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Vishay General Semiconductor - Diodes Division SMAJ33CAHE3_A/H
- Part No.:
- SMAJ33CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHE3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,606
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Product details
Overview
SMAJ33CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ33CAHE3_A/H datasheet, SMAJ33CAHE3_A/H pinout, SMAJ33CAHE3_A/H application, or SMAJ33CAHE3_A/H equivalent, key selection criteria include bidirectional surge protection capability, AEC-Q101 qualification for automotive use, low clamping ratio (VC/VWM ≈ 1.61), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but switches to low-impedance conduction within picoseconds when transient voltage exceeds its breakdown threshold (min. 36.7 V, max. 40.6 V at 1 mA). Its bidirectional symmetry enables protection of AC-coupled or floating lines without polarity constraints.
The SMAJ33CAHE3_A/H uses a glass-passivated silicon junction, supports repetitive surge events at 0.01% duty cycle, and is rated for operation from –55 °C to +150 °C junction temperature. Its thermal resistance (RθJA = 120 °C/W) and 3.3 W steady-state power dissipation are defined for mounting on 0.2" × 0.2" copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 36.7 V to 40.6 V at 1 mA - Confirmed voltage range where device transitions from high- to low-impedance state. |
| VC (Clamping Voltage) | 53.3 V at IPPM = 7.5 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy handling capacity with standard 10/1000 μs waveform; derates above 78 V to 300 W. |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Ensures minimal loading on sensitive signal lines during normal operation. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive or industrial environments with high ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Polarity marking: none (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity dependency-enables placement on AC or differential lines without orientation check. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of floating, AC-coupled, or differential signal paths without polarity-sensitive layout constraints. |
| 400 W peak pulse power (10/1000 μs) | Handles typical ESD and load-dump surges in automotive and industrial interfaces without degradation. |
| AEC-Q101 qualified (HE3 suffix) | Meets automotive reliability standards for mission-critical electronics including engine control and ADAS subsystems. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or sensor front-ends. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorn failure risk. |
Applications
| Automotive CAN Bus Protection | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L differential pair against ISO 7637-2 load dump and ESD events in vehicle ECUs. IC Role / Device Role: Bidirectional voltage clamp placed across differential bus prior to CAN transceiver input. Use Value: Limits transient voltage to ≤53.3 V while maintaining <1 μA leakage at 33 V nominal bus voltage-preserving signal integrity and transceiver immunity. |
Use Scenario: Shielding analog output (4–20 mA) or digital I²C lines from switching noise and cable-induced surges in factory automation sensors. IC Role / Device Role: Point-of-entry TVS on sensor module PCB, mounted directly at connector interface. Use Value: Clamps 400 W transients within nanoseconds, preventing latch-up or damage to precision ADCs or microcontroller GPIOs. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Safeguarding Ethernet PHY or DSL line drivers from lightning-induced surges on outdoor-facing telecom equipment. IC Role / Device Role: Primary surge suppression stage before secondary filtering and isolation components. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W and maintains stable VBR over temperature (0.1 %/°C coefficient). |
Use Scenario: Adding robust ESD immunity to USB 2.0 data lines (D+/D−) in portable devices exposed to human-body-model discharges. IC Role / Device Role: Low-capacitance bidirectional TVS placed adjacent to USB connector pins. Use Value: Delivers sub-100 pF junction capacitance (typ.) and 53.3 V clamping-preventing data corruption while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-M3/61 | Same electrical specs, halogen-free RoHS-compliant variant; no AEC-Q101 qualification. | Preferred for commercial/industrial designs where automotive qualification is not required. | Select when halogen-free compliance is mandatory and automotive reliability testing is unnecessary. |
| SMBJ33CAHE3_A/H | Same VWM/VC ratings but in larger SMB (DO-214AA) package; higher PPPM (600 W) and lower RθJA (80 °C/W). | Better suited for high-energy surge environments or thermally constrained layouts requiring enhanced power handling. | Choose when board space allows larger footprint and system-level surge tests exceed 400 W requirements. |
Compared with SMAJ33CAHE3_A/H, SMAJ33CA-M3/61 offers identical protection performance without automotive qualification, while SMBJ33CAHE3_A/H provides higher surge margin and improved thermal performance at the cost of increased PCB area.
Availability
SMAJ33CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom line interfaces, and consumer USB port protection requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ33CAHE3_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 and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where fast response, low clamping, and long-term stability are critical.
FAQ
What is the clamping voltage of SMAJ33CAHE3_A/H at its rated peak pulse current?
The SMAJ33CAHE3_A/H has a maximum clamping voltage (VC) of 53.3 V when subjected to its specified peak pulse current (IPPM) of 7.5 A using the 10/1000 μs waveform. This value is measured per JEDEC standards and ensures predictable overvoltage limiting for downstream circuitry during surge events.
Is SMAJ33CAHE3_A/H suitable for automotive applications?
Yes, SMAJ33CAHE3_A/H is AEC-Q101 qualified, making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. Its qualification covers temperature cycling, mechanical shock, and humidity bias testing required for under-hood and cabin-mounted systems.
How does the bidirectional design of SMAJ33CAHE3_A/H affect PCB layout?
The bidirectional design of SMAJ33CAHE3_A/H eliminates polarity constraints-no cathode band marking is present, and either terminal may connect to either side of a differential or AC-coupled line. This simplifies layout, reduces assembly errors, and supports symmetric placement across signal pairs like CAN or RS-485.
What is the thermal resistance of SMAJ33CAHE3_A/H, and how does it impact power handling?
SMAJ33CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. This value determines steady-state temperature rise under DC bias; for example, at 3.3 W dissipation, junction temperature rises ~396 °C above ambient-hence it is rated for pulsed operation, not continuous power.
Does SMAJ33CAHE3_A/H meet RoHS and REACH compliance requirements?
Yes, SMAJ33CAHE3_A/H is RoHS-compliant per EU Directive 2011/65/EU and meets Vishay's material compliance standards as defined in document 99912. The HE3 suffix explicitly denotes RoHS-compliant construction with AEC-Q101 qualification, and no restricted substances exceed allowable thresholds.
SMAJ33CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ33CAHE3_A/H FAQ
1.How can I place an order for SMAJ33CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHE3_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 SMAJ33CAHE3_A/H reliable?
The price and inventory of SMAJ33CAHE3_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 SMAJ33CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHE3_A/H?
SMAJ33CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHE3_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 SMAJ33CAHE3_A/H?
For technical support, including SMAJ33CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHE3_A/H requirements.
6.How does Aetrix verify that SMAJ33CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHE3_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 SMAJ33CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHE3_A/H?
All SMAJ33CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHE3_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 SMAJ33CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ33CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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