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Microchip Technology AT25320AN-10SI-1.8-T
- Part No.:
- AT25320AN-10SI-1.8-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25320AN-10SI-1.8-T.pdf
- Description:
- IC EEPROM 32KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,789
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Product details
Overview
AT25320AN-10SI-1.8-T from Microchip Technology (formerly Atmel) is a 32-Kbit SPI serial EEPROM organized as 4096 × 8-bit memory, supporting 1.8V to 5.5V operation, 20 MHz clock rate at 5V, 32-byte page write, and hardware/software write protection via WP pin and status register. It serves in automotive control modules requiring nonvolatile parameter storage under extended temperature.
For engineers reviewing the AT25320AN-10SI-1.8-T datasheet, AT25320AN-10SI-1.8-T pinout, AT25320AN-10SI-1.8-T application, or AT25320AN-10SI-1.8-T equivalent, key selection criteria include 1.8V low-voltage compatibility, automotive-grade −40°C to +125°C operation, block write protection granularity, self-timed 5 ms max write cycle, and JEDEC SOIC-8 package footprint.
Technical Context
The AT25320AN-10SI-1.8-T implements a synchronous SPI slave interface compliant with Modes 0 and 3, using separate SI/SO lines and CS-controlled access. Its internal architecture includes an 8-bit instruction register, nonvolatile status register (BP0/BP1/WPEN/RDY/WEN), and automatic address incrementing during sequential reads.
Block write protection is configured via two nonvolatile BP bits enabling 0%, 25%, 50%, or 100% array protection; hardware write protection engages when WP is low and WPEN = 1. The HOLD pin suspends ongoing serial transfers without resetting the sequence, preserving state across master pauses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 × 8-bit), directly replaceable in 32K EEPROM BOMs without address decoding changes |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic systems and mixed-voltage microcontrollers |
| Max Clock Frequency | 20 MHz at VCC = 5.0V - supports high-throughput configuration loading in real-time control loops |
| Write Cycle Time | 5 ms maximum - deterministic programming latency for time-critical firmware update sequences |
| Endurance & Retention | 1 million write cycles / 100-year data retention - meets automotive ECU calibration storage lifetime requirements |
| Operating Temperature | −40°C to +125°C - qualified for engine bay and transmission control unit mounting locations |
| Package | 8-lead JEDEC SOIC (8S1), 150-mil width - standard footprint compatible with automated SMT assembly |
Pinout & Package
AT25320AN-10SI-1.8-T uses an 8-lead JEDEC SOIC (8S1) package: 4.8–5.0 mm × 3.81–3.99 mm body, 1.27 mm lead pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; device ignores SI and drives SO high-Z when CS high - enables multi-device SPI bus sharing |
| SCK | Serial Clock Input | Master-generated clock synchronizing all data transfers; supports Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) |
| SI | Serial Data Input | Receives op-codes, addresses, and write data MSB-first; latched on SCK rising edge in Mode 0 |
| SO | Serial Data Output | Drives read data MSB-first; tri-stated when CS high or during HOLD - prevents bus contention |
| WP | Write Protect Input | Hardware lock for status register and protected memory blocks when WPEN=1 and WP low - prevents accidental overwrites |
| HOLD | Serial Transfer Suspend | Pauses ongoing read/write without resetting address counter; requires SCK low during assertion - supports multi-master arbitration |
| VCC | Power Supply | 1.8–5.5V supply; internal regulation ensures stable core voltage across full range - eliminates external LDO for 1.8V systems |
| GND | Ground Reference | Return path for all I/O and core circuitry; separate analog/digital ground not required due to integrated noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write | Enables burst programming of up to 32 bytes per CS cycle - reduces firmware update time by >75% vs. byte-write |
| Four-Level Block Protection | BP1/BP0 bits configure 0%/25%/50%/100% memory lock - allows independent protection of calibration tables, fault logs, and user settings |
| Self-Timed Internal Write | No external erase step required; tWC ≤ 5 ms guarantees predictable completion - simplifies host firmware timing logic |
| Automotive Grade Qualification | AEC-Q100 stress-tested for −40°C to +125°C operation - certified for powertrain and chassis control applications |
| Low Standby Current | ISB1 < 0.1 µA at 1.8V - extends battery life in always-on telematics and ADAS modules |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 100-year retention and 1M endurance for field-updatable calibration data. Use Value: Eliminates need for backup capacitors or external supervisors; withstands repeated reprogramming during dealer reflashes. |
Use Scenario: Saving camera lens calibration offsets, radar sensor alignment matrices, and lane-departure thresholds. IC Role / Device Role / Timing Role: SPI-configurable memory accessed during boot and runtime by SoC's dedicated SPI controller. Use Value: Supports AEC-Q100 Grade 0/1 requirements; 125°C operation ensures reliability near front-end radar modules. |
| Industrial PLC I/O Modules | Medical Infusion Pumps |
|
Use Scenario: Retaining channel-specific scaling factors, alarm thresholds, and module identification after power loss. IC Role / Device Role / Timing Role: Low-voltage (1.8V) SPI EEPROM interfaced to ARM Cortex-M4-based controller with shared bus. Use Value: 1.8V compatibility enables direct connection to 1.8V I/O banks; 32-byte page writes accelerate factory configuration loading. |
