Vishay General Semiconductor - Diodes Division SMP24-M3/84A

Overview

SMP24-M3/84A from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) designed for clamping inductive switching surges and lightning-induced transients on power rails and signal lines. It features a 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), 400 W peak pulse power (10/1000 μs), 10.3 A peak pulse current (IPPM), and clamps to ≤38.9 V at rated surge. It is used in industrial sensor interfaces and DC power input protection.

For engineers reviewing the SMP24-M3/84A datasheet, SMP24-M3/84A pinout, SMP24-M3/84A application, or SMP24-M3/84A equivalent, key selection criteria include unidirectional polarity, DO-220AA (SMP) package compatibility with automated placement, 1.0 mm profile height, MSL Level 1 rating, and 150 °C maximum junction temperature.

Technical Context

The SMP24-M3/84A operates as a silicon avalanche diode optimized for fast transient suppression in low-inductance surface-mount configurations. Its clamping behavior is defined by a 26.7–29.5 V breakdown range at 1 mA test current and a maximum clamping voltage of 38.9 V at 10.3 A IPPM under 10/1000 μs waveform conditions.

It exhibits very low incremental surge resistance and sub-nanosecond response time, enabling effective protection of downstream MOSFETs and ICs against ESD and load-switching spikes. Thermal performance is characterized by 50 °C/W junction-to-lead and 250 °C/W junction-to-ambient thermal resistance, with derating applied above 25 °C ambient.

Key Specifications

Pinout & Package

Package: DO-220AA (SMP), ultra-low-profile surface-mount case with matte tin-plated leads, halogen-free, RoHS-compliant, MSL Level 1, 260 °C reflow compatible. Cathode denoted by color band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMP24A-M3/84A (identical function) and SMBJ24A (higher-power but taller SMB package), the SMP24-M3/84A delivers optimal balance of low-profile packaging, 400 W surge capability, and automated assembly readiness for space- and cost-sensitive industrial electronics.

Availability

SMP24-M3/84A is available at Aetrix Electronics and suitable for industrial sensor interfaces, 24 V DC power input protection, and telecom line card surge resilience requiring stable component supply across multi-year production cycles.

Supply support for SMP24-M3/84A 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and application-specific optimization.

The SMP series was developed to deliver high-surge-capability TVS protection in the industry's lowest-profile surface-mount package (DO-220AA), targeting space-constrained industrial, computing, and telecom systems requiring automated assembly and high thermal cycling endurance.

FAQ

What is the exact breakdown voltage range for SMP24-M3/84A?

The SMP24-M3/84A has a guaranteed breakdown voltage (VBR) range of 26.7 V to 29.5 V at 1 mA test current, as specified in the Vishay datasheet Document Number 88481, page 2. This range ensures consistent clamping behavior across production lots and supports reliable overvoltage protection in 24 V nominal systems where margin above VWM (24 V) is critical. The SMP24-M3/84A maintains this specification under standard test conditions (TA = 25 °C).

Is SMP24-M3/84A unidirectional or bidirectional?

The SMP24-M3/84A is a unidirectional transient voltage suppressor, confirmed by its polarity marking (cathode band), VWM/VBR specification structure, and inclusion in the "uni-directional" feature list on page 1 of the Vishay datasheet. It is intended for DC rail protection where reverse conduction must be blocked during normal operation. Bidirectional variants (e.g., SMBJ24CA) are separate part numbers and not interchangeable with SMP24-M3/84A.

What does the "-M3/84A" suffix indicate for SMP24-M3/84A?

The "-M3" suffix denotes halogen-free, RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability standards and JESD 201 Class 1A whisker resistance. The "/84A" indicates 7-inch plastic tape-and-reel packaging with 3000 units per reel, as shown in the Ordering Information table on page 2 of the Vishay datasheet. This packaging format ensures compatibility with standard SMT pick-and-place equipment.

Can SMP24-M3/84A replace SMAJ24A in an existing design?

No - SMP24-M3/84A uses the DO-220AA (SMP) package (1.0 mm height), while SMAJ24A uses DO-214AC (SMA) with 2.2 mm height and different pad layout. Although both have similar VWM (24 V) and VC (≤38.9 V vs. ≤38.9 V), the mechanical incompatibility means direct replacement would require PCB redesign. The SMP24-M3/84A is not a drop-in substitute for SMAJ24A; verify land pattern and thermal relief before integration.

What is the maximum clamping voltage of SMP24-M3/84A under surge conditions?

The SMP24-M3/84A has a maximum clamping voltage (VC) of 38.9 V at its rated peak pulse current (IPPM) of 10.3 A, tested with a 10/1000 μs waveform per Figure 1 and Table 1 in the Vishay datasheet. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is critical for ensuring downstream components remain within their absolute maximum voltage ratings. The SMP24-M3/84A achieves this clamping performance while maintaining low profile and high surge robustness.