Würth Elektronik 7447789147 47µH Shielded Drum Core Wirewound Inductor

Part Overview

The Würth Elektronik 7447789147 is a 47µH shielded drum core wirewound inductor rated for 850mA continuous current with a maximum DC resistance of 360mOhm. This surface mount component is designed for applications requiring controlled inductance with electromagnetic shielding in compact form factors. The part maintains active product status with full RoHS3 compliance and AEC-Q200 automotive qualification. Equivalent and substitute parts are identified based on matching inductance value, shielding characteristics, surface mount packaging, and compatible current ratings within specified tolerance ranges.

Key Parameters

Parameter	Value
Inductance	47 µH
Tolerance	±20%
Current Rating	850 mA
DC Resistance (Max)	360 mOhm
Shielding	Shielded
Core Type	Drum Core, Wirewound
Mounting Type	Surface Mount
Package	Nonstandard (Tape & Reel)
Operating Temperature	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 7447789147 are qualified based on the following critical parameters:

Inductance Value: Exact match at 47µH with ±20% tolerance
Shielding: Shielded construction required for electromagnetic containment
Mounting: Surface mount technology with nonstandard package dimensions
Current Capacity: Rated current must support minimum 670mA operation; saturation current must exceed 770mA
DC Resistance: Maximum 360mOhm to maintain thermal and efficiency characteristics
Compliance: RoHS3 compliance and operating temperature range -40°C to 125°C minimum

The two qualified substitutes—Pulse Electronics P1166.473NLT and Bourns Inc. SRR7032-470M—meet these core electrical and mechanical requirements while maintaining compatibility with the original application envelope.

Parameter Comparison

Parameter	Würth 7447789147	Pulse P1166.473NLT	Bourns SRR7032-470M
Inductance	47 µH	47 µH	47 µH
Tolerance	±20%	±20%	±20%
Current Rating (Amps)	850 mA	830 mA	670 mA
Current - Saturation	1 A	830 mA	770 mA
DC Resistance (Max)	360 mOhm	260 mOhm	280 mOhm
Shielding	Shielded	Shielded	Shielded
Core Type	Drum Core, Wirewound	Wirewound	Drum Core, Wirewound
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size (L x W)	7.30mm x 7.30mm	7.54mm x 7.54mm	7.00mm x 7.00mm
Height (Max)	4.60 mm	4.61 mm	3.40 mm
Operating Temperature	-40°C to 125°C	-40°C to 130°C	-40°C to 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Pulse Electronics P1166.473NLT provides the lowest DC resistance at 260mOhm maximum, resulting in reduced power dissipation and improved thermal performance. This part maintains current rating of 830mA with extended operating temperature range to 130°C. Physical dimensions are slightly larger (7.54mm x 7.54mm) compared to the original part. All compliance certifications match the primary component.

Bourns Inc. SRR7032-470M offers the most compact footprint at 7.00mm x 7.00mm with the lowest profile height of 3.40mm. DC resistance is 280mOhm maximum. Current rating of 670mA is lower than the primary part; this substitute is suitable for applications with reduced current requirements. All compliance and temperature specifications align with the original component.

Both substitutes maintain RoHS3 compliance, REACH unaffected status, and MSL rating of 1. Selection between substitutes depends on application-specific priorities: thermal performance and current capacity favor the Pulse part, while space-constrained designs favor the Bourns part.

Frequently Asked Questions (FAQ)

Q: Can P1166.473NLT be used as a direct replacement for 7447789147 in all applications?

A: P1166.473NLT is electrically compatible for applications requiring up to 830mA continuous current. The slightly larger footprint (7.54mm vs 7.30mm) must be verified against PCB layout constraints. DC resistance is lower, which improves efficiency.

Q: What is the current limitation when using SRR7032-470M as a substitute?

A: SRR7032-470M is rated for 670mA continuous current with 770mA saturation current. Applications requiring the full 850mA rating of the original part must use either the primary component or the Pulse Electronics substitute.

Q: Are all three parts qualified for automotive applications?

A: The Würth 7447789147 carries AEC-Q200 qualification. The Pulse and Bourns substitutes do not list AEC-Q200 certification in the provided specifications. Automotive applications requiring this qualification must use the primary Würth component.

Q: How do the physical dimensions affect PCB layout compatibility?

A: Würth 7447789147: 7.30mm x 7.30mm x 4.60mm height. Pulse P1166.473NLT: 7.54mm x 7.54mm x 4.61mm height. Bourns SRR7032-470M: 7.00mm x 7.00mm x 3.40mm height. The Bourns part offers the smallest footprint; the Pulse part requires additional horizontal space.

Q: Do all substitutes maintain the same inductance tolerance?

A: All three parts specify ±20% inductance tolerance at the test frequency. The Würth part is tested at 1kHz, while both substitutes are tested at 100kHz. Frequency-dependent inductance variations must be evaluated for specific circuit applications.

Q: What is the moisture sensitivity level for these components?

A: All three parts carry MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

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