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Vishay General Semiconductor - Diodes Division SMAJ33-E3/5A
- Part No.:
- SMAJ33-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33-E3/5A.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,476
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Product details
Overview
SMAJ33-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 33 V stand-off voltage (VWM), 59.0 V maximum clamping voltage (VC) at 6.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ33-E3/5A datasheet, SMAJ33-E3/5A pinout, SMAJ33-E3/5A application, or SMAJ33-E3/5A equivalent, this page delivers verified electrical parameters, JEDEC-compliant packaging details, RoHS-compliant sourcing status, and direct alternative part comparisons for ESD and surge protection design-in.
Technical Context
The SMAJ33-E3/5A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transient overvoltages. Its breakdown voltage is specified at 36.7–44.9 V (IT = 1 mA), and it maintains ≤1.0 µA reverse leakage at 33 V stand-off - critical for low-power sensor line protection.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = +150 °C, supporting operation in automotive under-hood and industrial control environments. The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for circuit-level overvoltage immunity. |
| VBR (min/max) | 36.7 V / 44.9 V at IT = 1 mA - Confirms reliable avalanche initiation within specification window for robust transient suppression. |
| VC @ IPPM | 59.0 V at 6.8 A - Clamping voltage during 10/1000 µs surge; defines worst-case stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 3 surges (1 kV/42 Ω). |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush current tolerance in DC power rails. |
| TJ Range | −55 °C to +150 °C - Full industrial temperature range operation without derating up to 75 °C ambient. |
Pinout & Package
DO-214AC (SMA) surface-mount package: 2-terminal, single-row gull-wing lead configuration; cathode indicated by band marking on body; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (for unidirectional operation) | Connected to protected line side; conducts during positive transients when cathode is biased higher than anode. |
| Cathode | Clamping reference terminal (marked with band) | Connected to ground or lower-potential rail; establishes clamping path for negative-going transients on bidirectional lines via external configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress without parameter drift. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly at 260 °C peak. |
| RoHS-compliant & halogen-free molding compound | Meets UL 94 V-0 flammability rating and environmental compliance for global industrial and automotive deployments. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive CMOS inputs. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MCU GPIO and relay coil return path to clamp negative flyback spikes. Use Value: Limits transient voltage to ≤59.0 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. |
Use Scenario: Surge suppression on LIN bus lines exposed to load dump and jump-start conditions in vehicle door modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN transceiver VCC and data lines to absorb ISO 7637-2 Pulse 1/2a energy. Use Value: Withstands 400 W pulses while maintaining <1 µA leakage at 33 V, preserving bus idle-state integrity. |
| Power Supply Input Stage | Industrial Sensor Signal Conditioning |
|
Use Scenario: Secondary-side overvoltage clamping in 24 V DC-DC converter outputs feeding PLC I/O cards. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to limit fault voltage during regulator failure or feedback loop loss. Use Value: Clamps to 59.0 V within nanoseconds, preventing damage to downstream 36 V-rated op-amps and ADC front-ends. |
Use Scenario: ESD and surge protection for 4–20 mA current-loop transmitters interfacing with pressure/temperature sensors. IC Role / Device Role / Timing Role: Bidirectional protection implemented using two SMAJ33-E3/5A devices in series-opposed configuration. Use Value: Achieves symmetrical ±33 V standoff and ≤59 V clamping in both directions without adding capacitance-sensitive components. |
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-E3/5A | Lower VBR range (36.7–40.6 V) and tighter VWM tolerance; clamps at 53.3 V @ 7.5 A. | Better suited for precision 3.3 V or 5 V rail protection where lower clamping voltage improves safety margin. | Select SMAJ33A-E3/5A when system-level testing confirms lower VC is required and VBR consistency is prioritized over peak power headroom. |
| SMCJ33A-E3/57T | Higher PPPM (1500 W), larger DO-214AB (SMC) package, same VWM/VC specs but 17.9 A IPPM. | Used where higher surge repetition rate or longer-duration transients (e.g., AC mains coupling) demand greater energy absorption. | Choose SMCJ33A-E3/57T only if PCB layout allows larger footprint and thermal management supports higher IPPM duty cycles. |
Compared with SMAJ33-E3/5A, SMAJ33A-E3/5A offers lower clamping voltage at the cost of reduced peak power margin, while SMCJ33A-E3/57T trades compactness for 3.75× higher surge energy handling - selection depends on board space, thermal constraints, and IEC/ISO test profile severity.
Availability
SMAJ33-E3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and power supply input stage designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ33-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, and protection devices with emphasis on reliability, ruggedness, and AEC-Q101 qualification.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where consistent clamping performance and moisture-resistant packaging are mandatory.
FAQ
What is the polarity configuration of SMAJ33-E3/5A?
SMAJ33-E3/5A is a unidirectional TVS diode, with the banded end denoting the cathode terminal. It conducts in forward bias during positive transients relative to cathode and clamps reverse overvoltages above its 33 V stand-off level. This configuration is optimized for DC power rail and signal line protection where polarity is fixed.
Does SMAJ33-E3/5A meet automotive qualification standards?
SMAJ33-E3/5A is RoHS-compliant and rated for industrial temperature range (−55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive applications, Vishay offers the SMAJ33HE3/5A variant with AEC-Q101 certification - SMAJ33-E3/5A should be used only in non-safety-critical industrial or consumer systems.
What is the maximum clamping voltage of SMAJ33-E3/5A under surge conditions?
The maximum clamping voltage of SMAJ33-E3/5A is 59.0 V at 6.8 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed per Vishay Document Number 88390 and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Can SMAJ33-E3/5A be used for bidirectional transient protection?
SMAJ33-E3/5A is unidirectional, but bidirectional protection can be achieved by connecting two SMAJ33-E3/5A devices in series-opposing configuration (anode-to-anode or cathode-to-cathode). This yields symmetrical ±33 V stand-off and ≤59 V clamping in both directions - confirmed in Vishay's application guidance for SMAJ family.
What is the thermal resistance of SMAJ33-E3/5A in standard mounting conditions?
SMAJ33-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes JEDEC-standard PCB layout and is essential for calculating safe operating area under repetitive surge conditions.
SMAJ33-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:
- 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):
- 6.8A
- 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)
SMAJ33-E3/5A FAQ
1.How can I place an order for SMAJ33-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33-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 SMAJ33-E3/5A reliable?
The price and inventory of SMAJ33-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 SMAJ33-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33-E3/5A?
SMAJ33-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33-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 SMAJ33-E3/5A?
For technical support, including SMAJ33-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33-E3/5A requirements.
6.How does Aetrix verify that SMAJ33-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33-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 SMAJ33-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33-E3/5A?
All SMAJ33-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33-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 SMAJ33-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ33-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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