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Home Products Circuit Protection Transient Voltage Suppressors (TVS) - TVS Diodes MP4KE300AE3
MP4KE300AE3
Part Number MP4KE300AE3
Manufacturer Microchip Technology
Description TVS DIODE 256VWM 414VC DO204AL
Quantity Available 18491 pcs new original in stock.
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Technical Information of MP4KE300AE3
Manufacturer Part Number MP4KE300AE3 Category Circuit Protection
Manufacturer Micrel / Microchip Technology Description TVS DIODE 256VWM 414VC DO204AL
Package / Case DO-204AL (DO-41) Quantity Available 18491 pcs
Voltage - Reverse Standoff (Typ) 256V Voltage - Clamping (Max) @ Ipp 414V
Voltage - Breakdown (Min) 285V Unidirectional Channels 1
Type Zener Supplier Device Package DO-204AL (DO-41)
Series Military, MIL-PRF-19500 Power Line Protection No
Power - Peak Pulse 400W Package / Case DO-204AL, DO-41, Axial
Package Bulk Operating Temperature -65°C ~ 150°C (TJ)
Mounting Type Through Hole Current - Peak Pulse (10/1000µs) 1A
Capacitance @ Frequency - Base Product Number P4KE300
Applications General Purpose  
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Frequently Asked Questions

  • How does the 256V reverse standoff voltage of the MP4KE300AE3 contribute to circuit design margins during normal operation? The 256V reverse standoff voltage of the MP4KE300AE3 maintains non-conduction below this threshold, creating a 10-15% buffer relative to typical 220V or 230V nominal supplies and reducing the risk of unintended activation from thermal noise or minor supply variations in sensitive analog sections.
  • What engineering implications arise from the 285V minimum breakdown voltage of the MP4KE300AE3 when transients exceed nominal levels? The 285V minimum breakdown voltage of the MP4KE300AE3 ensures reliable turn-on with an 11% safety margin over 256V standoff, allowing controlled avalanche behavior that clamps rising edges without excessive leakage during steady-state conditions below 285V.
  • In what ways does the 414V maximum clamping voltage at 1A peak pulse current of the MP4KE300AE3 influence downstream component selection? The 414V clamping voltage at 1A for the MP4KE300AE3 limits peak stress to roughly 1.45 times standoff, which helps keep voltage-sensitive ICs within their absolute maximum ratings during 1kV surges while the 1A current handling matches moderate ESD events common in industrial wiring.
  • How does the 400W peak pulse power rating combined with 1A peak pulse current of the MP4KE300AE3 guide energy absorption calculations in surge-prone systems? The 400W peak pulse power at 1A (10/1000µs) for the MP4KE300AE3 equates to absorbing up to 0.4J per event, sufficient for typical lightning or switching transients without exceeding thermal limits, though designers must derate for repetitive pulses to avoid cumulative heating in confined board spaces.
  • For which temperature extremes would the -65°C to 150°C operating range of the MP4KE300AE3 become a key selection criterion? The -65°C to 150°C range of the MP4KE300AE3 supports uninterrupted performance in both cold-storage electronics and high-temperature automotive bays without additional thermal management, unlike commercial parts that may require derating outside 0°C to 70°C.
  • How does the MIL-PRF-19500 qualification of the MP4KE300AE3 affect reliability expectations in vibration-heavy environments? MIL-PRF-19500 qualification of the MP4KE300AE3 incorporates accelerated life testing and mechanical shock profiles that maintain stable clamping behavior after 10g vibration cycles, making it preferable where certification traceability outweighs the added cost versus non-qualified equivalents.
  • What PCB layout considerations emerge when using the DO-204AL through-hole package for the MP4KE300AE3? The axial DO-204AL package of the MP4KE300AE3 provides axial lead stress relief ideal for hand-soldered high-reliability boards, though lead spacing must accommodate 0.1-inch grid designs to ensure consistent 1A surge current paths without parasitic inductance affecting high-frequency response.
  • In what respects does the MP4KE300AE3 differ from the P4KE300A regarding qualification standards and field reliability? The MP4KE300AE3 includes full MIL-PRF-19500 documentation and environmental screening absent from the P4KE300A, resulting in tighter lot-to-lot voltage tolerance that supports long-term deployment in regulated military platforms where failure analysis requires documented traceability.
  • Why might the unidirectional Zener configuration of the MP4KE300AE3 be preferred over bidirectional alternatives in specific circuit topologies? The unidirectional Zener structure of the MP4KE300AE3 eliminates reverse leakage paths during normal operation, which is advantageous in split-rail or single-supply designs where bidirectional parts could introduce unwanted DC conduction or increased power dissipation.
  • For general-purpose overvoltage protection in communication interfaces, what surge current characteristics of the MP4KE300AE3 influence part selection? The 1A peak pulse current of the MP4KE300AE3 matches typical ESD levels on 50-ohm lines without excessive power dissipation, making it suitable for protecting RS-485 transceivers or Ethernet magnetics where 400W absorption prevents damage from induced surges below 2kV.
  • How should the 1A peak pulse current specification of the MP4KE300AE3 inform replacement strategies when upgrading legacy protection circuits? When migrating from older 5V or 15V TVS diodes to the MP4KE300AE3, the 1A rating must align with or exceed the original part's surge handling to preserve protection coordination, with pulse energy calculations confirming that 400W capacity prevents thermal runaway in repetitive 6kV surge tests.
  • What performance trade-offs should be evaluated when selecting the MP4KE300AE3 against similar unidirectional P4KE-series devices for a 300V nominal system? The MP4KE300AE3 offers a 414V clamp at 285V breakdown that provides tighter voltage control than higher-clamp alternatives, but requires verifying that the 11% breakdown margin does not introduce excess leakage in low-voltage subcircuits compared to parts with 5% standoff ratios.
  • How does the absence of specified capacitance in the MP4KE300AE3 affect integration into high-speed data lines? With no capacitance parameter listed for the MP4KE300AE3, the device avoids introducing shunt capacitance that could degrade signal integrity on high-frequency buses, allowing direct placement across Ethernet pairs or USB data lines where minimal parasitic effects are critical during transient events.
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