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Microchip Technology AT25020B-XHL-T
- Part No.:
- AT25020B-XHL-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25020B-XHL-T.pdf
- Description:
- IC EEPROM 2KBIT SPI 20MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
AT25020B-XHL-T from Microchip Technology is a 2 Kbit SPI Serial EEPROM (256 × 8) optimized for low-voltage embedded systems, supporting 1.8V–5.5V operation, industrial temperature range (−40°C to +85°C), and up to 20 MHz clock rate at 5V. It features hardware write protection via WP pin, HOLD suspend functionality, and 8-byte page write mode - deployed in space-constrained IoT sensor nodes and industrial control modules requiring nonvolatile configuration storage.
For engineers reviewing the AT25020B-XHL-T datasheet, AT25020B-XHL-T pinout, AT25020B-XHL-T application, or AT25020B-XHL-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, 5 ms max self-timed write cycle, 1 M write endurance, 100-year data retention, and support for block-level (1/4, 1/2, full) software/hardware write protection.
Technical Context
The AT25020B-XHL-T implements a synchronous SPI slave interface with fixed MSB-first serial protocol, latching input on SCK rising edge and driving output on falling edge. It integrates an 8-bit STATUS register controlling BP1/BP0 block protection bits, WEL write-enable latch, and RDY/BSY status flag - all accessible via RDSR/WRSR opcodes.
Its internal architecture includes high-voltage generation for EEPROM programming, address/data registers, row/column decoders, and power-on reset (POR) circuitry ensuring stable initialization. The HOLD pin suspends serial communication without resetting the instruction sequence, while WP provides hardware-level write inhibition independent of STATUS register state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 words × 8 bits) - supports firmware parameter storage in microcontroller-based edge devices |
| Supply voltage | 1.8 V to 5.5 V - enables direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters |
| Max clock frequency | 20 MHz at VCC = 4.5–5.5 V - allows high-speed configuration reads in real-time control loops |
| Write cycle time | ≤5 ms - ensures predictable latency for critical nonvolatile updates without blocking host CPU |
| Endurance & retention | 1,000,000 write cycles / 100 years data retention at 55°C - meets long-life requirements for industrial field equipment |
| Operating temperature | −40°C to +85°C - qualified for deployment in uncontrolled ambient environments including factory floors |
| ESD rating | >4 kV HBM - provides robustness against handling and system-level electrostatic discharge events |
Pinout & Package
AT25020B-XHL-T is housed in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and halide-free per Microchip's green packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; device ignores SI/SO when high; must follow VCC during power-up |
| SO | Serial Data Output | Tri-state open-drain output; data valid on SCK falling edge; high-impedance when CS high or HOLD active |
| WP | Write-Protect | Hardware lock: drives low to inhibit all write operations regardless of STATUS register or WREN state |
| GND | Ground reference | System ground connection; required for VCC return path and internal voltage regulation stability |
| SI | Serial Data Input | Input for opcodes, addresses, and data; sampled on SCK rising edge; ignored during HOLD assertion |
| SCK | Serial Clock | Master-generated clock; defines timing for SI sampling and SO output; supports idle-high (Mode 3) or idle-low (Mode 0) |
| HOLD | Suspend Serial Input | Pauses ongoing SPI transfer without resetting state machine; SO goes high-Z; SI/SCK ignored until deasserted |
| VCC | Device Power Supply | 1.8–5.5 V supply; POR circuit requires monotonic ramp ≤0.1 V/µs and tPUP ≥100 µs before first command |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 support | Enables interoperability with diverse microcontrollers (e.g., STM32, PIC, ESP32) without protocol translation |
| 8-byte page write mode | Reduces write transaction overhead by allowing burst writes within aligned 8-byte boundaries |
| Block write protection (BP1/BP0) | Configurable 1/4, 1/2, or full array lock via STATUS register - prevents accidental overwrites of calibration data |
| Hardware WP + software WREN | Dual-layer protection: physical pin override complements STATUS-controlled write-enable for fail-safe security |
| Self-timed internal write cycle | Eliminates need for external timing control; host polls RDY/BSY bit or uses tWC = 5 ms worst-case delay |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime reconfiguration; RDY/BSY flag synchronizes host polling during write commits. Use Value: Ensures deterministic startup behavior and preserves settings across 10+ year service life without battery backup. |
Use Scenario: Holding factory-calibrated sensor offsets, gain coefficients, and regulatory compliance flags in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure parameter vault with dual write protection (WP pin + BP bits) preventing unauthorized modification during field servicing. Use Value: Meets IEC 62304 Class B software safety requirements through guaranteed 100-year data integrity and tamper-resistant storage. |
| Smart Energy Meter Firmware Parameters | Automotive Body Control Module Settings |
|
