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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Diodes Incorporated DMN2991UT-7

Name: DMN2991UT-7
Brand: Diodes Incorporated
SKU: DMN2991UT-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DMN2991UT-7

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

Package:: SOT-523

Datasheet:: DMN2991UT-7.pdf

Description:: MOSFET BVDSS: 8V~24V SOT523 T&R

Quantity:: RFQ Add To RFQ list

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Product details

Overview

DMN2991UT-7 from Diodes Incorporated is an N-channel enhancement-mode MOSFET in SOT523 package, rated for 20V V_DSS, 0.3A continuous drain current at 25°C, and ultra-low gate threshold voltage (≤1.0V), enabling direct drive from 1.8V logic. It delivers R_DS(ON) = 3Ω @ V_GS = 4.5V and 6Ω @ V_GS = 1.8V, targeting space-constrained load switching in portable power management.

For engineers reviewing the DMN2991UT-7 datasheet, DMN2991UT-7 pinout, DMN2991UT-7 application, or DMN2991UT-7 equivalent, key selection criteria include low-voltage gate compatibility, sub-1V turn-on behavior, thermal performance on FR-4 with minimal copper, and SOT523 footprint constraints in high-density DC-DC converter layouts.

Technical Context

This MOSFET employs a planar trench-enhanced silicon process optimized for low V_GS(TH) and minimized input capacitance (C_iss = 21.5pF), supporting fast switching (t_D(ON) = 5.6ns) without compromising leakage (I_DSS ≤ 1μA @ 16V). Its body diode exhibits V_SD = 0.8–1.0V @ 150mA, suitable for synchronous rectification in low-duty-cycle topologies.

The device operates across –55°C to +150°C junction temperature, with normalized R_DS(ON) variation ≤1.6× over that range at V_GS = 4.5V. Thermal resistance is 439°C/W (steady-state, minimal pad) and 291°C/W (2oz copper bias), confirming its suitability for thermally isolated, low-power load switch nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	20V - Maximum blocking voltage before avalanche; sets upper limit for input rail in 3.3V/5V systems.
R_DS(ON) @ V_GS = 1.8V	6Ω - Enables functional switching from 1.8V GPIOs; yields ~120mW conduction loss at 20mA.
V_GS(TH) Max	1.0V - Guarantees reliable turn-on with 1.2V logic families; eliminates need for level-shifting circuitry.
C_iss	21.5pF - Low gate charge (Q_g = 0.35nC) reduces driver power and EMI during 10MHz-class switching.
P_D (2oz copper)	0.43W - Supports 240mA continuous operation at 25°C ambient with thermal bias; defines safe load current ceiling.
Package	SOT523 - 1.6 × 1.6 × 0.6mm footprint; requires precise stencil design and reflow profile for void-free solder joints.

Pinout & Package

SOT523 is a 3-terminal ultra-small surface-mount plastic package with matte tin–annealed terminals on Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Control terminal; accepts 0–10V signals; ESD-protected (HBM >2kV); drives with <0.35nC total charge.
S	Source	Reference node for gate drive; connects to system ground or low-side return path; carries full load current.
D	Drain	High-side output terminal; connects to supply rail or switched load; withstands 20V transient spikes.

Key Features

Feature	Design Value
Ultra-low gate threshold	V_GS(TH) ≤ 1.0V ensures robust turn-on from 1.8V microcontrollers without external biasing.
Low R_DS(ON) at low V_GS	6Ω @ 1.8V enables <100mW dissipation in 200mA load switches-critical for battery-powered wearables.
ESD-protected gate	HBM rating >2kV allows safe handling and board-level assembly without special ESD controls.
Green, halogen-free construction	Meets IEC 61249-2-21; Br+Cl <1500ppm, Sb <1000ppm-compliant with automotive and medical RoHS requirements.

Applications

Battery-Powered Load Switch

Low-Voltage DC-DC Enable Control

Use Scenario: Power gating of BLE radio modules in coin-cell–powered IoT sensors during sleep mode.

IC Role / Device Role / Timing Role: High-side load switch controlled by MCU GPIO; toggled at 1Hz–10Hz duty cycle.

Use Value: 6Ω R_DS(ON) at 1.8V drive limits leakage to <1μA off-state and drop to <120mV at 20mA, extending battery life >30%.

Use Scenario: Enabling/disabling buck converter output stage in USB-C PD sink applications with 3.3V logic control.

IC Role / Device Role / Timing Role: Logic-level interface between controller and power stage; responds within 10ns to enable/disable commands.

Use Value: Fast t_D(ON)/t_F (5.6ns/27.6ns) prevents shoot-through during sequencing; low C_iss minimizes controller loading.

USB Port Power Management

Wearable Sensor Power Domain Isolation

Use Scenario: Overcurrent-protected VBUS switching in portable USB hubs with 5V input and 1.8V/3.3V logic supervision.

IC Role / Device Role / Timing Role: Low-side current-sense switch; placed between VBUS and downstream port; driven by dedicated USB controller.

