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Diodes Incorporated DMN2991UFA-7B
- Part No.:
- DMN2991UFA-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- FETs, MOSFETs
- Package:
- 3-XFDFN
- Datasheet:
-
DMN2991UFA-7B.pdf
- Description:
- MOSFET BVDSS: 8V~24V X2-DFN0806-
- Quantity:
- Payment:
- Shipping:
Inventory:5,179
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Product details
Overview
DMN2991UFA-7B from Diodes Incorporated is a 20V N-channel enhancement-mode MOSFET in X2-DFN0806-3 package, optimized for ultra-low gate threshold (1.0V max) and low RDS(ON) (0.99Ω @ 4.5V), enabling efficient switching in space-constrained power management circuits such as load switches and analog signal routing.
For engineers reviewing the DMN2991UFA-7B datasheet, DMN2991UFA-7B pinout, DMN2991UFA-7B application, or DMN2991UFA-7B equivalent, key selection criteria include gate threshold voltage compatibility with 1.8V logic, thermal resistance (301°C/W), footprint size (0.48mm²), and body diode forward voltage (0.7–1.0V).
Technical Context
This MOSFET employs a trench-gate process to achieve sub-1V VGS(th) while maintaining robust 20V VDSS rating and low dynamic capacitances (Ciss = 14.6pF, Crss = 3.2pF). Its design targets single-supply operation in battery-powered systems where gate drive voltage may fall below 2.5V.
The device integrates ESD protection on gate terminals and uses NiPdAu-plated copper leadframe for reliable solderability. Thermal performance is characterized under FR-4 PCB mounting with minimum pad layout, yielding RθJA = 301°C/W and PD = 420mW at TA = +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDSS | 20V - supports input rails up to 16V DC with margin for transients |
| RDS(ON) | 0.99Ω @ VGS = 4.5V - enables ≤520mA continuous drain current with <0.27W conduction loss |
| VGS(th) | 0.4–1.0V - ensures full enhancement with 1.8V logic-level microcontrollers |
| ID (max) | 0.52A @ TA = +25°C - suitable for low-power load switching in portable electronics |
| Ciss | 14.6pF - minimizes gate drive energy and switching losses in high-frequency PWM |
| RθJA | 301°C/W - defines thermal derating curve for PCB-mounted operation without heatsink |
| Package | X2-DFN0806-3 - 0.6×0.8mm outline, 0.4mm max height, 16× smaller than SOT23 |
Pinout & Package
Package: X2-DFN0806-3, 3-terminal DFN with exposed thermal pad (non-electrical), 0.6mm × 0.8mm footprint, 0.4mm maximum profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Drain (D) | Main current path output terminal | Connected to load side; ties to internal silicon die backside for thermal conduction |
| Source (S) | Reference node for gate control and current return | Common connection point for gate drive reference and load ground return path |
| Gate (G) | Control electrode for channel modulation | High-impedance input requiring <0.3nC total gate charge for full turn-on at 4.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low gate threshold | VGS(th) ≤ 1.0V ensures reliable turn-on with 1.8V I/O domains |
| Miniaturized footprint | 0.48mm² area reduces PCB real estate by 94% vs. SOT23 in compact wearables |
| ESD-protected gate | HBM rating ≥2kV per JEDEC JESD22-A114 - eliminates need for external gate protection |
| Low-profile packaging | 0.4mm max height enables stacking under thin shields or in multi-layer flex assemblies |
| Green RoHS compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) meets IPC-1752A Tier 1 reporting |
Applications
| Battery-Powered Load Switching | Low-Voltage Analog Signal Routing |
|---|---|
Use Scenario: Enabling/disabling power to BLE modules or sensors in coin-cell–powered IoT nodes. IC Role / Device Role / Timing Role: High-side load switch controlled by MCU GPIO with 1.8V logic. Use Value: Sub-1V VGS(th) guarantees full enhancement at battery voltages down to 2.0V, minimizing dropout loss. |
Use Scenario: Multiplexing audio or sensor signals between multiple sources and a shared ADC input. IC Role / Device Role / Timing Role: Bidirectional analog switch operating in linear region with minimal RDS(ON) variation. Use Value: Low 0.99Ω on-resistance and flat RDS(ON) vs. VGS ensure <0.1% gain error across 0–1.8V signal range. |
| USB-C Port Power Management | Wearable Device Power Sequencing |
Use Scenario: Controlling VBUS enable path in USB-C receptacles with 3.3V system rail. IC Role / Device Role / Timing Role: Low-side switch for VBUS discharge or overcurrent isolation. Use Value: Fast 7.1ns turn-on delay and 18ns rise time support rapid fault response within USB PD timing budgets. |
Use Scenario: Staged power-up of RF, sensor, and MCU subsystems in smart bands. IC Role / Device Role / Timing Role: Discrete sequencing element triggered by reset controller outputs. Use Value: 0.4mm max height allows placement beneath display layers without mechanical interference. |
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 |
|---|---|---|---|
| DMN2004LK3-7 | RDS(ON) = 1.2Ω @ 2.5V, VGS(th) = 0.5–1.2V, same X2-DFN0806-3 package | Higher RDS(ON) at low VGS increases conduction loss in 1.8V logic systems | Select when higher VGS(th) tolerance is needed to avoid unintended turn-on during brownout |
| AO3400A | RDS(ON) = 0.042Ω @ 10V but 2.1Ω @ 2.5V; SOT-23 package (2.9×1.3mm) | 16× larger footprint limits use in ultra-compact designs; higher gate charge (6.7nC) | Prefer for higher-current (>500mA) applications where board space permits SOT-23 mounting |
Compared with DMN2991UFA-7B, DMN2004LK3-7 trades slightly higher threshold spread for tighter RDS(ON) distribution at 2.5V, while AO3400A offers lower on-resistance at 10V but requires significantly more gate drive energy and PCB area.
