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SMK325B7473KN-T

0.047µF MLCC, 630V, X7R, ±10%, 1210 package, high voltage, SMPS snubber

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Manufacturer Part：

SMK325B7473KN-T

Package：

1210 (3.2 x 2.5 x 2.1 mm)

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Description

Product Overview

The SMK325B7473KN-T from Taiyo Yuden is a 0.047µF (47nF) MLCC capacitor rated at 630V with X7R temperature coefficient in a 1210 package. Designed for high-voltage applications, it offers ±10% capacitance tolerance and operates from -55°C to +125°C. Ideal for SMPS snubber circuits and high-voltage DC link applications.

Key Specifications

Capacitance 0.047µF (47 nF)
Tolerance ±10% (K)
Rated Voltage 630V DC
Temperature Coefficient X7R (±15% over -55°C to +125°C)
Operating Temperature -55°C to +125°C
Package 1210 (3225 Metric, 3.2 x 2.5 x 2.1 mm)
Mounting Surface Mount
Packing Tape & Reel
Dielectric Class II (X7R)
Feature High voltage

Features

  • 630V high voltage rating in compact 1210 package
  • X7R temperature coefficient: ±15% over -55°C to +125°C
  • 0.047µF capacitance with ±10% tolerance
  • Low ESR and ESL for high-frequency filtering
  • Suitable for SMPS snubber and DC link applications
  • Compatible with lead-free reflow soldering
  • RoHS compliant
  • Surface mount for automated assembly

Applications

  • SMPS snubber circuits
  • High-voltage DC link capacitors
  • EMI filter capacitors
  • Switching power supply input/output filtering
  • LED driver power stages
  • Industrial motor drive filtering

The SMK325B7473KN-T from Taiyo Yuden is a 0.047µF multilayer ceramic capacitor (MLCC) with a 630V DC voltage rating in a 1210 (3225 metric) package. The X7R dielectric provides stable capacitance (±15%) over the full -55°C to +125°C temperature range. The high voltage rating in a compact surface-mount package makes this device ideal for SMPS snubber circuits, high-voltage DC link filtering, and EMI suppression in power electronics. The SMK series uses Taiyo Yuden’s advanced ceramic technology to achieve high capacitance density at high voltages. The K tolerance (±10%) ensures predictable capacitance for filter and snubber circuit design. The capacitor is RoHS compliant and compatible with standard lead-free reflow soldering profiles.

The SMK325B7473KN-T operates as a passive capacitive element:

1. MLCC Construction: The capacitor consists of multiple layers of barium titanate (BaTiO3) ceramic dielectric interleaved with inner electrode layers (typically nickel). The 0.047µF capacitance is achieved through the high dielectric constant of X7R ceramic (~3000) combined with the large effective electrode area from the multilayer structure. The 630V rating is achieved through sufficient dielectric layer thickness to prevent breakdown.

2. X7R Characteristics: The X7R dielectric is a Class II ferroelectric ceramic. Its capacitance varies by ±15% over the -55°C to +125°C range, with the variation following the Curie temperature characteristic of the modified barium titanate. The capacitance also exhibits DC bias dependence (capacitance decreases with applied DC voltage) due to the ferroelectric domain saturation effect.

3. High-Voltage Operation: The 630V rating ensures the dielectric layers can withstand the peak voltages encountered in SMPS snubber circuits and DC link applications. The low ESR (equivalent series resistance) and ESL (equivalent series inductance) of the MLCC structure enable effective high-frequency noise suppression.

Pin Name Type Function
1 Terminal 1 Passive Capacitor terminal (no polarity)
2 Terminal 2 Passive Capacitor terminal (no polarity)
  • SMPS snubber: 0.047µF at 630V suits RCD snubber circuits across switching MOSFETs in flyback converters operating from 400V DC bus, absorbing leakage energy
  • DC link filtering: 630V rating enables use as a DC link bypass capacitor in 400V PFC output stages, providing high-frequency ripple current bypass
  • EMI filters: X7R stability over temperature ensures consistent EMI filter performance in conducted emission suppression circuits across industrial temperature range
  • LED drivers: 0.047µF at 630V for snubber and filter circuits in offline LED lighting drivers operating from 85-265V AC mains
Manufacturer Part Number Package Notes
Taiyo Yuden SMK325B7473KN-T5 1210 Same specs, different packing
TDK C3225X7R2J473K200AB 1210 0.047µF, 630V, X7R
Murata GRM32DC72A473KW01L 1210 0.047µF, 100V, X7R
Samsung CL32B473KJVNNNE 1210 0.047µF, 630V, X7R
Yageo CC1210KKX7RBBB473 1210 0.047µF, 630V, X7R
AVX 1210YC473KAT2A 1210 0.047µF, 630V, X7R
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