Caddock Resistors

Updated: 2026-08-03

Overview

Caddock resistors are precision components manufactured by Caddock Electronics, Inc., a U.S.-based company specializing in high-performance resistors. These resistors are widely used in industries requiring exact resistance values, such as medical instrumentation, aerospace, and laboratory equipment. The brand is recognized for its rigorous quality control and adherence to military-grade standards (e.g., MIL-PRF-55342). Unlike standard resistors, Caddock resistors employ advanced materials like bulk metal foil or custom wirewound designs to minimize drift and noise. Their applications often involve analog signal processing, voltage division, or feedback loops where stability is critical.

Structure and Working Principle

MP850-150-1% 电子元器件 CADDOCK 封装TO220 批次24+

深圳市新思汇科技有限公司

Caddock resistors utilize proprietary technologies such as Bulk Metal® foil or thin-film deposition to achieve tight tolerances (as low as ±0.01%). The resistive element is typically bonded to a ceramic or aluminum substrate, ensuring efficient heat dissipation. For high-power models, heatsink mounting is integrated into the design. The working principle relies on maintaining a consistent resistance value despite environmental stressors like temperature fluctuations or vibration. This is achieved through material selection (e.g., nickel-chromium alloys) and hermetic sealing in some models to protect against humidity.

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Key Features

Caddock resistors excel in three key areas: stability, precision, and durability. Their Temperature Coefficient of Resistance (TCR) can be as low as ±2 ppm/°C, making them suitable for temperature-sensitive applications. Additionally, they exhibit minimal parasitic inductance/capacitance, which is crucial for high-frequency circuits. Another standout feature is their long-term stability, with resistance drift often below 0.05% over 10,000 hours. Models like the MP910 series offer non-inductive designs, while the TF920 leverages thin-film technology for ultra-precision requirements.

Application Areas

Primary applications include medical imaging systems (MRI, CT scanners), where resistor accuracy directly impacts diagnostic quality. They are also used in aerospace avionics, semiconductor test equipment, and precision voltage references. In industrial settings, Caddock resistors stabilize feedback loops in motor drives or power supplies. Their low-noise characteristics make them ideal for audio amplification and measurement devices, where signal integrity is paramount.

Maintenance and Precautions

MP930-0.050-1% 封装TO-220-2 50mΩ ±1% 30W 插件电阻 Caddock 批次25+

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To maintain performance, avoid mechanical stress or bending of leads, which can alter resistance values. Ensure proper derating—most models should operate below 50–70% of their rated power at elevated temperatures. Storage should be in a dry environment, preferably with anti-static packaging. For soldering, follow manufacturer guidelines to prevent thermal damage; some high-precision models require specialized processes like laser trimming post-assembly.

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B2B Procurement Guide

When sourcing Caddock resistors, specify parameters like tolerance, TCR, power rating, and packaging (e.g., surface-mount or through-hole). Lead times for custom configurations can extend to 12 weeks, so plan accordingly. For bulk purchases, negotiate with authorized distributors like Digi-Key or Mouser. Verify authenticity via Caddock’s traceability documentation, as counterfeit components may lack critical performance guarantees. Samples for qualification testing are recommended for mission-critical applications.