ELL-8TP681MB Equivalent & Substitute Parts

Part Overview

The ELL-8TP681MB is a 680 µH shielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 430 mA continuous current with 1.3Ohm DC resistance. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part features nonstandard corner terminals and surface mount packaging in an 8.00mm x 8.00mm footprint.

Substiute Parts

ELL-8TP681MB

Panasonic Electronic ComponentsIn Stock: 882ELL-8TP681MB Datasheet

Current PartRFQ

74404086681

Würth ElektronikIn Stock: 657874404086681 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELL-8TP681MB is determined by the following critical parameters:

• Inductance Value: Must be 680 µH with ±20% tolerance
• Current Rating: Minimum 430 mA continuous current capability
• DC Resistance: Acceptable range 1.3Ohm to 1.65Ohm (within functional limits for power dissipation)
• Saturation Current: Minimum 300 mA
• Mounting Type: Surface mount configuration required
• Footprint Compatibility: 8.00mm x 8.00mm base dimensions
• Operating Temperature: Minimum -40°C ~ 105°C range
• RoHS Compliance: ROHS3 Compliant status required

The Würth Elektronik 74404086681 meets these substitution criteria with equivalent inductance, higher current rating (530 mA), compatible DC resistance (1.65Ohm), and matching footprint dimensions. Height variation (6.50mm vs 5.00mm) must be evaluated for specific PCB layout constraints.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 74404086681 is the qualified substitute for the obsolete ELL-8TP681MB based on the following factors:

Compliance & Availability: The 74404086681 maintains active product status with 6539 units in stock, ensuring procurement continuity. Both components are ROHS3 compliant with identical moisture sensitivity ratings (MSL 1).

Electrical Performance: The substitute provides superior current handling (530 mA vs 430 mA) and saturation current (1 A vs 300 mA), offering design margin for the same 680 µH inductance value. The DCR increase from 1.3Ohm to 1.65Ohm represents a 27% rise in DC resistance, which must be evaluated for power dissipation impact in the specific application circuit.

Thermal & Environmental: The Würth part extends the operating temperature range to -40°C ~ 125°C, providing 20°C additional high-temperature capability. The 1.6 MHz self-resonant frequency is specified for the substitute.

Physical Considerations: Both components share the 8.00mm x 8.00mm footprint. The height difference (6.50mm vs 5.00mm) requires verification against PCB clearance and assembly constraints. The substitute features semi-shielded construction versus full shielding on the original, which may affect EMI performance in sensitive applications.

Certifications: The Würth component carries AEC-Q200 automotive qualification and REACH unaffected status, providing additional quality assurance for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 74404086681 directly replace the ELL-8TP681MB without circuit modification?

A: Electrical substitution is feasible for applications where the 27% increase in DC resistance (1.3Ohm to 1.65Ohm) does not exceed power dissipation limits. The higher current rating (530 mA) and saturation current (1 A) provide design margin. Physical verification of the 1.5mm height difference is required for PCB assembly compatibility.

Q: What is the impact of semi-shielded versus shielded construction?

A: The original ELL-8TP681MB features full shielding, while the 74404086681 is semi-shielded. In applications requiring maximum EMI suppression or operating in high-noise environments, the reduced shielding effectiveness of the substitute must be evaluated through circuit testing or electromagnetic simulation.

Q: Are there any temperature-related limitations?

A: The substitute operates to 125°C versus 105°C for the original, providing extended high-temperature capability. Both components maintain the same -40°C lower limit. Application thermal profiles should be verified against the extended range of the substitute.

Q: How does the core material difference affect performance?

A: The original uses wirewound construction, while the substitute employs drum core wirewound design with ferrite material. This affects frequency response characteristics and EMI behavior. The substitute specifies a 1.6 MHz self-resonant frequency, which should be compared against the original design's frequency requirements.

Q: What packaging considerations apply to the substitute?

A: The 74404086681 is supplied in Tape & Reel (TR) format with a nonstandard 8065 supplier device package. Verify compatibility with existing pick-and-place equipment and tape specifications for automated assembly processes.