FDK CR17335SE

FDK CR17335SE 3V Lithium Cell (17×33.5 mm)

The FDK CR17335SE is a primary lithium manganese dioxide (Li-MnO2) cell in the CR123A class. It is designed for compact devices that demand dependable, long-term power such as detectors, cameras, meters, and industrial sensors.

Quick facts

When to choose it

• Devices with long standby and intermittent bursts (sensors, alarms, data loggers).
• Space-constrained designs needing predictable 3 V output and low self-discharge.
• Industrial builds where tabbed cells or robust holders are preferred for vibration resistance.

Avoid or reconsider if

• You need a rechargeable solution (consider 16340/RCR123A only if the device is rated for 3.6–3.7 V).
• Your device has sustained high current draw beyond typical CR123A capabilities (e.g., continuous hundreds of mA).
• Operating temperatures exceed the specified range (very cold or very hot environments).

Design and integration notes

1. Pulse handling: For radios, cameras, or solenoids, place a low-ESR bypass capacitor (e.g., 100–470 µF) near the load to support current spikes. Keep traces short.
2. Cutoff voltage: Start with a firmware cutoff in the 2.0–2.5 V range to avoid deep depletion; tune using the battery’s discharge curves from the datasheet.
3. Contacts and mounting: Use quality holders or tabbed cells to minimize contact resistance. For high shock/vibration, welded/soldered tabs are preferred over spring-only contacts.
4. Packs: If using cells in series/parallel, match brand, lot, and age. Never mix used and new cells. Incorporate appropriate fusing or PTCs as required by your safety analysis.
5. Storage and inventory: Store cool and dry. Mark install dates and rotate stock (FIFO) to maintain freshness.

Simple runtime estimate (example)

1. Find the rated capacity for your exact cell from the FDK datasheet (e.g., about 1.5 Ah for CR123A-class).
2. Compute average current. Example: 80 µA sleep + 40 mA for 0.1 s every 10 s → 80 µA + (0.1/10) × 40 mA = 0.48 mA.
3. Estimate runtime = capacity / average current. Example: 1.5 Ah / 0.00048 A ≈ 3125 h (~130 days). Apply a 20–30% margin for temperature, pulse loads, and aging, then validate with testing.

Compatibility notes

• Size: CR17335SE fits most CR123A compartments; confirm length tolerance if your enclosure is tight.
• Voltage: Devices labeled for “CR123A” typically expect 3 V primary cells. Do not substitute 16340/RCR123A (3.6–3.7 V) unless the device explicitly allows it.
• Terminals: Flat-top cells suit holders; tabbed versions are for packs/PCBs. Choose accordingly.

Alternatives

• Rechargeable option: 16340 (RCR123A) Li-ion, 3.6/3.7 V nominal—only if your device supports the higher voltage.
• More capacity: A larger Li-MnO2 size such as CR17450 (17×45 mm), or a multi-cell pack.
• Ultra-long life at low current: Lithium thionyl chloride (Li-SOCl2) cells offer very low self-discharge; verify size, voltage, and pulse capability differences.

Safety and handling

• Do not recharge, short-circuit, puncture, crush, or incinerate.
• Install with correct polarity and avoid mixing old and new cells.
• Lithium metal cells are regulated for transport (UN 3090/3091). Follow carrier and local regulations.
• Recycle or dispose according to local laws.

FAQ