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Vishay General Semiconductor - Diodes Division SMCJ28HE3/9AT
- Part No.:
- SMCJ28HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28HE3/9AT.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,141
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Product details
Overview
SMCJ28HE3/9AT from Vishay General Semiconductor is a surface-mount, AEC-Q101-qualified, bi-directional transient voltage suppressor (TVS) in DO-214AB (SMCJ) package. It features 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V clamping voltage (VC) at 33.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - designed for robust overvoltage protection of automotive sensor signal lines and power rails.
For engineers reviewing the SMCJ28HE3/9AT datasheet, SMCJ28HE3/9AT pinout, SMCJ28HE3/9AT application, or SMCJ28HE3/9AT equivalent, this device delivers validated surge immunity for 12 V and 24 V automotive systems, meets UL 497B recognition, supports automated placement, and offers low incremental surge resistance with MSL Level 1 moisture sensitivity.
Technical Context
The SMCJ28HE3/9AT operates as a bi-directional avalanche diode, responding to both positive and negative transients without polarity dependence. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while thermal resistance (RθJA = 75 °C/W) enables reliable operation up to TJ = 150 °C under pulsed conditions.
Designed per ANSI/IEEE C62.35, it sustains non-repetitive 10/1000 µs surges up to 33.0 A and handles 200 A forward surge (IFSM) in uni-directional configurations - though SMCJ28HE3/9AT itself is bi-directional and unmarked per polarity convention. Its clamping performance (VC = 45.4 V) limits voltage overshoot during ESD and load-dump events in automotive ECUs and ADAS sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates; defines safe interface level for 24 V nominal automotive systems. |
| VBR min/max | 31.1 V / 34.4 V - guaranteed breakdown range at 1.0 mA test current; ensures consistent turn-on across temperature and unit variation. |
| VC @ IPPM | 45.4 V at 33.0 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress below 50 V threshold for most 3.3 V/5 V logic interfaces. |
| PPPM | 1500 W - peak pulse power handling capability; supports ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Level 3 compliance when properly laid out. |
| TJ max | +150 °C - maximum junction temperature; enables under-hood deployment with derated surge capacity above TA = 25 °C per Fig. 2. |
| Package | DO-214AB (SMCJ) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement; supports automated reflow and meets UL 94 V-0. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥ 8 kV); required for front-end sensor and body control modules. |
Pinout & Package
SMCJ28HE3/9AT uses the DO-214AB (SMCJ) package: a bi-directional, unmarked surface-mount device with two terminals - no cathode band or polarity marking. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per datasheet Fig. 4 layout recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient conduction path | Both terminals function identically; conducts surge current in either direction once VBR is exceeded - eliminates orientation concerns during placement. |
| Case (exposed metal slug) | Thermal and mechanical anchor | Not electrically connected; provides primary thermal path to PCB copper; must be soldered to thermal pad for RθJA = 75 °C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics - includes HTOL, temperature cycling, and ESD testing per JESD47; supports Tier-1 BOM inclusion without additional qualification. |
| Bi-directional symmetry | Identical VBR, VC, and IPPM in both directions - simplifies circuit design for AC-coupled or floating signal lines (e.g., CAN FD differential pairs, LIN bus). |
| Low clamping ratio (VC/VBR) | 1.43 (45.4 V / 31.1 V min) - tight voltage control minimizes overvoltage margin needed for protected ICs, reducing need for downstream voltage clamping stages. |
| MSL Level 1 rating | Reflow-compatible up to 260 °C peak - allows standard lead-free assembly without baking or special handling; reduces manufacturing overhead. |
| UL 497B recognition (QVGQ2) | Underwriters Laboratories listed for telecom and industrial protectors - satisfies safety agency requirements for field-deployable equipment without additional system-level certification effort. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point, shunting surge energy before reaching precision ADC front-end. Use Value: Limits transient voltage to ≤45.4 V, preserving 12-bit ADC accuracy and preventing latch-up in 3.3 V supply domains. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) modules subjected to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Fast-response TVS placed upstream of optocoupler input, absorbing 10/1000 µs spikes before isolation barrier. Use Value: Enables >1500 W surge handling without derating at 70 °C ambient, maintaining channel integrity over 10-year industrial service life. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding RS-485 transceiver pins in base station remote units against lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bi-directional clamping element on differential pair, referenced to local ground with minimal parasitic inductance. Use Value: Matches differential mode impedance while clamping common-mode transients to <50 V, meeting IEC 61000-4-5 Level 3. |
