Hammond 1530B684 680uH Sub-Miniature RF Choke, 87 mA Iron Core

The 1530B684 is a sub-miniature R.F. choke from the Hammond 1530 Series, rated at 680 uH with an inductance tolerance of +/- 5%. It is a mid-range inductance coil for engineers and OEM designers who need a compact inductor for network, filter and delay line circuits, the applications the 1530 Series is intended for.

Performance is specified with L and Q values measured on a Q meter. This part is rated for a minimum Q of 37 at a test frequency of 0.79 MHz, with a minimum Fo of 1.6 MHz. Maximum DC resistance is 19.8 ohms and the maximum DC current is 87 mA, a low-current rating typical of the high-value coils in this series, suited to signal-level and bias circuits.

Construction is a varnish-impregnated coil wound over an iron core. The 1530B684 has a form length of 0.25 in (6 mm) (tolerance +/- 0.03 in) and a maximum coil diameter rating of 0.2, keeping it within the series' subminiature size range of .25" to .63". Shipping weight is 0.1 lbs (0.05 kg).

Key ratings at a glance:

• Inductance: 680 uH, +/- 5%
• Q minimum: 37 at 0.79 MHz
• Fo minimum: 1.6 MHz
• DC resistance maximum: 19.8 ohms
• DC current maximum: 87 mA

The 1530B684 is listed as RoHS compliant and REACH compliant, and carries UPC 623980292236 and UNSPSC code 39121301. Hammond notes that the 1530 Series will soon be discontinued as a stocked series and is available while quantities last.