My Inquiry
My Account
Microchip Technology 25AA1024T-I/SM
- Part No.:
- 25AA1024T-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
25AA1024T-I/SM.pdf
- Description:
- IC EEPROM 1MBIT SPI 20MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
25AA1024T-I/SM from Microchip Technology Inc. is a 1-Mbit (131,072-byte) SPI serial EEPROM with byte/page write capability, 256-byte page size, 6 ms max internal write cycle time, and industrial temperature range (–40°C to +85°C). It operates from 1.8V to 5.5V, supports up to 20 MHz clock at 4.5–5.5V, and features hardware write protection via WP pin and STATUS register control.
For engineers reviewing the 25AA1024T-I/SM datasheet, 25AA1024T-I/SM pinout, 25AA1024T-I/SM application, or 25AA1024T-I/SM equivalent, this device serves as a drop-in nonvolatile memory for microcontroller-based systems requiring reliable data logging, configuration storage, or firmware parameter retention in space-constrained industrial and automotive designs.
Technical Context
The 25AA1024T-I/SM implements a true SPI Mode 0,0/Master-Slave interface with separate SI (data in) and SO (data out) lines, CS-controlled selection, and HOLD pin for transaction suspension without reset. Its internal architecture includes an 8-bit instruction register, page latches, HV generator for EEPROM programming, and status register with WIP, WEL, BP0/BP1, and WPEN bits.
It supports four erase granularities-byte/page write (no pre-erase), page erase (6 ms), sector erase (10 ms), and chip erase (10 ms)-all self-timed and interruptible only by CS deassertion. Write protection is configurable per 32 KB sector (0%, 25%, 50%, or 100% array lock) and enforced by both software (WRSR) and hardware (WP pin + WPEN bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 bytes), organized as 256-byte pages × 512 pages - enables efficient bulk writes without external buffering |
| Interface | SPI-compatible serial bus (Mode 0,0), with dedicated SI/SO lines - eliminates need for bidirectional data bus arbitration |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5V - supports high-speed read/write in performance-critical host MCU environments |
| Write Cycle Time | 6 ms maximum for byte or page write - defines minimum interval between successive write commands |
| Endurance & Retention | 1 million erase/write cycles; >200 years data retention - ensures long-term reliability in infrequently updated configuration storage |
| Supply Voltage Range | 1.8V to 5.5V - allows direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters |
| Deep Power-down Current | 1 µA at 2.5V, 85°C - reduces system standby power in battery-backed or energy-harvesting applications |
Pinout & Package
25AA1024T-I/SM uses an 8-lead SOIJ (Small Outline Integrated Circuit, J-bend) package with 1.27 mm pitch, RoHS-compliant, and rated for industrial temperature operation (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Active-low enable signal; deselects device and forces SO into high-impedance state for multi-device SPI bus sharing |
| SO | Serial Data Output | Unidirectional output; data shifted out on falling edge of SCK - avoids contention during full-duplex reads |
| WP | Write-Protect Pin | Hardware lock for STATUS register when WPEN = 1; low = block nonvolatile STATUS writes, high = full access |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling |
| SI | Serial Data Input | Unidirectional input; instructions, addresses, and data latched on rising edge of SCK - decouples timing from SO transitions |
| SCK | Serial Clock Input | Master-generated clock synchronizing all SPI transactions; rise/fall times ≤20 ns required for 20 MHz operation |
| HOLD | Hold Input | Pauses ongoing SPI sequence without resetting address pointer; allows host MCU to service higher-priority interrupts |
| VCC | Supply Voltage | Power rail for core logic and EEPROM array; supports wide 1.8–5.5V range enabling flexible system-level voltage design |
Key Features
| Feature | Design Value |
|---|---|
| Page-level write (256 bytes) | Enables burst writes within single physical page boundary - reduces host firmware overhead vs. byte-by-byte writes |
| Four-sector write protection | Configurable lock of 0%, 25%, 50%, or 100% of memory (32 KB sectors) - prevents accidental overwrite of critical calibration or boot code |
| Deep Power-down mode | 1 µA standby current with full write disable - provides hardware-enforced data integrity during extended sleep or brown-out conditions |
| Electronic signature (RDID) | Unique 16-bit manufacturer ID (0x1F 0x84) readable after DPD exit - enables automated BOM verification and counterfeit detection |
| AEC-Q100 qualified | Qualified for automotive applications per AEC-Q100 Rev G Grade 2 (–40°C to +105°C ambient) - validates robustness for under-hood use |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via SPI during boot and runtime reconfiguration; retains values across power cycles. Use Value: Eliminates need for external backup batteries or supercapacitors while supporting 1M+ field updates over product lifetime. |
Use Scenario: Holding engine trim tables, sensor offset corrections, and adaptive learning values in engine control units operating under hood temperatures. IC Role / Device Role / Timing Role: High-reliability data logger interfaced to 32-bit automotive MCUs; survives thermal cycling and vibration per AEC-Q100 requirements. Use Value: Enables zero-latency read access during real-time control loops and guarantees >200-year data retention without refresh. |
| Medical Device Parameter Backup | Smart Meter Firmware Metadata |
Use Scenario: Preserving user-adjustable therapy settings, calibration history, and audit logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware write protection activated during clinical mode to prevent unauthorized changes. Use Value: Meets IEC 62304 Class C software safety requirements through deterministic write timing and deep power-down isolation. |
Use Scenario: Storing firmware version stamps, cryptographic keys, and tariff schedule timestamps in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Trusted root-of-trust companion to secure MCU; stores immutable metadata validated before each firmware update. Use Value: Prevents rollback attacks via sector-lockable memory regions and supports FIPS 140-2 Level 1 cryptographic key management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4 Mbit density, quad SPI interface, no HOLD pin, 8-pin SOIC package | Higher capacity but lacks HOLD functionality and hardware write-protection granularity | Choose for larger firmware storage where transaction suspension is unnecessary and quad speed is prioritized |
| BR25H100MWZ-RE | 1 Mbit, SPI interface, 1.6–5.5V supply, built-in error correction (ECC), 8-pin TSSOP | ECC corrects single-bit errors; lower min VCC enables direct 1.8V MCU interfacing without regulator | Prefer for mission-critical systems requiring enhanced data integrity in noisy industrial environments |
Compared with AT25DF041A-SSH-T and BR25H100MWZ-RE, the 25AA1024T-I/SM delivers precise 256-byte page alignment, industrial-grade HOLD functionality for deterministic interrupt handling, and fine-grained 32 KB sector protection - making it optimal for deterministic embedded control where timing predictability and hardware-enforced security outweigh raw density or ECC needs.
