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Microchip Technology AT25320B-MAHL-E
- Part No.:
- AT25320B-MAHL-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25320B-MAHL-E.pdf
- Description:
- IC EEPROM 32KBIT SPI 20MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:29,343
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Product details
Overview
AT25320B-MAHL-E from Microchip Technology (formerly Atmel) is a 32-kbit SPI serial EEPROM organized as 4,096 × 8-bit memory array, supporting 1.8V–5.5V operation, 20 MHz clock rate at 5V, 32-byte page write mode, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial sensor nodes, power supply monitors, and embedded control modules requiring low-power, high-reliability data retention.
For engineers reviewing the AT25320B-MAHL-E datasheet, AT25320B-MAHL-E pinout, AT25320B-MAHL-E application, or AT25320B-MAHL-E equivalent, key selection criteria include SPI Mode 0/3 compatibility, 100-year data retention, 1M write endurance, -40°C to +85°C industrial temperature range, and UDFN-8 (2.0 × 3.0 mm) package with NiPdAu lead finish.
Technical Context
The AT25320B-MAHL-E operates as a slave device on a 3-wire SPI bus (CS, SCK, SI/SO), with dedicated HOLD and WP pins enabling suspend-on-demand and hardware-level block protection. Its status register controls BP0/BP1 bits for 1/4, 1/2, or full-array write protection and WPEN bit to enable/disable WP pin functionality.
Internally, it features self-timed 5 ms max write cycles, no erase-before-write requirement, automatic address increment during read/write sequences, and high-impedance SO output when deselected. All instructions-including WREN, WRITE, RDSR, and WRSR-are MSB-first and initiated by CS falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32,768 bits (4,096 × 8), sufficient for firmware calibration tables or device ID storage |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interface with 1.8V logic, 3.3V microcontrollers, and 5V legacy systems |
| Max Clock Frequency | 20 MHz at 5V - enables fast configuration loading in time-critical boot sequences |
| Write Endurance | 1,000,000 cycles - ensures reliable logging in field-upgradeable industrial controllers |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of calibration constants and security keys |
| Operating Temperature | -40°C to +85°C - qualified for deployment in uncontrolled industrial enclosures and outdoor equipment |
| Page Write Size | 32 bytes - balances programming speed and granularity for partial updates without full-array overwrite |
Pinout & Package
AT25320B-MAHL-E is packaged in an 8-pad UDFN (2.0 mm × 3.0 mm, 0.5 mm pitch) with NiPdAu lead finish and industrial-grade thermal performance. Pin 1 is laser-marked 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 low to accept commands; high-impedance SO when high |
| SCK | Serial Clock | Input-only synchronous timing reference - defines SPI sampling edges per Mode 0/3 |
| SI | Serial Data Input | MOSI input - receives opcodes, addresses, and write data MSB-first |
| SO | Serial Data Output | MISO output - drives read data and status register contents; tri-states when CS high or HOLD active |
| GND | Ground Reference | Return path for all digital I/O and internal circuitry - requires low-impedance PCB connection |
| VCC | Power Supply | Single-supply input - powers core logic, memory array, and I/O buffers across full 1.8–5.5 V range |
| WP | Write Protect | Hardware lock - disables status register writes when WPEN=1 and WP=low; configurable via WRSR |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence - allows host MCU to service interrupts mid-transaction |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 support | Interoperates with diverse MCUs including 68HC11, ARM Cortex-M, and PIC families without protocol translation |
| Block Write Protection (BP0/BP1) | Configurable 0%, 25%, 50%, or 100% memory locking - prevents accidental overwrites of critical calibration sectors |
| Self-timed 5 ms write cycle | Eliminates external timing control - simplifies firmware design and reduces host CPU overhead during writes |
| 1.8V–5.5V wide supply range | Enables single-part sourcing across 1.8V IoT sensors, 3.3V industrial PLCs, and 5V legacy instrumentation |
| Green RoHS-compliant packaging | UDFN-8 with NiPdAu finish meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard reflow |
Applications
| Industrial Sensor Calibration | Power Supply Configuration |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in factory automation systems. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization and field recalibration routines. Use Value: Enables plug-and-play sensor replacement with zero manual setup; retains accuracy across 100-year lifetime without battery backup. |
Use Scenario: Holding programmable voltage/current limits, soft-start profiles, and fault recovery settings in digitally controlled DC-DC modules. IC Role / Device Role / Timing Role: Configuration memory mapped via SPI during system boot and dynamically updated during adaptive load management. Use Value: Supports field firmware updates to power policies without hardware redesign; withstands >1M reprogramming cycles during validation. |
| Embedded Controller Bootloader Settings | Medical Device Usage Logs |
