NXP Semiconductors BB135,135

Overview

BB135 from NXP Semiconductors is a UHF variable capacitance diode (varactor) fabricated in planar technology and housed in the SOD323 (SC-76) surface-mount package. It delivers C_0.5V = 17.5–21 pF, C_28V = 1.7–2.1 pF, capacitance ratio ≥8.9, series resistance ≤0.75 Ω at 470 MHz, and operates up to +125 °C junction temperature - optimized for electronic tuning in UHF TV tuners and VCOs.

For engineers reviewing the BB135 datasheet, BB135 pinout, BB135 application, or BB135 equivalent, key selection criteria include reverse voltage range (0–30 V), low-series-resistance performance at UHF frequencies, linearity of C–V curve, thermal stability across −55 °C to +125 °C, and SOD323 footprint compatibility with high-density RF layouts.

Technical Context

The BB135 functions as a voltage-controlled capacitor where reverse bias modulates depletion-layer width and thus junction capacitance. Its planar silicon construction ensures stable C–V characteristics with low temperature coefficient (typ. <10⁻³ K⁻¹ at V_R = 4 V) and minimal leakage (≤10 nA at 30 V, 25 °C).

Designed specifically for UHF operation (up to 1 GHz), it achieves low series resistance (r_s ≤ 0.75 Ω @ 470 MHz) and high capacitance ratio (8.9–12), enabling precise frequency pulling in oscillator and filter tuning circuits without requiring external compensation networks.

Key Specifications

Pinout & Package

BB135 is packaged in the SOD323 (SC-76) plastic surface-mount case - measuring 1.35 × 0.85 × 0.45 mm - with cathode marked by a bar on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB134 and SMV1232-011, the BB135 uniquely balances 30 V rating, 8.9–12 C-ratio, and proven UHF linearity - making it the preferred choice for legacy and cost-sensitive UHF television tuner designs where extended voltage headroom and field-proven stability are mandatory.

Availability

BB135 is available at Aetrix Electronics and suitable for UHF television tuners, voltage-controlled oscillators, radio upconversion circuits, and RF filter tuning applications requiring stable component supply and long-term obsolescence management.

Supply support for BB135 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 delivering high-performance mixed-signal and standard products, with leadership in RF, analog, power management, and security technologies.

The BB135 belongs to NXP's discrete RF varactor diode product line, engineered specifically for UHF electronic tuning in broadcast and communications equipment where precision C–V response and miniature packaging are essential.

FAQ

What is the maximum reverse voltage rating for the BB135?

The BB135 has a continuous reverse voltage rating of 30 V, as defined in its Absolute Maximum Ratings table. This value represents the upper limit of applied DC reverse bias under which the device maintains specified capacitance and leakage performance. Exceeding 30 V risks permanent junction damage. The BB135 is commonly operated between 0.5 V and 28 V to achieve its full capacitance tuning range while preserving reliability and linearity.

What does the marking code 'P5' indicate on the BB135 package?

'P5' is the manufacturer's top-side marking code for the BB135, used for part identification and traceability. It appears adjacent to the cathode bar on the SOD323 package body. This marking is standardized per NXP's packaging specification and confirms the device as the BB135 variant - distinct from BB134 (which shares identical specs but is designated for matched-pair use). No functional or electrical meaning is encoded in 'P5' beyond part identity.

How does the BB135 achieve low series resistance at UHF frequencies?

The BB135 achieves ≤0.75 Ω series resistance at 470 MHz through optimized planar silicon processing, including shallow junction depth and low-resistivity epitaxial layer design. This minimizes bulk and contact resistance contributions, directly improving Q-factor in resonant circuits. Measured data confirms r_s remains stable up to 1 GHz, making the BB135 suitable for UHF VCOs where low loss is critical to phase noise performance.

Is the BB135 suitable for automotive applications?

No, the BB135 is not automotive-qualified. Per NXP's official documentation, it is classified as a non-automotive qualified product - neither tested nor warranted for AEC-Q200 stress requirements or automotive temperature ranges (−40 °C to +125 °C ambient). Its specified operating junction temperature is −55 °C to +125 °C, but system-level validation for automotive use is the customer's responsibility. For automotive-grade varactors, consult NXP's dedicated AEC-Q200 qualified portfolio.

What is the capacitance tolerance of the BB135 at 0.5 V reverse bias?

At 0.5 V reverse bias and T_j = 25 °C, the BB135 exhibits a capacitance range of 17.5 pF (minimum) to 21 pF (maximum), representing a ±10% typical tolerance about the nominal 19.25 pF value. This spread is guaranteed per the Electrical Characteristics table and reflects process variation in junction area and doping profile. Designers should account for this tolerance when calculating VCO tuning slope or filter center-frequency shift.