HJC-HC-100F-2.7V
HJC HC Series 100F 2.7V supercapacitor, high capacitance for extended backup power and energy storage applications.
Product Overview
Description
The HJC-HC-100F-2.7V provides high capacitance (100 Farads) for applications requiring extended backup time or significant energy storage.
This supercapacitor is ideal for SSD backup, industrial controller backup, energy harvesting systems, and small UPS applications.
The low ESR and high cycle life make it superior to batteries for high-cycling applications.
Product Series
HJC
Primary Application
SSD backup power
Key Features
- 100 Farads high capacitance
- Very low ESR (≤30mΩ)
- High power density
- 500,000+ cycle life
- Wide temperature range
- Maintenance-free operation
Specifications
| Capacitance | 100F |
|---|---|
| Voltage Rating | 2.7V DC |
| Tolerance | -10% to +30% |
| ESR | ≤0.03Ω @ 1kHz |
| Leakage Current | ≤0.2mA @ 2.7V, 72hrs |
| Temperature Range | -40°C to +65°C |
| Cycle Life | 500,000 cycles |
| Dimensions | 22mm diameter × 45mm height |
| Termination | Radial leads |
Applications
SSD backup power
Electronic system design
Industrial controller backup
Industrial automation and control
Energy harvesting storage
Renewable energy systems
Small UPS systems
Electronic system design
Pulse power systems
Electronic system design
Regenerative braking
Electronic system design
FAE Expert Insights
"The HJC-HC-100F-2.7V is an excellent choice for applications requiring significant energy storage with high power capability. I've used this part extensively for SSD backup applications where it provides 10-30 seconds of backup time - enough to flush cache and shut down safely. The 30mΩ ESR is impressively low for this capacitance, allowing peak currents of 50A+ for short durations. For industrial applications, I often use two in series for 5.4V systems, providing 50F effective capacitance. The cycle life is the real advantage - we've tested these to 500,000+ cycles with minimal degradation. For a recent energy harvesting project, we used four of these to store energy from intermittent solar charging, providing reliable power through nights and cloudy days. HJC's quality control is excellent - ESR and capacitance are very consistent."
High-capacitance supercapacitor for industrial backup and energy storage
— Kevin Zhao, BeiLuo
Frequently Asked Questions
How much energy can this supercapacitor store?
The HJC-HC-100F-2.7V stores significant energy: Total Energy = 0.5 × C × V² = 0.5 × 100F × (2.7V)² = 364.5 Joules (0.1 Wh). However, usable energy depends on minimum operating voltage: 1) Usable to 1.35V (50% voltage): E = 0.5 × 100 × (2.7² - 1.35²) = 273 J (75% of total), 2) Usable to 1.0V: E = 0.5 × 100 × (2.7² - 1.0²) = 314 J (86% of total), 3) Usable to 0.5V: E = 0.5 × 100 × (2.7² - 0.5²) = 352 J (97% of total). For comparison: 1) AA alkaline battery: ~10,000 J (much higher energy), 2) But supercapacitor can deliver 100x higher power. Applications: Power a 10W load for 27-35 seconds (depending on min voltage), or provide 100A peak current for short pulses.
Total energy is 364J; usable energy depends on minimum voltage of your application circuit.
How long can this supercapacitor backup my system?
The HJC-HC-100F-2.7V backup time depends on system power consumption: Backup time = 0.5 × C × (Vmax² - Vmin²) / P. Example calculations: 1) 10W system (3.3V to 2.0V): t = 0.5 × 100 × (2.7² - 2.0²) / 10 = 16.5 seconds, 2) 1W system: t = 165 seconds (2.75 minutes), 3) 100mW system: t = 27.5 minutes, 4) 10mW RTC: t = 4.6 hours. For longer backup: 1) Use multiple capacitors in parallel (2× = 2× time), 2) Use series configuration with boost converter to extract more energy, 3) Reduce system power consumption, 4) Use larger capacitance (200F, 300F). Always include margin for self-discharge (10-20% per day) and capacitor tolerance (-10% to +30%).
Calculate based on your system power; use multiple capacitors or larger values for extended backup.
