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Microchip Technology MAPLAD36KP78A
- Part No.:
- MAPLAD36KP78A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP78A.pdf
- Description:
- TVS DIODE 78VWM 126VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
MAPLAD36KP78A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) rated for 36 kW peak pulse power at 10/1000 μs, with 78 V reverse standoff voltage (VWM), 86.7–95.8 V breakdown voltage (V(BR)), and 126 V maximum clamping voltage (VC) at 286 A peak pulse current. It delivers high-reliability lightning and load dump protection in aerospace avionics meeting RTCA DO-160 Section 22.
For engineers reviewing the MAPLAD36KP78A datasheet, MAPLAD36KP78A pinout, MAPLAD36KP78A application, or MAPLAD36KP78A equivalent, this part supports critical secondary lightning protection per IEC 61000-4-5 (42 Ω, 12 Ω, 2 Ω source impedances), pin injection protection per RTCA/DO-160F Waveform 4 (Level 4) and Waveform 5A (Level 4), and AEC-Q101 qualified surge immunity.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with metal-base cathode construction enabling low thermal resistance (RθJC = 1.0 °C/W) and efficient heat dissipation into PCB copper. Its design targets multi-stroke lightning transients and automotive load dump events where fast response (<100 ps rise time) and stable clamping under repetitive surges (≤0.05% duty factor) are essential.
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) standards, and is validated for RTCA DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) pin injection testing-enabling use in flight-critical avionics interfaces without external series impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains full-rated surge energy without degradation under single or low-duty-cycle multi-stroke events |
| Reverse Standoff Voltage (VWM) | 78 V - maximum continuous operating voltage before clamping begins; matches 72 V nominal aircraft bus systems |
| Clamping Voltage (VC) | 126 V @ 286 A - limits downstream circuit voltage to safe level during worst-case surge, enabling robust IC-level protection |
| Breakdown Voltage (V(BR)) | 86.7–95.8 V @ 5 mA - defines precise turn-on threshold ensuring reliable activation above system operating voltage |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables direct thermal coupling to heatsink or large copper pour for sustained surge handling |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack or bake required prior to reflow, simplifying SMT assembly |
| RoHS Compliance | e3 marking - lead-free matte tin plating compatible with standard Pb-free reflow profiles |
Pinout & Package
MAPLAD36KP78A uses a surface-mount PLAD package (12.32 × 10.54 × 5.33 mm) with metal base acting as cathode terminal and top-side anode pad. The low-profile void-free epoxy body meets UL94V-0 and supports high-current solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and return path for surge current; must be connected to large copper area or heatsink |
| Top Pad (Anode) | Anode | Input connection point for protected line; polarity-marked on unidirectional variants |
Key Features
| Feature | Design Value |
|---|---|
| High-reliability wafer lot traceability | Full fabrication and assembly lot tracking per MIL-PRF-19500 upscreening options available for aerospace programs |
| RTCA DO-160F Waveform 4 compliance | Rated for Level 4 pin injection (6.4/69 μs) up to 400 V VWM - protects avionics data buses without external filtering |
| IEC 61000-4-5 secondary lightning protection | Validated across 42 Ω, 12 Ω, and 2 Ω source impedances - covers both short- and long-distance surge coupling scenarios |
| Low thermal resistance junction-to-case | RθJC = 1.0 °C/W - enables >90% of surge energy to be conducted away from silicon die, improving multi-pulse endurance |
| AEC-Q101 qualification | Stress-tested for automotive-grade reliability including temperature cycling, HTRB, and surge life - suitable for engine control and ADAS modules |
Applications
| Avionics Power Bus Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC aircraft power distribution networks against lightning-induced transients per RTCA DO-160 Section 22. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point to limit bus voltage excursion during multi-stroke events. Use Value: Enables compliance with Level 4 Waveform 4 pin injection (6.4/69 μs) without additional RC filtering, reducing BOM count and board space. | Use Scenario: Safeguarding 12 V/24 V automotive ECU microcontrollers and CAN transceivers from load dump surges up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp transients within 100 ps. Use Value: Withstands 36 kW pulses while maintaining clamping voltage ≤126 V, preventing brownout or latch-up in sensitive logic circuits. |
| Industrial Motor Drive DC Link | Railway Signaling Interface |
