Guard Ring Passivation 10 pF Capacitor High Power Low PIM Low ESR Capacitor Advanced Backside Metal Chip

HACC100S10V101 10pF 100V SLC Capacitor Advanced Backside Metal Guard-Ring Passivation High Power Low PIM Chip

Advanced Backside Metallization for Diverse Mounting: Why One Chip Should Support Every Assembly Process

RF module assembly lines rarely run a single process. One customer uses conductive silver epoxy for its low-temperature budget; another requires AuSn eutectic soldering for minimum thermal resistance; a third prefers sintered-silver for high-temperature automotive qualification. A capacitor that locks you into one mounting method creates supply chain fragmentation and forces duplicate qualification efforts. The HACC100S10V101 — a 10pF ±10%, 100V Single-Sided Bordered Single Layer Ceramic Capacitor (SLC) — is designed to eliminate this fragmentation with an asymmetric, dual-purpose metallization system optimized for every major die-attach method simultaneously.

The Asymmetric Metallization Advantage

Most chip capacitors use the same electrode metallization on both faces. This simplifies wafer fabrication but forces compromises: what works for wire bonding may perform poorly in eutectic reflow, and vice versa. The HACC100S10V101 takes a different approach — each electrode is independently optimized for its specific function:

The Pt barrier is the critical differentiator. During AuSn eutectic reflow at 300-320°C, molten gold-tin acts as an aggressive gold solvent — a standard Au electrode without a barrier dissolves within seconds, exposing the TiW adhesion layer which instantly oxidizes. The Pt barrier is thermodynamically immune: it neither dissolves nor forms intermetallics with tin or gold at any soldering temperature. For silver epoxy users, the Pt layer blocks silver ion diffusion into the gold layer, preventing the formation of brittle Au-Ag intermetallics that degrade die shear strength over time. This means one capacitor, one part number, one qualification — three assembly processes.

Single-Sided Bordered Design: Epoxy Containment Without Sacrificing Ground Contact

The HACC100S10V101 features a Single-Sided Bordered (Margin) architecture. The top electrode is surrounded by an un-metallized ceramic border that acts as a physical dam — during conductive silver epoxy (H20E) die attach, any excess epoxy that squeezes out from under the chip is stopped at the bottom edge. The ceramic margin physically prevents epoxy from climbing the sidewall and shorting to the top electrode. This is a fundamentally different approach from applied coatings: the margin is an integral part of the ceramic substrate and cannot be scratched, dissolved, or thermally degraded.

Contrary to double-sided bordered designs, the HACC100S10V101 keeps the bottom electrode fully metallized (borderless). This is an intentional engineering choice: a fully metallized bottom maximizes the electrical ground contact area, yielding the lowest possible RF ground impedance. In bypass applications, where capacitor impedance to ground directly determines supply decoupling effectiveness, this additional contact area measurably improves performance above 10GHz.

Guard-Ring and Edge Passivation: Eliminating the Surface Leakage Path

In high-voltage capacitors operating at 100V DC, surface leakage currents along the ceramic chip edges represent a subtle but significant reliability concern. These currents do not flow through the dielectric bulk — they travel along the chip sidewalls where moisture adsorption, ionic contamination, or dielectric surface states create a parallel conduction path. Over time, this surface leakage can degrade insulation resistance, increase power consumption in bias networks, and in extreme cases, create localized heating that accelerates dielectric aging.

The HACC100S10V101 addresses this through an integrated guard-ring and edge passivation design. The guard-ring structure creates an equipotential boundary around the active electrode area, steering surface charge carriers away from the critical dielectric interface. Combined with a passivated chip edge that suppresses moisture adsorption and ionic mobility, the result is maintained insulation integrity even after extended exposure to 85°C/85%RH environments. This is particularly important for outdoor-installed communication equipment and automotive under-hood electronics where condensation and humidity cycling are normal operating conditions.

High Power Handling and Low PIM: Why Single-Layer Beats Multilayer

Passive Intermodulation (PIM) is the generation of unwanted mixing products when two or more RF signals pass through a passive component with nonlinear characteristics. In cellular base station duplexers and satellite transponder filters, PIM products can fall directly into the receive band, desensitizing the receiver and reducing system capacity. The physics of PIM generation in capacitors is well understood: nonlinearities arise from ferroelectric domain wall motion (in Class II dielectrics), metal-oxide semiconductor junctions (at electrode-dielectric interfaces), and current crowding at internal electrode edges (in MLCCs).

