Token's high Q chip RF inductors are designed for resonant circuit applications requiring exceptionally high Q's and tight tolerances on inductance specifications. Chip RF Inductors can be customed designs and tighter tolerances available on request. Application of RF Inductors specific designs also available including different inductance values and Q specifications adjusted to frequency requirements.
Token SMD Wirewound Inductors extend inductance range for low-profile, high-current inductors and provides efficient operation and power savings. Power surface mount inductors are primarily designed for choking power lines and conform to the RoHS directive.
Token Choke Coils of Surface Mount Device SMD inductor is primarily designed for choking power lines and conforms to the RoHS directive lead-free. SMD Choke coils has good heat durability that withstands lead-free compatible reflow soldering conditions. Token SMD Coils including: SMD common mode choke coils, SMD common mode EMI filters, and RFID transponder coils.
Token Electronics, a world leading innovator in inductor manufactures a full line of inductors, colis, magnetic products, which includes the most extensive offering of surface mount and lead type inductor. These devices are used in a wide variety of applications in a wide range of markets including networking, telecom, computers, switching power supply, and peripherals.
A passive component designed to resist changes in current. Inductors are often referred to as "AC resistors".
Download PDFInductor color coding system applies coating inductors of the axial lead type.
This system is employed for inductors when the surface area is not sufficient to print the inductance value for the past time.
Tape and Reel Specifications of Surface Mount Multilayer Inductor, Ceramic Inductor, Chip Beads, Wirewound SMD Inductor, Chip Coils, and Choke Coils.
Download PDFToken Cuts Inductor Size and Cost. How to quickly search RF inductors for all of the characteristics? Inductors Selection Notes.
Download PDFSelecting The Optimum Indcutor Choke to Best Match The Right Performance. Comparision of Inductor Factors for Applications.
Download PDFHow to Quickly Search Inductor for all of the Characteristics? Leading-Edge Technology. Find Inductor Solutions Faster.
Download PDFSelecting The Optimum Inductor Technology to Best Match The Performance Requirements. How to Select the Right Inductor for DC-DC Converter?
Download PDFToken Electronics brand passive component specializes in standard and custom solutions offering the latest in state-of-the-art low profile high power density inductor components. Token provides cost-effective, comprehensive solutions that meet the evolving needs of technology-driven markets.
Download PDFAir Core Inductor, Axial Inductor, RF Choke, What is Inductor, DCR (DC Resistance), EMI, Ferrite Core, etc.
Download PDFInductance, Q Factor, DCR (DC Resistance), SRF (Self-Resonant Frequency), Dielectric Strength, Maximum Allowable Current, Solderability, etc.
Download PDFIn a RF balun transformer, one pair of terminals is balanced, that is, the currents are equal in magnitude and opposite in phase.
The other pair of terminals is unbalanced; one side is connected to electrical ground and the other carries the signal.
What is Balun Transformer? Why Use a Balun? Insertion Loss (dB). Basics of Broadband Transformers.
Download PDFThat property of a circuit element which tends to oppose any change in the current fl owing through it.
The inductance for a given inductor is infl uenced by the core material, core shape and size, the turns count, and the shape of the coil.
Inductors most often have their inductances expressed in microhenries (μH).
The following table can be used to convert units of inductance to microhenries.
Thus, 47 mH would equal 47,000 μH.
1 henry (H) = 10^{6} μH
1 millihenry (mH) = 10^{3} μH
1 microhenry (μH) = 1 μH
1 nanohenry (nH) = 10^{-3} μH
The resistance of the inductor winding measured with no alternating current. The DCR is most often minimized in the design of an inductor. The unit of measure is ohms, and it is usually specifi ed as a maximum rating.
The DC bias current fl owing through the inductor which causes the inductance to drop by a specifi ed amount from the initial zero DC bias inductance value. Common specifi ed inductance drop percentages include 10% and 20%.
It is useful to use the 10% inductance drop value for ferrite cores and 20% for powdered iron cores in energy storage applications. The cause of the inductance to drop due to the DC bias current is related to the magnetic properties of the core.
The core, and some of the space around the core, can only store a given amount of magnetic flux density. Beyond the maximum flux density point, the permeability of the core is reduced. Thus, the inductance is caused to drop. Core saturation does not apply to "air-core" inductors. (Also see Incremental Current and Permeability)
The DC bias current flowing through the inductor which causes an inductance drop of 5% from the initial zero DC bias inductance value. This current level indicates where the inductance can be expected to drop signifi cantly if the DC bias current is increased further.
This applies mostly to ferrite cores in lieu of powdered iron. Powdered iron cores exhibit "soft" saturation characteristics. This means their inductance drop from higher DC levels is much more gradual than ferrite cores.
