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Vishay General Semiconductor - Diodes Division SMCJ30CA-E3/51T
- Part No.:
- SMCJ30CA-E3/51T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA-E3/51T.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,947
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Product details
Overview
SMCJ30CA-E3/51T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ30CA-E3/51T datasheet, SMCJ30CA-E3/51T pinout, SMCJ30CA-E3/51T application, or SMCJ30CA-E3/51T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin plating, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
The SMCJ30CA-E3/51T operates as a bi-directional avalanche diode, providing symmetrical clamping in both polarities without polarity marking. Its breakdown voltage (VBR) is specified at 33.3–36.8 V (min/max) with 1 mA test current, ensuring reliable triggering above 30 V while maintaining low leakage (<1.0 μA at VWM).
It delivers 1500 W transient power handling per 10/1000 μs waveform, supported by low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown initiates within this range at 1 mA, defining turn-on threshold |
| VC @ IPPM | 48.4 V - Clamped voltage seen by protected circuit during 31.0 A transient event |
| PPPM | 1500 W - Peak transient energy absorption capability with standardized 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - Minimal leakage ensures negligible standby power loss and signal integrity |
| TJ max. | +150 °C - Enables operation in under-hood automotive and high-temperature industrial enclosures |
| RθJA | 75 °C/W - Thermal resistance to ambient on standard 8.0 mm × 8.0 mm copper pads per terminal |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional device with no polarity marking - terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (1) | Transient current path input | Either terminal accepts surge current; bidirectional conduction enables single-device protection across AC or floating lines |
| Anode/Cathode (2) | Transient current path return | Completes low-impedance shunt path to ground or rail; no cathode band marking required |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JESD22 |
| Glass passivated junction | Enhances long-term stability and moisture resistance in humid or condensing environments |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without pre-baking |
| Matte tin plated leads | Ensures solderability per J-STD-002 and JESD22-B102, with JESD201 Class 1A whisker resistance |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for enclosed industrial and automotive systems |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V battery-fed control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Bi-directional TVS placed between power rail and chassis ground to clamp surges up to ±150 V. Use Value: Limits voltage excursion to ≤48.4 V during 31 A transients, preventing damage to MCU I/O and CAN transceivers. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) of pressure/temperature sensors from ESD and field wiring surges. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp across differential or single-ended signal pairs. Use Value: Sub-1.0 μA leakage preserves signal accuracy; 48.4 V clamping protects downstream ADC front-ends. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Surge protection on Ethernet PHY power pins and data line terminations in PoE-powered equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing induced lightning surges coupled onto DC bias or data lanes. Use Value: 1500 W PPPM rating handles multi-kV transients; bi-directionality supports AC-coupled signaling paths. | Use Scenario: Secondary-side overvoltage clamp in AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Final-stage protection element after rectification and bulk capacitance, guarding SMPS controller inputs. Use Value: 30 V VWM aligns with 24 V nominal output rails; RoHS/E3 compliance supports global regulatory certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA-E3/61T | Lower PPPM (400 W), smaller DO-214AC (SMA) package, higher RθJA (110 °C/W) | Suitable only for lower-energy transients; limited thermal margin on dense PCBs | Select when board space is constrained and surge threat level is <500 W |
| 1.5KE30CA | Through-hole TO-218 package, same VWM/VC specs, higher IPPM (43.3 A), but not AEC-Q101 qualified | Lacks automotive qualification; requires wave soldering or hand assembly | Choose for cost-sensitive industrial mains-input protection where AEC-Q101 is not required |
Compared with SMAJ30CA-E3/61T and 1.5KE30CA, the SMCJ30CA-E3/51T provides superior thermal performance (75 °C/W vs. 110 °C/W), AEC-Q101 qualification for automotive use, and 1500 W surge capacity - making it optimal for high-reliability, surface-mount designs exposed to severe transients.
Availability
SMCJ30CA-E3/51T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom line protection, and consumer power adapter designs requiring stable component supply and full traceability.
Supply support for SMCJ30CA-E3/51T 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 and automotive-grade validation.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where robustness and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of the SMCJ30CA-E3/51T under maximum rated surge current?
The SMCJ30CA-E3/51T exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 31.0 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during worst-case transient events. The SMCJ30CA-E3/51T maintains this clamping performance across its full operating temperature range.
Is the SMCJ30CA-E3/51T suitable for automotive applications?
Yes, the SMCJ30CA-E3/51T is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor modules. It meets stress tests for temperature cycling, high-temperature reverse bias, and ESD per JESD22. The SMCJ30CA-E3/51T also complies with RoHS and UL 94 V-0, supporting system-level safety certifications required in modern vehicles.
Does the SMCJ30CA-E3/51T have polarity markings?
No, the SMCJ30CA-E3/51T is a bi-directional TVS diode and carries no polarity marking - consistent with Vishay's designation convention where the "CA" suffix indicates bi-directional functionality. Its DO-214AB package has symmetrical terminals, allowing installation in either orientation without affecting clamping behavior. This simplifies layout and eliminates risk of reverse installation during automated placement.
What is the thermal resistance of the SMCJ30CA-E3/51T, and how is it measured?
The SMCJ30CA-E3/51T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, measured with the device mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal on FR-4 PCB. This value assumes natural convection and defines the temperature rise per watt of sustained power dissipation. The SMCJ30CA-E3/51T's RθJA enables reliable operation up to +150 °C junction temperature under defined layout conditions.
How does the SMCJ30CA-E3/51T differ from uni-directional SMCJ30A variants?
The SMCJ30CA-E3/51T differs from uni-directional SMCJ30A in polarity behavior: it clamps symmetrically for both positive and negative transients, whereas SMCJ30A clamps only in reverse bias and conducts forward like a rectifier. The SMCJ30CA-E3/51T lacks a cathode band marking, has identical VWM (30 V) and VC (48.4 V), but omits IFSM (forward surge) rating since it's not applicable. Its design targets AC-coupled or floating signal lines where bidirectional protection is mandatory.
SMCJ30CA-E3/51T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ30CA-E3/51T FAQ
1.How can I place an order for SMCJ30CA-E3/51T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA-E3/51T 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 SMCJ30CA-E3/51T reliable?
The price and inventory of SMCJ30CA-E3/51T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CA-E3/51T is usually 5 days.
3.What payment methods are accepted for SMCJ30CA-E3/51T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA-E3/51T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA-E3/51T?
SMCJ30CA-E3/51T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA-E3/51T 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 SMCJ30CA-E3/51T?
For technical support, including SMCJ30CA-E3/51T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA-E3/51T requirements.
6.How does Aetrix verify that SMCJ30CA-E3/51T is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA-E3/51T 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 SMCJ30CA-E3/51T meets industry standards.
7.What is the process for return or replacement of SMCJ30CA-E3/51T?
All SMCJ30CA-E3/51T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA-E3/51T, 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 SMCJ30CA-E3/51T part is unused and in its original packaging.
Return procedure for SMCJ30CA-E3/51T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA-E3/51T Tags
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