Hammond 1538M21 5uH 23A EMI/RFI Choke, Ferrite Rod Core

The 1538M21 is an EMI/RFI choke from the 1538 series, described by the manufacturer as a heavy duty RF hash choke. It is rated 5 uH +/- 10% with a maximum DC current of 23 A, making it a practical choice for electronics designers and OEM engineers building filtering circuits or energy storage inductors.

The 1538M21 has the highest DC current rating (23 A) and the lowest DC resistance (0.004 ohms) in the entire 1538 series at 5 uH, with a 30.8 MHz self-resonant frequency. Other 5 uH values on the 1538 specification sheet are 1538M01 (10 A), 1538M08 (14 A) and 1538M15 (19 A), so compare current rating and body size when choosing.

The choke is built on a high saturation flux density ferrite rod. It has 1 in long leads, tinned to within 1/8 in of the body. The 1538 series is specified for an ambient temperature range of -60 C to +85 C.

• Inductance: 5 uH +/- 10%
• Self-resonant frequency: 30.8 MHz
• Maximum DC resistance: 0.004 ohms
• Maximum DC current: 23 A
• Maximum Dim. A: 1.38 in (35 mm); maximum Dim. B: 0.72 in (18 mm)
• Typical Dim. C: 0.94 in (24 mm); typical Dim. D: 0.08 in (2 mm)

Inductance for the 1538 series is measured at 1 kHz with 0 A DC current, and typical inductance change is less than 5% at twice rated current. The 1538M21 is RoHS and REACH compliant and has a shipping weight of 0.1 lbs (0.05 kg).