fast mri protection diode rev. v2 madp - 009989 1 1 macom technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information co ntained 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 1 features ? available in surface mount package & axial lead ? passivated chip ? ultra low magnetic construction ? non cavity design ? thermally matched configuration ? low capacitance @ 0 v bias ? low conductance @ 0 v bias ? compatible with automatic insertion equipment ? rohs* compliant * restrictions on hazardous substances, european union directive 2011/65/eu. 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 on state (high power present) and the off state (receiver power present) so as not to decrease the receivers 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. melf axial ordering information part number package package description madp - 009989 - 14320t 1200 piece reel melf madp - 009989 - 14340t 3500 piece reel axial 1. short term duration test pulse used to minimize self heating effect. parameter test conditions units min. typ. max. forward voltage 1 i f = 10 ma, t j = 25c i f = 100 ma, t j = 25c v 1.0 1.2 reverse breakdown voltage 1 i r = 10 a v 75 reverse current 1 v r = 20 v, t j = 25c v r = 50 v, t j = 25c na 50 500 total capacitance v r = 0 v, 1 mhz pf 1.2 5.0 conductance v r = 0 v, 64 mhz s 40 electrical specifications: t a = +25c
fast mri protection diode rev. v2 madp - 009989 2 2 macom technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information co ntained 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 2 absolute maximum ratings 2,3 parameter absolute maximum junction temperature 175c peak repetitive reverse voltage working peak reverse voltage dc blocking voltage 75 v rms reverse voltage 50 v forward current 150 ma dc non - repetitive peak forward surge current 8.3 ms single half sine wave 2.5 a storage temperature - 65c to +175c operating temperature - 65c to +175c 2. exceeding any one or combination of these limits may cause permanent damage to this device. 3. macom does not recommend sustained operation near these survivability limits. thermal characteristics parameter test conditions units thermal resistance axial leaded r jl @ lead length = 3/8 inches surface mount (us) r jec 150c/w 40c/w
fast mri protection diode rev. v2 madp - 009989 3 3 macom technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information co ntained 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 3 typical performance curves if vs. vf conductance vs. frequency capacitance vs. frequency 1 10 100 10 100 conductance @ 0 v (s) frequency (mhz) 150 0 1 2 3 4 5 0 20 40 60 80 100 120 140 capacitance @ 0 v (pf) frequency (mhz) 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 0 1 2 3 4 5 forward current (a) forward voltage (v f )
fast mri protection diode rev. v2 madp - 009989 4 4 macom technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information co ntained 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 4 outline drawing, hermetically sealed glass axial leaded lead finish: tin lead material: copper polarity: cathode end is banded package weight: 0.150 g symbol dimensions notes inches millimeters min. max. min. max. bd 0.056 0.080 1.420 2.03 2 bl 0.130 0.180 3.300 4.57 ld 0.018 0.022 0.046 0.56 3 ll 1.00 1.500 25.400 38.10 outline drawing, hermetically sealed glass lead finish: tin end cap material (u, us): copper polarity: cathode end is banded package weight: 0.095 g mounting surface selection: the axial coefficient of expansion (coe) of this device is approximately +4ppm/c. the coe of the mounting surface system should be selected to provide a suitable match with this device. symbol dimensions inches millimeters min. max. min. max. d 0.070 0.085 1.78 2.16 b 0.165 0.195 4.19 4.95 ect 0.019 0.028 0.048 0.71 s 0.003 0.08 notes: 1. dimensions are in inches. millimeters are given for general information only. 2. dimension bd shall be measured at the largest diameter. 3. the specified lead diameter applies in the zone between .050 inch (1.27 mm) from the diode body to the end of the lead. outsi de of this zone lead shall not exceed bd. 4. in accordance with asme y14.5m, diameters are equivalent to x symbology.
fast mri protection diode rev. v2 madp - 009989 5 5 macom technology solutions inc. (macom) and its affiliates reserve the right to make changes to the product(s) or information co ntained 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 5 macom technology solutions inc. all rights reserved. information in this document is provided in connection with macom technology solutions inc ("macom") products. these materials are provided by macom as a service to its customers and may be used for informational purposes only. except as provided in macom's terms and conditions of sale for such products or in any separate agreement related to this document, macom assumes no liability whatsoever. macom assumes no responsibility for errors or omissions in these materials. macom may make changes to specifications and product descriptions at any time, without notice. macom makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. no license, express or implied, by estoppels or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" without warranty of any kind, either express or implied, relating to sale and/or use of macom products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. macom further does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. macom shall not be liable for any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of these materials. macom products are not intended for use in medical, lifesaving or life sustaining applications. macom customers using or selling macom products for use in such applications do so at their own risk and agree to fully indemnify macom for any damages resulting from such improper use or sale.
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