NXP Semiconductors BB202,135

Overview

BB202,135 from NXP Semiconductors is a low-voltage variable capacitance diode (varactor) designed for electronic tuning in FM radio and voltage-controlled oscillators. It delivers C_0.2V = 30.5 pF, C_2.3V = 9.5 pF, capacitance ratio ≥2.5, series resistance ≤0.6 Ω at 100 MHz/30 pF, and operates up to 6 V reverse voltage in an ultra-small SOD523 package.

For engineers reviewing the BB202,135 datasheet, BB202,135 pinout, BB202,135 application, or BB202,135 equivalent, key selection criteria include its steep C/V curve, low series resistance for high-Q VCO designs, tight capacitance tolerance across 0.2–2.3 V bias, thermal stability per Fig.4, and SOD523 footprint compatibility with space-constrained RF front-ends.

Technical Context

The BB202,135 is fabricated using planar silicon technology and optimized for low-voltage tuning (0.2–2.3 V range), enabling stable frequency control in battery-powered portable radios. Its capacitance exhibits a strong inverse relationship with reverse bias, with typical Cd dropping from 30.5 pF at 0.2 V to 9.5 pF at 2.3 V.

It features ultra-low series resistance (r_s ≤ 0.6 Ω at 100 MHz/30 pF), minimizing insertion loss in resonant tank circuits, and maintains junction temperature operation from −55 °C to +85 °C with reverse leakage ≤10 nA at 6 V and 25 °C.

Key Specifications

Pinout & Package

BB202,135 is housed in the SOD523 ultra-small surface-mount plastic package (JEDEC SC-79), with cathode marked by a bar on the top surface. Dimensions: 1.25 mm × 0.85 mm × 0.65 mm, lead pitch 0.5 mm, body thickness 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BBY52,115 and SMV1232-011, BB202,135 offers the highest capacitance ratio in SOD523, lowest r_s among sub-1 Ω varactors in this size, and guaranteed minimum C ratio-making it optimal for compact, wide-tuning-range FM and VCO designs where board area and phase noise are constrained.

Availability

BB202,135 is available at Aetrix Electronics and suitable for FM radio tuners, voltage-controlled oscillators, automotive antenna matching networks, and low-power wireless sensor transmitters requiring stable component supply and long-term obsolescence management.

Supply support for BB202,135 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 BB202,135 belongs to NXP's legacy RF varactor diode product line, engineered specifically for low-voltage, high-linearity electronic tuning in portable and battery-powered radio frequency systems.

FAQ

What is the maximum reverse voltage rating for BB202,135?

The BB202,135 has a continuous reverse voltage rating of 6 V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent junction damage. The device is intended for low-voltage tuning (0.2–2.3 V), and applying 6 V is permissible only for short-duration stress testing-not functional operation. Designers should maintain bias within 0.2–2.3 V to achieve the specified C/V characteristics and avoid accelerated aging.

Does BB202,135 have a specified temperature coefficient of capacitance?

Yes, BB202,135's temperature coefficient of capacitance (TC_Cd) is characterized in Fig.4 of the datasheet, showing typical values from 10⁻⁴ K⁻¹ at 1 V to <10⁻³ K⁻¹ at 0.2 V. This translates to approximately −60 to −90 ppm/°C across the 0.2–2.3 V tuning range, ensuring predictable center-frequency drift in VCOs operating from −55 °C to +85 °C.

Is BB202,135 pin-compatible with other SOD523 varactors like BBY52,115?

Yes, BB202,135 shares identical SOD523 mechanical dimensions and pinout (Pin 1 = cathode, Pin 2 = anode) with BBY52,115 and other NXP SOD523 varactors. The marking bar on the top surface aligns identically. No PCB layout change is required for substitution, though electrical differences-including C_0.2V, C_2.3V, and r_s-must be verified against circuit requirements before replacement.

What is the typical reverse leakage current of BB202,135 at 25 °C and 6 V?

At 25 °C and 6 V reverse voltage, BB202,135 exhibits a maximum reverse leakage current of 10 nA, as stated in the Electrical Characteristics table. This low leakage minimizes tuning voltage droop in high-impedance bias networks and supports stable VCO operation without active regulation. At 85 °C and 6 V, leakage rises to ≤100 nA-still within acceptable limits for most battery-powered applications.

Can BB202,135 be used in 2.4 GHz Bluetooth VCO designs?

Yes, BB202,135 is suitable for 2.4 GHz Bluetooth VCOs due to its low series resistance (≤0.6 Ω at 100 MHz/30 pF) and stable C/V behavior up to RF frequencies. Measured r_s remains <1.2 Ω at 2.4 GHz, supporting Q > 40 in typical 2.4 GHz tank circuits. Its SOD523 package also minimizes parasitic inductance-critical for maintaining phase noise performance below −110 dBc/Hz at 100 kHz offset.