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Microchip Technology 25AA020AT-I/OT
- Part No.:
- 25AA020AT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
25AA020AT-I/OT.pdf
- Description:
- IC EEPROM 2KBIT SPI SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,376
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Product details
Overview
25AA020AT-I/OT from Microchip Technology Inc. is a 2 Kbit SPI Serial EEPROM with 256 × 8-bit organization, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It supports up to 10 MHz clock frequency, 16-byte page write mode, and hardware write protection via WP pin - deployed in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 25AA020AT-I/OT datasheet, 25AA020AT-I/OT pinout, 25AA020AT-I/OT application, or 25AA020AT-I/OT equivalent, key selection criteria include SPI interface compatibility, low-voltage operation down to 1.8 V, 1 μA standby current, 1M endurance cycles, and X-rotated TSSOP-6 package footprint constraints.
Technical Context
The 25AA020AT-I/OT implements a standard SPI Mode 0,0/Master-Slave interface with separate SI (data in), SO (data out), SCK (clock), CS (chip select), HOLD (suspend), and WP (write-protect) signals. It uses internal high-voltage generation for EEPROM programming and features a nonvolatile STATUS register with WIP, WEL, BP0, and BP1 bits for real-time write status and block protection control.
It operates across 1.8–5.5 V with full AC timing compliance at all voltages: tWC ≤ 5 ms max write cycle, tCSH/tCSS ≤ 250 ns at 1.8 V, and guaranteed read/write functionality over –40°C to +85°C. The HOLD function suspends ongoing serial transfers without resetting the sequence, enabling host interrupt servicing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8-bit), sufficient for device ID, calibration coefficients, or boot configuration flags |
| Interface | SPI-compatible serial bus (Mode 0,0), requiring only CS, SCK, SI, SO, WP, HOLD, VCC, VSS |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V - enables fast parameter reads during system initialization |
| Write Endurance | 1,000,000 erase/write cycles - supports field-updatable calibration or logging in industrial sensors |
| Data Retention | >200 years at +25°C - ensures long-term reliability of stored configuration without refresh |
| Standby Current | 5 μA at 5.5 V, +125°C - minimizes power draw in battery-backed or energy-harvesting systems |
| Page Write Size | 16 bytes per page - allows efficient bulk writes while preventing cross-page wrap corruption |
Pinout & Package
25AA020AT-I/OT is packaged in X-rotated TSSOP-6 (OT), a space-constrained 6-pin surface-mount package with 0.95 mm pitch and 2.0 × 2.1 mm body size. Pin 1 is laser-marked; exposed pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground reference | Return path for all I/O and core logic; must be low-impedance for noise immunity |
| VDD | Supply voltage input | 1.8–5.5 V power rail; decoupling capacitor required within 1 cm of pin |
| CS | Chip Select input | Active-low enable; falling edge initiates instruction decode; rising edge triggers internal write |
| SO | Serial Data Output | Tri-state open-drain output; data valid after SCK falling edge; high-Z when CS = high |
| HOLD | Hold input | Active-low suspend signal; must be low while SCK = low to enter hold state |
| WP | Write-Protect input | Hardware lock: low disables all writes to memory and STATUS register regardless of WEL state |
Key Features
| Feature | Design Value |
|---|---|
| 1.8 V minimum operating voltage | Enables direct interfacing with ultra-low-power MCUs (e.g., PIC16LF, SAM L21) without level-shifting |
| Hardware write protection (WP pin) | Prevents accidental writes during power transients or firmware faults - no software dependency |
| Block protection via STATUS register | Configurable 0%, 25%, 50%, or 100% array lock using BP0/BP1 bits - supports secure bootloader regions |
| HOLD function with resume capability | Pauses SPI transfer mid-sequence; resumes from exact byte position after HOLD deassertion |
| Self-timed 5 ms max write cycle | Eliminates need for external write-complete polling delay; WIP bit allows precise software timing |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog front-end amplifiers in wireless environmental monitors. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed during power-up initialization via SPI read sequence. Use Value: Enables field recalibration without firmware update; 200-year data retention ensures accuracy over product lifetime. |
Use Scenario: Holding patient-specific therapy parameters and safety-critical limits in portable infusion pumps. IC Role / Device Role / Timing Role: Secure parameter vault with hardware WP and STATUS-register BP bits preventing runtime corruption. Use Value: Meets IEC 62304 Class B requirements via deterministic write-disable behavior and 1M endurance. |
| Smart Meter Firmware Config | Automotive Body Control Module |
Use Scenario: Storing tariff schedules, meter ID, and communication settings in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: SPI-configurable memory mapped into MCU's peripheral address space for runtime read/write access. Use Value: 10 MHz interface speed supports rapid configuration loading during wake-from-sleep transitions. |
Use Scenario: Saving seat position memory, mirror angle presets, and door lock configuration in 12 V automotive ECUs. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced to 3.3 V microcontroller with WP tied to ignition-sensed enable line. Use Value: 1.8–5.5 V operation tolerates cold-crank voltage dips; 5 μA standby current extends battery life in parked state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25AA020A-I/SN | Same die, 8-pin SOIC package (3.9 × 4.9 mm); no HOLD pin; larger PCB footprint | Preferred where board space permits and HOLD functionality is unused | Select when legacy layout rework is impractical and 6-pin density is unnecessary |
| AT25020B-SSHL-T | 2 Kbit SPI EEPROM from Microchip (Atmel lineage); 1.8–5.5 V; 8-pin SOIC; no HOLD or WP pins | Lacks hardware write protection and suspend capability - requires software-managed locking | Choose only if WP/HOLD are unused and SOIC compatibility is mandatory for existing designs |
Compared with 25AA020AT-I/OT, the 25AA020A-I/SN offers identical electrical specs but sacrifices HOLD and space efficiency, while AT25020B-SSHL-T omits both WP and HOLD - making 25AA020AT-I/OT the only option supporting concurrent hardware-based write security and interrupt-safe SPI suspension in a 2 mm² footprint.
