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Vishay General Semiconductor - Diodes Division SA78HE3/54
- Part No.:
- SA78HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA78HE3/54.pdf
- Description:
- TVS DIODE 78VWM 139VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,816
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Product details
Overview
SA78HE3/54 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on signal or power lines. It features 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 μs), 126 V maximum clamping voltage at 4 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA78HE3/54 datasheet, SA78HE3/54 pinout, SA78HE3/54 application, or SA78HE3/54 equivalent, this device is selected for robust overvoltage protection in automotive sensor interfaces, industrial I/O modules, and telecom line drivers where bidirectional surge immunity and high-temperature operation up to 175 °C are required.
Technical Context
The SA78HE3/54 operates as a bi-directional avalanche diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 μA at 78 V), while its low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced transients.
Designed for repetitive surge events at ≤0.01% duty cycle, the SA78HE3/54 delivers 500 W peak pulse power per 10/1000 μs waveform and maintains thermal stability via DO-204AC package with 3.0 W steady-state power dissipation at TL = 75 °C. It meets JESD22-B106 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 126 V at 4 A - Clamped voltage under full-rated 10/1000 μs surge; determines worst-case stress on downstream components. |
| PPPM | 500 W - Peak transient power handling capability; validates suitability for IEC 61000-4-5 Level 3/4 surge testing. |
| TJ max. | +175 °C - Maximum junction temperature; enables deployment in under-hood automotive or high-ambient industrial environments. |
| AEC-Q101 | Qualified - Certified for automotive electronics per stress test standard; supports PPAP documentation and long-term reliability validation. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.300" lead spacing; compatible with through-hole assembly and manual rework. |
Pinout & Package
SA78HE3/54 is a two-terminal bi-directional TVS diode in DO-204AC (DO-15) package. No polarity marking is applied; terminals are functionally identical and interchangeable. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, with 275 °C / 10 s maximum solder dip tolerance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (either end) | Bi-directional avalanche junction terminal | Either lead may connect to line or ground; symmetrical conduction enables single-device protection of AC or differential signals. |
| Leads (both) | Current path and thermal interface | Provide mechanical mounting and heat conduction to PCB copper; lead length ≥0.375" required for rated PD derating per Fig. 5. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR over time and temperature; eliminates risk of junction degradation under humidity or bias stress. |
| 500 W peak pulse power (10/1000 μs) | Supports EN 61000-4-5 2 Ω/12 Ω coupling network surges up to ±1 kV without failure or parameter shift. |
| AEC-Q101 qualification | Validates performance across temperature cycling, HTRB, and mechanical shock tests required for automotive ECUs and ADAS sensors. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during transient events; protects 80 V-rated MOSFETs and analog front-ends without derating margin loss. |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualified, halogen-free, and JESD201 Class 2 whisker-resistant construction for high-reliability production. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and MEMS pressure sensor outputs from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between signal line and chassis ground to limit transient excursions below IC absolute maximum ratings. Use Value: Withstands 12 V system load dump spikes (up to 60 V for 400 ms) and suppresses 500 W surges without degradation, preserving sensor accuracy and communication integrity. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers against field wiring faults and electrostatic discharge. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across input terminals to shunt induced transients before they reach precision op-amps and ADCs. Use Value: 78 V VWM aligns with 24 V industrial supply rails; 126 V VC ensures downstream 100 V-rated protection devices remain within safe operating area during surge events. |
| Telecom Line Driver Protection | Power Supply Rail Clamp |
Use Scenario: Shielding RS-485/RS-422 transceiver I/O pins from lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: Primary surge suppression device mounted at connector entry point, operating in parallel with GDT or MOV secondary protection. Use Value: Sub-1 ns response time and symmetrical clamping enable effective suppression of 10/1000 μs common-mode surges up to 4 A without signal distortion or latch-up. |
Use Scenario: Adding secondary overvoltage clamp on 48 V DC power distribution rails in base station power supplies. IC Role / Device Role / Timing Role: Fast-acting backup clamp triggered when primary regulation fails or during hot-swap insertion transients. Use Value: 175 °C TJ rating allows placement near power inductors or MOSFETs; DO-204AC package supports high-current trace routing without thermal bottleneck. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA | Same VWM (78 V), same DO-214AA package, but lower PPPM (600 W) and higher VC (127 V); surface-mount only. | Requires SMT reflow process and PCB real estate; not suitable for through-hole legacy designs or manual repair. | Select SMBJ78CA only when board space is constrained and SMT assembly infrastructure is available. |
| 1.5KE78CA | Higher PPPM (1500 W), larger DO-201AD package, same VWM and bi-directionality; lead length and thermal mass differ significantly. | Used in high-energy surge zones (e.g., AC mains entry); over-spec'd for signal-line protection and incompatible with DO-15 footprint. | Choose 1.5KE78CA only for primary-level AC/DC input protection where energy absorption exceeds 500 W requirements. |
Compared with SMBJ78CA and 1.5KE78CA, SA78HE3/54 uniquely combines AEC-Q101 qualification, DO-204AC through-hole compatibility, and optimized 500 W/126 V clamping for cost-sensitive automotive and industrial signal-line protection-without requiring layout redesign or over-engineered power handling.
