NXP Semiconductors BB207,235

Overview

BB207 from NXP Semiconductors is a silicon planar variable capacitance double diode with common cathode configuration, designed for FM radio tuning circuits. It delivers 81 pF capacitance at 1 V reverse bias, 27.6 pF at 7.5 V, a minimum capacitance ratio of 2.6, series resistance of 0.2–0.4 Ω at 100 MHz, and operates up to 125 °C junction temperature.

For engineers reviewing the BB207 datasheet, BB207 pinout, BB207 application, or BB207 equivalent, this device is selected for precision voltage-controlled oscillator (VCO) tuning in compact FM receiver front-ends where linearity, low loss, and SOT23 space efficiency are critical.

Technical Context

The BB207 integrates two identical varactor diodes sharing a single cathode terminal, enabling differential or dual-tuning configurations in RF matching networks. Its capacitance-voltage response is characterized across 1–7.5 V reverse bias with tight ±5 pF tolerance at 1 V and ±2.1 pF at 7.5 V.

Designed for high-frequency operation, it maintains low series resistance (<0.4 Ω) at 100 MHz and exhibits reverse leakage ≤10 nA at 15 V and 25 °C - critical for stable oscillator Q-factor and minimal frequency drift in battery-powered receivers.

Key Specifications

Pinout & Package

Encapsulated in the standard SOT23 plastic surface-mounted package (JEDEC TO-236AB), the BB207 uses a 3-lead outline with 1.9 mm × 1.3 mm body size, 0.95 mm height, and gull-wing leads for reliable reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BBY52,215 and SMV1232-011, the BB207 uniquely balances dual-anode functionality, FM-optimized capacitance range, and cost-effective SOT23 packaging - making it the optimal choice for high-volume consumer radio tuner designs where layout symmetry and leakage-limited bias stability are essential.

Availability

BB207 is available at Aetrix Electronics and suitable for FM radio tuners, voltage-controlled oscillators, RF filter tuning networks, and electronic channel selectors requiring stable component supply across consumer electronics production cycles.

Supply support for BB207 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 markets.

The BB207 belongs to NXP's legacy RF discrete portfolio, engineered specifically for analog FM receiver tuning applications where predictable varactor behavior, low parasitic resistance, and SMT manufacturability were prioritized.

FAQ

What is the primary function of the BB207 in an FM radio circuit?

The BB207 serves as a voltage-controlled tuning element in FM radio front-end oscillator and filter circuits. Its two independent anodes and shared cathode allow precise, low-loss capacitance variation (81 pF to 27.6 pF) under reverse bias, enabling stable local oscillator frequency synthesis across the 87.5–108 MHz band. The BB207 achieves this with minimal series resistance and leakage, directly supporting high-Q tank performance.

Does the BB207 support differential tuning configurations?

Yes - the BB207's dual-anode, common-cathode architecture explicitly supports differential or push-pull tuning. By applying complementary control voltages to pins 1 and 2 while referencing pin 3 to ground or a fixed bias, designers can cancel even-order distortion in VCOs. This capability is confirmed in NXP's application guidance for FM synthesizer designs using the BB207.

What is the maximum reverse voltage rating for the BB207?

The BB207 has a continuous reverse voltage rating of 15 V per diode, as specified in Table 4 of the official NXP product data sheet (Rev. 3, 2011). Exceeding this value risks permanent junction damage. For FM tuning applications, operating below 8 V reverse bias is typical to maintain optimal linearity and avoid breakdown-related leakage increase.

Is the BB207 RoHS compliant?

Yes - the BB207 is RoHS compliant per NXP's product change notification PCN-2006-001 and subsequent compliance declarations. The SOT23 package uses lead-free terminations, and the device meets EU Directive 2011/65/EU requirements. Full compliance documentation is available via NXP's quality portal using the BB207 part number.

Can the BB207 replace older varactor diodes like BB105 in existing designs?

The BB207 is not a direct drop-in replacement for BB105 due to differences in capacitance profile and pinout. BB105 uses an anode-common configuration (SOT23 pin 1 = cathode, pin 2 = anode, pin 3 = cathode), whereas BB207 uses cathode-common (pin 3 = cathode). Layout and bias network changes are required. Always verify tank impedance matching and frequency sweep range when substituting the BB207 for legacy varactors.