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Vishay General Semiconductor - Diodes Division SMAJ33CA-E3/61
- Part No.:
- SMAJ33CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CA-E3/61.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:156,779
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Product details
Overview
SMAJ33CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on power and signal lines. It features a 33 V standoff voltage (VWM), 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 - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the SMAJ33CA-E3/61 datasheet, SMAJ33CA-E3/61 pinout, SMAJ33CA-E3/61 application, or SMAJ33CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, AEC-Q101 qualification eligibility (via HE3 suffix variants), UL 497B recognition, and compatibility with automated SMT placement on DO-214AC footprint.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical reverse/forward characteristics due to its bidirectional construction. It responds in <1 ps to transient overvoltages and maintains stable clamping performance across -55 °C to +150 °C junction temperature range.
Designed for unclamped inductive switching events and lightning-induced surges, SMAJ33CA-E3/61 delivers repeatable 400 W pulse handling (derated to 300 W above 78 V) on standard 0.2" × 0.2" copper pads, with thermal resistance RθJA = 120 °C/W enabling reliable operation without heatsinking in most board-level applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Confirmed avalanche onset range ensuring predictable turn-on margin |
| VC (Clamping Voltage) | 53.3 V at 7.5 A IPPM - Limits downstream circuit voltage during 10/1000 μs surge, protecting 3.3 V/5 V logic rails |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Withstands typical ESD and lightning surge energy per IEC 61000-4-5 Level 4 |
| IPPM (Peak Pulse Current) | 7.5 A - Sustains defined surge current without degradation when mounted per recommended pad layout |
| TJmax | +150 °C - Enables use in under-hood automotive and high-temperature industrial environments |
| RθJA | 120 °C/W - Allows thermal design without forced airflow or heatsinks on standard FR-4 PCBs |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; symmetric conduction path enables dual-polarity protection |
| Cathode | Transient current entry (bidirectional) | Identical electrical role to Anode; no functional distinction in CA-type devices - both terminals serve as interchangeable surge paths |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and floating sensor inputs without polarity concerns |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and automotive end equipment |
| UL 497B recognized (QVGQ2) | Validated for telecom and data line protection systems requiring safety agency approval |
| AEC-Q101 qualification option | HE3/HM3 variants support automotive-grade reliability testing including temperature cycling and HTRB |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity limitations |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage clamping element placed directly at connector interface to shunt transients before reaching sensitive ICs. Use Value: Maintains 33 V standoff while clamping to ≤53.3 V, preserving signal integrity for 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring surges and ground loop transients. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC input channels, positioned upstream of optocouplers and level shifters. Use Value: Absorbs 400 W surge energy without failure, preventing latch-up or permanent damage to isolation components. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHYs and PoE injectors from induced lightning surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional clamp on differential pairs (e.g., MDI-X lines), coordinated with common-mode chokes. Use Value: Symmetric clamping ensures equal protection on both conductors, meeting GR-1089-CORE telecom surge standards. |
Use Scenario: Secondary-side overvoltage suppression on 5 V/12 V USB-C and wall adapter outputs exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Final-stage TVS between regulator output and connector, limiting fast-rising spikes before reaching connected devices. Use Value: Sub-1 ps response time prevents overshoot beyond 53.3 V, safeguarding USB PD controllers and Type-C port logic. |
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-E3/61 | Unidirectional variant with cathode band marking; identical VWM, VC, and PPPM, but asymmetric conduction | Required only where DC-biased lines need polarity-specific clamping (e.g., 12 V supply rail) | Select SMAJ33A-E3/61 when protecting unidirectional power rails; SMAJ33CA-E3/61 remains preferred for AC, differential, or floating signals |
| SMCJ33CA-E3/61 | Same VWM and VC, but higher 1500 W PPPM rating and larger SMC (DO-214AB) package | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets, motor drives) | Choose SMCJ33CA-E3/61 when system-level surge tests exceed IEC 61000-4-5 Level 4; SMAJ33CA-E3/61 fits space-constrained layouts |
Compared with SMAJ33A-E3/61, SMAJ33CA-E3/61 provides polarity-agnostic protection critical for differential signaling, while SMCJ33CA-E3/61 trades compactness for higher surge robustness - making SMAJ33CA-E3/61 optimal for cost-sensitive, space-limited bidirectional protection.
Availability
SMAJ33CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter outputs requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMAJ33CA-E3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets board-level transient protection in automotive, industrial, and communications systems, delivering standardized TVS performance in compact surface-mount packages for high-volume automated assembly.
FAQ
What is the clamping voltage of SMAJ33CA-E3/61 at its rated peak pulse current?
The SMAJ33CA-E3/61 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 under standardized test conditions per JEDEC and IEC 61000-4-5, ensuring consistent overvoltage limiting behavior across production lots. The SMAJ33CA-E3/61 achieves this clamping performance while maintaining low incremental surge resistance for minimal voltage overshoot.
Is SMAJ33CA-E3/61 suitable for automotive applications?
SMAJ33CA-E3/61 itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3/HM3 suffixes (e.g., SMAJ33CAHE3_A). The SMAJ33CA-E3/61 shares identical electrical specs and DO-214AC packaging with those qualified variants, enabling direct drop-in qualification path. Its -55 °C to +150 °C operating range and UL 497B recognition further support automotive deployment in non-safety-critical modules like body control units and infotainment interfaces.
How does SMAJ33CA-E3/61 differ from unidirectional SMAJ33A-E3/61?
SMAJ33CA-E3/61 is bidirectional with symmetrical avalanche characteristics in both directions and no polarity marking, whereas SMAJ33A-E3/61 is unidirectional with a cathode band and conducts only in reverse bias. Both share identical VWM (33 V), VC (53.3 V), and PPPM (400 W), but SMAJ33CA-E3/61 supports AC-coupled, differential, or floating signal lines - such as RS-485 buses or sensor bridges - where polarity cannot be assumed.
What is the thermal resistance of SMAJ33CA-E3/61, and how does it affect PCB layout?
SMAJ33CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes; adding thermal vias or increasing copper area reduces effective RθJA. For continuous power dissipation near its 3.3 W rating, layout must ensure adequate copper pour - but for transient-only operation (typical use case), no additional thermal design is required.
Does SMAJ33CA-E3/61 meet any safety certifications?
Yes, SMAJ33CA-E3/61 is Underwriters Laboratory (UL) recognized under file E136766 for both unidirectional and bidirectional devices, complying with UL 497B for primary protectors in telecommunications circuits. It also meets MSL Level 1 per J-STD-020 (peak reflow temperature 260 °C) and is RoHS-compliant (E3 suffix), supporting safety-critical and environmentally regulated designs without derating or special handling.
SMAJ33CA-E3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33CA-E3/61 FAQ
1.How can I place an order for SMAJ33CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CA-E3/61 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 SMAJ33CA-E3/61 reliable?
The price and inventory of SMAJ33CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ33CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CA-E3/61?
SMAJ33CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CA-E3/61 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 SMAJ33CA-E3/61?
For technical support, including SMAJ33CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ33CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ33CA-E3/61 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 SMAJ33CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ33CA-E3/61?
All SMAJ33CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CA-E3/61, 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 SMAJ33CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ33CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CA-E3/61 Tags
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