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Equivalent & Substitute Parts Reference for AT89C55-24JC
Part Overview
The AT89C55-24JC is an 8-bit 8051 family microcontroller from Microchip Technology, featuring 20KB FLASH program memory, a 44-PLCC surface-mount package, and a maximum operating frequency of 24MHz. It provides 32 I/O pins, operates with supply voltages from 4V to 6V, and is now listed as obsolete. For ongoing designs and active production requirements, selection of alternative models with comparable or validated parameters is necessary.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | 8051 |
| Core Size | 8-Bit |
| Speed | 24MHz |
| Number of I/O | 32 |
| Program Memory Size | 20KB (20K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 256 x 8 |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 6V |
| Oscillator Type | Internal |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Supplier Device Package | 44-PLCC (16.6x16.6) |
| Package / Case | 44-LCC (J-Lead) |
Substitute Part Grouping Explanation
Substitution is determined strictly by matching the following key parameters: core processor (8051), core size (8-bit), speed, number of I/Os, program memory type and size, RAM size, supply voltage range, mounting type, and package form factor. Only parts meeting these criteria within specified tolerances are referenced for direct replacement.
Parameter Comparison
| Parameter | AT89C55-24JC | DS89C430-QNL+ | DS89C450-QNG+ |
|---|---|---|---|
| Core Processor | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit |
| Speed | 24MHz | 33MHz | 25MHz |
| Number of I/O | 32 | 32 | 32 |
| Program Memory Size | 20KB (20K x 8) | 16KB (16K x 8) | 64KB (64K x 8) |
| Program Memory Type | FLASH | FLASH | FLASH |
| RAM Size | 256 x 8 | 1K x 8 | 1K x 8 |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 6V | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Oscillator Type | Internal | External | External |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Supplier Device Package | 44-PLCC (16.6x16.6) | 44-PLCC (16.59x16.59) | 44-PLCC (16.59x16.59) |
| Package / Case | 44-LCC (J-Lead) | 44-LCC (J-Lead) | 44-LCC (J-Lead) |
Engineering Selection Recommendations
The AT89C55-24JC is classified as obsolete and is not RoHS compliant. DS89C430-QNL+ and DS89C450-QNG+ are active models with ROHS3 compliance and REACH unaffected status. Both alternatives are available in the required 44-PLCC surface-mount form, meeting modern compliance requirements. Component selection should be based on product status and environmental compliance certifications as indicated.
Frequently Asked Questions (FAQ)
Q1: What are the primary electrical substitution criteria for AT89C55-24JC?
A1: Key criteria include identical or compatible core processor (8051), core size (8-bit), I/O count, FLASH program memory, and surface-mount 44-PLCC packaging.
Q2: Are the substitute parts compatible with the 44-PLCC footprint used by AT89C55-24JC?
A2: DS89C430-QNL+ and DS89C450-QNG+ both use the 44-PLCC (J-Lead) package, which matches the physical and mounting requirements.
Q3: Do substitute parts offer different program memory sizes?
A3: DS89C430-QNL+ provides 16KB, and DS89C450-QNG+ provides 64KB, compared to 20KB in AT89C55-24JC. Selection is based on specific application memory requirements.
Q4: Are there differences in supply voltage ranges between AT89C55-24JC and its substitutes?
A4: AT89C55-24JC operates from 4V to 6V, while both substitutes operate from 4.5V to 5.5V.
Q5: Do the substitute parts comply with RoHS and REACH standards?
A5: DS89C430-QNL+ and DS89C450-QNG+ are ROHS3 compliant and REACH unaffected; AT89C55-24JC is RoHS non-compliant.
Q6: Is component programmability status verified for substitute parts?
A6: DiGi-Electronics Programmable status is verified for both DS89C430-QNL+ and DS89C450-QNG+, whereas it is not verified for AT89C55-24JC.
Q7: What are the operating temperature ranges for substitute parts compared to the original?
A7: Substitutes support -40°C to 85°C; AT89C55-24JC supports 0°C to 70°C.
Q8: Do substitute parts have different oscillator requirements?
A8: AT89C55-24JC has an internal oscillator; DS89C430-QNL+ and DS89C450-QNG+ use external oscillators.
Q9: Can RAM size affect substitution decisions?
A9: Substitute parts offer 1K x 8 RAM, while AT89C55-24JC offers 256 x 8 RAM. Review if increased RAM meets or exceeds application needs.
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