74477620 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 74477620 is a 100 µH unshielded drum core wirewound inductor rated for 1.02 A continuous current with a maximum DC resistance of 350mOhm. This surface mount component operates across the -40°C to 125°C temperature range and is classified as Active product status with ROHS3 compliance. Equivalent and substitute parts are identified when design requirements permit tolerance of specified electrical and mechanical parameter variations while maintaining functional compatibility in the target application.

Key Parameters

Parameter	Value	Unit
Inductance	100	µH
Inductance Tolerance	±10%	—
Current Rating	1.02	A
DC Resistance (Max)	350	mOhm
Core Type	Ferrite Drum Core	—
Shielding	Unshielded	—
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 74477620 is determined by strict equivalence across the following critical parameters:

Inductance value: 100 µH with ±10% tolerance
DC resistance: 350mOhm maximum
Current rating: minimum 970 mA (97% of primary part rating)
Core material and type: Ferrite drum core, unshielded
Operating temperature range: -40°C to 125°C minimum
Mounting configuration: Surface mount
Regulatory compliance: ROHS3 and REACH status

The Bourns SDR1006-101KL meets all substitution criteria. While the SDR1006-101KL exhibits a lower continuous current rating (970 mA versus 1.02 A) and different saturation current (1.7 A versus 1.1 A), it maintains electrical equivalence for applications where the primary part's full current capacity is not required. Physical dimensions vary slightly (9.80mm × 9.80mm × 5.80mm versus 10.00mm × 9.00mm × 5.90mm), requiring verification of PCB layout constraints.

Parameter Comparison

Parameter	74477620 (Würth Elektronik)	SDR1006-101KL (Bourns Inc.)	Compatibility Notes
Inductance	100 µH	100 µH	Equivalent
Inductance Tolerance	±10%	±10%	Equivalent
Current Rating	1.02 A	970 mA	Substitute rated lower; verify application current requirements
Current - Saturation	1.1 A	1.7 A	Substitute has higher saturation margin
DC Resistance (Max)	350 mOhm	350 mOhm	Equivalent
Core Type	Ferrite Drum Core, Unshielded	Ferrite Drum Core, Unshielded	Equivalent
Operating Temperature	-40°C to 125°C	-40°C to 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	Nonstandard	Nonstandard	Equivalent classification
Size / Dimension	10.00mm L × 9.00mm W	9.80mm L × 9.80mm W	Minor variation; PCB layout verification required
Height - Seated (Max)	5.90 mm	5.80 mm	Equivalent for clearance purposes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

Both the 74477620 and SDR1006-101KL are Active product status components with identical ROHS3 and REACH compliance certifications, ensuring regulatory equivalence for applications subject to these standards. Selection between the primary part and substitute should be based on:

Application current requirements: If continuous current demand exceeds 970 mA, the 74477620 is required. For applications operating at or below 970 mA, the SDR1006-101KL is functionally equivalent.
PCB layout constraints: The SDR1006-101KL footprint (9.80mm × 9.80mm) differs from the 74477620 (10.00mm × 9.00mm). Verify that the substitute dimensions accommodate existing PCB routing and component placement.
Inventory and lead time: The SDR1006-101KL maintains higher stock availability (6000 Pcs versus 2300 Pcs), which may influence procurement decisions.
Thermal performance: Both components operate across identical temperature ranges with equivalent thermal ratings.

Frequently Asked Questions (FAQ)

Q: Can the SDR1006-101KL replace the 74477620 in all applications?

A: The SDR1006-101KL is functionally equivalent for applications where the circuit current does not exceed 970 mA. If your design requires the full 1.02 A rating of the 74477620, the substitute is not appropriate. Verify your application's actual current draw before substitution.

Q: Are there physical compatibility concerns between these parts?

A: Both components are surface mount inductors with nonstandard package classifications. The SDR1006-101KL has slightly different footprint dimensions (9.80mm × 9.80mm versus 10.00mm × 9.00mm). Confirm that your PCB layout accommodates the substitute's footprint before implementation.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the 74477620 and SDR1006-101KL are ROHS3 compliant and REACH unaffected, meeting identical regulatory standards for restricted substance compliance.

Q: What is the difference in saturation current between these parts?

A: The 74477620 has a saturation current of 1.1 A, while the SDR1006-101KL is rated at 1.7 A. The substitute provides a higher saturation margin, which may offer improved performance stability in applications with transient current spikes.

Q: How do the DC resistance values compare?

A: Both parts specify a maximum DC resistance of 350mOhm, ensuring equivalent power dissipation characteristics and thermal behavior in the circuit.

Q: Are the inductance values and tolerances identical?

A: Yes. Both components are rated at 100 µH with ±10% tolerance, providing electrical equivalence for inductance-dependent circuit functions.

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