SMD Wirewound and Power Inductors

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Searching and comparing data sheets of inductor manufacturers can be time consuming. Token’s Parameter Sorting Search Mode allows selection of inductors based on different parameters.
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Download Power Wirewound Surface Mount Inductor Catalogue in PDF file (2.12MB).

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Token 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. In working closely with the industry leaders in chipset and core development, we remain at the forefront of innovation and new technology to deliver the optimal mix of packaging, high efficiency and unbeatable reliability. Our designs utilize high frequency, low core loss materials, new and custom core shapes in combination with innovative construction and packaging to provide designers with the highest performance parts available on the market.

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Selecting the correct inductor solution will not only save you time, but it will give you a competitive edge. At Token, we are committed to helping you find the most efficient alternative for your power design. Our inductor and power supply design experts can help you make that selection.

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SMD Shielded Inductors

ThumbnailDescription Type DCR (Ω) Inductance (μH)

  • 1 (TPSME) Low-Profile Inductors Shielded 0.040~2.433 1.0~100 Token Electronics has added two new ranges of low-profile wirewound chip inductors, TPSME3010 and TPSME3015, for use in DC-DC converter applications to increase flexibility of maximum height measurements with extended electrical characteristics. Both winding chip coils the TPSME3010 series and TPSME3015 series of inductors offer low DC resistance and large rated current. This is vital for DC-DC converter applications as it prevents energy dissipation from the chip inductor, improving the converter's overall efficiency.
    Download (TPSME) PDF (453KB)

  • 2 (TPSPA) SMD High Saturation Inductors Shielded 0.00047~0.270 0.10~4.70 Token's Power TPSPA inductor features high saturation current and low direct current resistance (DCR) in a rugged surface-mount package. Available in three industry-standard footprint (6.8 mm x 7.1 mm), (10.5 mm x 11.5 mm), and (12.8 mm x 13.2 mm) with a profile from 3.0 mm to 6.5 mm maximum, the TPSPA inductors use an advanced core material that operating temperature range from -25°C to +125°C, and are said to provide the lowest DCR of any inductor in this size and profile.
    Download (TPSPA) PDF (425KB)

  • 3 (TPSDC) SMD Low-DCR Inductors | P2 | P3 Shielded 0.021~32.800 1.00~10000.00 To meet the electrical demands of next-generation products such as microprocessors, high-current DC/DC converters and telecom equipment, the wirewound TPSDC low DCR Inductors from Token Electronic targets applications that require wide range inductance, lower DCR and high current.
    Download (TPSDC) PDF (429KB) | P2 (392KB) | P3 (392KB)

  • 4 (TPSDS) Low-DCR Low-Profile Wirewound Inductors Shielded 0.010~1.500 1.10~680.00 Token's new TPSDS surface mount inductor has improved and combined three key factors of low direct current resistance (DCR), high-current, and low-profile in one package. This consists of the internal wound coil being packed tightly with magnetic iron powder and a shielded case that helps the inductor to produce a much lower audible noise.
    Download (TPSDS) PDF (439KB)

  • 5 (TPSRB) Power Surface Mount Inductors Shielded 0.060~1.500 10.00~470.00 The TPSRB series of wire wound, surface-mount inductor from Token Electronics is designed for general purpose inductor to eliminate EMI in power lines for telecommunications, test & measurement equipment, networking, portable electronic equipment, PCs, appliances, and other electronic devices.
    Download (TPSRB) PDF (383KB)

  • 6 (TPSRH) SMD Shielded Inductors | P2 | P3 | P4 | P5 | P6 | P7 | P8 Shielded 0.007~9.260 1.20~1000.00 Token enhances power shielded inductor TPSRH family series covering complete footprint with profile from 1.8 mm to 8.0 mm, inductance from 1.00 μ to 1000.00 μ, low DCR, and Rated Current uo to 10.0A. TPSRH with wire wound and magnetically shielded construction offers a variety of characteristics and high performace. Customers can select the optimum characteristics by choosing from footprint, DCR, and a wide range of inductance values and tolerances with some types offering magnetic shielding.
    Download (TPSRH) PDF (365KB) | P2 (381KB) | P3 (436KB) | P4 (490KB) | P5 (427KB) | P6 (426KB) | P7 (496KB) | P8 (404KB)

