August 13, 2025
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In today's electronics landscape, robust transient voltage suppression (TVS) is critical to protect sensitive circuits from ESD and power surges. The SA120A-E3/54 from Vishay General Semiconductor stands out as a reliable unidirectional TVS diode, offering a 193V clamping voltage and 2.6A peak pulse current in a compact DO-204AC package. With industrial applications demanding higher resilience, this diode combines Vishay’s TransZorb technology with a wide operating temperature range (-55°C to +175°C), making it ideal for harsh environments. Read on to explore its key parameters, selection insights, and competitive advantages.
The SA120A-E3/54 is part of Vishay’s SAx series, designed for high-power transient suppression. Key features include:
Package: DO-204AC (Axial, DO-15)
Polarity: Unidirectional
Clamping Voltage: 193V (at 2.6A IPP)
Peak Pulse Power: 500W
Operating Temperature: -55°C to +175°C
| Parameter | Value | Source |
|---|---|---|
| Working Voltage (VWM) | 120V | Vishay Datasheet (SAx Series) |
| Breakdown Voltage (VBR) | 133V (min) | |
| Peak Pulse Current (IPP) | 2.6A (8/20μs waveform) | |
| Forward Voltage (VF) | 3.5V (at 10A) | |
| Power Dissipation (PD) | 3W | |
| Capacitance (CD) | Not specified | |
| ESD Protection (IEC 61000-4-2) | Not rated | |
| RoHS Compliance | Yes |
This diode is optimal for:
Industrial Power Supplies: Protects against voltage spikes in motor drives and PLCs.
Automotive Electronics: Withstands high-temperature environments (up to 175°C).
Telecom Equipment: Safeguards data lines from surges (though capacitance-sensitive designs may require alternatives).
Design Considerations:
For bidirectional protection, consider the SA120CA-E3/54.
Higher IPP needed? Upgrade to the SA150A-E3/54 (3.5A).
In a 120V AC-DC converter, the SA120A-E3/54 clamps transient surges to 193V, preventing damage to downstream ICs. A typical circuit layout:
[AC Input] → [Fuse] → [Varistor] → SA120A-E3/54 → [Bridge Rectifier]
Used in 12V/24V systems to handle load dump transients (per ISO 7637-2).
The global TVS diode market is projected to grow at 6.2% CAGR (2023–2030, MarketsandMarkets), driven by:
Increasing adoption of IoT devices requiring ESD protection.
Stringent automotive EMI/EMC standards.
The SA120A-E3/54’s 500W peak power and axial package make it a cost-effective choice for industrial bulk purchases.
| Model | VWM (V) | IPP (A) | Clamp Voltage | Package |
|---|---|---|---|---|
| SA120A-E3/54 | 120 | 2.6 | 193V | DO-204AC |
| P6KE120A (Littelfuse) | 120 | 5.0 | 171V | DO-204AC |
| SMBJ120A (Diodes Inc.) | 120 | 6.5 | 193V | SMB |
Why Choose SA120A-E3/54? Balances cost and performance for medium-power applications.
No. Its 120V working voltage is too high for USB (5V). Consider lower-voltage TVS diodes like the ESD5V0S1U.
Unidirectional (like SA120A-E3/54) protects against positive transients only; bidirectional handles both polarities.
It’s designed for short-duration transients (μs–ms). For lightning (kA-level), use dedicated arresters.
DO-204AC requires through-hole mounting, which is bulkier than SMD but offers better heat dissipation.
Yes, Vishay confirms compliance with RoHS Directive 2011/65/EU.
Vishay’s roadmap indicates higher IPP variants in the SAx series, targeting EV charging stations. Miniaturization (e.g., SMB packages) may also expand applications.
For pricing, samples, or technical support, contact Vishay’s authorized distributor:
Email: [email protected]
The SA120A-E3/54 delivers robust transient protection for industrial and automotive designs, backed by Vishay’s proven TransZorb technology. Its 193V clamping and wide temperature range make it a versatile choice against voltage spikes. Evaluate your circuit’s peak current and layout requirements to determine if this diode fits your needs.
