Product Overview
The Caddock Electronics Type USF Ultra-Stable Low TC Film Resistors, available in 200 and 300 Series, are precision-engineered to meet the demanding requirements of high-performance analog electronics. Utilizing Caddock's proprietary resistance film systems, these resistors offer exceptionally low Temperature Coefficients (TC) with a wide resistance range and high voltage ratings. The ceramic package design ensures cool operation and minimizes power coefficient drift, making them ideal for precise amplifier gain setting, resistor bridge circuits, transducer sense circuits, and high-voltage dividers up to 2500 Volts. The 200 Series, constructed with two selected USF 300 Series resistors bonded back-to-back and connected in parallel, achieves an outstanding maximum absolute TC of 2 ppm/C.
Product Attributes
- Brand: Caddock Electronics, Inc.
- Product Line: Type USF Ultra-Stable Low TC Film Resistors
- Series: 200 Series, 300 Series
- Construction: Ceramic package, proprietary resistance film systems
- Lead Finish: Matte Tin (Sn)
Technical Specifications
| Feature/Model | USF 200 Series | USF 300 Series |
|---|---|---|
| Nominal TC | Zero Nominal TC | Zero Nominal TC |
| Maximum Absolute TC (-40C to +85C, ref. to +25C) | 2 ppm/C | 5 ppm/C or 10 ppm/C |
| Absolute Tolerance | 0.01% or 0.1% | 0.01% or 0.1% |
| Resistance Range | 50 Ohm to 25 Megohm | 50 Ohm to 25 Megohm |
| Voltage Ratings | Up to 2500 Volts | Up to 2500 Volts |
| Power Coefficient | Very Low | Low |
| Load Life Stability (2000 hrs @ +85C) | R (+0.015 0.015)% max. | R (+0.015 0.015)% max. |
| Load Life Stability (10000 hrs @ +85C) | R (+0.030 0.030)% max. | R (+0.030 0.030)% max. |
| Thermal Shock (Mil-Std-202 Method 107, -40C min.) | R 0.01% maximum | R 0.01% maximum |
| Voltage Coefficient (specific resistances) | 0.02 ppm/volt maximum | 0.02 ppm/volt maximum |
| Shelf Life Stability (Typical after 1 year) | +(20 ppm 20 ppm)/yr. | +(20 ppm 20 ppm)/yr. |
| Shelf Life Stability (Maximum, 10 years) | 10 ppm/year maximum | 10 ppm/year maximum |
| Operating Temperature | -40C to +85C | -40C to +85C |
| USF240 Wattage @ +85C | 0.33 W | - |
| USF270 Wattage @ +85C | 0.75 W | - |
| USF271 Wattage @ +85C | 0.75 W | - |
| USF340 Wattage @ +85C | - | 0.33 W |
| USF370 Wattage @ +85C | - | 0.75 W |
| USF371 Wattage @ +85C | - | 0.75 W |
| USF240 Max. Continuous Oper. Voltage | 1,400 V | - |
| USF270 Max. Continuous Oper. Voltage | 1,400 V | - |
| USF271 Max. Continuous Oper. Voltage | 2,500 V | - |
| USF340 Max. Continuous Oper. Voltage | - | 1,400 V |
| USF370 Max. Continuous Oper. Voltage | - | 2,500 V |
| USF371 Max. Continuous Oper. Voltage | - | 2,500 V |
| Dimensions (Fig. 1 & 2) | See diagram | See diagram |
| USF200 Series Circuit Board Connection | Two bonded resistors connected in parallel | - |
Custom Options Available: For high quantity applications, custom performance is available including Absolute TC to 1 ppm/C (200 Series), Matched Ratio TC to 0.5 ppm/C for equal resistances, and Matched Ratio TC in 200 Series style bonded resistor pairs.
Other Caddock Low TC Resistor Products: Type TF, Type TK, Type TG, Type USG, T912/T914, Type USVD, Type THV.
2411220157_Caddock-USF340-500K-0-01--5PPM_C7407300.pdf
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