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Microchip Technology AT25020-10PI
- Part No.:
- AT25020-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25020-10PI.pdf
- Description:
- IC EEPROM 2KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,513
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Product details
Overview
AT25020-10PI from Atmel (now Microchip) is a 2-Kbit SPI serial EEPROM organized as 256 × 8-bit memory, operating from 2.7V to 5.5V with industrial temperature range (–40°C to +85°C), 2.1 MHz max clock rate at 5V, and 10 ms max self-timed write cycle - used for nonvolatile configuration storage in microcontroller-based industrial control modules.
For engineers reviewing the AT25020-10PI datasheet, AT25020-10PI pinout, AT25020-10PI application, or AT25020-10PI equivalent, key selection criteria include voltage compatibility (2.7–5.5V), industrial-grade reliability (1M write cycles, 100-year retention), hardware/software write protection, 8-byte page write capability, and PDIP/SOIC package options.
Technical Context
The AT25020-10PI implements a 3-wire SPI slave interface (CS, SCK, SI/SO) supporting Modes 0 and 3, with dedicated HOLD and WP pins for communication suspension and hardware write inhibition. It uses an 8-bit instruction register with MSB-first data transfer and requires WREN before WRITE operations.
Its status register (BP1/BP0) enables configurable block write protection over 1/4, 1/2, or full memory array; internal address auto-increment supports continuous read; and all programming is self-timed with no external erase step required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 words × 8 bits) - fixed organization enabling byte-level random access and sequential reads without address wrap limitation in typical use. |
| Supply Voltage Range | 2.7V to 5.5V - supports mixed-voltage systems and eliminates need for level shifters when interfacing with 3.3V or 5V microcontrollers. |
| Max Clock Frequency | 2.1 MHz at VCC = 4.5–5.5V - enables fast configuration loading while maintaining timing margin across industrial temperature range. |
| Write Cycle Time | 10 ms maximum - deterministic programming latency allows precise host-side timeout handling without polling overhead. |
| Endurance & Retention | 1 million write cycles / 100 years data retention - validated for long-life deployment in firmware parameter storage and calibration logging. |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor metering applications without derating. |
| ESD Protection | >4000V HBM - robustness against handling and system-level ESD events in factory and field environments. |
Pinout & Package
AT25020-10PI is supplied in 8-pin PDIP (package code 8P3) with 0.300" width, suitable for through-hole prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept instructions; high-Z SO state when deasserted. |
| SCK | Serial Clock | Master-generated clock input; defines timing for SI sampling and SO output edges per SPI Mode 0/3. |
| SI | Serial Data Input | Unidirectional command/address/data input path; latched on SCK rising edge in Mode 0. |
| SO | Serial Data Output | Unidirectional data output path; driven on SCK falling edge in Mode 0; high-impedance when CS high or HOLD active. |
| GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance connection to minimize noise coupling into serial interface. |
| VCC | Power Supply | Single 2.7–5.5V supply; decoupling capacitor (0.1 µF) recommended within 10 mm of pin for stable SPI operation. |
| WP | Write Protect | Hardware lock: drives low to inhibit all write instructions regardless of status register or WREN state. |
| HOLD | Communication Suspend | Pauses ongoing SPI transaction without resetting internal state; requires SCK low during assertion/deassertion. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Compatibility | Interoperates with 68HC11, PIC, ARM Cortex-M, and other common MCU SPI peripherals without mode translation logic. |
| 8-Byte Page Write | Reduces total programming time by up to 8× vs. byte-write for contiguous configuration blocks, minimizing bus occupancy. |
| Block Write Protection (BP1/BP0) | Enables selective locking of top quarter (C0–FFh), top half (80–FFh), or full array (00–FFh) - prevents accidental overwrite of critical firmware parameters. |
| Hardware + Software Write Protection | Combines WP pin (instant hardware lock) and WRSR-controlled BP bits (nonvolatile software-defined zones) for defense-in-depth data integrity. |
| Industrial Temperature Rating | Guaranteed functionality from –40°C to +85°C without derating - eliminates thermal qualification effort for DIN-rail controllers and power supplies. |
Applications
| Industrial PLC Configuration Storage | Smart Sensor Calibration Memory |
|---|---|
|
Use Scenario: Storing I/O mapping, scaling coefficients, and alarm thresholds in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed via SPI during boot and runtime reconfiguration; retains values across power cycles and brownouts. Use Value: Enables field-updatable device behavior without firmware reflashing; 1M endurance supports daily recalibration logs over 10+ years. |
Use Scenario: Holding factory-trimmed offset/gain values and temperature compensation tables in MEMS pressure sensors for HVAC systems. IC Role / Device Role / Timing Role: Read-once-at-boot calibration data source; accessed early in startup sequence before analog signal conditioning is enabled. Use Value: Eliminates need for external trimming components; 100-year retention ensures accuracy stability across product lifetime without recalibration. |
| Energy Meter Firmware Parameter Table | Medical Device Usage Log |
|