Use Scenario: Suppressing switching transients on 75–100 V DC link rails in variable-frequency drives subjected to IEC 61000-4-5 Class 4 surges. IC Role / Device Role / Timing Role: Secondary surge limiter mounted directly on DC bus capacitor terminals to absorb commutation spikes. Use Value: 1.0 °C/W RθJC allows direct mounting to aluminum heatsink, sustaining repeated 286 A surges without thermal runaway. | Use Scenario: Protecting 72 V signaling lines in European railway interlocking systems against induced surges per EN 50121-4. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MAPLAD36KP78CA) used on differential track circuits to handle polarity-reversal transients. Use Value: Validated for 2 Ω source impedance Class 4 testing (130 V VWM max), ensuring compatibility with legacy signaling infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78A | 600 W PPP rating, SMA package, 1.5x higher RθJA (50 °C/W), no DO-160 qualification | Limited to commercial-grade industrial controls; insufficient for multi-stroke lightning or avionics | Select only for cost-sensitive non-aerospace designs with single-event surge exposure |
| SMCJ78A | 1500 W PPP rating, SMC package, 3x lower clamping ratio (VC/VWM ≈ 1.5 vs. 1.61), no AEC-Q101 or DO-160 data | Suitable for basic automotive load dump but not certified for flight-critical systems | Use where IEC 61000-4-5 Class 3 compliance suffices and multi-pulse endurance is not required |
Compared with SMBJ78A and SMCJ78A, MAPLAD36KP78A delivers 24× and 24× higher peak pulse power respectively, validated RTCA DO-160F and AEC-Q101 qualification, and 50× lower thermal resistance-making it the only option for high-reliability, multi-stroke, aviation-grade surge protection.
Availability
MAPLAD36KP78A is available at Aetrix Electronics and suitable for avionics power bus protection, automotive ECU surge hardening, and industrial motor drive DC link stabilization requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD36KP78A 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-tolerant solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP78A belongs to Microsemi's high-power PLAD-series TVS family, engineered specifically for multi-stroke lightning protection in safety-critical avionics and harsh-environment automotive systems.
FAQ
What is the clamping voltage of MAPLAD36KP78A at its rated peak pulse current?
The MAPLAD36KP78A has a maximum clamping voltage (VC) of 126 V at 286 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that downstream circuitry remains below 126 V during worst-case surge events, preserving functionality of 100 V-rated components.
Is MAPLAD36KP78A qualified for automotive applications?
Yes, MAPLAD36KP78A is AEC-Q101 qualified and tested for automotive-grade reliability including temperature cycling, high-temperature reverse bias, and surge life. It is designed for engine control units, battery management systems, and ADAS modules exposed to ISO 7637-2 and SAE J1113-11 load dump transients.
Does MAPLAD36KP78A meet RTCA DO-160F lightning test requirements?
Yes, MAPLAD36KP78A is validated for RTCA DO-160F Section 22 lightning-induced transient susceptibility, including Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 pin injection testing. Its 36 kW rating and low clamping ratio ensure compliance without auxiliary filtering.
What is the thermal resistance and recommended mounting method for MAPLAD36KP78A?
MAPLAD36KP78A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W. The metal base must be soldered to a minimum 1.5 cm² copper pour or attached to an external heatsink using thermally conductive adhesive or screw mounting to maintain safe junction temperatures during repetitive surges.
How does MAPLAD36KP78A differ from standard SMBJ or SMCJ series TVS diodes?
MAPLAD36KP78A delivers 36 kW peak pulse power-24× higher than SMBJ78A (600 W) and SMCJ78A (1500 W)-with 1.0 °C/W RθJC versus ~50 °C/W for those packages. It is also uniquely qualified for RTCA DO-160F and AEC-Q101, whereas SMBJ/SMCJ parts lack formal certification for multi-stroke lightning or automotive stress testing.
MAPLAD36KP78A 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):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 286A
- 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
MAPLAD36KP78A FAQ
1.How can I place an order for MAPLAD36KP78A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP78A 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 MAPLAD36KP78A reliable?
The price and inventory of MAPLAD36KP78A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP78A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP78A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP78A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP78A?
MAPLAD36KP78A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP78A 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 MAPLAD36KP78A?
For technical support, including MAPLAD36KP78A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP78A requirements.
6.How does Aetrix verify that MAPLAD36KP78A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP78A 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 MAPLAD36KP78A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP78A?
All MAPLAD36KP78A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP78A, 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 MAPLAD36KP78A part is unused and in its original packaging.
Return procedure for MAPLAD36KP78A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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