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Coilcraft CPS
3D Model Datasheet

1812TRX Series

Compact SMT Ethernet Isolation Transformer

RoHS compliant AEC-Q flag
Coilcraft’s 1812TRX Ethernet isolation transformer features a fully automated construction, not only reducing cost but also increasing reliability. Its compact surface mount package measures just 4.5 x 3.2 x 3.1 mm, significantly smaller than traditional hand wound toroidal transformers. The 1812TRX is AEC-Q200 (–40°C to +125°C) qualified, making it an ideal choice for automotive and other harsh-environment applications. It also meets Gigabit Ethernet 10/100/1000BASE-T1 and Power over Ethernet standards per IEEE 802.3, ensuring seamless integration into a variety of network environments.
  • Complies with IEEE 802.3 Standards
  • Chip-style in a compact SMT package: 4.5 x 3.2 x 3.1 mm
  • Fully automated for cost reduction and reliability
  • AEC-Q200 Grade 1 (–40°C to +125°C)

Buy Now:
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Count Unit price
1 $2.50
100 $2.45
300 $1.84
600 $1.10
1200 $0.86

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
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Specifications

Electrical specifications at 25°C. Measurements are referenced to 50 Ohms.

Part number 1
(Hover for schematics)
L min per winding (µH) 2 Test frequency
(kHz) 		DCR max (Ω) Current
rating (mA) 		Insertion
loss (db) 		Bandwidth (MHz) Isolation
Voltage (Vrms) 3 		Turns Ratio
1812TRX-S124R_ 120 100 2.5 430 0.15 0.1 — 1100 1500 1 : 1
1812TRX-S254R_ 250 100 3.8 350 0.35 0.1 — 820 1500 1 : 1
Notes
  1. When ordering, please specify packaging code: e.g. 1812TRX-S254RC
  2. Inductance is per winding, measured at 100 kHz, 0.1 Vrms, 0 Adc using an Agilent/HP 4263B LCR meter and a Coilcraft CCF 1113 fixture.
  3. 1500 Vrms, one minute isolation (hipot) between primary to secondary.
IDC max per the center tap is the current required to increase the part temperature 15°C from ambient 25°C.

Termination:

  • R = RoHS compliant matte tin over nickel over silver-platinum-glass frit

Packaging:

  • C = 7″ machine-ready reel. EIA-481 embossed plastic tape (600 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape. Factory order only, not stocked (2200 parts per full reel).
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
–40°C to +125°C with Irms current
Storage temperature range:
Component: –40°C to +125°C
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+140°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
See FIT/MTBF Calculations

Performance curves

Insertion Loss

Insertion Loss

Return Loss

Return Loss

Schematics

1812trxs.gif

Physical characteristics

1812trxd.gif

dims_inches_mm.gif

Tape and Reel specification

tapereel_pl.gif

 
Parts per reel* Reel dimensions (mm) Tape dimensions (mm) Orientation
7" (178 mm) 13" (330 mm) A B C D E W P Po P1 H T part_or_i.gif
600 2200* 178/330 60/100 13 18,4 12,4 12 8 4 2 3,25 0,25
* Special order

General specification

Core Material:
Ferrite
Weight:
120 – 130 mg
Packaging:
600/7″ reel; 2200/13″ reel Plastic tape: 12 mm wide, 0.25 mm thick, 8 mm pocket spacing, 3.25 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.