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Vishay General Semiconductor - Diodes Division SA33HE3/73
- Part No.:
- SA33HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33HE3/73.pdf
- Description:
- TVS DIODE 33VWM 59VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
SA33HE3/73 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for surge protection on signal and power lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 µs), clamping voltage of 53.3 V at 9.4 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA33HE3/73 datasheet, SA33HE3/73 pinout, SA33HE3/73 application, or SA33HE3/73 equivalent, this device is selected for robust ESD and lightning surge protection in automotive sensor interfaces, industrial I/O ports, and telecom line cards where bidirectional clamping, low leakage (<1.0 µA), and high surge current tolerance are required.
Technical Context
The SA33HE3/73 operates as a bi-directional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling fast response (<1 ns) to ESD and inductive switching transients.
It is rated for 175 °C maximum junction temperature and supports repetitive surge events at 0.01 % duty cycle. The device complies with AEC-Q101 stress testing including HTRB, HTGB, and temperature cycling-confirming suitability for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Ensures reliable turn-on during transients while avoiding false triggering |
| VC (Clamping Voltage) | 53.3 V at 9.4 A (10/1000 µs) - Limits downstream voltage stress to safe levels for protected ICs |
| IPPM (Peak Pulse Current) | 9.4 A - Sustains defined surge energy without degradation; derates above 25 °C ambient |
| PPPM (Peak Pulse Power) | 500 W - Handles standardized lightning-surge waveforms per IEC 61000-4-5 (10/1000 µs) |
| ID (Reverse Leakage) | <1.0 µA at 33 V - Minimizes standby power loss and avoids interference in high-impedance circuits |
| TJ max. | 175 °C - Enables operation in engine control units and other high-temperature automotive locations |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0. Matte tin-plated leads; no polarity marking (bi-directional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical electrical behavior in either direction; no cathode band; interchangeable lead orientation |
| Lead 1 | Connection to PCB trace or cable | Provides low-inductance path to protected node; solderable per J-STD-002 |
| Lead 2 | Connection to PCB trace or cable | Completes bidirectional clamping loop; same metallurgical structure as Lead 1 |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and across temperature; eliminates surface contamination effects |
| AEC-Q101 qualification | Validated for automotive applications including powertrain and body electronics per stress test requirements |
| 500 W peak pulse rating (10/1000 µs) | Meets IEC 61000-4-5 Level 4 surge immunity for industrial and automotive equipment |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping-critical for protecting 3.3 V or 5 V logic interfaces |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for long-term reliability |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensors from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing transients before they reach sensitive analog front-ends. Use Value: Maintains signal integrity under 12 V/24 V system surges up to ±100 V; enables compliance with ISO 16750-2 and AEC-Q100 stress profiles. | Use Scenario: Safeguarding 4–20 mA current-loop inputs in programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting surge energy away from precision op-amps and ADC drivers. Use Value: Clamps transients to ≤53.3 V within nanoseconds, preventing latch-up or damage to 24 V-rated input stages. |
| Telecom Line Card Protection | Consumer USB Port ESD Guard |
Use Scenario: Front-end protection for Ethernet PHYs and DSL line drivers subjected to lightning-induced surges on outdoor copper pairs. IC Role / Device Role / Timing Role: First-stage transient suppressor in multi-level protection schemes, handling bulk energy before MOV or GDT stages. Use Value: Withstands repeated 500 W surges without parameter shift-ensuring longevity in telco central office environments. | Use Scenario: Secondary ESD protection on USB 2.0 D+/D− lines behind primary polymer-based TVS, guarding against human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bi-directional clamp limiting voltage excursion to <53.3 V during 8 kV contact discharge. Use Value: Prevents data corruption and port lockup while maintaining signal rise/fall times compatible with 480 Mbps signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Uni-directional; 33 V VWM, 36.7–40.6 V VBR, same DO-214AC package but surface-mount | Requires polarity-aware layout; unsuitable for AC-coupled or floating lines | Select when board space constraints favor SMD and circuit topology permits unidirectional placement |
| 1.5KE33CA | Same bi-directional function; 33 V VWM, 36.7–40.6 V VBR, but DO-201AD package (larger, higher PPPM = 1500 W) | Higher surge capacity but larger footprint; less suitable for dense automotive modules | Choose for legacy designs requiring higher energy handling or existing DO-201AD footprints |
Compared with SMAJ33A-E3/5A and 1.5KE33CA, the SA33HE3/73 offers AEC-Q101 qualification and axial DO-15 form factor optimized for through-hole automotive harness connections-making it preferred for new ECU designs demanding qualification traceability and mechanical robustness.
Availability
SA33HE3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line-card surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SA33HE3/73 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, MOSFETs, and passive components with emphasis on reliability and automotive-grade performance.
The SAxxHE3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-reliability transient suppression in harsh environments-including under-hood automotive, industrial automation, and infrastructure communications equipment.
FAQ
What is the polarity configuration of the SA33HE3/73?
The SA33HE3/73 is a bi-directional TVS diode with symmetrical avalanche characteristics in both directions. It has no cathode marking and can be installed in either orientation on the PCB. This makes it ideal for protecting AC-coupled signals, differential buses like CAN, or floating power rails where polarity reversal may occur during transients.
Does the SA33HE3/73 meet automotive qualification standards?
Yes, the SA33HE3/73 is AEC-Q101 qualified, as confirmed by its HE3 suffix and documentation in Vishay's 88378 datasheet. It undergoes stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling-validating its suitability for automotive powertrain, chassis, and body electronics applications.
What is the clamping voltage of the SA33HE3/73 at its rated peak pulse current?
The SA33HE3/73 has a maximum clamping voltage (VC) of 53.3 V at 9.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 7 in the datasheet and defines the upper voltage limit imposed on protected circuitry during surge events.
How does the SA33HE3/73 differ from the SA33A variant?
The SA33HE3/73 is the AEC-Q101 qualified, RoHS-compliant, and whisker-resistant (JESD 201 Class 2) version of the SA33A. While both share identical electrical specs (VWM = 33 V, VBR = 36.7–40.6 V), only the SA33HE3/73 carries automotive qualification and enhanced plating-making it mandatory for Tier 1 automotive BOMs.
Can the SA33HE3/73 be used in place of a uni-directional TVS like SMAJ33A?
No-the SA33HE3/73 is bi-directional and lacks polarity marking, whereas SMAJ33A is uni-directional and requires correct anode/cathode orientation. Substituting them without circuit review risks failure to clamp negative transients or unintended forward conduction. Use SA33HE3/73 only where bidirectional protection is explicitly required and validated.
SA33HE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 8.5A
- 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)
SA33HE3/73 FAQ
1.How can I place an order for SA33HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33HE3/73 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 SA33HE3/73 reliable?
The price and inventory of SA33HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33HE3/73 is usually 5 days.
3.What payment methods are accepted for SA33HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33HE3/73?
SA33HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33HE3/73 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 SA33HE3/73?
For technical support, including SA33HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33HE3/73 requirements.
6.How does Aetrix verify that SA33HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA33HE3/73 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 SA33HE3/73 meets industry standards.
7.What is the process for return or replacement of SA33HE3/73?
All SA33HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA33HE3/73, 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 SA33HE3/73 part is unused and in its original packaging.
Return procedure for SA33HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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