Use Scenario: Storing tariff schedules, metering constants, and cryptographic keys in ANSI C12.22-compliant utility meters exposed to wide temperature swings. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 3.3V MCU; standby current <0.5 µA at 1.8V minimizes battery drain in backup mode. Use Value: Maintains billing accuracy and secure key storage across −40°C to +85°C ambient with no data corruption risk. |
Use Scenario: Saving user preferences (window position, mirror angle), fault logs, and CAN node configuration in 12V automotive subsystems. IC Role / Device Role / Timing Role: SPI slave co-located with MCU; HOLD pin enables safe interruption during CAN bus arbitration windows. Use Value: Enables seamless integration into AEC-Q100-compliant designs via industrial-grade temp range and robust ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DW | 256 Kbit capacity, same 8-lead TSSOP, 20 MHz max, but requires 2.5–5.5 V only - no 1.8 V support | Higher density for multi-parameter logging; unsuitable for 1.8 V-only systems like ultra-low-power sensors | Select when >2 Kbit storage is needed and VCC ≥2.5 V is guaranteed |
| 25AA020A-I/P | Same 2 Kbit density and 1.8–5.5 V range, but DIP-8 package - larger footprint, no surface-mount compatibility | Legacy board upgrades where TSSOP-to-DIP adapter is acceptable; not viable for new compact PCB designs | Choose only for through-hole prototyping or legacy repair; XHL-T offers superior manufacturability |
Compared with M95256-DW and 25AA020A-I/P, AT25020B-XHL-T uniquely balances 1.8 V operation, industrial temperature tolerance, and TSSOP packaging - making it optimal for next-generation space- and power-constrained embedded systems where voltage flexibility and reliability are non-negotiable.
Availability
AT25020B-XHL-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart energy meters, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25020B-XHL-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
The AT25020B-XHL-T belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in resource-constrained industrial and commercial systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25020B-XHL-T?
The AT25020B-XHL-T supports up to 20 MHz at VCC = 4.5–5.5 V, 10 MHz at 2.5–5.5 V, and 5 MHz at 1.8–5.5 V. These limits ensure setup/hold timing compliance across voltage grades. For designs operating at 1.8 V, the 5 MHz ceiling maintains robust signal integrity without requiring additional timing margining.
Does the AT25020B-XHL-T require external pull-up resistors on its SPI lines?
Yes - the AT25020B-XHL-T requires a pull-up resistor (≤10 kΩ) on the CS pin to ensure proper power-up behavior, as specified in Section 2.1 of the datasheet. SO is open-drain and needs a pull-up for valid logic levels; SI, SCK, WP, and HOLD may also benefit from weak pull-ups depending on host driver strength and noise environment.
How does the HOLD function interact with an ongoing write cycle in the AT25020B-XHL-T?
The HOLD function in the AT25020B-XHL-T pauses serial communication but has no effect on an internal write cycle already in progress. If a WRITE command has been issued and the self-timed 5 ms programming sequence has started, asserting HOLD will suspend further SPI commands but will not interrupt the EEPROM cell write - the operation completes autonomously.
Can the AT25020B-XHL-T be used in SPI Mode 1 or Mode 2 configurations?
No - the AT25020B-XHL-T explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in the Features section and Section 5.1 of DS20006251A. Attempting Mode 1 or Mode 2 will result in incorrect data sampling due to mismatched SCK polarity and phase alignment.
What happens to the STATUS register after power cycling the AT25020B-XHL-T?
Upon power-up, the AT25020B-XHL-T initializes the WEL bit to 0 and RDY/BSY to 0 (ready), but retains the nonvolatile BP1/BP0 block protection bits from their pre-power-down state. This behavior is documented in Section 4.6.5 and ensures persistent write protection settings survive power loss without requiring reconfiguration.
AT25020B-XHL-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 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
AT25020B-XHL-T FAQ
1.How can I place an order for AT25020B-XHL-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25020B-XHL-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 AT25020B-XHL-T reliable?
The price and inventory of AT25020B-XHL-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25020B-XHL-T is usually 5 days.
3.What payment methods are accepted for AT25020B-XHL-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25020B-XHL-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25020B-XHL-T?
AT25020B-XHL-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25020B-XHL-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 AT25020B-XHL-T?
For technical support, including AT25020B-XHL-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25020B-XHL-T requirements.
6.How does Aetrix verify that AT25020B-XHL-T is sourced from the original manufacturer or authorized distributors?
All AT25020B-XHL-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 AT25020B-XHL-T meets industry standards.
7.What is the process for return or replacement of AT25020B-XHL-T?
All AT25020B-XHL-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25020B-XHL-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 AT25020B-XHL-T part is unused and in its original packaging.
Return procedure for AT25020B-XHL-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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