DNT900C RF Transceiver Module - Equivalent & Substitute Parts

Part Overview

The DNT900C is a General ISM < 1GHz transceiver module manufactured by Murata Electronics, designed for 900MHz wireless communication applications. This surface mount module features U.FL antenna connectivity and operates at 3.3V with FHSS modulation. The product is currently obsolete, making identification of compatible substitute components essential for ongoing system support, design updates, and production continuity.

Substiute Parts

DNT900C

Murata ElectronicsIn Stock: 833DNT900C Datasheet

Current PartRFQ

AC4790LR-1000M

Laird Connectivity Inc.In Stock: 1388AC4790LR-1000M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DNT900C is determined by the following critical parameters:

• RF Family/Standard: General ISM < 1GHz operation
• Frequency: 900MHz band compatibility
• Modulation: FHSS capability
• Power Output: 30dBm minimum
• Supply Voltage: 3.3V compatibility or wider range
• Mounting Type: Surface Mount module format
• Antenna Interface: U.FL or MMCX connector types

The AC4790LR-1000M qualifies as a substitute based on matching RF family, frequency band, power output, supply voltage compatibility, and surface mount packaging. Differences in antenna connector type (MMCX vs. U.FL), data rate, and current consumption require mechanical and electrical integration assessment during design transition.

Parameter Comparison

Engineering Selection Recommendations

The AC4790LR-1000M is an active product from Laird Connectivity Inc. and represents the primary substitute for the obsolete DNT900C. Selection of this substitute requires evaluation of the following factors:

• Data Rate Reduction: The AC4790LR-1000M operates at 115.2kbps versus the DNT900C's 500kbps. Applications requiring higher throughput must assess protocol compatibility and timing requirements.
• Current Consumption: The substitute exhibits lower receive current (30mA vs. 105mA) and transmit current (650mA vs. 1.2A), providing power efficiency benefits.
• Supply Voltage Range: The AC4790LR-1000M accepts 3.3V to 5.5V, offering greater design flexibility compared to the DNT900C's fixed 3.3V requirement.
• Antenna Connector: Mechanical redesign is required to accommodate MMCX connector replacement for the U.FL interface.
• Operating Temperature: The AC4790LR-1000M upper limit is 80°C versus 85°C for the original part. Applications operating near thermal limits require thermal analysis.
• Serial Interface Documentation: The AC4790LR-1000M serial interface specifications are not provided in available data. Interface compatibility must be confirmed with manufacturer documentation.

Frequently Asked Questions (FAQ)

Q: Can the AC4790LR-1000M directly replace the DNT900C without PCB modification?

A: No. The antenna connector type differs (MMCX vs. U.FL), requiring mechanical redesign of the antenna interface. PCB layout modifications may be necessary to accommodate the different connector footprint.

Q: What is the impact of the lower data rate on system performance?

A: The AC4790LR-1000M operates at 115.2kbps compared to the DNT900C's 500kbps. Applications must verify that protocol timing, message throughput, and latency requirements are compatible with the reduced data rate.

Q: Are the serial interfaces compatible between these modules?

A: The DNT900C specifies SPI and UART interfaces. The AC4790LR-1000M serial interface specifications are not provided in the available data. Manufacturer documentation must be consulted to confirm interface compatibility before design transition.

Q: What are the power consumption implications of substitution?

A: The AC4790LR-1000M consumes less current in both receive (30mA vs. 105mA) and transmit (650mA vs. 1.2A) modes. This reduction improves battery life and reduces thermal load, but power supply design must still accommodate the 650mA transmit current requirement.

Q: Is the AC4790LR-1000M suitable for applications requiring operation above 80°C?

A: The AC4790LR-1000M maximum operating temperature is 80°C, compared to 85°C for the DNT900C. Applications with operating temperatures between 80°C and 85°C require thermal analysis and may need alternative solutions.

Q: What supply voltage should be used with the AC4790LR-1000M?

A: The AC4790LR-1000M accepts 3.3V to 5.5V. The DNT900C operates at 3.3V only. Existing 3.3V supplies are compatible, but the wider voltage range allows flexibility in power supply design for new implementations.