TO 33 Package

High-speed TO PLUS® headers for Quad applications up to 100G.


SCHOTT TO PLUS® headers on TO 33 footprint are suitable to be used in GPON, XG-PON, 10GEPON, CPRI and 32G Fiber Channel. Single Channel or Quad for use in SFP28 or QSFP28 (CWDM4 or PSM4) transceivers.

Product features

  • Available in 2 x 25-ohm single-ended (lower speed) and 2 x 50-ohm differential (higher speed) versions.
  • Designed for 25G Rx (or 4x25G).
  • 3.4mm in diameter.
  • Size is matched to existing TIAs/PDs available on the market.

Product variants

Modul Speed OSA Type Fiber TO Can Description Function
SFF, SFP, SFP+, QSFP28 10 Gbps
Rx SMF/MMF TO-33, 2 *25-ohm
Separate Vpd and Vcc pin,
high speed, one gnd pin
SFF, SFP, SFP+, QSFP29 28 Gbps Rx SMF/MMF TO-33, 2*50-Ohm,
Differential, 4+1
Separate Vpd and Vcc pin,
high speed, one gnd pin

Product images

TO 33 key image
TO 33 10G version
4 x TO 33 headers placed side-by-side, with the different wavelengths reflected by each mirror respectively. For CWDM4 (CLR4 – Duplex) application.

Product performance

S11 (dB) – Reflection/Return Loss

S11 (dB) – Reflection/Return Loss

S11: Better than -15dB @20GHz for speeds of up to 28 Gbps.

S21 (dB) – Insertion Loss


S21: 3dB bandwidth better than 25GHz.