My Inquiry
My Account
Microchip Technology AT49LV040-12TI
- Part No.:
- AT49LV040-12TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49LV040-12TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49LV040-12TI from Microchip Technology is a 4-Mbit (512K × 8) parallel-interface, low-voltage CMOS Flash memory IC with 120 ns access time, 3.0–3.6 V supply range, and JEDEC-standard PLCC-32 package. It supports byte-programming and sector-erase operations and is used in embedded firmware storage for industrial controllers.
For engineers reviewing the AT49LV040-12TI datasheet, AT49LV040-12TI pinout, AT49LV040-12TI application, or AT49LV040-12TI equivalent, key selection criteria include access time, voltage compatibility, erase/program cycle endurance, and PLCC-32 footprint integration in legacy 8-bit microcontroller systems.
Technical Context
This device implements a standard NOR Flash architecture with asynchronous parallel bus interface, supporting single-byte write and uniform 4-KB sector erase. It uses internal charge-pump circuitry for programming and erasing without external high-voltage supply.
Command-based operation follows Intel-compatible command set (e.g., 0xAA, 0x55 unlock sequence), and data polling (DQ7) and toggle bit (DQ6) methods are supported for operation completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Mbit (512K × 8 bits); provides sufficient space for boot code and configuration data in 8-bit MCU systems. |
| Access Time | 120 ns max; ensures timing compatibility with legacy 80C51 and Z80-based controllers running at ≤8 MHz. |
| Supply Voltage | 3.0–3.6 V; enables direct interface with 3.3 V logic without level-shifting in mixed-voltage designs. |
| Erase Cycle Endurance | 10,000 cycles per sector; supports field-upgradable firmware in industrial HMI and PLC modules. |
| Data Retention | 20 years at 125°C; meets extended lifetime requirements for automotive-adjacent industrial control units. |
| Programming Time | 100 µs/byte typical; allows efficient in-system firmware patching during maintenance windows. |
Pinout & Package
AT49LV040-12TI is housed in a 32-pin Plastic Leaded Chip Carrier (PLCC-32) with J-lead profile and 1.27 mm pitch. The package is RoHS-compliant and designed for through-hole or surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus selects one of 524,288 bytes; A18 is MSB for full 512K addressing. |
| Q0–Q7 | Data I/O | 8-bit bidirectional data bus; shares pins for read output and program input (no separate DQ lines). |
| CE# | Chip Enable | Active-low enable controls device selection; must be asserted for read, program, or erase operations. |
| OE# | Output Enable | Active-low signal gates data bus output during read; high-Z state prevents bus contention. |
| WE# | Write Enable | Active-low strobe initiates byte programming or sector erase when CE# and OE# are inactive. |
| VCC | Power Supply | 3.3 V nominal supply; decoupling capacitor required within 1 cm of pin for stable operation. |
| VSS | Ground | Reference ground for all digital and core flash operations; requires low-impedance connection to system GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Single 3.3 V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps in 3.3 V embedded systems. |
| JEDEC-Compliant Command Set | Enables drop-in replacement of Intel 28F010/28F020 in existing designs using standard firmware drivers. |
| Hardware Data Protection | Upper and lower 16 KB sectors are permanently protected against accidental erase or program. |
| Automatic Write Timing | Internal timers manage byte-program and sector-erase durations; no external timing circuitry needed. |
| Status Detection via DQ6/DQ7 | Allows real-time monitoring of operation progress without halting CPU execution. |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot Code |
|---|---|
Use Scenario: Storing firmware and calibration tables in DIN-rail mounted programmable logic controllers operating in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into 8-bit microcontroller address space; accessed asynchronously during power-on reset and runtime updates. Use Value: 20-year data retention at 125°C ensures firmware integrity over full product lifecycle without battery backup. | Use Scenario: Holding boot loader and safety-critical initialization routines in Class II medical analyzers certified to IEC 60601-1. IC Role / Device Role / Timing Role: Primary boot memory for Z80-based controller; initialized before RAM test and watchdog setup. Use Value: JEDEC command compatibility allows reuse of validated bootloader code from prior Intel Flash-based platforms. |
| Automotive Diagnostic Tool Memory | Point-of-Sale Terminal Configuration |
Use Scenario: Storing OBD-II protocol stacks and vehicle-specific diagnostic routines in handheld scan tools deployed across multiple OEM models. IC Role / Device Role / Timing Role: Field-upgradable firmware repository; updated via RS-232 or USB-to-serial adapter during service events. Use Value: Sector-erase granularity enables selective update of protocol modules without rewriting entire image. | Use Scenario: Maintaining localized language packs, tax tables, and peripheral driver configurations in retail ECR terminals with limited onboard NVM. IC Role / Device Role / Timing Role: Secondary nonvolatile storage for user-modifiable parameters; accessed only during initialization or admin mode. Use Value: Hardware write protection on top/bottom sectors prevents corruption during power loss during parameter save. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF040-70-4C-NHE | 70 ns access time; 3.0–3.6 V; same PLCC-32 package but SST proprietary command set. | Requires firmware modification for command sequence; not drop-in compatible with Intel-style drivers. | Select if faster access time is critical and software can be adapted. |
| MX29LV040CTTI-12 | 120 ns access time; 3.0–3.6 V; identical pinout and Intel command set compliance. | Direct hardware and software replacement; same sector map and status flag behavior. | Preferred for seamless migration where long-term supply continuity is prioritized. |
Compared with SST39VF040-70-4C-NHE, AT49LV040-12TI offers guaranteed Intel command compatibility for legacy code reuse; compared with MX29LV040CTTI-12, it provides equivalent timing and interface behavior but differs in endurance rating (10k vs. 100k cycles) and manufacturer-specific ECC implementation.
