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Microchip Technology AT25320B-MAHL-T
- Part No.:
- AT25320B-MAHL-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25320B-MAHL-T.pdf
- Description:
- IC EEPROM 32KBIT SPI 20MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,615
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Product details
Overview
AT25320B-MAHL-T from Microchip Technology (formerly Atmel) is a 32-kbit SPI serial EEPROM organized as 4,096 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. It serves as nonvolatile configuration storage in industrial controllers, sensor nodes, and power management systems.
For engineers reviewing the AT25320B-MAHL-T datasheet, AT25320B-MAHL-T pinout, AT25320B-MAHL-T application, or AT25320B-MAHL-T equivalent, key selection criteria include voltage range compatibility (1.8–5.5V), SPI Mode 0/3 support, block write protection granularity (1/4, 1/2, full array), HOLD pin suspend functionality, and UDFN-8 package footprint constraints.
Technical Context
The AT25320B-MAHL-T implements a synchronous slave SPI interface with separate SI (input) and SO (output) pins, requiring CS low for selection and supporting MSB-first data transfer. Its internal architecture includes an 8-bit instruction register, address decoder, and status register with nonvolatile BP0/BP1/WE/WPEN bits controlling protection scope and hardware enable state.
Write operations require explicit WREN instruction before WRITE or WRSR; self-timed internal write cycles complete in ≤5ms with no external erase step. The HOLD pin suspends ongoing serial communication without resetting the sequence when asserted low during SCK low time, while WP pin-when enabled via WPEN-blocks status register writes during low assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32,768 bits (4,096 × 8), sufficient for firmware parameter tables or calibration data in compact embedded systems |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic, 3.3V microcontrollers, and legacy 5V systems without level shifting |
| Max Clock Frequency | 20 MHz at 5V - supports high-throughput configuration reads in real-time control loops |
| Page Write Size | 32 bytes - minimizes write latency versus byte-wise programming; rollover behavior requires software address boundary checks |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention - suitable for field-updatable systems with infrequent but critical parameter changes |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including motor drives and outdoor telemetry units |
| Write Cycle Time | ≤5 ms - deterministic timing allows precise host-side polling via RDSR RDY bit without timeout uncertainty |
Pinout & Package
AT25320B-MAHL-T uses an 8-pad, 2.00 mm × 3.00 mm body, 0.50 mm pitch Ultra Thin Dual Flat No-Lead (UDFN) package (JEDEC MO-229 compliant), optimized for space-constrained PCB layouts in portable and IoT edge devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction; high-to-low transition initiates opcode reception |
| SCK | Serial Clock | Input-only clock synchronized to master; defines timing for SI sampling and SO output edges per SPI Mode 0/3 |
| SI | Serial Data Input | Master-to-slave data path carrying opcodes, addresses, and write data; MSB-first, sampled on SCK rising edge (Mode 0) |
| SO | Serial Data Output | Slave-to-master data path for read data and status register contents; tri-state when CS high or HOLD active |
| GND | Ground Reference | Return path for VCC and all I/O signals; requires low-impedance connection to minimize noise coupling into EEPROM operation |
| VCC | Power Supply | Single supply input (1.8–5.5V); decoupling capacitor (0.1 µF ceramic) required within 5 mm of VCC/GND pins |
| WP | Write Protect | Hardware lock for status register writes when WPEN=1; tied low to prevent accidental configuration corruption during system power transitions |
| HOLD | Communication Suspend | Pauses SPI transfer mid-sequence without losing internal address/state; used to service higher-priority interrupts on host MCU |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable via status register to protect 0%, 25%, 50%, or 100% of memory array - prevents firmware corruption during brown-out or reset events |
| Hardware + Software Write Enable | WREN instruction required before any write; WRDI disables further writes until next WREN - eliminates spurious writes from noise or glitchy CS |
| HOLD Pin Functionality | Suspends ongoing read/write without resetting internal address counter - enables deterministic multi-tasking on resource-limited MCUs |
| Green Packaging | Pb/Halide-free, RoHS-compliant UDFN-8 package with NiPdAu lead finish - meets environmental compliance for global industrial deployments |
| Low Standby Current | <0.1 µA at 1.8V - extends battery life in always-on sensor nodes where EEPROM retains calibration between wake cycles |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime via SPI; HOLD pin used to pause reads during motion-control interrupt servicing. Use Value: Ensures deterministic startup after power loss and enables field recalibration without firmware reflash - reducing maintenance downtime. | Use Scenario: Retaining temperature-compensated offset/gain coefficients in MEMS pressure sensors used in HVAC monitoring systems. IC Role / Device Role / Timing Role: SPI EEPROM holding factory-trimmed calibration constants; WP pin hardwired low to prevent accidental overwrites during sensor self-test sequences. Use Value: Maintains measurement accuracy across 10+ year product lifetime with guaranteed 1M write cycles - eliminating need for periodic sensor replacement. |
| Power Supply Sequencing Controller | Medical Device Safety Parameters |
