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Microchip Technology MAPLAD36KP28A
- Part No.:
- MAPLAD36KP28A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MAPLAD36KP28A.pdf
- Description:
- TVS DIODE 28VWM 46.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:7,580
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Product details
Overview
MAPLAD36KP28A 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, features a 28 V reverse standoff voltage (VWM), clamps to ≤46.4 V at 776 A peak pulse current (IPP), and operates across –55°C to +150°C junction temperature. It is widely deployed in aircraft lightning protection per RTCA DO-160 Section 22.
For engineers reviewing the MAPLAD36KP28A datasheet, MAPLAD36KP28A pinout, MAPLAD36KP28A application, or MAPLAD36KP28A equivalent, key selection criteria include its 28 V VWM rating, 46.4 V max clamping voltage at 776 A, low 1.0 °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 MAPLAD36KP28A employs an avalanche diode structure optimized for multi-stroke lightning transients, with validated performance under RTCA DO-160 Waveform 4 (6.4/69 μs) Level 4 and Waveform 5A (40/120 μs) Level 4 up to 38 CA-rated variants. Its metal-base cathode construction enables direct thermal coupling to heatsinks, supporting sustained surge handling at ≤0.05% duty cycle.
It meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (lightning) with 42 Ω, 12 Ω, and 2 Ω source impedances - achieving Class 5 protection at 28 V with 42 Ω source and Class 4 at 2 Ω source. Standby leakage ID is ≤10 μA at 28 V, and breakdown occurs at 31.1–34.4 V @ 5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPP) | 36,000 W @ 10/1000 μs - sustains single-stroke lightning surges without failure |
| Reverse Standoff Voltage (VWM) | 28 V - maximum continuous operating voltage before conduction begins |
| Clamping Voltage (VC) | ≤46.4 V @ 776 A IPP - limits downstream voltage stress during surge events |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables efficient heat transfer to PCB copper or external heatsink |
| Breakdown Voltage (V(BR)) | 31.1–34.4 V @ 5 mA - defines precise avalanche initiation threshold |
| Standby Leakage Current (ID) | ≤10 μA @ 28 V - ensures negligible power loss in standby operation |
| Operating Temperature Range | –55°C to +150°C - supports deployment in engine bays, avionics bays, and industrial enclosures |
Pinout & Package
MAPLAD36KP28A uses the PLAD surface-mount package: void-free UL94V-0 epoxy body (12.32 × 10.54 × 5.08 mm), tin-lead or RoHS-compliant matte-tin plating, and cathode terminal on the metal base (bottom side). Polarity marking is present only on unidirectional versions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top surface pad) | Surge current entry point | Connected to protected line; conducts during positive transients in unidirectional mode |
| Cathode (metal base) | Surge current return path | Must be soldered to large copper pour or heatsink for thermal management and low-inductance grounding |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW surge rating | Validated per RTCA DO-160 Section 22 multi-stroke lightning test - enables primary-level secondary protection in aircraft systems |
| Low RθJC = 1.0 °C/W | Enables >2× higher thermal margin vs. standard SMD TVS devices - reduces risk of thermal runaway under repeated surges |
| AEC-Q101 qualified | Guarantees reliability for automotive load-dump and battery-transient environments without additional qualification effort |
| MIL-PRF-19500 upscreening options | Supports M, MA, MX, MXL reliability levels - required for defense and space-grade programs with traceability mandates |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to reflow - reduces manufacturing cost and process complexity |
Applications
| Aerospace Lightning Protection | Automotive Load Dump Suppression |
|---|---|
Use Scenario: Protecting avionics power inputs against induced lightning currents per RTCA DO-160 Section 22 Waveform 4 and 5A. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed at board-level power entry to shunt surge energy to chassis ground. Use Value: Achieves Level 4 pin-injection protection up to 28 V VWM while maintaining <100 ps response time - preserves signal integrity in flight-critical systems. |
Use Scenario: Safeguarding 12 V/24 V vehicle ECUs during alternator load dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, positioned upstream of DC/DC converters and microcontrollers. Use Value: Clamps to 46.4 V within nanoseconds at 776 A - prevents damage to 36 V-rated downstream components without derating headroom. |
| Industrial Power Supply Input Protection | Railway Signaling Interface Protection |
Use Scenario: Securing AC/DC and DC/DC converter inputs against grid-switching transients and EFT bursts in factory automation systems. IC Role / Device Role / Timing Role: High-power TVS mounted directly at connector entry point with thermal pad tied to internal ground plane. Use Value: Withstands 36 kW surges at 0.05% duty cycle - eliminates need for series impedance or staged protection in compact 24 V/48 V supplies. |
Use Scenario: Hardening signaling lines (e.g., RS-485, CAN) in train control subsystems exposed to traction-induced surges per EN 50121-3-2. IC Role / Device Role / Timing Role: Bidirectional-capable variant (MAPLAD36KP28CA) used for differential line protection with common-mode suppression. Use Value: Meets IEC 61000-4-5 Class 4 with 2 Ω source impedance - protects against 1 kV/0.5 Ω fast-rising transients on trackside communication links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Lower PPP (600 W), smaller SMB package, RθJA ≈ 40 °C/W, no MIL-PRF-19500 screening | Suitable for consumer/industrial single-event surges; insufficient for DO-160 multi-stroke or AEC-Q101 automotive validation | Select SMBJ28A only for cost-sensitive, non-automotive/non-aerospace designs with <1 kA surge exposure. |
| SMCJ28A | Higher PPP (1500 W), larger SMC package, RθJA ≈ 25 °C/W, AEC-Q101 qualified but not DO-160 tested | Valid for ISO 7637-2 load dump; lacks RTCA DO-160 waveform validation and 36 kW capability | Choose SMCJ28A when DO-160 compliance is unnecessary and PCB space allows SMC footprint. |
Compared with SMBJ28A and SMCJ28A, MAPLAD36KP28A provides 24× and 24× higher peak pulse power respectively, certified multi-stroke lightning performance, and military-grade screening options - making it the only viable choice for aerospace DO-160 Level 4 and high-reliability automotive applications demanding >776 A surge handling.
