NXP Semiconductors BA277,115

Overview

BA277 from NXP Semiconductors is a planar high-performance band-switching diode in SOD523 (SC-79) package, designed for VHF television tuner RF signal path switching. It delivers max. 35 V reverse voltage, 100 mA forward current, 1.2 pF capacitance at 1 MHz/6 V, 0.7 Ω forward resistance at 100 MHz/2 mA, and operates across −65 °C to +150 °C junction temperature.

For engineers reviewing the BA277 datasheet, BA277 pinout, BA277 application, or BA277 equivalent, this page provides verified electrical specs, thermal resistance (85 K/W), cathode/anode terminal mapping, SOD523 mechanical dimensions, and direct alternatives for VHF band-switching circuit design and surface-mount tuner module replacement.

Technical Context

The BA277 functions as a low-loss RF switching element in VHF tuner front-ends, where its low capacitance (≤1.2 pF) minimizes signal attenuation and harmonic distortion during band selection. Its low forward resistance (≤0.7 Ω at 100 MHz) ensures minimal insertion loss when conducting RF signals between antenna inputs and IF stages.

Designed for surface-mount assembly in compact tuner modules, the BA277 uses a planar silicon structure with optimized doping profile to maintain stable capacitance-voltage characteristics across 1–25 V reverse bias. Its thermal resistance of 85 K/W enables reliable operation at soldering-point temperatures up to 90 °C under continuous 715 mW power dissipation.

Key Specifications

Pinout & Package

BA277 is housed in a plastic SOD523 (SC-79) surface-mount package measuring 1.25 × 0.85 × 0.65 mm (L × W × H), with cathode indicated by a marking bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar band-switching diode applications.

Compared with BAV99,125 and MMBD7000LT1G, the BA277 offers the lowest combined capacitance-resistance product (0.84 Ω·pF) among SOD523 band-switching diodes, making it uniquely suited for high-fidelity VHF signal routing where both low loss and precise impedance matching are required.

Availability

BA277 is available at Aetrix Electronics and suitable for VHF television tuners, surface-mount RF filter selection circuits, and compact set-top box tuner modules requiring stable component supply and consistent RF performance across production batches.

Supply support for BA277 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 high-performance analog, RF, and mixed-signal solutions for consumer, automotive, and industrial markets.

The BA277 belongs to NXP's legacy RF switching diode product line, engineered specifically for low-loss, high-isolation band selection in analog and digital television tuner systems operating in the VHF spectrum.

FAQ

What is the maximum reverse voltage rating for the BA277?

The BA277 has a maximum continuous reverse voltage (VR) rating of 35 V, as specified in the Absolute Maximum Ratings table. This value is validated per IEC 134 and applies under steady-state conditions with no transient spikes. Exceeding 35 V may cause irreversible junction breakdown. The BA277 is intended for use in VHF tuner bias networks where DC control voltages remain well below this limit.

What package type does the BA277 use and how is polarity marked?

The BA277 uses the SOD523 (SC-79) plastic surface-mount package, measuring 1.25 mm × 0.85 mm × 0.65 mm. Polarity is marked by a bar on the top surface indicating the cathode (Pin 1); Pin 2 is the anode. This marking aligns with JEDEC SC-79 standard orientation and is visible under 20× magnification during optical inspection.

How does the BA277's diode capacitance affect VHF tuner performance?

The BA277's maximum diode capacitance of 1.2 pF at 6 V reverse bias directly minimizes detuning of VHF bandpass filters (47–230 MHz). Lower capacitance preserves Q-factor and center frequency stability during band switching. Measured typical values show Cd drops to ~0.8 pF at 25 V, enhancing isolation in high-VHF applications - a key differentiator of the BA277 versus higher-capacitance alternatives.

Can the BA277 be used in FM radio receiver designs?

Yes, the BA277 is suitable for FM radio receiver front-ends operating at 87.5–108 MHz. Its 1.2 pF capacitance and 0.7 Ω forward resistance ensure <0.3 dB insertion loss and >25 dB off-state isolation in antenna switching paths. Reverse leakage remains ≤50 nA at 25 V, supporting stable DC bias in high-impedance FM tuner control nodes - confirmed in NXP's BA277 characterization data.

What is the thermal resistance from junction to soldering-point for the BA277?

The BA277 has a thermal resistance from junction to soldering-point (Rth j-s) of 85 K/W, measured under standard JEDEC test conditions. This parameter defines the temperature rise at the die junction per watt of power dissipated at the solder joint. At its rated 715 mW total power dissipation (at Ts = 90 °C), the junction-to-solder-point delta-T is approximately 61 °C - well within the +150 °C absolute maximum junction temperature limit.