MML4401-GM2

MML4401-GM2	Product Status Sampling

Overview

There are two principle applications for which the MML4400 series are intended:

1) MRI receiver protection from high RF energy fields, including long RF pulses and RF spike pulses present in most MRI machines. The MML4400 series acts as a passive protector (limiter) for the MRI receiver’s LNA. The diode assembly exhibits extremely low insertion loss, both in the “on” state (high power present) and the “off” state (receiver power present) so the Receiver’s Noise Figure is not increased by the protector circuit.

2) Passive switching of surface coil detuning and blocking circuits. In this case, the flow of loop current during transmitter pulse turns on the diodes, without a switch driver.

The MML4400 series can be combined with a PIN diode (UM7201SM) and the combination can be used to implement a semi-active detune or block circuit design. The MML4400’s turn on the PIN diode (used for higher power switching) during the sinc(x) sidelobes, before the main pulse of the transmitter waveform, sinc(x) = [sin (x)]/x, occurs.

This surface mount limiter meets RoHS requirements per EU Directive 2011/65/EC and 2002/95 EC.

ROHS

Package Carrier:

Tape & Reel

Applications

Featured Applications for MML4401-GM2

Medical

Medical Imaging

Resources

	Datasheets
	MML4400 Series Datasheet

	App Notes
	Analysis of NMR/MRI Coils using PIN Diode Switches
	MicroNote 005: Care, Handling & Solder Profile for Diodes
	MicroNote 010: How to Quickly Obtain Spice Data
	MicroNote 020: Plating and Solder Dipping
	Micronote 1829: Power Diode Datasheet Notation
	MicroNote 30: Metallurgical Bond Evaluation Methods for Diodes
	Micronote 701 - PIN Diode Fundamentals
	Micronote 702 - IFF Systems use PIN Diodes
	Micronote 703 - PINs & GaAs MESFET Switches-Effects on Linearity
	The Potential use of RF PIN Diodes in Hand Held Transceivers

	Drawings
	MML4400 Series Evaluation Board Assembly
	MML4400 Series Package Outlines
	MML4400 Series Tape and Reel Format

	Quality Certificates
	ISO 9001:2008 Certificate - Lowell, MA, USA

Ordering

Distributor	SKU	Stock	MOQ	Pkg
Microchip Technology Inc.	..	..	..	..	Buy Now
Digi-Key	150-MML4401-GM2DKR-ND		..	Custom Reel	No Stock
Digi-Key	150-MML4401-GM2TR-ND		1	Tape & Reel	No Stock
Digi-Key	150-MML4401-GM2CT-ND		..	Cut Tape	No Stock
Mouser	494-MML4401-GM2	3,000	1	Tape & Reel	Buy Now
Richardson RFPD	MML4401-GM2		200	..	No Stock

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This part can be found in the following product categories:

RF/Microwave Silicon and GaAs Diodes Silicon & GaAs PIN Diodes PIN Diodes for MRI Applications MRI Receiver Protection PIN Diodes

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RF, Microwave & Millimeter Wave

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MML4401-GM2

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