Use Scenario: Input-stage surge suppression in universal-input (90–264 VAC) wall adapters for smart home hubs, exposed to EN 61000-4-5 line surges. IC Role / Device Role / Timing Role: Secondary protection after MOV, providing precise low-clamp backup for bridge rectifier and primary-side controller. Use Value: Delivers 45.4 V clamping at 33 A - lower than typical MOV let-through - protecting 600 V MOSFETs and enabling smaller X/Y capacitors. |
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-E3/52T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VBR/VC specs. | Suitable only for lower-energy transients (e.g., ESD-only); not rated for ISO 7637-2 Pulse 5a load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4. |
| 1.5KE27CA | Through-hole TO-218 package, same 27 V VWM (27 V vs. 28 V), 1500 W PPPM, but no AEC-Q101 qualification or MSL Level 1 rating. | Requires wave soldering; unsuitable for automated SMT lines or automotive under-hood use due to qualification gap. | Choose only for legacy through-hole designs where requalification is impractical and automotive compliance is not required. |
Compared with SMAJ28A-E3/52T and 1.5KE27CA, SMCJ28HE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capacity in SMT format, and bi-directional symmetry - making it the only option qualified for new automotive sensor module designs requiring zero-layout compromise and full standards compliance.
Availability
SMCJ28HE3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interface boards, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ28HE3/9AT 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, TVS devices, and MOSFETs with emphasis on high-reliability, automotive-qualified, and industry-standard solutions.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMCJ28HE3/9AT at its rated peak pulse current?
The SMCJ28HE3/9AT has a maximum clamping voltage (VC) of 45.4 V at 33.0 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet Document Number 88394, page 2, Electrical Characteristics table. The clamping performance remains consistent across both polarities due to its bi-directional construction.
Is SMCJ28HE3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMCJ28HE3/9AT is explicitly AEC-Q101 qualified, as noted in the Vishay datasheet revision 11-Dec-12, page 1 (Features section) and page 3 (Notes section). The "HE3" suffix denotes RoHS-compliant, AEC-Q101-qualified grade. It undergoes stress testing including high-temperature operating life, temperature cycling, and ESD (HBM ≥ 8 kV), making it approved for use in engine control units, ADAS sensors, and body electronics.
Does SMCJ28HE3/9AT have polarity markings on the package?
No, SMCJ28HE3/9AT does not have polarity markings. As a bi-directional TVS device, it is unmarked per the Vishay datasheet (page 1, "Polarity" note: "no marking on bi-directional types"). Both terminals are functionally identical, and orientation during placement has no electrical impact - simplifying automated assembly and eliminating risk of reverse installation.
What is the thermal resistance and maximum junction temperature for SMCJ28HE3/9AT?
The SMCJ28HE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads, and a maximum junction temperature (TJ max) of +150 °C. These values are specified in the Thermal Characteristics table (page 3) and Maximum Ratings table (page 1) of the Vishay datasheet 88394. Derating curves in Fig. 2 apply above TA = 25 °C.
How does the SMCJ28HE3/9AT differ from the SMCJ28A-E3/9AT variant?
The SMCJ28HE3/9AT is AEC-Q101 qualified and intended for automotive applications, whereas SMCJ28A-E3/9AT is commercial-grade (base P/N-E3). Both share identical electrical specs (VWM = 28 V, VBR = 31.1–34.4 V, VC = 45.4 V), DO-214AB package, and RoHS compliance, but only the HE3 version carries the AEC-Q101 certification and JESD201 Class 2 whisker resistance - critical for under-hood deployment.
SMCJ28HE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ28HE3/9AT FAQ
1.How can I place an order for SMCJ28HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28HE3/9AT 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 SMCJ28HE3/9AT reliable?
The price and inventory of SMCJ28HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28HE3/9AT?
SMCJ28HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28HE3/9AT 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 SMCJ28HE3/9AT?
For technical support, including SMCJ28HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28HE3/9AT requirements.
6.How does Aetrix verify that SMCJ28HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28HE3/9AT 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 SMCJ28HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28HE3/9AT?
All SMCJ28HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28HE3/9AT, 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 SMCJ28HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28HE3/9AT Tags
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