Use Scenario: Storing secure boot flags, firmware version hashes, and cryptographic key indices in medical imaging subsystems. IC Role / Device Role / Timing Role: Trusted configuration vault accessed only after hardware root-of-trust verification completes. Use Value: Prevents unauthorized firmware execution via hardware-enforced write protection (WP pin + BP bits); meets IEC 62304 Class C requirements. |
Use Scenario: Recording operational timestamps, error codes, and maintenance intervals in portable diagnostic devices. IC Role / Device Role / Timing Role: Wear-leveling–free sequential log buffer written during normal operation and queried via USB host. Use Value: Guarantees 100-year retention of audit trails required for FDA 21 CFR Part 11 compliance; operates reliably at 1.8V from coin-cell backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-DRMN6TP/K | 32Kb SPI EEPROM, 2.5–5.5V supply, 20 MHz max, SOIC-8 package (5.0 × 4.0 mm) | Larger footprint; lacks HOLD pin and UDFN thermal performance | Select when board layout prioritizes through-hole/SOIC compatibility over space-constrained designs |
| BR24G32FJ-3GE2 | 32Kb I²C EEPROM, 1.7–5.5V, 1 MHz max, XDFN-8 (2.0 × 2.5 mm), built-in write-cycle timer | I²C interface instead of SPI; slower clock; no HOLD/WP hardware control | Select when system already uses I²C bus and SPI resources are constrained; verify timing margins for 1 MHz writes |
Compared with M95320-DRMN6TP/K and BR24G32FJ-3GE2, AT25320B-MAHL-E offers superior space efficiency (UDFN-8), dual SPI mode flexibility, and dedicated HOLD functionality-critical for real-time interrupt handling in deterministic embedded systems.
Availability
AT25320B-MAHL-E is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded controller bootloader settings requiring stable component supply across extended product lifecycles.
Supply support for AT25320B-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 technical and manufacturing continuity for the AT25xxx SPI EEPROM family.
The AT25320B series was designed specifically for robust, low-voltage nonvolatile storage in space-constrained industrial and commercial systems where reliability, wide voltage operation, and SPI interoperability are mandatory.
FAQ
What is the maximum clock frequency supported by AT25320B-MAHL-E?
The AT25320B-MAHL-E supports up to 20 MHz SCK frequency at VCC = 5.0 V, 10 MHz at 2.5–5.5 V, and 5 MHz at 1.8–5.5 V. These values are specified in Table 4-3 of the datasheet and reflect guaranteed AC timing under load conditions (CL = 30 pF). The device remains functional beyond these limits but timing margins may degrade.
Does AT25320B-MAHL-E require an external erase cycle before writing?
No, AT25320B-MAHL-E does not require a separate erase cycle. Each byte or page write automatically erases and reprograms the target location. This eliminates firmware complexity associated with sector erasure and enables true byte-level random writes within protected boundaries defined by the status register.
How is write protection implemented on AT25320B-MAHL-E?
AT25320B-MAHL-E implements dual-layer write protection: hardware-based via the WP pin (when WPEN=1 and WP=low), and software-configurable via BP0/BP1 bits in the status register. These bits define four protection levels - none, lower 1/4, lower 1/2, or entire array - and are nonvolatile with 1M endurance like main memory.
What package type is used for AT25320B-MAHL-E?
AT25320B-MAHL-E uses an 8-pad UDFN package (2.0 mm × 3.0 mm body, 0.5 mm pitch), designated as "MA" in Atmel's ordering code. It features a thermally enhanced construction with exposed thermal pad, NiPdAu lead finish, and JEDEC MO-229 compliant dimensions - optimized for high-density PCB layouts and automated reflow assembly.
Can AT25320B-MAHL-E operate at 1.8V supply voltage?
Yes, AT25320B-MAHL-E is fully specified for 1.8V operation across all functions: read, write, status register access, and HOLD/WP pin behavior. DC characteristics (e.g., ISB1 < 0.1 μA standby current) and AC timing (5 MHz max SCK) are validated at 1.8V, making it suitable for ultra-low-power battery-backed applications.
AT25320B-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:
- 32Kbit
- Memory Organization:
- 4K 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)
AT25320B-MAHL-E FAQ
1.How can I place an order for AT25320B-MAHL-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320B-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 AT25320B-MAHL-E reliable?
The price and inventory of AT25320B-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 AT25320B-MAHL-E is usually 5 days.
3.What payment methods are accepted for AT25320B-MAHL-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320B-MAHL-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320B-MAHL-E?
AT25320B-MAHL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320B-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 AT25320B-MAHL-E?
For technical support, including AT25320B-MAHL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320B-MAHL-E requirements.
6.How does Aetrix verify that AT25320B-MAHL-E is sourced from the original manufacturer or authorized distributors?
All AT25320B-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 AT25320B-MAHL-E meets industry standards.
7.What is the process for return or replacement of AT25320B-MAHL-E?
All AT25320B-MAHL-E units undergo pre-shipment inspection (PSI). If there is an issue with AT25320B-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 AT25320B-MAHL-E part is unused and in its original packaging.
Return procedure for AT25320B-MAHL-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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