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Please be sure to read these general terms of use, before using this product.

Cautions about imitations

7NB-31R2-1

Production Start Date : 3/1/1988
Last Time Buy Date : 3/31/2026
Date of Discontinuation : 9/30/2026

Applications

Unsuitable Applications	Please be sure to read and comply with these "Precautions for use."
Specific Applications	Consumer equipment,Industrial Equipment Please refer to Our Website and specifications, etc. for information about the performance, functions, quality, management, and safety required for the above applications, and use Products after confirming the performance and reliability of the actual Product.

Unsuitable Applications

Please be sure to read and comply with these "Precautions for use."

Specific Applications

Consumer equipment,Industrial Equipment

Please refer to Our Website and specifications, etc. for information about the performance, functions, quality, management, and safety required for the above applications, and use Products after confirming the performance and reliability of the actual Product.

Appearance & Shape

Specifications

Resonance Frequency	1.3kHz
Resonant Frequency Torelance	±0.5kHz
Resonant Impedance (R1)	300Ω
Capacitance	40nF
Capacitance Tolerance	±30%
Measurement Condition of Capacitance	[120Hz]
Operating Temperature Range	-20℃ to 70℃
Storage Temperature Range	-30℃ to 80℃
Shape	No lead wire
Plate Size	31.2mm
Element Size	19.7mm
Plate Material	Nickel Alloy
Drive Type	External Drive
EIAJ Part Number	PD-SU2-C31-13
Mass	882mg

Features

1. Clear sound
2. Ultra thin and lightweight
3. No contacts: therefore, no noise and highly reliable
4. Low power consumption for voltage type

Packaging Information

Packaging	Specifications	Standard Packing Quantity
-	Bulk	1600

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Can be used up to 150℃ max.
* There are icons of plural temperature.

RoHS Directive compliant product

This product contain no restricted substances specified by RoHS Directive with more than maximum concentration value by weight in homogeneous material, except for cases falling under RoHS exemptions.

Restricted substances	Maximum concentration value
Lead	0.1%
Mercury	0.1%
Cadmium	0.01%
Hexavalent chromium	0.1%
Polybrominated biphenyls (PBB)	0.1%
Polybrominated diphenyl ethers (PBDE)	0.1%
Bis (2-ethylhexyl) phthalate (DEHP)	0.1%
Butyl benzyl phthalate (BBP)	0.1%
Dibutyl phthalate (DBP)	0.1%
Diisobutyl phthalate (DIBP)	0.1%

REACH Regulation compliant product:
The Product complies to provisions of REGULATION (EC) No 1907/2006 (Reach).

Restriction of the substances contained in the article under Reach:
REACH regulation impose restrictions of product applications and substance ban on the basis of Article 67.1.
The inclusion of a Substance of Very High Concern (SVHC) in the Candidate List creates the duty to communicate information on substances in articles to allow safe use of the article, which is applicable to suppliers in Europe (Reach Article 33). It does not impose any restrictions on the use of the products, nor is it a substance ban. Please check "Murata products containing SVHC and Information on safe use" .

AEC-Q200 compliant product

Products that acquired safety standard certification IEC60384-14.
Safety Standard Certification

Products that are based on the electrical appliance and material safety law of Japan.

Product of 10 to 40kV rated voltage

Low dissipation for high frequency
By devising ceramic materials and electrode materials, low dissipation is achieved in frequency bands of VHF, UHF and microwave or beyond.

Low inductance
This capacitor is designed so that the parasitic inductance component (ESL) that the capacitor has on the high frequency side becomes lower.

Product suitable for acoustic noise reduction and low distortion
This product suppresses acoustic noise, which occurs when a ceramic capacitor is used, by devising the materials and configuration.

Product resistant to deflection cracking
This capacitor is designed to prevent failures as much as possible by short mode caused by cracking when there is board deflection.

Product with solder cracking suppression
“This capacitor is configured with metal terminals and leads connected to the chip. The metal terminals and leads relieve the stress from expansion and contraction of the solder, to suppress solder cracking.”

No DC bias characteristics
Polymer capacitor is no capacitance change with DC bias due to aluminum oxidized film for dielectric.

By making full use of the water repellence of the capacitor surfaces, this product minimizes Ion migration from the external electrodes (Terminations) that results from condensation.

Low-inductance product suitable for noise suppression.
This product has extremely low ESL and is suitable for suppression of noise, including high frequencies.
Contributes to noise suppression as an EMI filter

Product for reflow soldering

Product for flow soldering

Limited to Conductive Glue Mounting
Since silver palladium is used for the external electrodes,the capacitor can be mounted by conductive adhesive.

