NXP Semiconductors BB179,135

Overview

BB179,135 from NXP Semiconductors is a planar variable capacitance diode (varactor) designed for UHF tuning applications, featuring 2.1 pF capacitance at 28 V reverse bias, 9:1 capacitance ratio (1 V to 28 V), and 0.6–0.75 Ω series resistance at 470 MHz. It operates in electronic tuning circuits for UHF television tuners and voltage-controlled oscillators (VCOs), where precise capacitance control under reverse bias is critical.

For engineers reviewing the BB179,135 datasheet, BB179,135 pinout, BB179,135 application, or BB179,135 equivalent, this varactor's ultra-small SOD523 package, gliding-matched 2% capacitance tracking across diode pairs, and verified low-loss RF performance at UHF frequencies are key selection criteria for high-stability oscillator and tuner designs.

Technical Context

The BB179,135 uses planar silicon technology to achieve stable, voltage-dependent junction capacitance with minimal series resistance-critical for minimizing phase noise in VCOs. Its capacitance-voltage curve is characterized from 1 V to 28 V reverse bias, with typical Cd(1 V) = 20 pF and Cd(28 V) = 2.1 pF.

It employs Direct Matching Assembly (DMA) for tight inter-device capacitance matching (≤2% over 10-diode sequences), enabling balanced differential tuning networks. The device is rated for continuous reverse voltage up to 30 V and peak reverse voltage up to 35 V with external current limiting.

Key Specifications

Pinout & Package

SOD523 (SC-79) ultra-small plastic surface-mount package: 1.25 mm × 0.85 mm × 0.55 mm body, 2-terminal configuration, cathode marked by bar on top surface.

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 BB179,135 delivers optimal balance of UHF capacitance ratio, SOD523 size, and proven DMA matching-making it the preferred choice for cost-sensitive, space-constrained UHF tuner and VCO designs requiring predictable 470–862 MHz coverage.

Availability

BB179,135 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators (VCOs), FM radio front-ends, and automotive keyless entry transmitters requiring stable component supply and consistent parametric performance across production lots.

Supply support for BB179,135 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 BB179,135 belongs to NXP's RF varactor diode product line, engineered specifically for high-linearity, high-matching UHF tuning in broadcast and wireless infrastructure-prioritizing stable C-V characteristics and manufacturable DMA pairing over general-purpose switching or power handling.

FAQ

What is the primary function of the BB179,135 in RF circuits?

The BB179,135 functions as a voltage-controlled variable capacitance diode (varactor), used to tune resonant frequencies in UHF oscillator and filter circuits. Its capacitance changes predictably with applied reverse bias voltage-enabling electronic frequency adjustment without mechanical components. In the BB179,135, this behavior is optimized for 470–862 MHz operation with low series resistance and tight unit-to-unit matching.

Does the BB179,135 support operation at elevated temperatures?

Yes, the BB179,135 is specified for junction temperatures from −55 °C to +125 °C, with capacitance and leakage characteristics validated across that range. Reverse current remains ≤200 nA at VR = 30 V and Tj = 85 °C, confirming reliable operation in thermally demanding tuner modules and automotive-adjacent environments where the BB179,135 may be deployed.

How is capacitance matching achieved in the BB179,135?

The BB179,135 achieves ≤2% capacitance matching via Direct Matching Assembly (DMA), a proprietary NXP process combining gliding measurement across sequential diodes with precision binning and packaging. This ensures tightly correlated C-V curves in paired devices-critical for balanced VCO cores and image-reject filter topologies where the BB179,135 is commonly applied.

Can the BB179,135 be used in place of standard switching diodes?

No-the BB179,135 is not intended as a general-purpose switching diode. It is optimized for reverse-bias varactor operation, with parameters like low series resistance and controlled C-V nonlinearity. Forward conduction is limited to 20 mA, and its structure prioritizes junction capacitance stability-not fast recovery or surge handling. Substituting the BB179,135 for a switching diode would compromise circuit functionality and reliability.

What does the "135" suffix in BB179,135 indicate?

The "135" suffix in BB179,135 denotes the specific tape-and-reel packaging variant per NXP's ordering system: 10,000 units per reel, 8 mm tape width, and embossed carrier tape compliant with EIA-481-D standards. This packaging format ensures automated placement compatibility and is distinct from other variants like BB179,115 (3,000/reel) or BB179,125 (15,000/reel).