Use Value: 0.3A rating and 3Ω R_DS(ON) @ 4.5V support 1.5W delivery per port; low I_DSS (<1μA) prevents standby drain.

Use Scenario: Isolating ECG front-end analog domain from digital processor during measurement cycles in patch-style monitors.

IC Role / Device Role / Timing Role: Precision power gate; activated synchronously with ADC sampling window to minimize noise coupling.

Use Value: Sub-1V V_GS(TH) ensures clean turn-on timing with 1.2V reference clocks; 0.002g mass avoids mechanical stress on flexible PCBs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2004LK-7	V_DSS = 20V, R_DS(ON) = 2.5Ω @ 4.5V but V_GS(TH) = 1.2V max; SOT-323 package (larger, 2.1× footprint).	Higher gate threshold requires ≥2.5V logic; unsuitable for 1.8V-only systems; better thermal derating due to larger pad area.	Select when board layout permits SOT-323 and gate drive voltage exceeds 2.5V; avoid for 1.8V GPIO interfaces.
AO3414	V_DSS = 20V, R_DS(ON) = 5.5Ω @ 2.5V but V_GS(TH) = 0.7–1.4V (wider spread); SOT-23 package (3.0× larger than SOT523).	Statistical V_GS(TH) variation increases risk of incomplete turn-on at 1.8V; larger size impedes ultra-dense wearable layouts.	Acceptable only with 2.5V+ gate drive and where SOT-23 placement is feasible; not recommended for 1.8V deterministic switching.

Compared with DMN2991UT-7, DMN2004LK-7 offers lower R_DS(ON) but fails at 1.8V drive, while AO3414 introduces parametric uncertainty in threshold voltage-making DMN2991UT-7 uniquely suited for guaranteed 1.8V-compatible, space-constrained load switching.

Availability

DMN2991UT-7 is available at Aetrix Electronics and suitable for battery-powered load switching, low-voltage DC-DC enable control, and USB port power management requiring stable component supply, consistent SOT523 sourcing, and RoHS-compliant green packaging.

Supply support for DMN2991UT-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and distribution operations across Asia, Europe, and North America.

The DMN2991UT-7 belongs to Diodes' "Logic-Level MOSFET" product line, engineered specifically for direct interfacing with low-voltage digital logic in portable and energy-sensitive applications.

FAQ

What is the maximum continuous drain current for DMN2991UT-7 at 75°C ambient?

The datasheet specifies 0.24A continuous drain current at T_A = +75°C with standard FR-4 mounting (2oz copper bias not applied). This derating reflects junction-to-ambient thermal resistance of 439°C/W and 150°C maximum junction temperature. Operation above this current requires thermal modeling or enhanced PCB copper.

Can DMN2991UT-7 be used in reverse conduction (source-to-drain) mode?

Yes-the integrated body diode supports forward conduction from source to drain with V_SD = 0.8–1.0V at 150mA and T_J = 25°C. However, reverse recovery is not characterized, and it is not rated for repetitive reverse recovery stress; use only in unidirectional, non-switching freewheeling roles.

Is DMN2991UT-7 qualified for automotive applications under AEC-Q101?

No-DMN2991UT-7 is not AEC-Q101 qualified. The datasheet explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for commercial and industrial applications only.

What is the gate charge required to fully switch DMN2991UT-7 at 4.5V?

Total gate charge Q_g is 0.35nC at V_GS = 4.5V, V_DS = 10V, and I_D = 250mA. This value includes both gate-source (Q_gs = 0.07nC) and gate-drain (Q_gd = 0.08nC) components, defining minimum driver current needed for nanosecond-scale transitions.

DMN2991UT-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-523

Packaging:: Tape & Reel (TR)

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 20 V

Current - Continuous Drain (Id) @ 25°C:: 300mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 1.5V, 4.5V

Rds On (Max) @ Id, Vgs:: 3Ohm @ 100mA, 4.5V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 0.35 nC @ 4.5 V

Vgs (Max):: ±10V

Input Capacitance (Ciss) (Max) @ Vds:: 21.5 pF @ 15 V

FET Feature:: -

Power Dissipation (Max):: 280mW (Ta)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-523

DMN2991UT-7 FAQ

1.How can I place an order for DMN2991UT-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DMN2991UT-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DMN2991UT-7 reliable?

The price and inventory of DMN2991UT-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DMN2991UT-7 is usually 5 days.

3.What payment methods are accepted for DMN2991UT-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DMN2991UT-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DMN2991UT-7?

DMN2991UT-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DMN2991UT-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DMN2991UT-7?

For technical support, including DMN2991UT-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DMN2991UT-7 requirements.

6.How does Aetrix verify that DMN2991UT-7 is sourced from the original manufacturer or authorized distributors?

All DMN2991UT-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DMN2991UT-7 meets industry standards.

7.What is the process for return or replacement of DMN2991UT-7?

All DMN2991UT-7 units undergo pre-shipment inspection (PSI). If there is an issue with DMN2991UT-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DMN2991UT-7 part is unused and in its original packaging.

Return procedure for DMN2991UT-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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