1. What is this document?

This is a product data sheet for Caddock Electronics' Type TK Low TC Precision Radial-Lead Film Resistors. It's essentially a technical document describing the resistor's characteristics, performance, and applications.

2. Key Features & Benefits (from the text):

️· Low Temperature Coefficient (TC): This is the primary selling point. The resistor offers exceptionally low temperature coefficient values (5, 10, or 20 ppm/°C) allowing for ratio tracking of less than 10 ppm/°C in matched-pair voltage dividers without resistor pre-selection.
️· Long-Term Stability: It exhibits good long-term absolute stability.
️· Wide Resistance Range: Available in a wide range of resistance values from 1K Ohm to 10 Megaohm.
️· Precision Tolerances: Standard tolerance of ±0.1%, with options for ±1% and ±0.05%.
️· Wide Operating Temperature Range: Can operate from -55°C to +175°C.
️· Small Size & High Density Packaging: Radial-lead mounting and a small rectangular case allows for high packaging densities.
️· Non-Inductive Performance: Provides faster settling times in high-frequency circuits.
️· Tetrinox Resistance System: Caddock's unique technology is claimed to improve resistivity and lower TC.

3. Product Specifications (from the tables and text):

️· Resistance Range: 1K Ohm to 10 Megaohm
️· Temperature Coefficient (TC): 5, 10, or 20 ppm/°C
️· Wattage: 0.2W or 0.3W
️· Maximum Working Voltage: Varies (see tables – values from 200V to 400V are mentioned)
️· Dielectric Strength: 300 V is mentioned.
️· Case Styles: A, B, C, and D are referenced (the data sheet doesn't detail the specific case dimensions, only that they are rectangular).
️· Encapsulation: Transfer Molded
️· Leadwire: Tinned Copper

4. Product Series and Variants (implied from the tables – this gets complex):

The resistors seem to come in a few different "series" or sub-types, likely representing variations in maximum voltage, wattage, or other specifications. Here's a rough interpretation:

️· TK133V, TK133, TK121, TK139: Series with lower wattage (0.2W) options.
️· TK633V, TK621, TK633, TK639: Series with higher wattage (0.3W) options.

5. Applications:

️· Matched-Pair Voltage Dividers: The low TC makes these ideal for this application.
️· High-Frequency Circuits: The non-inductive performance is beneficial.
️· Generally, anywhere precise resistance values with minimal temperature drift are required.

6. Company Information:

️· Caddock Electronics, Inc.
️· Locations: Roseburg, Oregon (Applications Engineering), Riverside, California (Sales and Corporate Office).
️· Contact Information: Phone numbers, email, website, fax numbers are provided.

7. Important Notes & Limitations:

️· Missing Information: The datasheet *does not* include specific dimensional information for the case styles (A, B, C, D).
️· Complex Table Interpretation: The provided tables are difficult to directly read and interpret completely due to their formatting. It's not possible to list every single variant due to that.