My Inquiry
My Account
Microchip Technology 25LC040AT-E/SN16KVAO
- Part No.:
- 25LC040AT-E/SN16KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
25LC040AT-E/SN16KVAO.pdf
- Description:
- IC EEPROM 4KBIT SPI 10MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
25LC040AT-E/SN16KVAO from Microchip Technology Inc. is a 4 Kbit SPI Serial EEPROM with 512 × 8-bit organization, 16-byte page write capability, and automotive-grade operation from −40°C to +125°C. It supports up to 10 MHz clock frequency at 4.5–5.5 V, features hardware write protection via WP pin, and delivers 1 million erase/write cycles with >200-year data retention for embedded control storage in engine management systems.
For engineers reviewing the 25LC040AT-E/SN16KVAO datasheet, 25LC040AT-E/SN16KVAO pinout, 25LC040AT-E/SN16KVAO application, or 25LC040AT-E/SN16KVAO equivalent, key selection criteria include automotive temperature compliance (−40°C to +125°C), SPI interface timing at 2.5–5.5 V supply, block-level write protection (BP0/BP1 bits), HOLD functionality for interrupt-safe bus arbitration, and SOIC-8 (SN) package compatibility with legacy PCB footprints.
Technical Context
The 25LC040AT-E/SN16KVAO implements a standard SPI Mode 0,0 or Mode 1,1 interface with separate SI (data in) and SO (data out) lines, requiring CS, SCK, and HOLD control signals. Its internal architecture includes an 8-bit instruction register, page latches, and high-voltage generator for EEPROM programming.
Write operations require explicit WREN instruction followed by CS high to latch enable state; page writes are bounded to 16-byte physical pages (e.g., 0x000–0x00F), with wraparound behavior on boundary crossing. STATUS register (WIP, WEL, BP0, BP1) is readable during writes and controls nonvolatile block protection and write-in-progress status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), sufficient for firmware configuration, calibration tables, or device identity storage in automotive ECUs. |
| Interface | SPI-compatible serial bus (Mode 0,0 / Mode 1,1), enabling direct connection to microcontroller SPI peripherals without protocol translation. |
| Max Clock Frequency | 10 MHz at VCC ≥ 4.5 V, supporting fast read/write throughput in real-time control loops. |
| Write Cycle Time | ≤5 ms per byte or page, enabling deterministic timing for critical parameter updates without blocking host CPU. |
| Endurance & Retention | 1,000,000 erase/write cycles and >200 years data retention, validated for lifetime use in unattended automotive modules. |
| Supply Voltage Range | 2.5 V to 5.5 V, compatible with 3.3 V and 5 V logic domains and tolerant of battery voltage fluctuations in vehicle systems. |
| Temperature Range | −40°C to +125°C (Automotive E grade), qualified for under-hood deployment including engine control units and transmission controllers. |
Pinout & Package
25LC040AT-E/SN16KVAO is packaged in 8-lead SOIC (SN), with lead pitch 1.27 mm and body size 3.9 mm × 4.9 mm. Pin 1 is marked by laser dot; pin 1 location matches JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable signal; must be low for all SPI transactions; rising edge initiates internal write cycle after valid write sequence. |
| SO (Pin 2) | Serial Data Output | Tri-state output delivering memory contents on falling edge of SCK; enters high-Z when CS high or HOLD low. |
| WP (Pin 3) | Write-Protect Pin | Hardware lock: low disables all writes to memory and STATUS register regardless of WEL state; overrides software protection. |
| VSS (Pin 4) | Ground Reference | Primary return path for all I/O and core circuitry; must be connected before VCC during power-up sequencing. |
| SI (Pin 5) | Serial Data Input | Accepts instructions, addresses, and write data on rising edge of SCK; sampled only when CS is low and HOLD is high. |
| SCK (Pin 6) | Serial Clock Input | Master-generated clock synchronizing all SPI transfers; rise/fall times ≤100 ns required for 10 MHz operation. |
| HOLD (Pin 7) | Hold Input | Pauses ongoing SPI transfer without resetting state; requires low-to-high transition while SCK is low to resume communication. |
| VCC (Pin 8) | Supply Voltage | Core power input (2.5–5.5 V); internal regulation enables stable EEPROM operation across wide automotive battery range. |
Key Features
| Feature | Design Value |
|---|---|
| Page Write Mode (16 bytes) | Reduces write latency vs. byte-by-byte programming; enables efficient bulk update of configuration blocks within single 5 ms cycle. |
| Block Write Protection (BP0/BP1) | Four selectable protection levels (none, upper 1/4, upper 1/2, full array) prevent accidental overwrite of critical calibration or security data. |
| Power-On Write Disable | Automatic reset of write enable latch at power-up ensures memory remains read-only until explicitly enabled, eliminating spurious writes during brown-out. |
| HOLD Functionality | Allows host MCU to service higher-priority interrupts mid-transfer without losing SPI context or reinitializing command sequences. |
| ESD Robustness | ≥4 kV HBM rating protects against handling damage and system-level transients in manufacturing and field environments. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write completion under transient voltage conditions and thermal stress. Use Value: Enables regulatory-compliant OBD-II logging and long-term engine learning without external backup power or supercapacitors. | Use Scenario: Retaining camera calibration offsets, radar sensor fusion coefficients, and lane-departure warning thresholds between vehicle power cycles. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfacing directly with ADAS SoC SPI master for secure, tamper-resistant configuration storage. Use Value: Meets AEC-Q100 Grade 1 requirements for reliability and data integrity in safety-critical vision processing subsystems. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Holding user preferences (mirror position, seat memory, lighting profiles) and door lock programming states. IC Role / Device Role / Timing Role: Low-power SPI EEPROM accessed during wake-up sequences to restore personalized settings before CAN bus initialization. Use Value: Achieves <1 µA standby current at 125°C, extending battery life during extended vehicle dormancy periods. | Use Scenario: Storing torque sensor zero-point compensation, motor phase alignment data, and fault history logs for steering assist algorithms. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory co-located with EPS MCU to survive repeated thermal cycling and vibration exposure. Use Value: Supports 1M endurance cycles required for lifetime recalibration events without degradation in steering precision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 25LC040AT-I/SN | Industrial temperature range (−40°C to +85°C); identical electrical specs and pinout. | Not qualified for under-hood automotive use; suitable for cabin electronics or industrial control panels. | Select only if operating ambient stays below +85°C and AEC-Q100 qualification is not required. |
| AT25040B-MAHL-T | Same 4 Kbit SPI EEPROM, but rated for −40°C to +125°C and compliant with AEC-Q100 Grade 1; uses different STATUS register bit mapping. | Requires firmware adaptation for BP bit interpretation and WRSR command timing; pinout matches SOIC-8. | Choose when cross-supplier second sourcing is needed and design can accommodate minor register-level differences. |
Compared with 25LC040AT-I/SN, the 25LC040AT-E/SN16KVAO adds automotive qualification and extended high-temperature operation; versus AT25040B-MAHL-T, it offers native Microchip toolchain support and identical STATUS register behavior, reducing validation effort in PIC-based designs.
