ELC-09D681F Equivalent & Substitute Parts

Part Overview

The ELC-09D681F is a 680 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 340 mA with 1.4Ohm DC resistance. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The through-hole radial mounting configuration and specific electrical characteristics define the scope for suitable substitutes.

Key Parameters

Parameter	Value
Inductance	680 µH
Tolerance	±10%
Current Rating	340 mA
DC Resistance (DCR)	1.4Ohm
Shielding	Unshielded
Mounting Type	Through Hole
Package / Case	Radial, Vertical Cylinder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ELC-09D681F is determined by strict equivalence across the following parameters:

Inductance Value: 680 µH ±10% tolerance
Current Rating: Minimum 340 mA (substitute must meet or exceed this specification)
DC Resistance: 1.4Ohm maximum
Mounting Configuration: Through-hole radial, vertical cylinder package
Shielding Type: Unshielded
Regulatory Compliance: ROHS3 compliant

The Würth Elektronik 744772681 meets all substitution criteria with a 350 mA current rating (exceeding the original 340 mA requirement) and identical inductance, tolerance, and DCR specifications.

Parameter Comparison

Parameter	ELC-09D681F (Panasonic)	744772681 (Würth Elektronik)	Match Status
Inductance	680 µH	680 µH	Equivalent
Tolerance	±10%	±10%	Equivalent
Current Rating (Amps)	340 mA	350 mA	Substitute Exceeds
DC Resistance (DCR)	1.4Ohm	1.4Ohm Max	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Radial, Vertical Cylinder	Radial, Vertical Cylinder (Open)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The Würth Elektronik 744772681 is a direct functional substitute for the obsolete ELC-09D681F. Both components maintain ROHS3 compliance and identical core electrical specifications. The substitute part carries active product status with current manufacturing availability (1272 pcs in stock versus 989 pcs for the original). The 350 mA current rating of the substitute provides a 10 mA margin above the original 340 mA specification, ensuring compatibility in existing circuit designs without derating requirements.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 744772681 be used as a direct replacement for the ELC-09D681F?

A: Yes. Both inductors share identical inductance (680 µH), tolerance (±10%), DC resistance (1.4Ohm), and mounting configuration (through-hole radial). The substitute's 350 mA current rating exceeds the original 340 mA requirement.

Q: What are the physical dimension differences between these parts?

A: The ELC-09D681F measures 0.374" diameter (9.50mm) with 0.350" seated height (8.90mm). The 744772681 measures 0.307" diameter (7.80mm) with 0.394" seated height (10.00mm). PCB layout verification is required to confirm fit within available space.

Q: Are both parts RoHS compliant?

A: Yes. Both the ELC-09D681F and 744772681 are ROHS3 compliant. The substitute additionally carries REACH Unaffected status.

Q: What is the inductance test frequency for each part?

A: The ELC-09D681F is tested at 10 kHz. The 744772681 is tested at 1 kHz. Both maintain the specified 680 µH inductance within ±10% tolerance at their respective test frequencies.

Q: Does the substitute part have a saturation current specification?

A: Yes. The 744772681 specifies a saturation current (Isat) of 600mA, providing additional margin above the 350 mA continuous current rating.

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