NXP Semiconductors BB208-02,115

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 applications requiring high CV linearity and low series resistance. It delivers Cd = 21.5 pF at 1 V reverse bias, 4.9 pF at 7.5 V, with rs = 0.35 Ω typical at 100 MHz and VR(max) = 10 V - enabling precise frequency control in compact RF oscillators.

For engineers reviewing the BB208-02 datasheet, BB208-02 pinout, BB208-02 application, or BB208-02 equivalent, key selection criteria include capacitance ratio (Cd(1V)/Cd(7.5V) = 4.4), junction temperature range (−55 °C to +125 °C), reverse leakage (≤10 nA at 10 V, 25 °C), and SOD523 mechanical compatibility in space-constrained VCO layouts.

Technical Context

The BB208-02 operates as a voltage-controlled capacitor where reverse-bias voltage modulates junction depletion width, directly altering capacitance. Its planar silicon structure ensures stable CV characteristics across temperature, with a measured capacitance temperature coefficient of −100 ppm/K at VR = 1 V.

Designed for low-noise RF tuning, it exhibits minimal series resistance (rs ≤ 0.5 Ω) and tight capacitance tolerance (±10% at VR = 1 V), supporting stable phase noise performance in VCOs and VCXOs without external compensation networks.

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 on top surface, 2-terminal configuration optimized for high-frequency layout with minimal parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BBY52-02W and SMV2023-011LF, the BB208-02 offers the optimal balance of tuning range (4.4:1), ultra-compact SOD523 fit, and proven stability in production TCXO modules - making it preferred for space-constrained, wide-tuning industrial timing systems.

Availability

BB208-02 is available at Aetrix Electronics and suitable for voltage-controlled oscillators, VCXO/TCXO modules, and RF front-end impedance tuning requiring stable component supply, consistent parametric performance, and long-term manufacturability.

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 IoT applications.

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

FAQ

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

The BB208-02 has a continuous reverse voltage rating of 10 V, per IEC 60134 Absolute Maximum Ratings. Exceeding this voltage risks permanent junction damage. For reliable operation in VCO bias networks, design with ≤8 V reverse bias to maintain margin against transients and temperature-induced leakage rise.

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

The BB208-02 and BB208-03 share identical electrical specifications - including Cd values, rs, IR, and temperature coefficients - differing only in package: BB208-02 uses SOD523 (SC-79), while BB208-03 uses SOD323 (SC-76). No electrical performance trade-offs exist between the two variants.

Is BB208-02 suitable for automotive applications?

No - the BB208-02 is not automotive-qualified. Per NXP's legal disclaimers, it is not tested or warranted for automotive use. For AEC-Q200 compliance, alternative varactors such as the PNV200E must be selected; BB208-02 remains appropriate for industrial, telecom, and consumer RF modules.

What is the typical series resistance of BB208-02 and why does it matter?

The BB208-02 has a typical series resistance (rs) of 0.35 Ω at 100 MHz and VR = 3 V. This low rs preserves high Q-factor in resonant tank circuits, directly improving VCO phase noise and minimizing frequency pulling in sensitive receiver front ends.

Can BB208-02 be used in DC-coupled tuning circuits?

No - BB208-02 must operate under reverse bias only. Forward conduction causes irreversible damage. All tuning circuits must ensure the anode is always at higher DC potential than the cathode. Use blocking capacitors or dedicated bias tees to isolate RF paths from DC control voltage sources in BB208-02 implementations.