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Microchip Technology AT25040A-10TU-1.8-T
- Part No.:
- AT25040A-10TU-1.8-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT25040A-10TU-1.8-T.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,796
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Product details
Overview
AT25040A-10TU-1.8-T from Microchip Technology (formerly Atmel) is a 4-Kbit SPI serial EEPROM organized as 512 words × 8 bits, operating from 1.8 V to 5.5 V with 20 MHz clock rate at 5 V, 8-byte page write capability, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules.
For engineers reviewing the AT25040A-10TU-1.8-T datasheet, AT25040A-10TU-1.8-T pinout, AT25040A-10TU-1.8-T application, or AT25040A-10TU-1.8-T equivalent, key selection criteria include 1.8 V minimum supply, TSSOP-8 package footprint, SPI Mode 0/3 compatibility, block write protection granularity, and 1 million endurance cycles.
Technical Context
The AT25040A-10TU-1.8-T implements a synchronous SPI slave interface with separate SI/SO lines, CS-controlled selection, and HOLD pin for serial communication suspension without reset. Its internal architecture includes an 8-bit instruction register, status register with BP1/BP0 for 1/4–full array protection, and automatic address increment during page reads.
Write operations require WREN instruction followed by WRITE command; self-timed internal write cycle completes in ≤5 ms. The device supports two voltage ranges (1.8–5.5 V and 2.7–5.5 V), with DC characteristics fully specified across −40°C to +85°C, and AC timing validated for fSCK up to 20 MHz at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8), sufficient for firmware parameter tables or calibration data in compact embedded systems |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V logic and compatibility with 3.3 V/5 V host MCUs |
| Max Clock Frequency | 20 MHz at VCC = 5 V - supports high-throughput configuration loading in time-critical boot sequences |
| Page Write Size | 8 bytes - minimizes write latency per transaction while limiting bus occupancy during field updates |
| Endurance | 1 million write cycles - ensures reliable reprogramming over product lifetime in remote sensor nodes |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of stored calibration coefficients or security keys |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation, automotive body electronics, and outdoor metering |
Pinout & Package
AT25040A-10TU-1.8-T is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 0.170" wide, RoHS-compliant, with gull-wing leads and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be low to accept instructions; high-Z SO when CS high |
| SCK | Serial Clock | Input-only master-generated clock; defines SPI timing edges for SI/SO sampling |
| SI | Serial Data Input | MOSI line for op-codes, addresses, and write data; MSB-first transmission required |
| SO | Serial Data Output | MISO line for read data and status register contents; tri-stated when CS high or HOLD active |
| GND | Ground Reference | Primary return path for VCC current and signal reference; requires low-impedance PCB connection |
| VCC | Power Supply | Single-supply input supporting 1.8–5.5 V; decoupling capacitor mandatory near pin |
| WP | Write Protect | Hardware lock: low disables all writes regardless of WREN status; overrides software protection |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low before assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 & 3 Support | Interoperates with diverse MCU families (e.g., PIC, STM32, NXP Kinetis) without protocol translation |
| Block Write Protection | Four configurable protection levels (none, 1/4, 1/2, full array) via nonvolatile BP1/BP0 bits |
| Hardware + Software Write Lock | WP pin provides physical override; WREN/WRDI instructions enable dynamic protection control |
| Self-timed Write Cycle | No external timing circuitry needed; internal state machine manages erase/write/verify in ≤5 ms |
| HOLD Pin Functionality | Enables multi-master arbitration or CPU context switching without losing SPI state or address pointer |
Applications
| Industrial PLC I/O Module | Smart Energy Meter |
|---|---|
Use Scenario: Storing calibrated ADC offset/gain values and channel-specific scaling factors across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during system initialization and runtime calibration routines. Use Value: Ensures measurement accuracy remains consistent after brownouts or firmware updates without factory recalibration. |
Use Scenario: Retaining tariff schedules, billing counters, and tamper-event logs in utility-grade meters. IC Role / Device Role / Timing Role: Secure, long-life data logger with write-protection against unauthorized parameter changes. Use Value: Meets IEC 62056 requirements for 100-year data retention and 1M-cycle endurance under frequent logging. |
| Automotive Body Control Unit | Medical Infusion Pump |
Use Scenario: Saving user preferences (lighting profiles, mirror positions) and fault history in 12 V vehicle systems with LDO-regulated 3.3 V rail. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to CAN-connected MCU with minimal external components. Use Value: Operates reliably down to 1.8 V during cold-crank conditions; TSSOP-8 footprint fits tight PCB layouts. |
Use Scenario: Storing drug library parameters, dose limits, and audit trail records compliant with FDA 21 CFR Part 11. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with hardware write lock to prevent accidental overwrite of safety thresholds. Use Value: WP pin enables deterministic hardware-enforced protection independent of software state or power glitches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN6TP/K | 4-Kbit SPI EEPROM, 1.8–5.5 V, TSSOP-8, but rated only to 10 MHz max clock at 1.8 V | Lacks HOLD pin; no suspend functionality - unsuitable where multi-master arbitration is required | Select when cost sensitivity outweighs need for HOLD or 20 MHz operation at 5 V |
| BR24G04FJ-WE2 | 4-Kbit I²C EEPROM, 1.7–5.5 V, TSSOP-8, 400 kHz standard mode, 1 MHz fast mode | I²C interface requires only two wires but introduces arbitration overhead and lacks native page-suspend capability | Prefer for space-constrained designs already using I²C bus; avoid if SPI-native host or HOLD functionality is mandatory |
Compared with M95040-DRMN6TP/K and BR24G04FJ-WE2, the AT25040A-10TU-1.8-T delivers higher SPI throughput, deterministic HOLD-based pause/resume, and broader voltage-margin timing - critical for real-time embedded control where bus efficiency and deterministic latency matter.
