Alternatives to Microchip Technology AT89C51RD2-RLTUM
Microchip Technology AT89C51RD2-RLTUM and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 AT89C51RD2-RLTUMMicrochip Technology | AT89C51RD2T-RLTUMMicrochip Technology | AT89LP51RD2-20AAUMicrochip Technology | +1more | |
|---|---|---|---|---|
| FFF Compatibility | The part offers an identical 44-LQFP package with a 100% match on all pin assignments including NC pins.Matches the 10x10mm physical body dimensions, 0.8mm pin pitch, and SMD mounting style.Identical 80C51 core executing at up to 60MHz, identical memory size, and 2.7V to 5.5V supply voltage range. | The four 'NIC' (Not Internally Connected) pins (6, 17, 28, 39) on the original AT89C51RD2 are mapped to Port 4 general-purpose I/O lines (P4.1, P4.3, P4.0, P4.2) on this LP version.Identical physical 44-LQFP 10x10mm package dimensions and pin pitch.Offers equal or superior electrical ratings, equivalent 64KB Flash, and an advanced single-cycle 8051 core architecture. | ||
 AI Summary | AT89C51RD2-RLTUM by Microchip Technology: 80C51 89C Microcontroller IC 8-Bit 60MHz 64KB (64K x 8) FLASH 44-VQFP (10x10). | This is the official active direct drop-in replacement recommended by Microchip. It transitions the obsolete silicon to an active, identical-specification revision in the same 44-LQFP footprint, eliminating the need for any hardware or software redesign.
| This is an upgraded, active sibling from Microchip's low-power 89LP single-cycle series. It offers substantially improved execution throughput and modernized peripherals, though care must be taken with the four NC pins which are now active Port 4 I/Os.
| |
| Lifecycle Status | Obsolete | Unknown | Unknown | |
| Market Availability | Discontinued | Unknown | Unknown | |
| REACH | REACH | Unknown | Unknown | |
| RoHS | RoHS | Unknown | Unknown | |
| Description | 80C51 89C Microcontroller IC 8-Bit 60MHz 64KB (64K x 8) FLASH 44-VQFP (10x10) | This is the official active direct drop-in replacement recommended by Microchip. It transitions the obsolete silicon to an active, identical | This is an upgraded, active sibling from Microchip's low-power 89LP single-cycle series. It offers substantially improved execution throughp | |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | |
| Type | Embedded | Component | Component | |
| Datasheet | Open | N/A | N/A | |
| Lead Time | 52 weeks | Unknown | Unknown | |
| Country of Origin | US | - | - | |
| Export Control Class Number | 3A991A2 | EAR99 | EAR99 | |
| HTSUS Code | 8542.31.0015 | - | - | |
| Moisture Sensitivity Level | 3 (168 Hours) | - | - | |
| Speed | 60MHz | - | - | |
| RAM Size | 2K x 8 | - | - | |
| Core Size | 8-Bit | - | - | |
| Peripherals | POR, PWM, WDT | - | - | |
| Connectivity | SPI, UART/USART | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Number of I/O | 34 | - | - | |
| Core Processor | 80C51 | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
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 AT89C51RD2-SLSUMMicrochip Technology | In stock | Active | 5Alternatives availableSee Alternatives |
 AT89C51CC01CA-RLTUMMicrochip Technology | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| AT89S53-24JUMicrochip Technology | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The Microchip Technology AT89C51RD2-RLTUM 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 AT89C51RD2-RLTUM are the AT89C51RD2T-RLTUM (Microchip Technology) and the AT89LP51RD2-20AAU (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 AT89C51RD2-RLTUM 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 AT89C51RD2-RLTUM (Microchip Technology) is a part in the Embedded category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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