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Vishay General Semiconductor - Diodes Division SMCJ28CAHE3/9AT
- Part No.:
- SMCJ28CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CAHE3/9AT.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,045
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Product details
Overview
SMCJ28CAHE3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 28 V standoff voltage (VWM), 45.4 V maximum clamping voltage at 33.0 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom interface protection.
For engineers reviewing the SMCJ28CAHE3/9AT datasheet, SMCJ28CAHE3/9AT pinout, SMCJ28CAHE3/9AT application, or SMCJ28CAHE3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, DO-214AB package thermal performance, and compliance with UL 497B surge protector classification.
Technical Context
This device operates as a voltage-clamped crowbar during transients: its silicon avalanche junction responds in <1 ps to surges exceeding VWM, limiting downstream voltage to ≤45.4 V at 33.0 A. Bidirectional symmetry ensures identical clamping in both polarities without polarity marking on the case.
Thermal design relies on low RθJL (15 °C/W) and RθJA (75 °C/W), enabling sustained operation up to TJ = 150 °C when mounted on 8.0 mm × 8.0 mm copper pads per terminal. The glass-passivated junction and matte tin-plated leads meet JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 31.1 V / 34.4 V at 1.0 mA - Verified breakdown threshold defining clamping onset tolerance |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage under full 1500 W surge, directly limiting IC stress |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform, per ANSI/IEEE C62.35 |
| TJ max | +150 °C - Maximum junction temperature enabling under-hood automotive deployment |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
SMCJ28CAHE3/9AT uses the SMC (DO-214AB) surface-mount package: two-terminal, unmarked bidirectional construction with no cathode/anode designation. Terminals are matte tin-plated leads compatible with J-STD-002 soldering standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no polarity marking required |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically symmetric to Terminal 1; enables placement without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR (31.1–34.4 V) and VC (45.4 V) in both directions eliminates need for polarity-aware layout |
| AEC-Q101 qualification | Validated for automotive electronics including engine control, ADAS sensors, and infotainment power rails |
| UL 497B recognition | QVGQ2 file E136766 certification confirms suitability as primary surge protector in telecom and industrial interfaces |
| Low incremental surge resistance | Enables tight clamping margin (VC/VBR ≈ 1.35) critical for protecting 3.3 V and 5 V logic interfaces |
| MSL Level 1 | Rated for reflow peak of 260 °C, supporting standard lead-free assembly without moisture sensitivity concerns |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V ICs. |
Use Scenario: Shielding 4–20 mA current loop transmitters from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Parallel-connected TVS across signal and return lines to shunt fast transients before reaching analog front-end. Use Value: Sub-nanosecond response ensures clamping occurs before sensitive op-amps or ADCs experience overvoltage stress. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., PoE PSE circuitry) from lightning-induced surges on data lines. IC Role / Device Role / Timing Role: Secondary-level protection coordinated with gas discharge tubes (GDTs) in hybrid surge suppression networks. Use Value: 1500 W PPPM rating supports coordination with upstream GDTs while maintaining low let-through voltage. |
Use Scenario: Preventing output overvoltage events in USB-C PD adapters due to feedback loop failure or transient coupling. IC Role / Device Role / Timing Role: Clamp diode across secondary-side output capacitor to limit voltage excursion during fault conditions. Use Value: 28 V VWM aligns with 20 V USB PD 3.1 maximum, ensuring no conduction during normal operation while reacting to >31 V faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28CA | Lower PPPM (600 W), same VWM (28 V), smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select only for space-constrained consumer applications with verified lower surge exposure |
| SMCJ28AHE3/9AT | Unidirectional version; includes cathode band marking and forward voltage drop (VF = 3.5 V @ 100 A) | Requires polarity-aware PCB layout; not usable in AC-coupled or floating signal paths | Choose only when DC-biased unidirectional protection is confirmed necessary and layout allows orientation control |
Compared with SAC28CA and SMCJ28AHE3/9AT, the SMCJ28CAHE3/9AT uniquely delivers automotive-grade 1500 W bidirectional clamping in DO-214AB without polarity constraints - making it the sole option for high-reliability, orientation-agnostic surge protection in 12 V/24 V systems.
Availability
SMCJ28CAHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ28CAHE3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and UL recognition are mandatory.
FAQ
What is the clamping voltage of SMCJ28CAHE3/9AT at its rated peak pulse current?
The SMCJ28CAHE3/9AT has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 33.0 A, measured using a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is confirmed in the Vishay datasheet Document Number 88394, page 2.
Is SMCJ28CAHE3/9AT qualified for automotive applications?
Yes, SMCJ28CAHE3/9AT is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and explicitly stated in the Vishay datasheet revision 09-Jan-2024. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and humidity bias, validating its use in automotive ECUs and ADAS modules.
Does SMCJ28CAHE3/9AT have polarity markings on the package?
No, SMCJ28CAHE3/9AT is a bidirectional TVS diode and carries no polarity marking on the SMC (DO-214AB) package. Its symmetrical electrical behavior means either terminal functions as anode or cathode depending on transient polarity - eliminating orientation constraints during automated placement.
What is the thermal resistance from junction to ambient for SMCJ28CAHE3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ28CAHE3/9AT is 75 °C/W, measured under standard conditions with 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional heatsinking and is specified in the Thermal Characteristics table of the Vishay datasheet.
How does the SMCJ28CAHE3/9AT differ from the unidirectional SMCJ28AHE3/9AT?
The SMCJ28CAHE3/9AT is bidirectional with identical clamping in both polarities and no cathode band, whereas SMCJ28AHE3/9AT is unidirectional, features a cathode marking, and exhibits forward conduction (VF = 3.5 V at 100 A). Their VWM (28 V) and PPPM (1500 W) are identical, but only the 'CA' version supports AC or floating signal line protection.
SMCJ28CAHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ28CAHE3/9AT FAQ
1.How can I place an order for SMCJ28CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CAHE3/9AT 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 SMCJ28CAHE3/9AT reliable?
The price and inventory of SMCJ28CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ28CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CAHE3/9AT?
SMCJ28CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CAHE3/9AT 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 SMCJ28CAHE3/9AT?
For technical support, including SMCJ28CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ28CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ28CAHE3/9AT 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 SMCJ28CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ28CAHE3/9AT?
All SMCJ28CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CAHE3/9AT, 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 SMCJ28CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ28CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CAHE3/9AT Tags
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