May 28, 2025
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In today's electronics landscape, transient voltage events pose significant risks to sensitive circuits. The SMAJ188CA-E3/5A from Vishay General Semiconductor emerges as a premier solution, offering 188V working voltage and 300W peak pulse power in a compact SMA package. As industries from automotive to telecom demand higher reliability, this TransZorb® TVS diode delivers exceptional clamping performance and AEC-Q101 qualification for critical applications. Discover why engineers worldwide trust this component for ESD protection.
The SMAJ188CA-E3/5A is a surface-mount bidirectional TVS diode designed for suppressing transient voltages in electronic circuits. Key attributes include:
| Parameter | Value | Source |
|---|---|---|
| Manufacturer | Vishay General Semiconductor | Datasheet |
| Package | DO-214AC (SMA) | Datasheet |
| Working Voltage (VWM) | 188V | IEC 61000-4-5 |
| Clamping Voltage (VC) | 328V @ IPP=910mA | 10/1000μs waveform |
| Peak Pulse Current (IPP) | 910mA | Datasheet |
| Operating Temperature | -55°C to +150°C | AEC-Q101 |
Bidirectional Protection: Guards against both positive and negative transients
Fast Response: Reacts to transients in picoseconds
Automotive Grade: AEC-Q101 qualified (order codes with E3/HM3 suffix)
High Power Handling: 300W peak pulse power (400W below 78V)
Low Leakage: Minimal impact on normal circuit operation
When selecting the SMAJ188CA-E3/5A:
Voltage Rating: Ensure VWM exceeds normal operating voltage
Clamping Ratio: Lower VC/VWM provides better protection
Package Constraints: Verify PCB space for SMA footprint (4.3×2.6mm)
Environmental Factors: For automotive use, specify AEC-Q101 versions
| Model | VWM | VC | Package | Key Difference |
|---|---|---|---|---|
| SMAJ188CA-E3/5A | 188V | 328V | SMA | Bidirectional, automotive option |
| SMAJ33A | 33V | 53.3V | SMA | Lower voltage variant |
| SMBJ188CA | 188V | 328V | SMB | Larger package (600W rating) |
Automotive Electronics: ECU protection against load dump (ISO 7637-2)
Industrial Controls: PLC I/O line protection
Telecom Equipment: DSL/Cable modem surge protection (ITU-T K.21)
Consumer Electronics: HDMI/USB ESD protection (IEC 61000-4-2)
According to Market Research Future, the TVS diode market will grow at 6.8% CAGR through 2027, driven by:
Increasing electronic content in vehicles (200+ TVS diodes per EV)
5G infrastructure requiring robust surge protection
Stricter EMC regulations worldwide
Emerging requirements for TVS diodes include:
Higher voltage ratings for EV battery systems (up to 1000V)
Integration with other protection components (like PPTCs)
Smaller packages for high-density PCBs
Yes, this device is fully RoHS and REACH compliant according to Vishay's documentation.
Unidirectional diodes protect against transients in one polarity (typically positive), while bidirectional (like the SMAJ188CA-E3/5A) protect against both positive and negative transients.
Lower clamping voltages (relative to the protected component's rating) provide better protection. The SMAJ188CA-E3/5A's 328V clamping ensures most 188V-rated components survive transients.
Yes, but within limits - the datasheet specifies a 0.01% duty cycle for 300W operation. For frequent transients, consider higher-rated models like the SMBJ series.
Glass passivation provides superior moisture resistance and long-term stability compared to organic coatings, critical for automotive and industrial environments.
The SMAJ188CA-E3/5A represents an optimal balance of protection performance and compact design. With its 188V working voltage, fast response time, and automotive qualification, it solves critical protection challenges across industries. As transient threats grow with increasing electronic complexity, this Vishay TVS diode offers reliable, standards-compliant protection.
Contact our technical sales team: [email protected] for pricing, samples, or application support.
