True Hermetically Sealed Proportionally Controlled
Metal Package Heater Hybrids
Reliability
Each hybrid circuit is subjected to the following reliability screening per MIL-PRF-38534:
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Precap internal visual Methods 2017 and 2032
High Temperature stabilization bake, Method 1008, Condition C (performed at Customer’s request only)
Temperature cycling, Method 1010, Condition B
Constant acceleration, Method 2001, Condition B, Y axis only
Optional burn-in per Mii specifications
Fine and Gross lead test, Method 1014, Conditions A
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& C
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Notes:
1. The heater is operational from 24 to 32 VDC; however, for optimum performance 28 VDC is recommended.
2. Maximum temperature variation for current change from 5% over Quiescent to 95% of turn on current.
3. Maximum temperature variation over operating voltage range when ambient temperature is constant and the
supply current is between 5% over Quiescent and 95% of turn on current.
4. Maximum temperature with any value of control resistor, including 0 ohms.
All metal package hermetically sealed heaters are leak tested to meet MIL-PRF-38534, Method 1014, test
-7
conditions A & C, with a maximum leak rate of 1 X 10
atm-cc/sec.
Optimum heat transfer is obtained by using a thermal joint compound such as Dow Corning 340 on the mounting
surface.
Operation is possible above 100°C, but electrical performance is not QA guaranteed. Input current decays to
≤20
mA max at = 120°C without damage to the heater.
All Mii heaters are protected against reverse voltage up to 50 V.
Maximum power rating for control resistor is 1/8 watt. Precise resistor values should be determined by measuring
the surface temperature.
Micropac Industries, Inc. will work with the potential customer for voltage and wattage ratings not currently
available.
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION
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905 E. Walnut St., Garland, TX 75040
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(972) 272-3571
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Fax (972) 494-2281
www.micropac.com
E-MAIL:
hybridsales@micropac.com
12/17/01
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MII [ Micropac Industries ]
