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Microchip Technology MAPLAD36KP24A
- Part No.:
- MAPLAD36KP24A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP24A.pdf
- Description:
- TVS DIODE 24VWM 39.8VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:2,963
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Product details
Overview
MAPLAD36KP24A from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace and automotive systems. It delivers 36,000 W peak pulse power at 10/1000 μs, clamps at ≤39.8 V under 905 A peak impulse current, and features a 24 V reverse standoff voltage (VWM) with 26.7–29.5 V breakdown range. It is qualified to AEC-Q101 and meets RTCA DO-160 Section 22 multi-stroke lightning requirements.
For engineers reviewing the MAPLAD36KP24A datasheet, MAPLAD36KP24A pinout, MAPLAD36KP24A application, or MAPLAD36KP24A equivalent, key selection criteria include its 24 V VWM rating, 39.8 V max clamping voltage at 905 A, low thermal resistance (RθJC = 1.0 °C/W), RoHS-compliant e3 plating, and suitability for secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance (Class 1–5).
Technical Context
The MAPLAD36KP24A is a silicon avalanche diode TVS optimized for high-reliability transient suppression in harsh environments. Its unidirectional polarity and metal-base cathode configuration enable efficient heat dissipation through the PCB pad layout. It operates across –55 °C to +150 °C junction temperature and maintains stable clamping performance under repetitive surges at ≤0.05% duty factor.
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) standards, and supports pin injection protection per RTCA/DO-160F Waveform 4 (Level 4 up to 400 V) and Waveform 5A (Level 4 up to 78 V). Derating applies above 25 °C ambient per Figure 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous operating voltage before conduction begins; sets system voltage margin for 24 V nominal rails. |
| V(BR) min/max | 26.7–29.5 V - Breakdown occurs within this range at 5 mA; ensures predictable turn-on threshold across temperature and lot variation. |
| VC @ IPP | ≤39.8 V @ 905 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to safe levels for 24 V electronics. |
| PPP | 36,000 W - Peak pulse power handling capability; enables robust protection against lightning-induced transients per DO-160. |
| RθJC | 1.0 °C/W - Junction-to-case thermal resistance; allows direct thermal coupling to heatsink or copper pour for sustained surge duty. |
| ID @ VWM | ≤10 μA - Standby leakage current at 24 V; minimizes quiescent power loss in always-on systems. |
| αV(BR) | +22 mV/°C - Positive temperature coefficient of breakdown voltage; improves parallel operation stability and thermal runaway immunity. |
Pinout & Package
MAPLAD36KP24A uses a surface-mount PLAD package with a metal base cathode terminal and top-side anode pad. The package measures 12.32 × 10.54 × 3.68 mm (L × W × H) and features void-free UL94V-0 epoxy molding and annealed matte-tin (e3) plating for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side pad) | Positive surge current entry point | Connected to protected line; conducts transient energy toward cathode during overvoltage events. |
| Cathode (metal base) | Surge return path and thermal interface | Mounted directly to PCB copper pour or heatsink; serves dual role as electrical return and primary heat extraction surface. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and HAST testing - suitable for under-hood and safety-critical ECUs. |
| RTCA DO-160 Section 22 compliant | Passes multi-stroke lightning test (Waveform 3, 4, 5A) - certified for avionics power and signal line protection. |
| Low RθJC = 1.0 °C/W | Enables >90% of surge energy to be conducted into PCB copper, reducing junction temperature rise by ~900 °C/W vs. standard SMD TVS. |
| RoHS-compliant e3 plating | Tin-lead-free matte-tin finish meeting J-STD-020B Level 1 moisture sensitivity - eliminates dry-pack requirement and supports lead-free reflow. |
| Traceable wafer & assembly lots | Full lot traceability per MIL-PRF-19500 - required for aerospace prime contractors and defense programs. |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC power bus in commercial aircraft avionics cabinets subjected to lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Unidirectional TVS placed at bus input to clamp transients before they reach upstream converters and downstream LRUs. Use Value: Limits clamped voltage to ≤39.8 V, protecting 36 V-rated DC-DC modules and ensuring compliance with DO-160 Level 4/5 waveform requirements. | Use Scenario: 24 V battery-fed engine control unit exposed to ISO 7637-2 Load Dump pulses (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Primary clamping device on main power rail, absorbing >30 kJ energy without degradation over 1000+ cycles. Use Value: Withstands 905 A peak current at 10/1000 μs and maintains <10 μA leakage at 24 V - prevents false resets and preserves low-power sleep modes. |
| Industrial Motor Drive DC Bus | Railway Signaling Interface |
