SX1243IULTRT

RF Transmitter Overview

The SX1243IULTRT is an ultra-low-cost, fully integrated RF transmitter manufactured by Semtech Corporation. It supports FHSS, FSK, and OOK modulation schemes across frequency bands of 310MHz to 450MHz, 860MHz to 870MHz, and 902MHz to 928MHz. The device delivers a maximum output power of 10dBm with a data rate up to 100kbps. Operating on a supply voltage of 1.8V to 3.7V, it consumes 17.5mA during transmission. Packaged in an 8-UFDFN (3x2mm) exposed pad format, it functions within a temperature range of -40°C to 85°C.

RF Transmitter Feature Summary

• Fully integrated single-chip transmitter architecture designed for minimal external component requirements.
• Supports multiple frequency bands including sub-GHz ISM ranges for global compatibility.
• Capable of Frequency Hopping Spread Spectrum (FHSS), Gaussian Frequency Shift Keying (FSK), and On-Off Keying (OOK) modulation.

RF Transmitter Applications

• Remote Keyless Entry (RKE) systems
• Security and alarm systems
• Industrial sensor networks

RF Transmitter Procurement Notes

Verify the current lifecycle status of the SX1243IULTRT, as distributor records indicate this product may be obsolete or discontinued. Confirm availability through authorized channels such as Rochester Electronics if standard distribution is unavailable. Ensure that the specific suffix matches the required packaging configuration. Validate RoHS compliance and environmental certifications against the latest manufacturer documentation before integration into new designs.

RF Transmitter Selection Notes

Select the SX1243IULTRT when a low-power, cost-effective solution is required for simple unidirectional data transmission. Its small 8-UFDFN package suits space-constrained PCB layouts. Consider its limited output power of 10dBm for short-range applications. Verify that the supported modulation types align with the receiver's capabilities. This component is suitable for battery-operated devices due to its low current consumption during operation.

RF Transmitter Part Context

The SX1243 belongs to Semtech's family of low-cost wireless transceivers tailored for IoT and industrial markets. Unlike full transceivers, this model focuses exclusively on transmission functionality to reduce complexity and cost. It complements other Semtech products by providing a dedicated transmit path for systems that do not require simultaneous receive operations, simplifying system architecture for specific use cases.

RF Transmitter Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The source indicates the product status as obsolete. Designers should consult Semtech directly for potential end-of-life alternatives or newer generation components that offer similar specifications and pin compatibility.