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Vishay General Semiconductor - Diodes Division SMAJ33CAHE3/61
- Part No.:
- SMAJ33CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAHE3/61.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,926
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Product details
Overview
SMAJ33CAHE3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff 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 - deployed on signal lines, power rails, and I/O interfaces in automotive ECUs and industrial sensor modules.
For engineers reviewing the SMAJ33CAHE3/61 datasheet, SMAJ33CAHE3/61 pinout, SMAJ33CAHE3/61 application, or SMAJ33CAHE3/61 equivalent, this device delivers AEC-Q101 qualified surge immunity, low incremental surge resistance, and fast sub-nanosecond response time - critical for protecting CAN transceivers, microcontroller GPIOs, and RS-485 bus lines against ESD, lightning-induced transients, and inductive switching spikes.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance under repetitive surge conditions.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to +150 °C junction temperature. The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 3.3 V/5 V/24 V rail protection. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 53.3 V at 7.5 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 compliance. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); validates robustness against motor-switching transients. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design; compatible with automated SMT assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional configuration - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge path | No polarity marking; either terminal serves as input/output for transient energy absorption in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping - critical for safeguarding 3.3 V logic and 5 V analog front-ends. |
| MSL Level 1 moisture sensitivity | Enables standard reflow soldering without baking; supports high-yield manufacturing for volume automotive production. |
| Glass passivated junction | Ensures stable leakage current (<1.0 μA at 33 V) and long-term parameter stability across 15-year service life. |
Applications
| Automotive CAN Bus Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting CAN_H/CAN_L differential pair in vehicle body control modules against load dump and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt transients before reaching CAN transceiver. Use Value: Maintains signal integrity below 53.3 V clamping level while surviving >100,000 surge cycles per AEC-Q101 stress profile. |
Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog I/O modules from field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to limit common-mode overvoltage during ground potential shifts. Use Value: Prevents op-amp saturation and ADC latch-up with <1 ns response time and <1.0 μA leakage at 33 V standby. |
| Consumer Power Adapter Input Stage | Telecom Ethernet PHY Port Protection |
|
Use Scenario: Secondary-side DC output protection in USB-C PD adapters against reverse polarity and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamp between VOUT and GND to absorb back-EMF from disconnected loads. Use Value: Enables compact layout with SMA footprint and eliminates need for series fuse due to 40 A IFSM surge tolerance. |
Use Scenario: Common-mode transient suppression on RJ45 magnetics secondary side in PoE-powered switches. IC Role / Device Role / Timing Role: Symmetrical TVS across transformer center taps to clamp mode-conversion surges entering PHY IC. Use Value: Supports IEEE 802.3af/at compliance with 400 W pulse rating and no derating up to +85 °C ambient. |
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 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No difference in circuit function or layout; selected when halogen-free material compliance is mandated. | Choose SMAJ33CA-M3/61 for green manufacturing programs requiring halogen-free bill-of-materials. |
| SMBJ33CAHE3/61 | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 29% larger footprint and 20% higher PPPM (600 W). | Higher power handling suits higher-energy surge environments (e.g., 24 V industrial motor drives), but requires PCB redesign. | Choose SMBJ33CAHE3/61 only when system-level surge testing exceeds 400 W requirements and board space permits larger package. |
Compared with SMAJ33CA-M3/61, the SMAJ33CAHE3/61 offers identical surge performance with standard RoHS compliance; versus SMBJ33CAHE3/61, it trades 200 W pulse headroom for 30% smaller PCB area and compatibility with dense automotive module layouts.
Availability
SMAJ33CAHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power-over-Ethernet systems requiring stable component supply with full AEC-Q101 traceability and extended lifecycle support.
Supply support for SMAJ33CAHE3/61 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMAJ series targets cost-effective, high-volume transient protection in space-constrained applications - engineered for drop-in replacement of legacy TVS families while meeting stringent automotive qualification standards.
FAQ
What is the clamping voltage of SMAJ33CAHE3/61 at its rated peak pulse current?
The SMAJ33CAHE3/61 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 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ33CAHE3/61 maintains this clamping performance consistently across its operational temperature range and lifetime.
Is SMAJ33CAHE3/61 suitable for automotive applications?
Yes, SMAJ33CAHE3/61 is AEC-Q101 qualified and specifically designed for automotive use - validated for temperature cycling, highly accelerated life testing, and surge endurance. Its bidirectional architecture, 150 °C junction rating, and MSL Level 1 reflow compatibility make it appropriate for engine control units, infotainment systems, and ADAS sensor interfaces. The SMAJ33CAHE3/61 meets OEM requirements for under-hood and cabin-mounted electronics.
How does the bidirectional configuration of SMAJ33CAHE3/61 affect its circuit implementation?
The SMAJ33CAHE3/61 has no polarity marking and functions identically in both directions - simplifying PCB layout by eliminating cathode/anode orientation constraints. It is installed directly across protected nodes (e.g., power-to-ground or differential signal pair), where it conducts during overvoltage in either polarity. This symmetry makes the SMAJ33CAHE3/61 ideal for AC-coupled lines, transformer-isolated interfaces, and floating sensor outputs where voltage reversal is possible.
What is the maximum steady-state power dissipation for SMAJ33CAHE3/61?
The SMAJ33CAHE3/61 has a maximum steady-state power dissipation (PD) of 3.3 W at 50 °C ambient temperature with infinite heatsink conditions. In typical surface-mount applications using 0.2" × 0.2" copper pads per terminal, derating applies above 25 °C ambient per the datasheet curve. This PD rating governs continuous leakage-based heating and is distinct from its 400 W transient pulse capability. The SMAJ33CAHE3/61 remains within safe thermal limits under normal operation with <1.0 μA leakage at 33 V.
Does SMAJ33CAHE3/61 require additional series impedance for optimal protection?
No, SMAJ33CAHE3/61 is designed for direct parallel connection across protected nodes and does not require external series impedance to function. However, in high-speed data lines (e.g., USB, CAN), a small series resistor (e.g., 1–10 Ω) may be added to dampen ringing caused by parasitic inductance - this does not alter the SMAJ33CAHE3/61's clamping behavior but improves signal integrity. The SMAJ33CAHE3/61 itself provides sub-nanosecond response without external components.
SMAJ33CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ33CAHE3/61 FAQ
1.How can I place an order for SMAJ33CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAHE3/61 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 SMAJ33CAHE3/61 reliable?
The price and inventory of SMAJ33CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ33CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAHE3/61?
SMAJ33CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAHE3/61 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 SMAJ33CAHE3/61?
For technical support, including SMAJ33CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ33CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAHE3/61 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 SMAJ33CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ33CAHE3/61?
All SMAJ33CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAHE3/61, 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 SMAJ33CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ33CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAHE3/61 Tags
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