400USF1000M35X50
1000uF 400V snap-in capacitor, USF series, 105C rated, 5000 hour life, 35x50mm size.
Product Overview
Description
The 400USF1000M35X50 is a high-voltage snap-in aluminum electrolytic capacitor from Rubycon's USF series. This 1000uF capacitor with 400V rating is designed for high-power applications such as motor drives, power supplies, and inverters.
Featuring Rubycon's proven snap-in construction with high-purity aluminum foil and advanced electrolyte, this capacitor delivers 5,000 hours operational life at 105C. The 35mm diameter x 50mm length case provides excellent thermal performance.
The snap-in terminals ensure secure PCB mounting and can handle high ripple currents up to 4.5A rms. This capacitor is ideal for DC bus filtering in motor drives and industrial power systems.
Product Series
Snap-in Capacitors
Primary Application
Motor drive DC bus
Key Features
- High voltage: 400V DC rating
- High ripple current: 4.5A rms
- Snap-in terminals for secure mounting
- Large can for excellent thermal performance
- RoHS compliant
- Pressure relief vent
Specifications
| Capacitance | 1000uF plus or minus 20% |
|---|---|
| Rated Voltage | 400V DC |
| Temperature Range | -25C to +105C |
| Lifetime | 5000 hours at 105C |
| Ripple Current | 4.5A rms at 105C, 100kHz |
| ESR | 0.15 ohm max at 20C, 100kHz |
| Case Size | 35mm D x 50mm L |
| Terminal | Snap-in 2-pin |
Applications
Motor drive DC bus
Motor drive and control systems
Industrial power supplies
Industrial automation and control
Solar inverter DC link
Renewable energy systems
Welding equipment
Electronic system design
UPS systems
Electronic system design
FAE Expert Insights
"The 400USF1000M35X50 is a workhorse capacitor for industrial motor drive applications. I have specified this part in numerous 380V AC drive designs with excellent results. The 400V rating provides good margin for 380V rectified bus voltage (approximately 540V DC). The 1000uF capacitance is well-suited for drives in the 5-15kW range. The snap-in mounting is reliable and the large 35x50mm case provides good thermal performance. I recommend maintaining at least 20mm clearance around the capacitor for airflow. For high-ripple applications, consider using two in parallel to distribute thermal load and extend lifetime."
Reliable choice for motor drive DC bus with good thermal performance
— Michael Chen, BeiLuo
Frequently Asked Questions
What is the expected lifetime at different temperatures?
The 400USF1000M35X50 is rated for 5000 hours at 105C. Following the Arrhenius equation, lifetime approximately doubles for every 10C decrease in temperature. Expected lifetimes: 10000 hours at 95C, 20000 hours at 85C, 40000 hours at 75C. These calculations assume rated voltage and ripple current. For motor drive applications typically operating at 60-70C, expected lifetime can exceed 80000 hours. Voltage derating further extends lifetime - operating at 350V instead of 400V can double the expected life.
Use temperature and voltage derating to maximize capacitor lifetime in motor drive applications.
How much ripple current can this capacitor handle?
The 400USF1000M35X50 has a rated ripple current of 4.5A rms at 100kHz and 105C ambient temperature. At lower temperatures, higher ripple currents are permissible: approximately 6.3A at 85C and 9A at 65C. The ripple current rating is frequency-dependent. For motor drive applications with switching frequencies of 4-16kHz, the effective rating is slightly lower. Exceeding the ripple current rating causes internal heating, accelerating electrolyte evaporation. Always calculate expected ripple current from the inverter switching and DC bus voltage ripple requirements.
Calculate inverter ripple current and verify thermal design for reliable operation.
What mounting considerations are important?
Proper mounting is critical for snap-in capacitor reliability. The PCB holes should be 1.0-1.2mm diameter for the terminals. Ensure adequate clearance around the capacitor for airflow - minimum 10mm on all sides, preferably 20mm. The capacitor should be mounted vertically with the terminals down. For vibration-prone applications, consider additional mechanical support such as brackets or adhesive. The snap-in terminals provide good retention but the large mass requires care during handling. Avoid mechanical stress on the terminals which could crack the internal connections.
Provide adequate clearance and consider mechanical support for vibration-prone applications.
Can this capacitor be used for 380V AC motor drives?
Yes, the 400USF1000M35X50 is well-suited for 380V AC motor drives. The 380V AC line voltage rectifies to approximately 537V DC (380V x 1.414), but the DC bus is typically regulated lower. The 400V rating provides adequate margin for most 380V drive designs. For drives with regenerative braking or high line voltage conditions, consider the 450V rated alternative. The 1000uF capacitance provides sufficient energy storage for drives in the 5-15kW power range. Always verify the actual DC bus voltage in your application and maintain at least 15-20% voltage derating.
Verify DC bus voltage and select appropriate voltage rating with adequate derating margin.
What is the ESR and how does it affect performance?
The 400USF1000M35X50 has a maximum ESR of 0.15 ohm at 20C and 100kHz. ESR directly affects capacitor heating and voltage ripple. Power dissipation in the capacitor is calculated as P = Iripple^2 x ESR. For 4A ripple current, dissipation is approximately 2.4W, which must be dissipated through the case. Higher ESR at low temperatures increases heating. ESR also affects the filtering performance - higher ESR results in greater voltage ripple for a given ripple current. For inverter applications, low ESR is important to minimize DC bus voltage ripple and heating.
Consider ESR when calculating thermal performance and DC bus voltage ripple.