AT28BV64B-20TU-T Microchip Integrated Circuit (Small Outline Packages) In Stock
The AT28BV64B-20TU-T is a 64K-bit (8K x 8) byte-wide parallel EEPROM from Microchip Technology in a 28-pin TSOP package. It offers a maximum access time of 200 ns and operates over industrial temperature range with RoHS-compliant green packaging. Ideal for non-volatile parameter storage, firmware retention, and code storage in embedded and industrial control systems.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- AT28BV64B-20TU-T Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 64K-bit (8,192 x 8-bit) byte-wide parallel EEPROM organization
- 200 ns maximum access time for direct CPU bus interface without wait states
- 28-pin TSOP package for space-efficient surface-mount assembly
- Industrial temperature range operation for harsh environment reliability
- RoHS-compliant green packaging meeting modern environmental standards
- Byte and page write modes for flexible in-system programming
Applications
The AT28BV64B-20TU-T is widely used in embedded systems for storing calibration data, configuration parameters, and firmware constants that must survive power cycling without a battery backup. Its parallel 8-bit interface makes it a drop-in replacement for legacy EPROM sockets in industrial controllers, CNC machines, and programmable logic controllers that retain 8K words of non-volatile data. The TSOP-28 package and 200 ns access time allow direct interface to 8-bit and 16-bit CPU data buses operating at up to 5 MHz without additional wait state logic.
Specifications
| Manufacturer Package Code | TSOP-28 |
| YTEOL | 0 |
| Access Time-Max | 200ns |
| JESD-30 Code | R-PDSO-G28 |
| Memory Density | 65536bit |
| Memory IC Type | EEPROM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Words | 8192words |
| Number of Words Code | 8000 |
| Operating Mode | ASYNCHRONOUS |
| Organization | 8KX8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE |
| Parallel/Serial | PARALLEL |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Programming Voltage | 3V |
| Supply Voltage-Max (Vsup) | 3.6V |
| Supply Voltage-Min (Vsup) | 2.7V |
| Supply Voltage-Nom (Vsup) | 3V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.55mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Write Cycle Time-Max (tWC) | 10ms |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How fast can the AT28BV64B-20TU-T be accessed, and does it need wait states with a typical 8-bit microcontroller?
The AT28BV64B-20TU-T has a maximum access time of 200 ns, which means a microcontroller with a bus cycle time longer than 200 ns — for example a 4 MHz 8-bit CPU with a 250 ns cycle — can read directly without inserting wait states, simplifying the memory interface and reducing software overhead.
What is the memory density and organization of the AT28BV64B-20TU-T, and how does it suit parameter storage?
The AT28BV64B-20TU-T stores 65,536 bits organized as 8,192 words of 8 bits each, providing 8 KB of non-volatile byte-addressable storage — sufficient to hold hundreds of calibration coefficients, device configuration records, or a small lookup table that must persist across thousands of power cycles in field-deployed industrial equipment.
Is the AT28BV64B-20TU-T a suitable RoHS-compliant replacement for older UV-erasable EPROMs in legacy designs?
Yes, the AT28BV64B-20TU-T is RoHS-compliant (green) and electrically erases in-system, eliminating the UV exposure step required for ceramic EPROMs. Its 28-pin TSOP footprint and parallel byte-wide interface allow it to replace 27C64-series EPROMs with minor address and write-enable signal adaptations, while the -40°C to 85°C industrial temperature range matches legacy EPROM specifications.
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