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Vishay General Semiconductor - Diodes Division SMAJ33A-E3/61
- Part No.:
- SMAJ33A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33A-E3/61.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:1,861
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Product details
Overview
SMAJ33A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤53.3 V at 7.5 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and sensor interface circuits.
For engineers reviewing the SMAJ33A-E3/61 datasheet, SMAJ33A-E3/61 pinout, SMAJ33A-E3/61 application, or SMAJ33A-E3/61 equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), 1.0 μA max reverse leakage at VWM, SMA (DO-214AC) package compatibility with automated SMT assembly, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This unidirectional TVS operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse standoff threshold. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges per IEC 61000-4-2/4-5.
The device is rated for 40 A non-repetitive forward surge current (IFSM) and operates across –55 °C to +150 °C junction temperature range. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting reliable operation in thermally constrained PCB layouts without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 3.3 V/5 V/12 V/24 V systems. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown window ensures predictable turn-on with <10% tolerance; critical for precise overvoltage threshold setting. |
| VC @ IPPM | 53.3 V at 7.5 A - Clamping voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust protection against 1 kV/500 A lightning surges per IEC 61000-4-5 Level 3. |
| IR @ VWM | 1.0 μA max - Ultra-low reverse leakage preserves battery life and avoids false triggering in high-impedance sensor bias networks. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with 0.208" x 0.157" footprint; compatible with JEDEC MS-013AC and automated pick-and-place. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures without derating below full power. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), RoHS-compliant (E3 suffix). Polarity indicated by cathode band; anode and cathode terminals are axially oriented along the body axis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground during overvoltage events - must route with low-inductance path to chassis or power plane. |
| Anode | Reference/return node | Typically tied to system ground or common return; forms clamping loop with cathode - requires minimal trace length to avoid voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against severe industrial and automotive transients without external series impedance. |
| Fast response time (<1 ns) | Clamps voltage spikes before sensitive logic or analog circuitry sustains damage - essential for protecting high-speed interfaces. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage across temperature and lifetime; eliminates parameter drift in harsh environments. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during high-di/dt events - improves margin for 3.3 V and 5 V logic-level components. |
| AEC-Q101 qualification option | HE3 suffix variants meet automotive reliability requirements for engine control, ADAS sensors, and infotainment power rails. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 12 V supply rail and LIN bus lines from load dump and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤53.3 V, safeguarding 3.3 V microcontroller I/O and LIN transceiver inputs without requiring additional filtering. |
Use Scenario: Shielding 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each optocoupler input path, absorbing up to 400 W of surge energy per event. Use Value: Prevents false triggering and latch-up in isolation circuitry while maintaining <1 μA leakage to preserve input sensitivity. |
| Consumer Smart Appliance Motor Drive | Telecom Remote Sensor Node |
|
Use Scenario: Guarding MCU GPIOs and motor driver enable lines against back-EMF spikes from brushed DC motors in washing machines. IC Role / Device Role / Timing Role: Localized TVS adjacent to motor driver IC outputs, providing sub-ns response to commutation transients. Use Value: Clamps 7.5 A surges to 53.3 V, eliminating need for RC snubbers and reducing BOM count in cost-sensitive white goods designs. |
Use Scenario: Securing RS-485 data lines and 3.3 V power rail in battery-powered environmental monitoring nodes exposed to outdoor lightning coupling. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (with optional CA variant) used in conjunction with common-mode chokes. Use Value: Delivers 400 W surge immunity in compact SMA package, extending field unit MTBF without increasing enclosure size or cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and thermal performance. | No functional difference; selected when halogen-free compliance is mandated by OEM or regional regulations. | Choose M3/61 for green manufacturing programs where brominated flame retardants are prohibited. |
| SMAJ33CA-E3/61 | Bidirectional version with same VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V), but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where polarity reversal may occur. | Select SMAJ33CA-E3/61 only when bidirectional protection is needed; unidirectional SMAJ33A-E3/61 is optimal for DC rails. |
Compared with SMAJ33A-M3/61, the E3/61 offers standard RoHS compliance without halogen-free constraints; versus SMAJ33CA-E3/61, the unidirectional version provides lower leakage and tighter VBR tolerance for DC-biased applications - making SMAJ33A-E3/61 the preferred choice for 33 V power rail protection.
Availability
SMAJ33A-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and consumer appliance power management systems requiring stable component supply and consistent surge immunity performance.
Supply support for SMAJ33A-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in space-constrained, high-reliability applications - targeting automotive, industrial, and telecom markets where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMAJ33A-E3/61 under a 10/1000 μs surge?
The SMAJ33A-E3/61 clamps to a maximum of 53.3 V when subjected to its rated peak pulse current of 7.5 A under the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C with specified mounting conditions (0.2" × 0.2" copper pads), and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ33A-E3/61 suitable for automotive applications?
SMAJ33A-E3/61 itself is commercial-grade, but Vishay offers the AEC-Q101 qualified variant SMAJ33AHE3_A/H with identical electrical characteristics. The SMAJ33A-E3/61 shares the same SMA (DO-214AC) package, thermal profile, and surge performance - making it suitable for non-safety-critical automotive subsystems like infotainment power rails or body electronics when validated per customer requirements.
How does the leakage current of SMAJ33A-E3/61 affect low-power sensor circuits?
SMAJ33A-E3/61 exhibits a maximum reverse leakage current of 1.0 μA at its 33 V standoff voltage (VWM), measured at 25 °C. This ultra-low leakage ensures minimal impact on battery-operated sensor nodes or high-impedance analog front-ends, preserving signal integrity and extending operational lifetime without introducing measurable offset or loading error in precision measurement paths.
What is the thermal resistance of SMAJ33A-E3/61, and how does it influence PCB layout?
The SMAJ33A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes standard JEDEC test conditions; reducing pad area or omitting thermal vias increases RθJA, potentially limiting sustained power dissipation. For high-duty-cycle surge environments, designers should maximize copper area and add thermal vias to maintain TJ ≤ 150 °C.
Can SMAJ33A-E3/61 be used in place of SMAJ33CA-E3/61?
No - SMAJ33A-E3/61 is unidirectional and intended for DC-biased lines with defined polarity, whereas SMAJ33CA-E3/61 is bidirectional and required for AC-coupled or polarity-agnostic signals like RS-485 or CAN. Substituting SMAJ33A-E3/61 in bidirectional applications risks failure during negative transients, as it will not clamp in the forward direction. Always match device polarity to circuit topology.
SMAJ33A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ33A-E3/61 FAQ
1.How can I place an order for SMAJ33A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33A-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 SMAJ33A-E3/61 reliable?
The price and inventory of SMAJ33A-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 SMAJ33A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ33A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33A-E3/61?
SMAJ33A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33A-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 SMAJ33A-E3/61?
For technical support, including SMAJ33A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33A-E3/61 requirements.
6.How does Aetrix verify that SMAJ33A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ33A-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 SMAJ33A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ33A-E3/61?
All SMAJ33A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33A-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 SMAJ33A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ33A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33A-E3/61 Tags
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