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Microchip Technology MPLAD36KP48A
- Part No.:
- MPLAD36KP48A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD36KP48A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:5,871
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Product details
Overview
MPLAD36KP48A 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 transients to ≤77.4 V at 466 A, and features a 48 V reverse standoff voltage (VWM) with 53.3–58.9 V breakdown range. It meets RTCA DO-160 Section 22 multi-stroke lightning requirements and IEC 61000-4-5 Class 4 secondary lightning protection (42 Ω source).
For engineers reviewing the MPLAD36KP48A datasheet, MPLAD36KP48A pinout, MPLAD36KP48A application, or MPLAD36KP48A equivalent, this device is selected for high-reliability DC bus protection where fast response (<100 ps), low thermal resistance (RθJC = 1.0 °C/W), and AEC-Q101 qualification are critical - especially in avionics power distribution units, 24–48 V vehicle ECUs, and industrial PLC I/O modules.
Technical Context
The MPLAD36KP48A operates as a silicon avalanche diode configured in unidirectional polarity, with cathode on the metal base (package bottom). Its junction-to-case thermal resistance of 1.0 °C/W enables efficient heat transfer to PCB copper or external heatsinks under repetitive surge conditions up to 0.05% duty factor.
It complies with AEC-Q101 stress testing and supports secondary lightning protection per IEC 61000-4-5 at 42 Ω, 12 Ω, and 2 Ω source impedances - with validated performance up to Class 4 at 42 Ω and Class 3 at 2 Ω. Clamping occurs at 77.4 V maximum when subjected to 466 A peak impulse current (10/1000 μs waveform).
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 in aircraft power buses. |
| Reverse Standoff Voltage (VWM) | 48 V - sets maximum continuous operating voltage before clamping initiates; matches 48 V nominal DC systems. |
| Breakdown Voltage (VBR) | 53.3–58.9 V @ 5 mA - defines precise avalanche onset threshold for predictable turn-on behavior. |
| Max Clamping Voltage (VC) | 77.4 V @ 466 A - limits downstream IC voltage stress during worst-case surge events. |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables direct thermal coupling to heatsinked PCB pads for sustained multi-pulse operation. |
| Standby Current (ID) | 10 μA @ 48 V - ensures negligible leakage in always-on 48 V monitoring circuits. |
| Temperature Coefficient (αVBR) | 54 mV/°C - quantifies VBR drift over temperature; critical for design margining across –55°C to +150°C. |
Pinout & Package
Package: PLAD (Plastic Low-profile Anode-down) - void-free UL94V-0 epoxy body with tin-lead or RoHS-compliant matte-tin plating; cathode terminal is the entire metal base (bottom side); weight ≈ 1.7–2.0 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Top Surface Pad) | Current entry point during forward conduction | Connected to protected line (e.g., 48 V rail); requires minimum 0.230″ × 0.470″ copper pad per datasheet layout. |
| Cathode (Metal Base) | Current return path / heat sink interface | Electrically and thermally connected to system ground plane; primary thermal path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 36 kW Surge Rating | Validated at 10/1000 μs waveform - exceeds DO-160 Section 22 Level 4 multi-stroke lightning requirements. |
| AEC-Q101 Qualified | Passed stress tests including HTGB, HTRB, and temperature cycling - suitable for automotive ECU front-end protection. |
| Low RθJC = 1.0 °C/W | Enables >100 pulses at 0.05% duty cycle without thermal runaway when mounted per recommended pad layout. |
| RoHS Compliant (e3) | Tin-plated terminals meet J-STD-020B Level 1 moisture sensitivity - no dry pack required prior to reflow. |
| IEC 61000-4-2/4-4/4-5 Certified | Provides ESD (±15 kV air), EFT (40 A), and lightning surge (Class 4, 42 Ω) immunity in single-device solution. |
Applications
| Aerospace Power Distribution | Automotive 48 V ECUs |
|---|---|
Use Scenario: Protection of 28/270 V DC distribution panels and avionics bus interfaces against induced lightning transients per RTCA DO-160F Waveform 4 and 5A. IC Role / Device Role / Timing Role: Primary surge clamp on main power feeders; responds within <100 ps to limit voltage overshoot during multi-stroke events. Use Value: Enables compliance with DO-160 Section 22 Level 4 (Waveform 4) and Level 5 (Waveform 5A, short distance) without external snubbers or cascaded stages. |
Use Scenario: Front-end protection of 48 V mild-hybrid vehicle control units exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 120 V/200 ms load dump spikes to ≤77.4 V, preventing damage to downstream SiC MOSFET gate drivers and MCU power rails. |
| Industrial PLC I/O Modules | Railway Signaling Power Supplies |
Use Scenario: Input surge protection for 48 V DC-powered programmable logic controller analog/digital I/O cards in factory automation environments. IC Role / Device Role / Timing Role: First-line defense against EFT bursts (IEC 61000-4-4) and coupled lightning surges (IEC 61000-4-5). Use Value: Withstands 40 A EFT bursts and 4 kV/2 Ω lightning surges while maintaining <10 μA leakage at 48 V - preserving signal integrity in precision measurement circuits. |
Use Scenario: Secondary surge protection in EN 50121-3-2 compliant 48 V railway signaling power supplies subject to traction-induced transients. IC Role / Device Role / Timing Role: Parallel-mounted TVS on DC output stage of isolated 48 V converters feeding trackside electronics. Use Value: Delivers Class 4 immunity per IEC 61000-4-5 (42 Ω source) and supports long-distance deployment per EN 50121-3-2 Annex B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48A | Lower PPP rating (400 W vs. 36,000 W); same VWM and unidirectional polarity. | Suitable only for low-energy ESD/EFT; cannot replace MPLAD36KP48A in lightning or load dump scenarios. | Select only for cost-sensitive consumer-grade 48 V interfaces with sub-1 kA surge exposure. |
| Vishay V26MLA0603NH | MLV-based (not avalanche diode); 6 V nominal varistor voltage; 100 J energy rating; no specified clamping voltage. | Used in lower-voltage telecom ports; lacks DO-160 qualification and precise clamping control. | Consider only for non-safety-critical 48 V data lines where voltage tolerance > ±20% is acceptable. |
Compared with SMAJ48A and V26MLA0603NH, the MPLAD36KP48A provides three orders of magnitude higher surge power handling, certified aerospace qualification, and deterministic clamping behavior - making it irreplaceable in mission-critical 48 V power rail protection where failure is not an option.