Availability
AT25040A-10TU-1.8-T is available at Aetrix Electronics and suitable for industrial control systems, smart metering infrastructure, automotive body electronics, and medical device configuration storage requiring stable component supply and long-term lifecycle support.
Supply support for AT25040A-10TU-1.8-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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT25xxx family of serial EEPROMs.
The AT25040A-10TU-1.8-T belongs to Microchip's legacy serial EEPROM product line, designed specifically for robust, low-power, SPI-based nonvolatile storage in industrial and automotive environments where reliability and wide voltage operation are essential.
FAQ
What is the maximum clock frequency supported by AT25040A-10TU-1.8-T at 1.8 V?
The AT25040A-10TU-1.8-T supports up to 5 MHz SCK frequency when operating at 1.8 V, as specified in Table 4 AC Characteristics under the 1.8–5.5 V column. This ensures reliable timing margins for low-voltage microcontrollers while maintaining compatibility with higher-speed hosts via voltage scaling.
Does AT25040A-10TU-1.8-T support SPI Mode 1 or Mode 2?
No. The AT25040A-10TU-1.8-T explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as stated in the Features section. Modes 1 and 2 are not implemented and will result in communication failure or undefined behavior.
How does the HOLD pin function during an active write cycle?
The HOLD pin has no effect during an internal write cycle (tWC). Once the write is initiated by CS rising edge, the device ignores HOLD until the write completes and RDY bit clears. HOLD is only functional during active read/write instruction sequences prior to CS deassertion.
Can AT25040A-10TU-1.8-T be used in automotive applications?
Yes - the AT25040A-10TU-1.8-T is qualified for industrial temperature range (−40°C to +85°C) and listed in the datasheet as having automotive devices available. While not AEC-Q100 certified out-of-box, its electrical and thermal specs meet common automotive subsystem requirements when used within controlled environments.
What happens if the WP pin is pulled low during a WREN instruction?
If WP is low during WREN execution, the AT25040A-10TU-1.8-T ignores the instruction and remains in write-disabled state. The WREN command requires WP = high to set the WEN bit; this hardware dependency prevents accidental enablement even if software issues the command erroneously.
AT25040A-10TU-1.8-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:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 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
AT25040A-10TU-1.8-T FAQ
1.How can I place an order for AT25040A-10TU-1.8-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040A-10TU-1.8-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 AT25040A-10TU-1.8-T reliable?
The price and inventory of AT25040A-10TU-1.8-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040A-10TU-1.8-T is usually 5 days.
3.What payment methods are accepted for AT25040A-10TU-1.8-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040A-10TU-1.8-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040A-10TU-1.8-T?
AT25040A-10TU-1.8-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040A-10TU-1.8-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 AT25040A-10TU-1.8-T?
For technical support, including AT25040A-10TU-1.8-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040A-10TU-1.8-T requirements.
6.How does Aetrix verify that AT25040A-10TU-1.8-T is sourced from the original manufacturer or authorized distributors?
All AT25040A-10TU-1.8-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 AT25040A-10TU-1.8-T meets industry standards.
7.What is the process for return or replacement of AT25040A-10TU-1.8-T?
All AT25040A-10TU-1.8-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25040A-10TU-1.8-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 AT25040A-10TU-1.8-T part is unused and in its original packaging.
Return procedure for AT25040A-10TU-1.8-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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