
Media Converters
Lantronix E-100BTX-HT Series Hardened Fast Ethernet Media Converters
The E-100BTX-HT Series are unmanaged, extended-temperature media converters that link one 100Base-TX copper port to one 100Base-FX fiber port in enclosures where ambient temperature reaches 65 C.
Overview
About the Lantronix E-100BTX-HT Series
The E-100BTX-HT (ordered as E-100BTX-FX-05 HT models) is the extended-temperature member of the Lantronix stand-alone Fast Ethernet converter line. It converts a 100Base-TX RJ45 port to 100Base-FX fiber and is rated to operate from -25 to 65 C, so it can sit in equipment cabinets, utility closets and other spaces without climate control where heat would push a standard converter out of its rating. It is unmanaged: there is no software to configure, and settings are made with switches and a jumper.
Three models cover the common fiber types. Two use 1300 nm multimode to 2 km with an 11.0 dB link budget, on ST or SC connectors. The third uses 1310 nm single-mode on SC to 20 km with a 16.0 dB budget. DIP switches enable auto-negotiation, pause, link pass through and Far-End-Fault detection, and a jumper block enables auto-MDI/MDIX on the copper port. Automatic link restoration returns the link once a fault clears.
The housing is 3 x 4.7 x 1 in and runs from an external 9 VDC, 1.0 A adapter with a UL and cUL listed wall-mount supply. Mounting options include wall, DIN rail and the RMS19-SA4-02 four-slot shelf. Lantronix rates MTBF at more than 46,768 hours under MIL-HDBK-217F and more than 123,861 hours under Bellcore.
Key capabilities
- -25 to 65 C operation
- Rated to operate where ambient temperature reaches 65 C (149 F) and down to -25 C, at 5% to 95% non-condensing humidity and up to 10,000 ft.
- Multimode or single-mode
- Choose 1300 nm multimode on ST or SC to 2 km, or 1310 nm single-mode SC to 20 km with a 16.0 dB link budget.
- Fault propagation
- Link pass through and Far-End-Fault detection report a broken fiber or copper segment to the connected equipment instead of leaving one side with a false link.
- Unmanaged, switch-configured
- Four DIP switches and one jumper set auto-negotiation, pause, LPT, FEF and auto-MDI/MDIX, with no IP address or software to manage.
- Compact stand-alone housing
- A 3 x 4.7 x 1 in converter that mounts on a wall, a DIN rail with the WMBD-FS bracket, or a 19-inch shelf.
How to choose the right E-100BTX-HT Series part number
All three E-100BTX-HT models have one 100Base-TX RJ45 port and the same -25 to 65 C rating; the suffix sets the fiber port. E-100BTX-FX-05(HT) is 1300 nm multimode with ST connectors to 2 km. E-100BTX-FX-05(SCHT) is the same multimode optic with SC connectors. E-100BTX-FX-05(SMHT) is 1310 nm single-mode with SC connectors to 20 km. Pick multimode for in-building runs on existing multimode cable and SMHT for longer runs or single-mode plant, and match the far-end connector type.
Configure & order
Find your E-100BTX-HT Series part number
Every orderable E-100BTX-HT Series configuration, filtered by the specs that actually differ between them. Pick what you need on the left and the matching part numbers appear here.
Complete the deployment
Accessories, renewals & add-ons
Everything sold for the E-100BTX-HT Series, organized by what it does — power, mounting & enclosures, chassis & shelves— each with why you'd add it.
Power
1 item
SPS-2460-SA
SPS-2460-SA
Stand-alone wide input external power supply for all Lantronix stand-alone media converters and some chassis.
$248.00
Ships on backorder
Mounting & enclosures
2 items
WMBD-FS
WMBD-FS
3.1” [79 mm] DIN Rail Mount Bracket (flat, small). It fits Stand-Alone Converters that are 3″ [76 mm] wide.
$16.00
Ships on backorder

WMBL
WMBL
4″ [102 mm] wall-mount bracket kit for stand-alone converters size 4.8″ [122 mm] and 6.5″ [165 mm]. It is listed as a compatible accessory for the E-100BTX Series.
$16.00
2 in stock
Chassis & shelves
3 items
WMBD
WMBD
5″ [127 mm] DIN Rail Mount Bracket for all Stand-Alone Converters and 1- or 2-Slot ION Chassis.
$11.00
Ships on backorder

WMBV
WMBV
5″ [127 mm] vertical mount for all Stand-Alone Converters and 1- or 2-slot ION Chassis. It supports wall-mountable installations and is supplied as a bulk package quantity of 1.
$22.00
Ships on backorder

RMS19-SA4-02
RMS19-SA4-02
19-inch, 1U rack-mount shelf for up to 4 stand-alone media converters. It includes 4 converter mounting brackets and 3 slot blanks.
$177.00
3 in stock
Compatibility taken from the Lantronix part-number tables for the E-100BTX-HT Series. Don't see what you need? Request a quote — we can source the full Lantronix catalog.
Where the E-100BTX-HT Series is used
- Fiber links in non-climate-controlled equipment cabinets
- Extending Fast Ethernet to devices in hot utility spaces
- Single-mode runs up to 20 km between remote enclosures
- Converting copper to fiber in industrial control panels
E-100BTX-HT Series datasheets & documentation
E-100BTX-HT Series FAQ
What temperature range is the E-100BTX-HT rated for?
The E-100BTX-HT operates from -25 to 65 C (up to 149 F) at 5% to 95% non-condensing humidity and altitudes to 10,000 ft. Lantronix designed it for environments where ambient temperature can rise as high as 65 C.
Which E-100BTX-HT model do I need for single-mode fiber?
Use E-100BTX-FX-05(SMHT). It has a 1310 nm single-mode optic with SC connectors, reaches 20 km and has a 16.0 dB link budget. The (HT) and (SCHT) models are 1300 nm multimode for runs up to 2 km.
Is the E-100BTX-HT a managed media converter?
No. It is unmanaged. Auto-negotiation, pause transmit, link pass through and Far-End-Fault are set with four DIP switches, and auto-MDI/MDIX is enabled with a jumper block.
What power supply does the E-100BTX-HT use?
It uses an external AC/DC adapter with 120-240 VAC input and 9 VDC, 1.0 A output. Lantronix lists the wall-mount power supply as UL and cUL listed.



