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Microchip Technology MAPLAD36KP45A
- Part No.:
- MAPLAD36KP45A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:8,293
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Product details
Overview
MAPLAD36KP45A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power systems. It delivers 36 kW peak pulse power at 10/1000 μs, clamps at ≤72.7 V under 496 A peak impulse current, and features a 45 V reverse standoff voltage (VWM), 50–55.3 V breakdown voltage (V(BR)), and 1.0 °C/W junction-to-case thermal resistance - enabling robust secondary lightning protection per IEC 61000-4-5 and RTCA DO-160F Waveform 4 Level 4.
For engineers reviewing the MAPLAD36KP45A datasheet, MAPLAD36KP45A pinout, MAPLAD36KP45A application, or MAPLAD36KP45A equivalent, key selection criteria include its 45 V VWM rating, unidirectional polarity, low-profile PLAD package with metal-base cathode, and compliance with AEC-Q101 and MIL-PRF-19500 screening options - critical for avionics power rail hardening and load-dump suppression.
Technical Context
The MAPLAD36KP45A operates as a silicon avalanche diode-based TVS, leveraging controlled avalanche breakdown to clamp transients within nanoseconds. Its unidirectional construction isolates forward conduction path while providing precise reverse standoff (45 V) and tight V(BR) tolerance (50.0–55.3 V @ 5 mA).
Thermal design centers on direct metal-base heat sinking: RθJC = 1.0 °C/W enables effective dissipation of 36 kW pulses when mounted per recommended pad layout on FR4 with heatsink contact. It meets RTCA DO-160F Waveform 4 (6.4/69 μs) Level 4 and IEC 61000-4-5 Class 1–4 with 42 Ω source impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous operating voltage before clamping begins; sets minimum system rail margin for 48 V automotive/avionics applications. |
| V(BR) min/max | 50.0–55.3 V @ 5 mA - defines guaranteed avalanche onset range; ensures predictable turn-on without premature conduction. |
| VC @ IPP | 72.7 V @ 496 A - clamping voltage during full 10/1000 μs surge; limits downstream component stress below 75 V threshold. |
| PPP | 36,000 W @ 10/1000 μs - peak pulse power handling; supports multi-stroke lightning events per DO-160 Section 22. |
| RθJC | 1.0 °C/W - junction-to-case thermal resistance; requires direct metal-base mounting to heatsink for sustained pulse duty. |
| ID @ VWM | 10 μA max - standby leakage at 45 V; minimizes quiescent power loss in always-on protection circuits. |
| αV(BR) | 51 mV/°C - temperature coefficient of breakdown voltage; enables accurate derating over -55°C to +150°C operating range. |
Pinout & Package
MAPLAD36KP45A uses the PLAD surface-mount package: void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.08 mm), matte-tin plated terminals, and metal base acting as cathode terminal. Mounting requires thermal pad contact to PCB copper pour or external heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Metal Base (Bottom) | Cathode | Primary heat path and high-current return node; must be soldered to thermal pad for RθJC = 1.0 °C/W performance. |
| Top Anode Pad | Anode | Signal/power input node; connects to protected line (e.g., 48 V bus); polarity marking on top surface. |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW Peak Pulse Power | Enables single-device compliance with RTCA DO-160F Section 22 multi-stroke lightning testing without parallel stacking. |
| 1.0 °C/W Junction-to-Case Thermal Resistance | Allows >90% of surge energy to transfer directly from die to heatsink, preventing thermal runaway during repetitive surges. |
| AEC-Q101 Qualified | Validated for automotive under-hood environments including temperature cycling, mechanical shock, and humidity exposure. |
| RoHS Compliant (e3) | Tin-plated terminals meet lead-free reflow profiles up to 260°C for 10 seconds without degradation. |
| Level 1 Moisture Sensitivity | No dry-pack or baking required prior to assembly - reduces manufacturing overhead and avoids moisture-induced popcorning. |
Applications
| Avionics Power Distribution | Automotive 48 V Mild Hybrid Systems |
|---|---|
Use Scenario: Protecting 28 V DC distribution buses in commercial aircraft against induced lightning transients per RTCA DO-160F Waveform 4 Level 4. IC Role / Device Role / Timing Role: Unidirectional TVS placed at bus entry point to clamp surges before reaching upstream converters and avionics LRUs. Use Value: 72.7 V clamping ensures downstream 100 V-rated MOSFETs and controllers remain within safe SOA during 6.4/69 μs pin-injection events. | Use Scenario: Safeguarding 48 V battery management and DC-DC converter inputs against load dump spikes in 48 V mild hybrid vehicles. IC Role / Device Role / Timing Role: Primary surge suppression device on main 48 V rail, coordinated with slower fuses to handle 12 V–48 V transition surges. Use Value: 45 V VWM matches nominal 48 V system with 10% margin; 36 kW rating absorbs ISO 16750-2 Pulse 5b without degradation over 100,000 cycles. |
| Industrial Motor Drive DC Link | Railway Signaling Power Supplies |