Availability
SA78HE3/54 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, and telecom line driver circuits requiring stable component supply, long-lifecycle support, and AEC-Q101 compliance.
Supply support for SA78HE3/54 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, efficiency, and automotive-grade qualification.
The SAxxHE3 series is part of Vishay's TransZorb® TVS portfolio, engineered specifically for high-reliability transient suppression in harsh environments-including under-hood automotive, factory automation, and outdoor communications infrastructure.
FAQ
What is the clamping voltage of SA78HE3/54 at its rated peak pulse current?
The SA78HE3/54 has a maximum clamping voltage (VC) of 126 V at 4 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per Figure 7 in the Vishay datasheet 88378 and defines the upper voltage limit imposed on protected circuitry during a full-rated surge event. The SA78HE3/54 maintains this clamping performance across its qualified operating temperature range.
Is SA78HE3/54 suitable for automotive applications?
Yes, SA78HE3/54 is AEC-Q101 qualified and explicitly rated for automotive use. Its DO-204AC package, 175 °C maximum junction temperature, and validated performance across temperature cycling, high-temperature reverse bias, and mechanical shock make it appropriate for engine control units, body electronics, and ADAS sensor interfaces. The HE3 suffix confirms AEC-Q101 compliance per the ordering information table in datasheet 88378.
Does SA78HE3/54 have polarity markings?
No, SA78HE3/54 is a bi-directional TVS diode and carries no polarity marking on the package. As stated in the "Mechanical Data" section of datasheet 88378, "no marking on bi-directional types." Both leads are functionally identical, allowing flexible placement across differential or AC-coupled signal paths without orientation constraints during assembly.
What is the standoff voltage rating of SA78HE3/54?
The standoff voltage (VWM) of SA78HE3/54 is 78 V - the maximum DC or continuous peak voltage the device will block without entering avalanche conduction. This value is confirmed in the "Electrical Characteristics" table on page 2 of Vishay document 88378 and ensures compatibility with 48 V and 60 V nominal systems while providing sufficient margin above normal operating voltage.
How does the HE3 suffix differ from E3 in SA78HE3/54?
The HE3 suffix in SA78HE3/54 denotes RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance, whereas E3 indicates RoHS compliance only for commercial-grade parts. Per the "Mechanical Data" section of datasheet 88378, "Base P/NHE3 - RoHS compliant, AEC-Q101 qualified," confirming that SA78HE3/54 meets automotive reliability standards not required for SA78E3/54.
SA78HE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 3.6A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA78HE3/54 FAQ
1.How can I place an order for SA78HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA78HE3/54 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA78HE3/54 reliable?
The price and inventory of SA78HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA78HE3/54 is usually 5 days.
3.What payment methods are accepted for SA78HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA78HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA78HE3/54?
SA78HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA78HE3/54 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA78HE3/54?
For technical support, including SA78HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA78HE3/54 requirements.
6.How does Aetrix verify that SA78HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA78HE3/54 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA78HE3/54 meets industry standards.
7.What is the process for return or replacement of SA78HE3/54?
All SA78HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA78HE3/54, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA78HE3/54 part is unused and in its original packaging.
Return procedure for SA78HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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