Infineon Technologies BB555H7902XTSA1

Overview

BB555H7902XTSA1 from Infineon Technologies is a silicon tuning diode (varactor) designed for UHF-TV tuner front-end VCO and RF filter tuning circuits, featuring 14.01 pF typical capacitance at 2 V / 1 MHz, 8.9 typical capacitance ratio (CT₁/CT₂₈), and 0.6 nH series inductance in SC79 package.

For engineers reviewing the BB555H7902XTSA1 datasheet, BB555H7902XTSA1 pinout, BB555H7902XTSA1 application, or BB555H7902XTSA1 equivalent, key selection criteria include capacitance vs. voltage linearity across 1–28 V, low rₛ (0.58 Ω typ. at 470 MHz), tight matching (±0.25% ∆CT/CT over 4-diode sequence), and RoHS-compliant SC79 footprint compatibility with high-frequency PCB layout constraints.

Technical Context

This varactor operates as a voltage-controlled capacitor in resonant tank circuits, where reverse bias (1–28 V) modulates junction depletion width to achieve tunable capacitance. Its low LS (0.6 nH) and rS (0.58 Ω typ.) minimize Q-factor degradation above 470 MHz, supporting stable UHF oscillator phase noise performance.

The device uses an "in-line" matching assembly process ensuring ±0.25% capacitance matching across four consecutive diodes - critical for multi-stage filter alignment in broadcast tuner modules. Temperature coefficient of capacitance is specified per VR (e.g., −4×10⁻⁴/°C at 1 V), enabling predictable drift compensation in ambient-varying environments.

Key Specifications

Pinout & Package

BB555H7902XTSA1 is housed in the SC79 (SOD-523) surface-mount package - a 2-pin, cathode-marked, ultra-compact outline (1.3 × 0.7 × 0.6 mm) optimized for high-frequency layout density and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BAT54C and SMV1232-011LF, BB555H7902XTSA1 uniquely balances UHF-specific low LS (0.6 nH), production-grade matching (±0.25%), and 8.9 CT ratio - making it the only qualified choice for broadcast tuner reference designs requiring ETSI EN 300 744 compliance.

Availability

BB555H7902XTSA1 is available at Aetrix Electronics and suitable for UHF TV tuners, RF VCO calibration modules, multi-band filter banks, and FM radio IF alignment circuits requiring stable component supply across extended temperature ranges (−55 °C to +150 °C).

Supply support for BB555H7902XTSA1 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 is a German semiconductor manufacturer specializing in power management, RF, and automotive ICs, with leadership in high-reliability discrete RF components.

BB555H7902XTSA1 belongs to Infineon's BB5xx silicon varactor family, engineered specifically for broadcast tuner applications demanding high capacitance ratio, low parasitics, and production-matched parametric consistency.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The absolute maximum DC reverse voltage is 30 V at 25 °C, with peak reverse voltage rated at 35 V. Operation above 30 V risks irreversible junction breakdown, especially above 85 °C where IR rises to 200 nA - derating to 25 V is advised for 150 °C ambient designs.

Does BB555H7902XTSA1 support reflow soldering per JEDEC standards?

Yes - the SC79 package complies with IPC/JEDEC J-STD-020C, supporting peak reflow temperatures up to 260 °C for ≤30 seconds. The Pb-free terminations pass solderability testing per J-STD-002D, and the die attach withstands thermal cycling from −55 °C to +150 °C.

How is capacitance matching verified across production lots?

Matching is validated using an "in-line" assembly method where four BB555H7902XTSA1 diodes are sequentially tested on-wafer at 1 V and 28 V / 1 MHz. Only lots achieving ∆CT/CT ≤ ±0.25% across the quartet are released - documented in lot-specific test reports traceable to wafer ID.

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

No - BB555H7902XTSA1 must operate under reverse bias only. Forward conduction degrades junction integrity and causes irreversible capacitance shift. All tuning networks require DC blocking (e.g., RF choke + coupling capacitor) to isolate bias from RF signal paths.