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Vishay General Semiconductor - Diodes Division SMCJ33A-E3/9AT
- Part No.:
- SMCJ33A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-E3/9AT.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SMCJ33A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMCJ33A-E3/9AT datasheet, SMCJ33A-E3/9AT pinout, SMCJ33A-E3/9AT application, or SMCJ33A-E3/9AT equivalent, this device is selected for robust overvoltage protection in automotive power rails, industrial sensor interfaces, and DC power supply inputs where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.38), and AEC-Q101-compliant reliability are required.
Technical Context
The SMCJ33A-E3/9AT operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt surge energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at 33 V), while the SMC package provides thermal resistance of 75 °C/W (junction-to-ambient) and supports 200 A non-repetitive forward surge current (IFSM).
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients), with clamping performance validated under standardized 10/1000 µs surge conditions. The device is RoHS-compliant (E3 suffix), halogen-free optional, and rated for operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Tight breakdown window ensures predictable turn-on and compatibility with 3.3 V/5 V/12 V/24 V system margins. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamping voltage limits transient stress on downstream ICs; clamping ratio = 1.38 supports margin-critical designs. |
| PPPM | 1500 W - Peak surge power handling capability with 10/1000 µs waveform; enables protection against severe lightning or load-dump events. |
| IR @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - High junction temperature rating supports under-hood automotive and high-ambient industrial deployments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal relief; MSL Level 1, 260 °C reflow compatible. |
Pinout & Package
SMCJ33A-E3/9AT uses the standard SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated leads. Polarity is marked by a cathode band on the body; the banded end is the cathode (K), and the opposite end is the anode (A). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated thermal and surge performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward current entry / Reverse voltage reference node | Connected to protected line (e.g., 24 V rail); carries surge current during clamping when cathode is grounded. |
| Cathode (K) | Avalanche conduction terminal / Ground reference | Typically tied to system ground or low-impedance return path; establishes reverse-bias polarity for unidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and automated placement without height interference in compact enclosures. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage across temperature and lifetime; eliminates passivation-related drift in harsh environments. |
| 1500 W peak pulse power | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120 V/100 ms in automotive 24 V systems when properly heatsinked. |
| Fast response time <1 ns | Clamps transients before they propagate through traces or damage CMOS inputs, critical for protecting CAN, LIN, and sensor front-ends. |
| AEC-Q101 qualified option | HE3/HM3 variants meet automotive qualification; SMCJ33A-E3/9AT is commercial-grade but shares identical die and construction. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) and body control modules (BCMs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before reaching DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to 53.3 V, well below 60 V absolute maximum ratings of common automotive PMICs and gate drivers. |
Use Scenario: Shielding analog and digital signal lines (e.g., 4–20 mA loop, RS-485, or thermocouple inputs) in factory automation sensors from EFT and ESD coupling. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS mounted directly at connector entry point to absorb sub-100 ns transients before trace inductance amplifies voltage spikes. Use Value: Sub-µA leakage and 53.3 V clamping preserve signal accuracy and prevent false triggering in precision measurement circuits. |
| DC Power Supply Input Protection | Telecom Equipment Surge Suppression |
Use Scenario: Safeguarding AC/DC adapter outputs and PoE-powered device inputs against surges induced by nearby switching loads or grid disturbances. IC Role / Device Role / Timing Role: Primary-level TVS placed after bulk capacitance but before LDO or buck controller to absorb residual energy not filtered by LC stages. Use Value: 1500 W PPPM rating handles repetitive 1 kV/500 A surges per IEC 61000-4-5, extending system uptime in commercial building infrastructure. |
Use Scenario: Hardening Ethernet PHY ports, DSL line cards, and base station backhaul interfaces against lightning-induced surges entering via copper pairs. IC Role / Device Role / Timing Role: Paired with gas discharge tube (GDT) or MOV in hybrid protection network to provide fast secondary clamping after coarse primary suppression. Use Value: Fast avalanche response complements slower primary protectors, reducing let-through voltage to <60 V and preventing PHY IC latch-up or burnout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52T | Same VWM (33 V), lower PPPM (600 W), SMB package (smaller footprint, higher RθJA = 110 °C/W) | Lower surge capacity suits consumer electronics or low-energy signal lines; unsuitable for automotive load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ±8 kV contact discharge only. |
| SMCJ33CA-E3/9AT | Bidirectional variant; same VWM (33 V), symmetric clamping in both polarities; identical PPPM (1500 W) and package | Required for AC-coupled or floating signal paths (e.g., RS-485, audio lines) where polarity reversal occurs. | Choose for bidirectional protection needs; note that unidirectional SMCJ33A-E3/9AT cannot replace it in AC applications. |
Compared with SMBJ33A-E3/52T, the SMCJ33A-E3/9AT delivers 2.5× higher surge power and superior thermal dissipation, making it suitable for demanding industrial and automotive use cases; versus SMCJ33CA-E3/9AT, it offers lower cost and simpler grounding but lacks bidirectional symmetry.
