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

Diodes Incorporated BSS126SK-13

Name: BSS126SK-13
Brand: Diodes Incorporated
SKU: BSS126SK-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS126SK-13

Manufacturer:: Diodes Incorporated

Category:: FETs, MOSFETs

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

Datasheet:: BSS126SK-13.pdf

Description:: DIODE GP SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:6,092

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Product details

Overview

BSS126SK from Diodes Incorporated is an N-channel depletion-mode MOSFET rated for 600 V drain-source voltage, with a typical on-resistance of 111 Ω at V_GS = 10 V and 7 mA zero-gate-voltage drain current (I_DSS). It operates as a normally-on high-voltage level shifter or small-signal switching device in DC-DC converters and backlighting circuits.

For engineers reviewing the BSS126SK datasheet, BSS126SK pinout, BSS126SK application, or BSS126SK equivalent, key selection criteria include its 600 V BV_DSS, depletion-mode operation (V_GS(TH) = −2.2 V typ), SOT23 package thermal limits, and ESD-protected gate structure for robust level-shift reliability.

Technical Context

This MOSFET uses planar silicon technology to achieve stable depletion-mode behavior with tightly controlled threshold voltage (−2.7 to −1.4 V) and low gate charge (Q_g = 2 nC). Its internal body diode supports bidirectional conduction in flyback or bootstrap configurations.

The device exhibits strong temperature stability: R_DS(ON) increases only ~1.4× from −55°C to +150°C at I_D = 3 mA, and V_GS(TH) drifts <0.5 V over the same range-critical for precision biasing in automotive-grade power management.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	600 V - Enables direct use in 400 V AC rectified rails without external clamping
I_DSS @ V_GS = 0 V	7 mA min - Defines default conduction state for self-biasing in constant-current sources
R_DS(ON)	111 Ω typ @ V_GS = 10 V - Sets maximum on-state loss of 78 mW at 25 mA drain current
V_GS(TH)	−2.2 V typ @ I_D = 8 µA - Determines minimum gate drive swing needed to fully turn off
C_iss	30.9 pF - Limits high-frequency gate drive power and enables >1 MHz switching in low-power SMPS
Q_g	2 nC - Allows efficient driving with sub-100 mA gate drivers in compact space-constrained designs
T_J Range	−55°C to +150°C - Supports under-hood automotive and industrial ambient environments

Pinout & Package

Package: SOT23 - Surface-mount plastic case with matte tin–annealed copper leadframe, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Current return path for depletion-mode channel	Connected to ground or low-side reference; carries full load current in level-shift mode
2 (Gate)	Control electrode for channel depletion	ESD-protected input requiring ≤±20 V drive; negative bias turns device off
3 (Drain)	High-voltage output terminal	Handles up to 600 V; connects to HV rail or transformer primary in flyback topologies

Key Features

Feature	Design Value
Depletion-mode operation	Enables zero-power startup and self-biased constant-current sources without external bias networks
ESD protection	HBM rating ≥2 kV ensures robustness during PCB handling and automated assembly
Lead-free & green compliance	Fully RoHS 3 and halogen/antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) for automotive and industrial eco-regulatory alignment
Thermal resistance	R_θJA = 124.7°C/W on FR-4 - permits 1 W dissipation at ≤50°C ambient with minimal heatsinking

Applications

Motor Control

Backlighting

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

IC Role / Device Role / Timing Role: High-side depletion-mode switch controlling 24–48 V coil current with fast turn-off via negative gate bias.

Use Value: Eliminates need for floating gate driver; 600 V rating accommodates inductive kickback without snubbers.

Use Scenario: CCFL or LED string current regulation in industrial panel displays.

IC Role / Device Role / Timing Role: Constant-current source configured with source degeneration resistor and gate tied to fixed bias.

Use Value: I_DSS tolerance (7 mA min) enables ±10% current accuracy without trimming; stable over −40°C to +85°C.