Use Scenario: Recording tariff schedules, pulse constants, and CT/PT ratios in ANSI C12.20-compliant electricity meters operating in outdoor enclosures. IC Role / Device Role / Timing Role: Secure, write-protected configuration repository updated only during authenticated firmware upgrades or utility commissioning. Use Value: Block protection prevents unauthorized tampering; 2.7–5.5V operation accommodates wide-input DC-DC converters in meter power supplies. |
Use Scenario: Logging sterilization cycles, usage counts, and error codes in portable infusion pumps requiring FDA 21 CFR Part 11 compliance. IC Role / Device Role / Timing Role: Tamper-evident audit trail storage with hardware WP pin tied to enclosure interlock for physical write disable. Use Value: Meets medical device traceability requirements; >4000V HBM ESD rating withstands repeated handling in clinical environments. |
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, SO8 package only - no PDIP option. | Higher density and speed suit data-logging buffers; not drop-in for AT25020-10PI's 2K footprint or PDIP layout. | Select when needing larger storage or faster throughput; verify PCB pad compatibility and firmware address-space changes. |
| BR25G256FJ-3GE2 | 256 Kbit, 10 MHz SPI, 1.6–5.5V, built-in error correction (ECC), JEDEC SO8 only. | ECC support adds fault tolerance for safety-critical writes; lacks HOLD pin and industrial temp grade (–40°C to +105°C). | Prefer for automotive or high-reliability systems where bit errors must be corrected; not suitable for legacy PDIP designs. |
Compared with M95256-WMN6TP and BR25G256FJ-3GE2, the AT25020-10PI offers verified industrial temperature operation in both PDIP and SOIC packages, deterministic 10 ms write timing, and HOLD pin support - making it optimal for cost-sensitive, space-constrained, or through-hole industrial control boards requiring proven 2-Kbit nonvolatile storage.
Availability
AT25020-10PI is available at Aetrix Electronics and suitable for industrial PLCs, smart sensor nodes, energy meters, and medical device usage loggers requiring stable component supply and long-term obsolescence management.
Supply support for AT25020-10PI 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 (acquired by Microchip Technology in 2016) designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and consumer markets.
The AT250xx family delivers SPI EEPROMs optimized for low-power, multi-voltage embedded systems requiring robust configuration storage - targeting applications where pin count, board space, and long-term data integrity are critical.
FAQ
What is the memory organization of the AT25020-10PI?
The AT25020-10PI contains 2048 bits of serial EEPROM memory, organized as 256 words × 8 bits (256 addresses, each holding one byte). This fixed structure supports direct byte addressing and automatic address increment during sequential reads, simplifying firmware implementation for configuration storage tasks.
Does the AT25020-10PI support both 3.3V and 5V microcontrollers?
Yes, the AT25020-10PI operates across 2.7V to 5.5V, making it compatible with both 3.3V and 5V SPI masters without level shifting. Its VIH/VIL thresholds scale with VCC (e.g., VIH ≥ 0.7×VCC), ensuring reliable logic recognition across the full supply range - confirmed in DC Characteristics Table on page 3 of the datasheet.
How does hardware write protection work on the AT25020-10PI?
Hardware write protection is implemented via the WP pin: when pulled low, it disables all write operations (WREN, WRITE, WRSR) regardless of status register settings or software enable state. This provides immediate, physical prevention of accidental writes - a feature explicitly documented in the "WRITE PROTECT" section on page 6 of the AT25010/020/040 datasheet.
Can the AT25020-10PI be used in place of the AT25010 or AT25040?
No - the AT25020-10PI is not pin-compatible or functionally interchangeable with AT25010 (1K) or AT25040 (4K) variants. While all share identical pinout and instruction set, their memory sizes differ, requiring firmware address-space adjustments. The AT25020-10PI specifically provides 256-byte capacity, distinct from 128-byte (AT25010) or 512-byte (AT25040) layouts.
What is the purpose of the HOLD pin on the AT25020-10PI?
The HOLD pin suspends ongoing SPI communication without resetting the internal address counter or instruction state. When asserted low (with SCK low), it places SO in high-impedance and ignores SI inputs, allowing the master to service higher-priority interrupts and resume exactly where it left off - a capability detailed in the "HOLD" functional description on page 6 of the datasheet.
AT25020-10PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25020-10PI FAQ
1.How can I place an order for AT25020-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25020-10PI 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 AT25020-10PI reliable?
The price and inventory of AT25020-10PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25020-10PI is usually 5 days.
3.What payment methods are accepted for AT25020-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25020-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25020-10PI?
AT25020-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25020-10PI 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 AT25020-10PI?
For technical support, including AT25020-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25020-10PI requirements.
6.How does Aetrix verify that AT25020-10PI is sourced from the original manufacturer or authorized distributors?
All AT25020-10PI 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 AT25020-10PI meets industry standards.
7.What is the process for return or replacement of AT25020-10PI?
All AT25020-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT25020-10PI, 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 AT25020-10PI part is unused and in its original packaging.
Return procedure for AT25020-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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