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Microchip Technology AT49BV040B-TU
- Part No.:
- AT49BV040B-TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040B-TU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49BV040B-TU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) in-system reprogrammable Flash memory IC designed for embedded firmware storage and boot code retention. It operates from a single 2.7V–3.6V or 4.5V–5.5V supply, delivers 70 ns read access at 3.3V and 55 ns at 5V, supports byte-by-byte programming (10 µs/byte), and integrates hardware data protection with boot sector lockout. It is used in industrial controllers requiring field-upgradable firmware with secure boot integrity.
For engineers reviewing the AT49BV040B-TU datasheet, AT49BV040B-TU pinout, AT49BV040B-TU application, or AT49BV040B-TU equivalent, key selection criteria include its dual-voltage operation, sector-erasable architecture (1×16KB boot + 2×8KB parameter + 8×64KB main), CMOS standby current (25 µA @ 3.3V), and compatibility with standard EPROM-like interface timing (CE/OE/WE control).
Technical Context
The AT49BV040B-TU implements a command-register-based Flash architecture with internal program/erase control logic and no external high-voltage programming requirement. Its memory array is partitioned into eleven independently erasable sectors - one 16 KB boot sector with optional permanent lockout, two 8 KB parameter sectors, and eight main sectors (one 32 KB + seven 64 KB) - enabling granular firmware updates without full-chip erase.
It supports three end-of-operation detection methods: DATA polling (I/O7 complement/valid toggle), Toggle Bit (I/O6 toggling), and Erase/Program Status Bit (I/O5). All command sequences (Chip Erase, Sector Erase, Byte Program, Boot Lockout Enable) use six- or four-cycle address/data latching on WE/CE edges per JEDEC-compliant timing windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 4 Mbit (524,288 × 8 bits); sufficient for medium-complexity boot loaders and configuration tables. |
| Read Access Time | 70 ns @ VCC = 2.7–3.6 V; 55 ns @ VCC = 4.5–5.5 V - matches SRAM-like timing for legacy microcontroller bus interfaces. |
| Byte Programming Time | 10 µs typical - enables fast incremental firmware patching without system interruption. |
| Sector Erase Time | 900 ms typical for main sectors - allows targeted update of application code while preserving boot and parameter data. |
| Endurance | ≥100,000 program/erase cycles - validated for long-life industrial deployment with frequent field updates. |
| Standby Current | 25 µA @ 2.7–3.6 V; 30 µA @ 4.5–5.5 V - supports low-power sleep modes in battery-backed systems. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded environments. |
Pinout & Package
AT49BV040B-TU is supplied in a 32-lead Thin Small Outline Package (TSOP, Type I, package code 32T), measuring 20 mm × 8 mm × 1.2 mm, compliant with JEDEC MO-142 BD. Pin 1 is marked by a notch or beveled corner; the package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A0 used for command decoding (e.g., 555H, AAH). |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; carries command data (e.g., A0H for byte program), product ID codes (1FH/13H), and user data. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read; latches address/data during command sequences. |
| OE | Output Enable | Active-low output control; enables data bus drivers during read; high during programming/erasing to prevent contention. |
| WE | Write Enable | Active-low write strobe; controls latching of command data and initiates internal program/erase cycles when CE is also low. |
| VCC | Power Supply | Single 2.7–3.6 V or 4.5–5.5 V supply; internal voltage regulation enables consistent timing across both ranges. |
| GND | Ground Reference | Signal and power ground; decoupling capacitor required near VCC pin for stable operation during erase pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Sector Architecture | Enables selective firmware updates: boot sector (16 KB) can be permanently locked; parameter sectors (2×8 KB) store calibration data; main sectors (up to 7×64 KB) hold application code. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) prevent accidental corruption. |
| Boot Sector Programming Lockout | Once enabled via six-command sequence, the 00000H–03FFFH region becomes immutable - ensuring bootloader integrity during field upgrades of other sectors. |
| Multiple End-of-Operation Detection | DATA polling (I/O7), Toggle Bit (I/O6), and Status Bit (I/O5) allow host software to poll asynchronously without fixed timeout delays, improving system responsiveness. |
| EPROM-Compatible Interface | Uses standard CE/OE/WE control signals and timing - eliminates need for custom glue logic when replacing older EPROMs in legacy designs. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability; provides deterministic 70 ns read access for real-time scan cycle execution. Use Value: Enables remote firmware patches without hardware replacement; boot sector lockout prevents corruption of safety-critical startup routines during updates. | Use Scenario: Holding certified bootloader code in Class II medical infusion pumps requiring regulatory-compliant firmware validation and version control. IC Role / Device Role / Timing Role: Secure boot memory with write-protection enforcement; operates reliably over −40°C to +85°C for clinical environment stability. Use Value: Guarantees bootloader immutability post-certification; parameter sectors store device-specific calibration data that survives main firmware updates. |
| Telecom Base Station Configuration | Automotive Diagnostic Module Storage |
Use Scenario: Storing configuration profiles and protocol stacks in LTE small-cell base stations subject to frequent network operator updates. IC Role / Device Role / Timing Role: Field-upgradable flash memory interfaced to ARM Cortex-A series processors via standard parallel bus. Use Value: Sector-erase capability allows rapid update of radio stack binaries without disrupting boot or security keys stored in protected regions. | Use Scenario: Retaining OBD-II diagnostic firmware and vehicle-specific calibration maps in automotive aftermarket scan tools. IC Role / Device Role / Timing Role: In-system reprogrammable nonvolatile memory operating from 5 V vehicle power rail with robust ESD immunity. Use Value: Dual-voltage support (4.5–5.5 V) ensures stable operation during cranking transients; 100,000-cycle endurance supports multi-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns access, 3.0–3.6 V only; no 5 V operation; lacks boot sector lockout command set. | Requires separate 3.3 V regulator; unsuitable where 5 V legacy bus compatibility is needed. | Select if system uses only 3.3 V and prioritizes lower cost over dual-voltage flexibility and boot protection. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 2.7–3.6 V; includes CFI query support and top/bottom boot configuration; no 5 V mode. | CFI compliance simplifies auto-detection in BIOS/bootloader; boot sector orientation differs (top vs. bottom). | Prefer when integrating with CFI-aware firmware stacks or where top-boot architecture better matches system memory map. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040B-TU uniquely supports both 3.3 V and 5 V operation with hardware-enforced boot sector lockout - critical for mixed-voltage industrial systems requiring guaranteed bootloader integrity across voltage domains.
