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

Diodes Incorporated BSS126SK-7

Name: BSS126SK-7
Brand: Diodes Incorporated
SKU: BSS126SK-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS126SK-7

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BSS126SK-7.pdf

Description:: DIODE GP SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:7,180

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Product details

Overview

BSS126SK-7 from Diodes Incorporated is an N-channel depletion-mode MOSFET in SOT23 package, rated for 600V drain-source breakdown voltage, 700Ω maximum R_DS(ON) at V_GS = 0V, and 7mA minimum I_DSS. It operates as a normally-on high-voltage level shifter or small-signal switch in DC-DC converters and backlighting circuits.

For engineers reviewing the BSS126SK-7 datasheet, BSS126SK-7 pinout, BSS126SK-7 application, or BSS126SK-7 equivalent, key selection criteria include depletion-mode operation, 600V blocking capability, low gate charge (2nC), ESD protection, and SOT23 thermal performance under pulsed and steady-state conditions.

Technical Context

This device uses planar silicon technology to achieve stable depletion-mode behavior with a gate threshold voltage of −2.7V to −1.4V and intrinsic body diode conduction. Its 600V V_DSS and 0.09A pulsed drain current support high-side switching in flyback and resonant topologies.

The MOSFET exhibits low input capacitance (30.9pF) and reverse transfer capacitance (0.8pF), enabling fast turn-on (5.2ns delay) and controlled switching transitions. Thermal resistance of 124.7°C/W (FR-4 PCB) ensures reliable operation up to +150°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	600V - supports primary-side switching in offline AC/DC converters without external clamping
R_DS(ON) @ V_GS = 0V	700Ω max - defines on-resistance in depletion mode for biasing and level-shift applications
I_DSS	7mA min @ V_GS = 0V, V_DS = 25V - sets baseline current for gate-controlled current source behavior
Q_g	2nC - enables low-power gate driving with minimal switching loss in low-duty-cycle control
V_GS(TH)	−2.2V typ @ V_DS = 3V, I_D = 8µA - determines gate voltage required to fully pinch-off channel
t_F	873ns - fall time under 300V V_DD, 0.01A load, and 6Ω gate resistor; critical for EMI control
R_θJA	124.7°C/W - thermal limit for single-sided FR-4 layout; constrains continuous power to ~1W at +25°C ambient

Pinout & Package

Package: SOT23 - surface-mount plastic case, 0.008g weight, UL 94V-0 rated molding compound, matte tin annealed terminals.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for depletion-mode conduction	Connected to ground or low-side reference; body diode anode for reverse recovery analysis
2 (Gate)	Control electrode for channel depletion	Negative V_GS reduces I_D; zero bias sustains 7mA; ±20V absolute max rating
3 (Drain)	High-voltage output terminal	Handles 600V blocking; connects to transformer primary or LED string anode in boost configurations

Key Features

Feature	Design Value
Depletion-mode operation	Enables "always-on" startup behavior without external bias; simplifies gate drive in level-shift circuits
ESD protection	HBM >2kV - prevents gate oxide damage during board handling and reflow assembly
Lead-free & RoHS compliant	Fully compliant with EU Directive 2015/863/EU; <900ppm Br+Cl, <1000ppm Sb - meets automotive green material specs
Low C_iss/C_rss ratio	30.9pF / 0.8pF - improves Miller immunity and reduces gate oscillation risk in high-dV/dt environments
150°C max junction temperature	Supports operation in sealed enclosures or high-ambient industrial lighting systems without derating

Applications

Motor Control

Backlighting

Use Scenario: Low-power stepper motor phase enable/disable in HVAC actuators.

IC Role / Device Role / Timing Role: High-side depletion-mode switch controlling 24V coil current with no gate bias supply.

Use Value: Eliminates need for charge pump or isolated gate driver; leverages I_DSS = 7mA to sustain hold current during microcontroller sleep.

Use Scenario: CCFL or LED string anode switching in industrial panel displays.

IC Role / Device Role / Timing Role: Fast-turn-off high-voltage switch in boost converter secondary side.

Use Value: 873ns fall time and 600V rating allow direct interface with 400V bus without snubber network.

DC-DC Converters

Power Management Functions

Use Scenario: Auxiliary bias winding regulation in offline flyback PSUs.

IC Role / Device Role / Timing Role: Depletion-mode sense FET providing self-bias to optocoupler feedback circuit.

Use Value: Zero-V_GS conduction delivers stable 7mA reference current across line and load variations.

