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Microchip Technology AT25020N-10SI
- Part No.:
- AT25020N-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25020N-10SI.pdf
- Description:
- IC EEPROM 2KBIT SPI 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,113
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Product details
Overview
AT25020N-10SI from Atmel (now Microchip) is a 2-Kbit SPI serial EEPROM organized as 256 × 8 bits, supporting 1.8V–5.5V operation with 2.1 MHz clock rate at 5V, 8-byte page write, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in industrial microcontroller systems requiring reliable low-power data retention.
For engineers reviewing the AT25020N-10SI datasheet, AT25020N-10SI pinout, AT25020N-10SI application, or AT25020N-10SI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), JEDEC SOIC-8 package, SPI Mode 0/3 compatibility, block write protection granularity, and self-timed 10 ms max write cycle.
Technical Context
The AT25020N-10SI operates as an SPI slave device with separate SI/SO pins, MSB-first data transfer, and CS-driven command framing. Its instruction set includes WREN/WRDI for write enable control, RDSR/WRSR for status and protection management, and READ/WRITE with automatic address increment.
It implements nonvolatile BP0/BP1 bits in the status register to configure write protection across 1/4, 1/2, or full memory array-matching physical address ranges C0–FFh for the 2K variant. The HOLD pin suspends ongoing serial communication without resetting the sequence, while WP provides hardware-level write inhibition independent of software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 words × 8 bits), directly addressable via 8-bit address field with A8 in op-code |
| Supply Voltage Range | 2.7V to 5.5V - enables interoperability with 3.3V and 5V microcontrollers without level shifting |
| Max Clock Frequency | 2.1 MHz at VCC = 4.5–5.5V - supports high-speed configuration reads in time-critical boot sequences |
| Write Cycle Time | 10 ms maximum - defines minimum interval between write commands; no external erase needed |
| Endurance & Retention | 1 million write cycles / 100 years data retention - suitable for infrequent but mission-critical parameter storage |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and metering |
| ESD Protection | >4000V HBM - reduces risk of field failure during handling or system integration |
Pinout & Package
AT25020N-10SI is housed in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide, with gull-wing leads and standard footprint compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge and latches first byte as op-code |
| SCK | Serial Clock | Input-only master-generated clock; timing determines max throughput and setup/hold compliance |
| SI | Serial Data Input | Accepts op-code, address, and data; ignored during HOLD or when CS is high |
| SO | Serial Data Output | Tri-state output delivering read data; high-impedance when CS high or during write cycle |
| WP | Write Protect | Hardware lock: low disables all write operations regardless of WREN status or status register settings |
| HOLD | Communication Suspend | Pauses active SPI transaction without losing internal address/state; requires SCK low to assert |
| VCC | Power Supply | Single supply input; supports 2.7–5.5V range with specified ICC/ISB across voltage and temperature |
| GND | Ground Reference | Return path for all I/O and power; decoupling capacitor placement critical for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 Support | Compatible with both common microcontroller SPI configurations (CPOL=0/CPHA=0 and CPOL=1/CPHA=1) |
| Four-Level Block Write Protection | Status register BP1/BP0 bits protect top quarter (C0–FFh), top half, or entire 2K array against accidental overwrite |
| 8-Byte Page Write Capability | Reduces write latency vs. byte-wise programming; address auto-increments within page boundary only |
| Self-Timed Internal Write Cycle | Eliminates need for external delay timers or polling overhead beyond RDSR-ready check |
| Dual Write Protection Mechanism | Combines hardware (WP pin) and software (WREN + status register) layers for robust data integrity |
Applications
| Industrial PLC Configuration Storage | Smart Meter Parameter Retention |
|---|---|
Use Scenario: Storing calibration coefficients, firmware version flags, and operational thresholds in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ARM Cortex-M or 8051-based controller via 3-wire SPI. Use Value: −40°C to +85°C rating and 1M endurance ensure reliable parameter persistence over 10+ years of unattended operation. |
Use Scenario: Holding tariff tables, billing counters, and tamper-detection logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power EEPROM providing authenticated data storage with hardware WP pin tied to security module. Use Value: Block write protection prevents unauthorized modification of revenue-critical registers while enabling field-upgradable firmware metadata. |
| Medical Device Calibration Memory | Automotive Body Control Module Settings |
