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Product Detailed Parameters
- Description：FIXED IND 240UH 115MA 7.8 OHM TH
- Series：1537R
- Mfr：Delevan
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Molded
- Material - Core：Iron
- Inductance：240 µH
- Tolerance：±5%
- Current Rating (Amps)：115 mA
- Current - Saturation (Isat)：-
- Shielding：Unshielded
- DC Resistance (DCR)：7.8Ohm Max
- Q @ Freq：65 @ 790kHz
- Frequency - Self Resonant：5.9MHz
- Ratings：-
- Operating Temperature：-55°C ~ 105°C
- Inductance Frequency - Test：790 kHz
- Mounting Type：Through Hole
- Package / Case：Axial
- Supplier Device Package：-
- Size / Dimension：0.156" Dia x 0.375" L (3.96mm x 9.53mm)
- Height - Seated (Max)：-
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Overview
The Delevan 1537R-94J is a leaded RF inductor with an inductance of 240 uH and a tolerance of 5%. It features a molded, unshielded construction with axial termination for PCB mounting. The component has a maximum DC resistance of 7.8 Ohms and supports a maximum DC current of 115 mA. It operates within a temperature range of -55 C to +125 C. Key electrical parameters include a minimum Q of 65 and a self-resonant frequency of 5.9 MHz. Physical dimensions are 9.53 mm in length and 3.96 mm in diameter, utilizing phenolic core material.
Feature Summary
- Molded unshielded coil design for radio frequency applications
- Axial leaded termination suitable for printed circuit board mounting
- Phenolic core material construction
Applications
- Radio frequency circuits
- RF filtering networks
- Impedance matching stages
Procurement Notes
Verify the specific ordering suffix against manufacturer documentation to ensure correct tolerance and packaging configuration. Confirm that the axial lead style matches the target PCB footprint requirements. Check for RoHS compliance status as indicated in official specifications, noting that some listings may indicate non-compliance. Ensure storage conditions align with the specified operating temperature range to maintain component integrity prior to assembly.
Selection Notes
Select this component when a high-inductance value of 240 uH is required in a compact axial form factor. The unshielded design necessitates careful layout planning to minimize electromagnetic interference with adjacent traces. Verify that the 115 mA current rating meets the application's peak load requirements. Consider the 5.9 MHz self-resonant frequency limit to ensure operation remains below the resonant point for intended inductive behavior.
Part Context
This part belongs to the Delevan 1537/R series of fixed RF inductors. The series offers various inductance values and tolerances within a standardized physical envelope. The 'R' designation typically indicates specific manufacturing or reliability characteristics within the product line. These components are designed for general-purpose RF applications requiring reliable performance in a through-hole format.
Replacement Considerations
Direct substitutes must match the 240 uH inductance, 5% tolerance, and 7.8 Ohm DC resistance. Compatible alternatives should share the axial leaded package and similar physical dimensions (9.53 mm x 3.96 mm). Verify that any replacement maintains the same self-resonant frequency and current handling capabilities.
