VCR2N_05 TOSHIBA | Alldatasheet

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Document Number: 70293 S-41225—Rev. F, 28-Jun-04 www.vishay.com JFET Voltage-Controlled Resistors PRODUCT SUMMARY Part Number VGS(off) Max (V) V(BR)GSS Min (V) rDS(on) Max (/C0087) VCR2N −7 −25 60 VCR4N −7 −25 600 VCR7N −5 −25 8000 FEATURES BENEFITS APPLICATIONS /C0068Continuous Voltage-Controlled Resistance /C0068High Off-Isolation /C0068High Input Impedance /C0068Gain Ranging Capability/Wide Range Signal Attenuation /C0068No Circuit Interaction /C0068Simplified Drive /C0068Variable Gain Amplifiers /C0068Voltage Controlled Oscillator /C0068AGC

DESCRIPTION

The VCR2N/4N/7N JFET voltage controlled resistors have an ac drain-source resistance that is controlled by a dc bias voltage (VGS) applied to their high impedance gate terminal. Minimum rDS occurs when VGS = 0 V. As VGS approaches the pinch-off voltage, rDS rapidly increases. This series of junction FETs is intended for applications where the drain-source voltage is a low-level ac signal with no dc component. Key to device performance is the predictable r DS change versus VGS bias where: rDSbias /C0091 rDS(@ VGS /C00430) 1–/C0356 VGS VGS(off) /C0356 These n-channel devices feature r DS(on) ranging from 20 to 8000 /C0087 . All packages are hermetically sealed and may be processed per MIL-S-19500 (see Military Information). D S G and Case TO-206AA (TO-18) Top View S C TO-206AF (TO-72) D G Top View VCR2N, VCR4N VCR7N For applications information see AN105.

www.vishay.com Document Number: 70293 S-41225—Rev. F, 28-Jun-04 ABSOLUTE MAXIMUM RATINGSa Notes: a. T A = 25/C0095C unless otherwise noted. b. Derate 2 mW/ /C0095C above 25/C0095C. SPECIFICATIONS (TA = 25/C0095C UNLESS OTHERWISE NOTED) Limits VCR2N VCR4N VCR7N Parameter Symbol Test Conditions Typa Min Max Min Max Min Max Unit Static Gate-Source Breakdown Voltage V(BR)GSS IG = −1 /C0109A, VDS = 0 V −55 −25 −25 −25 V Gate-Source Cutoff Voltage VGS(off) VDS = 10 V, ID = 1 /C0109A −3.5 −7 −3.5 −7 −2.5 −5 V Gate Reverse Current IGSS VGS = −15 V, VDS = 0 V −5 −0.2 −0.1 nA VGS = 0 V, ID = 10 mA 20 60 Drain-Source On-Resistance rDS(on) VGS = 0 V, ID = 1 mA 200 600 /C0087DS(on) VGS = 0 V, ID = 0.1 mA 4000 8000 Gate-Source Forward Voltage VGS(F) VDS = 0 V, IG = 1 mA 0.7 V Dynamic Drain-Source On-Resistance rds(on) VGS = 0 V, ID = 0 mA f = 1 kHz 20 60 200 600 4000 8000 /C0087 Drain-Gate Capacitance Cdg VGD = −10 V, IS = 0 mA f = 1 MHz 7.5 3 1.5 pF Source-Gate Capacitance Csg VGS = −10 V, ID = 0 mA f = 1 kHz 7.5 3 1.5 pF Notes: NCB/NPA/NT a. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. TYPICAL CHARACTERISTICS (TA = 25/C0095C UNLESS OTHERWISE NOTED) 0 0.2 0.4 0.6 0.8 1 Output Characteristics (VCR2N) VDS − Drain-Source Voltage (V) −0.5 V −2.0 V −2.5 V −1.0 V −1.5 V Output Characteristics (VCR4N) VDS − Drain-Source Voltage (V) −3.0 V 1.0 0.8 0.6 0.4 0.2 VGS(off) = −4 V VGS = 0 V VGS(off) = −4.2 V VGS = 0 V −4.0 V −3.5 V −1.5 V −2.0 V −3.0 V −2.5 V ID − Drain Current (mA) ID − Drain Current (mA)

Document Number: 70293 S-41225—Rev. F, 28-Jun-04 www.vishay.com TYPICAL CHARACTERISTICS (TA = 25/C0095C UNLESS OTHERWISE NOTED) 0 0.2 0.4 0.6 0.8 1 Output Characteristics (VCR7N) VDS − Drain-Source Voltage (V) 200 160 120 −0.5 V −2.0 V −1.0 V −1.5 V VGS(off) = −2.5 V VGS = 0 V ID − Drain Current (/C0109A)

APPLICATIONS

A simple application of a FET VCR is shown in Figure 1, the circuit for a voltage divider attenuator. VIN FIGURE 1. Simple Attenuator Circuit

Document Number: 91000 www.vishay.com Revision: 08-Apr-05 1 Notice Specifications of the products displayed herein are subjec t to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale.