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Vishay General Semiconductor - Diodes Division SMCJ33A-E3/57T
- Part No.:
- SMCJ33A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-E3/57T.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,699
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Product details
Overview
SMCJ33A-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ33A-E3/57T datasheet, SMCJ33A-E3/57T pinout, SMCJ33A-E3/57T application, or SMCJ33A-E3/57T equivalent, key selection criteria include clamping performance under 28.1 A surge, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SMCJ33A-E3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its clamping action begins at VBR ≥ 36.7 V and limits transient voltages to ≤53.3 V at rated IPPM, with <1 ns response time and 0.1 %/°C temperature coefficient of VBR.
Designed for surface-mount automated placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal, it meets J-STD-020 MSL Level 1 (260 °C reflow peak) and supports surge immunity up to 200 A IFSM (8.3 ms half-sine) - critical for protecting downstream MOSFETs and ICs against inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin |
| VBR min/max | 36.7 V / 40.6 V at IT = 1 mA - ensures reliable avalanche initiation across process variation and temperature |
| VC @ IPPM | 53.3 V at 28.1 A (10/1000 μs) - peak clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 1500 W - peak transient energy absorption capability without failure under standardized surge waveform |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard pad layout; determines derating above 25 °C |
| TJ max | +150 °C - maximum allowable junction temperature; enables operation in under-hood automotive environments |
| Polarity | Unidirectional - cathode marked by band; blocks reverse conduction until breakdown, ideal for DC bus protection |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0, 0.305" × 0.220" footprint, matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected line; conducts when transient exceeds VBR, shunting current to ground |
| Anode | Ground reference terminal | Typically tied to system ground plane; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1 compliance | Enables direct placement into high-temperature reflow processes without pre-baking |
| RoHS-compliant E3 suffix | Meets global environmental regulations; matte tin plating ensures solderability and whisker resistance |
| 1500 W PPPM rating | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) in properly designed layouts |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach LDOs and microcontrollers. Use Value: Limits transient voltage to ≤53.3 V at 28.1 A, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: 4–20 mA current loop sensors in factory automation subject to ESD and cable-induced transients. IC Role / Device Role / Timing Role: TVS mounted across signal and return lines to absorb ±8 kV contact ESD (IEC 61000-4-2) and inductive kickback. Use Value: Sub-1 ns response and 53.3 V clamping protect precision op-amps and ADC front-ends without signal distortion. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: 48 V input to isolated buck converter in PoE-powered equipment experiencing lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk input capacitor, coordinated with upstream fusing and common-mode chokes. Use Value: 1500 W PPPM handles 10/1000 μs surges up to 28.1 A while maintaining thermal stability (RθJA = 75 °C/W). | Use Scenario: DSL or Ethernet line interface cards requiring IEC 61000-4-5 surge immunity on data pairs. IC Role / Device Role / Timing Role: Paired unidirectional SMCJ33A-E3/57T devices used in back-to-back configuration for bidirectional protection. Use Value: Enables cost-effective adaptation to bidirectional threats without dedicated CA-series parts, preserving board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33-030 | Lower PPPM (300 W), smaller SOD-323 package, higher VC (60 V at 5 A) | Better suited for low-energy signal-line ESD only; insufficient for 1500 W load-dump events | Select only for space-constrained, low-power signal paths where 28.1 A surge current is not required |
| 1.5KE33A | Through-hole DO-201 package, identical VWM/VBR/VC specs, same 1500 W rating | Requires wave soldering or hand assembly; incompatible with automated SMT lines | Choose when legacy through-hole design or manual repair constraints prohibit SMC footprint adoption |
Compared with SAC33-030 and 1.5KE33A, the SMCJ33A-E3/57T uniquely combines high-energy SMT compatibility, AEC-Q101 upgrade path (via HE3), and industry-standard SMC thermal pad layout - making it optimal for volume automotive and industrial PCBs requiring automated assembly and robust surge handling.
Availability
SMCJ33A-E3/57T is available at Aetrix Electronics and suitable for automotive control units, industrial PLC I/O modules, and telecom power entry designs requiring stable component supply, consistent RoHS compliance, and traceable lot-level documentation.
Supply support for SMCJ33A-E3/57T 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and thermal robustness.
FAQ
What is the maximum clamping voltage of the SMCJ33A-E3/57T under rated surge conditions?
The SMCJ33A-E3/57T has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 28.1 A using the standard 10/1000 μs waveform. This value is measured at the device terminals under specified test conditions and represents the highest voltage the protected circuit will experience during a full-rated transient event. The SMCJ33A-E3/57T maintains this clamping performance across its operational temperature range and is validated per ANSI/IEEE C62.35 standards.
Is the SMCJ33A-E3/57T suitable for automotive applications?
Yes, the SMCJ33A-E3/57T is suitable for automotive applications as a robust transient suppressor, especially in non-safety-critical subsystems such as body control modules and infotainment power supplies. While the base SMCJ33A-E3/57T is commercial-grade, Vishay offers AEC-Q101 qualified versions under the HE3 suffix (e.g., SMCJ33AHE3). The SMCJ33A-E3/57T shares identical electrical characteristics and thermal performance with those qualified variants, enabling seamless qualification migration when needed.
What does the "E3/57T" suffix indicate in SMCJ33A-E3/57T?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, while "57T" specifies the packaging format: 7-inch diameter plastic tape and reel containing 850 units. This configuration ensures compatibility with high-speed pick-and-place equipment and supports standard SMT assembly workflows. The SMCJ33A-E3/57T is not halogen-free (that requires M3 suffix) nor AEC-Q101 qualified (which requires HE3 or HM3).
How does the SMCJ33A-E3/57T compare to bidirectional TVS diodes like SMCJ33CA?
The SMCJ33A-E3/57T is unidirectional and features a cathode band marking, whereas SMCJ33CA is bidirectional with no polarity marking and symmetric breakdown in both directions. Electrically, SMCJ33CA has identical VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V) ratings but supports AC or floating-line protection. The SMCJ33A-E3/57T is preferred for DC rail protection where reverse conduction must be blocked; SMCJ33CA is selected when signal lines require symmetrical clamping without ground reference constraints.
What is the thermal resistance and maximum junction temperature of the SMCJ33A-E3/57T?
The SMCJ33A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, and a maximum junction temperature (TJ max) of +150 °C. This allows sustained operation in under-hood automotive environments and industrial enclosures up to +105 °C ambient, provided appropriate PCB copper area and airflow are maintained. Derating curves in the datasheet (Fig. 2) define safe power dissipation limits above 25 °C ambient.
SMCJ33A-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCJ33A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ33A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-E3/57T?
SMCJ33A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-E3/57T 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-E3/57T?
For technical support, including SMCJ33A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-E3/57T requirements.
6.How does Aetrix verify that SMCJ33A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33A-E3/57T?
All SMCJ33A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ33A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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