CIB31P310NE Ferrite Bead 31 Ohm 1206 Equivalent & Substitute Parts

Part Overview

The CIB31P310NE is a 1206 surface mount ferrite bead manufactured by Samsung Electro-Mechanics, rated at 31 Ohms impedance at 100 MHz with a maximum current rating of 2A and 50mOhm DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The ferrite bead operates across the temperature range of -55°C to 125°C and is packaged in Cut Tape (CT) and Digi-Reel® formats. Equivalent and substitute parts must maintain the same package footprint (1206/3216 Metric), impedance characteristics, and thermal specifications to ensure direct replacement capability.

Key Parameters

Parameter	CIB31P310NE Value	Criticality for Substitution
Impedance @ 100 MHz	31 Ohms	Primary
Package / Case	1206 (3216 Metric)	Primary
Current Rating (Max)	2A	Primary
DC Resistance (Max)	50mOhm	Secondary
Operating Temperature	-55°C ~ 125°C	Secondary
Mounting Type	Surface Mount	Primary
Height (Max)	0.051" (1.30mm)	Secondary
RoHS Status	ROHS3 Compliant	Secondary

Substitute Part Grouping Explanation

Substitution logic for the CIB31P310NE is based on the following criteria:

Direct Equivalents maintain identical impedance (31 Ohms @ 100 MHz), package dimensions (1206/3216 Metric), and surface mount configuration. These parts satisfy all primary electrical and mechanical requirements.

Parametric Equivalents share the same package footprint and mounting type but vary in impedance (±1-2 Ohms tolerance range) or current rating. These parts are suitable when the application circuit design permits minor impedance deviation within the ferrite bead's frequency response curve.

Compatibility Factors:

Package / Case: 1206 (3216 Metric) is mandatory for all substitutes
Mounting Type: Surface Mount required
Impedance @ 100 MHz: 31 Ohms (direct) or 30-33 Ohms (parametric equivalent range)
Current Rating: Minimum 2A required; higher ratings provide design margin
DC Resistance: Lower values improve thermal performance
Operating Temperature: -55°C ~ 125°C minimum range required
RoHS Compliance: ROHS3 or equivalent environmental certification

Parameter Comparison

Part Number	Manufacturer	Impedance @ 100 MHz	Current Rating (Max)	DC Resistance (Max)	Operating Temperature	Product Status	Packaging
CIB31P310NE	Samsung Electro-Mechanics	31 Ohms	2A	50mOhm	-55°C ~ 125°C	Obsolete	Cut Tape (CT) & Digi-Reel®
742792112	Würth Elektronik	31 Ohms	3A	40mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
MI1206K310R-10	Laird-Signal Integrity Products	31 Ohms	1.5A	45mOhm	-40°C ~ 125°C	Active	Tape & Reel (TR)
2512063007Y3	Fair-Rite Products Corp.	30 Ohms	3A	30mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
742792111	Würth Elektronik	26 Ohms	3A	40mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
BBPY00321611300Y00	Pulse Electronics	30 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
BBPY00321611320Y00	Pulse Electronics	32 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
BBPY00321611330Y00	Pulse Electronics	33 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
HCB20-300-RC	Allied Components International	30 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
HCB20-310-RC	Allied Components International	31 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)
HCB20-320-RC	Allied Components International	32 Ohms	4A	15mOhm	-55°C ~ 125°C	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

The part 742792112 (Würth Elektronik WE-CBF series) provides direct electrical equivalence with 31 Ohms impedance at 100 MHz and maintains the identical operating temperature range. This part exceeds the current rating requirement (3A vs. 2A) and offers improved DC resistance (40mOhm vs. 50mOhm), resulting in lower thermal dissipation. Product status is Active with established supply chain availability.

The part HCB20-310-RC (Allied Components International) also matches the 31 Ohms specification with superior current handling (4A) and significantly lower DC resistance (15mOhm). This part is Active and suitable for applications requiring enhanced thermal performance.

