Overview
The Sprague 39D 500µF 50VDC capacitor is a high-performance aluminum electrolytic capacitor from Sprague’s Atom series. This axial-lead unit delivers stable capacitance and low leakage current for applications requiring reliable energy storage, filtering, and signal coupling in industrial, audio, and electronic equipment. Welded terminals at anode and cathode points eliminate connection failures typical of riveted designs, ensuring long-term reliability even in demanding microvolt or millivolt signal applications.
Key Features
- 500µF capacitance at 50V DC rating
- Axial lead configuration for easy PCB or through-hole mounting
- Welded terminal construction — eliminates open circuits from pressure connections
- Low leakage current and extended shelf life
- Improved molded phenolic case with pressure-sensitive safety vent
- Rated for 10+ years service life in normal circuit applications
Technical Specifications
- Capacitance: 500µF
- Voltage Rating: 50V DC
- Tolerance: ±10% to +75%
- Operating Temperature: –10°C to +85°C
- Case Size: 19.3 × 54.4 mm (axial)
- Termination Style: Axial lead
- Leakage Current: <50µA at rated voltage
- Safety Feature: Pressure-sensitive vent
- Manufacturer: Sprague (Vishay subsidiary)
Typical Applications
- Audio amplifier coupling and power supply smoothing
- Industrial control circuits and signal filtering
- Television and radio receiver circuits
- Legacy equipment repair and restoration
- DC power supply filtering in low-voltage applications
Compatibility & Replacements
Compatible With
- Through-hole PCB designs with 0.1″ pitch or breadboard layouts
- Vintage and modern analog audio circuits
- Industrial control and instrumentation systems rated up to 50V DC
- Power supply modules and filtering applications
Replaces / Drop-In Replacement For
- Sprague 39D507G050GL6 (variant designation)
- Sprague TVA1315 (equivalent Atom series ratings)
- Other 500µF 50V axial electrolytic capacitors with compatible lead spacing
Works With
- Analog circuit design and prototyping platforms
- Vintage audio tube amp restoration projects
- Legacy industrial equipment refurbishment
- Educational electronics and engineering labs
