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Type SCM Single/Dual IGBT Snubber Capacitor Modules
High Peak Current Snubber with Integrated Hyperfast Diode
Typical Applications
Discharge Restrictive De-coupling
The circuit in Figure 1 operates on the same principles as the
de-coupling capacitor, but only during turn-off switching. As
the IGBT turns off, energy trapped in the loop inductance is
transferred to the capacitor. The diode blocks oscillations from
occurring and excess charge on the capacitor is discharged
through the external resistor.
?  1 or 2 wire taps for connecting external resistor
?  Flame resistant case and epoxy, meets UL 94V0
?  Other terminal pitches and capacitance values
available.
Figure 1
Style SCM Discharge restrictive decoupling used
to protect dual IGBT modules
RCD Clamp
The function of this snubber is similar to a clamp, Figure 2. At
turn-off, the snubber diode is forward biased and the snubber
is activated. The energy trapped in the stray inductance is
absorbed by the snubber capacitor. During turn-on the snubber
caps that were fully charged to bus voltage have a discharge
path through the forward biased free-wheel diode, the IGBT,
and the snubber resistors. This reduces the reverse recovery
voltage transient.
Figure 2
Style SCM “P” type and “N” type used as a clamp to protect
an inverter using two “single” IGBT modules
Notice and Disclaimer: All product drawings, descriptions, specifications, statements, information and data (col-
lectively, the “Information”) in this datasheet or other publication are subject to change. The customer is respon-
sible for checking, confirming and verifying the extent to which the Information contained in this datasheet or
other publication is applicable to an order at the time the order is placed. All Information given herein is believed
to be accurate and reliable, but it is presented without any guarantee, warranty, representation or responsibility
of any kind, expressed or implied. Statements of suitability for certain applications are based on the knowledge
that the Cornell Dubilier company providing such statements (“Cornell Dubilier”) has of operating conditions
that such Cornell Dubilier company regards as typical for such applications, but are not intended to constitute any
guarantee, warranty or representation regarding any such matter – and Cornell Dubilier specifically and expressly
disclaims any guarantee, warranty or representation concerning the suitability for a specific customer application,
use, storage, transportation, or operating environment. The Information is intended for use only by customers who
have the requisite experience and capability to determine the correct products for their application. Any technical
advice inferred from this Information or otherwise provided by Cornell Dubilier with reference to the use of any
Cornell Dubilier products is given gratis (unless otherwise specified by Cornell Dubilier), and Cornell Dubilier as-
sumes no obligation or liability for the advice given or results obtained. Although Cornell Dubilier strives to apply
the most stringent quality and safety standards regarding the design and manufacturing of its products, in light of
the current state of the art, isolated component failures may still occur. Accordingly, customer applications which
require a high degree of reliability or safety should employ suitable designs or other safeguards (such as instal-
lation of protective circuitry or redundancies or other appropriate protective measures) in order to ensure that
the failure of an electrical component does not result in a risk of personal injury or property damage. Although all
product-related warnings, cautions and notes must be observed, the customer should not assume that all safety
measures are indicated in such warnings, cautions and notes, or that other safety measures may not be required.
CDE Cornell Dubilier ? 1605 E. Rodney French Blvd. ? New Bedford, MA 02744 ? Phone: (508)996-8561 ? Fax: (508)996-3830
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