MH1608-121T Equivalent & Substitute Parts

Part Overview

The MH1608-121T is a single-line ferrite bead manufactured by Bourns Inc., designed for power and signal line filtering applications. This 0603 (1608 Metric) surface mount component provides 120 Ohms impedance at 100 MHz with a maximum current rating of 2A and 100mOhm DC resistance. The part is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified to address inventory availability, lead time constraints, or specific application requirements where alternative electrical or mechanical characteristics remain within acceptable operational parameters.

Key Parameters

Parameter	Value	Unit
Impedance @ 100 MHz	120	Ohms
Current Rating (Maximum)	2	A
DC Resistance (Maximum)	100	mOhm
Package / Case	0603 (1608 Metric)	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-55 to 125	°C
Height (Maximum)	1.00	mm
Number of Lines	1	—
Filter Type	Power, Signal Line	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MH1608-121T are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Impedance @ 100 MHz: 120 Ohms (exact match required for primary substitutes)
Package / Case: 0603 (1608 Metric) (mandatory for mechanical compatibility)
Number of Lines: 1 (single-line configuration)
Operating Temperature Range: -55°C to 125°C (minimum requirement)
Mounting Type: Surface Mount (PCB assembly compatibility)

Secondary Consideration Parameters:

Current Rating (Maximum): Substitutes with equal or higher ratings are acceptable
DC Resistance (Maximum): Lower values indicate improved performance characteristics
Height (Maximum): Variations within 0.039" (1.00mm) to 0.026" (0.65mm) accommodate standard PCB assembly processes

Compliance Requirements:

RoHS3 Compliant status (mandatory)
Moisture Sensitivity Level 1 (Unlimited) (mandatory)
REACH Unaffected status (mandatory)

Substitute parts meeting all primary criteria and compliance requirements are classified as direct parametric equivalents. Parts with impedance values of 100 Ohms at 100 MHz are listed as alternative impedance options where application tolerance permits.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Impedance @ 100 MHz (Ohms)	Current Rating Max (A)	DC Resistance Max (mOhm)	Package / Case	Height Max (mm)	Operating Temperature (°C)	RoHS Status	MSL
MH1608-121T	Bourns Inc.	120	2	100	0603 (1608 Metric)	1.00	-55 to 125	ROHS3 Compliant	1
MH1608-101T	Bourns Inc.	100	3	40	0603 (1608 Metric)	1.00	-55 to 125	ROHS3 Compliant	1
MH1608-101Y	Bourns Inc.	100	3	40	0603 (1608 Metric)	1.00	-55 to 125	ROHS3 Compliant	1
MH1608-121Y	Bourns Inc.	120	2	100	0603 (1608 Metric)	1.00	-55 to 125	ROHS3 Compliant	1
2506031217Y2	Fair-Rite Products Corp.	120	2	50	0603 (1608 Metric)	0.95	-55 to 125	ROHS3 Compliant	1
BBHV00160808121Y00	Pulse Electronics	120	3	40	0603 (1608 Metric)	0.95	-55 to 125	ROHS3 Compliant	1
BBPY00160808101Y00	Pulse Electronics	100	2.5	50	0603 (1608 Metric)	0.95	-55 to 125	ROHS3 Compliant	1
BBPY00160808121Y00	Pulse Electronics	120	2.5	80	0603 (1608 Metric)	0.95	-55 to 125	ROHS3 Compliant	1
BBUP00160805121Y00	Pulse Electronics	120	3	25	0603 (1608 Metric)	0.65	-55 to 125	ROHS3 Compliant	1
BBUP00160808121Y00	Pulse Electronics	120	3	30	0603 (1608 Metric)	0.95	-55 to 125	ROHS3 Compliant	1
BLM18EG101TN1D	Murata Electronics	100	2	45	0603 (1608 Metric)	0.65	-55 to 125	ROHS3 Compliant	1

Engineering Selection Recommendations

Direct Parametric Equivalents (120 Ohms @ 100 MHz, 0603 Package):

The following parts provide direct substitution for the MH1608-121T based on matching impedance, package, and compliance specifications:

MH1608-121Y (Bourns Inc.): Identical electrical specifications with alternative packaging (Cut Tape & Digi-Reel® versus Tape & Reel). Suitable for applications requiring the same performance characteristics with different supply format.
2506031217Y2 (Fair-Rite Products Corp.): Matches 120 Ohms impedance and 2A current rating. DC resistance of 50mOhm is lower than the original 100mOhm, indicating reduced insertion loss. Height of 0.95mm accommodates standard PCB assembly clearances.
BBHV00160808121Y00 (Pulse Electronics): Provides 120 Ohms impedance with enhanced current rating of 3A and reduced DC resistance of 40mOhm. Height of 0.95mm is compatible with standard assembly processes.
BBPY00160808121Y00 (Pulse Electronics): Delivers 120 Ohms impedance with 2.5A current rating and 80mOhm DC resistance. Height of 0.95mm maintains assembly compatibility.
BBUP00160805121Y00 (Pulse Electronics): Offers 120 Ohms impedance with 3A current rating and 25mOhm DC resistance (lowest among substitutes). Reduced height of 0.65mm provides additional PCB clearance margin.
BBUP00160808121Y00 (Pulse Electronics): Provides 120 Ohms impedance with 3A current rating and 30mOhm DC resistance. Height of 0.95mm is standard for 0603 package assembly.