Parametric Equivalents (Within Tolerance Range):

Parts with 30-33 Ohms impedance are suitable for applications where the ferrite bead's impedance tolerance permits ±1-2 Ohms deviation. These include:

BBPY00321611300Y00 (30 Ohms, 4A, 15mOhm) - Pulse Electronics
BBPY00321611320Y00 (32 Ohms, 4A, 15mOhm) - Pulse Electronics
BBPY00321611330Y00 (33 Ohms, 4A, 15mOhm) - Pulse Electronics
HCB20-300-RC (30 Ohms, 4A, 15mOhm) - Allied Components International
HCB20-320-RC (32 Ohms, 4A, 15mOhm) - Allied Components International
2512063007Y3 (30 Ohms, 3A, 30mOhm) - Fair-Rite Products Corp.

All parametric equivalents maintain the 1206 package footprint, surface mount configuration, and -55°C to 125°C operating range. These parts are Active status with established supply availability.

Limited Compatibility:

The part MI1206K310R-10 (Laird-Signal Integrity Products) matches impedance at 31 Ohms but has a reduced current rating of 1.5A, which is below the original 2A specification. This part is suitable only for applications with current requirements below 1.5A.

The part 742792111 (Würth Elektronik, 26 Ohms) deviates significantly from the 31 Ohms specification and is suitable only for applications with different impedance requirements.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance or equivalent environmental certification. All parts are packaged in Tape & Reel (TR) format, which differs from the original Cut Tape (CT) and Digi-Reel® packaging but is standard for production environments.

Frequently Asked Questions (FAQ)

Q: Can I use a ferrite bead with 30 Ohms impedance instead of 31 Ohms?

A: Yes, if the application circuit design permits impedance tolerance within ±1-2 Ohms. Ferrite beads operate across a frequency spectrum, and minor impedance variations at 100 MHz typically do not affect circuit performance in EMI suppression applications. Verify the specific frequency response requirements of your circuit design.

Q: What is the difference between Direct Equivalents and Parametric Equivalents?

A: Direct Equivalents (such as 742792112 and HCB20-310-RC) maintain identical 31 Ohms impedance at 100 MHz and are suitable for direct substitution without circuit modification. Parametric Equivalents (such as BBPY00321611300Y00 and HCB20-300-RC) vary in impedance by ±1-2 Ohms and require verification that the application circuit tolerates this deviation.

Q: Why do substitute parts have higher current ratings than the original CIB31P310NE?

A: Higher current ratings indicate improved thermal design and lower DC resistance in the substitute parts. A 4A-rated ferrite bead with 15mOhm DC resistance dissipates less heat than a 2A-rated part with 50mOhm resistance at the same current level. This provides design margin and improved reliability in applications operating near the current limit.

Q: Is the packaging change from Cut Tape (CT) to Tape & Reel (TR) significant?

A: Tape & Reel (TR) packaging is standard for automated assembly processes and is compatible with standard pick-and-place equipment. Cut Tape (CT) is typically used for manual assembly or small-volume production. For production environments, TR packaging is preferred and does not affect component performance.

Q: Can I use HCB20-310-RC as a direct replacement for CIB31P310NE?

A: Yes. HCB20-310-RC matches the 31 Ohms impedance specification, maintains the 1206 package footprint, and exceeds the current rating and thermal performance requirements. This part is Active status with established supply availability and is suitable for direct substitution.

Q: What is the significance of DC Resistance (DCR) in ferrite bead selection?

A: DC Resistance determines the resistive losses and heat dissipation in the ferrite bead during operation. Lower DCR values (such as 15mOhm in BBPY and HCB20 series) result in reduced power loss and improved thermal performance compared to higher DCR values (such as 50mOhm in the original CIB31P310NE). For applications with sustained current flow, lower DCR is advantageous.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts maintain ROHS3 compliance or equivalent environmental certification. The original CIB31P310NE is ROHS3 Compliant, and all substitute parts listed meet or exceed this standard.

Q: What should I verify before selecting a substitute part?

A: Verify the following parameters: (1) Impedance tolerance at 100 MHz within your circuit's acceptable range, (2) Current rating meets or exceeds your application requirement, (3) Operating temperature range covers your design environment, (4) Package footprint (1206/3216 Metric) matches your PCB layout, (5) Product status is Active for supply chain continuity, (6) DC Resistance is acceptable for your thermal budget.

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