Equivalent & Substitute Parts for Würth Elektronik 74279230

Part Overview

The Würth Elektronik 74279230 is a 1210 (3225 Metric) surface mount ferrite bead designed for power line filtering applications. Specified at 32 Ohms impedance @ 100 MHz with a maximum current rating of 400mA and 300mOhm DC resistance, this component operates across the temperature range of -55°C to 125°C. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Impedance @ 100 MHz	32 Ohms
Current Rating (Max)	400mA
DC Resistance (Max)	300mOhm
Package / Case	1210 (3225 Metric)
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74279230 is determined by the following critical parameters:

Package / Case: Must be 1210 (3225 Metric) surface mount
Impedance @ 100 MHz: 30-31 Ohms (within acceptable tolerance range of the original 32 Ohms specification)
Current Rating: Minimum 400mA to meet or exceed original specification
DC Resistance: Maximum 300mOhm to maintain electrical performance
Operating Temperature Range: Must support -55°C to 125°C minimum
Mounting Type: Surface mount configuration required
Compliance: ROHS3 compliance required

All substitute parts listed meet these electrical and mechanical parameters, enabling direct functional replacement in applications originally designed for the 74279230.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Operating Temperature	Product Status	RoHS Status
74279230	Würth Elektronik	32 Ohms	400mA	300mOhm	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
742792310	Würth Elektronik	30 Ohms	3A	50mOhm	-55°C ~ 125°C	Active	ROHS3 Compliant
HF30ACB322513-T	TDK Corporation	31 Ohms	400mA	300mOhm	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
BMC2EY0031AN	TE Connectivity Passive Product	31 Ohms	500mA	100mOhm	-55°C ~ 125°C	Active	ROHS3 Compliant
FB322513T-310Y-S	Cal-Chip Electronics, Inc.	31 Ohms	500mA	100mOhm	-55°C ~ 125°C	Active	RoHS Compliant
ILBB1210ER310V	Vishay Dale	31 Ohms	400mA	300mOhm	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 742792310 (Würth Elektronik)

The 742792310 is the manufacturer-recommended substitute from Würth Elektronik. As an active product with enhanced specifications (3A current rating, 50mOhm DCR), it provides superior performance margins over the obsolete 74279230. Full compatibility with the original 1210 package and operating temperature range is maintained. ROHS3 compliance ensures regulatory alignment.

Secondary Recommendations: BMC2EY0031AN and FB322513T-310Y-S

Both parts offer parametric equivalence with improved current handling (500mA) and reduced DC resistance (100mOhm). BMC2EY0031AN from TE Connectivity and FB322513T-310Y-S from Cal-Chip Electronics are active products with extensive inventory availability. Both maintain the required operating temperature range and package specifications.

Alternative: ILBB1210ER310V (Vishay Dale)

This active product matches the original electrical specifications precisely (31 Ohms impedance, 400mA current, 300mOhm DCR) and supports the full -55°C to 125°C temperature range. It serves as a direct parametric equivalent for applications requiring exact specification matching.

Not Recommended: HF30ACB322513-T (TDK Corporation)

While electrically compatible, this part is obsolete and has a reduced operating temperature minimum of -40°C, which does not meet the original -55°C lower limit specification.

Frequently Asked Questions (FAQ)

Q: Can the 742792310 replace the 74279230 directly?

A: Yes. The 742792310 is the manufacturer-recommended substitute. Both parts share the 1210 (3225 Metric) package, identical operating temperature range (-55°C to 125°C), and compatible impedance specifications (30 Ohms vs. 32 Ohms @ 100 MHz). The 742792310 provides enhanced current capacity (3A vs. 400mA) and lower DC resistance (50mOhm vs. 300mOhm), making it suitable for direct replacement.

Q: What is the impedance tolerance for substitution?

A: Substitute parts with impedance values of 30-31 Ohms @ 100 MHz are acceptable alternatives to the original 32 Ohms specification. This range reflects standard ferrite bead impedance tolerances and maintains functional compatibility in power line filtering applications.

Q: Are all substitute parts RoHS compliant?

A: All listed substitutes meet RoHS compliance requirements. Five parts carry ROHS3 Compliant certification, and one (FB322513T-310Y-S) carries RoHS Compliant certification. Both certifications satisfy regulatory requirements for electronic component use.

Q: Does package size remain consistent across all substitutes?

A: Yes. All substitute parts maintain the 1210 (3225 Metric) surface mount package with identical physical dimensions (0.126" L x 0.098" W / 3.20mm x 2.50mm) and maximum height (0.059" / 1.50mm). Direct PCB footprint compatibility is assured.

Q: Which substitute offers the best current handling capability?

A: The 742792310, BMC2EY0031AN, and FB322513T-310Y-S all exceed the original 400mA specification. The 742792310 provides the highest current rating at 3A, while BMC2EY0031AN and FB322513T-310Y-S both support 500mA. Selection depends on application requirements and availability constraints.

Q: What is the moisture sensitivity level for all parts?

A: All substitute parts carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements. This matches the original 74279230 specification and simplifies inventory management.

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