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Vishay General Semiconductor - Diodes Division SMAJ33-E3/63
- Part No.:
- SMAJ33-E3/63
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33-E3/63.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,877
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Product details
Overview
SMAJ33-E3/63 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 33 V stand-off voltage (VWM), 59.0 V maximum clamping voltage (VC) at 6.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ33-E3/63 datasheet, SMAJ33-E3/63 pinout, SMAJ33-E3/63 application, or SMAJ33-E3/63 equivalent, this device delivers verified transient suppression performance for 24–36 V DC systems, meets RoHS compliance and J-STD-020 MSL Level 1, and supports automated SMT placement with matte tin-plated leads solderable per J-STD-002.
Technical Context
This unidirectional TVS operates by avalanche breakdown above its 36.7–44.9 V breakdown voltage (VBR at 1 mA), maintaining low dynamic impedance to clamp fast transients within nanoseconds. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and robust surge handling up to 40 A IFSM (8.3 ms half-sine).
Thermal design is supported by RθJA = 120 °C/W (on 5.0 × 5.0 mm copper pads) and TJmax = +150 °C, enabling reliable operation in ambient temperatures from –55 °C to +150 °C. The device complies with ANSI/IEEE C62.35 surge standards and is rated for repetitive 0.01% duty cycle pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 24 V nominal systems. |
| VC @ IPPM | 59.0 V - Clamped voltage during 6.8 A 10/1000 µs surge; limits downstream component stress to sub-60 V level. |
| PPPM | 400 W - Peak pulse power dissipation capability; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V rails. |
| IPPM | 6.8 A - Peak surge current handled at VC; derived from 400 W / 59.0 V, confirming energy-handling capacity. |
| IR @ VWM | <1.0 µA - Reverse leakage at 33 V; ensures negligible standby power loss and no interference with high-impedance sensing nodes. |
| TJmax | +150 °C - Maximum junction temperature; enables use in under-hood automotive or enclosed industrial enclosures. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with IPC-7351B footprint. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two coplanar terminals, cathode indicated by a visible band on one end. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes avalanche path during positive transients on cathode side. |
| Cathode (banded end) | High-side transient input terminal | Connected to protected line (e.g., 24 V rail or signal trace); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 1 kV on 24 V systems without derating. |
| Low clamping ratio (VC/VWM = 1.79) | Minimizes overvoltage exposure to downstream components - critical for 3.3 V or 5 V logic powered from protected rails. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime, even in humid environments. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU Directive 2002/95/EC; suitable for consumer, industrial, and telecom equipment without automotive qualification overhead. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from inductive kickback and ESD events during field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground, clamping transients before they reach optocoupler or MCU GPIO. Use Value: Limits voltage excursion to ≤59.0 V during 6.8 A surges, preserving isolation barrier integrity and preventing false triggering of input latching circuits. |
Use Scenario: Safeguarding 24 V supply rail feeding microcontrollers and CAN transceivers in body control modules exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary front-end TVS on main power entry, coordinated with upstream fuse and secondary LC filtering. Use Value: Withstands 400 W transient energy without degradation, ensuring system-level ISO 7637-2 Pulse 5a compliance while maintaining <1 µA leakage at 33 V. |
| Telecom Remote Radio Unit (RRU) DC Feed | Consumer Appliance Motor Drive Board |
|
Use Scenario: Protecting 48 V DC power feed lines to remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC input stage, selected for VWM = 33 V to accommodate 48 V nominal with 20 % tolerance and ripple. Use Value: Clamps to 59.0 V within <1 ns, preventing damage to PoE-like DC-DC converters and FET drivers downstream. |
Use Scenario: Shielding gate drivers and current-sense amplifiers on BLDC motor control boards from commutation spikes and ESD during user interface interaction. IC Role / Device Role / Timing Role: Localized TVS on low-voltage auxiliary rails (e.g., 12 V gate drive or 3.3 V sensor supply). Use Value: Low 1.0 µA leakage avoids loading precision current-sense shunts; DO-214AC footprint allows placement adjacent to sensitive analog traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/63 | Lower VBR range (36.7–40.6 V), tighter tolerance; VC = 53.3 V at 7.5 A. | Better suited for 3.3 V or 5 V logic rails where lower clamping voltage is prioritized over higher VWM margin. | Select SMAJ33A-E3/63 when clamping voltage headroom is more critical than standoff voltage margin in low-voltage systems. |
| SMBJ33A-E3/52 | Same VWM/VC specs but in larger DO-214AA (SMB) package; PPPM = 600 W. | Higher power handling enables use in higher-energy surge environments (e.g., industrial mains-connected equipment). | Choose SMBJ33A-E3/52 when board space permits and system-level surge testing requires >400 W capability. |
Compared with SMAJ33-E3/63, the SMAJ33A-E3/63 offers lower clamping but reduced standoff margin, while SMBJ33A-E3/52 trades compactness for higher surge robustness - making SMAJ33-E3/63 the optimal balance of size, 33 V system compatibility, and 400 W protection in space-constrained 24 V designs.
