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Microchip Technology AT25M01-SHM-T
- Part No.:
- AT25M01-SHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25M01-SHM-T.pdf
- Description:
- IC EEPROM 1MBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,932
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Product details
Overview
AT25M01-SHM-T from Microchip Technology is a 1 Mbit SPI Serial EEPROM (131,072 × 8) optimized for low-voltage industrial applications. It operates from 1.7V to 5.5V, supports 20 MHz clock rate at 5V, features 256-byte page write mode, and delivers 1,000,000 write cycles with 100-year data retention - deployed in embedded control firmware storage and sensor calibration data logging.
For engineers reviewing the AT25M01-SHM-T datasheet, AT25M01-SHM-T pinout, AT25M01-SHM-T application, or AT25M01-SHM-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware/software write protection via WP/HOLD pins, industrial temperature range (−40°C to +85°C), green RoHS-compliant 8-lead SOIC package, and self-timed 5 ms max write cycle.
Technical Context
The AT25M01-SHM-T implements a synchronous SPI slave interface with fixed MSB-first serial protocol, supporting both Mode 0 (SCK idle low) and Mode 3 (SCK idle high). Its internal architecture includes a dedicated STATUS register with nonvolatile BP1/BP0 block protection bits, WPEN enable control, and RDY/BSY flag managed by on-chip power-on reset and write-enable latch logic.
Communication is initiated only when CS is asserted low; SI latches data on SCK rising edge, SO drives output on SCK falling edge. The HOLD pin suspends ongoing transfers without resetting sequence state, while WP pin - when enabled - blocks STATUS register writes but not memory reads or active writes already in progress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,048,576 bits (131,072 × 8), organized as byte-addressable serial EEPROM array |
| Supply Voltage Range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifters |
| Max Clock Frequency | 20 MHz at VCC = 4.5–5.5V - supports high-throughput firmware updates and configuration loading |
| Write Cycle Time | ≤5 ms (self-timed) - eliminates need for external polling delay timing in host firmware |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C - validated for long-life industrial deployments |
| Operating Temperature | −40°C to +85°C (industrial grade) - qualified for use in automotive body control modules and factory automation nodes |
| ESD Protection | >4,000V HBM - enhances robustness in handling-sensitive manufacturing and field-replaceable modules |
Pinout & Package
AT25M01-SHM-T is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard JEDEC MS-012AC footprint, 150 mil body width, and Pb-free/RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be driven low before any instruction; ties to MCU GPIO or decoder output; requires pull-up ≤10 kΩ for robust power-up behavior |
| SO | Serial Data Output | Tri-state open-drain output: drives read data on SCK falling edge; high-impedance when CS high or HOLD active |
| WP | Write-Protect | Hardware lock: disables STATUS register writes when low and WPEN=1; allows full memory access otherwise; can be tied to system security rail |
| GND | Ground Reference | Primary return path for VCC and all I/O; must connect to clean system ground plane to minimize noise coupling into SPI lines |
| SI | Serial Data Input | CMOS input: receives opcodes, addresses, and write data on SCK rising edge; accepts 1.7V–5.5V logic levels |
| SCK | Serial Clock Input | Synchronous timing reference: defines bit transfer rate; idle state must match SPI mode (low for Mode 0, high for Mode 3) |
| HOLD | Suspend Control | Pauses active SPI transfer without aborting: asserts during SCK low to freeze SO/SI/SCK interaction; resumes on HOLD deassertion during next SCK low |
| VCC | Power Supply | Single supply input: powers internal charge pump for EEPROM programming; requires local 100 nF ceramic decoupling near pin |
Key Features
| Feature | Design Value |
|---|---|
| 256-byte page write mode | Reduces average write time per byte by 256× vs. byte-write; enables efficient bulk parameter storage in single command |
| Block write protection (1/4, 1/2, full array) | Nonvolatile BP1/BP0 bits in STATUS register prevent accidental overwrite of critical firmware or calibration sectors |
| Dual write protection (WP pin + WRSR instruction) | Combines hardware-level physical lock with software-configurable register control for layered security in certified systems |
| Hold function with zero-cycle resume | Preserves internal state during MCU interrupt servicing; eliminates re-synchronization overhead after pause/resume |
| Low-power standby current (0.2 µA @ 1.7V) | Enables always-on data logging in battery-powered IoT sensors without compromising battery life |
Applications
| Firmware Storage | Sensor Calibration Data |
|---|---|
|
Use Scenario: Storing bootloader code, device configuration tables, and field-upgradable application binaries in microcontroller-based edge nodes. IC Role / Device Role / Timing Role: Nonvolatile program memory extension; accessed via SPI during boot or OTA update sequences. Use Value: Enables secure, field-programmable firmware updates without requiring external parallel NOR/NAND flash or JTAG debug infrastructure. |
Use Scenario: Recording factory-trimmed offset/gain coefficients and temperature compensation curves for analog sensor front-ends. IC Role / Device Role / Timing Role: Persistent calibration repository; written once at production test, read at system startup. Use Value: Maintains measurement accuracy across temperature and lifetime without recalibration; leverages 100-year retention guarantee. |
| Industrial Control Registers | Medical Device Settings |
|