Availability
25AA020AT-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart meter firmware configuration requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for 25AA020AT-I/OT 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 Inc. is a leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 25AA020A family delivers cost-optimized, low-voltage SPI EEPROMs targeting embedded systems needing reliable, small-footprint nonvolatile storage - designed specifically for configuration, calibration, and parameter retention in resource-constrained environments.
FAQ
What is the operating voltage range of the 25AA020AT-I/OT?
The 25AA020AT-I/OT operates from 1.8 V to 5.5 V across its full industrial temperature range (–40°C to +85°C). This wide supply range allows direct integration with both 1.8 V and 3.3 V microcontrollers without level shifters, and maintains full AC timing compliance - including 10 MHz clock support at VCC ≥ 4.5 V and guaranteed functionality down to 1.8 V.
Does the 25AA020AT-I/OT support page write operations?
Yes, the 25AA020AT-I/OT supports page write mode with a 16-byte buffer. Up to 16 sequential bytes can be loaded before initiating an internal write cycle. Page boundaries align to addresses ending in 0x0F (e.g., 0x00–0x0F, 0x10–0x1F). Crossing a boundary wraps data to the start of the same page - so application firmware must validate address alignment prior to issuing a page write command for 25AA020AT-I/OT.
How does the HOLD pin function on the 25AA020AT-I/OT?
The HOLD pin on the 25AA020AT-I/OT suspends ongoing SPI communication without resetting the sequence. When pulled low while SCK is low, it places SO, SI, and SCK in high-impedance states and ignores further input transitions except CS. To resume, HOLD must be raised while SCK remains low. This enables the host MCU to service higher-priority interrupts and continue exactly where transmission paused - a critical feature for real-time 25AA020AT-I/OT integration.
What protection mechanisms prevent unintended writes to the 25AA020AT-I/OT?
The 25AA020AT-I/OT employs three independent protections: (1) a volatile write-enable latch (WEL) reset on power-up and after every write, (2) a hardware WP pin that disables all writes when low, and (3) nonvolatile BP0/BP1 bits enabling 0%, 25%, 50%, or 100% array block lock. These layers ensure robust immunity against firmware bugs, voltage glitches, or ESD events - verified by >4 kV HBM ESD rating and 1M endurance cycles for 25AA020AT-I/OT.
Is the 25AA020AT-I/OT RoHS compliant and lead-free?
Yes, the 25AA020AT-I/OT is Pb-free and RoHS compliant per EU Directive 2011/65/EU. Its X-rotated TSSOP-6 package uses matte tin (Sn) plating on all terminations, and the marking "e3" appears on outer packaging per JEDEC standards. Microchip confirms full compliance in DS21833G, and the device carries no exemptions - making it suitable for consumer, industrial, and medical applications requiring strict environmental adherence.
25AA020AT-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 10 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:
- SOT-23-6
25AA020AT-I/OT FAQ
1.How can I place an order for 25AA020AT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA020AT-I/OT 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 25AA020AT-I/OT reliable?
The price and inventory of 25AA020AT-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA020AT-I/OT is usually 5 days.
3.What payment methods are accepted for 25AA020AT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA020AT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA020AT-I/OT?
25AA020AT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA020AT-I/OT 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 25AA020AT-I/OT?
For technical support, including 25AA020AT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA020AT-I/OT requirements.
6.How does Aetrix verify that 25AA020AT-I/OT is sourced from the original manufacturer or authorized distributors?
All 25AA020AT-I/OT 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 25AA020AT-I/OT meets industry standards.
7.What is the process for return or replacement of 25AA020AT-I/OT?
All 25AA020AT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 25AA020AT-I/OT, 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 25AA020AT-I/OT part is unused and in its original packaging.
Return procedure for 25AA020AT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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