NXP Semiconductors BA591115

Overview

BA591115 from NXP Semiconductors is a planar high-performance band-switching diode in the SOD323 (SC-76) surface-mount package, designed for low-loss VHF television tuner applications. It delivers maximum diode capacitance of 1.05 pF at 1 MHz and 1 V reverse bias, forward resistance as low as 0.36 Ω at 10 mA, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the BA591115 datasheet, BA591115 pinout, BA591115 application, or BA591115 equivalent, key selection criteria include its sub-1 pF capacitance at 1 V VR, <0.7 Ω forward resistance, 35 V reverse voltage rating, 100 mA continuous forward current capability, and SOD323 footprint compatibility with space-constrained RF front-end designs.

Technical Context

The BA591115 operates as a voltage-controlled RF switch element, leveraging low junction capacitance and minimal series inductance (2 nH typical) to enable efficient band selection in VHF tuners. Its planar construction and AEC-Q101 qualification confirm suitability for automotive infotainment systems requiring stable RF performance across temperature.

Reverse resistance exceeds 100 kΩ at 1 V and 100 MHz, supporting high isolation between antenna bands. The device exhibits predictable Cd vs. VR and rD vs. IF behavior per Figures 1 and 2, enabling accurate impedance matching in discrete switching networks without active control circuitry.

Key Specifications

Pinout & Package

The BA591115 is housed in the SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.35 mm body, 0.45 mm height, cathode marked by a 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 BAV99W and MMBD7000, the BA591115 provides superior VHF band-switching performance through its lower capacitance and forward resistance, plus automotive-grade qualification-making it the preferred choice for tuner modules where signal integrity and environmental robustness are critical.

Availability

BA591115 is available at Aetrix Electronics and suitable for VHF television tuners, automotive infotainment antenna diversity systems, and portable radio receiver band selection requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for BA591115 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 BA591115 belongs to NXP's high-frequency discrete diode product line, engineered specifically for low-loss RF switching in broadcast and automotive tuner systems where precise capacitance control and thermal reliability are essential.

FAQ

What is the maximum reverse voltage rating for BA591115?

The BA591115 has a maximum continuous reverse voltage (VR) rating of 35 V, as specified in Table 4 of the official NXP datasheet Rev. 4. This rating applies under standard operating conditions and must not be exceeded to prevent junction breakdown. The BA591115 is intended for use in bias-controlled RF switching applications where reverse bias remains within this limit.

Is BA591115 qualified for automotive applications?

Yes, the BA591115 is AEC-Q101 qualified, confirming compliance with stress test requirements for discrete semiconductors in automotive environments. This qualification covers temperature cycling, humidity, mechanical shock, and other reliability tests defined in the AEC standard. The BA591115 is therefore approved for use in automotive infotainment tuners and antenna diversity modules.

What is the typical diode capacitance of BA591115 at 3 V reverse bias?

The BA591115 exhibits a typical diode capacitance (Cd) of 0.65–0.9 pF at VR = 3 V and f = 1 MHz, per Table 6 in the NXP datasheet. This low, tightly controlled capacitance enables precise band-select filtering in VHF television tuners and supports high isolation between adjacent RF channels without external compensation.

Does BA591115 have a marked cathode terminal?

Yes, the BA591115 features a cathode marking bar on the top surface of the SOD323 package, as shown in Figure 3 and confirmed in Table 1 (Pinning information). Pin 1 is the cathode, and the bar aligns with this terminal-ensuring unambiguous orientation during automated placement and visual inspection in production.

What is the thermal resistance from junction to solder point for BA591115?

The BA591115 has a typical thermal resistance from junction to solder point (Rth(j-sp)) of 120 K/W, as listed in Table 5 of the NXP datasheet. This value supports safe operation at up to 500 mW total power dissipation when the solder point temperature is maintained at or below 90 °C, making it suitable for densely packed RF PCB layouts.