microsemi microwave products 75 technology drive, lowell, ma. 01851, 978-442-5600, fax: 978-937-3748 page 1 copyright ? 2006 rev: 2009-01-19 umx5101 ultra low magnetic moment pin diode for mri applications www. microsemi .com rohs compliant 0 b description the umx5101 pin diode series was designed to provide ultra low magnetic pin diodes for in bore surface coil applications associated with higher field strength (3t and greater) mr scanners. these pin diodes produ ce the minimum artifacts (magnetic field distortions) available in the industry, today. the diodes have been tested in magnetic fields of 7 tesla . the umx5101 pin diodes have a magn etic moment at 7 t of 2e-8 (j/t) . the diodes are offered in a surface mount packag e. the sm package utili zes a square end cap to mark the cathode. the anode is round. the fully sogo passivated pin diode chip is full face metallurgically bonded to high conductiv e pins for lower thermal and electrical resistances. the pin diodes feature low forward bias resistance and hi gh zero bias impedance. the umx5101 pin diodes are characterized at 64, 128, and 300 mhz. the umx5101 meets rohs requirements per eu directive 2002/95/ec. absolute maximum ratings at 25o c (unless otherwise specified) rating symbol value unit peak repetitive reverse voltage working peak reverse voltage dc blocking voltage v rrm v rwm v r 100 100 100 v rms reverse voltage v r (rms) 75 v storage temperature t stg -65 to +175 oc operating temperature non-repetitive peak t op -65 to +150 oc thermal characteristics at 25o c (unless otherwise specified) thermal resistance UMX5101SM 20 oc/watt important : for the most current data, consult our website: h u www.microsemi.com u key features ? ultra low magnetic construction ? sogo passivated chip ? thermally matched configuration ? rohs compliant 1 ? low capacitance at 0 v bias ? low conductance at 0 v bias ? metallurgical bond ? fused-in-glass construction ? non cavity design ? available in surface mount package. ? compatible with automatic insertion equipment 1- these devices are supplied with silver terminations. other terminal finishes may be av ailable on request. consult factory for details. applications/benefits ? high b field (3t+) in bore applications: ? active or semi-active (not passive) ? mr blocking circuits ? mr detuning circuits ? mr disable circuits ? mr receiver protector circuits u u m m x x 5 5 1 1 0 0 1 1
microsemi microwave products 75 technology drive, lowell, ma. 01851, 978-442-5600, fax: 978-937-3748 page 2 copyright ? 2006 rev: 2009-01-19 umx5101 ultra low magnetic moment pin diode for mri applications www. microsemi .com rohs compliant electrical parameters @ 25 ? c (unless otherwise specified) parameter symbol conditions min typ. max units forward voltage (note 1) v f i f = 100 ma 0.82 1.0 v reverse break down voltage v br i r = 10 ua 100 v reverse current i r v r = 100 v 10 ua inductance ls 800 ph @ 7t 2e-8 magnetic moment m @ 1t 5e-8 j/t @ 7t -2.7e-11 mass susceptibility @ 1t 1.2e-9 m 3 /kg >1t to 7t -2.4e-7 volume susceptibility <1 t 1.0e-5 si v r = 0 v, f = 1 mhz 2.5 3.0 capacitance c t v r = 100 v, f = 1 mhz 1.0 1.2 pf v r = 0 v, f = 64 mhz 10 30 parallel resistance r p v r = 30 v, f = 64 mhz 800 1000 k ? series resistance r s if = 100 ma f = 64 mhz 0.8 1.0 ? lifetime if = 10 ma 2 2.5 us e e l l e e c c t t r r i i c c a a l l s s
microsemi microwave products 75 technology drive, lowell, ma. 01851, 978-442-5600, fax: 978-937-3748 page 3 copyright ? 2006 rev: 2009-01-19 umx5101 ultra low magnetic moment pin diode for mri applications www. microsemi .com rohs compliant magnetic moment vs field c-v curves -10-9-8-7-6-5-4-3-2-1012345678910 field (t) -50 -40 -30 -20 -10 0 10 20 30 40 50 magnetic moment (nj/t) UMX5101SM typical 0 102030405060708090100 vr (v) 0.0 1.0 2.0 3.0 4.0 ct (pf) umx5101 typical 1 mhz 64, 128, & 300 mhz rp ? parallel resistance rs vs if 0 5 10 15 20 25 30 35 40 45 50 vr (v) 3 10 4 10 5 10 6 10 rp (ohms) umx5101 typical 64 mhz 128 mhz 300 mhz -2 10 -1 10 0 10 1 10 2 10 if (ma) -1 10 0 10 1 10 2 10 3 10 rs (ohms) umx5101 typical 64 128 300 mhz g g r r a a p p h h s s g g r r a a p p h h s s
microsemi microwave products 75 technology drive, lowell, ma. 01851, 978-442-5600, fax: 978-937-3748 page 4 copyright ? 2006 rev: 2009-01-19 umx5101 ultra low magnetic moment pin diode for mri applications www. microsemi .com rohs compliant vf vs if sm style solder footprint 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 vf (v) -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 if (a) umx5101 typical notes: 1. these dimensions will ma tch the terminals and provide for additional solder fillets at the outboard ends at least as wide as the termi nals themselves, assuming accuracy of device placement within .005 inches. 2. if the mounting method chosen requires use of an adhesive separate from the solder compound, a round (or square) spot of cement as shown should be centrally located. dimensions shown are in inches ?sm? style package outline dimensions shown are in inches g g r r a a p p h h s s / / m m e e c c h h a a n n i i c c a a l l
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