Würth Elektronik 744870004 Equivalent & Substitute Parts

Part Overview

The Würth Elektronik 744870004 is a shielded 2-coil inductor array designed for surface mount applications. This component features dual inductance configurations: 18.8 µH when coils are connected in series and 4.7 µH when connected in parallel. The part is classified as Active status and is ROHS3 compliant, making it suitable for modern electronic assemblies requiring regulated component specifications.

Substitute parts are identified when equivalent electrical and mechanical parameters align within the allowed tolerances for this inductor array category, enabling direct replacement in circuit designs without functional degradation.

Key Parameters

Parameter	Value
Manufacturer Part Number	744870004
Manufacturer	Würth Elektronik
Series	WE-DD
Number of Coils	2
Inductance - Parallel Configuration	4.7 µH
Inductance - Series Configuration	18.8 µH
Tolerance	±20%
Current Rating - Parallel	3.6 A
Current Rating - Series	1.8 A
DC Resistance (DCR) - Parallel	30 mOhm Max
Shielding	Shielded
Operating Temperature Range	-40°C to 125°C
Mounting Type	Surface Mount
Package / Case	Nonstandard
Size / Dimension	12.50 mm L x 12.50 mm W
Height	8.50 mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 744870004 are qualified based on the following critical parameters:

Dual-coil inductor array configuration with series and parallel inductance values within ±20% tolerance of the main part specifications
Inductance - Parallel: 4.7 µH nominal (4.8 µH acceptable within tolerance band)
Inductance - Series: 18.8 µH nominal (19 µH acceptable within tolerance band)
Shielded construction to maintain electromagnetic isolation
Surface mount nonstandard package with footprint dimensions of 12.50 mm x 12.50 mm
Operating temperature range of -40°C to 125°C
ROHS3 compliance and MSL 1 rating for assembly compatibility
Active product status ensuring ongoing availability and support

The identified substitutes meet these electrical and mechanical criteria, enabling functional equivalence in circuit applications.

Parameter Comparison

Parameter	744870004 (Würth Elektronik)	PF0553.472NL (Pulse Electronics)	SRF1280-4R7Y (Bourns Inc.)
Number of Coils	2	2	2
Inductance - Parallel	4.7 µH	4.8 µH	4.7 µH
Inductance - Series	18.8 µH	19 µH	18.8 µH
Tolerance	±20%	±20%	±30%
Current Rating - Parallel	3.6 A	8.1 A	8.25 A
Current Rating - Series	1.8 A	4.1 A	4.13 A
Current Saturation - Parallel	8 A	16 A	16.5 A
Current Saturation - Series	4 A	8.2 A	8.24 A
DC Resistance (DCR) - Parallel	30 mOhm Max	9.2 mOhm Max	14.6 mOhm Max
Shielding	Shielded	Shielded	Shielded
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size / Dimension	12.50 mm x 12.50 mm	12.50 mm x 12.50 mm	12.50 mm x 12.50 mm
Height	8.50 mm	8.71 mm	8.00 mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both substitute parts maintain Active product status with ROHS3 compliance and MSL 1 ratings, ensuring compatibility with current manufacturing and assembly standards.

PF0553.472NL (Pulse Electronics) provides inductance values within ±20% tolerance matching the original specification. This part offers improved current handling capability (8.1 A parallel rating versus 3.6 A) and reduced DC resistance (9.2 mOhm versus 30 mOhm), making it suitable for applications requiring lower losses or higher current capacity within the same footprint.

SRF1280-4R7Y (Bourns Inc.) delivers identical parallel inductance (4.7 µH) and series inductance (18.8 µH) specifications. This part features a ±30% tolerance band and the lowest profile height (8.00 mm versus 8.50 mm), with current ratings comparable to the Pulse Electronics alternative. The tighter height specification may be advantageous in space-constrained designs.

All three parts share identical footprint dimensions (12.50 mm x 12.50 mm), shielded construction, and operating temperature range, enabling direct mechanical and electrical substitution based on application requirements.

Frequently Asked Questions (FAQ)

Q: Can PF0553.472NL be used as a direct replacement for 744870004?

A: Yes. Both parts feature 2-coil shielded inductor arrays with matching parallel inductance (4.7 µH / 4.8 µH) and series inductance (18.8 µH / 19 µH) within acceptable tolerance bands. Identical footprint dimensions (12.50 mm x 12.50 mm) and surface mount configuration enable direct substitution. The PF0553.472NL offers superior current handling and lower DC resistance characteristics.

Q: What is the tolerance difference between substitute parts?

A: The 744870004 and PF0553.472NL both specify ±20% tolerance. The SRF1280-4R7Y specifies ±30% tolerance. All three parts meet the inductance value requirements within their respective tolerance bands, with the ±30% specification providing a wider acceptable range.

Q: Are height differences significant for PCB assembly?

A: Height variations exist: 744870004 (8.50 mm), PF0553.472NL (8.71 mm), and SRF1280-4R7Y (8.00 mm). These differences are minor and typically do not impact standard surface mount assembly processes. Verify clearance requirements in space-constrained applications before selection.

Q: Do all substitute parts maintain the same shielding characteristics?

A: Yes. All three parts are specified as shielded 2-coil inductor arrays, maintaining electromagnetic isolation properties required for the application.

Q: What compliance certifications apply to all parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting current regulatory and assembly requirements.

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