The rate at which the inductance will drop is also a function of the core shape. (Also see Saturation Current).
The level of continuous DC current that can be passed through the inductor. This DC current level is based on a maximum temperature rise of the inductor at the maximum rated ambient temperature.
The rated current is related to the inductor's ability to minimize the power losses in the winding by having a low DC resistance. It is also related to the inductor's ability to dissipate this power lost in the windings.
Thus, the rated current can be increased by reducing the DC resistance or increasing the inductor size. For low frequency current waveforms, the RMS current can be substituted for the DC rated current. The rated current is not related to the magnetic properties of the inductor. (Also see Incremental Current and Saturation Current)
The permeability of a magnetic core is the characteristic that gives the core the ability to concentrate lines of magnetic flux. The core material, as well as the core geometry, affect the core's "effective permeability".
For a given core shape, size and material, and a given winding, higher permeability magnetic materials result in higher inductance values as opposed to lower permeability materials.
The frequency at which the inductor's distributed capacitance resonates with the inductance. It is at this frequency that the inductance is equal to the capacitance and they cancel each other. The inductor will act purely resistive, with a high impedance at the SRF point.
The distributed capacitance is caused by the turns of wire layered on top of each other and around the core. This capacitance is in parallel to the inductance. At frequencies above the SRF, the capacitive reactance of the parallel combination will become the dominant component.
Also, the Q of the inductor is equal to zero at the SRF point since the inductive reactance is zero. The SRF is specifi ed in MHz and is listed as a minimum value on product data sheets. (Also see Distributed Capacitance)
In the construction of an inductor, each turn of wire or conductor acts as a capacitor plate. The combined effects of each turn can be represented as a single capacitance known as the distributed capacitance. This capacitance is in parallel with the inductor.
This parallel combination will resonate at some frequency which is called the self-resonant frequency (SRF). Lower distributed capacitances for a given inductance value will result in a higher SRF value for the inductor and vice versa. (Also see SRF)
The Q value of an inductor is a measure of the relative losses in an inductor.
The Q is also known as the "quality factor" and is technically defi ned as the ratio of inductive reactance to effective resistance, and is represented by:
Q = \frac{X_{L}}{Re} = \frac{2πfL}{Re}
Since X_{L} and Re are functions of frequency, the test frequency must be given when specifying Q.
X_{L} typically increases with frequency at a faster rate than Re at lower frequencies, and vice versa at higher frequencies.
This results is a bell-shaped curve for Q vs frequency. Re is mainly comprised of the DC resistance of the wire, the core losses and skin effect of the wire. Based on the above formula, it can be shown that the Q is zero at the self-resonant frequency since the inductance is zero at this point.
The impedance of an inductor is the total resistance to the fl ow of current, including the AC and DC component.
The DC component of the impedance is simply the DC resistance of the winding. The AC component of the impedance includes the inductor reactance.
The following formula calculates the inductive reactance of an ideal inductor (i.e., one with no losses) to a sinusoidal AC signal:
Z = XL = 2πfL
L is in henries and f is in hertz. This equation indicates that higher impedance levels are achieved by higher inductance values or at higher frequencies.
Skin effect and core losses also add to the impedance of an inductor. (Also see Skin Effect and Core losses)
Range of ambient temperatures over which a component can be operated safely.
The operating temperature is different from the storage temperature in that it accounts for the component's self temperature rise caused by the winding loss from a given DC bias current.
This power loss is referred to as the “copper” loss and is equal to:
Power Loss = (DCR)(I^{2}_{dc})
Download Inductor & Coils Technology in PDF file.
All Token RoHS-compliant parts are backward compatible with tin-lead soldering processes. Soldering temperature must be greater than 230°C to ensure proper melting of lead-free solder.
For all soldering methods, the optimal reflow profile for a circuit board assembly is dependent on the solder material, solder amount, flux, temperature limit of each soldered component, heat transfer characteristics of the circuit board and component materials, and the layout of all components.
The temperature versus time limitation of the least robust component of the circuit board assembly ultimately may determine the actual temperature profile that must be used. For these reasons, Token does not specify soldering profiles for our components.
This typical reflow profile is based on IPC/JEDEC J-STD-020 Revision D.1 (March 2008). It is provided only as a guide.
For additional information, refer to these web sites: www.jedec.org.
All our RoHS-compliant parts are backward compatible with tin-lead soldering processes.
For all soldering methods, the optimal soldering profile for a circuit board assembly is dependent on the solder material, solder amount, flux, temperature limit of each soldered component, heat transfer characteristics of the circuit board and component materials, and the layout of all components.
The temperature vs. time limitation of the least robust component of the circuit board assembly ultimately dictates the optimal temperature profile. For this reason, Token does not provide soldering profiles for our components.