Use Scenario: Clamping switching transients on 40–60 V DC link rails of servo drives subjected to IGBT commutation noise and inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS across DC+ and DC− to limit dV/dt-induced gate driver failures and capacitor overvoltage. Use Value: Sub-5 ns response time and 1.0 °C/W thermal path prevent cumulative heating during high-frequency PWM operation. | Use Scenario: Secondary lightning protection for 48 V signaling power supplies in trackside cabinets exposed to indirect lightning coupling. IC Role / Device Role / Timing Role: Final-stage TVS after primary gas discharge tube (GDT), absorbing residual energy per IEC 61000-4-5 Class 4 (42 Ω source). Use Value: 72.7 V clamping holds rail voltage below 80 V threshold for EN 50121-3-2 compliant 48 V DC/DC modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | 600 W PPP rating, DO-214AA package, RθJC ≈ 35 °C/W, VWM = 45 V, VC = 72.7 V @ 8.3 A | Lower energy handling; suitable only for single-event ESD/EFT, not multi-stroke lightning or load dump. | Select SMBJ45A only for cost-sensitive consumer-grade designs where surge repetition and peak power are low. |
| SMCJ45A | 1500 W PPP rating, DO-214AB package, RθJC ≈ 15 °C/W, VWM = 45 V, VC = 72.7 V @ 21.5 A | Lacks AEC-Q101 qualification and DO-160F validation; limited to industrial non-avionics use. | Choose SMCJ45A for general-purpose industrial 48 V rail protection where certification traceability is not required. |
Compared with SMBJ45A and SMCJ45A, MAPLAD36KP45A provides 24× and 24× higher peak pulse power respectively, validated thermal performance for repeated surges, and full DO-160F/IEC 61000-4-5 compliance - making it the only option for certified aerospace and high-reliability automotive applications.
Availability
MAPLAD36KP45A is available at Aetrix Electronics and suitable for avionics power distribution, automotive 48 V mild hybrid systems, and industrial motor drive DC link protection requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD36KP45A 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 components for aerospace, defense, and industrial markets.
The MAPLAD36KP45A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load-dump protection in safety-critical platforms where multi-stroke surge endurance and thermal stability are mandatory.
FAQ
What is the maximum clamping voltage of MAPLAD36KP45A under rated surge conditions?
The MAPLAD36KP45A exhibits a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 496 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The clamping performance remains stable across its full operating temperature range of –55°C to +150°C.
Does MAPLAD36KP45A require heatsinking, and if so, how is it implemented?
Yes, MAPLAD36KP45A requires direct thermal coupling to a heatsink or large PCB copper area via its metal base (cathode). Its 1.0 °C/W junction-to-case thermal resistance is only achievable when the base is soldered to a thermally optimized pad layout per the datasheet's recommended footprint. Without this, RθJA rises to 50 °C/W, severely limiting repeatable surge capability and risking thermal failure during multi-pulse events.
Is MAPLAD36KP45A qualified for automotive applications, and what standards does it meet?
Yes, MAPLAD36KP45A is AEC-Q101 qualified for automotive use and validated for harsh-environment reliability. It meets RTCA DO-160F Section 22 lightning test requirements (Waveform 4 Level 4), IEC 61000-4-5 Class 1–4 (42 Ω source), and ESD/EFT immunity per IEC 61000-4-2/4-4. These certifications confirm suitability for 48 V mild hybrid vehicle power systems and under-hood ECUs where long-term surge endurance is critical.
How does the unidirectional configuration of MAPLAD36KP45A affect circuit placement and polarity awareness?
The unidirectional configuration of MAPLAD36KP45A mandates correct orientation: its metal base is the cathode and must connect to the lower-potential side (e.g., ground or return rail), while the top anode pad connects to the protected line. Reversal causes forward conduction and catastrophic failure at normal operating voltage. Polarity is marked on the top surface, and the device cannot substitute for bidirectional variants like MAPLAD36KP45CA in AC-coupled or floating-rail applications.
What packaging and moisture sensitivity level applies to MAPLAD36KP45A?
MAPLAD36KP45A is supplied in bulk or tape-and-reel (add "TR" suffix) per EIA-481-B, with RoHS-compliant matte-tin plating (e3 marking). It carries IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1 - meaning no dry-packaging or baking is required prior to reflow soldering, even after indefinite ambient storage. This simplifies manufacturing logistics and eliminates moisture-related assembly defects.
MAPLAD36KP45A 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 496A
- 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
MAPLAD36KP45A FAQ
1.How can I place an order for MAPLAD36KP45A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP45A 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 MAPLAD36KP45A reliable?
The price and inventory of MAPLAD36KP45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP45A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP45A?
MAPLAD36KP45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP45A 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 MAPLAD36KP45A?
For technical support, including MAPLAD36KP45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP45A requirements.
6.How does Aetrix verify that MAPLAD36KP45A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP45A 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 MAPLAD36KP45A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP45A?
All MAPLAD36KP45A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP45A, 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 MAPLAD36KP45A part is unused and in its original packaging.
Return procedure for MAPLAD36KP45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP45A Tags
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