SC2506-681 Equivalent & Substitute Parts

Part Overview

The SC2506-681 is a 680 µH unshielded surface mount inductor manufactured by Signal Transformer, rated for 140 mA continuous current with a maximum DC resistance of 15.3Ohm. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

Substiute Parts

SC2506-681

Signal TransformerIn Stock: 773SC2506-681 Datasheet

Current PartRFQ

SRR0805-681K

Bourns Inc.In Stock: 654SRR0805-681K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SRR0805-681K from Bourns Inc. qualifies as a functional equivalent based on the following critical parameters:

• Inductance Match: Both parts specify 680 µH, meeting the primary electrical requirement
• Surface Mount Configuration: Both use surface mount technology for PCB integration
• Current Capability: The SRR0805-681K provides 170 mA rating, exceeding the SC2506-681 requirement of 140 mA
• Compliance Alignment: Both parts are ROHS3 compliant with MSL 1 rating
• Active Product Status: The SRR0805-681K is actively manufactured, ensuring supply chain continuity

Substitution is valid where the application tolerates the dimensional differences and improved electrical characteristics of the Bourns part.

Parameter Comparison

Engineering Selection Recommendations

The SRR0805-681K is suitable as a substitute for the obsolete SC2506-681 in applications where the following conditions are met:

• PCB layout accommodates the larger footprint (0.413" L x 0.315" W versus 0.364" L x 0.310" W)
• Vertical clearance allows for increased height (0.185" versus 0.065")
• The shielded construction of the SRR0805-681K does not introduce unintended coupling effects in the circuit
• Lower DC resistance (3.4Ohm versus 15.3Ohm) is acceptable or beneficial to circuit performance
• Tighter inductance tolerance (±10% versus ±20%) meets or exceeds design specifications

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SRR0805-681K directly replace the SC2506-681 on existing PCBs?

A: Direct PCB replacement requires layout verification. The SRR0805-681K has a larger footprint (0.413" L x 0.315" W) and greater height (0.185") compared to the SC2506-681 (0.364" L x 0.310" W, 0.065" height). Pad spacing and clearance must be confirmed before substitution.

Q: What is the impact of the shielded versus unshielded construction?

A: The SRR0805-681K features shielded construction while the SC2506-681 is unshielded. Shielding reduces electromagnetic radiation and susceptibility. In noise-sensitive circuits, this may improve performance. In applications where unshielded operation is critical, circuit validation is required.

Q: How do the DC resistance values affect circuit operation?

A: The SRR0805-681K has significantly lower DC resistance (3.4Ohm Max) compared to the SC2506-681 (15.3Ohm Max). This reduces power dissipation and heat generation. For current-limited applications, this improvement is beneficial. Verify that lower resistance does not alter intended circuit behavior.

Q: Are both parts suitable for the same operating temperature range?

A: The SC2506-681 does not specify an operating temperature range in the provided data. The SRR0805-681K operates from -40°C to 125°C. Confirm that the SRR0805-681K temperature range meets application requirements.

Q: What is the difference in inductance tolerance between these parts?

A: The SC2506-681 has ±20% tolerance while the SRR0805-681K has ±10% tolerance. The tighter tolerance of the SRR0805-681K provides greater inductance consistency, which may improve circuit stability and performance predictability.

Q: Are packaging and supply chain considerations different?

A: The SC2506-681 is obsolete with limited remaining inventory (758 Pcs). The SRR0805-681K is actively manufactured and available in Tape & Reel packaging (638 Pcs in stock), ensuring long-term supply continuity and standard handling compatibility.