The HACC100S10V101 minimizes PIM through its materials system and geometry:

• Single-layer coaxial current path: No internal electrodes, no vias, no edge current crowding. Current flows vertically through a uniform cross-section, eliminating the localized high-current-density regions where PIM products are generated in MLCCs.
• Class I COG/NPO dielectric option: Paraelectric ceramic with zero ferroelectric domain wall motion — the dominant PIM source in X7R/X5R MLCCs. The capacitance-voltage curve is perfectly linear from 0V to the 100V rated voltage.
• 100V continuous rating with 250% DWV margin: Generous voltage headroom prevents dielectric nonlinearity even under envelope-tracking supply modulation with 2-3* peak-to-average ratios.
• ESR below 0.1Ω at 1GHz: Minimizes I²R heating that would otherwise create thermal modulation of capacitance under high-power RF excitation.

For the circuit designer, these characteristics mean the capacitor introduces negligible intermodulation distortion, preserving the linearity budget for the active devices where it belongs. In a 4-transmit 4-receive (4T4R) 5G remote radio unit with 200MHz instantaneous bandwidth, low-PIM passive components are not optional — they are the difference between meeting and failing 3GPP receiver sensitivity requirements.

Key Electrical Specifications

Assembly Quick Reference

• Die Attach Options: Conductive silver epoxy (Epotek H20E, 120°C/30min cure), AuSn eutectic solder (300-320°C, N₂/H₂ forming gas), or sintered-Ag (for high-temperature applications).
• Wire Bonding: 25µm Au thermosonic ball bonding (120-150°C stage, >3.0g pull strength) or 25µm Al wedge bonding. Bond landing ≥25µm from electrode edge.
• Die Placement Force: Keep pick-and-place collet force below 50gf with compliant tip to prevent localized mechanical stress on the 0.15mm thin single-layer ceramic substrate. Silicone or ESD-safe elastomer collet tips recommended; avoid hard metal tips for 0.50*0.50mm die.
• Storage: Waffle pack or gel-pak in nitrogen cabinet, 20-25°C, 40-60% RH. Shelf life 1 year minimum.

Applications

• 5G FR2 & Emerging 6G mmWave Front-Ends: Ultra-low ESR and minimal parasitics enable clean coupling and DC blocking through 40GHz+, covering current 5G mmWave bands (n257-n262) and future 6G candidate bands above 100GHz with flip-chip mounting. Single-Sided Bordered design enables high-throughput automated assembly for high-volume small cell production.
• GaN-on-SiC and GaAs/InP Power Amplifier Modules: 100V rating with >250V DWV provides robust DC blocking margin for 28-50V drain bias networks in GaN HEMT and InP HBT power stages. Low PIM preserves ACLR mask compliance. Tighter ±5% tolerance available for differential PA architectures requiring precise inter-stage matching.
• LNA DC Blocking & Input Matching: The 10pF value with ESR below 0.1Ω at 1GHz introduces negligible noise figure degradation in low-noise amplifier front-ends. Near-zero TCC/VCC of COG/NPO dielectric maintains consistent impedance matching across temperature, eliminating cold-start gain variation.
• Optical Transceiver DC Blocks (100G/400G/800G): 10pF coupling capacitor with minimal parasitics ensures wideband signal integrity for 25-112Gbaud PAM4 data rates in QSFP-DD and OSFP modules. 0.15mm ultra-low profile fits within hermetic TOSA/ROSA lid clearance.
• Satellite Communication Payloads (LEO/MEO/GEO): Wide -55°C to +125°C range, multiple assembly options (epoxy, AuSn, sintered-Ag), and low PIM meet demanding communication payload specifications across L-band through Ka-band.
• Automotive Radar & V2X Modules (76-81GHz): Guard-ring passivation maintains insulation integrity through condensing humidity and temperature cycling exceeding AEC-Q200 Grade 1 requirements. Compatible with automotive-qualified epoxy and sintered-Ag die attach.

Contact us for evaluation samples with full S-parameter data, PIM characterization reports, or assembly compatibility testing for your specific process flow.