CDRH104R SMD Power Inductor of values 4.7uH (4R7), 6.8uH (6R8), 10uH (100), 68uH (680), 100uH (101) by BDTronics are high-quality surface mount inductor designed for reliable performance in compact electronics. Constructed with a ferrite drum core and copper winding, this magnetically shielded inductor ensures low electromagnetic interference and excellent DC-DC conversion performance. Its humidity tolerance rating of 1 and wide operating temperature range (-40°C to 100°C) make it ideal for laptops, game consoles, mobile devices, and portable electronics.

Features:

• High-quality ferrite core drum construction for stable inductance

• Copper wire winding for efficient current handling

• Magnetically shielded to reduce EMI and crosstalk

• Surface mount design (SMD) for compact PCB applications

• High humidity tolerance rating: 1

• Wide operating temperature range: -40°C to +100°C

• Lightweight and easy to solder on surface mount PCBs

• Ideal for use in DC-DC converters, power regulation circuits, and portable electronics

Specifications:

• Inductor Type: SMD Power Inductor

• Model: CDRH104R / CDR104R

• Material: Ferrite core

• Dimensions: 10mm × 10mm × 4mm

• Operating Temperature: -40°C to +100°C (including self-heating)

• Storage Temperature: -40°C to +100°C

• Weight: 1g

• Application: DC-DC converters in mobile phones, PDAs, MP3 players, DSC/DVC, portable DVD players, laptops, and game machines

• Magnetic Shielding: Yes

• Humidity Tolerance Rating: 1

Available Inductance Values:

• 4.7uH (4R7) SMD Power Inductor

• 6.8uH (6R8) SMD Power Inductor

• 10uH (100) SMD Power Inductor

• 68uH (680) SMD Power Inductor

• 100uH (101) SMD Power Inductor

Typical Electrical Performance

For different inductance values within the CDRH104R family, typical current ratings (which relate to theoratical power) are approximately:

(Saturation current = where inductance drops significantly; temperature‑rise current is often similar or slightly lower.)

How to Estimate Power

In a DC‑DC converter (buck/boost), the approximate inductor power loss is related to the R_DC​ and current flowing:

P_loss​≈I²×R_DC

​

Typical DCR values for these parts range from a few milliohms on the low‑inductance/high‑current parts to hundreds of milliohms on high‑inductance/low‑current parts.

For example, using a part like CDRH104R‑4R7:

• I_sat​ ≈ 5.5 A

• DCR ≈ 0.019 Ω
  → Worst‑case DC loss ≈ 5.5² × 0.019 ≈ 0.576 W

This is the electrical loss through the winding — not the total converter power rating.
The real usable power depends on your converter output voltage and current, but the inductor itself typically handles several watts of power in these mid‑range parts (e.g., a ~5 A inductor at a few volts is multi‑watt capable) as long as the current doesn’t exceed its ratings.

How to Use:

In real circuits you don’t specify “power rating” for an inductor, you ensure:

• Peak current is below the inductor’s saturation current

• RMS current is below the temperature‑rise current

• DC resistance and core losses keep heating acceptable

• Select the appropriate inductance value according to your DC-DC converter or power supply design.

• Mount the inductor onto the PCB using surface-mount soldering techniques.

• Ensure proper thermal management in high-current applications to maintain efficiency.

• Use in portable electronics, laptops, and game devices where compact, high-performance power regulation is required.
• Compatible with applications such as mobile phones, PDAs, MP3 players, cameras, and portable DVD players.

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