Infineon Technologies BB 555 E7912

Overview

BB555 E7912 from NXP Semiconductors is a silicon tuning diode (varactor) designed for UHF-TV tuner front-end voltage-controlled oscillator (VCO) and RF filter tuning circuits. It delivers 14.01 pF typical capacitance at 2 V, 8.9 typical capacitance ratio (CT₁/CT₂₈), and 0.6 nH series inductance in SC79 package - enabling precise frequency pulling in 470–862 MHz broadcast bands.

For engineers reviewing the BB555 E7912 datasheet, BB555 E7912 pinout, BB555 E7912 application, or BB555 E7912 equivalent, key selection criteria include capacitance vs. voltage linearity across 1–28 V, low rₛ (0.58 Ω typ. at 470 MHz), tight ∆CT/CT matching (≤1% for 4-diode sequences), and RoHS-compliant SC79 footprint compatibility with high-density RF layouts.

Technical Context

This varactor operates as a voltage-dependent capacitor where reverse bias controls junction depletion width. Its "in-line" matching assembly ensures ≤1% capacitance deviation across 4-diode production sequences, critical for multi-band TV tuner channel alignment.

The device exhibits low temperature coefficient (±10⁻⁴/°C at VR = 1 V) and stable IR < 10 nA at 30 V/25°C, supporting reliable tuning over –55°C to +150°C ambient without drift-induced frequency offset.

Key Specifications

Pinout & Package

BB555 E7912 is housed in SC79 (SOD-523) surface-mount package: 1.3 mm × 0.7 mm × 0.6 mm, anode/cathode marked with laser "B" on cathode side, single-diode configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BB555-02V, E7912 offers identical RF performance but distinct date-code marking (E7912 = week 79, 2012 per CES code); versus BB535, it trades 1.2 pF lower C@1V for improved 8.9 CT₁/CT₂₈ ratio and tighter matching - favoring modern narrow-channel DVB-T2 implementations.

Availability

BB555 E7912 is available at Aetrix Electronics and suitable for UHF digital TV tuners, FM radio front-ends, and multi-standard broadcast receivers requiring stable component supply with guaranteed lot traceability and long-term continuity.

Supply support for BB555 E7912 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 leader focused on secure connectivity solutions for automotive, industrial, and consumer applications, with deep heritage in RF and analog components.

BB555 E7912 belongs to NXP's silicon tuning diode product line, engineered specifically for high-volume broadcast tuner modules demanding precision C(V) linearity, thermal stability, and production-matched performance.

FAQ

What is the maximum recommended reverse voltage for continuous operation?

The BB555 E7912 has a DC reverse voltage rating (V_R) of 30 V at 25°C, with a peak reverse voltage (V_RM) of 35 V for short-duration pulses. Operation above 30 V risks irreversible junction breakdown, especially at elevated temperatures where IR increases significantly - design must limit bias to ≤28 V for margin in 85°C environments.

How does capacitance matching work across multiple BB555 E7912 units?

BB555 E7912 uses NXP's "in-line" matching process: diodes are tested and binned sequentially on the wafer, then assembled in order. For 4-diode sequences, ∆CT/CT is guaranteed ≤1% across the full 1–28 V range - verified per Application Note AN047 - enabling direct replacement without individual calibration in multi-tuner systems.

Is BB555 E7912 compatible with lead-free reflow soldering?

Yes. The SC79 package is Pb-free and RoHS compliant, qualified for standard lead-free reflow profiles with peak temperature up to 260°C (per JEDEC J-STD-020). Thermal resistance from junction to ambient is 350 K/W, so board layout must ensure adequate copper pour and avoid adjacent high-power components to prevent localized overheating during soldering.

Can BB555 E7912 replace BB555-02V in existing designs?

Yes - BB555 E7912 and BB555-02V share identical electrical specifications, SC79 mechanical outline, and thermal ratings. The only differences are date-code marking format (E7912 vs. standard CES code) and reel packaging (3,000 vs. 8,000 pieces). No schematic or layout changes are required for drop-in substitution in production.