Availability
AT49BV040B-TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader retention, telecom base station configuration, and automotive diagnostic module storage requiring stable component supply and long-term lifecycle assurance.
Supply support for AT49BV040B-TU 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 support for legacy Atmel Flash products including the AT49BV040B series. The company specializes in microcontrollers, analog, Flash, and security ICs for industrial, automotive, and consumer markets.
The AT49BV040B belongs to Atmel's BV-series low-voltage Flash memory family, engineered for in-system reprogrammability in resource-constrained embedded systems where reliable boot code persistence and field-upgradable firmware are essential design requirements.
FAQ
What voltage ranges does the AT49BV040B-TU support for reliable operation?
The AT49BV040B-TU supports two distinct VCC operating ranges: 2.7 V to 3.6 V and 4.5 V to 5.5 V. It does not operate reliably between 3.6 V and 4.5 V. Within each range, it guarantees 70 ns read access at 3.3 V and 55 ns at 5 V, with corresponding active currents of 20 mA and standby currents of 25 µA (3.3 V) or 30 µA (5 V). The AT49BV040B-TU includes VCC-sense circuitry that disables programming if supply drops below ~1.8 V.
How is the boot sector protected from accidental reprogramming in the AT49BV040B-TU?
The AT49BV040B-TU implements a six-command software lockout sequence (555H/AAH → AAAH/55H → 555H/80H → 555H/AAH → AAAH/55H → 555H/40H) to permanently disable programming and erasure of the 16 KB boot sector (00000H–03FFFH). Once enabled, the lock cannot be reversed. Software detection reads I/O0 at address 00002H: low = unlocked, high = locked. This feature is optional and inactive by default. The AT49BV040B-TU enforces this protection at the hardware level.
What are the valid package types for the AT49BV040B-TU ordering code?
The "-TU" suffix in AT49BV040B-TU specifically denotes the 32-lead Thin Small Outline Package (TSOP, Type I), per JEDEC MO-142 BD, with dimensions 20 mm × 8 mm × 1.2 mm. Other variants include "-JU" (32-lead PLCC) and "-VU" (32-lead VSOP). All share identical electrical specifications and pinout but differ mechanically. The AT49BV040B-TU is RoHS-compliant and halide-free, with lead finish specified as matte tin.
Can the AT49BV040B-TU be used as a direct replacement for standard EPROMs like the 27C040?
Yes - the AT49BV040B-TU uses identical pinout, CE/OE/WE control signaling, and read timing to EPROMs such as the 27C040, enabling drop-in replacement in existing sockets. However, unlike EPROMs, it requires no UV erasure or external 12 V programming voltage. Programming is performed in-system using standard 3.3 V or 5 V levels and command sequences. The AT49BV040B-TU retains data for >20 years and supports >100,000 cycles, far exceeding EPROM endurance.
What methods does the AT49BV040B-TU provide to detect completion of program or erase operations?
The AT49BV040B-TU offers three hardware-supported detection methods: (1) DATA polling - reading the programmed byte returns its complement until completion, then true data; (2) Toggle Bit - I/O6 toggles between 0 and 1 during operation and stops upon completion; (3) Erase/Program Status Bit - I/O5 goes high if internal pulse limits are exceeded, indicating failure. All methods allow host software to avoid fixed timeouts. The AT49BV040B-TU documentation specifies algorithms combining these bits for robust detection.
AT49BV040B-TU 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:
- 120µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49BV040B-TU FAQ
1.How can I place an order for AT49BV040B-TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040B-TU 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 AT49BV040B-TU reliable?
The price and inventory of AT49BV040B-TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040B-TU is usually 5 days.
3.What payment methods are accepted for AT49BV040B-TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040B-TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040B-TU?
AT49BV040B-TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040B-TU 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 AT49BV040B-TU?
For technical support, including AT49BV040B-TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040B-TU requirements.
6.How does Aetrix verify that AT49BV040B-TU is sourced from the original manufacturer or authorized distributors?
All AT49BV040B-TU 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 AT49BV040B-TU meets industry standards.
7.What is the process for return or replacement of AT49BV040B-TU?
All AT49BV040B-TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040B-TU, 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 AT49BV040B-TU part is unused and in its original packaging.
Return procedure for AT49BV040B-TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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