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Vishay General Semiconductor - Diodes Division SMCJ28A-E3/9AT
- Part No.:
- SMCJ28A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28A-E3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,902
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Product details
Overview
SMCJ28A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount 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 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 33.0 A peak pulse current (IPPM), 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 SMCJ28A-E3/9AT datasheet, SMCJ28A-E3/9AT pinout, SMCJ28A-E3/9AT application, or SMCJ28A-E3/9AT equivalent, key selection criteria include clamping performance under 33 A surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix variants), RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ28A-E3/9AT operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its response time is sub-nanosecond, enabling suppression of fast transients induced by inductive switching or ESD events.
It is rated for continuous operation from −55 °C to +150 °C junction temperature, with derated peak pulse power above 25 °C per Figure 2. The cathode band denotes polarity, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR @ IT = 1 mA | 31.1–34.4 V - Measured breakdown range confirming tight tolerance for predictable turn-on during overvoltage events. |
| VC @ IPPM = 33.0 A | 45.4 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤45.4 V under full-rated transient. |
| PPPM | 1500 W - Peak pulse power handling capability; supports high-energy transients common in automotive load-dump scenarios. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm pads; enables thermal design validation without heatsink. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms half-sine); validates robustness against short-circuit or inrush events. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential node; defines conduction direction in unidirectional configuration. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for sensitive 3.3 V/5 V logic interfaces. |
| MSL Level 1 compliance | Enables single-reflow assembly without moisture sensitivity concerns; eliminates bake requirements prior to SMT. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants are automotive-qualified; this E3 variant shares identical die and construction for drop-in qualification readiness. |
| UL 497B recognition (QVGQ2) | Validates suitability for telecom and industrial signal-line protection per Underwriters Laboratories safety standards. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V battery-fed ECUs exposed to ISO 7637-2 Pulse 1, 2a, and 5a load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Limits peak voltage to ≤45.4 V during 33 A transients, preserving 36 V-rated input stages and avoiding brownout resets. |
Use Scenario: 4–20 mA current-loop sensors in factory automation subject to cable-induced ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted across sensor output terminals to shunt transients away from analog front-end amplifiers and ADCs. Use Value: Sub-ns response clamps <1 kV ESD (IEC 61000-4-2) to <45.4 V within 1 ns, preventing latch-up in precision op-amps. |
| Telecom DC Power Feeds | Consumer Power Adapter Output Protection |
|
Use Scenario: -48 V DC distribution in base station power shelves encountering lightning-induced surges on long feeder lines. IC Role / Device Role / Timing Role: Primary-stage TVS on input bus, coordinated with upstream MOVs to handle multi-kA events. Use Value: 1500 W PPPM rating sustains multiple 10/1000 µs surges without degradation, extending field service life. |
Use Scenario: USB-C PD adapter secondary-side 20 V output lines vulnerable to hot-plug transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: Final-stage TVS between output and connector to protect connected devices during insertion/removal. Use Value: 28 V VWM provides 8 V margin above 20 V nominal, while 45.4 V VC ensures USB PD controller remains below ABS MAX ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/52T | Same VWM/VBR/VC, but SMB (DO-214AA) package - 30 % smaller footprint, 500 W PPPM rating. | Limited to lower-energy transients; unsuitable for automotive load-dump or telecom surge standards. | Select when board space is constrained and surge energy is ≤500 W (e.g., consumer USB ports). |
| SMCJ28CA-E3/9AT | Bidirectional variant - identical VWM/VBR/VC specs, but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs. | Choose only when bidirectional protection is mandatory; unidirectional SMCJ28A-E3/9AT offers lower leakage and tighter VBR tolerance. |
Compared with SMBJ28A-E3/52T, the SMCJ28A-E3/9AT delivers 3× higher surge power handling in the same mounting height; versus SMCJ28CA-E3/9AT, it provides superior unidirectional leakage control (<1 µA at 28 V) and avoids unnecessary bidirectional complexity in DC-rail applications.
Availability
SMCJ28A-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor modules, and telecom power supplies requiring stable component supply, RoHS compliance, and SMT-ready packaging in 13" tape-and-reel (3500 pcs/reel).
Supply support for SMCJ28A-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 automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure resilience and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of the SMCJ28A-E3/9AT under full-rated surge current?
The SMCJ28A-E3/9AT has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated 33.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured and guaranteed per the Vishay datasheet revision 09-Jan-2024, ensuring downstream circuitry remains within safe voltage limits during worst-case transients. The SMCJ28A-E3/9AT achieves this clamping performance while maintaining low incremental resistance and sub-nanosecond response.
Is the SMCJ28A-E3/9AT qualified for automotive applications?
The SMCJ28A-E3/9AT itself carries the commercial-grade E3 suffix and is not AEC-Q101 qualified; however, it shares identical die, construction, and test methodology with the AEC-Q101-qualified SMCJ28AHE3_X variant (HE3 suffix). Engineers may use the SMCJ28A-E3/9AT for prototyping and non-safety-critical automotive subsystems, then migrate to HE3 for production. The SMCJ28A-E3/9AT meets MSL Level 1 and UL 497B - key prerequisites for automotive qualification pathways.
How does the SMCJ28A-E3/9AT compare to the SMBJ28A-E3/52T in terms of surge handling?
The SMCJ28A-E3/9AT delivers 1500 W peak pulse power (PPPM) versus 500 W for the SMBJ28A-E3/52T - a 3× higher energy absorption capacity. This difference stems from the larger SMC (DO-214AB) package's superior thermal mass and lower RθJA (75 °C/W vs. ~100 °C/W for SMB). For applications like automotive load-dump or telecom lightning protection, the SMCJ28A-E3/9AT is required; the SMBJ28A-E3/52T suits space-constrained, lower-energy uses such as USB data lines. Both share identical VWM and VC specs.
What is the thermal resistance and how does it affect PCB layout for the SMCJ28A-E3/9AT?
The SMCJ28A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. This value assumes no additional heatsinking and defines the temperature rise per watt of average power dissipation. To maintain TJ ≤ 150 °C at 6.5 W steady-state dissipation, ambient must stay ≤ 49 °C - reinforcing the need for adequate copper area and airflow. Layouts using smaller pads will degrade RθJA and risk thermal runaway during repetitive surges.
Can the SMCJ28A-E3/9AT be used in bidirectional signal protection?
No - the SMCJ28A-E3/9AT is strictly unidirectional and must be oriented with cathode toward the protected line and anode to ground. For bidirectional signal lines (e.g., RS-485, CAN, audio), the SMCJ28CA-E3/9AT is the correct variant: it provides symmetrical clamping in both polarities with identical VWM, VBR, and VC ratings. Using the unidirectional SMCJ28A-E3/9AT on AC-coupled or floating nodes risks reverse breakdown failure or ineffective protection during negative transients.
SMCJ28A-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SMCJ28A-E3/9AT FAQ
1.How can I place an order for SMCJ28A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28A-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 SMCJ28A-E3/9AT reliable?
The price and inventory of SMCJ28A-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 SMCJ28A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28A-E3/9AT?
SMCJ28A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28A-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 SMCJ28A-E3/9AT?
For technical support, including SMCJ28A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ28A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28A-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 SMCJ28A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28A-E3/9AT?
All SMCJ28A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28A-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 SMCJ28A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28A-E3/9AT Tags
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