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The R1421-S series of microwave thin film resistors is designed to be used in microwave hybrid circuits for biasing of active components. These devices can be used over the full military temperature range -55°C to +125°C. Quality and workmanship is per MIL-S-883. Level B. Devices are 100% tested, visual inspected and packaged in waffle packs. US Microwaves employs proprietary thin film technologies for deposition of a wide range of sheet resistance films from 1W/sq to 10.000W /sq. Resistors from 0.1W to x MW range are available.

R(W) USM Part # R(W) USM Part # R(W) USM Part # R(W) USM Part #
1.0 R1421-S-1P0 10 R1421-S-10P0 100 R1421-S-100P0 1000 R1421-S-1000
1.2 R1421-S-1P2 12 R1421-S-12P0 120 R1421-S-120P0 1200 R1421-S-1200
1.5 R1421-S-1P5 15 R1421-S-15P0 150 R1421-S-150P0 1500 R1421-S-1500
1.8 R1421-S-1P8 18 R1421-S-18P0 180 R1421-S-180P0 1800 R1421-S-1800
2.2 R1421-S-2P2 22 R1421-S-22P0 220 R1421-S-220P0 2200 R1421-S-2200
2.7 R1421-S-2P7 27 R1421-S-27P0 270 R1421-S-270P0 2700 R1421-S-2700
3.3 R1421-S-3P3 33 R1421-S-33P0 330 R1421-S-330P0 3300 R1421-S-3300
3.9 R1421-S-3P9 39 R1421-S-39P0 390 R1421-S-390P0 3900 R1421-S-3900
4.7 R1421-S-4P7 47 R1421-S-47P0 470 R1421-S-470P0 4700 R1421-S-4700
5.0 R1421-S-5P0 50 R1421-S-50P0 500 R1421-S-500P0 5000 R1421-S-5000
5.6 R1421-S-5P6 56 R1421-S-56P0 560 R1421-S-560P0 5600 R1421-S-5600
6.8 R1421-S-6P8 68 R1421-S-68P0 680 R1421-S-680P0 6800 R1421-S-6800
7.5 R1421-S-7P5 75 R1421-S-75P0 750 R1421-S-750P0 7500 R1421-S-7500
8.2 R1421-S-8P2 82 R1421-S-82P0 820 R1421-S-820P0 8200 R1421-S-8200

Material Thickness (mils) Die size (mils) Power rating Tolerances q% Capacitance
SiO2/Silicon 10 ±1 (14±2)x(21±2) 75mW@70°C 1, 5, 10 0.7pF

Resistor Conductor Backside metallization
The resistive material is high stability Tantalum Nitride with low temperature coefficient of resistance, <75ppm/°C typical. For Rsq<10W/sq and Rsq>500W/sq, the resistive material is proprietary. The bonding pads of the resistors are 3m thick, 99.99% electroplated gold with a TiW barrier that withstands 30 min at 400°C in air without loss of adhesion. The backside of the die is metallized with TiW/Au which is compatible with most die attaching methods. Other metallizations are available upon special request.


TOLERANCE q MINIMUM ORDER U/P($) /1K U/P($) /5K U/P($) /10K U/P($) /50K U/P($) /100K DELIVERY ORDER
10% 2 weeks ARO for 5% and 10% tolerance and 3-4 weeks ARO for 1%. Certain items are available from Stock

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