Product for bonding
Since gold is used for the external electrodes, the capacitor can be mounted by die bonding/wire bonding.

Product for welding
Capacitor configured with lead electrodes and can be mounted by welding. Please contact us about the lead wire material.

Product dedicated for screw fixing

AEC-Q200 compliant product (* Deviation may be submitted. Please contact us for details.)

Can be used up to 155oC Max.
* There are icons of plural temperature.

Restricted substances	Maximum concentration value
Lead	0.1%
Mercury	0.1%
Cadmium	0.01%
Hexavalent chromium	0.1%
Polybrominated biphenyls (PBB)	0.1%
Polybrominated diphenyl ethers (PBDE)	0.1%
Bis (2-ethylhexyl) phthalate (DEHP)	0.1%
Butyl benzyl phthalate (BBP)	0.1%
Dibutyl phthalate (DBP)	0.1%
Diisobutyl phthalate (DIBP)	0.1%

Wound structure inductor which has ferrite material core.
→Detailed explanation

Wound structure inductor.
The use of magnetic iron powder ensure capability for large current.
→Detailed explanation

Wound structure inductor.
Using non-magnetic core like alumina material, shows high performance in high frequency range.
→Detailed explanation

Inductor of the film structure.
→Detailed explanation

Inductor of the multilayer structure.
→Detailed explanation

Less space by "2 coils in 1unit" structure inductor.

Low DC resistance type

Bias current characteristics improved

High Q type

Super High Q type

Tight inductance tolerance available

Reflow soldering applicable

Flow soldering applicable

	Products under development. Listed product specifications are subject to change without prior notice. Please contact us for sample availability and mass production schedule.
	Product is in mass production.
	Not recommended for new design.
	We are planning to discontinue production of this item. 'Last Time Buy' date or Discontinuation date may be shown on our web site. Before these dates, please contact us with your requirements.
	Production of this product has stopped.

	Murata particularly recommends this product for reasons of size and performance. Please contact Murata regarding pricing and delivery.

	This is a new product. Please contact Murata regarding pricing and delivery.

Restricted substances	Maximum concentration value
Lead	0.1%
Mercury	0.1%
Cadmium	0.01%
Hexavalent chromium	0.1%
Polybrominated biphenyls (PBB)	0.1%
Polybrominated diphenyl ethers (PBDE)	0.1%
Bis (2-ethylhexyl) phthalate (DEHP)	0.1%
Butyl benzyl phthalate (BBP)	0.1%
Dibutyl phthalate (DBP)	0.1%
Diisobutyl phthalate (DIBP)	0.1%

AEC-Q100 compliant product

AEC-Q200 compliant product

	Derating 1 The test voltage of these products is less than 150% of the rated voltage in the Durability / Operational Life Test. *Usually MLCC used with derating. So even this kind of products, special derating have not set specially. Please refer to below links for details 　For general purpose 　Only for mobile devices 　For automotive
	Derating 2 When the product temperature exceeds 105°C, please use this product within the voltage and temperature derated conditions in the figure below.
	Derating 3 Please apply the derating curve according to the operating temperature. Please refer to detailed specifications sheet for details.
	Derating 4 When the product temperature exceeds 125°C, please use this product within the voltage and temperature derated conditions in the figure below.
	Derating 5 Please apply the rated voltage derating over 150 degree C. Please refer to detailed specifications sheet for details.
	Derating 6 When the product temperature exceeds 105℃, please use this product within the voltage and temperature derated conditions in the figure below.
	Mobile application specific MLCC These MLCC products are designed for use in devices with a typical lifetime of less than 5 years. (Examples: Cellular phone, Smartphone, Tablet PC, Digital camera, Watch, Electronics dictionary, Small-scale server, IPC-9592B class1 equipment, etc. ) Mobile application specific MLCC products are designed so that the estimated useful life can be extended longer than 5 years under the following conditions: 「80% of the rated voltage or less, Maximum operating temperature -20 degree C or less」(10 years or more for general-purpose MLCC products). The estimated useful life under actual operating conditions can be approximated from the following chart. * The estimated useful life is the time when the cumulative failure rate of continuous use is 1%. * The estimated useful life data is provided for reference only. Please use it as a rough estimate when designing and using devices. The data is not intended as a guarantee of the product lifetime. * If you have any questions, please feel free to contact us. Lifetime of MLCC can also be estimated from voltage acceleration and temperature acceleration factors. Please refer to following URL about these lifetime estimation. Ceramic Capacitors FAQ "Are there any methods for estimating the lifetime of a capacitor? " Estimated useful life for mobile application specific MLCC
	Moisture-proof treatment required To prevent the migration and degradation due to flux residue, to keep parts under low moisture condition with resin coating and the equivalent.