  • 7 (TPSLF) Wire Wound SMD Inductors | P2 Shielded 0.005~1.100 1.20~1500.00 Token has once again extended its TPSLF family of high-current, wire wound, low-profile inductors with a new device that offers the lowest direct current resistance (DCR) available in a compact (6.2mm x 6.2mm), (7.4mm x 7.4mm), (10.1mm x 10.1mm), (12.5mm x 12.5mm) package with a low 3.0mm, 3.5mm, 4.5mm, 5.1mm, 5.5mm, 6.5mm, and 7.5mm height profile.
    Download (TPSLF) PDF (395KB)

  • 8 (TPSDBL) SMD Backlight Inductor (High Voltage Inductor) Shielded 0.950~74.000 100.00~10000.00 Token TPSDBL low profile backlight inductor (high voltage inductor) is specified for backlight applications, such as PDA, USB, LCD, and TFT. The TPSDBL is constructed of high temperature materials that provide excellent heat deflection to prevent damage during solder reflow. Standard inductance values range from 100.00 μH to 10000.00 μH, DCR from 0.95Ω to 74Ω, current rating from 0.01A to 0.22A, and custom values are available on request to meet specific requirements.
    Download (TPSDBL) PDF (356KB)

  • 9 (TPSH) SMD Low-Profile Low-DCR Inductors Shielded 0.009~19.110 1.00~1000.00 Like many components in the industry, inductors are being impacted by the trend toward smaller electronic devices with enhanced functionality requiring increased density of components on the board. Token introduces low-profile, high-current inductor in case size. The TPSH inductor offers designers a high-current solution using a larger part, without exceeding a profile of 1.2 mm on either side of the PC board.
    Download (TCSH) PDF (498KB)

SMD Unshielded Inductors

ThumbnailDescription Type DCR (Ω) Inductance (μH)

  • 1 (TPUD) SMD Low-Profile Wirewound Power | P2 | P3 Unshielded 0.021~32.800 2.20~100.00 Token TPUD wirewound unshielded inductors are designed for the smallest possible size and high performance with high energy storage and very low resistance. Those devices are ideal for notebook, DC-DC converter, digital camera and scanner, LCD Driver, and CD-Rom. Utilize open Magnetic circuit construction and advance winding technology in manufacturing low profile TPUD inductors. The maximum height of TPUD4006/4008 is only 0.8/1.0 mm, TPUD4011/4013 1.2/1.45 mm, and TPUD5011/5013 1.2/1.5 mm.
    Download (TPUD) PDF (412KB) | P2(412KB) | P3(412KB)

  • 2 (TPUA) Miniature Low-Profile Surface Mount Inductor Unshielded 0.010~15.600 1.00~1000.00 Miniaturisation of today's electrical and electronic devices requires component manufacturers to increase the performance of components without increasing footprint. Token's latest (TPU×××A) wirewound SMD inductor offers improved performance in the same compact, low-profile case size.
    Download (TPUA) PDF (495KB)

  • 3 (TPUDF) SMD unshielded Power Wirewound | P2 | P3 Unshielded 0.009~13.800 1.00~1000.00 TPUDF power unshielded inductor metalized drum core design utilizes board space and general use by Token's automatic wire wound technology and ferrite core. The TPUDF inductor is designed for DC-DC converter applications and features reduced DC resistance and increased allowable current. In DC-DC converters and power supplies, the performance of the power components directly affects the overall efficiency of the supply, so it is of paramount importance.
    Download (TPUDF) PDF (407KB) | P2 (407KB) | P3 (407KB)

