TDK Electronics · TDK Europe

Inductors for Single Pair Ethernet (SPE)

Headstart for 10BASE-T1L Development

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Single Pair Ethernet (SPE) is a new industry standard to enable connections from the field to the cloud using only one twisted pair of wire, enabling parallel power transfer and using a continuous IP-communication. 

By closely collaboration with major IC companies and industry groups TDK is able to provide the full spectrum of inductors and other passive components needed for implementing 10Base-T1L applications according to IEEE 802.3cg or Ethernet-APL. Our inductors for SPE are specifically developed and tested to work with these new standards. Our product offering combined with the additional support will enable you to develop your application faster. 

Main and Typical Applications

There are different architectures possible defined by the applications power demand and safety requirements. 

The first option is to use 10Base-T1L only for data transmission between control and sensing or acting element therefore only a common mode choke (CMC) or an isolation inductor is needed. To enable transmission of power also called PoDL (Power-over-Data Line) a differential mode choke is needed. If the differential mode inductor consists of two windings only one part is needed in case of a single inductor two components need to be used.  

Product Line-Up

RCM70CGI_pic

RCM70CGI

Common mode choke for suppression of asymmetrical interference

  • Rated inductance 470 µH
  • Rated current 700 mA
  • Rated voltage 80 V DC
  • Operating temperature range -40 to +125 °C
  • Size of 7.1 x 6.0 mm with max height of 4.8 mm
ICI70CGI_pic

ICI70CGI

Isolation inductors for 1:1 coupling of data signal

  • Rated inductance 1 to 2.2 mH
  • Voltage strength up to 2.250 V DC
  • Operating temperature range -40 to +125 °C
  • Size of 7.1 x 6.0 mm with max height of 4.8 mm
  • Stray capacitance of less than 20 pF
PIDs_pic

PID

Differential mode inductors for Power over Data Line (PoDL)

  • Rated inductance with 56 µH, 65 µH or 250 µH per winding 
  • PoDL inductance of 225 µH, 250 µH or 1000 µH 
  • Functional isolation up to 500 V
  • Operating temperature range -40 to +150 °C
  • Sizes from 7.5 x 7.5 up to 15.5 x 15.5 mm
  • Suitable for IEEE 802.3cg and APL power classes

Benefits

Benefits Pic
  • All inductors for 10BASE-T1L applications available from TDK 
  • Highly reliable components 
  • High current capabilities 
  • Low stray capacitance 
  • Suitable for lead-free reflow soldering as referenced in JEDEC J-STD 020E 
  • RoHS-compatible 

Measurement and Simulation Results

Return loss (S DD11)

Curve RL S DD11 Pic


Return loss (SDD11) 

To judge the noise which is coming from the impedance mismatch the Return loss (RL) is the right S-Parameter. SDD11 is the mixed mode 4-Port RL (Return loss) of the logical port 1.

Return loss (S DD22)

Curve RL S DD22 Pic

Return loss (SDD22) 

To judge the noise which is coming from the impedance mismatch the Return loss (RL) is the right S-Parameter. SDD22 is the mixed mode 4-Port RL (Return loss) of the logical port 2.

Longitudinal conversion loss (S CD11)

Curve LCL S CD11 Pic

Longitudinal conversion loss (SCD11)

To judge the symmetry and mode conversion of the signal the longitudinal conversion loss (LCL, SCD11) is the right S-Parameter. SCD11 is the mixed mode 4-Port mode conversion (MC) of the logical port 1. SCD11 describes the conversion from the differential mode signal to the common mode signal at the logical port 1.

Longitudinal conversion loss (S DC11)

Curve RS L DC11 Pic

Longitudinal conversion loss (SDC11)

To judge the symmetry and mode conversion of the signal the longitudinal conversion loss (LCL, SDC11) is the right S-Parameter. SDC11 is the mixed mode 4-Port mode conversion (MC) of the logical port 1. SDC11 describes the conversion from a common mode to the differential mode signal at the logical port 1.

Frequently Asked Questions

What is the difference between PoE, PoE+, SPoE and PoDL?

The original IEEE 802.3af-2003 PoE (Power over Ethernet) standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) on each port. Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable. The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power for Type 2 devices. The 2009 standard prohibits a powered device from using all four pairs for power. Both of these standards have since been incorporated into the IEEE 802.3-2012 publication. 

