Equivalent & Substitute Parts for DMN3112S-7

Part Overview

The DMN3112S-7 is an N-Channel 30V 5.8A MOSFET manufactured by Diodes Incorporated in SOT-23-3 surface mount packaging. This device is classified as obsolete product status, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. The part delivers 1.4W power dissipation at ambient temperature with a maximum drain-source voltage of 30V and continuous drain current of 5.8A at 25°C.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
Drain to Source Voltage (Vdss)	30	V
Current - Continuous Drain (Id) @ 25°C	5.8	A
Rds On (Max) @ Id, Vgs	57	mOhm @ 5.8A, 10V
Vgs(th) (Max) @ Id	2.2	V @ 250µA
Vgs (Max)	±20	V
Input Capacitance (Ciss) (Max) @ Vds	268	pF @ 5V
Power Dissipation (Max)	1.4	W (Ta)
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DMN3112S-7 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain to Source Voltage (Vdss): 30V minimum
Continuous Drain Current (Id): 5.8A or greater at 25°C
Package Type: SOT-23-3 surface mount (TO-236-3, SC-59 equivalent)
Operating Temperature Range: -55°C to 150°C minimum
RoHS3 Compliance and MSL Level 1

Secondary Compatibility Parameters:

Rds On (Max) @ 10V: 57mOhm or lower for equivalent performance
Vgs(th) (Max): 2.2V to 3V range for gate drive compatibility
Vgs (Max): ±20V or ±12V acceptable
Power Dissipation: 1.4W or greater at ambient temperature

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (5.8A Current Rating): Parts matching or exceeding the 5.8A continuous drain current specification with comparable Rds On characteristics.

Category B - Functional Alternatives (3.4A to 4.4A Current Rating): Parts with reduced current ratings but compatible voltage, package, and thermal specifications suitable for applications with lower current demands.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Vgs Max (V)	Ciss (pF)	Pd (W)	Temp Range (°C)	Package	Status
DMN3112S-7	Diodes Inc.	30	5.8	57 @ 5.8A, 10V	2.2 @ 250µA	±20	268 @ 5V	1.4	-55 to 150	SOT-23-3	Obsolete
AO3404A	UMW	30	5.8	25 @ 5.8A, 10V	3 @ 250µA	±20	820 @ 15V	1.4	-55 to 150	SOT-23-3	Active
DMN3110S-7	Diodes Inc.	30	2.5	73 @ 3.1mA, 10V	3 @ 250µA	±20	305.8 @ 15V	0.74	-55 to 150	SOT-23-3	Active
AO3402	Alpha & Omega	30	4	55 @ 4A, 10V	1.4 @ 250µA	±12	390 @ 15V	1.4	-55 to 150	SOT-23-3	Not For New Designs
AO3406	Alpha & Omega	30	3.6	50 @ 3.6A, 10V	2.5 @ 250µA	±20	210 @ 15V	1.4	-55 to 150	SOT-23-3	Not For New Designs
AO3418	Alpha & Omega	30	3.8	60 @ 3.8A, 10V	1.8 @ 250µA	±12	270 @ 15V	1.4	-55 to 150	SOT-23-3	Not For New Designs
AO3424	Alpha & Omega	30	3.8	80 @ 2A, 10V	1.8 @ 250µA	±12	270 @ 15V	1.4	-55 to 150	SOT-23-3	Not For New Designs
IRLML6346TRPBF	Infineon	30	3.4	63 @ 3.4A, 4.5V	1.1 @ 10µA	±12	270 @ 24V	1.3	-55 to 150	SOT-23-3	Active
NTR4170NT1G	onsemi	30	2.4	55 @ 3.2A, 10V	1.4 @ 250µA	±12	432 @ 15V	0.48	-55 to 150	SOT-23-3	Active
PMV28ENEAR	Nexperia	30	4.4	37 @ 4.4A, 10V	2.5 @ 250µA	±20	266 @ 15V	0.66 (Ta), 8.3 (Tc)	-55 to 175	TO-236AB	Active
PMV50ENEAR	Nexperia	30	3.9	43 @ 3.9A, 10V	2.5 @ 250µA	±20	276 @ 15V	0.51 (Ta), 3.9 (Tc)	-55 to 150	TO-236AB	Not For New Designs

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

The AO3404A (UMW) is the primary substitute for the DMN3112S-7. This part matches the critical specifications: 30V Vdss, 5.8A continuous drain current at 25°C, 1.4W power dissipation, SOT-23-3 package, and -55°C to 150°C operating temperature range. The AO3404A is currently in active product status with 450,100 pieces in stock. The device exhibits superior Rds On performance (25mOhm versus 57mOhm) and maintains ±20V gate voltage rating compatibility with the original part.