Use Scenario: Archiving sensor offset/gain values and user-adjusted therapy parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: SPI EEPROM accessed during power-on initialization to restore precision analog subsystem settings. Use Value: 100-year data retention and >4kV ESD rating meet IEC 60601-1 requirements for long-term clinical reliability. |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior in 12V automotive body control units. IC Role / Device Role / Timing Role: Low-voltage (2.7–5.5V) serial EEPROM interfaced to Infineon AURIX or NXP S32K MCU over robust SPI bus. Use Value: Industrial temp grade and 2.1 MHz interface speed support fast boot-time recall of user preferences without MCU wait states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | 256 Kbit capacity, 20 MHz SPI, 1.8–5.5V, WLCSP package option | Higher density and speed; lacks HOLD pin and identical BP granularity | Choose for bandwidth-constrained designs needing larger config space; verify HOLD dependency and protection mapping |
| BR25L20FJ-WE2 | 2 Kbit, 10 MHz SPI, 1.7–5.5V, built-in error correction (ECC), SOP-8 | ECC improves bit-error resilience; different status register layout and no WP pin | Prefer where radiation-induced soft errors are a concern; requires firmware adaptation for status/control flow |
Compared with AT25020N-10SI, M95256-WMN6TP offers higher density and speed but omits HOLD functionality and uses coarser block protection, while BR25L20FJ-WE2 adds ECC at the cost of incompatible status register semantics and absence of hardware write protect-making AT25020N-10SI optimal for legacy SPI designs requiring pin- and command-level compatibility.
Availability
AT25020N-10SI is available at Aetrix Electronics and suitable for industrial automation, smart metering, and medical diagnostics requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for AT25020N-10SI 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
Atmel Corporation, now part of Microchip Technology, is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT250xx family was designed specifically for SPI-based embedded systems needing compact, low-power, industrial-grade serial EEPROM with flexible voltage operation and robust data protection.
FAQ
What is the memory organization of the AT25020N-10SI?
The AT25020N-10SI contains 2048 bits of EEPROM memory organized as 256 words × 8 bits. Addressing uses an 8-bit field (A7–A0) transmitted after the READ or WRITE op-code, with the MSB (A8) embedded in the op-code byte itself-enabling direct access to the full 2K address space without external address latching.
Does the AT25020N-10SI support SPI Mode 1 or Mode 2?
No, the AT25020N-10SI explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in its Features section and timing diagrams. It does not function correctly in Mode 1 or Mode 2 due to fixed sampling/setting edges relative to SCK transitions.
How does the HOLD pin function during an active AT25020N-10SI SPI transaction?
The HOLD pin on the AT25020N-10SI suspends serial communication when pulled low while SCK is low, preserving internal address and command state. Communication resumes when HOLD returns high with SCK still low-no reinitialization or CS toggle is required, making it ideal for interrupt-driven MCU architectures.
Can the AT25020N-10SI be used in a 1.8V system?
No-the AT25020N-10SI variant is rated for 2.7V to 5.5V operation. For 1.8V systems, the correct part is AT25020N-10SI-1.8, which has distinct ordering code, tested DC/AC characteristics at 1.8–3.6V, and reduced max clock frequency (500 kHz). Using AT25020N-10SI below 2.7V violates specifications and risks functional failure.
What happens if the WP pin is driven low during a write cycle on the AT25020N-10SI?
If the WP pin is pulled low mid-write on the AT25020N-10SI, the ongoing write operation is immediately inhibited and the device enters standby mode. However, if the internal write cycle has already started (i.e., CS high after data transmission), WP going low has no effect-the write completes normally. This behavior is documented in the WRITE PROTECT section.
AT25020N-10SI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25020N-10SI FAQ
1.How can I place an order for AT25020N-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25020N-10SI 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 AT25020N-10SI reliable?
The price and inventory of AT25020N-10SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25020N-10SI is usually 5 days.
3.What payment methods are accepted for AT25020N-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25020N-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25020N-10SI?
AT25020N-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25020N-10SI 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 AT25020N-10SI?
For technical support, including AT25020N-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25020N-10SI requirements.
6.How does Aetrix verify that AT25020N-10SI is sourced from the original manufacturer or authorized distributors?
All AT25020N-10SI 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 AT25020N-10SI meets industry standards.
7.What is the process for return or replacement of AT25020N-10SI?
All AT25020N-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT25020N-10SI, 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 AT25020N-10SI part is unused and in its original packaging.
Return procedure for AT25020N-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25020N-10SI Tags
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