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Vishay General Semiconductor - Diodes Division SMAJ33CAHE3/5A
- Part No.:
- SMAJ33CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHE3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,388
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Product details
Overview
SMAJ33CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown range (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 (10/1000 μs waveform). It is widely deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ33CAHE3/5A datasheet, SMAJ33CAHE3/5A pinout, SMAJ33CAHE3/5A application, or SMAJ33CAHE3/5A equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, SMA (DO-214AC) package thermal performance, and compliance with UL 497B surge protector classification.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical clamping behavior above ±33 V. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance enables rapid energy diversion during transients.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C 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 - Confirmed breakdown threshold range under standardized test conditions |
| VC @ IPPM | 53.3 V at 7.5 A - Clamped voltage during 10/1000 μs surge, defining worst-case downstream voltage stress |
| PPPM | 400 W - Peak transient power handling capability with 0.01% duty cycle (≤300 W above 78 V) |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), applicable only to unidirectional variants; not applicable here due to bidirectional construction |
| TJ max. | 150 °C - Maximum allowable junction temperature, enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch, optimized for automated placement and board-level ESD/surge immunity |
Pinout & Package
Package: SMA (DO-214AC) - Two-terminal, symmetrical surface-mount package with matte tin-plated leads; no polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts in either direction once VWM is exceeded - no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and industrial surge protectors |
| Low-profile SMA package | Height ≤ 2.29 mm enables use in space-constrained PCB layouts without compromising thermal dissipation |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly laid out |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching MCU or signal conditioner. Use Value: Maintains signal integrity by limiting voltage excursions to ≤53.3 V during 7.5 A surges, preserving ADC input range and preventing latch-up in microcontrollers. |
Use Scenario: Safeguarding digital input modules against induced surges from relay coil switching and motor drive noise in factory automation systems. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on 24 V DC input channels, coordinated with series impedance for IEC 61000-4-4/5 compliance. Use Value: Enables reliable operation across extended temperature ranges (−55 °C to +150 °C) while meeting industrial surge immunity standards without derating. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Secondary-side protection on Ethernet PHY or RS-485 transceiver lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamping device placed adjacent to transceiver pins to minimize trace inductance impact. Use Value: Symmetrical clamping ensures equal protection for differential signals without polarity dependency, reducing BOM complexity. |
Use Scenario: Output rail protection in AC/DC adapters for USB-C PD and smart home devices subject to plug-in surges. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 5 V/9 V/12 V outputs to prevent damage to connected peripherals during hot-plug events. Use Value: UL 497B recognition confirms suitability for end-product safety certification, reducing time-to-market for Class II power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated | Choose SMAJ33CA-M3/5A when environmental compliance requires halogen-free packaging |
| SMAJ33AHE3/5A | Unidirectional version; includes cathode band marking and forward voltage drop (~3.5 V at 25 A) | Not suitable for AC or bidirectional signal lines; requires polarity-aware layout | Select SMAJ33AHE3/5A only for DC rails where polarity is fixed and forward conduction must be blocked |
Compared with SMAJ33CAHE3/5A, the SMAJ33CA-M3/5A offers identical protection performance with halogen-free construction, while SMAJ33AHE3/5A trades bidirectional symmetry for unidirectional blocking-requiring careful signal polarity validation and eliminating use in AC-coupled or differential interfaces.
Availability
SMAJ33CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ33CAHE3/5A 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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and UL recognition are mandatory.
FAQ
What does the "CA" suffix indicate in SMAJ33CAHE3/5A?
The "CA" suffix denotes a bidirectional configuration: SMAJ33CAHE3/5A provides symmetrical clamping in both polarities, with identical breakdown and clamping characteristics above ±33 V. Unlike unidirectional variants (e.g., SMAJ33AHE3/5A), it has no cathode marking and is used where signal polarity is undefined or alternating, such as on differential bus lines or AC-coupled interfaces.
Is SMAJ33CAHE3/5A qualified for automotive applications?
Yes, SMAJ33CAHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's ordering code HE3 designation. This qualification validates its reliability for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces under temperature cycling, humidity, and mechanical shock stress conditions defined in the AEC standard.
What is the maximum clamping voltage of SMAJ33CAHE3/5A under surge conditions?
The maximum clamping voltage (VC) of SMAJ33CAHE3/5A is 53.3 V at 7.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is measured per ANSI/IEEE C62.35 guidelines.
Does SMAJ33CAHE3/5A meet any safety certifications?
Yes, SMAJ33CAHE3/5A is UL Recognized under file E136766 and classified per UL 497B for surge protective devices. This certification covers both unidirectional and bidirectional configurations and supports end-product safety approvals in telecom, industrial, and consumer applications requiring third-party verification of transient suppression performance.
What is the thermal resistance of SMAJ33CAHE3/5A in standard mounting conditions?
SMAJ33CAHE3/5A 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 standard FR-4 PCB layout and is critical for calculating steady-state power dissipation limits and verifying safe operation at elevated ambient temperatures.
SMAJ33CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMAJ33CAHE3/5A FAQ
1.How can I place an order for SMAJ33CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHE3/5A 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 SMAJ33CAHE3/5A reliable?
The price and inventory of SMAJ33CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHE3/5A?
SMAJ33CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHE3/5A 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 SMAJ33CAHE3/5A?
For technical support, including SMAJ33CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ33CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHE3/5A 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 SMAJ33CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHE3/5A?
All SMAJ33CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHE3/5A, 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 SMAJ33CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ33CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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