NXP Semiconductors BB804,215

Overview

BB804,215 from NXP Semiconductors (formerly Philips Semiconductors) is a VHF variable capacitance double diode with common cathode configuration, fabricated in planar technology and housed in SOT23 package. It delivers 42–46.5 pF capacitance at 2 V reverse bias, 1.65–1.75 capacitance ratio (C₂V/C₈V), and 0.2 Ω typical series resistance at 100 MHz - enabling precise electronic tuning in FM radio front-ends.

For engineers reviewing the BB804,215 datasheet, BB804,215 pinout, BB804,215 application, or BB804,215 equivalent, key selection criteria include reverse voltage rating (18 V), junction temperature range (−55 °C to +125 °C), low leakage (<20 nA at 16 V, 25 °C), and dual-anode/common-cathode topology for differential varactor use in VHF oscillator tanks.

Technical Context

The BB804,215 integrates two identical silicon varactor diodes sharing a single cathode terminal, supporting symmetrical or push-pull tuning configurations. Its capacitance varies from ~44 pF at 2 V to ~26 pF at 8 V reverse bias, with a measured ratio of 1.7 under 1 MHz test conditions.

Designed for VHF band operation (30–300 MHz), it exhibits low series resistance (0.2 Ω typ.) critical for minimizing Q-factor degradation in resonant LC circuits, and maintains stable performance up to +125 °C junction temperature with <200 nA max reverse current at 60 °C.

Key Specifications

Pinout & Package

BB804,215 is packaged in the standard SOT23 (TO-236AB) plastic surface-mount package, measuring 2.9 × 1.3 × 1.0 mm with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB804,215, BBY40,215 offers lower capacitance and no dual-anode capability, limiting its use in balanced VHF oscillators; SMV1232-011 provides wider tuning range but trades 75% higher series resistance, reducing achievable resonator Q in high-performance FM synthesizers.

Availability

BB804,215 is available at Aetrix Electronics and suitable for FM radio tuners, VHF local oscillators, and automotive antenna matching circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BB804,215 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 formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The BB804,215 belongs to NXP's legacy RF varactor diode product line, engineered specifically for voltage-controlled tuning in VHF analog radio systems where precision, thermal stability, and dual-diode symmetry are essential.

FAQ

What is the maximum reverse voltage rating for BB804,215?

The BB804,215 has a maximum continuous reverse voltage rating of 18 V per diode, as defined by IEC 60134 Absolute Maximum Ratings. This allows safe operation across the full 0–16 V tuning range commonly used in FM radio applications without risk of junction breakdown. Exceeding 18 V may cause permanent damage to the BB804,215 device.

Does BB804,215 support dual-anode independent biasing?

Yes, BB804,215 features two isolated anodes (Pin 1 and Pin 2) sharing a common cathode (Pin 3), enabling independent or differential biasing of each varactor section. This architecture supports push-pull tuning schemes in VHF oscillator designs, improving linearity and reducing even-order distortion - a key capability not found in single-varactor alternatives like BBY40,215.

What is the typical series resistance of BB804,215 at 100 MHz?

The BB804,215 exhibits a typical series resistance of 0.2 Ω at 100 MHz, as specified in its Philips Semiconductor datasheet Rev. 03. This low value directly contributes to high Q-factor performance in LC tank circuits - critical for minimizing phase noise in FM local oscillators. Measured values remain within ±0.05 Ω across the −55 °C to +125 °C operating range.

How does the capacitance ratio of BB804,215 affect FM tuning linearity?

The BB804,215 has a capacitance ratio (C₂V/C₈V) of 1.65–1.75, indicating moderate voltage-to-capacitance nonlinearity. In FM radio tuning, this ratio translates to ~100 kHz frequency deviation over a 0–12 V control range - sufficient for standard 200 kHz channel spacing while maintaining monotonic response. The BB804,215 datasheet confirms this ratio is measured at 1 MHz, ensuring relevance to VHF oscillator design.

Is BB804,215 RoHS compliant and lead-free?

BB804,215 was originally released in 2004 under Philips Semiconductors and predates mandatory RoHS enforcement. While later NXP manufacturing lots (post-2006) are RoHS-compliant and lead-free, the BB804,215 variant referenced in this datasheet carries no explicit RoHS marking. Customers requiring compliance must verify lot-specific documentation or select NXP's actively supported RoHS-compliant replacements such as the BBY52 series.