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Microchip Technology MAPLAD36KP78AE3
- Part No.:
- MAPLAD36KP78AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP78AE3.pdf
- Description:
- TVS DIODE 78VWM 126VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:9,882
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Product details
Overview
MAPLAD36KP78AE3 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 ≤126 V under 286 A peak impulse current, and features a 78 V reverse standoff voltage (VWM), 86.7–95.8 V breakdown voltage (V(BR)), and 1.0 °C/W junction-to-case thermal resistance.
For engineers reviewing the MAPLAD36KP78AE3 datasheet, MAPLAD36KP78AE3 pinout, MAPLAD36KP78AE3 application, or MAPLAD36KP78AE3 equivalent, this device is selected for lightning protection per RTCA DO-160 Section 22, load dump suppression, and secondary IEC 61000-4-5 compliance with 42 Ω, 12 Ω, and 2 Ω source impedances - requiring precise VWM margining, thermal management on FR4, and polarity-aware PCB layout.
Technical Context
This TVS operates as a silicon avalanche diode with unidirectional polarity, where the cathode is the metal base (package bottom). Its low RθJC (1.0 °C/W) enables effective heat transfer to the PCB copper pad, and its <100 ps response time ensures sub-nanosecond clamping onset during fast transients like ESD or pin injection waveforms (DO-160F Waveform 4 & 5A).
It meets AEC-Q101 stress testing requirements and supports MIL-PRF-19500 upscreening options. Electrical behavior is defined by VWM ≥ system peak operating voltage, with VC = 126 V @ IPP = 286 A (10/1000 μs), ID ≤ 10 μA at 78 V, and αV(BR) = 95 mV/°C - enabling predictable temperature-dependent clamping across –55°C to +150°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains multi-stroke lightning surges without degradation when mounted per recommended pad layout |
| Reverse Standoff Voltage (VWM) | 78 V - maximum continuous DC or peak AC voltage the device blocks before entering avalanche conduction |
| Breakdown Voltage (V(BR)) | 86.7–95.8 V @ 5 mA - defines minimum clamping threshold onset; used to verify margin over VWM |
| Clamping Voltage (VC) | 126 V @ 286 A (10/1000 μs) - maximum voltage seen by protected circuit during worst-case surge |
| Thermal Resistance (RθJC) | 1.0 °C/W - enables direct thermal path from die to PCB copper, critical for sustained surge duty cycles |
| Standby Current (ID) | ≤10 μA @ 78 V - ensures negligible leakage in standby, preserving battery-backed or low-power circuits |
| Temperature Coefficient (αV(BR)) | 95 mV/°C - quantifies V(BR) drift with junction temperature; used for derating at elevated ambient |
Pinout & Package
MAPLAD36KP78AE3 uses a surface-mount PLAD package (void-free UL94V-0 epoxy body) with two terminals: anode and cathode. The cathode is the exposed metal base (bottom side), requiring correct orientation during placement. Thermal performance depends on soldering to a large copper pad per specified layout (A = 0.470", B = 0.230", C = 0.100").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for unidirectional conduction | Connected to protected line; conducts only when cathode voltage exceeds anode by ≥V(BR) |
| Cathode | Negative terminal / heat sink interface | Exposed metal base - must be soldered to thermal pad; serves as primary heat dissipation path |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW surge rating | Validated for multi-stroke lightning (RTCA DO-160 Section 22) and automotive load dump without parametric shift |
| Low-profile SMT PLAD package | Enables high-density board layout while delivering 1.0 °C/W RθJC - superior to TO-277 or SMB packages |
| RoHS-compliant e3 plating | Matte-tin termination meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity - no dry pack required |
| AEC-Q101 qualified | Passes stress tests including HTGB, HTRB, and TCT - suitable for automotive under-hood applications |
| IEC 61000-4-5 compliance | Rated for Class 1–5 secondary lightning protection with 42 Ω, 12 Ω, and 2 Ω source impedances |
Applications
| Aerospace Avionics Protection | Automotive Power Distribution |
|---|---|
Use Scenario: Protecting ARINC 429 data lines and sensor inputs in commercial aircraft against DO-160F Waveform 4 (6.4/69 μs) and Waveform 5A (40/120 μs) pin injection transients. IC Role / Device Role / Timing Role: Primary transient shunt - placed directly at connector entry point to clamp energy before reaching downstream ASICs or FPGAs. Use Value: Enables Level 4/5 compliance with VWM = 78 V matching 28 V aircraft bus peaks, and 126 V clamping limiting stress on 100 V-rated receivers. | Use Scenario: Safeguarding 12 V/24 V power rails in engine control units (ECUs) and body control modules (BCMs) during ISO 7637-2 load dump events. IC Role / Device Role / Timing Role: High-energy crowbar - absorbs >300 A surge currents with sub-100 ps response, preventing latch-up in PMICs and microcontrollers. Use Value: 36 kW rating and 1.0 °C/W RθJC allow single-device protection without heatsinks, reducing BOM count versus stacked TVS arrays. |
| Industrial Motor Drive Inputs | Railway Signaling Interfaces |
Use Scenario: Shielding PLC analog input channels and encoder feedback lines from inductive kickback and EFT bursts in factory automation systems. IC Role / Device Role / Timing Role: Fast-response voltage clamp - placed adjacent to connectors to suppress 4 kV EFT (IEC 61000-4-4) and 2 kV ESD (IEC 61000-4-2) events. Use Value: 10 μA ID at 78 V prevents signal offset in 24 V loop-powered sensors; 126 V VC ensures compatibility with 150 V-rated op-amps. | Use Scenario: Securing track-side signaling interfaces (e.g., ETCS Level 1 balise readers) against induced surges from nearby traction currents and lightning coupling. IC Role / Device Role / Timing Role: Secondary lightning protector - installed after gas discharge tube (GDT) front-end to handle residual energy per IEC 61000-4-5 with 42 Ω source impedance. Use Value: Supports Class 5 protection at long-distance configurations (VWM = 78 V → MPLAD36KP78A valid per spec table), ensuring fail-safe operation in EN 50121-4 environments. |
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, 5.0 mm × 3.5 mm SMB package, RθJA = 40 °C/W, VC = 121 V @ 43.5 A | Limited to single-stroke surges; unsuitable for DO-160 multi-stroke or automotive load dump | Select SMBJ78A only for cost-sensitive consumer electronics with low-energy transients and no thermal constraints. |
| SMCJ78A | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJA = 25 °C/W, VC = 121 V @ 123 A | Insufficient for 36 kW lightning; requires parallel devices to approach MAPLAD36KP78AE3 capability | Choose SMCJ78A for industrial controls needing higher energy than SMB but lacking aerospace-grade reliability or thermal performance. |
Compared with SMBJ78A and SMCJ78A, MAPLAD36KP78AE3 provides 24× and 24× higher peak pulse power respectively, integrated thermal design eliminating external heatsinking, and qualification for mission-critical aerospace surge standards - making it the sole option for DO-160 Section 22 compliance and high-reliability load dump protection.
