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Microchip Technology AT25320A-10TU-1.8
- Part No.:
- AT25320A-10TU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25320A-10TU-1.8.pdf
- Description:
- IC EEPROM 32KBIT SPI 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
AT25320A-10TU-1.8 from Microchip Technology (formerly Atmel) is a 32-Kbit SPI serial EEPROM organized as 4096 × 8 bits, operating from 1.8V to 5.5V supply, supporting 20 MHz clock rate at 5V, featuring 32-byte page write mode and hardware/software write protection via WP pin and status register. It is used in industrial control systems for storing calibration data, configuration settings, and firmware patch metadata.
For engineers reviewing the AT25320A-10TU-1.8 datasheet, AT25320A-10TU-1.8 pinout, AT25320A-10TU-1.8 application, or AT25320A-10TU-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8V, TSSOP-8 packaging with 4.4 mm body width, block write protection granularity (1/4, 1/2, or full array), HOLD pin for serial communication suspension, and 1 million write cycles endurance.
Technical Context
The AT25320A-10TU-1.8 implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI and SO lines for full-duplex communication. Its internal architecture includes an 8-bit instruction register, nonvolatile status register with BP0/BP1/WPEN bits, and automatic address incrementing during page writes.
It supports dual-voltage operation (1.8–5.5V), self-timed write cycles (≤5 ms), and features dedicated HOLD and WP pins for real-time serial bus management and hardware-level write inhibition. The device powers up in write-disabled state and requires explicit WREN instruction before programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8 bits) - provides sufficient storage for device configuration, sensor calibration tables, and boot parameters in space-constrained embedded nodes. |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level-shifting. |
| Max Clock Frequency | 20 MHz at VCC = 5V - supports high-speed parameter updates in real-time control loops and fast boot-time configuration loading. |
| Page Write Size | 32 bytes - minimizes write latency per transaction and reduces host MCU overhead versus byte-write-only EEPROMs. |
| Write Endurance | 1,000,000 cycles - ensures reliable logging of infrequent but critical events (e.g., power-fail counters, fault records) over 10+ years of field operation. |
| Data Retention | 100 years - guarantees long-term integrity of factory-trimmed coefficients and security keys without refresh. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in motor drives, PLC modules, and outdoor metering equipment. |
Pinout & Package
AT25320A-10TU-1.8 is packaged in an 8-lead TSSOP (JEDEC MO-153, variation AA) with 4.4 mm body width, 0.65 mm lead pitch, and RoHS-compliant green finish (U suffix). Pin 1 is marked by a notch or dot at the top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept op-codes and data; high-Z SO when CS is high. |
| 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 op-codes, addresses, and write data; MSB-first transmission. |
| SO | Serial Data Output | Slave-to-master data path for read data and status register contents; tri-stated when CS is high. |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; must be low-impedance to minimize noise on SPI lines. |
| VCC | Power Supply | Single supply input supporting 1.8–5.5V; decoupling capacitor (0.1 µF) required within 10 mm of pin. |
| WP | Write Protect | Hardware lock for status register and protected memory blocks when WPEN = 1 and WP = low. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low during assertion/deassertion. |
Key Features
| Feature | Design Value |
|---|---|
| Block Write Protection | Configurable via status register to protect 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical calibration or security sectors. |
| 32-byte Page Write Mode | Reduces average write time by 32× vs. byte-write; enables efficient bulk updates of configuration structures without host-side buffering. |
| HOLD Pin Functionality | Allows multi-master arbitration or CPU interrupt servicing without losing SPI context - eliminates need for retransmission after hold release. |
| Low-Voltage Operation (1.8V) | Enables direct integration into battery-powered IoT sensors and ultra-low-power wake-on-event subsystems without voltage translation. |
| Self-Timed Write Cycle | Internal timing eliminates external delay requirements; RDSR polling confirms completion - simplifies firmware and avoids fixed wait loops. |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing temperature, pressure, and humidity sensor trim coefficients and linearization tables during factory calibration and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up and periodic self-test; SPI interface synchronized to MCU clock at ≤10 MHz. Use Value: Enables single-point calibration across temperature ranges with 100-year data retention, eliminating need for external backup power or supercapacitors. |
Use Scenario: Holding tariff schedules, billing registers, tamper logs, and communication module settings in residential and commercial electricity/water meters. IC Role / Device Role / Timing Role: Secure, write-protected parameter repository; WP pin tied low during firmware update to prevent corruption of billing counters. Use Value: Block protection isolates revenue-critical registers from firmware update routines, satisfying ANSI C12.22 and DLMS/COSEM security requirements. |
| PLC I/O Module Parameterization | Medical Device Safety Settings |
Use Scenario: Saving channel-specific gain/offset values, filter coefficients, and diagnostic thresholds for analog input/output modules in programmable logic controllers. IC Role / Device Role / Timing Role: SPI-configurable memory mapped by ARM Cortex-M4 host; accessed during module initialization and runtime diagnostics. Use Value: 1M endurance supports daily recalibration cycles over 10+ years; HOLD pin allows seamless parameter reload during live I/O scanning. |
