ACCESS Automation UNI433ETTX1H Code-Hopping 433MHz Module - Specs & Local Availability

Overview

The ACCESS Automation UNI433ETTX1H is a compact 433MHz transmitter module designed for remote keyfob and gate/garage door systems using code-hopping (rolling-code) security. It is commonly used by installers, security technicians, and DIY home-automation enthusiasts who need a transmit-only module that pairs with compatible receivers and supported remote-control ecosystems. This page summarises key specifications, compatibility notes, and practical procurement options within South Africa.

Key specification callouts

• Frequency: 433.92 MHz (typical ISM-band operation)
• Modulation: ASK/OOK compatible with code-hopping (rolling-code) protocols
• Form factor: PCB-mounted transmitter module for integration into keyfobs or control boards
• Power: low-voltage operation (check module marking/datasheet for exact Vcc and current draw)
• Security: uses a hopping-code algorithm to reduce replay attack risk (receiver pairing required)

Why choose a code-hopping 433MHz module?

Code-hopping modules like the UNI433ETTX1H provide enhanced security compared with fixed-code transmitters by changing the transmitted code on each activation. For access automation-gates, roller doors, and barrier systems-this reduces the chance of cloning or replay attacks when used with a matching rolling-code receiver. Installers appreciate the compact footprint and low-power operation for battery-powered remotes.

Local stock and procurement notes

Availability and lead times for niche access-control modules can vary. Check Communica’s stock listings and branch collection options for Samrand, Pretoria CBD, or Cape Town to reduce delivery time. For branch pickup and trading hours, view the Branches & Trading Hours page: Branches & Trading Hours. To browse related receiver modules, antennas, and prototyping accessories, use the Collections page: Collections or the full product index: All Products.

Compatibility guidance

Not all 433MHz modules interoperate out of the box. Compatibility depends on the hopping algorithm, synchronization method, and encoding format. When integrating the UNI433ETTX1H into an installation, verify the receiver family or consult the receiver datasheet to confirm supported hopping protocols and pairing procedures. If you need to match a branded receiver or replacement remote, search by brand at the Shop by Brand index: Shop by Brand.

Specification table (quick comparison)

Installation & Integration Tips

Follow these practical steps when fitting the UNI433ETTX1H into a remote or control board. Confirm supply voltage and decoupling - many transmitter modules are sensitive to power transients. Use a small ceramic bypass capacitor close to Vcc and route the antenna clear of large copper areas to preserve range.

Wiring diagram (ASCII)

VCC ---+----[Vcc pin]
       | 
      === 10uF
       |          ANT ---//\--- antenna
GND ---+----[GND pin]
TX signal --> [DATA pin]

If integrating with microcontrollers, drive the DATA pin with the correct timing and logic levels specified by the module datasheet. For battery-powered remotes, choose low self-discharge cells and consider a MOSFET or transistor driver if the module needs short high-current pulses for transmission bursts.

Accessory bundles and complementary parts

• Antenna assemblies and pigtails for improved range
• Battery holders, CR2032/AAA/AA options depending on remote design
• Matching receivers, programming tools, and enclosures

You can assemble these accessories from Communica’s prototyping and enclosures categories to build or repair remotes. Browse prototyping and enclosures via Collections: Collections. For procurement policies, VAT invoices, and account quotes useful to installers and procurement teams, review Communica’s About Us and ordering options here: About Us.

Compatibility checklist before purchase

• Confirm receiver supports 433.92MHz code-hopping protocol used by your system
• Verify Vcc and idle/transmit current on the module datasheet
• Check mechanical fit and antenna clearance within the chosen enclosure
• Plan for programming/pairing steps with the receiver - some systems require sequence timing

Ordering & local delivery options

When sourcing the UNI433ETTX1H, check Communica’s Samrand warehouse stock to reduce lead time, or choose branch collection in Pretoria CBD or Cape Town. Use the product index to compare similar transmitter modules and receivers before ordering: comparison of UNI433ETTX1H with other 433MHz modules. For larger installer orders, consider requesting a quote to include VAT invoices and account terms.

Common troubleshooting

If range is poor, first check antenna connection and orientation, then verify supply decoupling and battery state. If pairing fails, confirm both transmitter and receiver are operating on the same hopping algorithm and that the receiver has been reset to accept new remotes. For persistent issues, consult product datasheets or seek technical support from experienced installers. See Troubleshooting Common Issues with Magnetic Locks (South Africa) for a focused guide.

Next steps

Compare specs and check stock at Communica to confirm availability, then assemble the recommended accessory bundle (antenna, battery holder, enclosure) for a complete remote solution. For installer-friendly ordering, check branch hours and pickup details: Branches & Trading Hours.

Sources

• Code-hopping and rolling-code overview - RF Wireless World
• ISM band allocations and background - ETSI (reference search)
• Communica company and ordering information