Alternatives to Microchip Technology AT89S53-24JU
Microchip Technology AT89S53-24JU and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 AT89S53-24JUMicrochip Technology | AT89S8253-24JUMicrochip Technology | AT89C51ED2-SLSUMMicrochip Technology | +1more | |
|---|---|---|---|---|
| FFF Compatibility | The pinout is identical, matching the standard MCS-51 PLCC-44 layout.Matches the physical dimensions and lead form of the original PLCC-44 package.Executes the same 8051 instruction set at 24MHz with identical 12KB flash memory. | Matches the standard MCS-51 pin layout on the PLCC-44 package.Utilizes the same standard PLCC-44 physical dimensions.Fully backward-compatible instruction set with significantly upgraded memory and speed ceilings. | ||
 AI Summary | AT89S53-24JU by Microchip Technology: 8051 89S Microcontroller IC 8-Bit 24MHz 12KB (12K x 8) FLASH 44-PLCC (16.6x16.6). | This is the official manufacturer-recommended replacement for the obsolete AT89S53-24JU. It is in active production and offers identical memory capacity while adding 2KB of integrated EEPROM, a Power-On Reset circuit, and a wider operating voltage range of 2.7V to 5.5V.
| This is a high-performance, active 8051-based microcontroller that serves as an excellent upgrade alternative. It expands memory capacity to 64KB Flash and 2KB RAM, while increasing the maximum clock speed to 60MHz in the same PLCC-44 package footprint.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | 8051 89S Microcontroller IC 8-Bit 24MHz 12KB (12K x 8) FLASH 44-PLCC (16.6x16.6) | 8051 89S Microcontroller IC 8-Bit 24MHz 12KB (12K x 8) FLASH 44-PLCC (16.6x16.6) | 80C51 89C Microcontroller IC 8-Bit 60MHz 64KB (64K x 8) FLASH 44-PLCC (16.6x16.6) | |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | |
| Type | Embedded | Embedded | Embedded | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 14 weeks | 4 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | 3A991A2 | |
| HTSUS Code | 8542.31.0015 | - | - | |
| Moisture Sensitivity Level | 2 (1 Year) | - | - | |
| Speed | 24MHz | - | - | |
| RAM Size | 256 x 8 | - | - | |
| Core Size | 8-Bit | - | - | |
| Peripherals | WDT | - | - | |
| Connectivity | SPI, UART/USART | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Number of I/O | 32 | - | - | |
| Core Processor | 8051 | - | - |
Unlock all 3 alternatives
- Find & compare verified second sources
- Spot risk early with real-time part monitoring
- Stay compliant and production-ready
Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 AT89C51RD2-RLTUMMicrochip Technology | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
You searched one part. Parter watches your whole BOM.
All your BOM, at once
Parter maps every line to live stock, lead time, lifecycle and compliance data across the entire market — not part by part.
Hear about problems before they hit production
Allocation, EOL and last-time-buy notices surface the moment they appear, not when your buyer's PO bounces.
Qualified replacements in minutes, not days
Every at-risk line gets form-fit-function matches like the ones above — deltas flagged, evidence attached. Review, push to your BOM, and Parter starts watching the new part too.
Frequently asked questions
Yes. The Microchip Technology AT89S53-24JU is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the Microchip Technology AT89S53-24JU are the AT89S8253-24JU (Microchip Technology) and the AT89C51ED2-SLSUM (Microchip Technology), out of 3 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the AT89S53-24JU are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The AT89S53-24JU (Microchip Technology) is a part in the Embedded category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
Schedule a demo
See Parter in action
Discover how Parter can help your hardware team:
- Streamline your hardware operations with AI
- Detect and prevent lifecycle disruptions
- Accelerate product development
- Stay compliant and production-ready