Radiant Technologies, Inc. 2835D Pan American Freeway NE Albuquerque, NM 877 Tel: 55-842-87 Fax: 55-842-366 e-mail: radiant@ferrodevices.com www.ferrodevices.com Date: April 16, 13 RTAD Dual Ferroelectric Capacitors in TO-18 Package Summary: The RTAD package contains two identical 3% niobium-doped /8 PZT capacitors with platinum electrodes. Each die is packaged in a four-lead TO-18 header. One package lead connects to the case and is labeled GND. The two capacitors share a single COMMON but have separate leads for their other electrodes. The COMMON lead connects to a common bottom electrode. Top view TO-18 Package COMMON CAP A CAP B CASE Cap A Common Cap B Temperature Range: C to 85 C. Do not exceed 85 C. Absolute Maximum Voltage: 5V Structural Specification: AD 14Å thick 3//8 PNbZT with platinum electrodes and glass passivation. Part Number Capacitor Area AD4,µ 2 Total PZT Lead Content per Die: 1.7 grams AD43 4,µ 2 AD3,µ 2 Maximum Voltage for Normal Operation: 4.2V AD42 4,µ 2 AD2 1,µ 2 Fatigue Limit to 5%: 1,, cycles AD41 4µ 2 Imprint Lifetime RT: > years AD1 µ 2 Imprint Lifetime 85 C: TBD Recovery: 5V 1Hz square wave for seconds from room temperature to 85 C. EDU Compatibility: The EDU can test Type AD capacitors of,µm 2 area (AD3) or less. All other Radiant testers can test all Type AD capacitors regardless of area. For an explanation of the specifications, see Explanation of Ferroelectric Capacitor Properties.
u C / c m 2 Data Plots: Polarization H y s te re s is a t R o o m T e m p e ra tu re a n d 8 5 C [ Type A D 3 ] Hyst 4.2V AFTER : Polarization (µc /cm2) Hyst 4.2V AFTER : Polarization (µc /cm2) 4 - - - -4-4 -3-2 -1 1 2 3 4 Voltage The Blue loop in the plot above is the room temperature hysteresis of the Type AD capacitor. The Red loop is the response at 85 C. Radiant Technologies, Inc. 2
P o l a r i z a t i o n ( u C / c m 2 ) S w itc h e d v s U n s w itc h e d H a lf-l o o p s a t R o o m T e m p e rta u re [ R TA D 4 ] 7 Read UP: Polarization (µc /cm2) Read DO WN: Polarization (µc/cm2) 6 5 4..5 1. 1.5 2. 2.5 3. 3.5 4. 4.5 5. 5.5 Volts To determine the charge generated by a capacitor of specific area, multiply the polarization value from the chart above by the area of the capacitor. Always use the bottom, upward-going half of each trace. Example: What is the charge generated at 4. volts non-switching for a, m 2 capacitor? Polarization x Area = Charge 13 C/cm 2 x [, m 2 x ( -8 cm 2 / m 2 ) ] = 1.3nC 13 C/cm 2 x -4 cm 2 = 1.3nC Note that capacitor areas are denoted in units of square microns while polarization is given in units of square centimeters. There are 1x 8 square microns in a square centimeter. The Type AD capacitors are.14 thick and may be operated up to 5V. The capacitor will withstand 4.2 volts or less under long term DC bias at room temperature. The Type AD is intended for operation from room temperature to 85 C and will begin to leak slightly during hysteresis loops slower than 2 seconds at 85 C. Radiant Technologies, Inc. 3
u C / c m 2 u C / c m 2 Switching Speed The Type AD capacitors will switch faster than one microsecond. Below are the Remanent Polarization vs Pulse Width measurements for room temperature and 85 C. The capacitor under test has an area of, 2. P U N D v s P u l se W i d t h 4.2 V R T [ T ype A D 3 ] PUND 4.2V : P * (µc/cm2) PUND 4.2V : P^ (µc/cm2) 7 PUND 4.2V : dp 6 5 4 Switching Remanent Non-switching -6-5 -4-3 -2-1 1 2 3 Log (ms) P U N D v s P u l se W i d t h 4.2 V 8 5 C [ T ype A D 3 ] PUND 4.2V : P * (µc/cm2) PUND 4.2V : P^ (µc/cm2) PUND 4.2V : dp 6 5 Switching 4 Remanent Non-switching -6-5 -4-3 -2-1 1 2 3 Log (ms) Radiant Technologies, Inc. 4
dp Fatigue The Type AD capacitor has a fatigue lifetime of 1,, cycles to 5% over the temperature range of room temperature to 85 C. Neither temperature nor fatigue frequency has a significant impact on fatigue lifetime. AD3: RT vs 85 C Fatigue 45 4 35 RT dp 1kHz 85C dp 1kHz RT dp Hz 25 15 5 1, 1,,,, Log (cycles) AD3: Alternating 4.2V s pulses with one pair executed at the frequency denoted. Radiant Technologies, Inc. 5
Area Designations Area (cm 2 ) 1x -2 1x -3 4x -4 1x -4 4x -5 1x -5 4x -6 1x -6 Alphanumeric RTAD5 RTAD4 RTAD43 RTAD3 RTAD42 RTAD2 RTAD41 RTAD1 NOTE: The RT will not be included on package labels. Package: Header: HDR1833 Lid: CAN187 Specification: Commercial C to 85 C Atmosphere: Air Bonds: Gold wire between gold bond pads and gold coated posts Radiant Technologies, Inc. 6