Secondary Recommendations - Functional Alternatives:

For applications where the full 5.8A current capability is not required:

PMV28ENEAR (Nexperia): Provides 4.4A continuous drain current with active product status and automotive-grade qualification (AEC-Q101). Operating temperature extends to 175°C. Rds On of 37mOhm at 4.4A, 10V offers improved performance. TO-236AB package is mechanically compatible with SOT-23-3 footprints.
IRLML6346TRPBF (Infineon): Delivers 3.4A continuous drain current with active product status. HEXFET® series technology provides 63mOhm Rds On at 3.4A, 4.5V. Suitable for lower-current applications within the same voltage and temperature envelope.
AO3406 (Alpha & Omega): Offers 3.6A continuous drain current with 50mOhm Rds On at 3.6A, 10V. Maintains ±20V gate voltage rating and SOT-23-3 package compatibility. Product status is "Not For New Designs."

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with existing supply chain and assembly processes. Automotive-qualified options (PMV28ENEAR, PMV50ENEAR) carry AEC-Q101 certification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can the AO3404A directly replace the DMN3112S-7 in existing designs?

A: Yes. The AO3404A matches all critical electrical parameters: 30V Vdss, 5.8A Id @ 25°C, 1.4W power dissipation, and SOT-23-3 package. The improved Rds On (25mOhm versus 57mOhm) reduces on-state losses. Gate voltage rating (±20V) and operating temperature range (-55°C to 150°C) are identical. Active product status ensures long-term availability.

Q: What is the difference between SOT-23-3 and TO-236AB packages?

A: SOT-23-3 and TO-236AB are mechanically equivalent surface mount packages with identical pin configurations and footprints. Both designations refer to the same 3-lead small-outline transistor package. Parts specified as TO-236AB are functionally interchangeable with SOT-23-3 in PCB layouts.

Q: Why do some substitute parts have lower current ratings than the DMN3112S-7?

A: Lower current-rated substitutes (3.4A to 4.4A) are offered for applications where the full 5.8A capability is not required. These alternatives provide active product status, improved availability, and in some cases, superior Rds On performance or extended temperature ranges. Selection depends on actual circuit current requirements.

Q: Are the Nexperia PMV28ENEAR and PMV50ENEAR suitable for automotive applications?

A: Yes. Both PMV28ENEAR and PMV50ENEAR carry AEC-Q101 automotive qualification and are designated as automotive-grade components. Operating temperature extends to 175°C for PMV28ENEAR. These parts are appropriate for automotive and industrial applications requiring qualified component status.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates the manufacturer is not recommending the part for new circuit designs, though existing inventory remains available. These parts may have limited long-term support or planned discontinuation. For new designs, prioritize parts with "Active" product status such as AO3404A, IRLML6346TRPBF, NTR4170NT1G, or PMV28ENEAR.

Q: How does Rds On affect circuit performance?

A: Rds On (on-state drain-source resistance) directly impacts power dissipation and heat generation. Lower Rds On values reduce I²R losses during conduction. The AO3404A (25mOhm) dissipates less heat than the original DMN3112S-7 (57mOhm) at equivalent current levels, improving thermal performance and potentially allowing higher current operation within the same power budget.

Q: Can I use a lower-current substitute if my circuit only draws 3A?

A: Yes, provided the substitute part meets or exceeds your actual circuit current requirement. For 3A operation, parts such as AO3406 (3.6A), AO3418 (3.8A), IRLML6346TRPBF (3.4A), or NTR4170NT1G (2.4A) are suitable. Verify that the selected part's Rds On and power dissipation specifications remain within acceptable limits for your thermal design.

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

A: Vgs(th) determines the minimum gate-source voltage required to turn the MOSFET on. The DMN3112S-7 specifies 2.2V @ 250µA. Substitutes range from 1.1V to 3V. Lower threshold voltages enable operation with lower gate drive voltages, while higher thresholds may require stronger gate drivers. Verify gate drive circuit compatibility with the selected substitute's Vgs(th) specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, ensuring compatibility with RoHS3 regulatory requirements and existing procurement specifications. MSL Level 1 (Unlimited) moisture sensitivity is maintained across all alternatives.

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