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Microchip Technology MDA3KP18A
- Part No.:
- MDA3KP18A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- 16-SMD, Gull Wing
- Datasheet:
-
MDA3KP18A.pdf
- Description:
- UNI-DIRECTIONAL TVS_16L DIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,084
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Product details
Overview
MDA3KP18A from Microsemi is a unidirectional 3000 W surface-mount transient voltage suppressor (TVS) diode with 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (V(BR)), and 29.2 V maximum clamping voltage (VC) at 102.8 A peak pulse current (IPP). It provides secondary lightning protection per IEC61000-4-5 (Class 4, 42 Ω source) and ESD/EFT suppression per IEC61000-4-2/4-4 in industrial power input and telecom interface circuits.
For engineers reviewing the MDA3KP18A datasheet, MDA3KP18A pinout, MDA3KP18A application, or MDA3KP18A equivalent, key selection criteria include its 18 V VWM rating, 29.2 V clamping performance at 102.8 A, unidirectional polarity, UL94V-0 molded package, and MIL-PRF-19500 upscreening capability for high-reliability deployments.
Technical Context
The MDA3KP18A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 20.0–22.1 V breakdown range. Its sub-100 ps response time enables effective suppression of ESD transients and fast-rising switching spikes.
Designed for 10/1000 µs surge waveforms, it delivers 3000 W peak pulse power with 29.2 V clamping at 102.8 A IPP while maintaining ≤2 µA standby current at 18 V VWM - ensuring minimal leakage in always-on protection paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 18 V - Maximum continuous DC or peak AC voltage the device blocks without conduction. |
| V(BR) Min–Max | 20.0–22.1 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on above operating rail. |
| VC @ IPP | 29.2 V @ 102.8 A - Clamping voltage during 10/1000 µs surge; defines protected circuit's maximum transient overvoltage. |
| PPP | 3000 W @ 10/1000 µs - Peak surge energy handling capacity under standardized lightning-surge waveform. |
| ID @ VWM | ≤2 µA - Ultra-low leakage current preserves signal integrity and minimizes power loss in standby. |
| TJ Range | −55 to +150 °C - Extended thermal operating envelope supports under-hood, industrial, and aerospace environments. |
Pinout & Package
MDA3KP18A uses a 2-pin surface-mount DO-214AB (SMC) package with void-free UL94V-0 epoxy body, tin-lead or matte-tin plating, and polarity marked by dot indicating Pin 1 (cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Connected to protected line (e.g., DC input); conducts during overvoltage to shunt current to ground. |
| Pin 2 | Anode | Connected to system ground; completes low-impedance path for transient current dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 3000 W peak pulse power | Enables robust secondary lightning protection per IEC61000-4-5 Class 4 (42 Ω source) without derating at 25 °C. |
| 29.2 V clamping at 102.8 A | Limits downstream IC stress to safe levels during 10/1000 µs surges in 24 V industrial power rails. |
| ≤2 µA standby current at 18 V | Minimizes quiescent power loss and avoids false triggering in low-power always-on monitoring circuits. |
| MIL-PRF-19500 upscreening option | Supports high-reliability qualification for defense, avionics, and space-grade applications with full lot traceability. |
Applications
| Industrial Power Input Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24 V DC power feed to PLC I/O modules exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges. Use Value: 29.2 V clamping ensures microcontroller and analog front-end ICs remain below absolute maximum ratings during 3000 W transients. | Use Scenario: Protection of RS-485 transceivers on outdoor base station backhaul links subject to induced lightning surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on differential bus lines to absorb common-mode surges before they reach transceiver inputs. Use Value: 102.8 A IPP rating handles IEC61000-4-5 42 Ω source impedance Class 4 surges without degradation. |
| Automotive Body Control Module | Medical Equipment AC/DC Front-End |
Use Scenario: 12 V supply rail protection in BCMs subjected to ISO 7637-2 pulse 1 and pulse 3a/b transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery-fed subsystems, coordinated with upstream fuses. Use Value: Sub-100 ps response time prevents latch-up in CAN controllers and sensor interfaces during fast-edge transients. | Use Scenario: Secondary-side transient suppression on isolated 24 V DC output of medical-grade AC/DC converters. IC Role / Device Role / Timing Role: Final-stage TVS safeguarding patient-connected monitoring circuits against internal switching noise and coupling events. Use Value: UL94V-0 package and ≤2 µA leakage meet IEC 60601-1 creepage/clearance and leakage current safety 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 |
|---|---|---|---|
| SMBJ18A | 600 W PPP rating; same 18 V VWM and DO-214AA package; lower clamping (29.2 V vs. 28.7 V) but reduced surge capacity. | Not rated for IEC61000-4-5 Class 4; suitable only for Class 1–2 or lower-energy ESD/EFT scenarios. | Select SMBJ18A only when system-level surge testing does not require 3000 W capability. |
| 1.5KE18A | 3000 W PPP in axial DO-201 package; higher clamping (29.2 V vs. 30.0 V); no SMT footprint or MIL-PRF-19500 screening option. | Requires through-hole PCB layout; unsuitable for automated assembly or high-vibration environments. | Choose 1.5KE18A only if board space allows axial leads and reliability screening is not required. |
Compared with SMBJ18A and 1.5KE18A, the MDA3KP18A uniquely combines 3000 W surge rating, SMT DO-214AB packaging, and optional MIL-PRF-19500 screening - making it the only choice for Class 4 lightning protection in high-reliability surface-mount systems.