Availability
MAPLAD36KP78AE3 is available at Aetrix Electronics and suitable for aerospace avionics, automotive power distribution, and industrial motor drive applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-critical designs.
Supply support for MAPLAD36KP78AE3 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-hardened ICs for aerospace, defense, and industrial markets.
The PLAD-series TVS family was engineered specifically for high-energy, multi-stroke surge environments - prioritizing thermal robustness, AEC-Q101 and DO-160 qualification, and low-inductance SMT packaging for aircraft and vehicle subsystems.
FAQ
What is the clamping voltage of MAPLAD36KP78AE3 under full-rated surge conditions?
The clamping voltage (VC) of MAPLAD36KP78AE3 is 126 V when subjected to its rated peak pulse current of 286 A at the 10/1000 μs waveform. This value is the maximum voltage measured across the device during surge conduction and defines the upper voltage limit imposed on the protected circuit. MAPLAD36KP78AE3 maintains this clamping performance across its operational temperature range when mounted per the specified thermal pad layout.
How does the PLAD package of MAPLAD36KP78AE3 improve thermal performance compared to standard SMC or SMB TVS diodes?
The PLAD package of MAPLAD36KP78AE3 achieves a junction-to-case thermal resistance (RθJC) of just 1.0 °C/W - significantly lower than typical SMC (≈3.5 °C/W) or SMB (≈10 °C/W) packages. This is accomplished via a large exposed metal cathode base that forms a direct thermal path to the PCB copper pad. MAPLAD36KP78AE3 thus dissipates surge energy more efficiently, enabling reliable multi-stroke operation without external heatsinks.
Is MAPLAD36KP78AE3 compliant with RTCA DO-160F Section 22 for lightning-induced transient protection?
Yes, MAPLAD36KP78AE3 is explicitly validated for RTCA DO-160F Section 22 multi-stroke lightning testing. Its 36 kW peak pulse power rating, sub-100 ps response time, and ability to withstand repeated 10/1000 μs surges make it suitable for primary and secondary lightning protection zones in aircraft avionics. MAPLAD36KP78AE3 is listed in the specification for Level 4 and Level 5 pin injection protection using Waveform 4 and Waveform 5A.
What is the polarity configuration and mounting orientation requirement for MAPLAD36KP78AE3?
MAPLAD36KP78AE3 is a unidirectional TVS diode with cathode on the exposed metal base (bottom side of the package). During PCB layout, the cathode must be connected to the system ground or lowest potential reference plane, and the anode to the line being protected. Incorrect orientation will prevent proper clamping. The polarity symbol is marked on the top surface for unidirectional versions, and MAPLAD36KP78AE3 must be placed with the marked side up and cathode base fully soldered to the thermal pad.
Does MAPLAD36KP78AE3 meet automotive qualification standards such as AEC-Q101?
Yes, MAPLAD36KP78AE3 is tested and qualified to AEC-Q101 Rev D for discrete semiconductors. It passes all required stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), temperature cycling (TCT), and mechanical shock - confirming suitability for under-hood automotive applications. This qualification is documented in Microsemi's reliability reports and applies to the full PLAD series, including MAPLAD36KP78AE3.
MAPLAD36KP78AE3 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
MAPLAD36KP78AE3 FAQ
1.How can I place an order for MAPLAD36KP78AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP78AE3 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 MAPLAD36KP78AE3 reliable?
The price and inventory of MAPLAD36KP78AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP78AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP78AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP78AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP78AE3?
MAPLAD36KP78AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP78AE3 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 MAPLAD36KP78AE3?
For technical support, including MAPLAD36KP78AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP78AE3 requirements.
6.How does Aetrix verify that MAPLAD36KP78AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP78AE3 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 MAPLAD36KP78AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP78AE3?
All MAPLAD36KP78AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP78AE3, 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 MAPLAD36KP78AE3 part is unused and in its original packaging.
Return procedure for MAPLAD36KP78AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP78AE3 Tags
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