Use Scenario: Storing drug library profiles, dose history logs, and safety-critical pump calibration constants. IC Role / Device Role / Timing Role: Safety-certified nonvolatile memory storing FDA-required audit trails and device-specific parameters. Use Value: 100-year data retention meets ISO 13485 long-term recordkeeping mandates; WP pin hardens against unintended writes during maintenance. |
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, SOIC-8; identical pinout but STMicroelectronics silicon; RDY/BSY flag implemented differently (status bit vs. dedicated pin) | Same automotive qualification level (AEC-Q100 Grade 1); differs in HOLD timing spec (tHD/tCD min 25 ns vs. 50 ns) | Select when existing ST ecosystem mandates cross-supplier sourcing or when tighter HOLD setup margin is required. |
| BR24T32FJ-WE2 | 32 Kbit I²C EEPROM, 1.7–5.5V, 1 MHz max, TSSOP-8; different interface (I²C vs. SPI), no HOLD pin, no block protection bits | Lacks SPI-native speed and hardware write protection granularity; suited for space-constrained consumer devices, not automotive real-time systems | Choose only for cost-sensitive, non-automotive designs where I²C bus already exists and 20 MHz throughput is unnecessary. |
Compared with M95320-DRMN3TP/K, AT25320AN-10SI-1.8-T offers identical functional coverage but superior HOLD timing margin and native Atmel firmware toolchain support; versus BR24T32FJ-WE2, it delivers 20× faster interface speed and robust hardware-based memory segmentation essential for safety-critical firmware updates.
Availability
AT25320AN-10SI-1.8-T is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, medical infusion pumps, and ADAS sensor modules requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for AT25320AN-10SI-1.8-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 full product continuity, qualification, and support for the AT25xxx family of serial EEPROMs.
The AT25320AN-10SI-1.8-T belongs to Microchip's automotive-qualified SPI EEPROM product line, designed specifically for mission-critical nonvolatile storage in harsh-environment electronic control units.
FAQ
What is the operating voltage range for the AT25320AN-10SI-1.8-T?
The AT25320AN-10SI-1.8-T operates from 1.8V to 5.5V, with full functionality-including 20 MHz clock rate and 5 ms write cycle-guaranteed across this entire range. This dual-voltage capability allows direct integration into both 1.8V logic domains and legacy 3.3V/5V systems without level-shifting circuitry.
Does the AT25320AN-10SI-1.8-T support SPI Mode 0 and Mode 3 exclusively?
Yes, the AT25320AN-10SI-1.8-T explicitly supports only SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), as confirmed in its official datasheet. It does not support Mode 1 or Mode 2; attempting to use unsupported modes will result in undefined communication behavior.
How does the WRITE PROTECT (WP) pin function on the AT25320AN-10SI-1.8-T?
The WP pin on the AT25320AN-10SI-1.8-T enables hardware write protection only when the WPEN bit in the status register is set to "1". When WP is low and WPEN=1, writes to the status register and block-protected memory segments are inhibited. If WPEN=0, the WP pin has no effect - allowing system-level flexibility in grounding schemes.
What is the maximum clock frequency supported by the AT25320AN-10SI-1.8-T at 1.8V supply?
At VCC = 1.8V, the AT25320AN-10SI-1.8-T supports a maximum SCK frequency of 5 MHz, as specified in its AC Characteristics table for the 1.8–5.5V voltage range. This is lower than its 20 MHz rating at 5.0V but sufficient for most low-power configuration and logging tasks.
Is the AT25320AN-10SI-1.8-T qualified for automotive applications?
Yes, the AT25320AN-10SI-1.8-T is explicitly rated for automotive-grade operation from −40°C to +125°C and carries AEC-Q100 qualification. Its packaging, testing, and screening meet automotive reliability standards, making it suitable for engine control, transmission, and ADAS applications.
AT25320AN-10SI-1.8-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
AT25320AN-10SI-1.8-T FAQ
1.How can I place an order for AT25320AN-10SI-1.8-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320AN-10SI-1.8-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 AT25320AN-10SI-1.8-T reliable?
The price and inventory of AT25320AN-10SI-1.8-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320AN-10SI-1.8-T is usually 5 days.
3.What payment methods are accepted for AT25320AN-10SI-1.8-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320AN-10SI-1.8-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320AN-10SI-1.8-T?
AT25320AN-10SI-1.8-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320AN-10SI-1.8-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 AT25320AN-10SI-1.8-T?
For technical support, including AT25320AN-10SI-1.8-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320AN-10SI-1.8-T requirements.
6.How does Aetrix verify that AT25320AN-10SI-1.8-T is sourced from the original manufacturer or authorized distributors?
All AT25320AN-10SI-1.8-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 AT25320AN-10SI-1.8-T meets industry standards.
7.What is the process for return or replacement of AT25320AN-10SI-1.8-T?
All AT25320AN-10SI-1.8-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25320AN-10SI-1.8-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 AT25320AN-10SI-1.8-T part is unused and in its original packaging.
Return procedure for AT25320AN-10SI-1.8-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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