May 15, 2025
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In today's electronics landscape, robust transient voltage suppression (TVS) is critical for protecting sensitive components from ESD and voltage spikes. The SMAJ8.0CA-E3/5A from Vishay General Semiconductor stands out with its 13.6V clamping voltage and 29.4A peak pulse current, making it ideal for automotive, industrial, and telecom applications. This bidirectional TVS diode combines 400W peak power dissipation with a compact SMA package, addressing modern design challenges. Read on to explore its technical advantages, selection criteria, and how it compares to alternatives.
The SMAJ8.0CA-E3/5A is a surface-mount TVS diode in a DO-214AC (SMA) package, part of Vishay's TransZorb series. Key specifications include:
| Parameter | Value | Source |
|---|---|---|
| Working Voltage (VWM) | 8 V | Vishay Datasheet (SMAJ_A Series) |
| Clamping Voltage (VC) | 13.6 V @ 29.4A | |
| Breakdown Voltage (VBR) | 8.89 V (min) | |
| Peak Pulse Current (IPP) | 29.4 A (10/1000μs) | |
| Power Dissipation (Pppm) | 400 W | |
| Operating Temperature | -55°C to +150°C | |
| Polarity | Bidirectional | |
| Forward Voltage (VF) | 3.5 V | |
| Package | DO-214AC (SMA) | |
| Compliance | AEC-Q101 (Automotive), RoHS |
Glass-passivated chip junction for reliability
Fast response time (<1 ps typical) for ESD protection
Low incremental surge resistance (0.5 Ω max)
MSL Level 1 rated (260°C peak reflow)
Automotive-grade options available (P/NHE3/HM3)
Follow these steps to determine if the SMAJ8.0CA-E3/5A fits your design:
Voltage Rating: Ensure working voltage (8V) exceeds circuit operating voltage.
Clamping Needs: Verify 13.6V clamping protects downstream ICs (e.g., 5V/3.3V logic).
Current Requirements: Check if 29.4A IPP covers expected transients.
Package Constraints: SMA footprint (4.3×2.6mm) suits space-limited PCBs.
Environment: -55°C to +150°C range supports harsh conditions.
| Model | VWM | VC | IPP | Package | Best For |
|---|---|---|---|---|---|
| SMAJ8.0CA-E3/5A | 8V | 13.6V | 29.4A | SMA | General-purpose ESD protection |
| SMBJ8.0CA | 8V | 13.6V | 24.2A | SMB | Higher power (600W) designs |
| P6SMB8.0CA | 8V | 13.6V | 58.1A | SMB | High-current industrial apps |
The SMAJ8.0CA-E3/5A is widely used in:
Automotive: CAN bus, ECU signal line protection (AEC-Q101 qualified)
Industrial: PLC I/O ports, sensor interfaces
Consumer: USB ports, HDMI lines in TVs/PCs
Telecom: DSL/T1/E1 line cards
Source: Vishay Application Note AN913
According to MarketsandMarkets, the TVS diode market is projected to grow at 6.2% CAGR through 2027, driven by:
Increasing ESD sensitivity in 5G/IoT devices
Automotive electrification (48V systems require robust protection)
Demand for miniaturized components (SMA package advantage)
Emerging requirements for the SMAJ8.0CA-E3/5A and similar devices include:
Lower capacitance (<1pF) for high-speed data lines (USB4, PCIe 5.0)
Higher power density (500W+ in SMA packages)
Integration with EMI filters (e.g., TVS+ferrite bead combinations)
No. The 8V working voltage is too low for 12V systems (typically 15V-18V VWM required). Consider SMAJ15CA-E3 instead.
"CA" denotes bidirectional (clamps both positive/negative spikes), while "A" is unidirectional.
Yes, but verify capacitance (not specified in datasheet). For USB 3.2 Gen 2 (10Gbps), consider low-capacitance alternatives like ESD9X3.3ST5G.
Competitive for SMA packages (Littelfuse SMAJ series: 400W; ON Semiconductor: 300W). SMB packages offer higher ratings (600W).
Vishay rates it for >10,000 pulses at 29.4A (10/1000μs, 0.01% duty cycle). Beyond this, degradation may occur.
The SMAJ8.0CA-E3/5A offers a balanced solution for transient protection in 8V systems, combining Vishay's proven TransZorb technology with industry-standard packaging. Its 400W dissipation and automotive readiness make it a versatile choice across sectors. For volume pricing or technical support, contact our team at [email protected].