Alternative Impedance Options (100 Ohms @ 100 MHz, 0603 Package):

The following parts provide 100 Ohms impedance at 100 MHz and are suitable where application tolerance permits impedance variation:

MH1608-101T (Bourns Inc.): 100 Ohms impedance with enhanced 3A current rating and 40mOhm DC resistance. Identical package and compliance specifications.
MH1608-101Y (Bourns Inc.): 100 Ohms impedance with 3A current rating and 40mOhm DC resistance. Alternative packaging format (Cut Tape & Digi-Reel®).
BBPY00160808101Y00 (Pulse Electronics): 100 Ohms impedance with 2.5A current rating and 50mOhm DC resistance. Height of 0.95mm is compatible with standard assembly.
BLM18EG101TN1D (Murata Electronics): 100 Ohms impedance with 2A current rating and 45mOhm DC resistance. Reduced height of 0.65mm provides additional clearance.

All listed parts maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and REACH Unaffected status. All parts are classified as Active product status.

Frequently Asked Questions (FAQ)

Q: Can MH1608-121Y be used as a direct replacement for MH1608-121T?

A: Yes. Both parts are manufactured by Bourns Inc. with identical electrical specifications (120 Ohms @ 100 MHz, 2A maximum current, 100mOhm DC resistance) and package dimensions (0603 / 1608 Metric). The difference is packaging format: MH1608-121T is supplied in Tape & Reel (TR), while MH1608-121Y is supplied in Cut Tape (CT) & Digi-Reel®. Selection depends on assembly process requirements.

Q: What is the difference between 120 Ohms and 100 Ohms impedance substitutes?

A: Impedance determines the ferrite bead's filtering effectiveness at the specified frequency (100 MHz). A 120 Ohms bead provides higher attenuation than a 100 Ohms bead. Substitution with 100 Ohms impedance is acceptable only if application filtering requirements permit the lower impedance value. Verify circuit design specifications before selecting 100 Ohms alternatives.

Q: Are Pulse Electronics parts compatible with Bourns Inc. footprints?

A: Yes. All listed Pulse Electronics parts (BBHV, BBPY, BBUP series) share the identical 0603 (1608 Metric) package footprint as the MH1608-121T. Height variations (0.65mm to 0.95mm) are within standard PCB assembly tolerances and do not affect footprint compatibility.

Q: What does DC Resistance (DCR) represent, and why does it vary among substitutes?

A: DC Resistance is the resistive loss of the ferrite bead at direct current. Lower DCR values indicate reduced insertion loss and heat generation during operation. The MH1608-121T has 100mOhm DCR. Substitutes with lower DCR (such as BBUP00160805121Y00 at 25mOhm) provide improved efficiency. Higher DCR values (such as BBPY00160808121Y00 at 80mOhm) remain acceptable if current and thermal requirements are met.

Q: Can I use a 3A-rated substitute in place of the 2A-rated MH1608-121T?

A: Yes. A higher current rating indicates the substitute can safely handle equal or greater current levels. Substitutes with 3A ratings (such as BBHV00160808121Y00, BBUP00160805121Y00, or BBUP00160808121Y00) are suitable for applications requiring the original 2A rating. Verify that the substitute's DC resistance and thermal characteristics are acceptable for your specific application.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. The part can be stored and handled without special moisture control measures, and there are no time-to-reflow limitations after package opening. All listed substitutes maintain MSL 1 rating.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH Unaffected. These certifications confirm compliance with European Union hazardous substance restrictions and are suitable for applications requiring regulatory compliance.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel (TR) is continuous reel packaging suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® provides smaller quantities in tape format with reel options for mixed-volume production. Selection depends on assembly volume and inventory management requirements. Electrical and mechanical specifications remain identical regardless of packaging format.

Q: Can Fair-Rite 2506031217Y2 replace MH1608-121T in all applications?

A: The Fair-Rite 2506031217Y2 matches the 120 Ohms impedance and 2A current rating. However, it is classified as Signal Line filter type, while the MH1608-121T is classified as Power, Signal Line. Verify that your application does not require power line filtering capabilities before substituting with the Fair-Rite part.

Q: What is the impact of height variation among substitutes?

A: The MH1608-121T has a maximum height of 1.00mm. Substitutes range from 0.65mm to 0.95mm. Lower heights provide additional clearance above the PCB surface, which can be beneficial in space-constrained designs. All heights remain within standard 0603 package specifications and do not affect electrical performance or footprint compatibility.

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