What charging circuit do you recommend for this supercapacitor?
For the HJC-HC-100F-2.7V, charging circuit options: 1) Simple Resistor - R = V/I; for 5V supply, 1A charge: R = 5Ω. Charging time: t = 5RC = 5 × 5 × 100 = 2500s (42 min to 99%). Simple but slow and inefficient, 2) Constant Current Source - LM317 or dedicated IC; charges at constant rate then switches to voltage limit, 3) Dedicated Supercapacitor Charger - ICs like LTC3625, BQ24640 provide optimal charging profile, cell balancing, and protection, 4) DC-DC Converter - Buck converter with current limit; efficient but complex. Recommended: For single cell, use dedicated charger IC. For series configurations, use charger with built-in balancing. Charging specifications: Max voltage 2.7V, typical charge current 1-10A, charge time 10-60 minutes depending on current. Always include overvoltage protection.
Use dedicated supercapacitor charger IC for best performance; resistor limiting acceptable for slow charging.
Can I use this for regenerative braking in small EVs?
Yes, the HJC-HC-100F-2.7V can be used for small-scale regenerative braking: 1) Energy Recovery - Store braking energy that would otherwise be dissipated as heat, 2) Power Assist - Release stored energy during acceleration to reduce battery load, 3) Configuration - Use multiple cells in series/parallel for required voltage and capacitance. Example: 24V system using 10 cells in series (27V max): Ctotal = 100F/10 = 10F, Energy = 0.5 × 10 × (24² - 18²) = 1260J. For a 100kg vehicle at 20km/h (5.6m/s): Kinetic energy = 0.5 × 100 × 5.6² = 1568J. The supercapacitor can recover ~80% of braking energy. Limitations: 1) Limited energy storage vs batteries, 2) High cost for large arrays, 3) Requires DC-DC converter for voltage matching. Best for: Small EVs (e-bikes, scooters), forklifts, golf carts.
Suitable for small EVs; calculate required capacitance based on vehicle mass and speed; use with DC-DC converter.
How do I connect multiple capacitors for higher voltage systems?
For higher voltage with HJC-HC-100F-2.7V: 1) Series Connection - Connect positive to negative; voltages add, capacitance divides. Example: 10 in series for 27V system: Vtotal = 27V, Ctotal = 100F/10 = 10F, 2) Voltage Balancing - Critical for series connection; methods: a) Passive: 1kΩ-10kΩ resistors across each cell (simple but wastes power), b) Active: Dedicated balancing IC (efficient but complex), 3) Protection - Include overvoltage protection on each cell, 4) Monitoring - Monitor individual cell voltages during development. Series/Parallel combinations: For 48V system with 100F: Use 20 series (54V) × 2 parallel = 10F total. HJC offers pre-configured modules (16V, 32V, 48V) with integrated balancing and monitoring. Pre-built modules recommended for reliability and safety.
Use pre-built modules for reliability; implement active balancing for series configurations; never connect in series without balancing.
What is the cost comparison vs batteries for backup applications?
Cost comparison for HJC-HC-100F-2.7V vs batteries: 1) Initial Cost - Supercapacitor: ~$10-20; Coin cell battery (CR2032): ~$0.50; Li-ion battery: ~$5-10, 2) Lifetime Cost - Supercapacitor: 500,000+ cycles = 20+ years; Batteries: 500 cycles = 2-3 years, 3) Total Cost of Ownership - Over 10 years: Supercapacitor: $10-20 (no replacement), Coin cell: $2-5 (4-10 replacements), Li-ion: $25-50 (3-5 replacements). When supercapacitors make economic sense: 1) High-cycling applications (>10 cycles/day), 2) Long system lifetime (10+ years), 3) Maintenance-free operation required, 4) Extreme temperatures. When batteries are better: 1) Long backup times (hours/days), 2) Very low power (years on coin cell), 3) Cost-sensitive disposable products. For most industrial and automotive applications, supercapacitors provide lower total cost of ownership despite higher initial cost.
Supercapacitors have higher initial cost but lower lifetime cost for high-cycling or long-life applications.