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Vishay General Semiconductor - Diodes Division SMAJ33AHE3_A/H
- Part No.:
- SMAJ33AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AHE3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
SMAJ33AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 7.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ33AHE3_A/H datasheet, SMAJ33AHE3_A/H pinout, SMAJ33AHE3_A/H application, or SMAJ33AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.39), unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on standard PCB pads per JEDEC DO-214AC footprint.
Technical Context
This TVS diode operates as a fast-acting shunt protector, leveraging an avalanche breakdown mechanism to clamp transient surges before they damage downstream components. Its 1.0 μA max reverse leakage at 33 V ensures minimal standby power loss, while the 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined pad layout conditions.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive surge) immunity requirements when applied with appropriate PCB layout. Its 0.01 % duty cycle rating enables repetitive surge handling only below 78 V - above that threshold, derated to 300 W per Vishay's Fig. 2 curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping onset |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - precise avalanche initiation range; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 53.3 V at IPPM = 7.5 A - limits voltage seen by protected circuit during 10/1000 μs surge; clamping ratio = 1.39 |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for single transient events; derates to 300 W above 78 V |
| ID (Reverse Leakage) | 1.0 μA max at VWM - negligible DC loading on supply rail; critical for low-power sensor interfaces |
| TJ max. | +150 °C - enables use in under-hood automotive environments and industrial enclosures without forced cooling |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per AEC specification |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; carries surge current to reference plane |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 33 V rail); avalanche conduction initiates here during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump precursor) in 12 V systems |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive electronics including engine control units, body controllers, and ADAS sensor interfaces |
| Low clamping voltage (53.3 V @ 7.5 A) | Provides 10.7 V headroom below typical 64 V load-dump clamp threshold, safeguarding 48 V/33 V logic rails |
| MSL Level 1 (260 °C reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift in harsh environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 33 V CAN FD or LIN bus transceivers and microcontrollers from load dump and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VCC rail and ground, responding within <1 ps to divert surge energy. Use Value: Limits rail voltage to ≤53.3 V during 400 W transients, preventing latch-up or gate oxide damage in 33 V-rated ICs. |
Use Scenario: Safeguarding analog outputs (4–20 mA, 0–10 V) and digital I/O of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at connector entry point to absorb ESD (±15 kV contact) and EFT (40 A, 5/50 ns) events. Use Value: 1.0 μA leakage preserves signal integrity; 53.3 V clamping prevents ADC input saturation during field-induced surges. |
| Consumer Device USB Power Input | Telecom Equipment DC Feeder Line |
Use Scenario: Securing 5 V/9 V/12 V USB PD input stages in smart home hubs and portable monitors against AC adapter transients and hot-plug spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of buck converter input, activated before internal FETs experience overstress. Use Value: 33 V VWM allows clean operation across full USB PD profile; 400 W rating handles worst-case adapter fault energy. |
Use Scenario: Protecting -48 V DC feeder lines feeding remote radio units (RRUs) and baseband units in 4G/5G macro cell sites. IC Role / Device Role / Timing Role: Unidirectional TVS configured with cathode to -48 V rail and anode to ground, clamping positive-going surges. Use Value: 53.3 V clamping ensures protected equipment sees no more than -48 V + 53.3 V = +5.3 V excursion - within safe tolerance of telecom ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/61 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC/PPPM specs, RoHS-compliant but not automotive-qualified | Lacks AEC-Q101 validation; suitable for consumer/industrial, not safety-critical automotive designs | Select when automotive qualification is unnecessary and cost optimization is prioritized |
| SMBJ33AHE3_A/H | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider, higher thermal mass, RθJA = 80 °C/W vs. 120 °C/W | Better power dissipation margin in high-ambient environments; requires larger PCB footprint | Choose when thermal performance outweighs board space constraints, especially above 75 °C ambient |
Compared with SMAJ33AHE3_A/H, SMAJ33A-E3/61 offers identical protection performance at lower cost but excludes automotive reliability validation, while SMBJ33AHE3_A/H trades compactness for improved thermal handling - making SMAJ33AHE3_A/H optimal for space-constrained AEC-Q101 designs requiring DO-214AC footprint compliance.
Availability
SMAJ33AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom DC feeder line hardening requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101 sourcing.
Supply support for SMAJ33AHE3_A/H 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 protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure - engineered for fast response, low clamping, and robust MSL-1 manufacturability in surface-mount systems.
FAQ
What is the clamping voltage of SMAJ33AHE3_A/H at its rated peak pulse current?
The SMAJ33AHE3_A/H has a maximum clamping voltage (VC) of 53.3 V at 7.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on the protected circuit during surge events. The clamping ratio (VC/VBR) is approximately 1.39, confirming strong voltage-limiting capability for 33 V system rails.
Is SMAJ33AHE3_A/H suitable for automotive applications?
Yes, SMAJ33AHE3_A/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC standards. This makes SMAJ33AHE3_A/H appropriate for under-hood and chassis-mounted automotive modules where reliability under thermal and electrical stress is mandatory.
What does the "_A/H" suffix in SMAJ33AHE3_A/H indicate?
The "_A/H" suffix denotes the packaging configuration: "A" specifies the 7-inch plastic tape-and-reel format, and "H" is the preferred package code for that reel size per Vishay's ordering table. The "HE3" portion confirms RoHS-compliance and AEC-Q101 qualification. This full suffix ensures correct identification of the qualified, reel-packaged variant intended for automated SMT assembly.
How does SMAJ33AHE3_A/H compare to bidirectional TVS diodes like SMAJ33CA?
SMAJ33AHE3_A/H is unidirectional and features polarity marking (cathode band), enabling asymmetric protection where only positive transients threaten the rail - e.g., 33 V supply lines. In contrast, SMAJ33CA provides symmetrical clamping for AC-coupled or floating lines. SMAJ33AHE3_A/H offers lower leakage (1.0 μA vs. 2.0 μA for SMAJ33CA) and is optimized for DC rail protection, whereas SMAJ33CA suits data lines or differential buses.
What PCB pad layout is recommended for optimal thermal performance of SMAJ33AHE3_A/H?
Vishay specifies mounting SMAJ33AHE3_A/H on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power. Smaller pads increase thermal resistance beyond the specified 120 °C/W RθJA, reducing surge capability. For sustained reliability, use internal thermal vias under pads and connect to inner-layer ground planes - especially critical in automotive applications exceeding 85 °C ambient.
SMAJ33AHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33AHE3_A/H FAQ
1.How can I place an order for SMAJ33AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AHE3_A/H 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 SMAJ33AHE3_A/H reliable?
The price and inventory of SMAJ33AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ33AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AHE3_A/H?
SMAJ33AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AHE3_A/H 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 SMAJ33AHE3_A/H?
For technical support, including SMAJ33AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ33AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ33AHE3_A/H 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 SMAJ33AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ33AHE3_A/H?
All SMAJ33AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AHE3_A/H, 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 SMAJ33AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ33AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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