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Microchip Technology MAPLAD18KP33AE3
- Part No.:
- MAPLAD18KP33AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP33AE3.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,906
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Product details
Overview
MAPLAD18KP33AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive power systems. It delivers 18,000 W peak pulse power at 10/1000 μs, features a 33 V reverse standoff voltage (VWM), clamps to ≤53.3 V at 338 A peak impulse current (IPP), and exhibits 0.7 °C/W junction-to-case thermal resistance for efficient heat dissipation in lightning and load-dump protection circuits.
For engineers reviewing the MAPLAD18KP33AE3 datasheet, MAPLAD18KP33AE3 pinout, MAPLAD18KP33AE3 application, or MAPLAD18KP33AE3 equivalent, key selection criteria include its DO-160F Waveform 4 Level 4 compliance, IEC 61000-4-5 Class 1–5 secondary lightning protection capability with 42 Ω source impedance, and RoHS-compliant e3 matte-tin plating suitable for lead-free reflow assembly.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive electronics, activating above its 33 V working standoff voltage to divert transients away from downstream circuitry. Its low 0.7 °C/W RθJC enables direct mounting onto metal-core PCBs or heatsinks, supporting sustained multi-stroke surge handling per RTCA DO-160 Section 22.
The device meets AEC-Q101 stress testing requirements and supports MIL-PRF-19500 upscreening options. Its bidirectional variants (e.g., MAPLAD18KP33CAE3) share identical PPP and IPP ratings but differ in polarity configuration and clamping symmetry-critical for AC-coupled or differential signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 18,000 W @ 10/1000 μs - sustains aircraft-grade lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 33 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Clamping Voltage (VC) | 53.3 V @ 338 A IPP - limits downstream voltage stress during worst-case transients |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables direct thermal coupling to heatsink for cumulative stroke reliability |
| Surge Current (IPP) | 338 A @ 10/1000 μs - quantifies maximum single-event current-handling capacity |
| Standby Leakage Current | 10 μA @ 33 V - ensures minimal power loss in always-on vehicle ECU or avionics modules |
| Moisture Sensitivity Level | Level 1 per J-STD-020B - allows standard SMT assembly without dry-pack or baking |
Pinout & Package
MAPLAD18KP33AE3 uses a surface-mount PLAD package with two terminals: anode and cathode. The cathode is the metal base (bottom side) of the device, requiring thermal pad connection to PCB ground plane or heatsink for optimal thermal performance. Package dimensions: 12.32 × 10.54 × 5.08 mm (L × W × H), with recommended FR4 pad layout per Microsemi RF01215 Rev B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line-side terminal | Connected to protected power rail or signal line; carries surge current into device |
| Cathode | Ground-reference terminal | Metal baseplate - must be soldered to large copper area or heatsink for thermal conduction and low-inductance return path |
Key Features
| Feature | Design Value |
|---|---|
| DO-160F Waveform 4 Level 4 compliance | Withstands 6.4/69 μs pin-injection transients up to 18 kV at 25°C - validated for aircraft flight control interfaces |
| IEC 61000-4-5 Class 5 support (42 Ω) | Meets highest secondary lightning immunity level for avionics power inputs without external series impedance |
| RoHS-compliant e3 matte-tin plating | Enables Pb-free reflow soldering at 260°C for 10 s without degradation - compatible with IPC-A-610 Class 3 assembly |
| AEC-Q101 qualification | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| Low-profile thermally optimized body | UL94V-0 void-free epoxy case with 0.7 °C/W RθJC - reduces thermal derating vs. legacy SMB/SMA packages by >40% |
Applications
| Avionics Power Input Protection | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protecting 28 V DC power input of flight management computers against DO-160 Section 22 lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected clamping TVS that activates within <100 ps to limit transient overvoltage to safe levels. Use Value: Enables compliance with RTCA DO-160F Waveform 4 Level 4 and IEC 61000-4-5 Class 5 without external filtering or series impedance. | Use Scenario: Safeguarding 12 V battery-fed engine control modules from ISO 7637-2 load dump events up to 120 V. IC Role / Device Role / Timing Role: Primary surge suppression element placed directly at connector entry point on PCB. Use Value: Absorbs 18 kW pulses while maintaining clamping below 53.3 V - prevents microcontroller reset or gate driver latch-up. |
| Railway Signaling Interface | Industrial Motor Drive DC Bus |
Use Scenario: Shielding 36 V signaling lines in train communication networks from induced surges during switching operations. IC Role / Device Role / Timing Role: Unidirectional TVS placed across isolated CAN or RS-485 bus lines referenced to local ground. Use Value: Provides 338 A IPP handling with <5 ns response - preserves signal integrity during 10/1000 μs transients per EN 50121-4. | Use Scenario: Protecting IGBT gate drivers and current sensors on 400 V DC bus of variable-frequency drives exposed to regenerative braking spikes. IC Role / Device Role / Timing Role: High-power clamping device mounted directly on bus capacitor ground plane. Use Value: Dissipates 18 kW surges with 0.7 °C/W thermal resistance - avoids thermal runaway during repeated motor start-stop 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 |
|---|---|---|---|
| SMBJ33A | Lower PPP (600 W), smaller SMB package, higher RθJA (50 °C/W), no DO-160F validation | Suitable only for consumer-grade 12 V systems; not rated for multi-stroke lightning or automotive load dump | Select MAPLAD18KP33AE3 when system-level standards (DO-160, ISO 7637-2, IEC 61000-4-5) mandate 18 kW surge handling and thermal robustness. |
| SMCJ33A | PPP = 1500 W, SMC package, RθJC ≈ 2.5 °C/W, AEC-Q101 qualified but not DO-160F tested | Acceptable for industrial PLC I/O protection where surge repetition rate is low and heatsinking is limited | Choose MAPLAD18KP33AE3 for aerospace or high-reliability automotive use where cumulative heating and multi-stroke endurance are critical design requirements. |
Compared with SMBJ33A and SMCJ33A, MAPLAD18KP33AE3 delivers 30× higher peak pulse power, 3.6× lower junction-to-case thermal resistance, and certified compliance with RTCA DO-160F Waveform 4 Level 4 - making it the only option for mission-critical avionics and heavy-duty automotive power protection where thermal margin and regulatory validation are non-negotiable.
