SM51108PEL LAN 10/100 Base-Tx VoIP Transformer (PoE) Modules - Obsolete - Not recommended for new designs

Aug 29, 2026

SM51108PEL LAN 10/100 Base-Tx VoIP Transformer (PoE) Modules provide compliant operation with IEEE802.3 and support 10/100 Base-Tx plus Power over Ethernet. The document lists electrical parameters such as turns ratio, leakage inductance, capacitance, DCR, insertion loss, return loss, cross talk, and DCMRR, along with insulation test voltage and operating/storage temperature ranges. It also specifies environmental and moisture sensitivity levels, packaging via tape-and-reel (600 pcs./reel), soldering profile requirements, and ordering/model construction codes, while noting the series is available but obsolete and not recommended for new designs.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

Electrical Specifications

Environmental and Operating Conditions

Packaging and Ordering

How To Order

Product Dimensions and Soldering Profile

Soldering Profile

Legal Disclaimer Notice

Features n Compliant with IEEE802 .3 standards n Designed for 10/100 Base-Tx and PoE n RoHS compliant* This series is currently available but not recommended for new designs. The newer model SM13126PEL is recommended. SM51108PEL LAN 10/100 Base-Tx VoIP Transformer (PoE) Modules Electrical Specifications @ 25 °C Turns Ratio (±3 %) ................... 1CT:1CTOCL (@100 kHz, 0.1 V, 8 mA, DC Bias) 350 µH min. Leakage Inductance (@100 kHz, 0.1 V with 1-2-3-6-7-8 Short) 9-11 = 14-16 .................... 0.5 µH max. Cw/w @ 100 kHz, 0.1 V 35 pF max. DCR 1-3 = 6-8........................ 0.8 ohm max. 9-11 = 14-16 .................. 1.1 ohm max. Insertion Loss 1-100 MHz.......................-1.2 dB max. Return Loss (@ 100 Ohms) 1-30 MHz...........................-16 dB min. 40 MHz..............................-14 dB min. 50 MHz..............................-13 dB min. 60-80 MHz.........................-12 dB min. Cross Talk 60 MHz..............................-40 dB min. 100 MHz............................-35 dB min. DCMRR 30 MHz..............................-43 dB min. 60 MHz..............................-37 dB min. 100 MHz............................-33 dB min. PoE Current...................... Up to 350 mAHi-Pot Test .............................1500 Vrms Operating Temperature Range..................................-40 °C to +85 °C Storage Temperature Range................................-25 °C to +125 °C Environmental Specifications Moisture Sensitivity Level ..................... 1 ESD Classification (HBM) ................. N/A Packaging Specifications Tape & Reel ....................... 600 pcs./reel How To Order SM51108 P E L Model Construction ~~ ~~P = Potted Packaging ~~ ~~E = Tape and Reel (600 pcs./reel) Termination ~~ ~~L = Tin (RoHS Compliant) Product Dimensions PIN 1 DOT 1.27 (0.050) 0.46 (0.018) 0.70 ± 0.15 (0.028 ± 0.006) Electrical Schematic Asia-Pacific: Tel: +886-2 2562-4117 • Email: [asiacus@bourns.com](asiacus@bourns.com) EMEA: Tel: +36 88 885 877 • Email: [eurocus@bourns.com](eurocus@bourns.com) The Americas: Tel: +1-951 781-5500 • Email: [americus@bourns.com](americus@bourns.com)[ ](americus@bourns.com)[www.bourns.com](www.bourns.com) WARNING [Cancer and Reproductive Harm-](Cancer and Reproductive Harm-www.P65Warnings.ca.gov)[www.P65Warnings.ca.gov](Cancer and Reproductive Harm-www.P65Warnings.ca.gov) *RoHS Directive 2015/863, Mar 31, 2015 and Annex. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at [www.bourns.com/docs/legal/disclaimer.pdf](www.bourns.com/docs/legal/disclaimer.pdf). SM51108PEL LAN 10/100 Base-Tx VoIP Transformer (PoE) Modules Soldering Profile Temperature TP TL TS MAX. TS MIN. 25 °C | tp | | | --- | --- | |

PREHEAT

| | t 25 °C TO PEAK 8 MINS./248 .9 °C Time • Ramp-up rate = 3 °C/sec. max. • Ramp-down rate = 6 °C/sec. max. • TL = 217 °C • tL = 60-150 sec. • Tp = 250 ±3 °C • Time within 5 °C of actual Peak Temp (tp)2 = 20~40 sec. • Ts min = 150 °C • Ts max = 200 °C • Ts min to Ts max = 60-180 sec. , 25 °C to Peak Temperature = 8 min. max. Refer to IPC/JEDEC J-STD020D standard. Packaging Specifications DIMENSIONS: MM (INCHES) USER DIRECTION OF FEED QUANTITY: 600 PCS. PER REEL REV. 08/19 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at [www.bourns.com/docs/legal/disclaimer.pdf](www.bourns.com/docs/legal/disclaimer.pdf). Legal Disclaimer Notice This legal

FAQs

What standards and operating modes are supported by the SM51108PEL module?

It is compliant with IEEE802.3 standards and designed for 10/100 Base-Tx operation with Power over Ethernet (PoE).

What key electrical performance parameters are specified?

The document provides turns ratio, leakage inductance, capacitance, DCR, insertion loss, return loss, cross talk, and DCMRR, including limits across multiple frequency ranges.

Is the SM51108PEL recommended for new designs?

No. The document states the series is currently available but not recommended for new designs, and recommends the newer model SM13126PEL.

Aug 29, 2026

Upload by Oliver Hayes