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DS87C520-MCL Equivalent & Substitute Parts
Part Overview
The DS87C520-MCL is an 8051-based 8-bit microcontroller manufactured by Analog Devices Inc./Maxim Integrated. This embedded processor features 16KB OTP program memory, 1KB RAM, and operates at 33MHz with a 4.5V to 5.5V supply voltage. The device is packaged in a 40-pin DIP configuration and includes integrated peripherals such as Power-Fail Reset and Watchdog Timer functionality.
The DS87C520-MCL is classified as obsolete. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original components are no longer readily available or where design improvements are required.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | 8051 |
| Core Size | 8-Bit |
| Speed | 33MHz |
| Program Memory Size | 16KB (16K x 8) |
| Program Memory Type | OTP |
| RAM Size | 1K x 8 |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V |
| Number of I/O | 32 |
| Connectivity | EBI/EMI, SIO, UART/USART |
| Peripherals | Power-Fail Reset, WDT |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Through Hole |
| Package / Case | 40-DIP (0.600", 15.24mm) |
Substitute Part Grouping Explanation
Substitution of the DS87C520-MCL is determined by strict equivalence across the following critical parameters:
- Core Architecture: 8051-based processor
- Memory Configuration: 16KB OTP program memory and 1KB RAM
- Operating Frequency: 33MHz
- Supply Voltage Range: 4.5V ~ 5.5V
- I/O Count: 32 pins
- Peripheral Set: Power-Fail Reset and Watchdog Timer
- Package Type: 40-pin DIP through-hole configuration
- Temperature Range: 0°C ~ 70°C
The DS87C520-MCL+ qualifies as a direct substitute because it maintains identical electrical specifications, memory architecture, clock frequency, I/O configuration, and peripheral functionality. The primary distinction is product status and packaging format.
Parameter Comparison
| Parameter | DS87C520-MCL | DS87C520-MCL+ | Match |
|---|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Yes |
| Core Processor | 8051 | 8051 | Yes |
| Core Size | 8-Bit | 8-Bit | Yes |
| Speed | 33MHz | 33MHz | Yes |
| Program Memory Size | 16KB (16K x 8) | 16KB (16K x 8) | Yes |
| Program Memory Type | OTP | OTP | Yes |
| RAM Size | 1K x 8 | 1K x 8 | Yes |
| Voltage Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V | Yes |
| Number of I/O | 32 | 32 | Yes |
| Connectivity | EBI/EMI, SIO, UART/USART | EBI/EMI, SIO, UART/USART | Yes |
| Peripherals | Power-Fail Reset, WDT | Power-Fail Reset, WDT | Yes |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | Yes |
| Mounting Type | Through Hole | Through Hole | Yes |
| Package / Case | 40-DIP (0.600", 15.24mm) | 40-DIP (0.600", 15.24mm) | Yes |
| Product Status | Obsolete | Active | Different |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | Different |
Engineering Selection Recommendations
The DS87C520-MCL+ is a direct electrical and mechanical equivalent of the DS87C520-MCL. Selection between these parts should be based on the following factors:
Product Status: The DS87C520-MCL is classified as obsolete, while the DS87C520-MCL+ maintains active product status. For new designs or system updates, the DS87C520-MCL+ is the appropriate choice due to ongoing manufacturer support and availability.
Regulatory Compliance: The DS87C520-MCL+ is ROHS3 compliant, whereas the DS87C520-MCL is RoHS non-compliant. Applications subject to RoHS regulations or environmental compliance requirements must use the DS87C520-MCL+.
Packaging: The DS87C520-MCL+ is supplied in tube packaging, while the DS87C520-MCL packaging format is not specified. Packaging selection depends on assembly process requirements and inventory management practices.
Functional Equivalence: Both parts share identical electrical specifications, memory architecture, clock frequency, I/O configuration, and peripheral functionality. Pin-for-pin compatibility is maintained.
Frequently Asked Questions (FAQ)
Q: Can the DS87C520-MCL+ be used as a direct replacement for the DS87C520-MCL?
A: Yes. The DS87C520-MCL+ is electrically and mechanically equivalent. All electrical parameters, memory configuration, clock frequency, I/O count, peripheral set, and package dimensions are identical. Pin-for-pin compatibility is maintained.
Q: What is the primary difference between these two parts?
A: The DS87C520-MCL is obsolete, while the DS87C520-MCL+ is active. Additionally, the DS87C520-MCL+ is ROHS3 compliant, whereas the DS87C520-MCL is RoHS non-compliant. Packaging format also differs.
Q: Are there any electrical parameter differences?
A: No. Both parts operate at 33MHz, support 4.5V to 5.5V supply voltage, feature 16KB OTP program memory, 1KB RAM, 32 I/O pins, and include identical peripheral functionality.
Q: What is the operating temperature range for both parts?
A: Both the DS87C520-MCL and DS87C520-MCL+ operate across 0°C to 70°C (TA).
Q: Is the 40-pin DIP package identical for both parts?
A: Yes. Both parts use the same 40-DIP (0.600", 15.24mm) through-hole package configuration.
Q: Which part should be selected for new designs?
A: The DS87C520-MCL+ should be selected for new designs due to active product status and ROHS3 compliance.
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