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Vishay General Semiconductor - Diodes Division SMAJ33CA-E3/5A
- Part No.:
- SMAJ33CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CA-E3/5A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:24,017
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Product details
Overview
SMAJ33CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 7.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ33CA-E3/5A datasheet, SMAJ33CA-E3/5A pinout, SMAJ33CA-E3/5A application, or SMAJ33CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), AEC-Q101 qualification eligibility (via HE3/HM3 variants), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode optimized for fast transient suppression: it responds in <1 ps to ESD or lightning-induced surges and maintains stable clamping across -55 °C to +150 °C junction temperature range. Its bidirectional symmetry ensures identical breakdown behavior in both polarities, eliminating polarity-sensitive layout constraints.
The SMAJ33CA-E3/5A uses glass-passivated junction construction for robust surge endurance and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (0.2" × 0.2") to sustain repetitive 400 W pulses at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche breakdown window defining turn-on threshold |
| VC @ IPPM | 53.3 V at 7.5 A - clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling with standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature enabling under-hood automotive use |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm length, 4.50 mm width, 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current toward cathode during positive overvoltage events |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current toward anode during negative overvoltage events; symmetric bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions eliminates need for polarity-aware routing |
| 400 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV surge) protection on 24 V industrial buses with margin |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot beyond protected IC's absolute maximum rating |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking, reducing manufacturing overhead |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring reliability validation |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 24 V CAN/LIN bus power rails. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converter input. Use Value: Limits voltage excursion to 53.3 V during 7.5 A surge, preventing damage to 36 V-rated regulators. |
Use Scenario: Guarding analog output lines (e.g., 4–20 mA transmitter) against ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance shunt protector located at connector interface. Use Value: 1.0 μA leakage preserves signal integrity; 53.3 V clamping protects 36 V op-amps without derating. |
| Consumer USB Port ESD Protection | Telecom DSL Line Surge Suppression |
|
Use Scenario: Secondary-level protection on VBUS line of USB 2.0 ports exposed to human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary polymer PTC fuse. Use Value: Sub-nanosecond response clamps 8 kV HBM events to <55 V, within USB 2.0 PHY tolerance. |
Use Scenario: Protecting ADSL/VDSL line drivers from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional shunt clamp bridging tip/ring conductors. Use Value: Symmetric 33 V standoff and 53.3 V clamping match telecom line voltage swing while surviving 10/1000 μs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5A | Unidirectional variant with cathode band marking; same VWM, VBR, VC, and PPPM ratings | Requires polarity-aware PCB layout; suitable where circuit ground reference defines unidirectional surge path | Select when system topology guarantees consistent polarity of transients (e.g., DC power rails with defined ground) |
| SMBJ33CA-T | Same electrical specs but in larger SMB (DO-214AA) package; 100 W higher PPPM (500 W) at 10/1000 μs | Higher thermal mass supports more frequent surge events; requires 25 % larger PCB footprint | Choose for high-duty-cycle environments (e.g., motor drive feedback lines) where 500 W headroom justifies extra board area |
Compared with SMAJ33A-E3/5A, the SMAJ33CA-E3/5A eliminates polarity dependency at identical cost and footprint; versus SMBJ33CA-T, it trades 100 W pulse power for 25 % smaller board area and lower assembly cost in space-constrained designs.
Availability
SMAJ33CA-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom infrastructure requiring stable component supply with RoHS-compliant, commercial-grade assurance.
Supply support for SMAJ33CA-E3/5A 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, and protection devices with emphasis on reliability and automotive-grade qualification.
The SMAJ series targets board-level transient protection in harsh environments, with design focus on fast response, repeatable clamping, and compatibility with high-volume SMT manufacturing.
FAQ
What is the clamping voltage of SMAJ33CA-E3/5A at its rated peak pulse current?
The SMAJ33CA-E3/5A exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its specified peak pulse current of 7.5 A using the 10/1000 μs waveform. This value is measured per JEDEC standards and represents the upper limit of voltage seen by downstream components during surge events - critical for ensuring protected ICs remain within their absolute maximum voltage ratings. The SMAJ33CA-E3/5A achieves this with a clamping ratio of 1.62 relative to its 33 V stand-off voltage.
Is SMAJ33CA-E3/5A suitable for automotive applications?
SMAJ33CA-E3/5A itself is a commercial-grade part (E3 suffix), but Vishay offers AEC-Q101-qualified versions under HE3/HM3 ordering codes (e.g., SMAJ33CAHE3_A/I). These variants undergo stress testing for temperature cycling, humidity, and mechanical shock required for automotive under-hood use. While SMAJ33CA-E3/5A shares identical electrical specs, only HE3/HM3-marked units are certified for automotive deployment - confirm part marking and packaging code before qualifying for vehicle systems.
How does the bidirectional design of SMAJ33CA-E3/5A affect PCB layout?
The SMAJ33CA-E3/5A has no polarity marking and delivers symmetrical clamping in both directions, allowing placement between any two nodes without regard to voltage polarity - ideal for AC-coupled lines, differential pairs, or floating grounds. Unlike unidirectional TVS diodes, it avoids risk of reverse-bias failure during negative transients. This simplifies layout, reduces BOM count, and eliminates orientation errors during automated assembly - directly supporting zero-defect SMT processes.
What thermal considerations apply when using SMAJ33CA-E3/5A in high-repetition surge environments?
With a junction-to-ambient thermal resistance (RθJA) of 120 °C/W, the SMAJ33CA-E3/5A requires adherence to the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal to dissipate heat from repetitive 400 W pulses. At >0.01% duty cycle, junction temperature rise exceeds safe limits unless additional copper pour or thermal vias are added. Derating curves in Figure 2 of the datasheet must be consulted to determine allowable IPPM at elevated ambient temperatures - especially critical in enclosed industrial enclosures.
Can SMAJ33CA-E3/5A replace SMAJ33A-E3/5A in an existing design?
Yes, SMAJ33CA-E3/5A can directly replace SMAJ33A-E3/5A in most cases because both share identical VWM (33 V), VBR (36.7–40.6 V), VC (53.3 V), and PPPM (400 W) specifications. The only functional difference is polarity: SMAJ33A-E3/5A is unidirectional (cathode-banded) and SMAJ33CA-E3/5A is bidirectional (no band). If the original design relies on directional clamping or includes polarity-dependent circuitry (e.g., series blocking diodes), verify that bidirectional operation does not alter fault-current paths before substitution.
SMAJ33CA-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33CA-E3/5A FAQ
1.How can I place an order for SMAJ33CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CA-E3/5A 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 SMAJ33CA-E3/5A reliable?
The price and inventory of SMAJ33CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ33CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CA-E3/5A?
SMAJ33CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CA-E3/5A 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 SMAJ33CA-E3/5A?
For technical support, including SMAJ33CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ33CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ33CA-E3/5A 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 SMAJ33CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ33CA-E3/5A?
All SMAJ33CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CA-E3/5A, 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 SMAJ33CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ33CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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