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Microchip Technology MAPLAD18KP58A
- Part No.:
- MAPLAD18KP58A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP58A.pdf
- Description:
- TVS DIODE 58VWM 93.6VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,199
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Product details
Overview
MPLAD18KP58A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps to ≤93.6 V at 207 A peak impulse current, and features a 58 V reverse standoff voltage (VWM) with 64.4–71.2 V breakdown range. It meets RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 1–5 secondary lightning protection requirements.
For engineers reviewing the MPLAD18KP58A datasheet, MPLAD18KP58A pinout, MPLAD18KP58A application, or MPLAD18KP58A equivalent, this device is selected for high-reliability DC bus protection where low thermal resistance (RθJC = 0.7 °C/W), RoHS-compliant packaging, and multi-stroke lightning resilience are critical - especially in avionics power distribution and 24/48 V vehicle systems.
Technical Context
The MPLAD18KP58A operates as a silicon avalanche diode-based TVS, leveraging controlled breakdown conduction to shunt transients away from sensitive downstream circuitry. Its unidirectional polarity places the cathode on the metal base (package bottom), enabling direct thermal coupling to heatsinks or PCB copper planes for efficient dissipation of 18 kW pulses.
It is characterized under standardized 10/1000 μs double-exponential waveforms and supports multi-pulse operation at ≤0.05% duty factor. Clamping response time is <100 ps, and it complies with ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and pin-injection immunity per RTCA/DO-160F Waveform 4 and 5A across defined voltage classes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation in single-event or low-duty-cycle multi-stroke scenarios |
| Reverse Standoff Voltage (VWM) | 58 V - maximum continuous DC or peak AC voltage the device blocks during normal operation |
| Breakdown Voltage (V(BR)) | 64.4–71.2 V @ I(BR) - onset voltage for avalanche conduction, ensuring reliable turn-on before system damage thresholds |
| Max Clamping Voltage (VC) | 93.6 V @ 207 A IPP - limits voltage seen by protected ICs or MOSFETs during worst-case surge events |
| Thermal Resistance (RθJC) | 0.7 °C/W - enables effective heat transfer from junction to case, supporting high-power derating when mounted on heatsink |
| Standby Current (ID) | 10 μA @ 58 V - negligible leakage ensures no impact on system quiescent power or battery drain |
| Surge Rating Standard | RTCA DO-160F Waveform 4 Level 4 - validated for aircraft pin-injection immunity up to 6.4/69 μs at 25°C |
Pinout & Package
Package: PLAD (Plastic Leaded Anvil Device) - low-profile surface-mount package with metal base cathode termination, void-free UL94V-0 epoxy body, and matte-tin RoHS-compliant plating. Dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), weight ≈1 g. Cathode is electrically and thermally connected to the exposed metal base (bottom side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pad) | Transient Current Entry Point | Connected to protected line (e.g., +28 V DC bus); conducts surge current into device during overvoltage |
| Cathode (Metal Base) | Current Return Path & Thermal Interface | Electrically tied to ground or return plane; serves as primary thermal path to PCB copper or heatsink |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW Peak Pulse Power | Enables protection of high-voltage DC systems (e.g., 270 V aircraft buses) against lightning-induced surges without cascading failure |
| 0.7 °C/W Junction-to-Case Thermal Resistance | Allows >70% of rated PPP to be sustained with minimal temperature rise when mounted on ≥25 cm² 2-oz copper pad |
| RTCA DO-160F Waveform 4 Level 4 Compliance | Validated for pin-injection immunity in avionics equipment, eliminating need for external filtering in certified installations |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints - compatible with standard SMT reflow without baking |
| AEC-Q101 Qualified | Qualified for automotive underhood applications including load dump and alternator ripple suppression |
Applications
| Avionics Power Distribution | Automotive 24 V Load Dump Protection |
|---|---|
Use Scenario: Protecting 28 V DC power inputs in flight control computers and sensor interface modules against lightning-induced transients per DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to limit voltage excursion to <95 V during 10/1000 μs surges. Use Value: Eliminates need for series impedance or RC snubbers while maintaining compliance with Level 4 pin-injection requirements. | Use Scenario: Safeguarding engine control units (ECUs) and ADAS domain controllers during alternator load dump events (ISO 7637-2 Pulse 5a/b). IC Role / Device Role / Timing Role: Unidirectional TVS shunting surge current to chassis ground within <100 ps, clamping bus voltage to ≤93.6 V. Use Value: Prevents latch-up or gate oxide rupture in 40 V-rated power MOSFETs and CAN transceivers downstream. |
| Industrial 48 V DC Power Systems | Railway Signaling Power Inputs |
Use Scenario: Securing programmable logic controller (PLC) backplane power rails against switching transients from inductive solenoid loads. IC Role / Device Role / Timing Role: Fast-response clamping device placed upstream of DC-DC converters to prevent input overvoltage shutdown. Use Value: Maintains system uptime by absorbing repetitive 1–5 kW transients without parameter drift or wear-out. | Use Scenario: Protecting track-side signal processor power supplies from induced surges during nearby lightning strikes (IEC 61000-4-5 Class 4, 42 Ω source). IC Role / Device Role / Timing Role: Secondary lightning protector installed after primary gas discharge tube (GDT), limiting let-through voltage to safe levels. Use Value: Enables compact, maintenance-free protection architecture meeting EN 50121-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | 600 W PPP rating (vs. 18,000 W); SMA package; RθJC ≈ 40 °C/W | Only suitable for low-energy transients (e.g., ESD, microsecond spikes); cannot handle lightning or load dump | Select only for cost-sensitive consumer electronics where surge energy is <10 J. |
| SMCJ58A | 1500 W PPP rating; SMC package; RθJC ≈ 12 °C/W; same VWM/V(BR) range | Lacks RTCA DO-160F qualification and multi-stroke endurance; not rated for >100 A IPP | Acceptable for industrial automation where DO-160 or AEC-Q101 is not mandated. |
Compared with SMBJ58A and SMCJ58A, the MPLAD18KP58A provides 30× and 12× higher peak pulse power respectively, with superior thermal management and aviation-grade qualification - making it the sole choice for mission-critical surge paths requiring multi-kiloampere handling and regulatory compliance.
Availability
MPLAD18KP58A is available at Aetrix Electronics and suitable for avionics power distribution, automotive 24 V load dump protection, and industrial 48 V DC power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MPLAD18KP58A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, timing, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MPLAD18KP58A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load dump protection in safety-critical platforms where thermal robustness and regulatory certification are mandatory.
FAQ
What is the clamping voltage of the MPLAD18KP58A at its rated peak pulse current?
The MPLAD18KP58A has a maximum clamping voltage (VC) of 93.6 V at 207 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures downstream components see voltage limited below critical thresholds during surge events. The MPLAD18KP58A achieves this with sub-100 ps response time and minimal overshoot due to its low-inductance PLAD package layout.
Is the MPLAD18KP58A qualified for automotive applications?
Yes, the MPLAD18KP58A is AEC-Q101 qualified for automotive use. It meets stringent stress-test requirements including high-temperature operating life, temperature cycling, and surge robustness - making it suitable for under-hood ECUs, battery management systems, and ADAS power rails subjected to ISO 7637-2 load dump pulses. The MPLAD18KP58A's 58 V VWM aligns with 24 V system architectures, and its 18 kW rating exceeds typical load dump energy demands.
Does the MPLAD18KP58A require special PCB layout considerations?
Yes - optimal performance requires mounting the MPLAD18KP58A with its metal base soldered directly to a large, low-thermal-resistance copper area (≥25 cm², 2 oz copper) acting as both electrical return and heatsink. The anode pad must be kept short and wide to minimize inductance. Avoid thermal relief spokes on the cathode pad. Per datasheet RF01215 Rev B, the recommended pad layout ensures RθJC remains near 0.7 °C/W and prevents premature thermal runaway during multi-pulse events.
Can the MPLAD18KP58A be used in bidirectional configurations?
No - the MPLAD18KP58A is unidirectional only. Its part number suffix "A" (not "CA") confirms single-polarity construction. For bidirectional protection at 58 V standoff, the correct variant is MPLAD18KP58CA, which provides symmetrical clamping for AC-coupled or floating-bus applications. Using the MPLAD18KP58A in bidirectional circuits risks catastrophic failure during reverse-voltage transients.
What standards does the MPLAD18KP58A meet for lightning protection?
The MPLAD18KP58A meets RTCA DO-160F Section 22 lightning-induced transient requirements (Waveform 4 Level 4, 6.4/69 μs) and IEC 61000-4-5 secondary lightning protection (Class 1–5 with 42 Ω source, Class 1–4 with 12 Ω source). It is explicitly listed in the datasheet for these standards, unlike generic TVS diodes. The MPLAD18KP58A's 18 kW rating and low RθJC enable repeatable performance across multi-stroke test sequences required by aircraft certification.
MAPLAD18KP58A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 193A
- Power - Peak Pulse:
- 18000W (18kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PLAD
MAPLAD18KP58A FAQ
1.How can I place an order for MAPLAD18KP58A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP58A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAPLAD18KP58A reliable?
The price and inventory of MAPLAD18KP58A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP58A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP58A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP58A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP58A?
MAPLAD18KP58A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP58A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAPLAD18KP58A?
For technical support, including MAPLAD18KP58A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP58A requirements.
6.How does Aetrix verify that MAPLAD18KP58A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP58A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAPLAD18KP58A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP58A?
All MAPLAD18KP58A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP58A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAPLAD18KP58A part is unused and in its original packaging.
Return procedure for MAPLAD18KP58A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP58A Tags
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