  • 4 (TPUDHP) Surface Mount Large Current Inductor | P2 | P3 Unshielded 0.002~0.470 0.33~47.00 Token SMT unshielded (TPU××××DHP) inductors utilize wire wound technology with open magnetic circuit construction enabling cost-effective in manufacturing high rated current, low ohmic resistance products. TPU3316DHP wire wound with Mn-Zn material core rugged self-leaded construction composites for low-voltage and large-current DC-DC converter. Available inductance values for the TPU3316DHP are from 0.33 uH to 4.70 uH with rated current up to 20.00 A.
    Download (TPUDHP) PDF (401KB) | P2 (401KB) | P3 (401KB)

  • 5 (TPULF) SMD High Current Inductors Unshielded 0.081~3.304 1.00~1000.00 Token produces a wide and varied range of inductors that are ideal for all portable applications. Other application areas include: telecommunications, consumer and industrial electronics. In order to handle high rated current, SMD inductors must have a low ohmic resistance and minimal losses at high frequencies. Token TPULF7032/7045 surface mount unshielded inductors are designed for high-current with lowest DCR wire-wound inductors.
    Download (TPULF) PDF (382KB)

  • 6 (TPUTX) SMD Power Wirewound Toroidal Inductors Unshielded 0.950~74.000 100.00~10000.00 This TPUTX Range of power toroidal inductor is based on iron powder cores, for good suppression performance at high frequencies, high overload capability, low flux-leakage, economical pricing, and optimized for use as high frequency DC chokes. Token Power Solutions has enhanced its toroidal surface-mount inductor portfolios with the addition of four new ranges (TPUTX-2P/2S/4P/4S) of RoHS compliant components.
    Download (TPUTX) PDF (358KB)

Selecting The Optimum Inductor Technology to Best Match The Performance Requirements

How to Select the Right Inductor for DC-DC Converter

1. Current Rating
Current through a DC-DC converter inductor is always changing throughout the switching cycle and may change from cycle to cycle depending on converter operation, including temporary transients or spikes due to abrupt load or line changes. This peak-to-average ratio makes specification of current ratio difficult. If one takes the highest possible instantaneous peak current as "current rating" for an inductor, the inductor is likely to be spoiled for the application. If one takes the average current as "current rating", the inductor may not perform well when passing the peak current. The way to solve this problem is to look for an inductor that has two current rating factors.

  • The first factor is Isat which to deal with possible core saturation from the peak current.
  • The second factor is Irms which to deal with possible heating that can occur due to the average current.

2. L (Inductance)
In most design procedures, inductance is the first and main parameter to be calculated the desired circuit function. Inductance is calculated to reduce output current ripple and to provide a certain minimum amount of energy storage (or volt-microsecond capacity). Using much greater or much less inductance may force the converter to change between continuous and discontinuous modes of operation. Using less than the calculated inductance causes increased AC ripple on the DC output. Most DC-DC converter applications do not require extremely tight tolerance of inductance which ±20% is suitable for most converter applications.

3. DCR (DC Resistance)
DCR is simply a measure of the characteristic wire used in the inductor and is based strictly on the wire diameter and length. Normally this is specified as a “max” in the catalog but can also be specified as a nominal with a tolerance. Typically to reduce the DCR means having to use larger wire and probably a larger overall size. So optimizing the DCR selection means a trade-off of power efficiency, component size and allowable voltage drop across the component.

4. SRF (Self Resonant Frequency)
The frequency at which the winding self capacitance resonates with the inductance. For most converters, it is best to operate the inductors at frequencies well below the SRF. This is usually shown in the inductor data as a "typical" value.

5. Isat (Saturation Current)
The amount of current flowing through an inductor that causes the inductance to drop due to core saturation.

6. Irms (RMS Current)
In physical meaning, the RMS (Root-Mean-Square) is offten called the effective value or DC-equivalent value of a current is an equivalent of a DC current, which has the same heat dissipation as the real current on any resistor. Irms is the amount of continuous current flowing through an inductor that causes the maximum allowable temperature rise. In this case the data sheets almost always provide a rating based on application of DC or low frequency AC current.


It can be seen that inductors for dc-dc converters can be described by a small number of parameters. However each rating may be thought of as a "5th element" based on one set of operating conditions which may need to be augmented to completely describe expected performance in application conditions.