Use Scenario: 24 V auxiliary supply in variable-frequency drives subject to switching transients and induced RFI from IGBT commutation. IC Role / Device Role / Timing Role: Fast-response TVS across DC link capacitor terminals to suppress dV/dt spikes and prevent gate driver latch-up. Use Value: Sub-100 ps response time and 39.8 V clamping ensure MOSFET gate oxide remains below 20 V stress during 100 ns edge transients. | Use Scenario: 24 V signaling lines in European railway interlocking systems requiring EN 50121-4 immunity to 42 Ω IEC 61000-4-5 surges (Class 3/4). IC Role / Device Role / Timing Role: Secondary protection device installed after gas discharge tube (GDT) front-end, providing low-clamp refinement. Use Value: Enables Class 4 compliance at 24 V level with 39.8 V clamping - keeps interface ICs (e.g., RS-485 transceivers) within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | 600 W PPP rating, 38.9 V VC @ 15.3 A, DO-214AA package, RθJC ≈ 40 °C/W | Lower energy handling; suited for board-level ESD/EFT only, not lightning or load dump | Select SMBJ24A only for cost-sensitive consumer applications with sub-1 kA surge exposure. |
| SMCJ24A | 1500 W PPP rating, 38.9 V VC @ 38.3 A, DO-214AB package, RθJC ≈ 15 °C/W | Limited to single-stroke surges; fails under repeated 10/1000 μs events per DO-160 | Choose SMCJ24A for industrial controls with infrequent transients but no aerospace/automotive qualification needs. |
Compared with SMBJ24A and SMCJ24A, the MAPLAD36KP24A delivers 24× and 24× higher peak pulse power respectively, achieves 1.0 °C/W thermal resistance via metal-base mounting, and is qualified to AEC-Q101 and DO-160 - making it the sole option for certified multi-stroke lightning protection in 24 V aerospace and automotive systems.
Availability
MAPLAD36KP24A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial motor drive DC bus applications requiring stable component supply across extended production lifecycles.
Supply support for MAPLAD36KP24A 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) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP24A belongs to Microsemi's high-power PLAD TVS family, engineered specifically for multi-stroke lightning and load dump protection in mission-critical 24 V systems where thermal management and qualification compliance are non-negotiable.
FAQ
What is the clamping voltage of MAPLAD36KP24A at its rated peak pulse current?
The MAPLAD36KP24A has a maximum clamping voltage (VC) of 39.8 V at its rated peak pulse current (IPP) of 905 A under 10/1000 μs waveform conditions. This value is guaranteed across temperature and lot variation per the datasheet's electrical characteristics table and is critical for ensuring downstream 24 V components remain within safe operating voltage limits during surge events.
Is MAPLAD36KP24A suitable for bidirectional signal line protection?
No, MAPLAD36KP24A is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. Its polarity is fixed: cathode on the metal base, anode on the top-side pad. For bidirectional protection at 24 V, the correct variant is MAPLAD36KP24CA, which features symmetrical clamping in both directions and is explicitly designated with the "CA" suffix in the part number.
Does MAPLAD36KP24A require a heatsink for standard operation?
MAPLAD36KP24A does not require an external heatsink for single-event surge suppression, but its metal base must be soldered to a minimum 1.0 in² (645 mm²) copper pour on the PCB to achieve the specified RθJC of 1.0 °C/W. Without adequate copper area, thermal resistance rises sharply, risking junction overheating during repetitive surges - especially above 0.05% duty cycle.
What qualification standards does MAPLAD36KP24A meet?
MAPLAD36KP24A is qualified to AEC-Q101 for automotive use and meets RTCA DO-160 Section 22 for multi-stroke lightning, IEC 61000-4-2 (±8 kV contact ESD), IEC 61000-4-4 (4 kV EFT), and IEC 61000-4-5 (42 Ω source, Class 1–5). It also conforms to IPC/JEDEC J-STD-020B Level 1 moisture sensitivity and RoHS Directive 2011/65/EU (e3 plating).
Can MAPLAD36KP24A be used in parallel for higher current handling?
Parallel use of MAPLAD36KP24A devices is not recommended due to mismatch in breakdown voltage (26.7–29.5 V range) and positive temperature coefficient (+22 mV/°C), which can cause current imbalance and premature failure of one unit. For higher current needs, select a higher-voltage variant (e.g., MAPLAD36KP30A) or consult Microsemi's application note AN-134 for derated multi-device configurations with forced current sharing.
MAPLAD36KP24A 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 39.8V
- Current - Peak Pulse (10/1000µs):
- 905A
- 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
MAPLAD36KP24A FAQ
1.How can I place an order for MAPLAD36KP24A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP24A 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 MAPLAD36KP24A reliable?
The price and inventory of MAPLAD36KP24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP24A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP24A?
MAPLAD36KP24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP24A 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 MAPLAD36KP24A?
For technical support, including MAPLAD36KP24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP24A requirements.
6.How does Aetrix verify that MAPLAD36KP24A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP24A 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 MAPLAD36KP24A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP24A?
All MAPLAD36KP24A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP24A, 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 MAPLAD36KP24A part is unused and in its original packaging.
Return procedure for MAPLAD36KP24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP24A Tags
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