RN42NU-I/RM Microchip Integrated Circuit (Other) In Stock
RN42NU-I/RM is a Class 2 Bluetooth 2.1+EDR module from Microchip operating at 3.3 V supply with HCI communication over USB, and no integrated antenna for designs requiring an external antenna connection. It is TS 16949 screened and supports data rates up to 3 Mbps in Enhanced Data Rate mode. The module targets embedded wireless serial replacement, industrial HID devices, and automotive Bluetooth accessories.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 39
- Lifecycle
- OBSOLETE
- Datasheet
- RN42NU-I/RM Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $54.6200(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of RN42NU-I/RM?
- Class 2 Bluetooth 2.1+EDR module with up to 3 Mbps EDR data rate
- HCI interface over USB for direct host controller integration
- 3.3 V nominal supply (3 V to 3.6 V operating range)
- No integrated antenna — external antenna connection for flexible RF design
- TS 16949 automotive quality screening for industrial and vehicle applications
- Compact microelectronic assembly package (R-XQMA-N35)
- Supports standard Bluetooth profiles for serial port and HID applications
What is RN42NU-I/RM used for?
The RN42NU-I/RM is suited for embedded designs that need a certified Bluetooth 2.1+EDR link with a USB HCI interface, such as industrial barcode scanners, PC-tethered sensor adapters, and automotive diagnostic interfaces where the host processor connects via USB. Its TS 16949 screening qualifies it for automotive infotainment and telematics modules that require Bluetooth for hands-free audio or data exchange with mobile devices. The external antenna architecture also allows engineers to optimize RF performance for specific enclosure geometries by selecting directional or omni-directional antenna types.
What are the specifications of RN42NU-I/RM?
| YTEOL | 0 |
| JESD-30 Code | R-XQMA-N35 |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | MODULE(UNSPEC) |
| Package Shape | RECTANGULAR |
| Package Style | MICROELECTRONIC ASSEMBLY |
| Screening Level | TS 16949 |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 3V |
| Supply Voltage-Nom | 3.3V |
| Surface Mount | YES |
| Terminal Finish | Gold (Au) - with Nickel (Ni) barrier |
| Terminal Form | NO LEAD |
| Terminal Pitch | 1mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | RFSoC |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | 5A992.C |
| HTS Code | 8529.90.22.00 |
Where can I find the RN42NU-I/RM datasheet?
RN42NU-I/RM Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for RN42NU-I/RM?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What Bluetooth version and data rate does the RN42NU-I/RM support?
The RN42NU-I/RM supports Bluetooth 2.1 with Enhanced Data Rate (EDR), achieving link-layer throughput up to 3 Mbps in EDR mode compared to 1 Mbps in Basic Rate. This speed is sufficient for audio streaming, serial data replacement at rates above 1 Mbps, and rapid firmware update transfers over SPP or RFCOMM profiles, covering most embedded wireless serial and HID use cases within the Class 2 range of approximately 10 meters.
How does the USB HCI interface on the RN42NU-I/RM differ from a UART-based Bluetooth module?
HCI over USB uses the standard Host Controller Interface protocol on a USB 2.0 full-speed connection running at 12 Mbps, allowing the host processor's Bluetooth stack to directly manage the radio link, profiles, and connection parameters. A UART-based module typically runs a fixed embedded stack internally and exposes only AT commands. The HCI approach gives the host full stack control and is required for advanced profiles and dual-mode Bluetooth stacks, at the cost of a more complex USB driver implementation.
What supply voltage range does the RN42NU-I/RM require, and how does it fit into a 3.3 V embedded system?
The RN42NU-I/RM operates from 3 V to 3.6 V with a nominal 3.3 V supply, which directly matches the output of standard 3.3 V LDO or buck regulators used in embedded systems. No additional voltage conversion is needed when powered alongside 3.3 V microcontrollers, FPGAs, or SoCs. A decoupling capacitor of 10 µF to 100 µF on the supply pin is recommended to suppress the transient current spikes during Bluetooth radio transmit bursts.
Why does the RN42NU-I/RM not include an integrated antenna, and what are the design implications?
The RN42NU-I/RM omits the integrated antenna to allow designers to connect an external antenna through a U.FL or SMA connector, enabling selection of antenna gain, polarization, and radiation pattern to meet specific range and regulatory requirements. An external 2.4 GHz quarter-wave whip antenna typically provides 2 dBi gain and extends effective Class 2 range to 10 meters or more in open space. This approach also facilitates PCB layout by locating the antenna outside a metal enclosure that would otherwise attenuate the 2.4 GHz signal.
What quality screening standard does the RN42NU-I/RM carry, and which applications require it?
The RN42NU-I/RM is screened to TS 16949, the automotive quality management system standard for component suppliers. This screening is required for parts used in automotive OEM supply chains, including in-vehicle infotainment systems, Bluetooth hands-free units, and telematics control units that must pass supplier audits and demonstrate process control across the 3 V to 3.6 V operating range and the -40°C to 85°C automotive temperature environment.
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| 1+ | $60.6900 | $60.69 |
| 5+ | $57.6600 | $288.30 |
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