DN2540N5 Microchip MOSFET (N-Channel) (Transistor Outline, Vertical) In Stock
The DN2540N5 is a Microchip N-channel depletion-mode MOSFET rated at 400 V and 25 Ω RDS(on), housed in a TO-92 vertical package for use as a constant-current source, high-voltage switch, or linear regulator in power and analog circuits.
- Manufacturer
- Microchip
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- DN2540N5 Datasheet PDF
- Category
- MOSFET (N-Channel)
- Price
- From $9.4290(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Depletion-mode N-channel MOSFET with 400 V drain-source voltage rating for high-voltage switching and current source applications
- 25 Ω RDS(on) enabling self-biased constant-current source operation without external gate-bias resistors
- TO-92 vertical through-hole package for straightforward PCB integration in linear power stages and high-voltage analog designs
Applications
The DN2540N5 is commonly used as a self-biased constant-current source in LED drivers, high-voltage linear regulators, and analog signal conditioning circuits where its depletion-mode characteristic allows the gate to be shorted to the source for stable current-setting operation. It is also suitable as a high-voltage switch in flyback converter gate drive auxiliary circuits and bootstrapping applications. The 400 V rating makes it appropriate for mains-connected and industrial 48 V bus power designs.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for DN2540N5:
Frequently Asked Questions
What makes the DN2540N5 a depletion-mode MOSFET, and how does this differ from enhancement-mode devices in circuit design?
The DN2540N5 is a depletion-mode N-channel MOSFET, meaning it conducts drain current at zero gate-to-source voltage (VGS = 0 V) and turns off when VGS is made sufficiently negative. Unlike enhancement-mode MOSFETs that require a positive VGS to turn on, the DN2540N5 can be self-biased by shorting gate to source, enabling simple constant-current source circuits across its 400 V operating range without external gate drive.
What is the drain-source breakdown voltage of the DN2540N5, and what high-voltage applications benefit from this rating?
The DN2540N5 is rated at 400 V drain-source breakdown voltage, making it suitable for mains-derived power supplies, PFC pre-regulators, and 48 V to 400 V DC-DC converter auxiliary circuits. At 400 V, it can handle the peak voltages seen in offline AC-DC applications where the rectified mains voltage reaches approximately 370 V under 240 VAC input conditions, providing an adequate safety margin.
How does the 25 Ω RDS(on) of the DN2540N5 affect its suitability for constant-current source designs versus low-RDS switching applications?
The DN2540N5's 25 Ω RDS(on) is relatively high compared to power switching MOSFETs, which makes it unsuitable for high-current switching applications where conduction losses dominate. However, in constant-current source configurations—such as biasing circuits delivering 5 mA to 20 mA—the 25 Ω on-resistance introduces only millivolt-level drops at those currents, making the device highly practical for precision analog biasing and low-current LED driving at up to 400 V.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $12.8577 | $12.86 |
| 2+ | $10.7148 | $21.43 |
| 3+ | $9.4290 | $28.29 |
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