NXP Semiconductors OM7692/BFU690F,598

Overview

OM7692/BFU690F,598 from NXP Semiconductors is a silicon germanium (SiGe) NPN microwave transistor optimized as a 2.33 GHz low-noise amplifier (LNA) for the second stage of SDARS (Satellite Digital Audio Service) active antenna receiver chains. It delivers 15.3 dB power gain, 1.47 dB noise figure, +13.9 dBm output P1dB, and operates at 3.3 V with 30 mA collector current in SOT343F package.

For engineers reviewing the OM7692/BFU690F,598 datasheet, OM7692/BFU690F,598 pinout, OM7692/BFU690F,598 application, or OM7692/BFU690F,598 equivalent, this page provides verified RF performance data, exact pin configuration, SDARS-specific LNA implementation context, and validated alternative transistors for 2.3–2.4 GHz satellite radio front-end design.

Technical Context

The OM7692/BFU690F,598 is a discrete SiGe NPN RF transistor designed for high-speed, low-noise amplification in narrowband satellite radio bands. Its dual-emitter SOT343F structure enables superior grounding and thermal stability critical for cascaded LNA stages.

It is characterized at V_CE = 2 V and I_C = 25 mA, delivering 15.7 dB gain and 1.51 dB noise figure at 2.4 GHz, and is specifically validated on an evaluation board for 2.33 GHz operation in the 2320–2332.5 MHz SIRIUS band with matched input/output return loss >10 dB.

Key Specifications

Pinout & Package

The OM7692/BFU690F,598 is housed in a plastic SOT343F surface-mount package with four terminals and dual emitter connections for enhanced RF grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise transistor applications.

Compared with OM7692/BFU690F,598, BFU730F,115 trades SDARS-optimized gain for broader low-noise coverage, while BFP740FESD,115 adds ESD resilience at minor NF/gain cost - both require no PCB footprint change but differ in bias network tuning and matching topology.

Availability

OM7692/BFU690F,598 is available at Aetrix Electronics and suitable for satellite radio antenna modules, GPS/GNSS receivers, and 2.4 GHz wireless infrastructure requiring stable component supply, consistent RF performance, and long-term manufacturability.

Supply support for OM7692/BFU690F,598 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The BFU690 family was developed to deliver cost-effective, high-performance SiGe transistors for mass-market RF front-ends in satellite radio, GPS, and wireless communications - emphasizing low-noise, high-linearity, and ease of integration.

FAQ

What is the primary application focus of the OM7692/BFU690F,598?

The OM7692/BFU690F,598 is specifically engineered as a 2.33 GHz low-noise amplifier transistor for the second stage of Satellite Digital Audio Service (SDARS) active antenna systems. Its performance parameters - including 1.47 dB noise figure and 15.3 dB gain at 2.33 GHz - are validated per NXP Application Note AN11024 for SIRIUS band operation. The OM7692/BFU690F,598 is not a general-purpose RF transistor but a targeted solution for high-sensitivity satellite radio front-ends.

Does the OM7692/BFU690F,598 require external matching components?

Yes, the OM7692/BFU690F,598 is a bare transistor and requires external input/output matching networks to achieve specified RF performance. The AN11024 evaluation board uses discrete inductors (L1–L4) and capacitors (C1–C6) to optimize noise figure and return loss at 2.33 GHz. No internal matching is integrated; all impedance transformation must be implemented on the PCB using the recommended topology and component values from the official reference design.

What is the recommended DC bias condition for OM7692/BFU690F,598 in SDARS applications?

The OM7692/BFU690F,598 is characterized and validated at V_CE = 2 V and I_C = 25 mA, but the AN11024 evaluation board operates it at 3.3 V supply with 30 mA collector current using resistor-based biasing (R1, R2, R3). This 3.3 V/30 mA condition delivers the published 15.3 dB gain and 1.47 dB noise figure at 2.33 GHz and is the recommended setting for SDARS LNA implementations using the OM7692/BFU690F,598.

Is the OM7692/BFU690F,598 pin-compatible with other SOT343F transistors like BFU730F?

Yes, the OM7692/BFU690F,598 shares the identical SOT343F 4-pin package and pinout (Emitter–Base–Emitter–Collector) with BFU730F,115 and BFP740FESD,115. However, direct substitution requires re-optimization of bias resistors and matching networks due to differences in DC current gain (h_FE), transition frequency, and S-parameter behavior - the OM7692/BFU690F,598 is not a drop-in replacement without circuit validation.

Where can I find the official bill of materials and layout guidelines for OM7692/BFU690F,598?

The complete bill of materials, schematic, PCB layout, and stack-up details for the OM7692/BFU690F,598 are published in NXP Application Note AN11024 (Rev. 1, March 2011). This document includes Table 3 (BOM), Figure 3 (circuit diagram), Figure 4 (component layout), and Figure 5 (PCB material stack). All files are available for download from the NXP website under document identifier AN11024 - no third-party sources are required to implement the OM7692/BFU690F,598 correctly.