Microchip Technology MDA3KP33AE3

Overview

MDA3KP33AE3 from Microsemi is a unidirectional 3000 W surface-mount transient voltage suppressor (TVS) array with 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (V(BR)), and 53.3 V clamping voltage (VC) at 56.2 A peak pulse current. It provides secondary lightning protection per IEC61000-4-5 (42 Ω, Class 1–4), ESD/EFT suppression per IEC61000-4-2/4-4, and inductive switching transient protection in industrial power interfaces.

For engineers reviewing the MDA3KP33AE3 datasheet, MDA3KP33AE3 pinout, MDA3KP33AE3 application, or MDA3KP33AE3 equivalent, key selection criteria include its 33 V working voltage, 53.3 V clamping performance at 56.2 A, RoHS-compliant e3 marking, -55°C to +150°C operating range, and unidirectional polarity for DC-biased rail protection.

Technical Context

The MDA3KP33AE3 operates as a silicon avalanche diode-based TVS, leveraging fast-clamping avalanche breakdown to divert surge energy away from sensitive downstream circuitry. Its <100 ps response time enables effective suppression of ESD events and sub-microsecond transients.

Designed for high-reliability vertical mounting, it delivers 3000 W peak pulse power at 10/1000 μs waveform with full surge testing per lot and 3σ screening on standby current (ID). Its UL94V-0 epoxy package supports reflow soldering up to 260°C and meets MIL-PRF-19500 optional upscreening requirements.

Key Specifications

Pinout & Package

MDA3KP33AE3 uses a 2-pin SMC (DO-214AB) surface-mount package with cathode-anode configuration. Pin 1 (cathode) is marked by a dot on the top surface; polarity follows standard unidirectional TVS convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with MDA3KP33AE3, SMBJ33A offers smaller footprint but only 20% of the surge power handling, while SMCJ33A matches the package and clamping voltage but delivers just half the peak current-making MDA3KP33AE3 the sole choice for full 3000 W, Class 4 lightning protection in mission-critical industrial and telecom systems.

Availability

MDA3KP33AE3 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and medical imaging power rails requiring stable component supply across extended product lifecycles.

Supply support for MDA3KP33AE3 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 and mixed-signal ICs, RF solutions, and discrete protection devices for aerospace, defense, and industrial markets.

The MDA3KP series was developed specifically for high-energy transient suppression in safety-critical infrastructure-emphasizing MIL-PRF-19500 upscreening readiness, full-lot surge validation, and guaranteed clamping performance across -55°C to +150°C.

FAQ

What is the clamping voltage of MDA3KP33AE3 at its rated peak pulse current?

The MDA3KP33AE3 has a maximum clamping voltage (VC) of 53.3 V at 56.2 A peak pulse current (IPP), measured under standardized 10/1000 μs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is validated per Figure 2 in the official RF01243 datasheet. Designers use this parameter to verify that downstream components remain within their absolute maximum voltage ratings when MDA3KP33AE3 is active.

Is MDA3KP33AE3 RoHS-compliant and what does the 'e3' suffix indicate?

Yes, MDA3KP33AE3 is RoHS-compliant, as confirmed by the 'e3' suffix in its part number. Per Microsemi's nomenclature guide (RF01243 Rev B, Page 2), 'e3' denotes matte-tin plating meeting JEDEC/IPC lead-free assembly standards. The device undergoes reflow up to 260°C for 10 seconds and complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. MDA3KP33AE3 is fully qualified for lead-free manufacturing without derating.

Can MDA3KP33AE3 be used for bidirectional transient protection?

No, MDA3KP33AE3 is unidirectional only. Its part number lacks the 'C' suffix (e.g., MDA3KP33CE3), which Microsemi reserves exclusively for bidirectional variants. The device conducts only during reverse-bias overvoltage events and must be oriented with cathode toward the protected line. For AC-coupled or bipolar rail protection, designers must select a 'C'-suffixed part or implement back-to-back unidirectional TVS configurations-not applicable to MDA3KP33AE3 alone.

What is the standoff voltage rating and how does it relate to system design?

The MDA3KP33AE3 has a rated reverse standoff voltage (VWM) of 33 V, meaning it remains non-conductive up to this DC or peak AC voltage across its terminals. System designers must ensure the nominal operating voltage of the protected rail does not exceed 33 V-e.g., it is appropriate for +24 V systems with ≤10% ripple but not for +48 V buses. Exceeding VWM risks premature conduction and increased standby current, degrading reliability. This specification is critical for correct placement in power rail protection schemes.

Does MDA3KP33AE3 meet IEC61000-4-5 Class 4 lightning surge immunity?

Yes, MDA3KP33AE3 is rated for IEC61000-4-5 Class 4 secondary lightning protection with 42 Ω source impedance, as explicitly stated in the Applications/Benefits section of RF01243 Rev B. Its 3000 W peak pulse power and 56.2 A IPP capability satisfy the 4 kV test level requirement. Performance is validated at 25°C; designers must apply thermal derating per Figure 3 above 80°C ambient to maintain Class 4 compliance throughout the full operating temperature range.