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Vishay General Semiconductor - Diodes Division SA18HE3/54
- Part No.:
- SA18HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA18HE3/54.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,156
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Product details
Overview
SA18HE3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features 54 V stand-off voltage (VWM), 60 V minimum breakdown voltage (VBR), 29.2 V maximum clamping voltage (VC) at 17.1 A peak pulse current, 500 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA18HE3/54 datasheet, SA18HE3/54 pinout, SA18HE3/54 application, or SA18HE3/54 equivalent, this part is selected for robust ESD and surge protection in 12 V–24 V automotive subsystems, industrial I/O interfaces, and DC power input stages where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 0.48), and high surge reliability are required.
Technical Context
The SA18HE3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling stable reverse-biased clamping behavior under transient stress. Its uni-directional polarity-marked by cathode band-supports integration into DC-biased circuits without AC coupling concerns, and its 175 °C max junction temperature supports under-hood automotive deployment.
It delivers 500 W peak pulse power per 10/1000 µs waveform at TA = 25 °C, with derating to ~250 W at 100 °C ambient. Clamping performance is validated up to 17.1 A IPPM, with incremental surge resistance <0.3 Ω derived from VC – VBR / IPPM, ensuring minimal voltage overshoot during fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 48 V nominal systems. |
| VBR (min) | 60 V at 1 mA - Guaranteed avalanche onset voltage; ensures reliable triggering above normal operating rail. |
| VC (max) | 29.2 V at 17.1 A - Maximum clamped voltage seen by protected circuit during 500 W transient; defines worst-case stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling capability with 10/1000 µs waveform; qualifies for ISO 7637-2 Pulse 1, 2a, and 5a automotive surge tests. |
| IPPM | 17.1 A - Corresponding peak current at VC; used to size series impedance and verify coordination with upstream fuses. |
| TJ max | 175 °C - Maximum junction temperature; enables placement near heat sources in engine control units and body electronics modules. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥ 8 kV); suitable for ASIL-B relevant subsystems. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0. Matte tin-plated leads, solderable per J-STD-002/JESD 22-B102. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; establishes clamping path for positive transients on cathode side. |
| Cathode | Protected line interface | Connected to line under protection (e.g., battery feed, sensor supply); conducts avalanche current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics across temperature and lifetime; eliminates surface leakage drift in humid environments. |
| 500 W peak pulse power (10/1000 µs) | Supports full compliance with ISO 7637-2 Level III and SAE J1113-11 test profiles without derating or parallel staging. |
| Clamping ratio VC/VBR ≈ 0.48 | Minimizes voltage overshoot relative to breakdown; reduces risk of latch-up or gate oxide damage in protected MOSFETs and microcontrollers. |
| AEC-Q101 qualification | Validates reliability for automotive applications including powertrain, chassis, and ADAS modules with extended temperature and life requirements. |
| DO-204AC mechanical robustness | Withstands 275 °C solder dip (10 s), JESD 201 Class 2 whisker resistance, and mechanical shock per AEC-Q200; suitable for reflow and wave soldering. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery feed line in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed between fuse and DC-DC converter input to limit transient voltage to ≤30 V. Use Value: Prevents overvoltage shutdown or damage to 40 V-rated buck controller ICs during 120 V/100 ms load dump events. |
Use Scenario: Analog output line (0–10 V) from pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry to suppress ESD (IEC 61000-4-2 ±8 kV contact) and inductive kickback. Use Value: Maintains signal integrity below 1 % error band by limiting clamping excursion to 29.2 V while adding <0.5 pF parasitic capacitance. |
| DC Motor Drive Gate Protection | Telecom DC Power Interface |
|
Use Scenario: High-side N-channel MOSFET gate drive line in 24 V brushless motor controller subject to back-EMF spikes. IC Role / Device Role / Timing Role: Uni-directional clamp referenced to gate driver IC ground, protecting gate oxide from >20 V transients. Use Value: Enables use of cost-effective 30 V gate drivers instead of 60 V rated parts by holding gate-source voltage within safe margin. |
Use Scenario: -48 V DC input stage of telecom base station remote radio head (RRH) power supply. IC Role / Device Role / Timing Role: Standoff-rated TVS on input bus to absorb lightning-induced surges (IEC 61000-4-5 2 kV/1 kA combination wave). Use Value: Survives repeated 500 W surges without parameter shift, verified over 1000 cycles per AEC-Q101 stress profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/5T | Same VWM (54 V), same DO-214AC (SMA) package; lower PPPM (400 W), higher VC (93.6 V at 4.3 A). | Lower surge capacity suits consumer-grade 12 V supplies but insufficient for automotive load dump. | Select SMAJ54A-E3/5T only for space-constrained non-automotive designs where 400 W rating suffices. |
| 1.5KE56A | Higher VWM (49.5 V), larger DO-204AL (DO-27) package; same PPPM (500 W), higher VC (93.6 V at 5.3 A). | Larger footprint and looser clamping limit compatibility with tight-voltage-margin ICs. | Choose 1.5KE56A when board layout allows DO-27 and system can tolerate 93.6 V clamping during surge. |
Compared with SMAJ54A-E3/5T and 1.5KE56A, SA18HE3/54 offers superior clamping performance (29.2 V vs. ≥93.6 V) and AEC-Q101 qualification-critical for automotive and industrial systems requiring precise voltage limiting and long-term reliability under thermal cycling.