Use Scenario: Standby power sequencer in multi-rail embedded systems.

IC Role / Device Role / Timing Role: Normally-on switch enabling 3.3V rail before main controller boots.

Use Value: −2.2V V_GS(TH) allows clean turn-off using standard GPIO; avoids external pull-down resistors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar depletion-mode MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2004LK-7	40V V_DSS, 2.5Ω R_DS(ON), enhancement-mode - requires active gate drive	Not suitable for 600V or zero-bias applications; limited to low-voltage logic-level switching	Select only if system uses dedicated gate bias and operates below 40V; not a functional replacement
IXTP01N60P	600V V_DSS, 100Ω R_DS(ON), enhancement-mode - needs −10V gate drive for full turn-off	Higher conduction loss and complex gate control; lacks depletion-mode simplicity for bias networks	Prefer when higher I_D (>100mA) is needed; avoid where zero-V_GS operation is mandatory

Compared with DMN2004LK-7 and IXTP01N60P, BSS126SK-7 uniquely provides verified 600V depletion-mode operation with 7mA I_DSS and 700Ω R_DS(ON), enabling self-biased, gateless switching in space-constrained high-voltage signal paths.

Availability

BSS126SK-7 is available at Aetrix Electronics and suitable for motor control, backlighting, and DC-DC converter designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SOT23 packaging.

Supply support for BSS126SK-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 sales operations across Asia, Europe, and the Americas.

The BSS126SK-7 belongs to Diodes' high-voltage depletion-mode MOSFET product line, engineered specifically for level-shifting, bias generation, and normally-on switching in compact power management subsystems.

FAQ

Is BSS126SK-7 a depletion-mode or enhancement-mode MOSFET?

BSS126SK-7 is a confirmed N-channel depletion-mode MOSFET. It conducts 7mA minimum drain current at V_GS = 0V and requires negative gate voltage (down to −2.7V) to fully pinch off the channel. This behavior is explicitly defined in its Electrical Characteristics table and Transfer Characteristic curves (Figure 2).

What is the maximum continuous drain current at +70°C ambient?

At T_A = +70°C, the continuous drain current is 24mA (Note 5) or 28mA (Note 6), depending on PCB layout. Note 6 specifies 1" × 1" FR-4 with 2 oz. copper, yielding 28mA - a value validated by thermal resistance (R_θJA = 95.5°C/W) and 1.3W power dissipation rating.

Can BSS126SK-7 replace a JFET in high-voltage bias circuits?

Yes - BSS126SK-7 is functionally compatible with high-voltage N-channel JFETs (e.g., 2N5457) in bias networks due to matching depletion-mode operation, 600V V_DSS, and sub-mA I_DSS. Its lower C_iss (30.9pF vs. typical 50pF JFETs) and integrated ESD protection provide improved high-frequency stability and robustness.

Does BSS126SK-7 have a body diode, and what is its forward voltage?

Yes - it integrates a parasitic source-drain body diode. At I_S = 16mA and V_GS = −5V, the forward voltage is 0.7V (typical), rising to 1.3V (max) per the Electrical Characteristics table. This diode enables freewheeling in inductive loads but must be evaluated for reverse recovery (t_RR = 164ns) in switching applications.

BSS126SK-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel, Depletion Mode

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 600 V

Current - Continuous Drain (Id) @ 25°C:: 30mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 0V, 10V

Rds On (Max) @ Id, Vgs:: 500Ohm @ 16mA, 10V

Vgs(th) (Max) @ Id:: 1.4V @ 8µA

Gate Charge (Qg) (Max) @ Vgs:: 2 nC @ 5 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 30.9 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 1W (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BSS126SK-7 FAQ

1.How can I place an order for BSS126SK-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS126SK-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 BSS126SK-7 reliable?

The price and inventory of BSS126SK-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS126SK-7 is usually 5 days.

3.What payment methods are accepted for BSS126SK-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS126SK-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS126SK-7?

BSS126SK-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS126SK-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 BSS126SK-7?

For technical support, including BSS126SK-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS126SK-7 requirements.

6.How does Aetrix verify that BSS126SK-7 is sourced from the original manufacturer or authorized distributors?

All BSS126SK-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 BSS126SK-7 meets industry standards.

7.What is the process for return or replacement of BSS126SK-7?

All BSS126SK-7 units undergo pre-shipment inspection (PSI). If there is an issue with BSS126SK-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 BSS126SK-7 part is unused and in its original packaging.

Return procedure for BSS126SK-7:

1.Submit a request within 90 days.

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

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