Product Overview
Unbranded Box Film Capacitor for Signal Coupling & Timing
Product Condition
Unused, New Old Stock. Unbranded yellow rectangular film capacitor marked “3A3J100.” Body measures approximately 6mm wide × 2mm thick × 6mm tall. No manufacturer identification or datasheet available.
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Product Overview
Radial leaded film capacitor in a compact yellow box-style package. Marked “3A3J100,” with “J” commonly used in capacitor coding to indicate ±5% tolerance, and “100” often associated with a 100V working voltage in many film capacitor formats. The exact capacitance value cannot be confirmed from this marking alone without manufacturer documentation or measurement.
Film capacitors of this construction are non-polarized and suitable for low-voltage signal coupling, timing networks, and filtering in general electronics. With no brand or series data available, this part should be treated as a generic film capacitor for non-critical applications.
Key Features
- Marking: “3A3J100”
- Yellow box-style film construction
- Radial lead configuration
- Non-polarized design
- Approximate body size: 6mm × 2mm × 6mm
- Compact footprint for through-hole PCBs
- Suitable for general-purpose signal applications
Applications
- Low-voltage signal coupling in analog circuits
- RC timing networks
- Audio path filtering and shaping
- General electronics repair
- Prototype and hobby electronics builds
- Educational lab projects
- Replacement in non-critical consumer electronics
Frequently Asked Questions
What is the capacitance value?
The printed code “3A3J100” does not follow a standard universal 3-digit value format. Without a manufacturer reference or measurement, the exact capacitance cannot be confirmed.
Does “J” mean ±5% tolerance?
In many capacitor marking systems, “J” indicates ±5% tolerance. However, without a brand-specific code reference, this cannot be guaranteed.
Is this a 100V capacitor?
The “100” marking commonly corresponds to 100V in many film capacitor formats, but no voltage rating is explicitly printed with a “V.” It should be treated as a low-voltage film capacitor unless independently verified.
Is it polarized?
No. Film capacitors of this type are non-polarized and can be installed in either orientation.
Can it be used on mains voltage?
No safety or agency markings are present. It should not be used in mains-connected or safety-critical applications.
Box film caps like this are workbench staples—simple, stable, and ready for whatever low-voltage circuit needs a steady hand.
