Description:
Lot of 3 **JAN** (Joint Army-Navy) **MIL-spec wet tantalum** capacitors marked **M39006/22-0131**. Hermetically sealed metal-case “wet slug” tantalum capacitors with **axial leads**, built for high-reliability aerospace/defense and rugged industrial electronics. Markings visible include **47UF 50V**, polarity “+”, and manufacturer/lot codes such as **56289** (Vishay Sprague CAGE) and **8815A** (date/lot code—see photos).
Key specs (MIL-PRF-39006/22, Style CLR79):
- Capacitance: **47 µF**
- Voltage rating: **50 VDC**
- Tolerance: **±10%**
- Failure rate (dash 0131): **M level = 1.0% / 1000 hours**
- Operating temperature: **-55°C to +125°C**
- Construction: **Hermetic metal case**, **axial through-hole**, polarized
Modern uses:
- Military/avionics/telecom equipment repair and restoration (M39006-series replacements)
- Professional-grade industrial power supplies and control equipment requiring hermetic wet tantalum parts
- Audio restoration / specialty builds where long-life hi-rel capacitors are desired (with surge protection)
Compatibility note:
Polarized capacitor—install with correct polarity (“+” end). Wet tantalum capacitors are stable long-life parts and don’t “dry out” like aluminum electrolytics, but they **can be sensitive to surge/inrush and voltage spikes**. Use sensible voltage derating and current limiting/soft-start in low-impedance rails. Verify physical fit (axial lead spacing and body size) before installation. NOS/surplus parts sold as shown unless stated tested.