Availability
25LC040AT-E/SN16KVAO is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply across automotive production lifecycles.
Supply support for 25LC040AT-E/SN16KVAO 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 company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO/TS 16949 for automotive components.
The 25LC040A product line delivers SPI EEPROMs optimized for automotive and industrial applications demanding high reliability, extended temperature operation, and robust data integrity-designed specifically for ECU configuration, sensor calibration, and safety-critical parameter storage.
FAQ
What is the maximum clock frequency supported by the 25LC040AT-E/SN16KVAO across its full voltage range?
The 25LC040AT-E/SN16KVAO supports up to 10 MHz at VCC = 4.5–5.5 V, 5 MHz at VCC = 2.5–4.5 V, and 3 MHz at VCC = 1.8–2.5 V. Since the 25LC040AT-E/SN16KVAO is specified for 2.5–5.5 V operation, its maximum usable clock is 10 MHz under nominal 5 V supply conditions. This allows high-speed reads during boot-up or diagnostics without compromising timing margins.
Does the 25LC040AT-E/SN16KVAO support page write operations, and what is the page size?
Yes, the 25LC040AT-E/SN16KVAO supports page write mode with a fixed page size of 16 bytes. Each page spans addresses ending in 0x00–0x0F (e.g., 0x000–0x00F, 0x010–0x01F). Writing across a page boundary causes wraparound to the start of the same page, so firmware must enforce alignment. This capability reduces total write time versus sequential byte writes and is fully supported in the 25LC040AT-E/SN16KVAO's instruction set.
How does the WP pin function on the 25LC040AT-E/SN16KVAO, and can it override software write protection?
The WP pin on the 25LC040AT-E/SN16KVAO is a hardware-level write inhibit that disables all writes-including to memory and STATUS register-when held low, regardless of WEL or BP bit states. It cannot be overridden by software commands. This provides fail-safe protection against corruption during power transients or firmware faults, and is active immediately upon assertion, making it essential for safety-critical storage in the 25LC040AT-E/SN16KVAO.
What is the endurance rating and data retention specification for the 25LC040AT-E/SN16KVAO?
The 25LC040AT-E/SN16KVAO is rated for 1,000,000 erase/write cycles and >200 years of data retention at +25°C, with retention validated down to +125°C per Microchip's Total Endurance™ model. These figures are measured and guaranteed-not estimated-and apply directly to the 25LC040AT-E/SN16KVAO under automotive operating conditions, ensuring long-term reliability in engine bay deployments.
Is the 25LC040AT-E/SN16KVAO pin-compatible with other members of the 25XX040A family, such as the 25AA040A?
Yes, the 25LC040AT-E/SN16KVAO shares identical pinout, package (SOIC-8), and SPI interface protocol with all 25XX040A variants, including 25AA040A. However, voltage ranges differ: 25LC040AT-E/SN16KVAO operates from 2.5–5.5 V, while 25AA040A supports 1.8–5.5 V. Firmware and layout are interchangeable, but supply rail design must match the 25LC040AT-E/SN16KVAO's minimum 2.5 V requirement.
25LC040AT-E/SN16KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 10 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
25LC040AT-E/SN16KVAO FAQ
1.How can I place an order for 25LC040AT-E/SN16KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 25LC040AT-E/SN16KVAO 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 25LC040AT-E/SN16KVAO reliable?
The price and inventory of 25LC040AT-E/SN16KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 25LC040AT-E/SN16KVAO is usually 5 days.
3.What payment methods are accepted for 25LC040AT-E/SN16KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 25LC040AT-E/SN16KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 25LC040AT-E/SN16KVAO?
25LC040AT-E/SN16KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 25LC040AT-E/SN16KVAO 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 25LC040AT-E/SN16KVAO?
For technical support, including 25LC040AT-E/SN16KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 25LC040AT-E/SN16KVAO requirements.
6.How does Aetrix verify that 25LC040AT-E/SN16KVAO is sourced from the original manufacturer or authorized distributors?
All 25LC040AT-E/SN16KVAO 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 25LC040AT-E/SN16KVAO meets industry standards.
7.What is the process for return or replacement of 25LC040AT-E/SN16KVAO?
All 25LC040AT-E/SN16KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 25LC040AT-E/SN16KVAO, 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 25LC040AT-E/SN16KVAO part is unused and in its original packaging.
Return procedure for 25LC040AT-E/SN16KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
25LC040AT-E/SN16KVAO 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…
