NXP Semiconductors BB208-02,135

Overview

BB208-02 from NXP Semiconductors is a low-voltage planar variable capacitance diode (varactor) in an ultra-small SOD523 (SC-79) surface-mount package, designed for tuning RF circuits. It delivers Cd = 21.5 pF at 1 V reverse bias, 4.9 pF at 7.5 V, with series resistance rs = 0.35 Ω (typ) at 100 MHz and VR(max) = 10 V - enabling precise frequency control in compact VCOs.

For engineers reviewing the BB208-02 datasheet, BB208-02 pinout, BB208-02 application, or BB208-02 equivalent, key selection criteria include its high capacitance ratio (Cd(1V)/Cd(7.5V) = 4.4), excellent CV linearity, low series resistance, and SOD523 footprint compatibility with space-constrained RF front-end designs.

Technical Context

The BB208-02 operates as a voltage-dependent capacitor where reverse-bias voltage directly modulates junction capacitance via depletion region width change. Its planar silicon structure ensures stable CV characteristics across temperature and bias, with typical TCd < 100 ppm/K above 2 V.

Designed for low-noise, high-Q tuning, it supports operation up to 125 °C junction temperature and maintains sub-10 nA reverse leakage at 10 V/25 °C. The cathode-anode polarity and marking bar orientation are standardized per SOD523 mechanical outline, ensuring consistent PCB layout integration.

Key Specifications

Pinout & Package

SOD523 (SC-79) ultra-small plastic surface-mount package: 1.25 mm × 0.85 mm × 0.55 mm body, cathode marked by bar, 2-terminal configuration optimized for high-frequency parasitic minimization.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar varactor diode applications.

Compared with BBY52-02W and MV2102, the BB208-02 offers optimal balance of tuning range, low-loss performance, and SOD523 compatibility for space-constrained 1–3 GHz VCOs - making it the preferred choice when layout reuse and 10 V compliance are primary constraints.

Availability

BB208-02 is available at Aetrix Electronics and suitable for RF transceiver design, precision oscillator manufacturing, and 5G infrastructure development requiring stable component supply and full traceability.

Supply support for BB208-02 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 communication markets.

The BB208-02 belongs to NXP's discrete RF varactor family, engineered specifically for high-linearity, low-loss voltage-controlled tuning in compact wireless infrastructure and timing modules.

FAQ

What is the maximum reverse voltage rating for BB208-02?

The BB208-02 has an absolute maximum continuous reverse voltage (VR) rating of 10 V, as specified in Table 5 of the NXP datasheet. Operation beyond this voltage risks permanent junction damage. For reliable long-term performance, design bias networks to limit reverse voltage to ≤9 V under all operating conditions, including transients and temperature extremes.

How does BB208-02 differ from BB208-03 in terms of electrical performance?

The BB208-02 and BB208-03 share identical electrical characteristics - including Cd(1V) = 21.5 pF, Cd(7.5V) = 4.9 pF, rs = 0.35 Ω, and VR(max) = 10 V - per Tables 3 and 6 of the NXP datasheet. Their sole difference is package: BB208-02 uses SOD523, while BB208-03 uses SOD323. No electrical parameter variation is documented between the two variants.

Is BB208-02 suitable for automotive applications?

No. The BB208-02 is not automotive-qualified. Section 9.3 of the NXP datasheet explicitly states that unless designated as automotive qualified, the product is unsuitable for automotive use. It lacks AEC-Q200 stress testing, automotive-grade reliability screening, and extended-temperature qualification beyond its rated −55 °C to +125 °C operating range.

What is the typical capacitance temperature coefficient (TCd) of BB208-02?

Per Figure 3 in the NXP datasheet, the BB208-02 exhibits a typical capacitance temperature coefficient (TCd) of approximately −100 ppm/K at VR = 4 V and −50 ppm/K at VR = 7.5 V. This negative TCd partially compensates for positive TC of inductors in VCO tanks, improving overall frequency stability across temperature.

Can BB208-02 be used in series or parallel configurations for extended tuning range?

Yes - the BB208-02 can be configured in series or parallel to modify effective capacitance and tuning slope. In series, total capacitance decreases and voltage rating increases; in parallel, capacitance sums linearly. However, series connection introduces additional series resistance, degrading Q. Layout symmetry and thermal coupling must be controlled to avoid mismatch-induced distortion.