Use Scenario: Storing FDA-mandated safety limits (e.g., maximum infusion rate, temperature cutoffs) and user-accessible therapy presets in infusion pumps and ventilators. IC Role / Device Role / Timing Role: Fail-safe configuration store with hardware write lock; WP pin hardwired to ground and WPEN set to '1' in production firmware. Use Value: Prevents unauthorized modification of life-critical parameters even if host MCU is compromised; meets IEC 62304 Class B software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-DRMN3TP/K | 32-Kbit SPI EEPROM, 1.8–5.5V, 20 MHz, TSSOP-8, but uses different status register bit layout and lacks HOLD pin. | No HOLD functionality limits use in multi-interrupt real-time systems requiring pause/resume of SPI transfers. | Select when HOLD is unused and STMicroelectronics supply chain preference applies; verify BP bit mapping differs from AT25320A. |
| BR24T32FJ-WE2 | 32-Kbit I²C EEPROM, 1.7–5.5V, 1 MHz max, 8-pin SOP-J8, no WP/HOLD pins, software-only write protection. | I²C interface requires different MCU peripheral setup and has lower bandwidth; no hardware write lock increases vulnerability to firmware bugs. | Choose for cost-sensitive designs where I²C is already dominant and 20 MHz SPI speed is unnecessary. |
Compared with M95320-DRMN3TP/K and BR24T32FJ-WE2, the AT25320A-10TU-1.8 uniquely combines 20 MHz SPI performance, dedicated HOLD and WP pins, and field-proven 1M-cycle endurance in industrial TSSOP packaging - making it optimal for deterministic, safety-critical, and high-throughput embedded storage.
Availability
AT25320A-10TU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and PLC I/O module parameterization requiring stable component supply across extended product lifecycles.
Supply support for AT25320A-10TU-1.8 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 support for the AT25xxxA family of SPI EEPROMs, delivering high-reliability nonvolatile memory solutions for industrial, automotive, and consumer applications.
The AT25320A-10TU-1.8 belongs to Microchip's serial EEPROM product line, designed specifically for robust, low-power, and pin-efficient configuration storage in resource-constrained embedded systems requiring guaranteed data integrity over decades.
FAQ
What is the memory organization of the AT25320A-10TU-1.8?
The AT25320A-10TU-1.8 contains 32,768 bits of EEPROM memory organized as 4096 words × 8 bits. This structure supports byte-aligned reads and writes, with address range A11–A0 (12-bit addressing), and is optimized for storing firmware configuration blocks, sensor calibration data, and system parameters in embedded applications where deterministic access timing is required.
Does the AT25320A-10TU-1.8 support both SPI Mode 0 and Mode 3?
Yes, the AT25320A-10TU-1.8 is compatible with SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in its official datasheet. Mode 0 operation is explicitly described and characterized, while Mode 3 support is documented for interoperability with legacy controllers. Both modes maintain identical timing specifications and functional behavior for read/write operations.
How does the WRITE PROTECT (WP) pin function in the AT25320A-10TU-1.8?
In the AT25320A-10TU-1.8, the WP pin inhibits writes to the status register and protected memory blocks only when the WPEN bit is set to '1' in the status register and WP is driven low. If WPEN = '0', the WP pin is ignored. This dual-control mechanism allows flexible system-level protection strategies - for example, tying WP to ground while enabling WPEN only during secure firmware updates.
What is the purpose of the HOLD pin on the AT25320A-10TU-1.8?
The HOLD pin on the AT25320A-10TU-1.8 suspends ongoing SPI communication without resetting the internal command or address counter. When asserted (low) while SCK is low, it places SO in high-impedance state and ignores SI inputs. This enables deterministic pause/resume behavior during CPU interrupts or multi-master arbitration, preserving full transaction context across hold periods.
Can the AT25320A-10TU-1.8 operate reliably at 1.8V supply voltage?
Yes, the AT25320A-10TU-1.8 is fully specified for operation from 1.8V to 5.5V. At 1.8V, it supports up to 5 MHz clock frequency (per AC Characteristics Table 1-3), maintains full read/write functionality, and delivers guaranteed 1 million write cycles and 100-year data retention - making it suitable for battery-backed and energy-harvesting applications where ultra-low-voltage operation is mandatory.
AT25320A-10TU-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-TSSOP
AT25320A-10TU-1.8 FAQ
1.How can I place an order for AT25320A-10TU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320A-10TU-1.8 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 AT25320A-10TU-1.8 reliable?
The price and inventory of AT25320A-10TU-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320A-10TU-1.8 is usually 5 days.
3.What payment methods are accepted for AT25320A-10TU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320A-10TU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320A-10TU-1.8?
AT25320A-10TU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320A-10TU-1.8 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 AT25320A-10TU-1.8?
For technical support, including AT25320A-10TU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320A-10TU-1.8 requirements.
6.How does Aetrix verify that AT25320A-10TU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT25320A-10TU-1.8 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 AT25320A-10TU-1.8 meets industry standards.
7.What is the process for return or replacement of AT25320A-10TU-1.8?
All AT25320A-10TU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT25320A-10TU-1.8, 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 AT25320A-10TU-1.8 part is unused and in its original packaging.
Return procedure for AT25320A-10TU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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