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Vishay General Semiconductor - Diodes Division SMA5J33HE3/5A
- Part No.:
- SMA5J33HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J33HE3/5A.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,752
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Product details
Overview
SMA5J33HE3/5A from Vishay General Semiconductor is a uni-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for high-energy surge protection on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR), 500 W peak pulse power (PPPM), and clamps transients to ≤53.3 V at 9.4 A IPPM - used in automotive power supply rail protection and industrial sensor interface circuits.
For engineers reviewing the SMA5J33HE3/5A datasheet, SMA5J33HE3/5A pinout, SMA5J33HE3/5A application, or SMA5J33HE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by overvoltage events exceeding its reverse stand-off voltage of 33 V. Its silicon avalanche structure provides sub-nanosecond response time and stable clamping under 10/1000 μs surge waveforms.
Designed for robustness in harsh environments, it meets MSL Level 1 per J-STD-020 (260 °C reflow peak), passes JESD 201 Class 2 whisker testing (HE3 suffix), and delivers 500 W peak pulse power dissipation with thermal resistance RθJA = 80 °C/W and RθJL = 25 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 36.7 V / 40.6 V - guaranteed avalanche breakdown range at 1 mA test current |
| VC @ IPPM | ≤53.3 V - clamped voltage during 9.4 A 10/1000 μs surge, limiting downstream stress |
| PPPM | 500 W - peak transient energy handling capability under standard waveform |
| TJ max. | +150 °C - enables operation in under-hood automotive and industrial ambient conditions |
| Polarity | Uni-directional - cathode band marked; blocks forward current above ~3.5 V (VF @ 25 A) |
| Package | DO-214AC (SMA) - surface-mount outline with 5.28 mm length, 4.50 mm width, 2.29 mm height |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified (HE3 suffix), UL 94 V-0 rated compound. Cathode band denotes terminal 1 (cathode); anode is unmarked terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection in uni-directional clamp configuration | Connected to protected line; conducts when transient exceeds VBR, shunting current to ground |
| Anode (unmarked end) | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| Glass passivated junction | Enhances long-term stability and leakage performance under high-humidity or high-bias stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 rating | Enables single-reflow assembly without moisture sensitivity concerns (peak 260 °C) |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability applications with >10 years field life requirement |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 16750-2) and alternator switching transients. IC Role / Device Role / Timing Role: Primary clamping element placed between power input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤53.3 V, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at VWM) parallel-connected protector on signal line to ground. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) without distorting mV-level sensor signals due to minimal leakage (<1 μA at 33 V). |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding PoE-powered Ethernet PHY interfaces against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: First-stage transient suppressor on 48 V DC input before DC/DC isolation stage. Use Value: Handles 500 W surge energy while maintaining <1 nA leakage at 33 V, preserving standby power budget. | Use Scenario: Input-stage surge suppression in universal-input AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Parallel-mounted across bulk capacitor input to absorb differential-mode line surges (IEC 61000-4-5, 2 kV) Use Value: Withstands 40 A IFSM (8.3 ms half-sine), enabling robustness against repeated inrush-related overstress events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J33A-E3/5A | Commercial-grade (non-AEC-Q101), same electrical specs and DO-214AC package | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation |
| SMC5J33AHE3/5A | Same AEC-Q101 qualification but in larger DO-214AB (SMC) package; 1500 W PPPM rating | Higher surge capacity but requires larger PCB footprint and different pad layout | Choose when system-level surge tests exceed 500 W (e.g., ISO 7637-2 Pulse 5b) and board space permits larger package |
Compared with SMA5J33A-E3/5A, the SMA5J33HE3/5A adds automotive qualification and whisker resistance without altering clamping behavior; versus SMC5J33AHE3/5A, it trades surge margin for compact size - critical for space-constrained automotive body control modules.
Availability
SMA5J33HE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 compliance and long-lifecycle support.
Supply support for SMA5J33HE3/5A 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 and application-specific performance.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered for high-power-density transient suppression in automotive, industrial, and communications equipment where space, thermal performance, and qualification rigor are critical.
FAQ
What is the maximum clamping voltage of the SMA5J33HE3/5A under a 10/1000 µs surge?
The SMA5J33HE3/5A clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 9.4 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals with specified mounting conditions (0.2" × 0.2" copper pads), ensuring predictable overvoltage limiting for downstream ICs and power stages in the SMA5J33HE3/5A application circuit.
Is the SMA5J33HE3/5A suitable for automotive applications?
Yes, the SMA5J33HE3/5A is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and infotainment systems. Its HE3 suffix confirms compliance with JESD 201 Class 2 whisker testing and MSL Level 1 reflow capability - all verified requirements for the SMA5J33HE3/5A in under-hood and cabin environments.
What does the "HE3" suffix indicate in SMA5J33HE3/5A?
The "HE3" suffix in SMA5J33HE3/5A denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this grade from commercial "E3" variants and confirms suitability for high-reliability automotive and industrial deployments where long-term metallurgical stability is mandatory for the SMA5J33HE3/5A.
How does the SMA5J33HE3/5A differ from bi-directional TVS diodes like SMA5J33CA?
The SMA5J33HE3/5A is uni-directional and features a cathode band marking, allowing it to block forward current above ~3.5 V while clamping reverse transients above 33 V. In contrast, SMA5J33CA is bi-directional with no polarity marking and clamps symmetrically in both directions - making the SMA5J33HE3/5A appropriate for DC power rails where forward conduction must be controlled.
What is the thermal resistance of the SMA5J33HE3/5A, and how does it affect PCB layout?
The SMA5J33HE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W and junction-to-lead (RθJL) of 25 °C/W. To maintain safe operation near its 150 °C max junction temperature, PCB layout must use minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - a requirement explicitly defined in the SMA5J33HE3/5A datasheet for rated power derating.
SMA5J33HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J33HE3/5A FAQ
1.How can I place an order for SMA5J33HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J33HE3/5A 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 SMA5J33HE3/5A reliable?
The price and inventory of SMA5J33HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J33HE3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J33HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J33HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J33HE3/5A?
SMA5J33HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J33HE3/5A 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 SMA5J33HE3/5A?
For technical support, including SMA5J33HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J33HE3/5A requirements.
6.How does Aetrix verify that SMA5J33HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J33HE3/5A 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 SMA5J33HE3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J33HE3/5A?
All SMA5J33HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J33HE3/5A, 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 SMA5J33HE3/5A part is unused and in its original packaging.
Return procedure for SMA5J33HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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