NXP Semiconductors BB189,115

Overview

BB189 from NXP Semiconductors is a planar technology variable capacitance diode (varactor) in an ultra-small SOD523 (SC-79) surface-mount package, designed for UHF tuning applications. It delivers Cd(2V) = 14.15–15.75 pF, Cd(25V) = 1.89–2.18 pF, Cd(2V)/Cd(25V) ≥ 6.3, series resistance rs = 0.6–0.7 Ω at 470 MHz, and capacitance matching ≤ 1.8 % via Direct Matching Assembly (DMA).

For engineers reviewing the BB189 datasheet, BB189 pinout, BB189 application, or BB189 equivalent, this varactor is selected for high-linearity, low-loss UHF VCOs and TV tuner front-ends where tight capacitance tracking, minimal series loss, and space-constrained layouts are critical design requirements.

Technical Context

The BB189 operates as a reverse-biased junction varactor, leveraging planar silicon process control to achieve stable, temperature-compensated capacitance variation across 2 V to 25 V bias. Its performance is characterized at 1 MHz and validated up to 470 MHz with specified rs and TCCd curves.

It employs gliding matching and Direct Matching Assembly (DMA) to ensure ≤1.8 % capacitance deviation across sequential diodes - a requirement for balanced differential VCO topologies and multi-stage tuning networks requiring matched pairs.

Key Specifications

Pinout & Package

BB189 is housed in a 2-terminal SOD523 (SC-79) plastic surface-mounted package measuring 1.25 × 0.85 × 0.65 mm (L × W × H), with cathode identified by a marking bar.

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, the BB189 uniquely balances high Cd ratio, sub-0.7 Ω series resistance, and 1.8 % factory matching - making it the preferred choice for cost-sensitive, high-volume UHF TV and IoT transceiver tuning where layout density and pair consistency are critical.

Availability

BB189 is available at Aetrix Electronics and suitable for UHF television tuners, wireless infrastructure VCOs, differential RF filters, and compact ISM-band radio modules requiring stable component supply and tight parametric consistency across production lots.

Supply support for BB189 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 BB189 belongs to NXP's RF varactor diode product line, engineered specifically for high-precision, high-density UHF tuning in broadcast and wireless communication systems where matching, size, and RF loss are primary constraints.

FAQ

What is the maximum reverse voltage rating for BB189?

The BB189 has an absolute maximum reverse voltage (VR) rating of 32 V per IEC 60134. Operation up to 25 V is specified in the capacitance characteristics table, providing a 7 V safety margin. Exceeding 32 V risks permanent junction breakdown. The BB189 datasheet confirms this limit in Table 4 under "Limiting values", and all electrical characteristics are validated within the 2 V to 25 V tuning range.

How is capacitance matching achieved in BB189?

Capacitance matching in BB189 is achieved through a two-stage process: gliding matching during wafer sort followed by Direct Matching Assembly (DMA) at final test. This yields ≤1.8 % ΔCd/Cd across sequential diodes, enabling matched-pair usage without binning or trimming. The BB189 datasheet specifies this in Table 5 and Section 1.2, confirming its suitability for differential VCO and filter designs requiring intrinsic symmetry.

What package type does BB189 use and how is polarity marked?

BB189 uses the SOD523 (SC-79) plastic surface-mount package, measuring 1.25 × 0.85 × 0.65 mm. Polarity is indicated by a marking bar on the cathode end (Pin 1), as shown in Figure 4 and Table 1 of the BB189 datasheet. This compact 2-terminal outline supports high-density RF layouts and automated assembly with standard 0201-compatible pick-and-place equipment.

What is the typical series resistance of BB189 and why does it matter?

The BB189 exhibits a typical series resistance (rs) of 0.6–0.7 Ω measured at 470 MHz with Cd = 9 pF. This low rs directly preserves the quality factor (Q) of resonant tank circuits, minimizing phase noise degradation in VCOs and insertion loss in tunable filters. The BB189 datasheet reports rs in Table 5 under "Characteristics", and its impact is confirmed in RF design simulations where rs > 1 Ω increases close-in phase noise by >3 dB.

Can BB189 be used in automotive applications?

The BB189 is not qualified for automotive applications per AEC-Q200. Its junction temperature rating is +125 °C and storage range is −55 °C to +150 °C, but it lacks automotive-specific qualification testing (e.g., HTOL, temperature cycling, board-level vibration). For automotive-grade alternatives, consider NXP's AEC-Q200-qualified varactors like the BBY58 series. The BB189 datasheet states suitability for "UHF television tuners" and general RF tuning, not automotive environments.