Availability
SA18HE3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power inputs requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SA18HE3/54 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SAxxA series was developed specifically for high-reliability transient suppression in automotive and industrial environments, targeting robust clamping, low leakage, and AEC-Q101-compliant operation across extended temperature ranges.
FAQ
What is the clamping voltage of SA18HE3/54 at its rated peak pulse current?
The SA18HE3/54 has a maximum clamping voltage (VC) of 29.2 V at 17.1 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The low VC ensures compatibility with 30 V-rated downstream components. SA18HE3/54 maintains this clamping performance across its full operating temperature range (–55 °C to +175 °C).
Is SA18HE3/54 suitable for automotive applications?
Yes, SA18HE3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 175 °C maximum junction temperature, glass-passivated junction, and validation across temperature cycling, HTRB, and ESD (HBM ≥ 8 kV) meet stringent automotive reliability requirements. SA18HE3/54 is commonly deployed in engine control units, body control modules, and ADAS power supplies where ISO 7637-2 compliance is mandatory.
What does the "HE3" suffix indicate in SA18HE3/54?
The "HE3" suffix in SA18HE3/54 denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this variant from commercial-grade "E3" parts (e.g., SA18E3/54), which lack automotive qualification. The "54" refers to the preferred package code for 13″ paper tape and reel packaging (4000 pcs/reel). SA18HE3/54 is not interchangeable with non-HE3 variants in automotive designs requiring certified reliability.
How does SA18HE3/54 compare to bi-directional TVS diodes like SA18CA?
SA18HE3/54 is uni-directional and features a cathode band for polarity-sensitive placement on DC-biased lines, whereas SA18CA is bi-directional with no polarity marking and symmetric clamping in both directions. SA18HE3/54 offers tighter clamping (29.2 V vs. 32.4 V for SA18CA at same IPPM) and is optimized for DC rail protection. SA18HE3/54 cannot replace SA18CA in AC-coupled or floating signal paths without circuit redesign.
What is the maximum steady-state power dissipation of SA18HE3/54?
The SA18HE3/54 has a maximum steady-state power dissipation (PD) of 3.0 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C. This rating applies to continuous DC or low-frequency reverse leakage conditions-not transient suppression. In normal operation, leakage current remains below 1 µA at 54 V, resulting in negligible steady-state power loss. SA18HE3/54 is not intended for continuous power regulation; its design purpose is single-event transient clamping.
SA18HE3/54 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SA18HE3/54 FAQ
1.How can I place an order for SA18HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA18HE3/54 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 SA18HE3/54 reliable?
The price and inventory of SA18HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA18HE3/54 is usually 5 days.
3.What payment methods are accepted for SA18HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA18HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA18HE3/54?
SA18HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA18HE3/54 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 SA18HE3/54?
For technical support, including SA18HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA18HE3/54 requirements.
6.How does Aetrix verify that SA18HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA18HE3/54 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 SA18HE3/54 meets industry standards.
7.What is the process for return or replacement of SA18HE3/54?
All SA18HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA18HE3/54, 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 SA18HE3/54 part is unused and in its original packaging.
Return procedure for SA18HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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