Availability
SMAJ33-E3/63 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ33-E3/63 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting industrial, automotive, and telecom applications where consistent clamping performance and AEC-Q101 readiness (in HE3 variants) are essential.
FAQ
What is the maximum clamping voltage of the SMAJ33-E3/63 under a 10/1000 µs surge?
The SMAJ33-E3/63 has a maximum clamping voltage (VC) of 59.0 V at 6.8 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390, confirming its ability to limit transient overvoltage to under 60 V in 24 V system protection applications. The SMAJ33-E3/63 maintains this clamping performance across its specified operating temperature range.
Is the SMAJ33-E3/63 unidirectional or bidirectional?
The SMAJ33-E3/63 is a unidirectional Transient Voltage Suppressor, as confirmed by its part number suffix (no "C" or "CA") and electrical characteristics table showing distinct anode-cathode polarity. Its cathode is marked by a visible band, and it conducts only when the cathode is driven positive relative to the anode - making it appropriate for DC rail protection where polarity is fixed. The SMAJ33-E3/63 does not conduct in reverse bias below VWM = 33 V.
What is the standoff voltage (VWM) rating for the SMAJ33-E3/63?
The SMAJ33-E3/63 has a standoff voltage (VWM) of 33 V, meaning it remains non-conductive up to this reverse voltage at 25 °C. This rating provides a safe operating margin for 24 V nominal systems with typical tolerances and ripple. The SMAJ33-E3/63 exhibits <1.0 µA leakage current at VWM, ensuring minimal impact on high-impedance monitoring circuits.
Does the SMAJ33-E3/63 meet RoHS and lead-free assembly requirements?
Yes, the SMAJ33-E3/63 is RoHS-compliant per Directive 2002/95/EC and qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C (MSL Level 1 per J-STD-020). Its matte tin-plated leads meet J-STD-002 solderability standards and JESD201 Class 1A whisker resistance. The SMAJ33-E3/63 is designated as commercial-grade (E3 suffix), not automotive (HE3), but fully satisfies environmental and process requirements for modern SMT production.
What package type does the SMAJ33-E3/63 use, and what are its key mechanical features?
The SMAJ33-E3/63 uses the DO-214AC (SMA) surface-mount package, measuring 4.50 mm × 2.79 mm × 2.29 mm with coplanar leads and a cathode band marking. Its molding compound meets UL 94 V-0 flammability rating, and terminals are matte tin-plated for reliable solder joint formation. The SMAJ33-E3/63 is optimized for automated pick-and-place and reflow processes, with thermal resistance RθJA = 120 °C/W when mounted on 5.0 × 5.0 mm copper pads.
SMAJ33-E3/63 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- 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)
SMAJ33-E3/63 FAQ
1.How can I place an order for SMAJ33-E3/63 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33-E3/63 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 SMAJ33-E3/63 reliable?
The price and inventory of SMAJ33-E3/63 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33-E3/63 is usually 5 days.
3.What payment methods are accepted for SMAJ33-E3/63?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33-E3/63 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33-E3/63?
SMAJ33-E3/63 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33-E3/63 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 SMAJ33-E3/63?
For technical support, including SMAJ33-E3/63 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33-E3/63 requirements.
6.How does Aetrix verify that SMAJ33-E3/63 is sourced from the original manufacturer or authorized distributors?
All SMAJ33-E3/63 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 SMAJ33-E3/63 meets industry standards.
7.What is the process for return or replacement of SMAJ33-E3/63?
All SMAJ33-E3/63 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33-E3/63, 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 SMAJ33-E3/63 part is unused and in its original packaging.
Return procedure for SMAJ33-E3/63:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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