C8051F533-IT Equivalent & Substitute Parts

Part Overview

The C8051F533-IT is an 8-bit microcontroller from Silicon Labs' C8051F53x series, featuring a 25MHz 8051 core with 4KB FLASH program memory and 256 bytes of RAM. This device integrates essential peripherals including LINbus, SPI, UART/USART connectivity, along with brown-out detection, PWM, temperature sensing, and watchdog timer functionality. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity.

Substiute Parts

C8051F533-IT

Silicon LabsIn Stock: 1059C8051F533-IT Datasheet

Current PartRFQ

C8051F533A-IT

Silicon LabsIn Stock: 1111C8051F533A-IT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The C8051F533A-IT qualifies as a direct substitute for the C8051F533-IT based on the following critical parameters:

Matching Parameters:

• Core processor architecture (8051)
• Core size (8-Bit)
• Operating frequency (25MHz)
• Program memory capacity and type (4KB FLASH)
• RAM configuration (256 x 8)
• I/O count (16 pins)
• Analog-to-digital converter specification (A/D 16x12b)
• Connectivity interfaces (LINbus, SPI, UART/USART)
• Peripheral feature set (Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT)
• Package form factor (20-TSSOP)
• Operating temperature range (-40°C ~ 125°C)

Allowable Variation:

• Supply voltage range: C8051F533-IT operates 2V ~ 5.25V; C8051F533A-IT operates 1.8V ~ 5.25V (extended lower limit is compatible)
• Moisture sensitivity level: C8051F533-IT (MSL 1) vs. C8051F533A-IT (MSL 3) represents different handling requirements but does not affect electrical function

Parameter Comparison

Engineering Selection Recommendations

The C8051F533A-IT is the appropriate substitute for the obsolete C8051F533-IT. The substitute part maintains identical electrical specifications across all critical functional parameters, ensuring direct compatibility in existing designs. The C8051F533A-IT carries active product status with verified programmability, providing long-term availability and supply chain stability compared to the obsolete original part.

The extended supply voltage range of the C8051F533A-IT (1.8V minimum vs. 2V minimum) provides additional design flexibility without compromising compatibility. Both parts share identical package geometry, pinout, and peripheral architecture, enabling straightforward component replacement without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the C8051F533A-IT directly replace the C8051F533-IT in existing designs?

A: Yes. Both parts share identical core processor architecture, memory configuration, I/O count, peripheral feature set, package form factor, and operating temperature range. The C8051F533A-IT is electrically and mechanically compatible with the C8051F533-IT.

Q: What is the difference in supply voltage specifications?

A: The C8051F533-IT operates from 2V to 5.25V, while the C8051F533A-IT operates from 1.8V to 5.25V. The extended lower voltage limit of the substitute part does not affect compatibility; designs operating within the 2V to 5.25V range function identically on both parts.

Q: Are there packaging differences between these parts?

A: Both parts use the 20-TSSOP package with identical physical dimensions (0.173" width, 4.40mm). The C8051F533A-IT is supplied in tube packaging, while the original part's packaging type is not specified. This does not affect electrical performance or board-level integration.

Q: Why is the C8051F533-IT classified as obsolete?

A: The C8051F533-IT has reached end-of-life status. The C8051F533A-IT, as an active product from the same manufacturer and series, provides continued design support and production availability.

Q: Are there any differences in programmability or verification status?

A: The C8051F533A-IT carries verified programmability status, while the original part's programmability verification is not confirmed. This does not affect functional compatibility but indicates the substitute has undergone formal validation testing.