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Vishay General Semiconductor - Diodes Division SMAJ33A-E3/5A
- Part No.:
- SMAJ33A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33A-E3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:31,534
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Product details
Overview
SMAJ33A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown range at 1 mA, clamps transients to ≤53.3 V at 7.5 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform) - ideal for safeguarding MOSFET gates, microcontroller I/O, and automotive sensor interfaces against ESD and inductive switching surges.
For engineers reviewing the SMAJ33A-E3/5A datasheet, SMAJ33A-E3/5A pinout, SMAJ33A-E3/5A application, or SMAJ33A-E3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification option (via HE3 suffix), and precise clamping performance under repetitive surge conditions up to 150 °C junction temperature.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 33 V, it avalanches into low-impedance conduction to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response (<1 ns), while the low incremental surge resistance minimizes clamping voltage overshoot during high-di/dt events.
Thermally, it uses the SMA (DO-214AC) package with RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation at TJ = –55 to +150 °C. The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
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 at 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | ≤53.3 V at 7.5 A - peak clamped voltage limiting stress on protected ICs |
| PPPM | 400 W (10/1000 μs) - surge energy handling capacity for common lightning/inductive transients |
| IFSM | 40 A - single half-sine surge rating supporting motor driver and relay coil suppression |
| TJ max | +150 °C - enables use in under-hood automotive and industrial power supply environments |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD footprint with 5.0 mm × 5.0 mm copper pad thermal design |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Avalanche conduction terminal | Connected to protected line; conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity without derating |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during fast transients, reducing risk of latch-up in CMOS ICs |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current over temperature and life |
| AEC-Q101 qualified variant available | Validated for automotive powertrain and body electronics applications requiring zero defect reliability |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground to clamp transients before they reach the transceiver's ESD structure. Use Value: Clamps 33 V-rated lines to ≤53.3 V within nanoseconds, preserving signal integrity and preventing damage to 5 V or 3.3 V interface ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay contact bounce and inductive kickback from solenoids. IC Role / Device Role / Timing Role: Mounted across input terminals to absorb 40 A surge currents from 24 V DC control circuits. Use Value: Withstands 40 A single-event surge and maintains <1 μA leakage at 33 V, ensuring no false triggering in high-impedance sensing paths. |
| Consumer Power Adapter Output | Motor Drive Gate Protection |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers to meet UL 1449 and IEC 62368-1 transient requirements. IC Role / Device Role / Timing Role: Placed across DC output rails to clamp flyback transformer ringing and line-induced spikes. Use Value: 400 W pulse rating handles repeated 10/1000 μs surges without degradation, supporting 5-year field reliability in consumer power supplies. |
Use Scenario: Protecting high-side and low-side gate drivers in BLDC motor inverters from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Connected between gate and source of power MOSFETs to clamp dv/dt-induced gate oxide stress. Use Value: Fast <1 ns response and low VC limit gate-source voltage to safe levels (<20 V), preventing unintended turn-on and device failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package | No functional difference; selected where halogen-free compliance is mandated (e.g., EU industrial equipment) | Direct drop-in replacement for SMAJ33A-E3/5A when halogen-free materials are required |
| SMAJ33CA-E3/5A | Bidirectional version with same VWM (33 V), symmetric clamping in both polarities, VBR = 36.7–40.6 V | Required for AC-coupled or floating signal lines (e.g., RS-485, audio), not suitable for DC rail protection | Choose only when bidirectional surge protection is needed; not interchangeable with SMAJ33A-E3/5A in unidirectional designs |
Compared with SMAJ33A-M3/5A, the SMAJ33A-E3/5A offers standard RoHS compliance without halogen restrictions; compared with SMAJ33CA-E3/5A, it provides optimized unidirectional clamping for DC power and signal rails, avoiding unnecessary cost and complexity in polarity-sensitive applications.
Availability
SMAJ33A-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter output protection requiring stable component supply and full traceability.
Supply support for SMAJ33A-E3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, repeatable clamping, and AEC-Q101 qualification are critical.
FAQ
What is the maximum clamping voltage of the SMAJ33A-E3/5A at its rated peak pulse current?
The SMAJ33A-E3/5A has a maximum clamping voltage (VC) of 53.3 V when subjected to its peak pulse current (IPPM) of 7.5 A under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay's datasheet revision 09-Jan-2024, Document Number 88390, and defines the upper voltage limit imposed on protected circuitry during surge events. Maintaining VC below this threshold ensures compatibility with 3.3 V and 5 V logic interfaces.
Is the SMAJ33A-E3/5A suitable for automotive applications?
Yes - while the base SMAJ33A-E3/5A is commercial-grade, it belongs to the AEC-Q101-qualified SMAJ family. Vishay offers the SMAJ33AHE3 variant (with HE3 suffix) that is fully AEC-Q101 qualified for automotive use. The SMAJ33A-E3/5A shares identical electrical and thermal specifications, making it suitable for prototyping and non-safety-critical automotive subsystems, provided qualification requirements are verified per end-application standards.
What does the "E3/5A" suffix indicate in SMAJ33A-E3/5A?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "5A" specifies the packaging format: 7500 units per 13-inch diameter plastic tape and reel. This differs from "E3/61", which uses 7-inch reels with 1800 units. Both share identical electrical performance and thermal ratings - the suffix solely identifies environmental compliance and logistics configuration, not functional differentiation.
How does the SMAJ33A-E3/5A compare to SMAJ33CA-E3/5A in terms of circuit implementation?
The SMAJ33A-E3/5A is unidirectional and must be oriented with cathode toward the protected line and anode to ground; the SMAJ33CA-E3/5A is bidirectional with no polarity marking and clamps symmetrically in both directions. They are not interchangeable: using SMAJ33CA-E3/5A in a DC rail application adds unnecessary cost and may reduce clamping margin due to doubled leakage path, while substituting SMAJ33A-E3/5A in AC signal lines fails to protect negative transients.
What thermal derating applies to the SMAJ33A-E3/5A above 25 °C ambient?
The SMAJ33A-E3/5A follows standard derating per Figure 2 in its datasheet: peak pulse power decreases linearly above 25 °C ambient, reaching ~70 % of 400 W at 75 °C and ~50 % at 100 °C. This reflects junction-to-ambient thermal resistance (RθJA = 120 °C/W) and requires appropriate PCB copper area (minimum 0.2″ × 0.2″ pads per terminal) to maintain safe TJ ≤ 150 °C during repetitive surges. Derating curves are validated per JEDEC test conditions.
SMAJ33A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33A-E3/5A FAQ
1.How can I place an order for SMAJ33A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33A-E3/5A 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 SMAJ33A-E3/5A reliable?
The price and inventory of SMAJ33A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33A-E3/5A?
SMAJ33A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33A-E3/5A 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 SMAJ33A-E3/5A?
For technical support, including SMAJ33A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33A-E3/5A requirements.
6.How does Aetrix verify that SMAJ33A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33A-E3/5A 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 SMAJ33A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33A-E3/5A?
All SMAJ33A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33A-E3/5A, 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 SMAJ33A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ33A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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