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Microchip Technology AT49BV040A-70TU
- Part No.:
- AT49BV040A-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV040A-70TU.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
AT49BV040A-70TU from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-supply, in-system reprogrammable Flash memory IC operating at 2.7–3.6 V, with 70 ns read access time, 30 µs/byte programming, and sector-erasable architecture including one 16 KB boot block with programmable lockout - used for secure firmware storage in embedded microcontroller systems.
For engineers reviewing the AT49BV040A-70TU datasheet, AT49BV040A-70TU pinout, AT49BV040A-70TU application, or AT49BV040A-70TU equivalent, key selection considerations include its 32-pin TSOP package, 70 ns read timing, boot-block write protection, DATA polling/Toggle Bit erase/program status detection, and compatibility with standard EPROM-like bus interface (CE/OE/WE control).
Technical Context
The AT49BV040A-70TU implements a CMOS-based NOR Flash architecture with internal program control logic and hardware data protection (VCC sense, noise filtering, and input-level inhibit). Its sector organization comprises one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB), all independently erasable via six-cycle command sequences.
It supports standard microprocessor timing for byte programming and sector/chip erase, with automatic internal timing - no external clocks required. End-of-operation detection is provided via DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling), both usable at any point during program/erase cycles without halting system operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), directly replaceable for 512 KB code/data storage in 8-bit microcontroller systems |
| Read Access Time | 70 ns - enables direct execution from flash (XIP) in systems with ≤14 MHz bus timing |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small firmware patches without long delays |
| Sector Erase Time | 7 seconds max - supports selective reprogramming of parameter or application blocks while preserving boot code |
| End-of-Operation Detection | DATA polling (I/O7) and Toggle Bit (I/O6) - eliminates need for fixed delay loops in host firmware |
| Write Endurance | 10,000 program/erase cycles - validated for industrial firmware update cycles over product lifetime |
| Power Supply Range | 2.7–3.6 V - compatible with single Li-ion battery or regulated 3.3 V rails without level shifting |
| Standby Current | 50 µA CMOS - suitable for low-power embedded systems requiring extended sleep modes |
Pinout & Package
AT49BV040A-70TU is packaged in a 32-lead Thin Small Outline Package (TSOP, Type 1, 8 × 20 mm), RoHS-compliant and Pb/halide-free per ordering code suffix 'U'.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11–A18 don't care in command mode |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for Toggle Bit status monitoring |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; controls address latching on falling edge |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high; used with CE to prevent bus contention |
| WE | Write Enable | Active-low write control; latches data on rising edge; initiates command sequences and byte programming |
| VCC | Power Supply | 2.7–3.6 V supply; internal VCC sense disables programming if voltage drops below ~1.8 V |
| GND | Ground | Reference for all I/O and power pins; decoupling capacitor required near VCC/GND pair |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16 KB region (00000H–03FFFH) permanently protected after 6-command sequence - ensures bootloader integrity during field updates |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and input-level inhibit (OE low/CE high/WE high) prevent accidental writes |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE control with no special voltage requirements - integrates into legacy 8-bit bus designs without redesign |
| Software Product Identification | Manufacturer code 1FH / device code 13H readable via software command - enables automated device verification in production test |
| Green Packaging Option | Pb/halide-free TSOP package compliant with RoHS Directive 2011/65/EU - meets environmental compliance for global shipments |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing immutable bootloader and configurable runtime parameters in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing XIP-capable 70 ns read access and sector-erased firmware updates. Use Value: Boot block lockout prevents corruption of critical startup code during parameter rewrites, ensuring deterministic system boot across 10,000+ field updates. | Use Scenario: Securing FDA-cleared boot firmware in portable diagnostic equipment requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Certified-replaceable Flash memory with hardware write protection and 50 µA standby current for battery-backed operation. Use Value: Green (Pb/halide-free) TSOP package and 2.7–3.6 V operation support regulatory compliance and extended battery life in Class II medical devices. |
| Automotive ECU Calibration Storage | Networking Equipment Configuration Memory |
Use Scenario: Holding vehicle-specific calibration tables and fault-code logs in engine control units exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade Flash IC with guaranteed 70 ns read timing and 10,000-cycle endurance under thermal cycling stress. Use Value: Sector architecture enables independent erase of calibration data without disturbing boot firmware, reducing recalibration downtime. | Use Scenario: Storing MAC addresses, VLAN settings, and firmware images in managed Ethernet switches with remote configuration capability. IC Role / Device Role / Timing Role: SPI- or parallel-bus-compatible nonvolatile memory supporting in-system reprogramming via host MCU. Use Value: DATA polling and Toggle Bit allow host processor to initiate concurrent operations during 7-second sector erase, maximizing switch uptime. |
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, 3.0–3.6 V supply; same 32-pin TSOP package; lacks boot block lockout feature | Requires external software management for bootloader protection; no hardware-enforced write lock | Select when boot block security is handled at firmware level and lower cost is prioritized |
| MX29LV400CBTI-70G | 4 Mbit, 70 ns, 3.0–3.6 V; includes CFI-compliant command set and 16 KB boot sector with lockout, but uses different command sequences | CFI interface enables auto-detection in BIOS/bootloader; requires command set adaptation | Select for new designs needing standardized Flash interrogation and broader ecosystem tool support |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CBTI-70G, the AT49BV040A-70TU provides hardware-enforced boot block lockout without CFI overhead, making it optimal for legacy 8-bit systems where deterministic, minimal-footprint protection is required - though it lacks standardized identification protocols used in modern BIOS environments.
