FDK CR17450SE

FDK CR17450SE Overview

The FDK CR17450SE is a 3 V lithium manganese dioxide (Li‑MnO2) primary battery in a 17×45 mm cylindrical format. It offers extended runtime in compact enclosures that cannot fit a full A-length cell yet outgrow shorter options like CR123A.

At a glance

• Nominal voltage: 3.0 V (flat discharge profile)
• Size: 17 mm diameter × 45 mm length (17450)
• Chemistry: Li‑MnO2 primary (non-rechargeable)
• Use case: Long standby with intermittent bursts
• Options: Bare cell or factory-welded solder tabs

When to Choose It

• Use if your device sleeps most of the time and draws modest current during scheduled events (sensors, meters, access control, data loggers, memory backup).
• Use if you need more capacity than CR123A but less length than a full A/17500 cell.
• Avoid if your design requires frequent high-current pulses without local capacitors, or continuous high drain (e.g., powerful radios, heaters, motors).
• Avoid if you need rechargeability; this is a primary cell.

Typical Applications

• Utility and sub-metering, AMR/AMI endpoints
• Environmental and condition monitoring nodes
• Security and fire alarm sensors, access control
• Data recorders, asset trackers (low-duty RF)
• Real-time clock and memory backup in controls

Design Guidance

1) Profile the load

• Measure sleep current, wake duration, pulse magnitude, and cadence.
• Target continuous loads in the microamp–low milliamp range for best life.

2) Handle pulse currents

• Add a low-ESR bypass capacitor near the load (e.g., 100–470 µF for short 50–300 mA RF bursts). Increase value at low temperatures.
• Keep wiring short and use wide traces to reduce voltage droop.

3) Mechanical integration

• Use tabbed cells for vibration-prone or fixed-orientation designs; avoid soldering directly to the cell can unless tabs are provided.
• For holders, verify spring pressure and contact resistance across temperature and vibration.

4) Temperature and environment

• Li‑MnO2 commonly supports a broad operating range (often around -20 °C to +60 °C); confirm exact limits in the FDK datasheet for your part number.
• Derate capacity at low temperatures and under high pulse duty cycles.

Estimating Runtime

Use average-current and derating to predict life, then validate with on-bench testing.

1. Compute average current: Iavg = Isleep + (Ipulse × tpulse / T) + other periodic loads.
2. Choose a usable capacity (from the datasheet) and apply environmental/pulse derating (e.g., 70–85% of nominal depending on your conditions).
3. Life (hours) ≈ UsableCapacity (mAh) / Iavg (mA).

Example: If Iavg ≈ 25 µA (0.025 mA) and usable capacity is 2000 mAh after derating, Life ≈ 2000 / 0.025 = 80,000 hours ≈ 9.1 years. Validate in your worst-case temperature and pulse profile.

Safety and Handling

• Do not recharge, crush, short, or incinerate.
• Observe polarity; use protective holders or keyed connectors.
• Use only approved tabbed versions for soldered assembly.
• Store in original packaging, cool and dry; rotate stock (first-in, first-out).

Alternatives and Compatibility

• Need shorter length? Consider CR123A (17×34.5 mm), with lower capacity.
• Need maximum capacity in similar diameter? Consider 17500/A-length (17×50 mm) variants if space allows.
• Need higher voltage or ultra-long life at very low drain? A 3.6 V Li‑SOCl2 cell may be suitable (check system voltage limits and pulse support).

FAQ

Is the CR17450SE rechargeable?

No. It is a primary lithium cell and must not be recharged.

How do I support high pulse currents?

Use a low-ESR capacitor close to the load, minimize series resistance, and verify droop at the coldest temperature.

Can I use two in series for 6 V systems?

Yes, if your electronics are rated for the higher fresh-cell voltage. Match cells from the same lot and age, and avoid mixing used with new.

What shelf life should I expect?

Li‑MnO2 chemistry typically has very low self-discharge (often around 1–2% per year). Verify shelf-life specs in the FDK datasheet and store properly.

Are solder tabs required?

Use tabbed cells for any design that requires soldering. Do not solder directly to the cell can unless factory tabs are provided.