Availability
MPLAD36KP48A is available at Aetrix Electronics and suitable for aerospace power distribution, automotive 48 V ECUs, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for MPLAD36KP48A 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 MPLAD36KP48A belongs to Microsemi's PLAD-series high-power TVS family, engineered specifically for DO-160-compliant lightning protection and AEC-Q101-qualified automotive surge suppression in harsh-environment power systems.
FAQ
What is the clamping voltage of the MPLAD36KP48A at its rated peak pulse current?
The MPLAD36KP48A has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current of 466 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 MPLAD36KP48A maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the MPLAD36KP48A qualified for automotive applications?
Yes, the MPLAD36KP48A is explicitly tested and qualified to AEC-Q101 standards, including high-temperature reverse bias, temperature cycling, and humidity testing. Its construction, wafer lot traceability, and surge validation make it suitable for front-end protection in 48 V automotive ECUs, particularly those exposed to load dump and ISO 7637-2 transients. The MPLAD36KP48A appears in Microsemi's AEC-Q101-compliant product portfolio documentation.
How does the MPLAD36KP48A differ from bidirectional variants like MPLAD36KP48CA?
The MPLAD36KP48A is unidirectional, with cathode on the metal base and anode on the top surface pad, intended for DC line protection where polarity is fixed. In contrast, MPLAD36KP48CA is bidirectional and symmetrical - capable of clamping both positive and negative transients - making it suitable for AC lines or differential signal pairs. The MPLAD36KP48A offers tighter VBR tolerance (53.3–58.9 V) versus the CA version (56.7–62.7 V), and its clamping curve is optimized for forward-biased conduction only.
What is the thermal resistance and recommended mounting for optimal performance of the MPLAD36KP48A?
The MPLAD36KP48A has a junction-to-case thermal resistance (RθJC) of 1.0 °C/W, and its metal base serves as the primary thermal path. For optimal performance, it must be mounted on a PCB with the recommended pad layout: 0.470″ × 0.230″ copper area (11.94 mm × 5.85 mm), connected to a solid ground plane. Thermal vias under the cathode pad are strongly advised to transfer heat to internal layers or heatsinks - essential for sustaining repetitive surges at 0.05% duty factor.
Does the MPLAD36KP48A meet DO-160 lightning protection requirements?
Yes, the MPLAD36KP48A is validated for RTCA DO-160F Section 22 multi-stroke lightning protection, specifically achieving Level 4 for Waveform 4 (6.4/69 μs) and Level 5 for Waveform 5A (40/120 μs) at short distances. It also supports secondary lightning protection per IEC 61000-4-5 up to Class 4 with 42 Ω source impedance. These qualifications are documented in Microsemi's RF01216 datasheet and referenced in MicroNote 132 for temperature derating guidance.
MPLAD36KP48A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 466A
- 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
MPLAD36KP48A FAQ
1.How can I place an order for MPLAD36KP48A through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD36KP48A 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 MPLAD36KP48A reliable?
The price and inventory of MPLAD36KP48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD36KP48A is usually 5 days.
3.What payment methods are accepted for MPLAD36KP48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD36KP48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD36KP48A?
MPLAD36KP48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD36KP48A 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 MPLAD36KP48A?
For technical support, including MPLAD36KP48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD36KP48A requirements.
6.How does Aetrix verify that MPLAD36KP48A is sourced from the original manufacturer or authorized distributors?
All MPLAD36KP48A 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 MPLAD36KP48A meets industry standards.
7.What is the process for return or replacement of MPLAD36KP48A?
All MPLAD36KP48A units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD36KP48A, 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 MPLAD36KP48A part is unused and in its original packaging.
Return procedure for MPLAD36KP48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD36KP48A Tags
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