Availability
MDA3KP18A is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface hardening, and automotive body control module designs requiring stable component supply across extended product lifecycles.
Supply support for MDA3KP18A 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 components.
The MDA3KP series was engineered specifically for mission-critical transient suppression in aerospace, defense, and industrial systems where failure is not an option.
FAQ
What is the clamping voltage of the MDA3KP18A at its rated peak pulse current?
The MDA3KP18A has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPP) of 102.8 A under 10/1000 µs waveform conditions. This value is guaranteed per the RF01243 Rev B datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The MDA3KP18A maintains this clamping performance across its full operating temperature range.
Is the MDA3KP18A unidirectional or bidirectional, and how is polarity identified?
The MDA3KP18A is a unidirectional TVS diode, indicated by the absence of "C" in its part number. Polarity is marked on the package with a dot denoting Pin 1 (cathode), and odd-numbered pins are cathodes per the datasheet. This configuration ensures conduction only during positive transients on the cathode side relative to anode (ground), making it ideal for DC rail protection. The MDA3KP18A must be oriented correctly to avoid forward-bias damage.
Does the MDA3KP18A meet IEC61000-4-5 Class 4 requirements?
Yes, the MDA3KP18A is explicitly rated for IEC61000-4-5 Class 4 secondary lightning protection with a 42 Ω source impedance, as confirmed in the Applications/Benefits section of RF01243 Rev B. Its 3000 W peak pulse power and 102.8 A IPP rating enable compliance without external derating. The MDA3KP18A achieves this while maintaining 29.2 V clamping - critical for protecting 24 V systems within safe voltage margins.
What is the maximum standoff voltage (VWM) and why is it important for MDA3KP18A selection?
The MDA3KP18A has a rated working standoff voltage (VWM) of 18 V, meaning it reliably blocks voltages up to this level during normal operation. Selecting a VWM ≥ the system's maximum continuous operating voltage prevents nuisance conduction while ensuring sufficient margin for ripple and tolerance. For a nominal 24 V rail, the MDA3KP18A is typically paired with upstream filtering; the MDA3KP18A's 18 V VWM balances leakage control and surge headroom.
Can the MDA3KP18A be used in high-reliability applications requiring military-grade screening?
Yes, optional MIL-PRF-19500 upscreening is available for the MDA3KP18A, including wafer fabrication and assembly lot traceability, 3σ lot norm screening on standby current (ID), and conformance inspections per Micronote 129. This makes the MDA3KP18A suitable for defense, avionics, and space applications where long-term reliability and process control are mandatory. The MDA3KP18A's base qualification already meets high-reliability standards even without upscreening.
MDA3KP18A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- 16-SMD, Gull Wing
- Series:
- MDA
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 8
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 102.8A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
MDA3KP18A FAQ
1.How can I place an order for MDA3KP18A through Aetrix?
Please submit a Request for Quotation (RFQ) for MDA3KP18A 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 MDA3KP18A reliable?
The price and inventory of MDA3KP18A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MDA3KP18A is usually 5 days.
3.What payment methods are accepted for MDA3KP18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MDA3KP18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MDA3KP18A?
MDA3KP18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MDA3KP18A 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 MDA3KP18A?
For technical support, including MDA3KP18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MDA3KP18A requirements.
6.How does Aetrix verify that MDA3KP18A is sourced from the original manufacturer or authorized distributors?
All MDA3KP18A 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 MDA3KP18A meets industry standards.
7.What is the process for return or replacement of MDA3KP18A?
All MDA3KP18A units undergo pre-shipment inspection (PSI). If there is an issue with MDA3KP18A, 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 MDA3KP18A part is unused and in its original packaging.
Return procedure for MDA3KP18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MDA3KP18A Tags
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