Availability
SMCJ33A-E3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, DC power supply inputs, and telecom line interface circuits requiring stable component supply, full traceability, and long-term production continuity.
Supply support for SMCJ33A-E3/9AT 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, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in automotive, industrial, and telecom systems-delivering consistent clamping performance, AEC-Q101 qualification options, and ruggedized packaging for mission-critical environments.
FAQ
What is the maximum clamping voltage of the SMCJ33A-E3/9AT under rated surge conditions?
The SMCJ33A-E3/9AT has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 28.1 A using the standard 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions and reflects the upper limit of voltage seen by protected circuitry during a worst-case transient event. The SMCJ33A-E3/9AT maintains this clamping performance across its operational temperature range and is validated per IEC 61000-4-5 test protocols.
Is the SMCJ33A-E3/9AT suitable for automotive applications?
The SMCJ33A-E3/9AT is RoHS-compliant and built on the same die and package as AEC-Q101-qualified variants (e.g., SMCJ33A-HE3), but the E3/9AT suffix denotes commercial-grade qualification. It meets key automotive surge standards including ISO 7637-2 Pulse 1, 2a, 3a/b, and 5a when applied with appropriate layout and thermal design. For production automotive programs requiring formal qualification, the HE3 or HM3 suffix versions of SMCJ33A should be specified-but the SMCJ33A-E3/9AT remains widely used in pre-production validation and non-safety-critical subsystems.
How does the SMCJ33A-E3/9AT differ from the SMCJ33CA-E3/9AT?
The SMCJ33A-E3/9AT is unidirectional, with a cathode band marking and asymmetric conduction-clamping only in reverse bias-while the SMCJ33CA-E3/9AT is bidirectional, offering symmetrical clamping for both polarities and no polarity marking. Both share identical VWM (33 V), PPPM (1500 W), and SMC package, but the SMCJ33CA-E3/9AT has dual avalanche junctions. The SMCJ33A-E3/9AT is preferred for DC power rail protection; the CA version is required for AC signals, differential buses, or floating grounds where voltage reversals occur.
What is the thermal resistance and recommended pad layout for the SMCJ33A-E3/9AT?
The SMCJ33A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, with no internal plane connections. To achieve full 1500 W surge rating and avoid thermal runaway during repetitive events, designers must adhere to this layout and ensure adequate airflow or localized heatsinking. The SMCJ33A-E3/9AT also exhibits RθJL = 15 °C/W (junction-to-lead), supporting short-duration pulse handling even with modest copper area.
Can the SMCJ33A-E3/9AT be used in parallel for higher surge current handling?
Parallel operation of SMCJ33A-E3/9AT devices is not recommended due to mismatch in VBR (36.7–40.6 V) and dynamic impedance, which causes uneven current sharing and potential thermal runaway in one unit. For higher surge capacity, select a single higher-rated device (e.g., SMCJ40A or SMCJ43A) or implement staged protection with upstream coarse suppressors (e.g., MOVs or GDTs) followed by the SMCJ33A-E3/9AT as a precision clamping stage. Each SMCJ33A-E3/9AT must be individually routed with matched trace lengths and thermal vias to maintain reliability.
SMCJ33A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ33A-E3/9AT FAQ
1.How can I place an order for SMCJ33A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-E3/9AT 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 SMCJ33A-E3/9AT reliable?
The price and inventory of SMCJ33A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ33A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-E3/9AT?
SMCJ33A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-E3/9AT 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 SMCJ33A-E3/9AT?
For technical support, including SMCJ33A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ33A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-E3/9AT 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 SMCJ33A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ33A-E3/9AT?
All SMCJ33A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-E3/9AT, 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 SMCJ33A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ33A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33A-E3/9AT Tags
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