Availability
AT49BV040A-70TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive ECU calibration storage requiring stable component supply across extended product lifecycles.
Supply support for AT49BV040A-70TU 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 legacy Flash memory product lines with full documentation and long-term support commitments.
The AT49BV040A-70TU belongs to Atmel's legacy parallel-interface Flash memory family, designed specifically for cost-sensitive, 8-bit microcontroller-based systems requiring in-system reprogrammability and hardware-level boot code protection.
FAQ
What is the operating voltage range for the AT49BV040A-70TU?
The AT49BV040A-70TU operates from 2.7 V to 3.6 V DC. It incorporates VCC sense circuitry that inhibits programming if supply voltage falls below approximately 1.8 V, preventing inadvertent writes during brown-out conditions. This single-supply design eliminates the need for separate 5 V or 12 V programming voltages, simplifying power architecture in battery-powered or 3.3 V systems. The AT49BV040A-70TU maintains full read and write functionality across this entire range.
Does the AT49BV040A-70TU support hardware write protection for the boot sector?
Yes, the AT49BV040A-70TU includes a dedicated 16 KB boot block (addresses 00000H–03FFFH) with hardware-enforced programming lockout. Once enabled via a specific six-command sequence, the boot block becomes permanently read-only - neither erasable nor programmable. This feature is verified by reading I/O0 at address 00002H in software product identification mode. The AT49BV040A-70TU's lockout mechanism ensures bootloader integrity independent of host firmware control.
How is end-of-program or end-of-erase detected on the AT49BV040A-70TU?
The AT49BV040A-70TU provides two hardware methods: DATA polling (monitoring I/O7 for complemented data) and Toggle Bit (observing I/O6 toggling state). Both functions operate asynchronously and can be polled at any time during program or erase cycles. When the operation completes, I/O7 returns true data and I/O6 stops toggling. These features eliminate fixed-timing delays in host firmware, allowing the AT49BV040A-70TU to maximize system throughput during in-system updates.
What package type is used for the AT49BV040A-70TU?
The AT49BV040A-70TU uses a 32-lead Thin Small Outline Package (TSOP, Type 1), measuring 8 mm × 20 mm, with lead pitch of 0.50 mm. This green (Pb/halide-free) package complies with RoHS Directive 2011/65/EU and is optimized for surface-mount assembly in space-constrained industrial and medical PCBs. The AT49BV040A-70TU's TSOP footprint is identical to industry-standard 32-pin Flash devices, enabling drop-in replacement in existing layouts.
Is the AT49BV040A-70TU still recommended for new designs?
No - the AT49BV040A-70TU is marked "Not Recommended for New Design" in its official datasheet (3358C–FLASH–3/05). While fully supported for existing production and legacy repair, Microchip recommends migrating to newer serial NOR Flash (e.g., SST26VF032B) or unified memory solutions for new projects. The AT49BV040A-70TU remains available through Aetrix Electronics with full traceability and lifecycle coordination for ongoing manufacturing needs.
AT49BV040A-70TU 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:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49BV040A-70TU FAQ
1.How can I place an order for AT49BV040A-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-70TU 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 AT49BV040A-70TU reliable?
The price and inventory of AT49BV040A-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-70TU is usually 5 days.
3.What payment methods are accepted for AT49BV040A-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-70TU?
AT49BV040A-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-70TU 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 AT49BV040A-70TU?
For technical support, including AT49BV040A-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-70TU requirements.
6.How does Aetrix verify that AT49BV040A-70TU is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-70TU 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 AT49BV040A-70TU meets industry standards.
7.What is the process for return or replacement of AT49BV040A-70TU?
All AT49BV040A-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-70TU, 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 AT49BV040A-70TU part is unused and in its original packaging.
Return procedure for AT49BV040A-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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