Hammond 1539M09 2500uH 0.85A EMI/RFI Choke, Ferrite Bobbin Core

The 1539M09 is an EMI/RFI choke from the 1539 series, described by the manufacturer as a heavy duty RF hash choke. It is rated 2500 uH +/- 10% with a maximum DC current of 0.85 A, making it a practical choice for electronics designers and OEM engineers building filtering circuits or energy storage inductors.

The 1539M09 is the highest-inductance part in the compact 0.83 in by 0.91 in group at 2500 uH, and has the lowest DC current rating (0.85 A) in the 1539 series. Other 2500 uH values on the 1539 specification sheet are 1539M18 (1.6 A), 1539M24 (2.2 A) and 1539M30 (2.8 A), so compare current rating and body size when choosing.

The choke is built on a high saturation flux density ferrite bobbin core. It has 1 in long leads, tinned to within 1/8 in of the body. Maximum DC resistance is 2.04 ohms and the minimum Fo is 0.43 MHz.

• Inductance: 2500 uH +/- 10%
• Fo minimum: 0.43 MHz
• Maximum DC resistance: 2.04 ohms
• Maximum DC current: 0.85 A
• Maximum Dim. A: 0.83 in (21 mm); maximum Dim. B: 0.91 in (23 mm)
• Typical Dim. C: 0.71 in (18 mm); typical Dim. D: 0.04 in (1 mm)

Inductance for the 1539 series is measured at 1 kHz with 0 A DC current, and typical inductance change is less than 5% at twice rated current. The 1539M09 is RoHS and REACH compliant and has a shipping weight of 0.1 lbs (0.05 kg).