My Inquiry
My Account
Microchip Technology MAPLAD18KP33A
- Part No.:
- MAPLAD18KP33A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD18KP33A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:4,514
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPLAD18KP33A 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 18,000 W peak pulse power at 10/1000 μs, clamps at ≤53.3 V under 338 A peak impulse current, and features a 33 V reverse standoff voltage (VWM) with 36.7–40.6 V breakdown range. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22 and secondary IEC 61000-4-5 surge suppression.
For engineers reviewing the MPLAD18KP33A datasheet, MPLAD18KP33A pinout, MPLAD18KP33A application, or MPLAD18KP33A equivalent, key selection criteria include its 33 V VWM rating, 53.3 V max clamping voltage at 338 A, 0.7 °C/W junction-to-case thermal resistance, RoHS-compliant e3 plating, and qualification to AEC-Q101 and MIL-PRF-19500 screening levels.
Technical Context
The MPLAD18KP33A employs an avalanche diode structure optimized for low clamping ratio and minimal thermal resistance. Its metal-base package enables direct heatsinking, supporting sustained multi-stroke surge events with <100 ps response time and 5 μA standby current at rated VWM.
It meets RTCA DO-160F Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 requirements when mounted per recommended pad layout on FR4. Derating applies above 100°C case temperature, with steady-state dissipation limited to 71 W at TC = 100°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous operating voltage before conduction begins |
| V(BR) min/max | 36.7–40.6 V - Breakdown occurs within this range at 1 mA, ensuring predictable turn-on margin |
| VC @ IPP | 53.3 V - Clamping voltage at 338 A peak pulse, limiting downstream voltage stress |
| PPP | 18,000 W - Peak pulse power handling at 10/1000 μs waveform, enabling lightning-level transients |
| RθJC | 0.7 °C/W - Enables efficient heat transfer to heatsink, critical for repetitive surge duty |
| ID @ VWM | 10 μA - Ultra-low leakage ensures minimal standby power loss in high-impedance circuits |
| Package | PLAD - Surface-mount, metal-base thermally enhanced package with UL94V-0 epoxy body |
Pinout & Package
The MPLAD18KP33A uses the PLAD surface-mount package: void-free UL94V-0 epoxy body with tin-lead or RoHS-compliant matte-tin plating; cathode is the metal base (bottom side); weight ≈1 g; standard EIA-481-B tape-and-reel available with "TR" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface) | Transient current entry point (unidirectional) | Connected to protected line; conducts surge current toward cathode during overvoltage |
| Cathode (metal base) | Transient current return path & thermal interface | Must be soldered to copper pour or heatsink for effective thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW peak pulse rating | Supports multi-stroke lightning events per RTCA DO-160 Section 22 without degradation |
| 0.7 °C/W RθJC | Enables >70 W steady-state dissipation at 100°C case temperature, reducing thermal derating |
| AEC-Q101 qualified | Validated for automotive load-dump and battery-transient environments per stress test conditions |
| IEC 61000-4-2/4-4/4-5 compliant | Provides system-level ESD, EFT, and surge immunity without external filtering components |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints, simplifying SMT assembly logistics |
Applications
| Aircraft Lightning Protection | Automotive Load-Dump Suppression |
|---|---|
Use Scenario: Protecting avionics power inputs against induced surges from lightning strikes per RTCA DO-160F Section 22. IC Role / Device Role / Timing Role: Primary transient clamp on 28 V DC distribution bus feeding flight control modules. Use Value: Withstands ≥1500 A single-stroke and multi-cycle waveforms while maintaining clamping below 55 V to preserve downstream 36 V-rated ICs. | Use Scenario: Safeguarding engine control units (ECUs) during alternator load dump events in 12 V/24 V vehicle architectures. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ECU input filter stage. Use Value: Limits transient voltage to ≤53.3 V at 338 A, preventing latch-up or damage to 33 V tolerant microcontrollers and CAN transceivers. |
| Industrial Power Supply Input Protection | Secondary Surge Protection for Telecom Interfaces |
Use Scenario: Front-end surge suppression for AC/DC and DC/DC converters in factory automation equipment exposed to grid switching transients. IC Role / Device Role / Timing Role: Standoff-clamp device across bulk input capacitor, upstream of active rectification stage. Use Value: Absorbs up to 18 kW pulses without failure, maintaining VWM = 33 V compatibility with 24 V nominal industrial rails and enabling compact PCB layout. | Use Scenario: Secondary-level protection on Ethernet or RS-485 data lines fed from externally powered ports subject to induced surges. IC Role / Device Role / Timing Role: Low-capacitance TVS array supplementing primary gas discharge tube (GDT) protection. Use Value: Provides fast-response clamping (≤100 ps) with 53.3 V VC to protect PHY ICs rated for 36 V abs max, meeting IEC 61000-4-5 Class 4 (42 Ω source). |
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 | 600 W PPP rating, 5.0 mm × 3.5 mm SMB package, RθJC ≈ 15 °C/W | Limited to single-event or low-duty-cycle surges; unsuitable for RTCA DO-160 multi-stroke testing | Select SMBJ33A only for cost-sensitive consumer-grade designs with <1 kA expected surge exposure. |
| SMCJ33A | 1500 W PPP rating, 7.1 mm × 6.2 mm SMC package, RθJC ≈ 3.5 °C/W | Meets IEC 61000-4-5 Class 3 but not Class 4/5; lacks AEC-Q101 or DO-160 qualification | Choose SMCJ33A for industrial controls requiring higher energy than SMBJ but without aerospace or automotive certification needs. |
Compared with SMBJ33A and SMCJ33A, the MPLAD18KP33A provides 30× and 12× higher peak pulse power respectively, validated thermal performance for repeated surges, and full compliance with RTCA DO-160F and AEC-Q101-making it the only option for certified aerospace and high-reliability automotive deployments.
