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HomeProductsRF/IF and RFIDRF Receiver, Transmitter, and Transceiver Finished UnitsFOBLOQF-4T3
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FOBLOQF-4T3 - RF Solutions

Manufacturer Part Number
FOBLOQF-4T3
Manufacturer
RF Solutions
Allelco Part Number
98D-FOBLOQF-4T3
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
36,180 pcs available, New & Original
Parts Description
KEYFOB TRANSMITTER FM 3CH
Package
Bag
Data sheet
FOBLOQF-4T3.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 36180
  • Unit Price: $24.57
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $24.57 $24.57
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

FOBLOQF-4T3 Tech Specifications
RF Solutions - FOBLOQF-4T3 technical specifications, attributes, parameters and parts with similar specifications to RF Solutions - FOBLOQF-4T3

Product Attribute Attribute Value
Manufacturer RF Solutions
Voltage - Supply 2.3V ~ 3.3V
Series KEELOQ®
Sensitivity -
Power - Output -
Package Bag
Modulation or Protocol KEELOQ
Product Attribute Attribute Value
Interface Digital
Function Remote Control System
Frequency 433.92MHz
Features 150m Range
Data Rate (Max) -
Base Product Number FOBLOQF
Applications General Purpose

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
ECCN 5A991G
HTSUS 8525.50.3040

Frequently Asked Questions(FAQ)

What are the key design considerations when integrating the FOBLOQF-4T3 keyfob transmitter into a battery-powered remote control system operating at 433.92 MHz?
The FOBLOQF-4T3 operates within a narrow supply voltage range of 2.3V to 3.3V, making it suitable for single-cell lithium or dual alkaline configurations. Designers must ensure stable voltage regulation under pulsed transmission loads, as current spikes during RF bursts can cause voltage droop and affect KEELOQ® protocol timing. Additionally, the 150m line-of-sight range assumes ideal conditions; real-world deployments with obstructions or interference may require link budget analysis and antenna tuning to maintain reliable communication.
How does the KEELOQ® hopping protocol in the FOBLOQF-4T3 enhance security compared to fixed-code RF transmitters?
The FOBLOQF-4T3 uses KEELOQ® rolling code technology, which generates a unique 32-bit code for each transmission, preventing replay attacks. Unlike static-code transmitters vulnerable to code grabbing, each button press on the FOBLOQF-4T3 produces a pseudorandom sequence derived from a shared secret key and a counter, requiring synchronization between transmitter and receiver. This makes it appropriate for access control systems where security cannot rely solely on RF obscurity.
Can the FOBLOQF-4T3 be used in applications requiring compliance with FCC Part 15 for unlicensed operation at 433.92 MHz?
Yes, the FOBLOQF-4T3 is designed for operation in the 433.92 MHz ISM band and typically complies with FCC Part 15 Subpart C for intentional radiators, provided the end system uses an approved antenna and does not exceed field strength limits. However, full system-level certification is required, as modifications to the matching network or enclosure can affect emissions. The low duty cycle of keyfob transmissions aids in meeting average power restrictions.
What factors influence the effective range of the FOBLOQF-4T3 beyond the stated 150 meters, and how should this be accounted for in system planning?
While the FOBLOQF-4T3 specifies a 150m range, actual performance depends on antenna efficiency, PCB layout, housing material, and environmental RF noise. Foliage, building materials, and co-channel interference can reduce range by 30–70%. Engineers should conduct site surveys and incorporate fade margin (typically 10–20 dB) into link budgets. Using a receiver with high sensitivity and implementing retransmission logic improves reliability in marginal conditions.
How does the digital interface of the FOBLOQF-4T3 simplify integration with microcontroller-based receiver systems?
The FOBLOQF-4T3 outputs a digitally encoded KEELOQ® signal modulated via FM at 433.92 MHz, eliminating the need for analog demodulation. Receivers can decode the signal using standard UART or SPI interfaces with appropriate KEELOQ® decryption ICs or software libraries. This simplifies firmware development and reduces BOM complexity compared to analog ASK/OOK systems requiring custom signal conditioning.
Is the FOBLOQF-4T3 suitable for use in automotive environments, and what environmental factors must be considered?
Although the FOBLOQF-4T3 is not explicitly rated for automotive temperature ranges, its operating voltage and RF performance may degrade under extreme temperatures. Automotive applications often require components rated for -40°C to +85°C or higher. If deployed in such environments, thermal cycling, vibration, and EMC compliance must be validated. The plastic housing and button mechanism may also require additional sealing or mechanical reinforcement.
How does the FOBLOQF-4T3 compare to similar 3-channel 433.92 MHz keyfobs using fixed-code modulation in terms of security and interoperability?
Unlike fixed-code transmitters that repeat the same data pattern, the FOBLOQF-4T3’s KEELOQ® protocol provides cryptographic security and resistance to code sniffing. However, this limits backward compatibility with legacy receivers not supporting rolling codes. Fixed-code alternatives may offer lower cost and simpler pairing but are unsuitable for high-security applications. The FOBLOQF-4T3 is better aligned with modern access systems requiring replay attack protection.
What are the implications of the FOBLOQF-4T3’s RoHS3 compliance and MSL rating for procurement and manufacturing workflows?
The FOBLOQF-4T3 is RoHS3 compliant, ensuring compatibility with global environmental regulations and reducing supply chain risk. Its MSL (Moisture Sensitivity Level) is listed as “Not Applicable,” indicating it is not a moisture-sensitive semiconductor package and does not require dry packing or baking before reflow. This simplifies handling in production environments and reduces the risk of popcorning during assembly.
Can multiple FOBLOQF-4T3 units coexist in the same environment without interference, and how is channel management handled?
The FOBLOQF-4T3 operates on a single 433.92 MHz channel with no frequency agility, so coexistence depends on time-division usage and receiver filtering. While the KEELOQ® rolling code prevents unauthorized decoding, RF collisions can still occur if multiple units transmit simultaneously. Systems should implement receiver-side debouncing and acknowledgment protocols to manage contention, especially in high-density deployments.
What design precautions are necessary to maintain signal integrity when embedding the FOBLOQF-4T3 in a custom enclosure?
The antenna performance of the FOBLOQF-4T3 is highly sensitive to nearby conductive materials and enclosure design. Plastic enclosures should avoid metalized coatings or internal shielding near the antenna trace. Ground planes and battery placement must be evaluated to prevent detuning. A minimum 5–10 mm clearance around the antenna is recommended, and empirical testing with a network analyzer can optimize impedance matching for maximum radiated efficiency.

Parts with Similar Specifications

The three parts on the right have similar specifications to RF Solutions FOBLOQF-4T3

Product Attribute FOBLOQA-4T3 FOBLOQF-4T4 FOBLOQF-4T1 FOBLOQF-4T2
Part Number FOBLOQA-4T3 FOBLOQF-4T4 FOBLOQF-4T1 FOBLOQF-4T2
Manufacturer RF Solutions RF Solutions RF Solutions RF Solutions
Sensitivity - - - -
Data Rate (Max) - - - -
Voltage - Supply - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Frequency - - - -
Power - Output - - - -
Applications - - - -
Series - - - -
Modulation or Protocol - - - -
Interface - - - -
Function - - - -
Features - - - Simultaneous Sampling
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

FOBLOQF-4T3 Datasheet PDF

Download FOBLOQF-4T3 pdf datasheets and RF Solutions documentation for FOBLOQF-4T3 - RF Solutions.

Datasheets
FOBLOQF Remote Control.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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FOBLOQF-4T3 Image

FOBLOQF-4T3

RF Solutions
98D-FOBLOQF-4T3

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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