CPH3225A Seiko Instruments Micro Energy Capacitor Polarised (Other) In Stock
Seiko Instruments CPH3225A is a reflow-solderable EDLC supercapacitor rated at 3.3V, 11 mF capacitance, and 160 Ohm ESR in a compact SMD package. Designed for backup power and energy harvesting applications, this ultracapacitor supports standard SMT reflow processes for automated PCB assembly.
- Manufacturer
- Seiko Instruments Micro Energy
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- CPH3225A Datasheet PDF
- Category
- Capacitor Polarised
- Price
- From $0.6656(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3.3 V rated voltage with 11 mF capacitance for compact energy storage
- 160 Ohm equivalent series resistance (ESR) suitable for low-power backup applications
- Reflow solderable construction compatible with standard SMT assembly processes up to 260°C
- EDLC double-layer capacitor technology for high cycle life exceeding 100,000 charge cycles
- Compact 3225 SMD package (3.2 mm × 2.5 mm) for space-constrained PCB designs
- Supports real-time clock backup, power glitch hold-up, and IoT energy buffering applications
Applications
The CPH3225A is used as a backup power source for real-time clock (RTC) circuits, volatile memory retention, and microcontroller state preservation during brief power interruptions in IoT devices and wearable electronics. Its reflow-compatible construction and 3.3 V rating make it ideal for energy harvesting systems, wireless sensor nodes, and portable consumer electronics where a small rechargeable energy buffer eliminates the need for a coin cell battery.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CPH3225A:
suggested
suggested
Frequently Asked Questions
What is the rated voltage and capacitance of the CPH3225A, and how long can it maintain a 3.3 V RTC circuit during a power outage?
The CPH3225A is rated at 3.3 V with 11 mF capacitance. Assuming an RTC draws approximately 1 µA at 3.3 V, the energy stored (about 60 µJ) can sustain the circuit for roughly 60 seconds before the voltage drops to the minimum operating level, making it suitable for short power interruptions in data logging and RTC backup applications.
How does the CPH3225A's 160 Ohm ESR affect its suitability for high-current pulse discharge applications?
The 160 Ohm ESR of the CPH3225A limits the peak discharge current to approximately 20 mA from a 3.3 V charge, which restricts this supercapacitor to low-current backup roles such as RTC memory retention and microcontroller state hold-up. Designs requiring high-pulse currents above 100 mA should select low-ESR supercapacitors below 1 Ohm for efficient energy delivery.
Is the CPH3225A compatible with standard reflow soldering, and what peak temperature does it withstand during SMT assembly?
Yes, the CPH3225A is specifically designed as a reflow-solderable EDLC supercapacitor, supporting standard SMT reflow profiles with peak temperatures up to 260°C. This compatibility eliminates the need for manual soldering or wave soldering exclusions, making it fully compatible with high-volume automated PCB assembly lines that process the 3.2 mm × 2.5 mm footprint alongside other SMD components.
How does the CPH3225A compare to a CR1220 coin cell for RTC backup in a compact IoT device?
The CPH3225A offers approximately 60 µJ of stored energy at 3.3 V compared to a CR1220 coin cell's 1800 mWh at 3 V, so the coin cell holds roughly 100 million times more energy for long-term RTC backup. However, the CPH3225A can be charged from the host supply in seconds, supports over 100,000 recharge cycles, and is reflow solderable without battery regulations, making it preferable for devices where brief backup is adequate and a permanently installed rechargeable solution is required.
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About Seiko Instruments Micro Energy
Seiko Instruments Micro Energy is a leading electronic component manufacturer. FindMyChip sources Seiko Instruments Micro Energy ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $3.4080 | $3.41 |
| 3+ | $0.6656 | $2.00 |
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