Infineon Technologies BB439E6327HTSA1

Overview

BB439E6327HTSA1 from Infineon Technologies is a silicon hyperabrupt junction variable capacitance diode (varactor) in SOD323 package, optimized for VHF tuning circuits with 31.5 pF typical capacitance at 1 V, 6.9:1 capacitance ratio (CT2/CT25), and 0.35 Ω typical series resistance at 10 V/100 MHz. It enables precise frequency control in FM radio front-ends and VHF oscillator matching networks.

For engineers reviewing the BB439E6327HTSA1 datasheet, BB439E6327HTSA1 pinout, BB439E6327HTSA1 application, or BB439E6327HTSA1 equivalent, key selection criteria include reverse voltage rating (28 V), capacitance vs. voltage curve linearity, Q-factor at RF frequencies (280 @ 50 MHz), temperature coefficient of capacitance, and SOD323 thermal performance under continuous tuning bias.

Technical Context

This varactor uses a hyperabrupt doping profile to deliver a near-linear C–V relationship in the 1–25 V range, supporting stable resonance tracking across VHF bands (30–300 MHz). Its low series resistance (0.35 Ω typ.) and high Q (600 @ 200 MHz) minimize insertion loss and phase noise in LC tank circuits.

The device exhibits a negative temperature coefficient of capacitance (TCc ≈ −4 × 10⁻⁴ /°C at 3 V), enabling partial compensation of inductor drift in temperature-sensitive oscillators. Capacitance matching tolerance is ±3% at VR = 3 V and 25 V, critical for production-grade filter alignment.

Key Specifications

Pinout & Package

SOD323 surface-mount plastic package (2.1 mm × 1.25 mm × 0.95 mm), anode-cathode asymmetrical configuration with cathode marked by white band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BBY52-02W and SMV1232-011, BB439E6327HTSA1 provides optimal balance of VHF-range capacitance (31.5 pF), moderate tuning ratio (6.9:1), and ultra-low series resistance (0.35 Ω), making it ideal for cost-sensitive, space-constrained FM tuner and oscillator designs where phase noise and insertion loss are critical.

Availability

BB439E6327HTSA1 is available at Aetrix Electronics and suitable for FM radio tuners, VHF oscillator matching networks, TV channel selector filters, and RF calibration reference cells requiring stable component supply and tight capacitance matching.

Supply support for BB439E6327HTSA1 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with global R&D and manufacturing infrastructure.

BB439E6327HTSA1 belongs to Infineon's RF varactor diode product line, engineered specifically for high-linearity, low-loss VHF tuning in consumer and industrial wireless receivers.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The BB439E6327HTSA1 has a rated DC reverse voltage (VR) of 28 V at TA = 25°C, with peak reverse voltage (VRM) of 30 V for R ≥ 5 kΩ. Operation beyond 28 V increases leakage current exponentially and risks irreversible junction degradation, especially above 85°C ambient.

How does the capacitance change with temperature at 3 V bias?

At VR = 3 V, the BB439E6327HTSA1 exhibits a temperature coefficient of capacitance (TCc) of approximately −4 × 10⁻⁴ /°C, meaning capacitance decreases by ~0.04% per °C rise. This negative TCc partially compensates for the positive TC of typical air-core or ceramic inductors in VHF tank circuits.

Can this varactor be used in DC-coupled tuning circuits?

No - the BB439E6327HTSA1 must be reverse-biased at all times. DC coupling risks forward conduction if tuning voltage drops below cathode potential. A series blocking capacitor or dedicated DC bias network with RF choke is required to isolate DC tuning voltage from AC signal paths.

Is the SOD323 package compatible with standard reflow profiles for Pb-free assembly?

Yes - the BB439E6327HTSA1 uses a Pb-free matte tin finish on Cu leadframe and conforms to JEDEC J-STD-020D moisture sensitivity level 1. It supports peak reflow temperatures up to 260°C for ≤30 seconds, fully compliant with IPC-A-610 Class 2 and Class 3 requirements.