Use Scenario: Storing voltage ramp rates, fault recovery delays, and channel enable states in multi-rail DC-DC sequencers for FPGA-based equipment. IC Role / Device Role / Timing Role: Configuration memory accessed during power-up initialization; 32-byte page writes optimize update speed when adjusting sequencing profiles remotely. Use Value: Enables dynamic reconfiguration of power tree behavior without hardware modification - accelerating design validation and field upgrades. | Use Scenario: Holding device-specific safety limits (e.g., maximum infusion rate, temperature cutoffs) in battery-powered insulin pumps certified to IEC 62304. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage with dual protection (WP pin + status register BP bits) ensuring critical parameters survive ESD events and software faults. Use Value: Meets Class C software safety requirements by preventing unauthorized modification of life-critical operational boundaries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-DFMN6TP | 32Kb SPI EEPROM, 1.8–5.5V, 20MHz, SO8 package; lacks HOLD pin and has different status register layout | No suspend capability - unsuitable where host MCU must interrupt EEPROM access for time-critical tasks | Select when board space allows SOIC and HOLD functionality is unnecessary |
| BR24G32FJ-3GE2 | 32Kb I²C EEPROM, 1.7–5.5V, 1MHz max, 8-pin TSSOP; uses two-wire interface and lacks WP/HOLD pins | Requires I²C host interface and cannot support simultaneous read/write arbitration like SPI HOLD | Choose for systems already using I²C peripherals and where lower pin count outweighs SPI performance needs |
Compared with M95320-DFMN6TP and BR24G32FJ-3GE2, AT25320B-MAHL-T provides unique HOLD functionality for deterministic interrupt handling and UDFN-8 packaging for ultra-compact designs, making it optimal for space-constrained industrial controllers requiring robust configuration persistence.
Availability
AT25320B-MAHL-T is available at Aetrix Electronics and suitable for industrial PLCs, smart sensors, power sequencers, and medical device safety parameter storage requiring stable component supply across extended product lifecycles.
Supply support for AT25320B-MAHL-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
Microchip Technology acquired Atmel in 2016 and maintains its portfolio of high-reliability serial EEPROMs, microcontrollers, and analog products for industrial, automotive, and consumer markets.
The AT25320B-MAHL-T belongs to Microchip's legacy Atmel SPI EEPROM family, designed specifically for low-voltage, low-power embedded systems needing robust nonvolatile storage with flexible hardware write protection and compact packaging.
FAQ
What is the maximum clock frequency supported by AT25320B-MAHL-T at 3.3V operation?
The AT25320B-MAHL-T supports up to 10 MHz SCK frequency when operated at 2.5–3.6V supply, as specified in Table 4-3 AC Characteristics. This ensures reliable high-speed reads in 3.3V microcontroller systems without violating setup/hold timing margins.
Does AT25320B-MAHL-T require an external pull-up resistor on the SO pin?
No, AT25320B-MAHL-T features an internally controlled tri-state output driver on the SO pin. External pull-ups are unnecessary and may cause bus contention during active drive or high-impedance states, potentially corrupting read data.
How does the WP pin interact with the WPEN bit in the status register of AT25320B-MAHL-T?
In AT25320B-MAHL-T, the WP pin only affects status register writes when the WPEN bit is set to 1. If WPEN = 0, the WP pin is ignored entirely. When WPEN = 1 and WP is low, all status register writes (including BP bits and WPEN itself) are blocked - providing hardware-enforced configuration lockdown.
Can AT25320B-MAHL-T be used in SPI Mode 3 (CPOL=1, CPHA=1)?
Yes, AT25320B-MAHL-T explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in the Features section. The device samples SI on SCK falling edge and drives SO on SCK rising edge in Mode 3, maintaining full protocol compliance.
What is the purpose of the HOLD pin in AT25320B-MAHL-T, and how must it be timed?
The HOLD pin in AT25320B-MAHL-T suspends ongoing SPI communication without resetting the internal address counter or command state. To activate HOLD, the pin must be driven low while SCK is low; to resume, it must be returned high while SCK remains low - ensuring glitch-free interruption of multi-byte transfers.
AT25320B-MAHL-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-T FAQ
1.How can I place an order for AT25320B-MAHL-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320B-MAHL-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 AT25320B-MAHL-T reliable?
The price and inventory of AT25320B-MAHL-T 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-T is usually 5 days.
3.What payment methods are accepted for AT25320B-MAHL-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320B-MAHL-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320B-MAHL-T?
AT25320B-MAHL-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320B-MAHL-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 AT25320B-MAHL-T?
For technical support, including AT25320B-MAHL-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320B-MAHL-T requirements.
6.How does Aetrix verify that AT25320B-MAHL-T is sourced from the original manufacturer or authorized distributors?
All AT25320B-MAHL-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 AT25320B-MAHL-T meets industry standards.
7.What is the process for return or replacement of AT25320B-MAHL-T?
All AT25320B-MAHL-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25320B-MAHL-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 AT25320B-MAHL-T part is unused and in its original packaging.
Return procedure for AT25320B-MAHL-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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