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Vishay General Semiconductor - Diodes Division SMCJ28-E3/9AT
- Part No.:
- SMCJ28-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28-E3/9AT.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,031
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Product details
Overview
SMCJ28-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR at 1 mA), 45.4 V clamping voltage (VC) at 33.0 A peak pulse current, and 1500 W peak pulse power dissipation with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ28-E3/9AT datasheet, SMCJ28-E3/9AT pinout, SMCJ28-E3/9AT application, or SMCJ28-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and MSL Level 1 moisture sensitivity - all critical for automotive-grade board-level surge protection design and supply chain validation.
Technical Context
The SMCJ28-E3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified VBR range (31.1–34.4 V), with fast response time (<1 ps) and low incremental surge resistance enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes. Its glass-passivated junction ensures stable leakage performance and long-term reliability under repeated surge stress.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power handling while maintaining 6.5 W steady-state power dissipation at TA = 50 °C. Junction temperature is rated from –55 °C to +150 °C, supporting operation in under-hood automotive environments and high-temperature industrial enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 45.4 V at 33.0 A - clamped voltage during 1500 W transient, limiting downstream IC stress |
| PPPM | 1500 W - peak surge power capability with 10/1000 µs waveform, per ANSI/IEEE C62.35 |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine), relevant for fault-current limiting |
| TJ range | –55 °C to +150 °C - enables deployment in automotive engine control modules and industrial PLCs |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, informs heatsinking requirements on PCB |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with cathode band marking. Matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards; E3 suffix indicates JESD 201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V rail or CAN_H); conducts during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Glass-passivated junction | Enhances long-term stability of leakage current and breakdown voltage under thermal cycling and humidity |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V/5 V logic |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive assemblies |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp surges above 34.4 V. Use Value: Limits peak voltage to 45.4 V during 1500 W transients, preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in programmable logic controllers (PLCs) exposed to field wiring surges. IC Role / Device Role / Timing Role: TVS mounted across output terminals to absorb induced lightning transients and relay coil kickback. Use Value: Clamps within <1 ps to hold loop voltage below 45.4 V, preserving DAC accuracy and isolator integrity. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Front-end protection of Ethernet PHY power pins (e.g., 3.3 V bias rails) in telecom base station line cards subjected to ESD and AC-line coupled noise. IC Role / Device Role / Timing Role: Secondary TVS stage after common-mode chokes, shunting differential surges to ground. Use Value: Withstands 1000 V ESD (IEC 61000-4-2) and 1 kV ring wave (IEC 61000-4-5), ensuring PHY uptime in harsh RF environments. | Use Scenario: Overvoltage suppression on H-bridge gate driver supplies in smart home appliance motor inverters (e.g., washing machine drum drives). IC Role / Device Role / Timing Role: Unidirectional clamp on 12 V auxiliary rail feeding gate drivers, triggered by MOSFET switching-induced ringing. Use Value: Maintains VC ≤ 45.4 V during repetitive 33 A pulses, preventing false triggering and gate oxide stress in Si MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/61T | Lower PPPM (400 W), smaller DO-214AC (SMA) package, higher RθJA (110 °C/W) | Suitable for space-constrained consumer boards but insufficient for automotive load dump compliance | Select SMCJ28-E3/9AT where 1500 W surge rating and AEC-Q101 qualification are mandatory |
| SMCJ28AHE3/9AT | Identical electrical specs; HE3 suffix denotes AEC-Q101 qualification (vs. E3's commercial grade) | No functional difference - both meet same VBR, VC, and thermal specs; HE3 adds automotive traceability | Choose SMCJ28-E3/9AT for cost-sensitive industrial designs; select HE3 version for OEM automotive BOMs requiring full qualification documentation |
Compared with SMAJ28A-E3/61T, the SMCJ28-E3/9AT provides 275 % higher surge power handling and lower thermal resistance, making it suitable for under-hood automotive use; versus SMCJ28AHE3/9AT, it offers identical protection performance at lower qualification overhead for non-automotive applications.
Availability
SMCJ28-E3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, and telecom infrastructure requiring stable component supply with full RoHS and MSL Level 1 compliance.
Supply support for SMCJ28-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, and protection devices with emphasis on reliability, ruggedness, and automotive-grade qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2, IEC 61000-4-5, and AEC-Q101-compliant applications across automotive, industrial, and communications systems.
FAQ
What is the clamping voltage of the SMCJ28-E3/9AT under maximum surge conditions?
The SMCJ28-E3/9AT has a maximum clamping voltage (VC) of 45.4 V at 33.0 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a 1500 W transient event. The SMCJ28-E3/9AT maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is the SMCJ28-E3/9AT suitable for automotive applications?
Yes, the SMCJ28-E3/9AT is RoHS-compliant and meets JESD 201 Class 1A whisker resistance, but it is not AEC-Q101 qualified - that designation applies only to the HE3-suffixed variants (e.g., SMCJ28AHE3/9AT). For production automotive use requiring formal qualification, the SMCJ28-E3/9AT may be used in non-safety-critical subsystems pending internal validation; however, the SMCJ28AHE3/9AT is the approved variant for ECU, body control, and ADAS applications.
What does the "E3/9AT" suffix indicate in SMCJ28-E3/9AT?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 1A whisker resistance. The "9AT" refers to the packaging format: 13-inch diameter plastic tape and reel, containing 3500 units. This differs from "57T", which specifies a 7-inch reel with 850 units. Both share identical electrical and thermal specifications.
How does the SMCJ28-E3/9AT compare to bi-directional TVS diodes like SMCJ28CA?
The SMCJ28-E3/9AT is unidirectional and intended for DC circuits where polarity is fixed (e.g., 24 V supply rails), offering lower leakage and tighter VBR tolerance than its bi-directional counterpart SMCJ28CA. The SMCJ28CA supports AC or floating signal lines but exhibits higher reverse leakage and slightly wider VBR spread. For 24 V automotive power distribution, the SMCJ28-E3/9AT provides superior clamping precision and lower standby loss.
What PCB layout guidance applies to the SMCJ28-E3/9AT for optimal surge performance?
To achieve rated 1500 W pulse power, the SMCJ28-E3/9AT must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, per Vishay's recommended pad layout. Trace inductance must be minimized - short, wide traces directly connecting anode to ground and cathode to protected line reduce VL = L·di/dt overshoot. Thermal vias under pads improve heat dissipation during repetitive surges. The SMCJ28-E3/9AT's RθJA of 75 °C/W assumes this layout; deviation increases junction temperature and de-rates surge capability.
SMCJ28-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 30A
- 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)
SMCJ28-E3/9AT FAQ
1.How can I place an order for SMCJ28-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28-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 SMCJ28-E3/9AT reliable?
The price and inventory of SMCJ28-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 SMCJ28-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28-E3/9AT?
SMCJ28-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28-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 SMCJ28-E3/9AT?
For technical support, including SMCJ28-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28-E3/9AT requirements.
6.How does Aetrix verify that SMCJ28-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28-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 SMCJ28-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28-E3/9AT?
All SMCJ28-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28-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 SMCJ28-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28-E3/9AT Tags
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