Availability
AT49LV040-12TI is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical devices, and automotive diagnostic tools requiring stable component supply and long-lifecycle support.
Supply support for AT49LV040-12TI 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 U.S.-based semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions for embedded control applications.
The AT49LV040-12TI belongs to Microchip's legacy parallel Flash memory product line, designed specifically for pin- and command-compatible replacement of aging Intel and AMD Flash devices in industrial and medical equipment.
FAQ
What is the maximum operating temperature range for the AT49LV040-12TI?
The AT49LV040-12TI is rated for industrial temperature operation from –40°C to +85°C. This range supports deployment in harsh environments such as factory automation panels and outdoor diagnostic equipment. Its 20-year data retention specification is guaranteed up to +125°C junction temperature, making it suitable for thermally constrained PCB layouts where local heating may exceed ambient ratings. The AT49LV040-12TI maintains full functionality across this range without derating.
Does the AT49LV040-12TI require external high-voltage programming circuitry?
No, the AT49LV040-12TI integrates an internal charge pump that generates all necessary voltages for byte programming and sector erasure from the standard 3.3 V supply. This eliminates the need for external VPP pins or high-voltage generators, simplifying board design and reducing BOM count. The AT49LV040-12TI operates fully within a single 3.0–3.6 V rail, and no auxiliary power sources are required for any internal Flash operation.
How many erase sectors does the AT49LV040-12TI have, and what is their size?
The AT49LV040-12TI contains 64 uniform erase sectors, each 4 KB in size (4096 bytes), totaling 256 KB of erasable space across the 512K-byte array. Two additional 16 KB protection blocks (top and bottom) are hardware-locked and cannot be erased or programmed. This sector layout enables granular firmware updates - for example, updating only the communication stack while preserving boot code - and is directly supported by the AT49LV040-12TI's command set without requiring external address translation logic.
Is the AT49LV040-12TI compatible with 5 V microcontrollers?
The AT49LV040-12TI is not 5 V tolerant: its inputs are specified for 3.0–3.6 V operation only, and applying 5 V signals risks permanent damage. When interfacing with 5 V microcontrollers, level-shifting circuitry (e.g., TXB0104 or discrete MOSFET translators) is mandatory on all address, data, and control lines. The AT49LV040-12TI's output levels meet 3.3 V LVTTL specifications, so proper level translation ensures reliable communication without bus contention or timing violations.
What command sequences are required to initiate a sector erase on the AT49LV040-12TI?
To erase a sector, the AT49LV040-12TI requires a six-cycle Intel-compatible command sequence: write 0xAA to address 0x555, 0x55 to 0x2AA, 0x80 to 0x555, 0xAA to 0x555, 0x55 to 0x2AA, then the sector address to 0x555. After issuing the final address, the device begins erase internally. The AT49LV040-12TI supports both DQ7 data polling and DQ6 toggle bit methods to monitor completion, and no external delay timer is needed due to built-in timing control.
AT49LV040-12TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49LV040-12TI FAQ
1.How can I place an order for AT49LV040-12TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49LV040-12TI 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 AT49LV040-12TI reliable?
The price and inventory of AT49LV040-12TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49LV040-12TI is usually 5 days.
3.What payment methods are accepted for AT49LV040-12TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49LV040-12TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49LV040-12TI?
AT49LV040-12TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49LV040-12TI 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 AT49LV040-12TI?
For technical support, including AT49LV040-12TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49LV040-12TI requirements.
6.How does Aetrix verify that AT49LV040-12TI is sourced from the original manufacturer or authorized distributors?
All AT49LV040-12TI 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 AT49LV040-12TI meets industry standards.
7.What is the process for return or replacement of AT49LV040-12TI?
All AT49LV040-12TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49LV040-12TI, 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 AT49LV040-12TI part is unused and in its original packaging.
Return procedure for AT49LV040-12TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49LV040-12TI 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…
