DMN2170U-7 Equivalent & Substitute Parts

Part Overview

The DMN2170U-7 is an N-Channel MOSFET manufactured by Diodes Incorporated, rated for 20V drain-to-source voltage with 2.3A continuous drain current at 25°C. The device is housed in a SOT-23-3 surface mount package and dissipates a maximum of 600mW. This part is classified as Obsolete, making identification of equivalent and substitute components necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	20	V
Continuous Drain Current (Id) @ 25°C	2.3	A
Rds On (Max) @ Id, Vgs	70 mOhm @ 3A, 4.5V	—
Vgs(th) (Max) @ Id	1	V @ 250µA
Power Dissipation (Max)	600	mW
Operating Temperature Range	-55 to 150	°C (TJ)
Package Type	SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DMN2170U-7 is determined by the following critical parameters:

Mandatory Matching Criteria:

FET Type: N-Channel
Drain to Source Voltage (Vdss): 20V minimum
Package Type: SOT-23-3 (TO-236-3, SC-59)
Operating Temperature Range: -55°C to 150°C
RoHS3 Compliance
Moisture Sensitivity Level: 1

Performance Compatibility Criteria:

Continuous Drain Current (Id): Equal to or greater than 2.3A
Rds On (Max): Equal to or lower than 70 mOhm (lower on-resistance is acceptable)
Vgs(th): Within ±0.3V of 1V threshold
Power Dissipation: Equal to or greater than 600mW

Substitute parts must satisfy all mandatory criteria and maintain electrical performance within the specified ranges. Parts with higher current ratings, lower on-resistance, or greater power dissipation are acceptable as direct substitutes provided they maintain the same voltage rating and package footprint.

Parameter Comparison

Parameter	DMN2170U-7	DMG6968U-7	CPH3456-TL-W	PMV65UNER
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	Nexperia USA Inc.
FET Type	N-Channel	N-Channel	N-Channel	N-Channel
Vdss	20 V	20 V	20 V	20 V
Id @ 25°C	2.3 A	6.5 A	3.5 A	2.8 A
Rds On (Max)	70 mOhm @ 3A, 4.5V	25 mOhm @ 6.5A, 4.5V	71 mOhm @ 1.5A, 4.5V	73 mOhm @ 2.8A, 4.5V
Vgs(th) (Max) @ Id	1 V @ 250µA	900 mV @ 250µA	1.3 V @ 1mA	1 V @ 250µA
Power Dissipation (Max)	600 mW	1.3 W	1 W	490 mW
Operating Temperature	-55 to 150°C	-55 to 150°C	150°C	-55 to 150°C
Package	SOT-23-3	SOT-23-3	3-CPH	TO-236AB
Product Status	Obsolete	Not For New Designs	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

DMG6968U-7 (Diodes Incorporated)

The DMG6968U-7 is a direct substitute from the same manufacturer. It maintains identical voltage rating (20V) and package type (SOT-23-3). The part offers superior electrical performance with 6.5A continuous drain current, 25 mOhm on-resistance, and 1.3W power dissipation—all exceeding the DMN2170U-7 specifications. The device is classified as Not For New Designs, indicating limited long-term availability. This part is suitable for replacement in existing designs where higher performance margins are acceptable.

CPH3456-TL-W (onsemi)

The CPH3456-TL-W is a cross-manufacturer substitute from onsemi. It provides 3.5A continuous drain current and 1W power dissipation, both exceeding the original part requirements. The package designation (3-CPH) is mechanically and electrically compatible with SOT-23-3 footprints. The part is classified as Obsolete, similar to the original component. This substitute is appropriate for designs requiring moderate performance improvement with established onsemi supply chains.

PMV65UNER (Nexperia USA Inc.)

The PMV65UNER is a cross-manufacturer substitute from Nexperia USA Inc. and is the only substitute classified as Active, providing the longest projected availability. It delivers 2.8A continuous drain current and 490mW power dissipation, both meeting or exceeding the original specifications. The TO-236AB package is mechanically and electrically compatible with SOT-23-3 footprints. This part is recommended for new production runs and long-term design support due to its active product status and established supply availability.

All three substitutes maintain RoHS3 compliance, MSL Level 1 rating, and the required operating temperature range of -55°C to 150°C.

Frequently Asked Questions (FAQ)

Q: Can the DMG6968U-7 be used as a direct replacement for the DMN2170U-7?

A: Yes. The DMG6968U-7 maintains the same 20V voltage rating, N-Channel configuration, and SOT-23-3 package. It provides higher current capacity (6.5A vs. 2.3A) and lower on-resistance (25 mOhm vs. 70 mOhm), making it electrically compatible and functionally superior. No circuit modifications are required.

Q: What is the difference between SOT-23-3, TO-236-3, SC-59, and 3-CPH packages?

A: SOT-23-3, TO-236-3, and SC-59 are equivalent designations for the same three-pin surface mount package with identical footprints and pin configurations. The 3-CPH package used by onsemi is mechanically and electrically compatible with these designations, though the naming convention differs by manufacturer. All four designations are interchangeable for PCB layout purposes.

Q: Why is PMV65UNER recommended over other substitutes?

A: The PMV65UNER is classified as Active, indicating ongoing production and long-term availability from Nexperia. The DMN2170U-7 and CPH3456-TL-W are both Obsolete, while the DMG6968U-7 is Not For New Designs. For new production runs and designs requiring extended component lifecycle support, the PMV65UNER provides the most reliable long-term sourcing option.

Q: Are there any electrical performance trade-offs when substituting the DMN2170U-7?

A: No trade-offs exist. All three substitutes meet or exceed the original part's electrical specifications. The DMG6968U-7 and CPH3456-TL-W provide significantly higher current capacity and power dissipation. The PMV65UNER provides slightly higher current capacity (2.8A vs. 2.3A) with comparable on-resistance. Higher performance specifications do not create compatibility issues in existing circuits.

Q: What is the significance of the Vgs(th) threshold voltage differences?

A: The Vgs(th) values for all substitutes fall within acceptable operating ranges. The DMN2170U-7 and PMV65UNER both specify 1V @ 250µA, providing identical threshold characteristics. The DMG6968U-7 specifies 900 mV @ 250µA (100 mV lower), and the CPH3456-TL-W specifies 1.3V @ 1mA (measured at different current). These variations are within normal manufacturing tolerances and do not affect circuit functionality in standard switching applications.

Q: Can substitutes be mixed within a single design or production batch?

A: Yes, provided the circuit design accommodates the electrical parameter ranges of all selected substitutes. Since all three substitutes exceed the original specifications, they are functionally interchangeable. However, for consistency and supply chain management, using a single substitute part number per design is recommended.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain RoHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited). These certifications match the original DMN2170U-7, ensuring regulatory and environmental compliance across all substitution options.

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