MA45471

Overview

The MA45471 is a dual anti-parallel non-magnetic PIN diode designed for MRI applications. It operates as a passive switch using silicon PIN diodes in a surface mount package, encapsulated with non-conductive epoxy resin. Under small signals, the pair forms a high Q R-C network, while acting as an effective passive rectifier or short circuit under high RF signals to tune and de-tune resonant MRI tank circuits. The anti-parallel arrangement enhances RF power handling efficiency. Key electrical parameters include a junction capacitance of 1.25–1.50 pF per diode, total capacitance of 3.0–3.5 pF, forward voltage of 0.5–0.8 V at 20 µA, carrier lifetime of 200 ns, and breakdown voltage of 75 V.

Feature Summary

• Non-magnetic surface mount package construction
• Anti-parallel self-bias arrangement for efficient RF power handling
• SPC process ensures superior parametric repeatability

Applications

• MRI passive switching applications
• Tuning and de-tuning resonant MRI tank circuits
• Passive rectification in high RF signal environments

Procurement Notes

Verify component authenticity through authorized MACOM distributors. Confirm RoHS compliance and 260°C reflow compatibility requirements against specific manufacturing standards. Review application note M538 for correct surface mounting procedures to ensure device integrity and performance consistency during assembly processes.

Selection Notes

Select this component when non-magnetic properties are critical for MRI environments. The dual anti-parallel configuration provides enhanced RF power handling compared to single diodes. Ensure the 75V reverse voltage rating and 2A forward current capacity meet the specific circuit demands of the target MRI system design.

Part Context

The MA45471 belongs to MACOM's portfolio of specialized PIN diodes engineered for medical imaging systems. Its non-magnetic construction distinguishes it from standard semiconductor packages, making it suitable for sensitive magnetic resonance environments where ferromagnetic materials would disrupt field homogeneity.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation.