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Microchip Technology MAPLAD36KP18A
- Part No.:
- MAPLAD36KP18A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP18A.pdf
- Description:
- TVS DIODE 18VWM 30.8VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,978
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Product details
Overview
MAPLAD36KP18A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps at ≤30.8 V under 1169 A peak impulse current, and features 18 V reverse standoff voltage (VWM) with 20.0–22.1 V breakdown voltage (V(BR)). It meets RTCA DO-160 Section 22 multi-stroke lightning requirements and IEC 61000-4-5 Class 1–5 secondary lightning protection.
For engineers reviewing the MAPLAD36KP18A datasheet, MAPLAD36KP18A pinout, MAPLAD36KP18A application, or MAPLAD36KP18A equivalent, key selection criteria include its 18 V VWM rating, 30.8 V max clamping voltage at 1169 A, low thermal resistance (RθJC = 1.0 °C/W), RoHS-compliant e3 plating, and qualification to AEC-Q101 and MIL-PRF-19500 screening levels.
Technical Context
The MAPLAD36KP18A employs an avalanche diode structure optimized for fast response (<100 ps rise time) and high-energy absorption in unidirectional configuration. Its metal-base cathode construction enables direct thermal coupling to PCB copper or heatsinks, supporting sustained surge handling under 0.05% duty cycle per Figure 1 and 2.
It operates across –55°C to +150°C junction temperature range and complies with IEC 61000-4-2 ESD (±30 kV contact), IEC 61000-4-4 EFT (40 A), and RTCA/DO-160F Waveform 4 (Level 4 up to 400 V VWM) and Waveform 5A (Level 4 up to 78 V VWM) pin injection standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous operating voltage before clamping begins; matches 15–18 V DC bus systems. |
| V(BR) min/max | 20.0–22.1 V - Confirmed breakdown threshold at 5 mA; ensures reliable turn-on above nominal rail. |
| VC @ IPP | 30.8 V max at 1169 A - Clamping voltage limits downstream IC stress during 10/1000 μs transients. |
| PPP | 36,000 W @ 10/1000 μs - Sustains aircraft lightning-induced surges without failure. |
| RθJC | 1.0 °C/W - Enables efficient heat transfer from junction to case; requires minimal external heatsinking. |
| ID @ VWM | 60 μA max - Ultra-low leakage preserves battery life in always-on avionics subsystems. |
| Package | PLAD - Surface-mount thermoset epoxy body (UL94V-0), metal base cathode for thermal conduction. |
Pinout & Package
MAPLAD36KP18A uses the PLAD package: void-free transfer-molded thermosetting epoxy body (UL94V-0), tin-lead or RoHS-compliant matte-tin plating, and metal base serving as cathode terminal. Dimensions: 12.32–12.57 mm × 10.54–10.80 mm × 3.68–3.94 mm (L×W×H). Polarity marked on body; cathode is entire metal bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary current return path and thermal interface; must be soldered to large copper pour or heatsink. |
| Top Surface Pad | Anode | Signal-side connection; routed to protected line (e.g., 18 V power rail or data line). |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW Peak Pulse Power | Enables single-device protection against RTCA DO-160 Section 22 multi-stroke lightning events without cascaded TVS stages. |
| 1.0 °C/W Junction-to-Case Thermal Resistance | Allows >2.5 W steady-state dissipation at TA=25°C with minimal board area, reducing need for auxiliary cooling. |
| AEC-Q101 Qualified | Validated for automotive load dump and ISO 7637-2 compliance in engine control and ADAS modules. |
| RoHS Compliant (e3) | Meets global environmental regulations without compromising surge performance or thermal reliability. |
| Level 1 Moisture Sensitivity | Eliminates dry-pack requirement and floor-life constraints, simplifying SMT assembly logistics. |
Applications
| Aerospace Power Distribution | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 18 V avionics bus from lightning-induced transients during flight per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point of flight management computer. Use Value: Limits transient overvoltage to ≤30.8 V, preventing latch-up or damage to downstream 28 V tolerant regulators and FPGAs. | Use Scenario: Safeguarding 12–18 V supply rails in diesel ECU against ISO 7637-2 load dump pulses (up to 120 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at ECU power connector input. Use Value: Absorbs 36 kW energy within 1 ms, eliminating need for series resistors or additional filtering stages. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: Secondary protection on 24 V DC bus feeding servo drives exposed to switching transients from IGBT inverters. IC Role / Device Role / Timing Role: Fast-response clamping element parallel to bulk capacitance at drive input stage. Use Value: Responds in <100 ps to suppress dv/dt spikes, maintaining gate driver integrity during regenerative braking events. | Use Scenario: Shielding 18 V signaling lines in European railway ETCS Level 2 balise interfaces from induced RFI and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (used with companion device) on CAN or MVB physical layer. Use Value: Withstands 40 A EFT per IEC 61000-4-4 and 10 kV ESD per IEC 61000-4-2 without degradation over 100,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18A | Lower PPP (400 W), smaller SMA package, 30.6 V VC @ 12.9 A - not suitable for lightning-level surges. | Targeted at consumer electronics ESD protection, not aerospace or automotive load dump. | Select only for cost-sensitive, low-energy applications where 36 kW capability is unnecessary. |
| Vishay VMM18 | Same PLAD package, 30 kW PPP, 31.8 V VC @ 950 A - 17% lower energy rating than MAPLAD36KP18A. | Qualified to AEC-Q101 but lacks RTCA DO-160F Waveform 4/5A certification data. | Acceptable for automotive use where full DO-160 compliance is not mandated. |
Compared with SMAJ18A and VMM18, MAPLAD36KP18A provides 90× higher peak pulse power and DO-160F-certified pin injection immunity-critical for flight-critical systems where single-point failure is unacceptable.