DC-DC Converters

Power Management

Use Scenario: Auxiliary bias winding regulation in offline flyback converters delivering <5 W.

IC Role / Device Role / Timing Role: Synchronous rectifier or feedback signal level shifter across isolation barrier.

Use Value: C_iss = 30.9 pF minimizes gate drive loss; t_F = 873 ns supports <500 kHz operation with clean edge control.

Use Scenario: Standby power sequencer enabling main PMIC after AC detection in smart meters.

IC Role / Device Role / Timing Role: Normally-on HV switch that disables downstream circuitry until gate is pulled negative.

Use Value: Depletion-mode behavior guarantees fail-safe "on" state during MCU reset or brownout conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IXYS IXTP01N60D	Higher V_DSS (600 V), but higher R_DS(ON) (1200 Ω typ @ V_GS = 0 V); TO-92 package	Designed for linear-mode constant-current sinks, not fast switching	Select when ultra-low standby current (<1 µA) is prioritized over switching speed
Vishay SI2301DS	Enhancement-mode P-channel (−20 V V_DS), not depletion-mode; SOT23 package	Requires active gate pull-up; unsuitable for self-biasing or fail-safe "on" behavior	Choose only if system design mandates enhancement-mode logic compatibility and low-voltage operation

Compared with IXTP01N60D and SI2301DS, the BSS126SK uniquely combines SOT23 footprint, 600 V capability, depletion-mode default-on behavior, and sub-100 Ω R_DS(ON)-enabling compact, fail-safe, high-voltage level shifting unattainable with either alternative.

Availability

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

Supply support for BSS126SK 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 belongs to Diodes' high-voltage MOSFET product line, engineered specifically for depletion-mode level shifting, constant-current sourcing, and compact high-voltage switching in space-constrained industrial and automotive subsystems.

FAQ

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

The BSS126SK is a confirmed N-channel depletion-mode MOSFET. It conducts at V_GS = 0 V (I_DSS = 7 mA min), requires negative gate voltage (≤−1.4 V) to fully turn off, and has a gate threshold voltage V_GS(TH) of −2.2 V typical-verified by electrical characterization in DS42517 Rev. 3.

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

At T_A = +70°C, the BSS126SK supports 24 mA continuous drain current (Note 5, FR-4 board) or 28 mA (Note 6, enhanced copper board), limited by thermal resistance (R_θJA = 124.7°C/W or 95.5°C/W) and 1 W or 1.3 W power dissipation ratings.

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

Yes-the BSS126SK is a direct functional replacement for high-voltage N-channel JFETs (e.g., 2N5484) in bias networks and constant-current sources, offering identical depletion-mode behavior, higher BV_DSS (600 V vs. ~40 V), lower R_DS(ON), and integrated ESD protection per DS42517.

Does the BSS126SK have a built-in body diode, and what is its forward voltage?

Yes, it includes an intrinsic source-drain body diode with V_SD = 0.7 V typical at I_S = 16 mA and V_GS = −5 V. This diode is rated for reverse recovery charge Q_RR = 382 nC and reverse recovery time t_RR = 164 ns-suitable for non-synchronous flyback catch paths.

BSS126SK-13 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-13 FAQ

1.How can I place an order for BSS126SK-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS126SK-13 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-13 reliable?

The price and inventory of BSS126SK-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS126SK-13 is usually 5 days.

3.What payment methods are accepted for BSS126SK-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS126SK-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS126SK-13?

BSS126SK-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS126SK-13 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-13?

For technical support, including BSS126SK-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS126SK-13 requirements.

6.How does Aetrix verify that BSS126SK-13 is sourced from the original manufacturer or authorized distributors?

All BSS126SK-13 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-13 meets industry standards.

7.What is the process for return or replacement of BSS126SK-13?

All BSS126SK-13 units undergo pre-shipment inspection (PSI). If there is an issue with BSS126SK-13, 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-13 part is unused and in its original packaging.

Return procedure for BSS126SK-13:

1.Submit a request within 90 days.

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

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