Looking at ways of increasing the amount of power transmitted, IEEE has defined IEEE 802.3bt 4PPoE in September 2018. The standard introduces two additional power types: up to 55 W (Type 3) and up to 90-100 W (Type 4). Each pair of twisted pairs needs to handle a current of up to 600 mA (Type 3) or 960 mA (Type 4).  

Single-pair Power over Ethernet (SPoE) is also known as Power over Data Lines (PoDL) and defined by the IEEE 802.3bu-2016 amendment. With single-pair Ethernet, power is transmitted in parallel to the data and 10 power classes are defined, ranging from 0.5 to 50 W (at PD). 

What speed and reach is possible with SPE?

SPE is generally describing the use of a twisted pair cable with two lines which can be used in various applications and with different data rates. Data rates start at 10 Mbit per second and can go up to 10 Gbit per second or maybe even faster and will be used in industrial and automotive applications.  

Different standards define data rate, maximum distance, topology and other parameters: 

Name

IEEE-Standard

Transmission speed 

Maximum distance 

10BASE-T1S

802.3cg

10 MBit/s

15 m

10BASE-T1L

802.3cg

10 MBit/s

1000 m

100BASE-T1

802.3bw

100 MBit/s

15 m

100BASE-T1

802.3bp

1000 MBit/s

15 / 40 m 1

MultiGBASE-T1

802.3ch

2.5 / 5 / 10 GBit/s

15 m

1 depending on the cable type 

What is needed to enable power transmission?

The main difficulty in power transmission over a data line is to combine and separate data (AC) and power (DC) on one line without interfering with the data transmission.  

In general, to separate the DC- from the AC-signal two main components are necessary: An inductor and a capacitor. The inductor passes DC-signals and blocks the data communication in the power path while the capacitor blocks the DC-signal and passes the AC-signals in the communication path.  

Finally, the voltage and the current through the components and the line should be monitored and controlled. For this special kind of application, there are power management ICs (PMIC) from available.  

What power classes are available?

IEEE 802.3cg defines 6 power classes 

VPSE max

(VPSE OC max)

30 V

(20 V)

58 V

(40 V)

Class

10

11

12

 13

14

 15

IPI max

92 mA

240 mA

632 mA

231 mA

600 mA

1579 mA

Pclass (min)

(PPD (max))

1.85 W

(1.23 W)

4.8 W

(3.2 W)

12.63 W

(8.4 W)

11.54 W

(7.7 W)

30 W

(20 W)

79 W

(52 W)

VPD min

14 V

14 V

14 V

35 V

35 V

35 V

Cable AWG/length

18/1000 m

14/1000 m

24/300 m

18/1000 m

14/1000 m

24/300 m


Ethernet-APL defines 3 power classes 

VPS max 

VPSE min 

15 V 

9.6 V 

15 V 

11.61 V

50 V 

46 V

Class

A

C

3

IPI min

55.56 mA 

95 mA 

1250 mA

PPS (min) 

(PPD (min))

0.54 W

(0.5 W) 

1.1 W 

(1.0 W) 

57.5 W

(36 W) 

VPL min 

9 V 

10.6 V 

28.8 V 

Cable AWG/length

14...26/up to 1000 m

Inductors for Single-Pair Ethernet at a Glance

Can be used for

Process Industry
Sensor Applications
Traction
Drives
Transportation
Lighting controls

Get data sheets and search

PDF Application Temperature (°C) Power over Ethernet (PoE) Ports Type
new 		10BASE-T1L magnetics module,  Commercial -40…+125 --- --- RCM70CGI
new 		10BASE-T1L magnetics module,  Commercial -40…+125 --- --- ICI70CGI
Commercial --- --- --- PID*-560M, PID*-650M
Commercial --- --- --- PID*-251M
Commercial --- --- --- PIS150H

In order to download up to 20 files together as zip, please mark them with the check box. To start the download, please click the Download button at the end of the list.

  • General technical information
  • EMC services
  • Quality and environment
  • Cautions and warnings
  • Symbols and terms
  • I core chokes: General
  • Ring core chokes with iron powder core: General
  • Sine-wave chokes: General
  • Current-compensated chokes: General

In order to download up to 20 files together as zip, please mark them with the check box. To start the download, please click the Download button at the end of the list.

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