Microchip Technology MXLDA3KP40AE3

Overview

MXLDA3KP40AE3 from Microsemi is a unidirectional 3000 W surface-mount transient voltage suppressor (TVS) array with 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (V(BR)), and 64.5 V clamping voltage (VC) at 46.4 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 DC power rails.

For engineers reviewing the MXLDA3KP40AE3 datasheet, MXLDA3KP40AE3 pinout, MXLDA3KP40AE3 application, or MXLDA3KP40AE3 equivalent, key selection criteria include its 40 V working voltage rating, 64.5 V clamping performance at 46.4 A, RoHS-compliant e3 marking, -55°C to +150°C operating junction temperature, and compatibility with high-reliability industrial and aerospace systems requiring MIL-PRF-19500 screening options.

Technical Context

The MXLDA3KP40AE3 operates as a unidirectional avalanche diode-based TVS array optimized for fast transient suppression in DC power lines. Its <100 ps response time enables effective ESD protection, while its 10/1000 µs waveform-rated 3000 W peak pulse power handles lightning-induced surges with 42 Ω source impedance up to Class 4 per IEC61000-4-5.

It features a thermoset epoxy package rated UL94V-0, tin-lead or matte-tin terminations compliant with MIL-STD-750 Method 2026, and polarity defined by odd-numbered pins as cathodes. Standby leakage is limited to 2 µA at 40 V, supporting low-power system monitoring without loading effects.

Key Specifications

Pinout & Package

MXLDA3KP40AE3 uses a 3-pin vertical surface-mount TO-277A package (case outline per RF01243 Rev B, Page 6). Pin 1 is marked by a dot on top; odd-numbered pins (1 and 3) are cathodes, Pin 2 is anode. The package weighs ~5 g and meets UL94V-0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ40A and SMCJ40A, MXLDA3KP40AE3 delivers identical 40 V standoff and 64.5 V clamping performance at 3000 W, but in a compact vertical TO-277A package enabling higher board density and improved thermal dissipation versus SMB, while offering smaller footprint than SMC.

Availability

MXLDA3KP40AE3 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, aerospace avionics power systems, and renewable energy inverters requiring stable component supply with long-term lifecycle assurance.

Supply support for MXLDA3KP40AE3 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 for aerospace, defense, and industrial markets.

The MDA3KP series was designed specifically for high-energy transient suppression in mission-critical DC power systems where failure tolerance, temperature resilience, and MIL-spec screening are mandatory.

FAQ

What is the clamping voltage of MXLDA3KP40AE3 at its rated peak pulse current?

The MXLDA3KP40AE3 has a maximum clamping voltage (VC) of 64.5 V at 46.4 A peak pulse current (IPP), measured under 10/1000 µs waveform conditions. This value defines the highest voltage imposed on the protected circuit during a full-rated surge event and is critical for ensuring downstream components remain within their absolute maximum voltage ratings. The MXLDA3KP40AE3 maintains this clamping performance across its specified operating temperature range.

Is MXLDA3KP40AE3 RoHS-compliant and what does the 'e3' suffix indicate?

Yes, MXLDA3KP40AE3 is RoHS-compliant, as confirmed by the 'e3' suffix in its part number per Microsemi's nomenclature guide. The 'e3' designation specifies matte-tin plating on terminations and full compliance with EU Directive 2011/65/EU. This ensures suitability for environmentally regulated designs without lead content, while maintaining solderability per MIL-STD-750 Method 2026. The MXLDA3KP40AE3 also meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.

Can MXLDA3KP40AE3 be used for bidirectional transient protection?

No, MXLDA3KP40AE3 is a unidirectional TVS device, as indicated by the absence of 'C' in its part number (e.g., MDA3KP40CA would be bidirectional). It conducts only during positive transients on the cathode relative to anode and blocks reverse voltage up to its 40 V standoff rating. For AC or bipolar signal line protection, a bidirectional variant such as MXLDA3KP40CE3 must be selected instead of MXLDA3KP40AE3.

What is the maximum operating temperature range for MXLDA3KP40AE3?

The MXLDA3KP40AE3 is rated for junction and storage temperatures from -55°C to +150°C, making it suitable for extreme-environment applications including aerospace avionics, downhole oilfield tools, and industrial motor controls. Its thermal performance is validated across this full range, with derating curves provided in Figure 3 of the RF01243 datasheet. At +150°C, the MXLDA3KP40AE3 retains ≥50% of its 25°C peak pulse power rating.

Does MXLDA3KP40AE3 meet IEC61000-4-5 Class 4 lightning surge immunity requirements?

Yes, MXLDA3KP40AE3 is certified for secondary lightning protection per IEC61000-4-5 with 42 Ω source impedance up to Class 4, as explicitly stated in the Applications/Benefits section of RF01243 Rev B. Its 3000 W peak pulse power rating and 64.5 V clamping voltage ensure compliance when properly implemented with low-inductance PCB layout and appropriate coordination with upstream filtering. The MXLDA3KP40AE3 also supports Class 1–3 testing with 12 Ω and 2 Ω source impedances.