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TO-39

A miniature header for laser diodes (including VCSEL and DFB lasers), avalanche photodiodes and sensor applications cooling.
About the header

The material of TO-39 header is usually Kovar or CRS coated with nickel and gold for base and pins. Ferrotec-RMT offers thermoelectric sub-assemblies on TO-39 header with 6 or 8 pins. The 8-pin header is the standard and most commonly requested version. TO-39 header with 6 pins is available as a cost-effective solution.

Pins can be standard (cylindrical form) or with flattening ends modified to simplify wire bonding process. The header’s mounting surface is typically 3.2×3.2 mm2, which is enough for mounting various single- and multi-stage TECs types. Ferrotec-RMT offers different solutions with single-stage and multistage TECs.



     6 pin TO-39

     8 pin TO-39
Key features

  • Hermetic Seal: Reliable in harsh environments.
  • Metal Construction (Kovar/CRS): Durable and thermally conductive.
  • Thermal Management: Larger size compared to TO-46 allows for better heat dissipation.
  • Flexible Pinout (3-8 pins): Power, signal, ground and optional TEC.
  • Versatility: Supports various optoelectronic components.


Applications

  • Laser Diodes, used in telecommunications, LiDAR, medical devices and industrial systems.
  • Photodiodes, used in light detection systems, optical sensors and spectroscopy.
  • High-intensity LEDs for illumination, signaling and sensing.
  • Thermoelectric Cooler Integration, used for devices requiring temperature control, such as cooled laser diodes or sensors.