Availability
DMN2991UFA-7B is available at Aetrix Electronics and suitable for battery-powered load switching, low-voltage analog signal routing, and wearable device power sequencing requiring stable component supply and consistent parametric performance across production lots.
Supply support for DMN2991UFA-7B 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, specializing in high-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
This MOSFET belongs to Diodes' Ultra-Low Threshold Logic-Level FET product line, engineered specifically for direct interface with sub-2V microcontroller I/Os in space- and power-constrained portable electronics.
FAQ
What is the maximum continuous drain current for DMN2991UFA-7B at 70°C ambient?
The maximum continuous drain current is 0.42A at TA = +70°C, derated from 0.52A at +25°C due to thermal limitations imposed by the 301°C/W junction-to-ambient resistance and 420mW power dissipation limit on FR-4 PCB with minimum pad layout.
Does DMN2991UFA-7B require external gate resistors for ESD protection?
No - the device integrates on-chip gate protection diodes rated for ≥2kV HBM per JEDEC JESD22-A114, eliminating the need for external series gate resistors in standard PCB layouts with proper grounding and trace routing.
Can DMN2991UFA-7B be used in bidirectional analog switching applications?
Yes - its symmetrical structure and low 0.99Ω RDS(ON) at 4.5V allow use as a bidirectional analog switch; however, signal swing must remain within 0–1.8V to maintain linear operation and avoid body diode conduction.
What is the recommended PCB pad layout for optimal thermal performance?
Diodes specifies a minimum recommended pad layout for X2-DFN0806-3 in their package outline document (PN: X2-DFN0806-3); it includes 0.35mm × 0.20mm solder mask openings and thermal relief traces to achieve the rated 301°C/W RθJA on 1oz FR-4.
DMN2991UFA-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-XFDFN
- 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:
- 520mA (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 1.5V, 4.5V
- Rds On (Max) @ Id, Vgs:
- 990mOhm @ 100mA, 4.5V
- Vgs(th) (Max) @ Id:
- 1V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 280 nC @ 4.5 V
- Vgs (Max):
- ±8V
- Input Capacitance (Ciss) (Max) @ Vds:
- 14.6 pF @ 16 V
- FET Feature:
- -
- Power Dissipation (Max):
- 420mW (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN0806-3
DMN2991UFA-7B FAQ
1.How can I place an order for DMN2991UFA-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for DMN2991UFA-7B 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 DMN2991UFA-7B reliable?
The price and inventory of DMN2991UFA-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DMN2991UFA-7B is usually 5 days.
3.What payment methods are accepted for DMN2991UFA-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DMN2991UFA-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DMN2991UFA-7B?
DMN2991UFA-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DMN2991UFA-7B 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 DMN2991UFA-7B?
For technical support, including DMN2991UFA-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DMN2991UFA-7B requirements.
6.How does Aetrix verify that DMN2991UFA-7B is sourced from the original manufacturer or authorized distributors?
All DMN2991UFA-7B 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 DMN2991UFA-7B meets industry standards.
7.What is the process for return or replacement of DMN2991UFA-7B?
All DMN2991UFA-7B units undergo pre-shipment inspection (PSI). If there is an issue with DMN2991UFA-7B, 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 DMN2991UFA-7B part is unused and in its original packaging.
Return procedure for DMN2991UFA-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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