74479632 Equivalent & Substitute Parts Reference

Part Overview

The Würth Elektronik 74479632 is an unshielded multilayer inductor with 470 nH inductance, designed for surface mount applications in the 0603 (1608 Metric) package. This component operates across the industrial temperature range of -55°C to 125°C and is classified as Active product status with full RoHS3 compliance. Equivalent and substitute parts are identified when design requirements permit relaxation of specific electrical or mechanical constraints while maintaining core functional parameters.

Substiute Parts

74479632

Würth ElektronikIn Stock: 81474479632 Datasheet

Current PartRFQ

CS160808-R47K

Bourns Inc.In Stock: 6403CS160808-R47K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74479632 is permissible when the following conditions are satisfied:

Critical Matching Parameters:

• Inductance value: 470 nH (exact match required)
• Inductance tolerance: ±10% (substitute tolerance must be equal or tighter)
• Package / Case: 0603 (1608 Metric) (exact match required for PCB footprint compatibility)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -55°C to 125°C minimum (substitute must support this range)
• RoHS3 Compliance: Required (substitute must maintain regulatory status)

Performance Parameters (Substitute Must Meet or Exceed):

• Current Rating: 35 mA minimum
• DC Resistance: 1 Ohm maximum

Flexible Parameters:

• Shielding: The main part is unshielded. Shielded substitutes are acceptable if all critical and performance parameters are satisfied, as shielding provides additional EMI isolation without compromising core inductance specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: 74479632 (Würth Elektronik WE-MI Series)

The 74479632 is the specified component and remains the first choice when availability and cost are not constraints. This part maintains Active product status with confirmed inventory of 738 pieces in stock.

Approved Substitute: CS160808-R47K (Bourns Inc. CS160808 Series)

The Bourns CS160808-R47K qualifies as a direct substitute based on the following engineering criteria:

1. Electrical Equivalence: Inductance value (470 nH) and tolerance (±10%) are identical. Current rating (150 mA) and DC resistance (700 mOhm) both exceed the 74479632 requirements (35 mA, 1 Ohm max), providing design margin.

2. Mechanical Compatibility: Package designation (0603 / 1608 Metric), footprint dimensions (1.60mm x 0.80mm), and seated height (0.95mm vs. 1.00mm) are compatible with PCB layouts designed for the primary part.

3. Thermal Compatibility: Operating temperature range (-55°C to 125°C) is identical, ensuring equivalent performance across all specified environmental conditions.

4. Regulatory Compliance: Both parts maintain RoHS3 compliance, REACH Unaffected status, and MSL Level 1 (Unlimited) moisture sensitivity rating.

5. Performance Enhancement: The substitute exhibits superior Q factor (30 @ 25MHz vs. 15 @ 25MHz) and lower DC resistance, reducing thermal dissipation in the application circuit.

6. Shielding Consideration: The CS160808-R47K is shielded, whereas the 74479632 is unshielded. In applications where EMI isolation is beneficial, the shielded substitute provides additional electromagnetic containment without altering core inductance specifications.

Substitution Constraints:

The CS160808-R47K is suitable for direct substitution only when the application circuit does not require the specific unshielded characteristic of the primary part. If unshielded operation is a design requirement, the 74479632 must be retained.

Frequently Asked Questions (FAQ)

Q1: Can the CS160808-R47K (Bourns) be used as a direct replacement for the 74479632 (Würth Elektronik)?

A: Yes, the CS160808-R47K meets all critical electrical and mechanical parameters. Both components have identical inductance (470 nH), tolerance (±10%), package (0603), operating temperature range (-55°C to 125°C), and regulatory compliance (RoHS3). The Bourns substitute exceeds current rating and DC resistance specifications, providing additional design margin.

Q2: What is the difference between shielded and unshielded inductors, and does it affect substitution?

A: Shielded inductors contain ferrite or metal shielding that reduces electromagnetic field radiation and susceptibility to external EMI. Unshielded inductors have no such containment. The 74479632 is unshielded; the CS160808-R47K is shielded. For most applications, the shielded substitute is acceptable and provides EMI benefits. Substitution is not recommended only if the circuit design specifically requires unshielded operation.

Q3: Are the physical dimensions compatible between these two parts?

A: Yes. Both parts use the 0603 (1608 Metric) package with identical footprint dimensions (1.60mm length x 0.80mm width). The seated height of the CS160808-R47K (0.95mm) is slightly lower than the 74479632 (1.00mm), which is within acceptable tolerance for PCB assembly and does not affect electrical performance.

Q4: Do both parts have the same current rating?

A: No. The 74479632 has a current rating of 35 mA, while the CS160808-R47K is rated for 150 mA. The substitute exceeds the primary part's current specification, making it suitable for applications requiring the 35 mA rating and providing additional headroom for circuit variations.

Q5: What is the DC resistance difference, and does it matter?

A: The 74479632 specifies 1 Ohm maximum DC resistance; the CS160808-R47K specifies 700 mOhm maximum. The lower resistance of the substitute reduces I²R losses and heat generation, which is beneficial in most applications. This difference does not prevent substitution.

Q6: Are both parts RoHS3 compliant?

A: Yes. Both the 74479632 and CS160808-R47K are RoHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic components.

Q7: What is the Q factor, and why does the substitute have a higher value?

A: Q factor (quality factor) measures the ratio of energy stored to energy dissipated in a component at a specific frequency. The CS160808-R47K has a Q of 30 @ 25MHz compared to 15 @ 25MHz for the 74479632. Higher Q indicates lower losses and better efficiency. The substitute's superior Q factor is an additional performance benefit.

Q8: Can I use the 74479632 in applications designed for the CS160808-R47K?

A: Generally yes, provided the application does not require the shielded characteristics of the Bourns part. The 74479632 meets the same inductance, tolerance, and current specifications. However, if EMI shielding is a design requirement, the unshielded primary part may not be suitable.

Q9: What is the self-resonant frequency, and is the difference significant?

A: Self-resonant frequency (SRF) is the frequency at which the inductor's impedance is purely resistive. The 74479632 has an SRF of 120 MHz; the CS160808-R47K has an SRF of 105 MHz. Both values are well above typical operating frequencies for 470 nH inductors. The difference does not affect substitution suitability for standard applications.

Q10: Are there any packaging or supply chain differences between these parts?

A: The 74479632 is supplied in standard packaging (not specified in detail). The CS160808-R47K is supplied in Tape & Reel (TR) format. Both are available in stock with substantial inventory (738 pieces for Würth, 6351 pieces for Bourns). Packaging format may affect procurement logistics but does not affect electrical or mechanical compatibility.