Product Data Sheet Generated June 25, 2026
fair-rite.com

Planar Cores (7898400221*)

Part No. 7898400221

Part Number

7898400221

Description

98 PLANAR EI CORE SET

Part Type

Planar Cores

Frequency Range

98 Material

Application Type

Inductive Components

Where Used

Closed Magnetic Circuit

Material Grade

Ordering Information

Part Number: 7898400221

98 PLANAR EI CORE SET

Planar EE and EI cores, with their low profile are suitable for board level installation allowing assembly without the need for plastic coilformers and can also allow windings integrated into multi-level PCBs. Planar ER cores with their low mass and low profile are suitable for Surface Mount installations in low power filter and transformer applications.

Planar EE, ER and EI cores can be supplied with the center post gapped to a mechanical dimension, or an A_L value.

Mechanical Specifications

Weight: 4.1 (g)

Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).

Dim	mm	mm tol	nominal inch	inch misc.
A	18	± 0.35	0.709	_
B	4	± 0.15	0.157	_
C	10	± 0.30	0.394	_
D	1.8	min	0.071	min
E	13.7	min	0.540	min
F	4	± 0.20	0.157	_
G	2.4	± 0.15	0.094	_

Electrical Specifications

Chart Legend
Σl/A : Core Constant, l_e : Effective Path Length, A_e : Effective Cross-Sectional Area, V_e : Effective Core Volume
A_L : Inductance Factor
Explanation of Part Numbers: Digits 1 & 2 = product class and 3 & 4 = material grade.

Electrical Properties
AL(nH)	3300 ±25%
Ae(cm²)	0.421
Σl/A(cm⁻¹)	4.9
le(cm)	2.05
Ve(cm³)	0.863
Amin(cm²)	0.4

A_L value is measured at 1 kHz, B < 10 gauss.

This document was generated automatically from Fair-Rite's product database. For the most current specifications, visit fair-rite.com.