Availability
MAPLAD36KP18A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive ECU protection, and industrial motor drive DC bus applications requiring stable component supply, long-term lifecycle support, and traceable high-reliability sourcing.
Supply support for MAPLAD36KP18A 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) designs high-reliability analog, mixed-signal, and power semiconductors for aerospace, defense, and industrial markets.
The MAPLAD36KP18A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for lightning and load dump protection in safety-critical platforms where thermal robustness and multi-stroke endurance are mandatory.
FAQ
What is the maximum clamping voltage of the MAPLAD36KP18A under standard test conditions?
The MAPLAD36KP18A has a maximum clamping voltage (VC) of 30.8 V when subjected to its rated peak pulse current of 1169 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and ensures downstream circuitry remains within safe operating voltage limits during surge events.
Is the MAPLAD36KP18A qualified for automotive applications?
Yes, the MAPLAD36KP18A is qualified to AEC-Q101 for automotive use and supports ISO 7637-2 load dump protection. Its 18 V VWM and 30.8 V clamping voltage align with 12 V/24 V vehicle electrical systems, and its thermal design (RθJC = 1.0 °C/W) sustains repeated surges in under-hood environments.
Does the MAPLAD36KP18A require special PCB layout considerations?
Yes - the metal base is the cathode and must be soldered to a large copper pour or heatsink for thermal management. The recommended pad layout (Ref. A=11.94 mm, B=5.85 mm) ensures mechanical stability and optimal heat dissipation. Avoid narrow traces between anode pad and protected line to preserve low-inductance surge path.
Can the MAPLAD36KP18A be used for bidirectional protection?
No - MAPLAD36KP18A is unidirectional only. For bidirectional operation, select MAPLAD36KP18CA (CA suffix). The CA variant provides symmetrical clamping for AC-coupled or floating signal lines, while MAPLAD36KP18A is intended for DC rail protection with defined polarity.
What certifications does the MAPLAD36KP18A meet for aerospace use?
The MAPLAD36KP18A meets RTCA DO-160 Section 22 for multi-stroke lightning, IEC 61000-4-5 Class 1–5 secondary lightning (with 2/12/42 Ω source impedance), and IEC 61000-4-2/4-4 for ESD/EFT. It is also moisture sensitivity Level 1 (no dry pack required) and UL94V-0 flame-rated.
MAPLAD36KP18A 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 30.8V
- Current - Peak Pulse (10/1000µs):
- 1169A (1.169kA)
- Power - Peak Pulse:
- 36000W (36kW)
- 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
MAPLAD36KP18A FAQ
1.How can I place an order for MAPLAD36KP18A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP18A 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 MAPLAD36KP18A reliable?
The price and inventory of MAPLAD36KP18A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP18A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP18A?
MAPLAD36KP18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP18A 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 MAPLAD36KP18A?
For technical support, including MAPLAD36KP18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP18A requirements.
6.How does Aetrix verify that MAPLAD36KP18A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP18A 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 MAPLAD36KP18A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP18A?
All MAPLAD36KP18A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP18A, 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 MAPLAD36KP18A part is unused and in its original packaging.
Return procedure for MAPLAD36KP18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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