MA Varistor Series. LEAD-FREE AND RoHS COMPLIANT. Varistor Products

Transcription

1 RoHS Pb The MA Series of transient surge suppressors are axial-lead metal-oxide varistors (MOs) for use in a wide variety of board level industrial and commercial electronic equipment. They are intended to protect components and signal/data lines from low energy transients where the small axial lead package is required. The MA Series is offered with standard (S suffix) or tightened (B suffix) clamping voltage. See MA Series Device Ratings and Specifications table for part number and brand information. Features 3mm Diameter Disc Size Small Package Wide Operating oltage Range M(AC)RMS...9 to 64 M(DC)...3 to 365 Available in Tape and Reel or Bulk Packaging No Derating Up to 85 o C Ambient New black epoxy offers improved performance for high temperature lead-free wave soldering process. LEAD-FREE AND RoHS COMPLIANT 7

2 Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous: MA SERIES Steady State Applied oltage: AC oltage Range ( M(AC)RMS ) to 64 DC oltage Range ( M(DC) ) to 365 Transient: Peak Pulse Current (I TM ) For 8/0µs Current Wave (See Figure ) to Single Pulse Energy Range For /0µs Current Wave (W TM ) to.7 Operating Ambient Temperature Range (T A ) to 85 Storage Temperature Range (T STG ) to 5 Temperature Coefficient (α) of Clamping oltage ( C ) at Specified Test Current <0.0 Hi-Pot Encapsulation (Isolation oltage Capability) (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 0, Method ) Insulation Resistance UNITS A J O C O C %/ O C MΩ CAUTION: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Device Ratings and Specifications IMUM RATINGS (85 o C) SPECIFICATIONS (5 o C) CONTINUOUS RMS DC ENERGY (/0µs) TRANSIENT PEAK (8/0µs) OLTAGE AT ma DC TEST CLAMPING OLTAGE C AT.0A (8/0µs) TYPICAL CAPACI- TANCE PART NUMBER MAA MAB MAS MAA MAB MAS 7MAA 7MAB 7MAS MAA MAB MAS MAA MAB MAS MAA MAB MAS MAA MAB MAS MA3A MA3B MA3S 8MA3A 8MA3B 8MA3S BRAND A B S A B S 7A 7B 7S A B S A B S A B S A B S A B S 8A 8B 8S M(AC) M(DC) W TM I TM MIN N(DC) C f = MHz () () (J) (A) () () () () (pf)

3 Device Ratings and Specifications (Continued) IMUM RATINGS (85 o C) SPECIFICATIONS (5 o C) CONTINUOUS RMS DC ENERGY (/0µs) TRANSIENT PEAK (8/0µs) OLTAGE AT ma DC TEST CLAMPING OLTAGE C AT.0A (8/0µs) TYPICAL CAPACI- TANCE PART NUMBER MA4A MA4B MA4S BRAND M(AC) M(DC) W TM I TM MIN N(DC) C f = MHz () () (J) (A) () () () () (pf) MAA MAB MAS MAA MAB MAA MA3B MAA 0MA4B MAA 70MA4B MAA 3MA5B MA3A 3MA6B MA3A 4MA7B NOTE: Average power dissipation of transients not to exceed mw. Power Dissipation Ratings Should transients occur in rapid succession, the average power dissipation required is simply the energy (watt-seconds) per pulse times the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings and Specifications table for the specific device. Furthermore, the operating values need to be derated at high temperatures as shown in Figure. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. PERCENT OF RATED ALUE AMBIENT TEMPERATURE ( o C) FIGURE., ENERGY AND POWER DERATING CURE 9

4 PERCENT OF PEAK ALUE O = irtual Origin of Wave T = Time From % to % of Peak T = irtual Front time =.5 t T = irtual Time to Half alue (Impulse Duration) Example: For an 8/0µs Current Waveform: 8µs = T = irtual Front Time 0µs = T = irtual Time to Half alue O TT T TIME Transient -I Characteristics Curves FIGURE. PEAK PULSE TEST WAEFORM IMUM PEAK OLTS () CLAMPING OLTAGE TO N(DC) RATING MA4A/S 8MA3A/S MA3A/S MAA/S MAA/S MAA/S MAA/S 7MAA/S MAA/S MAA/S IMUM PEAK OLTS () 4,000,000,0, CLAMPING OLTAGE TO 4 N(DC) RATING 4MA3A 3MA3A 3MAA 70MAA 0MAA MAA MAA MAA/S FIGURE 3. CLAMPING OLTAGE FOR MAA/S - MA4A/S FI GURE 4. CLAMPING OLTAGE FOR MAA/S - 4MA3A IMUM PEAK OLTS () CLAMPING OLTAGE TO N(DC) RATING MA4B 8MA3B MA3B MAB MAB MAB MAB 7MAB MAB MAB FIGURE 5. CLAMPING OLTAGE FOR MAB - MA4B IMUM PEAK OLTS () 4,000 3,000,000, IMUM CLAMPING OLTAGE TO 4 N(DC) RATING 4MA7B 3MA6B 3MA5B 70MA4B 0MA4B MA3B MAB MAB FIGURE 6. CLAMPING OLTAGE FOR MAB - 4MA7B

5 Pulse Rating Curves SURGE (A) INDEFINITE MAA - MA4B ,000,000 IMPULSE DURATION (µs) FIGURE 7. SURGE RATING CURES FOR MA SERIES - MA SERIES SURGE (A) MAA - 4MA7B 0.5 INDEFINITE ,000,000 IMPULSE DURATION (µs) FIGURE 8. SURGE RATING CURES FOR MA SERIES - 4MA SERIES NOTE: If pulse ratings are exceeded, a shift of N(DC) (at specified current) of more than ±% could result. This type of shift, which normally results in a decrease of N(DC), may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection. Mechanical Dimensions Tape and Reel Specification H H = H ± H INCHES MILLIMETERS SYMBOL MIN MIN Øb ØD G H L Typical Weight = 5g ± Ordering Information XXX MA XX ENERGY/CLAMPING OLTAGE ARIANT 0. ± ± Conforms to EIA Standard RS-96E 0. ± 0.0 OLTAGE ( N at ma) SERIES DESIGNATOR Bulk Use MT for Tape and Reel