Availability
25AA1024T-I/SM is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical devices, smart meters, and IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 25AA1024T-I/SM 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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 25AA1024T-I/SM belongs to Microchip's legacy SPI EEPROM product line, designed specifically for cost-sensitive, high-reliability embedded systems requiring simple, proven nonvolatile storage with minimal firmware overhead and robust industrial qualification.
FAQ
What is the maximum clock frequency supported by the 25AA1024T-I/SM?
The 25AA1024T-I/SM supports up to 20 MHz clock frequency when VCC is 4.5V to 5.5V, 10 MHz at 2.5V to 4.5V, and 2 MHz at 2.0V to 2.5V. These limits are defined in Table 1-2 of the official DS20001836K datasheet and reflect actual AC timing validation across voltage and temperature ranges. The 25AA1024T-I/SM must meet these specifications to ensure reliable SPI communication without setup/hold violations.
Does the 25AA1024T-I/SM require external erase before writing new data?
No, the 25AA1024T-I/SM does not require external erase before byte or page write operations. Its internal architecture performs automatic self-timed erase as part of each write cycle. Erase instructions (PE, SE, CE) are optional and used only when bulk clearing is needed - for example, to reset protected sectors or prepare for firmware updates. The 25AA1024T-I/SM handles all erase/write sequencing internally.
How does hardware write protection work on the 25AA1024T-I/SM?
Hardware write protection on the 25AA1024T-I/SM requires both the WP pin held low *and* the WPEN bit set high in the STATUS register. When active, it disables writes to nonvolatile STATUS bits only - all other functions (read, write, erase) remain operational. If WPEN = 0, the WP pin is ignored, allowing full STATUS register access even with WP grounded. This dual-control mechanism ensures flexibility during programming and robust lock-down in field operation.
What is the purpose of the HOLD pin on the 25AA1024T-I/SM?
The HOLD pin on the 25AA1024T-I/SM suspends ongoing SPI communication without resetting the internal address pointer or command state. When pulled low while SCK is low, it places the device in hold mode: SI and SCK transitions are ignored, SO goes high-impedance, and the host MCU can service urgent interrupts. Resuming with HOLD high (while SCK is low) continues the exact same transaction. This behavior is fully specified in Section 2.6 of the 25AA1024T-I/SM datasheet and is critical for deterministic real-time systems.
Is the 25AA1024T-I/SM compatible with standard SPI Mode 0,0?
Yes, the 25AA1024T-I/SM is fully compatible with SPI Mode 0,0 (CPOL = 0, CPHA = 0): data is sampled on the rising edge of SCK and changed on the falling edge. Its SI input latches on SCK rising edge, and SO output updates after SCK falling edge - matching standard SPI master timing. This compatibility is confirmed in Figure 1-2 and Figure 1-3 of the DS20001836K datasheet and verified across all supported VCC and temperature ranges for the 25AA1024T-I/SM.
25AA1024T-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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-SOIJ
25AA1024T-I/SM FAQ
1.How can I place an order for 25AA1024T-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 25AA1024T-I/SM 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 25AA1024T-I/SM reliable?
The price and inventory of 25AA1024T-I/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25AA1024T-I/SM is usually 5 days.
3.What payment methods are accepted for 25AA1024T-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25AA1024T-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25AA1024T-I/SM?
25AA1024T-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25AA1024T-I/SM 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 25AA1024T-I/SM?
For technical support, including 25AA1024T-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25AA1024T-I/SM requirements.
6.How does Aetrix verify that 25AA1024T-I/SM is sourced from the original manufacturer or authorized distributors?
All 25AA1024T-I/SM 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 25AA1024T-I/SM meets industry standards.
7.What is the process for return or replacement of 25AA1024T-I/SM?
All 25AA1024T-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 25AA1024T-I/SM, 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 25AA1024T-I/SM part is unused and in its original packaging.
Return procedure for 25AA1024T-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25AA1024T-I/SM Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
