SMR-4.000-B

Overview

The SMR-4.000-B is a surface mount ceramic resonator manufactured by Raltron Electronics, operating at a nominal frequency of 4 MHz. It features a frequency tolerance of ±0.3% and an impedance of 50 Ohms. The component is designed for operation within a temperature range of -20°C to +80°C. Its physical dimensions include a maximum height of 1.20 mm (0.047 inches). This device serves as a timing reference solution for general-purpose microcontroller applications requiring stable clock signals.

Feature Summary

• Surface mount construction for automated assembly
• Integrated ceramic resonator technology
• Standardized 50 Ohm impedance matching
• Industrial temperature range capability

Applications

• Microcontroller clock generation
• General-purpose timing circuits
• Consumer electronics boards
• Industrial control modules

Procurement Notes

Verify the specific package variant and lead times with authorized distributors. Confirm that the 50 Ohm impedance aligns with the target oscillator circuit design requirements. Ensure the -20°C to +80°C operating range meets the environmental specifications of the final application before procurement.

Selection Notes

Select this component when a cost-effective, low-profile timing solution is required for standard microcontroller interfaces. The 50 Ohm impedance simplifies driver circuit design compared to higher impedance crystals. Consider the ±0.3% tolerance sufficient for basic communication protocols where high precision is not critical.

Part Context

This ceramic resonator belongs to Raltron's passive components portfolio, offering an alternative to traditional quartz crystals. It integrates the resonant element and necessary capacitors into a single surface mount package, reducing board space and assembly complexity for mass-produced electronic devices.

Replacement Considerations

Direct substitutes must match the 4 MHz frequency, 50 Ohm impedance, and surface mount form factor. Verify compatibility with existing PCB footprints and oscillator driver configurations before swapping.