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Vishay General Semiconductor - Diodes Division SMAJ33CAHE3_A/I
- Part No.:
- SMAJ33CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHE3_A/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,849
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Product details
Overview
SMAJ33CAHE3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ33CAHE3_A/I datasheet, SMAJ33CAHE3_A/I pinout, SMAJ33CAHE3_A/I application, or SMAJ33CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior due to its CA suffix configuration. Its 36.7–40.6 V breakdown voltage range (VBR at 1 mA) ensures reliable triggering above 33 V standoff while maintaining low leakage (<1 μA at VWM).
Thermally, it sustains operation from –55 °C to +150 °C junction temperature, with RθJA = 120 °C/W enabling use in compact PCB layouts without forced cooling. The glass-passivated junction and matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
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 - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 53.3 V at 7.5 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 400 W - peak surge energy absorption capacity under standard lightning/surge test waveform |
| ID @ VWM | <1 μA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - supports under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with IPC-7351B standard land patterns |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity unmarked for bidirectional operation per JEDEC DO-214AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional clamping | Connected to protected line; forms symmetrical clamp path with cathode during either polarity surge |
| Cathode | Current exit terminal in forward bias; common node in bidirectional clamping | Connected to protected line; enables equal clamping voltage magnitude for positive/negative transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, and HTRB |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when mounted on 5 mm × 5 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass-passivated junction | Ensures stable VBR over time and temperature, critical for long-life industrial deployments |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or supply rail. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding 24 V digital input modules against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor at module connector entry point. Use Value: Absorbs 400 W surge energy without degradation, maintaining system uptime in factory automation environments. |
| Consumer Power Adapter Output Protection | Telecom Ethernet Port Surge Suppression |
Use Scenario: Clamping output rail transients in AC/DC adapters powering USB-C PD or PoE-powered devices. IC Role / Device Role / Timing Role: Secondary-side TVS between VOUT and GND, downstream of DC-DC converter. Use Value: Responds in <1 ps to fast-rising ESD events, preserving compliance with IEC 61000-4-2 Level 4. |
Use Scenario: Protecting RJ45 magnetics and PHY ICs from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Common-mode clamp across transformer center taps or data pairs. Use Value: Withstands repeated 10/1000 μs surges up to 400 W, meeting GR-1089-CORE telecom immunity requirements. |
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 difference in circuit performance or layout; differs only in material composition | Select when halogen-free compliance is mandated by end-equipment environmental policy |
| SMBJ33CAHE3_A/I | Same VWM/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating | Higher surge margin suitable for higher-energy threat environments (e.g., outdoor power supplies) | Choose when board space allows and system-level surge testing exceeds IEC 61000-4-5 Level 4 |
Compared with SMAJ33CAHE3_A/I, the SMAJ33CA-M3/5A offers identical protection performance with halogen-free materials, while the SMBJ33CAHE3_A/I provides 50 % higher surge power handling in a larger footprint - both require no schematic change but may impact layout density or thermal pad design.
Availability
SMAJ33CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer power adapter designs requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ33CAHE3_A/I 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, automotive qualification, and high-volume manufacturability.
The SMAJ series was developed specifically for robust, surface-mount transient suppression in space-constrained automotive and industrial systems where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SMAJ33CAHE3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMAJ33CAHE3_A/I clamps voltage transients of either polarity symmetrically, making it suitable for AC-coupled lines or differential buses like CAN or RS-485. Unlike unidirectional "A" variants, it has no cathode marking and identical VBR/VWM specifications in both directions.
Is SMAJ33CAHE3_A/I qualified for automotive applications?
Yes, SMAJ33CAHE3_A/I is AEC-Q101 qualified - confirmed in Vishay's ordering information table and thermal characteristics notes. This qualification covers high-temperature operating life, temperature cycling, and humidity testing required for under-hood and cabin electronics deployment.
What is the maximum clamping voltage of SMAJ33CAHE3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ33CAHE3_A/I is 53.3 V at 7.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per Figure 1 in the datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
How does the SMA (DO-214AC) package of SMAJ33CAHE3_A/I affect thermal performance?
The SMA package delivers RθJL = 30 °C/W (junction-to-lead) and RθJA = 120 °C/W (junction-to-ambient) when mounted on 0.2" × 0.2" copper pads. This enables reliable operation up to +150 °C junction temperature without heatsinking - critical for dense automotive PCB layouts.
Can SMAJ33CAHE3_A/I replace SMAJ33AHE3_A/I in a design?
No - SMAJ33CAHE3_A/I is bidirectional while SMAJ33AHE3_A/I is unidirectional. Substituting them requires verifying circuit polarity: unidirectional parts require correct cathode orientation and cannot suppress negative transients. Layout changes and schematic review are mandatory before interchange.
SMAJ33CAHE3_A/I 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/I FAQ
1.How can I place an order for SMAJ33CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHE3_A/I 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/I reliable?
The price and inventory of SMAJ33CAHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHE3_A/I?
SMAJ33CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHE3_A/I 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/I?
For technical support, including SMAJ33CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHE3_A/I requirements.
6.How does Aetrix verify that SMAJ33CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHE3_A/I?
All SMAJ33CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMAJ33CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAHE3_A/I Tags
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