THIN FILM CHIP RESISTORS 68 Series 0.020"x0.020" Spectrum Microwave 68 Series 0.020" x 0.020" Thin-film Chip Resistors are available in both top-contact and back-contact versions in several resistances and tolerances. Values are available from 1 ohm to 500 Kohms. Both passivated nichrome and tantalum-nitride resistor versions are available. Nichrome provides excellent stability and temperature coefficient in hermetic applications while tantalum-nitride provides superior moisture-resistance for non-hermetic applications. Electrical Specifications Parameter Power Rating Life Noise High Temp Exposure TCR (68AL, 68BCN) TCR (68ALT, 68BCR) Operating voltage Moisture resistance Thermal shock Limit 100 mW 0.2% max -35 dB typ 0.2% max 50 ppm/C -50 to -120 ppm/C 100 VDC max 0.5% max 0.5% max Test conditions (derated at 70 to 0 mW @ 150) 1000 hours @ 125 C MIL-STD-202 method 308 100 hours at 150 C -55 to 125 C -55 to 125 C MIL-STD-202 method 106 MIL-STD-202 method 107 Typical Configurations Values below 20 oh ms Values from 20 to 200 ohms Values above 200 ohms 0.020 On back--Contact versions, pad without bevel is connected to back side. 0.005 Mechanical Specifications Substrate Bond pad metalization Size Thickness Bond pad dimensions Protective overcoat (passivation) Back side Silicon with 1 micron thermal oxide Gold, 100 microinches 0.021 x .021 0.002 (0.53 x 0.53 mm 0.05 mm) 0.013 0.003 (0.33 0.07 mm) 0.004 x .004 minimum (0.1 x 0.1 mm) 0.6 microns SiO2 (68AL & 68BCN versions only) Lapped silicon (68AL, 68ALT), Gold (68BCN, 68BCR) Spectrum Microwave Tel: 508-485-6350 Fax : 508-485-5168 165 Cedar Hill Street, Marlborough, Ma 01752 www.SpectrumMicrowave.com THIN FILM CHIP RESISTORS 68 Series 0.020"x0.020" All parts are 100% electrically tested, sample tested per MIL-STD-38534 section 3.4, and visually inspected to MIL-STD-883 requirements. Chips are supplied in standard 2"x 2" matrix tray packaging. Ordering Information Base Part Code Value (3 digits plus exponent) Tolerance Letter 68xxx- NNNE X 68AL (Nichrome top-contact) (Under 100 ohms, an R indicates the decimal point location) B = 0.1% C = 0.25% D = 0.5% F = 1% G = 2% J = 5% K = 10% M = 20% 68ALT (Tantalum-nitride topcontact) 68BCN (Nichrome back-contact) 68BCR (Tantalum-nitride backcontact) Ordering Examples: 68AL-5002F is a 50 kilohm 1% resistor with nichrome metalization. 68ALT-75R0J is a 75 ohm 5% resistor with tantalum-nitride metalization. 68BCR-5R10K is a 5.1 ohm 10% back contact resistor with tantalum-nitride metalization. Availability and Limitations: 68AL & 68BCN series are available from 2 ohms to 500 kohms. 68ALT & 68BCR series are available from 1 ohm to 250 kohms. B tolerance is available above 250 ohms. C tolerance is available above 100 ohms. D tolerance is available above 50 ohms. F tolerance is available above 25 ohms. G tolerance is available above 12 ohms. J tolerance is available above 5 ohms. (Specifications subject to change without notice.) Spectrum Microwave also manufactures Custom Substrates on a variety of materials, a wide range of Microwave, PIN Diode Drivers, and Custom Hybrid Circuits. Please contact the factory or your local representative for more information.