MDMK2020T3R3MM Equivalent & Substitute Parts

Part Overview

The MDMK2020T3R3MM is a 3.3 µH shielded drum core wirewound inductor manufactured by Taiyo Yuden, rated for 1.15 A continuous current with a maximum DC resistance of 178 mOhm. This component is designed for surface mount applications in nonstandard 2.00mm x 2.00mm packages. The part carries a "Not For New Designs" product status, indicating that Taiyo Yuden has discontinued active development and support for this model. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to actively supported alternatives that meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Inductance	3.3	µH
Inductance Tolerance	±20	%
Current Rating	1.15	A
Current - Saturation (Isat)	1.35	A
DC Resistance (DCR) Maximum	178	mOhm
Shielding	Shielded	—
Core Material	Metal	—
Mounting Type	Surface Mount	—
Package Dimensions	2.00 x 2.00 x 1.20	mm (L x W x H)
Operating Temperature Range	-40 to 125	°C
Inductance Test Frequency	1	MHz
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MDMK2020T3R3MM are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters:

Inductance value: 3.3 µH
Inductance tolerance: ±20%
Current rating: 1.15 A minimum
Saturation current (Isat): 1.35 A minimum
DC resistance: 178 mOhm maximum
Shielding: Shielded configuration required

Mechanical Parameters:

Mounting type: Surface mount
Package dimensions: 2.00mm L x 2.00mm W x 1.20mm H maximum
Core type: Metal core, wirewound construction

Environmental & Compliance Parameters:

Operating temperature range: -40°C to 125°C
RoHS3 compliance required
Moisture sensitivity level: 1 (Unlimited)

The LSDND2020MKT3R3MM meets all specified electrical, mechanical, and compliance requirements and qualifies as a direct substitute.

Parameter Comparison

Parameter	MDMK2020T3R3MM	LSDND2020MKT3R3MM	Match
Manufacturer	Taiyo Yuden	Taiyo Yuden	✓
Inductance	3.3 µH	3.3 µH	✓
Inductance Tolerance	±20%	±20%	✓
Current Rating	1.15 A	1.15 A	✓
Saturation Current (Isat)	1.35 A	1.35 A	✓
DC Resistance (DCR) Maximum	178 mOhm	178 mOhm	✓
Shielding	Shielded	Shielded	✓
Core Material	Metal	Metal	✓
Inductor Type	Drum Core, Wirewound	Wirewound	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package Dimensions (L x W x H)	2.00 x 2.00 x 1.20 mm	2.00 x 2.00 x 1.20 mm	✓
Operating Temperature Range	-40 to 125°C	-40 to 125°C	✓
Inductance Test Frequency	1 MHz	1 MHz	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓
Product Status	Not For New Designs	Active	✓ Upgrade

Engineering Selection Recommendations

The LSDND2020MKT3R3MM is the qualified substitute for the MDMK2020T3R3MM. Both components are manufactured by Taiyo Yuden and share identical electrical specifications, mechanical dimensions, and environmental ratings. The key distinction is product status: the MDMK2020T3R3MM carries a "Not For New Designs" designation, while the LSDND2020MKT3R3MM maintains "Active" status.

For new circuit designs, the LSDND2020MKT3R3MM is the appropriate selection. This part ensures long-term supply chain continuity, ongoing manufacturer support, and compliance with current RoHS3 and REACH regulations. Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating equivalent reliability in storage and handling.

The electrical performance is identical across all critical parameters: 3.3 µH inductance at ±20% tolerance, 1.15 A continuous current rating, 1.35 A saturation current, and 178 mOhm maximum DC resistance. The shielded metal core construction and surface mount package configuration are preserved in the substitute part, ensuring direct functional equivalence in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the LSDND2020MKT3R3MM be used as a direct replacement for the MDMK2020T3R3MM in existing designs?

A: Yes. The LSDND2020MKT3R3MM meets all electrical and mechanical specifications of the MDMK2020T3R3MM. Inductance, current rating, DC resistance, shielding, package dimensions, and operating temperature range are identical. No circuit modifications are required.

Q: Why is the MDMK2020T3R3MM marked "Not For New Designs"?

A: This designation indicates that Taiyo Yuden has discontinued active development and support for this product line. The LSDND2020MKT3R3MM represents the current active alternative within the manufacturer's portfolio.

Q: Are there any differences in the core construction between these two parts?

A: The MDMK2020T3R3MM is specified as a drum core wirewound inductor, while the LSDND2020MKT3R3MM is specified as a wirewound inductor. Both use metal core material and deliver identical electrical performance at the specified test frequency of 1 MHz.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the MDMK2020T3R3MM and LSDND2020MKT3R3MM carry MSL 1 (Unlimited) ratings, indicating no moisture sensitivity constraints during storage or handling.

Q: Are the package dimensions identical?

A: Yes. Both parts are packaged in nonstandard 2.00mm x 2.00mm surface mount packages with a maximum seated height of 1.20mm. They are mechanically interchangeable on PCBs designed for either part number.

Q: What is the inductance test frequency for these components?

A: Both parts are tested at 1 MHz, and the inductance value of 3.3 µH is specified at this frequency.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the MDMK2020T3R3MM and LSDND2020MKT3R3MM are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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