Availability
MPLAD18KP33A is available at Aetrix Electronics and suitable for aircraft avionics, automotive ECUs, industrial power supplies, and telecom infrastructure requiring stable component supply across extended production lifecycles.
Supply support for MPLAD18KP33A 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MPLAD18KP33A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for certified lightning and load-dump protection where thermal robustness, multi-stroke endurance, and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of the MPLAD18KP33A under surge conditions?
The MPLAD18KP33A has a maximum clamping voltage (VC) of 53.3 V at 338 A peak pulse current (IPP) under 10/1000 μs waveform conditions. This value is guaranteed per datasheet Figure 3 and ensures protected circuitry remains below critical voltage thresholds during high-energy transients such as lightning-induced surges or automotive load dump events.
Is the MPLAD18KP33A qualified for automotive applications?
Yes, the MPLAD18KP33A is qualified to AEC-Q101 standards for discrete semiconductors, validating its reliability under automotive temperature cycling, humidity, and mechanical stress tests. It is explicitly rated for load-dump protection in 12 V/24 V vehicle systems and supports design compliance with ISO 7637-2 Pulse 5a/b requirements when implemented with proper PCB layout and thermal management.
Does the MPLAD18KP33A require special PCB layout considerations?
Yes-the MPLAD18KP33A requires adherence to the recommended pad layout in RF01215 Rev B, including minimum 12.32 mm × 10.54 mm copper area on the bottom-side cathode pad for thermal conduction. Short, wide traces to ground and minimized loop area are essential to preserve its <100 ps response time and avoid inductive voltage overshoot during fast transients.
Can the MPLAD18KP33A be used in bidirectional configurations?
No-the MPLAD18KP33A is unidirectional (denoted by "A" suffix). For bidirectional operation, the functionally matched part is MPLAD18KP33CA, which provides symmetrical clamping for AC-coupled or floating signal lines. Substituting MPLAD18KP33A in bidirectional roles risks reverse-bias breakdown and permanent failure.
What screening options are available for the MPLAD18KP33A in high-reliability programs?
The MPLAD18KP33A supports MIL-PRF-19500 upscreening with M, MA, MX, and MXL reliability levels, including lot traceability, 3σ standby current screening, and extended environmental testing. These options are documented in the Hirel Non-Hermetic Product Portfolio and require explicit ordering with appropriate screening suffixes-not available in standard commercial-grade shipments.
MAPLAD18KP33A 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
MAPLAD18KP33A FAQ
1.How can I place an order for MAPLAD18KP33A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD18KP33A 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 MAPLAD18KP33A reliable?
The price and inventory of MAPLAD18KP33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD18KP33A is usually 5 days.
3.What payment methods are accepted for MAPLAD18KP33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD18KP33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD18KP33A?
MAPLAD18KP33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD18KP33A 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 MAPLAD18KP33A?
For technical support, including MAPLAD18KP33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD18KP33A requirements.
6.How does Aetrix verify that MAPLAD18KP33A is sourced from the original manufacturer or authorized distributors?
All MAPLAD18KP33A 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 MAPLAD18KP33A meets industry standards.
7.What is the process for return or replacement of MAPLAD18KP33A?
All MAPLAD18KP33A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD18KP33A, 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 MAPLAD18KP33A part is unused and in its original packaging.
Return procedure for MAPLAD18KP33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD18KP33A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