All our RoHS-compliant parts are backward compatible with tin-lead soldering processes.
Soldering temperature must be greater than 230°C to ensure proper solder melting.
For all soldering methods, the optimal reflow profile for a circuit board assembly is dependent on the solder material, solder amount, flux, temperature limit of each soldered component, heat transfer characteristics of the circuit board and component materials, and the layout of all components.
The temperature versus time limitation of the least robust component of the circuit board assembly ultimately may determine the actual temperature profile that must be used. For these reasons, Token does not specify soldering profiles for our components.
A typical reflow profile based on IPC/JEDEC J-STD-020 Revision D.1 (March 2008) is provided only as a guide.
All of Token’s through-hole components are designed to be wave soldered and it is not recommended to use a reflow soldering procedure. The higher temperatures of reflow soldering may damage these components.
Token’s through-hole components can be successfully wave soldered as long as care is taken throughout the process. For many of the components, it is essential to minimize the circuit board temperature and the time spent over the solder nozzle.
In order to achieve a quality bond without damaging the components, Token recommends preheating the board for up to three minutes and limiting the time the board spends over the solder nozzle to three seconds.
Download Typical RoHS Reflow Profile in PDF file.
nH | µH | SAP |
1 | 1N0 | |
1.2 | 1N2 | |
1.5 | 1N5 | |
1.8 | 1N8 | |
2.2 | 2N2 | |
2.7 | 2N7 | |
3.3 | 3N3 | |
3.9 | 3N9 | |
4.7 | 4N7 | |
5.6 | 5N6 | |
6.8 | 6N8 | |
8.2 | 8N2 | |
10 | 0.01 | 10N |
12 | 0.012 | 12N |
15 | 0.015 | 15N |
18 | 0.018 | 18N |
22 | 0.022 | 22N |
27 | 0.027 | 27N |
33 | 0.033 | 33N |
39 | 0.039 | 39N |
47 | 0.047 | 47N |
56 | 0.056 | 56N |
68 | 0.068 | 68N |
82 | 0.082 | 82N |
100 | 0.1 | R10 |
120 | 0.12 | R12 |
150 | 0.15 | R15 |
180 | 0.18 | R18 |
220 | 0.22 | R22 |
270 | 0.27 | R27 |
330 | 0.33 | R33 |
390 | 0.39 | R39 |
470 | 0.47 | R47 |
560 | 0.56 | R56 |
680 | 0.68 | R68 |
nH | µH | SAP |
820 | 0.82 | R82 |
1 | 1R0 | |
1.2 | 1R2 | |
1.5 | 1R5 | |
1.8 | 1R8 | |
2.2 | 2R2 | |
2.7 | 2R7 | |
3.3 | 3R3 | |
3.9 | 3R9 | |
4.7 | 4R7 | |
5.6 | 5R6 | |
6.8 | 6R8 | |
8.2 | 8R2 | |
10 | 100 | |
12 | 120 | |
15 | 150 | |
18 | 180 | |
22 | 220 | |
27 | 270 | |
33 | 330 | |
39 | 390 | |
47 | 470 | |
56 | 560 | |
68 | 680 | |
82 | 820 | |
100 | 101 | |
120 | 121 | |
150 | 151 | |
180 | 181 | |
220 | 221 | |
270 | 271 | |
330 | 331 | |
390 | 391 | |
470 | 471 |
nH | µH | SAP |
560 | 561 | |
680 | 681 | |
820 | 821 | |
1000 | 102 | |
1200 | 122 | |
1500 | 152 | |
1800 | 182 | |
2200 | 222 | |
2700 | 272 | |
3300 | 332 | |
3900 | 392 | |
4700 | 472 | |
5600 | 562 | |
6800 | 682 | |
8200 | 822 | |
10 000 | 103 | |
12 000 | 123 | |
15 000 | 153 | |
18 000 | 183 | |
22 000 | 223 | |
27 000 | 273 | |
33 000 | 333 | |
39 000 | 393 | |
47 000 | 473 | |
56 000 | 563 | |
68 000 | 683 | |
82 000 | 823 | |
100 000 | 104 | |
120 000 | 124 | |
150 000 | 154 | |
180 000 | 184 | |
220 000 | 224 | |
270 000 | 274 | |
330 000 | 334 |
B | C | S | D | F | G | H |
± 0.15 nH | ± 0.2 nH | ± 0.3 nH | ± 0.5 nH | ± 1 % | ± 2 % | ± 3 % |
J | K | L | M | V | N | |
± 5 % | ± 10 % | ± 15 % | ± 20 % | ± 25 % | ± 30 % |
Download Inductance and Tolerance Table in PDF file.