Silicon CapacitorsUBDC / BBDC / ULDC Series

Ultra-Broadband surface mounted differential Si capacitor pairs

Ultra broadband smart products have been developped to keep pace with evolving optical communication market requirements and customers' feedbacks. With an on-going miniaturization and improved performances of optoelectronics circuitries, *Murata offers some smart solutions by integrating differential capacitor pairs, matched termination...into a single silicon passive device. This unique integration based on ultra deep trench MOS Silicon offers unique performances with low insertion loss, low reflection and phase stability up to more than 60 GHz for the UBDC, up to 40 GHz for the BBDC and up to 20 GHz for the ULDC. These capacitors are fully compatible with high speed automated pick-and-place manufacturing operations and are available with ENIG termination and with SAC305 pre-bump for 0402M case size.

^* Murata Integrated Passive Solutions S.A.

Key features
UBDC / BBDC / ULDC series Specification
UBDC Series
Assembly Note
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Assembly notes

Key features

Ultra-broadband performance up to 67 GHz
Resonance free allowing ultra-low group delay variation
Ultra-low insertion loss thanks to an excellent impedance matching in transmission mode for UBB differential capacitor pair
Finer pitch (250 µm), and Smaller width line (90 µm) as well bump size diameter
True 100 Ohm differential line
Higher noise rejection
Cheaper than 2 single silicon capacitor for equivalent series
High stability of capacitance value over temperature, voltage and aging
High reliability
Compatible with lead free reflow soldering, Straight forward assembly process specially with SAC305 pre bumped version

(Please refer to our assembly note for more details)

UBDC / BBDC / ULDC series Specification

Parameter			Value
Parameter			UBDC 60GHz+ ^(*1)	BBSC 40GHz+ ^(*1)	ULSC 20GHz+ ^(*1)
Capacitance range			5.6nF to 10nF ^(*1)
Capacitance tolerances			±15% ^(*1)
Mounting method			Solder surface mounting ^(*3)
Operating temperature range			−55°C to 150°C
Storage temperature range			−70°C to 165°C ^(*2)
Temperature coefficient			+70 ppm / K
Rated Voltage (RV)			3.8V to 16V ^(*5)
Breakdown Voltage (BV)			11VDC to 30VDC^(*4)
Capacitance variation versus RVDC			0.1% / V (from 0V to RVDC)
AC-coupling (transmission mode)	Insertion Loss (IL)	@20GHz, +25°C	0.2 dB
		@40GHz, +25°C	0.5 dB	0.5 dB	(0.6 dB) ^(WC)
		@60GHz, +25°C	0.9 dB	(1.1 dB) ^(WC)	(1.3 dB) ^(WC)
	Return Loss (RL)	+25°C	12 dB	18 dB	25 dB
Capacitance insulation resistance		@RV, +25°C, 120s	> 10 GOhm
Ageing			Negligible, < 0.001% / 1000h
Capacitor thickness			100 µm

WC = worst case
(*1)Performances are guaranteed up to this limit. Component might be used above this limit with degraded performances.
(*2)w/o packing
(*3)Please check the assembly note for the mounting methods of each product.
(*4)See the FAQ here for the relationship between breakdown voltage and rated voltage.
(*5)10 years of intrinsic life time prediction at 100°C continuous operation.

UBDC Series

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Refer to this FAQ regarding the relationship between voltage tolerance and rated voltage.
See the FAQ here for the part numbering.

Assembly Note

Assembly Note Silicon Capacitor_Assembly by reflow (PDF: 1.1 MB)

UPDATE: 7/8/2021

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