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Vishay General Semiconductor - Diodes Division SMCJ33-E3/57T
- Part No.:
- SMCJ33-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33-E3/57T.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,730
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Product details
Overview
SMCJ33-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 28.1 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ33-E3/57T datasheet, SMCJ33-E3/57T pinout, SMCJ33-E3/57T application, or SMCJ33-E3/57T equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant packaging, and real-world design implications for surge immunity in 12 V/24 V systems.
Technical Context
The SMCJ33-E3/57T operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 36.7–40.6 V breakdown range (VBR) at 1 mA test current. Its low incremental surge resistance enables rapid energy diversion during transients such as ISO 7637-2 pulse 1/2a/5a or IEC 61000-4-5 surges.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, it sustains 200 A non-repetitive forward surge current (IFSM) and operates across –55 °C to +150 °C junction temperature range, with thermal resistance from junction-to-ambient rated at 75 °C/W under standard mounting conditions.
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 24 V nominal systems. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system overvoltage tolerance. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 1500 W transient; determines protected IC's maximum stress level under surge. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; supports high-energy lightning-induced transients per IEC 61000-4-5. |
| IPPM | 28.1 A - Peak pulse current capability; sets minimum PCB trace width and fuse coordination requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs heatsinking needs for repetitive surge duty cycles. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge events (rare in TVS use). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail); avalanches into low-impedance state when VAK > VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power supplies. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns - eliminates pre-bake requirement in SMT lines. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1 µA at VWM) over lifetime - critical for low-power always-on sensor nodes. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving protection margin for downstream MOSFETs. |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU with no exemptions required - supports global market access and environmental compliance reporting. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power input of body control modules against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp voltage spikes exceeding 33 V. Use Value: Limits rail voltage to ≤53.3 V during 1500 W surges, preventing damage to LDOs and microcontrollers rated for 40 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: TVS mounted across signal and return lines to absorb ESD and switching noise from nearby solenoid drivers. Use Value: Clamps transients within 1 ns response time while maintaining <1 µA leakage at 33 V, preserving signal accuracy and ADC resolution. |
| Telecom DC Power Feeds | Consumer Device USB Port Protection |
Use Scenario: Overvoltage protection on –48 V DC telecom power distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to system ground, absorbing positive-going transients on negative rails. Use Value: Withstands 200 A single half-sine surge (8.3 ms), enabling compliance with GR-1089-CORE Level 3 surge immunity requirements. |
Use Scenario: Secondary-level protection on 5 V USB VBUS lines in smart home hubs, supplementing primary ESD diodes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB controller to handle sustained overvoltage (e.g., adapter fault). Use Value: Provides 1500 W surge capacity beyond typical ESD diodes' 30 W rating, blocking destructive 33–53 V overvoltage events before IC latch-up occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), smaller DO-214AC (SMA) package, same VWM/VC specs. | Not suitable for high-energy surges (e.g., ISO 7637-2 pulse 5a); limited to board-level ESD and low-energy switching noise. | Select when space-constrained layouts require smaller footprint and surge threat level is ≤400 W. |
| SMCJ33AHE3/57T | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and RoHS compliance. | Required for automotive OEM designs mandating full AEC-Q101 documentation and traceability; otherwise functionally interchangeable. | Choose SMCJ33AHE3/57T for Tier 1 automotive BOMs; SMCJ33-E3/57T suffices for industrial/commercial use with AEC-Q101 optional. |
Compared with SMAJ33A-E3/57T, the SMCJ33-E3/57T delivers 275 % higher surge power handling in the same mounting area, while SMCJ33AHE3/57T adds certified automotive qualification without altering electrical performance - enabling direct substitution where qualification is mandated.
Availability
SMCJ33-E3/57T is available at Aetrix Electronics and suitable for automotive power inputs, industrial sensor interfaces, telecom DC feeds, and consumer USB protection requiring stable component supply and long-term production continuity.
Supply support for SMCJ33-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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom infrastructure where sustained surge immunity and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ33-E3/57T under maximum surge conditions?
The SMCJ33-E3/57T clamps to a maximum of 53.3 V when subjected to its rated 28.1 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SMCJ33-E3/57T maintains this clamping performance across its full operating temperature range.
Is the SMCJ33-E3/57T suitable for automotive applications?
Yes, the SMCJ33-E3/57T is RoHS-compliant and meets MSL Level 1 per J-STD-020, but it is not AEC-Q101 qualified. For automotive use requiring formal qualification, the SMCJ33AHE3/57T variant must be selected. The SMCJ33-E3/57T remains appropriate for non-OEM automotive aftermarket or commercial-grade vehicle electronics where AEC-Q101 is not mandated. Always verify system-level compliance requirements before final selection of SMCJ33-E3/57T.
What does the "E3/57T" suffix indicate in SMCJ33-E3/57T?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance. The "57T" indicates packaging in 7-inch plastic tape-and-reel format containing 850 units. This ordering code ensures traceable, standardized logistics compatible with automated SMT placement equipment. The SMCJ33-E3/57T is not identical to SMCJ33AHE3/57T, which carries the HE3 automotive qualification suffix.
How does the SMCJ33-E3/57T compare to bi-directional TVS diodes like SMCJ33CA?
The SMCJ33-E3/57T is unidirectional and intended for DC line protection where polarity is fixed (e.g., +24 V to GND). In contrast, SMCJ33CA is bi-directional with symmetric clamping in both polarities, suited for AC lines or data signals with no defined DC bias. The SMCJ33-E3/57T offers lower leakage (<1 µA at 33 V) than SMCJ33CA (≤10 µA), making it preferable for low-power standby circuits. Use SMCJ33-E3/57T only where circuit topology guarantees correct polarity alignment.
What is the thermal resistance of the SMCJ33-E3/57T, and how does it affect layout design?
The SMCJ33-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive ambient temperature buildup. Layouts using internal ground planes can reduce RθJA by up to 30 %, directly improving SMCJ33-E3/57T's surge endurance.
SMCJ33-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:
- 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):
- 25.4A
- 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)
SMCJ33-E3/57T FAQ
1.How can I place an order for SMCJ33-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33-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 SMCJ33-E3/57T reliable?
The price and inventory of SMCJ33-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 SMCJ33-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ33-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33-E3/57T?
SMCJ33-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33-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 SMCJ33-E3/57T?
For technical support, including SMCJ33-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33-E3/57T requirements.
6.How does Aetrix verify that SMCJ33-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ33-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 SMCJ33-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ33-E3/57T?
All SMCJ33-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33-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 SMCJ33-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ33-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33-E3/57T Tags
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