MADP-009989 Datasheet, PDF(1/5 Page) M/A-COM Technology Solutions, Inc.

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MADP-009989 Datasheet, PDF (1/5 Pages) M/A-COM Technology Solutions, Inc. – Fast MRI Protection Diode

MADP-009989

Fast MRI Protection Diode

Rev. V2

Features

ï· Available in Surface Mount Package & Axial Lead

ï· Passivated Chip

ï· Ultra Low Magnetic Construction

ï· Non Cavity Design

ï· Thermally Matched Configuration

ï· Low Capacitance @ 0 V bias

ï· Low Conductance @ 0 V bias

ï· Compatible with Automatic Insertion Equipment

ï· RoHS* Compliant

MELF

Axial

Description

The MADP-009989 diode was designed to protect MRI receivers from high RF energy fields including long RF

pulses and RF spike pulses present in most MRI machines. This diode acts as a passive protector (limiter) for the

MRI receiver. No forward bias voltage is required to turn on the diode. It is self-biased by the RF transmitter pulse

power. A switch driver is not needed for this receiver protection application.

Receiver protector diodes appear directly across the input port of the receiver. They are connected in anti-parallel

pairs to limit the RF carrier excursion in both polarities. They must, therefore, exhibit extremely low insertion loss,

both in the âonâ state (high power present) and the âoffâ state (receiver power present) so as not to decrease the

receiverâs sensitivity. This diode is available in two package configurations for flexibility in design.

The MADP-009989 is ideally suited for MRI Receiver Protection and Body Coil Isolation.

Electrical Specifications: TA = +25Â°C

Parameter

Test Conditions

Forward Voltage1

Reverse Breakdown Voltage1

IF = 10 mA, TJ = 25Â°C

IF = 100 mA, TJ = 25Â°C

IR = 10 ÂµA

Reverse Current1

VR = 20 V, TJ = 25Â°C

VR = 50 V, TJ = 25Â°C

Total Capacitance

VR = 0 V, 1 MHz

Conductance

VR = 0 V, 64 MHz

1. Short term duration test pulse used to minimize self heating effect.

Units

Âµs

Min.

Typ.

1.2

Max.

1.0

1.2

500

5.0

Ordering Information

Part Number

Package

Description

Package

MADP-009989-14320T

MADP-009989-14340T

Melf

Axial

1200 piece reel

3500 piece reel

* Restrictions on Hazardous Substances,

European Union Directive 2011/65/EU.

MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.

Visit www.macom.com for additional data sheets and product information.

For further information and support please visit:

https://www.macom.com/support

DC-0012239

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