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LSK170 JFET Data
Data for the LSK170 JFET including electrical parameters, maximum current and voltage, pin connections, package type and many other datasheet details.
The LSK170 JFET, is specifically designed for low noise, high input impedance applications within the audio, instrumentation, medical and sensors markets.
there are four variants, LSK170A, LSK170B, LSK170C and LSK170D with different levels of drain source saturation current.
The narrow ranges of IDSS grades with the LSK170 promote ease of design, particularly in low voltage applications.
The LSK170 is ideal for portable battery operated applications, and features high BVDSS for maximum linear headroom in high transient program content amplifiers.
These JFETs have a uniquely linear VGS transfer function for a stability that is highly desirable, particularly for audio front-end preamplifiers.
Key details and performance parameters for the LSK170 JFET.
| LSK170 JFET datasheet parameters & data |
|
|---|---|
| Parameters | Details |
| Brief description | High Input Impedance, Ultra-Low Noise, Single N-Channel JFET |
| Package type | TO92, SOT23-3, SOT89-3 |
| Gate to source breakdown voltage BVGSS | -40V min at VDS = 0V and ID = -10µA |
| Drain source saturation current IDSS | LSK170A: 2.2mA min, 6.5mA max LSK170B: 6.0mA min, 12mA max LSK170C: 10mA min, 20mA max LSK170D: 18mA min, 30mA max |
| Gate operating current IG | -0.5nA max |
| Gate source leakage current current IGSS | -1nA max |
| Full conduction transconductance gFS | 14mS min, 22mS typical at VDS = 10V and ID = 2mA |
| Typical conduction transconductance gFS | 6mS min, 10mS typical at VDS = 15V and ID = 1mA |
| Input capacitance | 20.0pF |
| Transfer reverse capacitance | 5pF |
| TJ °C | 135°C |
| PTOT mW | 400mW |
| Primary manufacturer | Linear Systems |
Outlines & pinout:
Explanation of JFET parameters
| Parameter | Explanation |
|---|---|
| Operational mode | This details whether the FET is an enhancement or depletion mode |
| Channel type | The channel of the JFET can either be an N-type channel where electrons are the majority carriers or P-type where holes are the majority current carrier. |
| Drain to Source voltage VDSS | This is the maximum voltage that can be sustained between the drain and source |
| Gate to source voltage VGSS | This is the maximum voltage that can be sustained between the drain and the gate. |
| Maximum drain current continuous ID | This is the maximum current that can be carried byt he device. Sometimes there may be a differentiation between the continuous and pulsed or peak values |
| Parameter | Explanation |
|---|---|
| Zero gate voltage drain current IDSS | This is the current carried by the device when the gate voltage is zero. The test conditions are normally stated for this. |
| Gate threshold voltage VGS(th) | This is the minimum gate-to-source voltage, VGS required to create a conductive channel between the source and drain terminals |
| Static drain source ON resistance RDS(ON) | This is the resistance of the device when turned on. The test conditions of voltage and current are normally given for this. |
| Drain source ON voltage VDS(ON) | This is the voltage across the device when it is turned on. Again the test conditions are given. |
| Forward transconductance gFS | Forward transconductance also given the letters gm is defined as the change in drain current (ΔID) for a small change in the gate-source voltage ΔVGS, with the drain-source voltage, VDS held constant. |
These are the main JFET parameters that have been included in our list. There are others, but these are the main ones and they help quantify the main elements of the performance.
Please note, that the data given is the best estimate we can give within a tabulated summary of this nature. Parameters also vary between manufacturers. Electronics Notes cannot accept any responsibility for errors, inaccuracies, etc, although we do endevaour to ensure the data is as accurate as possible.
Notes and supplementary information
• Availability & sources
The LSK170 is available from a number of stockists and electronic component distributors many of which are given in the table below.
LSK170 Component Distributor, Stock and Pricing
• Further details
The LSK170 is available in a surface mount SOT-23 package, through-hole TO-92 package and SOT-89 package.
The surface mount version of the LSK170 series creates new opportunities for engineers seeking to design lower noise circuits in compact embeddable applications where shielding and space are critical.
The LSK170 series is a pin for pin replacement of the Toshiba 2SK170 and improved functional replacement for the Interfet IF1320, IF1330, IF1331, and IF4500.
Written by Ian Poole .
Experienced electronics engineer and author.
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