What the DIN VDE V 0884-11:2017-01 standard means for your isolated designs

As of January 2020, Deutsches Institut für Normung (DIN) V Verband der Elektrotechnik, Elektronik und Informationstechnik (VDE) V 0884-10:2006-12 is no longer an active certification standard for evaluating the intrinsic insulation characteristics and high-voltage capabilities of magnetic and capacitive galvanic isolation products. This marks the end of a three-year transition period for integrated circuit (IC) manufacturers that began in 2017 when VDE released the DIN VDE V 0884-11:2017-01 updated standard. IC manufacturers must now upgrade to the new certification requirements or remove VDE certification from their corresponding data sheets.

Since this standard is the only component-level certification for basic and reinforced digital isolators (including integrated isolators such as isolated interfaces, isolated gate drivers, isolated amplifiers, etc.), it helps original equipment manufacturers and end-equipment manufacturers feel confident that a digital isolator will meet their systems’ high-voltage requirements and end-equipment level certifications.


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What’s new in DIN VDE V 0884-11?

There are several critical changes in the certification process and requirements from DIN V VDE V 0884-10 to DIN VDE V 0884-11. These changes, as shown in Table 1, list the component standards for both basic and reinforced certification.

Criteria / parameter

DIN V VDE V 0884-10

DIN VDE V 0884-11

Max surge isolation voltage (VIOSM)

 

  • Reinforced test voltage = 1.6 x VIOSM
  • Basic test voltage = 1.3 x VIOSM
  • Reinforced minimum = 10 kV
  • 50 surge strikes (unipolar)

  • Reinforced test voltage = 1.6 x VIOSM
  • Basic test voltage = 1.3 x VIOSM
  • Reinforced minimum = 10 kV
  • 50 surge strikes (bipolar, 25 each polarity)

Max working/repetitive isolation voltage determination

(VIOWM, VIORM)

Insulation lifetime data is not required

Based on TDDB insulation lifetime data analysis

Partial discharge test voltage

(VPD(M))
  • Reinforced = 1.875 x VIORM
  • Basic = 1.5 x VIORM

  • Reinforced = 1.875 x VIORM
  • Basic = 1.5 x VIORM

Minimum rated lifetime

Not defined

  • Reinforced = 20 years x 1.875 (safety margin)
  • Basic = 20 years x 1.3 (safety margin)

Failure rate over lifetime

Not defined

  • Reinforced = < 1 ppm
  • Basic = < 1,000 ppm

Standard / certification expiration

January 2020

No set expiration date

Table 1: DIN V VDE updates (basic and reinforced)

What hasn’t changed in DIN VDE V 0884-11?

While the partial discharge testing criteria do not change in DIN VDE V 0884-11, it is useful to understand the relevance of partial discharge testing on isolation components. Both TI and VDE still test for partial discharge in silicon-dioxide-based digital isolators, even though silicon dioxide does not have partial discharge. Optocouplers use partial discharge testing as a means to screen out bad production units built with an unwanted void in the dielectric. It is critical to rule out units with any defects, but it is important to note that you cannot depend on this testing as a minimum guaranteed lifetime test. The time-dependent dielectric breakdown (TDDB) testing done on digital isolators – but not on optocouplers – is an accurate lifetime testing process. Read the white paper, “Enabling high voltage signal isolation quality and reliability” to learn more about TDDB testing.

Why IC certifications matter

Certifications allow equipment manufacturers to confidently use isolation devices in their products worldwide, meet end application design requirements, and know whether an isolator will work reliably throughout its lifetime. Updates and revisions to certification requirements, like those from DIN VDE, ensure that high-voltage safety requirements remain relevant and as stringent as necessary. Since it is not a guarantee that a component manufacturer has met the requirements of DIN VDE V 0884-11, it is crucial to review board components for both future and existing designs to ensure that they still meet the certification requirements.

Additional resources

Anonymous
  • Hi Baptiste,

    From your message above, it is not clear exactly how you are implementing your circuit but I'd like to make the following points:

    • The high voltage capability of ISO7310C and other digital isolators reflect the voltage difference between two grounds (GND1 & GND2) across the isolation barrier and not between VCC1 and GND1. So if you have a temporary 1000V transient between GND1 & GND2, it should be OK. Please note that the working voltage of ISO7310C is 400Vrms or 566Vpk, so if 1000 Vdc in your application will be a permanent voltage different between the two sides, then you should consider ISO7710DW which can provide you working voltage of 2121 Vdc for the lifetime (>20 years) of the insulation.
    • IEC 60664-1 is insulation coordination standard and we don't certify our components to this standard but we refer to the standard for insulation coordination.
    • I'm not sure how high frequency (>500 Mbps) signals and safety caps in your application are interfacing with ISO7310C. We may need to review your circuit to dive deeper.

    Thanks,Saleem

  • Hi Luke,

    Thanks for this great article !
    I am currently working in Electric Vehicle and especially on a utility device with RF signals at high voltage for specific application
    (utility device for monitoring of RF patterns on HV).
    wondering the use of ISO7310C and a complementary set of safety caps for high-rate signals >500Mbps signals totally floating where I cannot use the ISO7310C or any semiconductors because of the high frequency.

    Then I have 2 questions

    1. How will ISO7310C supply react against 1000Vdc floating HV (mains peak to 2500Vac as per category II of IEC 60664-1) ? Is the basic insulation to be carried only by the transformer? In this case, is the ISO7310C compatibility with DIN VDE V 0884-11 also complying with IEC60664-1? It was not straightforward in this document;
    2. On the Y2 safety caps: should I put 1 or 2 safety caps per signal in order to get basic insulation according to IEC60664-1? I want to use the same insulation section to receive bothe "high" and "low" frequency signals.

    I think I will might get some EMC issues between the signals hosted by the ISO7310C which are "low-frequency" 1MBps against the signals hosted by the safety caps, nevertheless I have the ground on ISO7310C's isolated supply: do you think this ground could be used for EMC noise suppression filter or for an optional wires shielding?

    Thanks in advance for your hints!
    Baptiste

  • Hi Luke,

    Great article!

    Here is the direct link to the DIN VDE V 0884-11 certificate. It lists all the TI ISO devices that have been certified so far and it gets updated over time:

    VDE certificate for reinforced isolation for DIN VDE V 0884-11:2017-01 : www.ti.com/.../SZZQ123

    VDE certificate for basic isolation for DIN VDE V 0884-11:2017-01 :                   www.ti.com/.../SZZQ073

    Anthony