What is a cross-reference page for AT28C040-20BC?
This page groups mapped replacement options for AT28C040-20BC so buyers and engineers can compare alternatives before requesting a quote or approving a substitute.
Alternative part analysis
AT28C040-20BC replacements, alternatives, and cross reference
Compare mapped replacement and alternative options for AT28C040-20BC, then verify package, specifications, and application fit before approval.
Compare AT28C040-20BC against mapped replacement options
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This product currently does not show a published cross-reference list. Use RFQ support if your team needs an alternative part review.
Specification view
Parameter Comparison Chart
A side-by-side view of the source part and its mapped alternatives so buyers and engineers can screen package, availability, lifecycle, and key descriptors before RFQ.
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| Parameter Comparison Chart | Current part AT28C040-20BC Microchip Technology |
|---|---|
| Part Number | AT28C040-20BC |
| Manufacturer | Microchip Technology |
| Category | Integrated Circuits (ICs) |
| Subcategory | Memory |
| Package | CDIP |
| Series | - |
| Key Attributes | - |
| Description | IC EEPROM 4M PARALLEL 32CDIP |
| Lifecycle | - |
| Stock | 59,239 |
| Available | 64,999 |
| Min Order | 1 |
| Datasheet | Available |
| Height Seated (Max) | 4.06mm |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Supply Voltage-Max (Vsup) | 5.5V |
| Power Supplies | 5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Voltage - Supply | 4.5V~5.5V |
| Programming Voltage | 5V |
| Memory Size | 4Mb 512K x 8 |
| Access Time | 200ns |
| Supply Current-Max | 0.08mA |
| Mounting Type | Through Hole |
| REACH Status | REACH Unaffected |
| Packaging | Tube |
| Published | 1998 |
| Length | 40.64mm |
| Part Status | Obsolete |
| Categories | Integrated Circuits (ICs) |
| Terminal Position | DUAL |
| Supply Voltage | 5V |
| Technology | CMOS |
| Reach Compliance Code | not_compliant |
| Qualification Status | Not Qualified |
| Manufacturer | Microchip Technology |
| Output Characteristics | 3-STATE |
| Organization | 512Kx8 |
| Number of Functions | 1 |
| Reflow Temperature-Max (s) | 30 |
| Surface Mount | NO |
| Terminal Pitch | 2.54mm |
| Memory Type | Non-Volatile |
| Number of Terminations | 32 |
| Peak Reflow Temperature (Cel) | 240 |
| Width | 15.24mm |
| HTS Code | 8542.32.00.51 |
| Data Polling | YES |
| Memory Interface | Parallel |
| Sub-Categories | Memory |
| Toggle Bit | YES |
| Memory Width | 8 |
| Memory Format | EEPROM |
| Operating Mode | ASYNCHRONOUS |
| Write Cycle Time-Max (tWC) | 10ms |
| Write Cycle Time - Word, Page | 10ms |
| Command User Interface | NO |
| Memory Density | 4194304 bit |
| Additional Feature | AUTOMATIC WRITE |
| Operating Temperature | 0°C~70°C TC |
| ECCN | 3A991B1B1 |
| Standby Current-Max | 0.003A |
| Base Part Number | AT28C040 |
| Package / Case | 32-CDIP (0.600, 15.24mm) |
| Manufacturer's Part No. | AT28C040-20BC |
| Page Size | 256words |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | RoHS non-compliant |
| JESD-609 Code | e0 |
| HTSUS | 8542.32.0051 |
| ECCN Code | 3A991.B.1.B.1 |
| JESD-30 Code | R-CDIP-T32 |
| Actions |
Cross-reference FAQ
Replacement Part Questions
Short answers for teams reviewing AT28C040-20BC replacement and equivalent-part options.
Does a mapped alternative mean a guaranteed drop-in replacement for AT28C040-20BC?
Not automatically. Cross-reference mapping helps shortlist candidates, but package, electrical behavior, qualification scope, and approval rules still need to be checked before release.
Which parameters should teams compare first for AT28C040-20BC alternatives?
Start with package, series, key attributes, lifecycle status, stock position, datasheet access, and the mapped pin-to-pin or cross-reference note. Then confirm application-specific requirements in the datasheet and RFQ stage.
Can I request a quote for an alternative to AT28C040-20BC?
Yes. Use the product links or RFQ actions on this page to request pricing, availability, documentation, and sourcing support for any listed alternative part.
Is AT28C040-20BC obsolete, and what replacement should buyers review first?
Check the lifecycle row on this page first. If buyers need a fast starting point, the strongest mapped replacement currently surfaced here is , followed by the other alternatives shown in the comparison table.
Engineering support
Need help validating the replacement path?
If your team is unsure whether a mapped alternative to AT28C040-20BC from Microchip Technology is really usable, contact us for help on package fit, pin compatibility, key parameter gaps, and qualification-facing review questions.
Contact a hardware engineer
Email our engineering support contact at [email protected], or use the contact page if the question should be routed across sourcing, engineering, and support.
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Package and pin compatibility
Review whether the alternate path looks credible from package, footprint, and pin-level perspectives.
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Parameter and function gaps
Surface the electrical, interface, or application-fit questions that still need confirmation before approval.
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Qualification and approval prep
Organize the documentation, datasheet evidence, and validation checkpoints your internal team may still require.