby Current | <0.1 µA at 1.8V - extends battery life in portable medical devices and IoT edge nodes operating in deep-sleep modes. |
| Green Packaging | RoHS-compliant NiPdAu lead finish (H grade) and halogen-free molding compound - meets global environmental compliance mandates. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature, pressure, or flow sensor offset/gain coefficients after factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up and maintenance mode; retains values across 10+ year service intervals. Use Value: Eliminates need for external trimming components or costly re-calibration; supports NIST-traceable calibration logs with timestamped write cycles. |
Use Scenario: Holding patient-specific therapy parameters, device serial numbers, and usage counters in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with hardware write lock for regulatory audit trails and safety-critical settings. Use Value: Enables FDA 21 CFR Part 11 compliance via immutable parameter history and protected calibration zones. |
| Embedded Firmware Parameter Storage | Smart Meter Communication Profile |
Use Scenario: Saving network credentials, update flags, and operational thresholds in industrial gateways and PLC I/O modules. IC Role / Device Role / Timing Role: Persistent settings repository updated only during OTA firmware upgrades or commissioning; survives brown-out events. Use Value: Prevents configuration loss during power interruption; supports zero-touch provisioning with pre-loaded profiles. |
Use Scenario: Storing AMI protocol stacks (DLMS/COSEM), tariff tables, and encryption keys in electricity/water meters with 15+ year field life. IC Role / Device Role / Timing Role: Long-term secure memory for utility-grade data integrity; accessed during meter wake-up and secure boot verification. Use Value: Meets ANSI C12.22 and IEC 62056 requirements for cryptographic key persistence and firmware signature validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DRMN6TP/K | 64Kb SPI EEPROM, 2.5–5.5V operation, 20MHz max, same 8-pin UDFN (2×3mm) package but with dedicated RESET pin and enhanced ESD rating (4kV HBM). | Preferred where system-level reset coordination or higher ESD robustness (e.g., handheld test equipment) is required. | Select M95640-DRMN6TP/K if RESET integration or 4kV HBM tolerance is mandatory; otherwise AT25640B-MAHL-E offers broader voltage range (1.8V support) and lower standby current. |
| BR24G64FJ-3GE2 | 64Kb I²C EEPROM, 1.7–5.5V, 1MHz max, 8-pin SOP package - different interface, slower speed, larger footprint, but supports multi-master arbitration. | Suitable for legacy designs using I²C buses or where pin count allows shared SDA/SCL lines across multiple peripherals. | Choose BR24G64FJ-3GE2 only when I²C infrastructure exists and SPI is unavailable; AT25640B-MAHL-E provides faster access, smaller UDFN footprint, and simpler timing margins. |
Compared with M95640-DRMN6TP/K, AT25640B-MAHL-E supports lower 1.8V operation and consumes less standby current, but lacks RESET functionality; versus BR24G64FJ-3GE2, it delivers 20× faster interface speed and 40% smaller PCB area, though requiring dedicated SPI lines.
Availability
AT25640B-MAHL-E is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration storage, and embedded firmware parameter retention requiring stable component supply across long production lifecycles.
Supply support for AT25640B-MAHL-E 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
Microchip Technology acquired Atmel in 2016 and maintains full product support, qualification, and manufacturing continuity for the AT25xxxB EEPROM family.
The AT25640B-MAHL-E belongs to Microchip's industrial-grade SPI Serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in harsh environments where extended data retention and write endurance are critical.
FAQ
What is the package type and dimensions of AT25640B-MAHL-E?
AT25640B-MAHL-E uses an 8-pad Ultra Thin Dual Flat No-Lead (UDFN) package measuring 2.0 mm × 3.0 mm with 0.50 mm pitch. It features a thermal pad on the bottom and laser-marked Pin 1 identification on the top surface, conforming to JEDEC MO-229 standards for automated placement and reflow soldering.
Does AT25640B-MAHL-E support both SPI Mode 0 and Mode 3?
Yes, AT25640B-MAHL-E supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). The datasheet explicitly confirms compatibility with these two modes, enabling interoperability with a wide range of microcontrollers including legacy 68HC11 derivatives and modern ARM-based SoCs without protocol adaptation.
How does hardware write protection work on AT25640B-MAHL-E?
Hardware write protection on AT25640B-MAHL-E is controlled by the WP pin in conjunction with the WPEN bit in the status register. When WPEN=1 and WP is driven low, all writes to the status register - including BP0/BP1 protection bits - are blocked. This prevents accidental modification of memory protection settings during field operation or power transients.
What is the maximum write cycle time for AT25640B-MAHL-E?
The maximum write cycle time for AT25640B-MAHL-E is 5 ms, applicable across the full 1.8V–5.5V supply range and -40°C to +85°C temperature range. This self-timed internal cycle covers erase, program, and verify operations - no external delay or polling is required beyond checking the RDY bit via RDSR instruction.
Can AT25640B-MAHL-E operate at 1.8V supply voltage?
Yes, AT25640B-MAHL-E is fully specified for operation down to 1.8V, with guaranteed AC timing (e.g., 5MHz max SCK frequency) and DC parameters (e.g., VIH/VIL thresholds, ICC/ISB currents) validated at 1.8V. This enables direct integration into ultra-low-power 1.8V logic domains without level-shifting circuitry.
AT25640B-MAHL-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT25640B-MAHL-E FAQ
1.How can I place an order for AT25640B-MAHL-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25640B-MAHL-E 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 AT25640B-MAHL-E reliable?
The price and inventory of AT25640B-MAHL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25640B-MAHL-E is usually 5 days.
3.What payment methods are accepted for AT25640B-MAHL-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25640B-MAHL-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25640B-MAHL-E?
AT25640B-MAHL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25640B-MAHL-E 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 AT25640B-MAHL-E?
For technical support, including AT25640B-MAHL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25640B-MAHL-E requirements.
6.How does Aetrix verify that AT25640B-MAHL-E is sourced from the original manufacturer or authorized distributors?
All AT25640B-MAHL-E 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 AT25640B-MAHL-E meets industry standards.
7.What is the process for return or replacement of AT25640B-MAHL-E?
All AT25640B-MAHL-E units undergo pre-shipment inspection (PSI). If there is an issue with AT25640B-MAHL-E, 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 AT25640B-MAHL-E part is unused and in its original packaging.
Return procedure for AT25640B-MAHL-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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