Availability
MAPLAD36KP28A is available at Aetrix Electronics and suitable for aerospace lightning protection, automotive load dump suppression, and industrial power supply input protection requiring stable component supply across extended product lifecycles.
Supply support for MAPLAD36KP28A 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The MAPLAD36KP28A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for multi-stroke lightning and load-dump protection where thermal robustness, AEC-Q101 compliance, and DO-160 certification are mandatory.
FAQ
What is the clamping voltage of MAPLAD36KP28A at its rated peak pulse current?
The MAPLAD36KP28A has a maximum clamping voltage (VC) of 46.4 V at its rated peak pulse current (IPP) of 776 A under 10/1000 μs waveform conditions. This value is measured per Figure 3 in the RF01216 datasheet and ensures downstream circuitry remains below safe voltage thresholds during surge events. The MAPLAD36KP28A maintains this clamping performance across its full operating temperature range.
Is MAPLAD36KP28A qualified for automotive applications?
Yes, MAPLAD36KP28A is qualified to AEC-Q101 for use in automotive environments. It is specifically rated for load dump protection per ISO 7637-2 Pulse 5a and has been surge-tested to 1000 A due to equipment limitations - exceeding typical automotive requirements. Its –55°C to +150°C operating range and 1.0 °C/W thermal resistance make MAPLAD36KP28A suitable for under-hood and powertrain applications.
Does MAPLAD36KP28A meet RTCA DO-160 lightning protection standards?
Yes, MAPLAD36KP28A is validated for RTCA DO-160 Section 22 lightning-induced transient testing. It achieves Level 4 pin injection protection for Waveform 4 (6.4/69 μs) and Level 4 for Waveform 5A (40/120 μs) at 28 V VWM. These certifications are documented in Microsemi's RF01216 datasheet and supported by test reports referenced in MicroNote 132.
What is the thermal resistance and recommended mounting for MAPLAD36KP28A?
MAPLAD36KP28A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W. To realize this spec, the metal cathode base must be soldered to a minimum 1.0 in² (6.45 cm²) copper pad on FR4 PCB, per the pad layout in RF01216. Use of thermal vias and optional external heatsinking further improves sustained surge capability - critical for multi-stroke applications where duty factor exceeds 0.05%.
How does MAPLAD36KP28A differ from bidirectional variants like MAPLAD36KP28CA?
MAPLAD36KP28A is unidirectional with cathode on the metal base, intended for DC line protection where polarity is fixed. MAPLAD36KP28CA adds a "CA" suffix indicating bidirectional construction - enabling AC line or differential signal protection (e.g., RS-485, CAN). Both share identical PPP (36 kW), VWM (28 V), and thermal specs, but MAPLAD36KP28CA exhibits symmetrical clamping in both directions and lacks polarity marking.
MAPLAD36KP28A 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 46.4V
- Current - Peak Pulse (10/1000µs):
- 776A
- 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
MAPLAD36KP28A FAQ
1.How can I place an order for MAPLAD36KP28A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAPLAD36KP28A 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 MAPLAD36KP28A reliable?
The price and inventory of MAPLAD36KP28A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAPLAD36KP28A is usually 5 days.
3.What payment methods are accepted for MAPLAD36KP28A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAPLAD36KP28A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAPLAD36KP28A?
MAPLAD36KP28A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAPLAD36KP28A 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 MAPLAD36KP28A?
For technical support, including MAPLAD36KP28A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAPLAD36KP28A requirements.
6.How does Aetrix verify that MAPLAD36KP28A is sourced from the original manufacturer or authorized distributors?
All MAPLAD36KP28A 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 MAPLAD36KP28A meets industry standards.
7.What is the process for return or replacement of MAPLAD36KP28A?
All MAPLAD36KP28A units undergo pre-shipment inspection (PSI). If there is an issue with MAPLAD36KP28A, 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 MAPLAD36KP28A part is unused and in its original packaging.
Return procedure for MAPLAD36KP28A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAPLAD36KP28A Tags
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