Availability
MAPLAD18KP33AE3 is available at Aetrix Electronics and suitable for avionics power input protection, automotive engine control unit (ECU) surge hardening, and industrial motor drive DC bus safeguarding requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD18KP33AE3 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 semiconductor solutions for aerospace, defense, and industrial markets, with emphasis on radiation-hardened ICs, timing devices, and power protection components.
The MAPLAD family was developed specifically for high-energy transient suppression in safety-critical platforms where DO-160, ISO 7637-2, and IEC 61000-4-5 compliance must be achieved without compromising thermal performance or long-term reliability.
FAQ
What is the clamping voltage of MAPLAD18KP33AE3 at its rated peak pulse current?
The clamping voltage (VC) of MAPLAD18KP33AE3 is 53.3 V at 338 A peak impulse current (IPP) under 10/1000 μs waveform conditions. This value represents the maximum voltage seen across the device during worst-case surge events and is critical for ensuring downstream components remain within their absolute maximum voltage ratings. MAPLAD18KP33AE3 maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Does MAPLAD18KP33AE3 meet RTCA DO-160F lightning protection requirements?
Yes, MAPLAD18KP33AE3 is validated for RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 compliance at 25°C. It is explicitly listed in Microsemi's RF01215 Rev B documentation for these test levels. MAPLAD18KP33AE3 achieves this through low-inductance construction, metal-base thermal path, and precise breakdown uniformity - enabling direct integration into aircraft power distribution units without additional filtering.
What is the thermal resistance specification for MAPLAD18KP33AE3, and why does it matter?
MAPLAD18KP33AE3 has a junction-to-case thermal resistance (RθJC) of 0.7 °C/W, measured with the cathode baseplate mounted to a heatsink. This ultra-low value enables efficient heat transfer during repetitive surge events - essential for meeting RTCA DO-160 multi-stroke requirements. Compared to standard SMC/SMB packages (RθJC > 2.5 °C/W), MAPLAD18KP33AE3 reduces thermal derating by over 70%, allowing full 18 kW rating to be sustained across multiple transients without thermal runaway.
Is MAPLAD18KP33AE3 RoHS compliant, and what does the 'E3' suffix indicate?
Yes, MAPLAD18KP33AE3 is RoHS compliant, as confirmed by the 'E3' suffix in its part number. Per Microsemi nomenclature, 'E3' denotes annealed matte-tin plating compliant with EU RoHS Directive 2011/65/EU and China RoHS. This finish supports lead-free reflow soldering at 260°C for 10 seconds and meets MIL-STD-750 Method 2026 solderability requirements - critical for high-reliability aerospace and automotive manufacturing.
How does MAPLAD18KP33AE3 differ from bidirectional variants like MAPLAD18KP33CAE3?
MAPLAD18KP33AE3 is unidirectional, with cathode on the metal baseplate and anode on the top-side terminal, optimized for DC power rail protection. MAPLAD18KP33CAE3 is bidirectional, offering symmetrical clamping for AC or differential signal lines. Both share identical 18 kW PPP, 338 A IPP, and thermal specs, but MAPLAD18KP33AE3 provides lower leakage (<10 μA) and tighter V(BR) tolerance (36.7–40.6 V) - making it preferred for precision DC systems where reverse leakage and clamping asymmetry must be minimized.
MAPLAD18KP33AE3 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 338A
- 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
MAPLAD18KP33AE3 FAQ
1.How can I place an order for MAPLAD18KP33AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP33AE3 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 MAPLAD18KP33AE3 reliable?
The price and inventory of MAPLAD18KP33AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP33AE3 is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP33AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP33AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP33AE3?
MAPLAD18KP33AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP33AE3 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 MAPLAD18KP33AE3?
For technical support, including MAPLAD18KP33AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP33AE3 requirements.
6.How does Aetrix verify that MAPLAD18KP33AE3 is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP33AE3 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 MAPLAD18KP33AE3 meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP33AE3?
All MAPLAD18KP33AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP33AE3, 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 MAPLAD18KP33AE3 part is unused and in its original packaging.
Return procedure for MAPLAD18KP33AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP33AE3 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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