Use Scenario: Holding user-defined PID tuning parameters, alarm thresholds, and operational mode flags in PLC I/O modules. IC Role / Device Role / Timing Role: Configuration scratchpad; updated infrequently via HMI or Modbus interface. Use Value: Survives power loss and cold resets; block protection prevents corruption during brown-out conditions. |
Use Scenario: Storing patient-specific therapy profiles, usage logs, and regulatory audit trails in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant settings vault; accessed under strict access control and write-lock enforcement. Use Value: Meets IEC 62304 data integrity requirements via hardware WP pin + software BP bits + 1M write endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M01-RDW6TP/K | Same 1 Mbit density, 8-pin SOIC, SPI interface; supports 40 MHz max clock at 5V; no HOLD pin; WP pin functional but lacks STATUS register BP bits | Lacks suspend capability and granular block protection; suitable for simpler systems where hold/resume is unnecessary | Select when higher throughput is required and HOLD/WPEN/BP feature set is not needed. |
| BR24M10FJ-WE2 | I²C interface (not SPI); 1 Mbit density; 8-pin SOP; supports 1 MHz max clock; built-in write protect via A0/A1 pins; no HOLD function | Requires I²C master instead of SPI; incompatible bus protocol; lower speed; no suspend or status-register-based protection | Choose only if system already uses I²C infrastructure and SPI resource is unavailable. |
Compared with M95M01-RDW6TP/K and BR24M10FJ-WE2, AT25M01-SHM-T uniquely combines SPI Mode 0/3 flexibility, HOLD suspend, and nonvolatile BP1/BP0 block protection - making it optimal for complex embedded systems requiring robust, interruptible, and securely partitioned EEPROM access.
Availability
AT25M01-SHM-T is available at Aetrix Electronics and suitable for industrial control firmware storage, medical device configuration management, and automotive sensor calibration data logging requiring stable component supply and long-term lifecycle support.
Supply support for AT25M01-SHM-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 Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with global design centers and ISO 9001-certified manufacturing.
The AT25M01-SHM-T belongs to Microchip's AT25 family of SPI EEPROMs, engineered for reliable, low-voltage, industrial-grade nonvolatile storage in space-constrained embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25M01-SHM-T?
The AT25M01-SHM-T supports up to 20 MHz at VCC = 4.5–5.5V, 10 MHz at VCC = 2.5–5.5V, and 5 MHz at VCC = 1.7–5.5V. These limits ensure setup/hold timing compliance across voltage grades. The actual achievable rate depends on PCB layout, signal integrity, and master controller drive strength - verified using AC characteristics Table 4-3 in the official datasheet.
Does the AT25M01-SHM-T support both SPI Mode 0 and Mode 3?
Yes, the AT25M01-SHM-T explicitly supports SPI Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1). In both modes, data is latched on the SCK rising edge and output on the falling edge. The key requirement is matching SCK idle polarity before and after CS assertion - Mode 0 requires idle low, Mode 3 requires idle high.
How does the HOLD pin function during an active write cycle in the AT25M01-SHM-T?
The HOLD pin has no effect on an ongoing internal write cycle in the AT25M01-SHM-T. It only suspends serial communication (SI/SO/SCK interaction) while CS remains asserted. If a WRITE command has already triggered the self-timed 5 ms erase/write sequence, HOLD will pause data transfer but not halt the EEPROM programming operation itself.
What write protection mechanisms are implemented in the AT25M01-SHM-T?
The AT25M01-SHM-T provides three-layer write protection: (1) hardware WP pin that disables STATUS register writes when low and WPEN=1; (2) software-configurable BP1/BP0 bits in the STATUS register for 1/4, 1/2, or full array block protection; and (3) WREN/WRDI instructions controlling the volatile Write Enable Latch (WEL) bit required for all memory writes.
Is the AT25M01-SHM-T compatible with 1.8V microcontrollers?
Yes, the AT25M01-SHM-T operates down to 1.7V VCC and accepts input logic levels referenced to its own VCC, enabling direct connection to 1.8V MCUs without level translation. DC and AC timing parameters (e.g., tSU, tH, fSCK) are fully specified at 1.7V–5.5V, and input thresholds scale with VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC).
AT25M01-SHM-T 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:
- Not 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:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25M01-SHM-T FAQ
1.How can I place an order for AT25M01-SHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25M01-SHM-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 AT25M01-SHM-T reliable?
The price and inventory of AT25M01-SHM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25M01-SHM-T is usually 5 days.
3.What payment methods are accepted for AT25M01-SHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25M01-SHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25M01-SHM-T?
AT25M01-SHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25M01-SHM-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 AT25M01-SHM-T?
For technical support, including AT25M01-SHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25M01-SHM-T requirements.
6.How does Aetrix verify that AT25M01-SHM-T is sourced from the original manufacturer or authorized distributors?
All AT25M01-SHM-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 AT25M01-SHM-T meets industry standards.
7.What is the process for return or replacement of AT25M01-SHM-T?
All AT25M01-SHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25M01-SHM-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 AT25M01-SHM-T part is unused and in its original packaging.
Return procedure for AT25M01-SHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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