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Vishay General Semiconductor - Diodes Division SMCJ28AHE3_A/H
- Part No.:
- SMCJ28AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHE3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
SMCJ28AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 28 V stand-off 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 SMCJ28AHE3_A/H datasheet, SMCJ28AHE3_A/H pinout, SMCJ28AHE3_A/H application, or SMCJ28AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, 0.098 %/°C VBR temperature coefficient, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, triggering when transient voltage exceeds its breakdown threshold to divert surge energy away from protected circuitry. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM), while the SMC package provides thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead).
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients), and is rated for operation from –55 °C to +150 °C junction temperature with MSL level 1 moisture sensitivity per J-STD-020.
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 - precise breakdown window defining turn-on consistency |
| VC @ IPPM | 45.4 V at 33.0 A - clamped voltage during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient power handling capability under standardized surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage ensuring minimal standby power loss in battery-critical systems |
| TJ max | +150 °C - extended thermal range supporting under-hood automotive and high-temperature industrial use |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ28AHE3_A/H uses a 2-terminal SMC (DO-214AB) package with cathode indicated by a band on the body. The device has no internal complexity - terminals are electrically symmetric except for polarity: anode (unmarked end) and cathode (banded end). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's thermal derating guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path for clamping loop integrity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JESD22 standards |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across humidity and thermal cycles |
| Low incremental surge resistance | Minimizes VC rise under high di/dt surges, improving clamping precision for fast transients |
| MSL level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow without preconditioning or baking |
| Matte tin-plated leads | Solderable per J-STD-002 and JESD22-B102, eliminating whisker risk per JESD201 class 2 |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery rail in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input fuse and DC-DC converter input to clamp surges before regulation stage. Use Value: Limits transient voltage to ≤45.4 V, protecting 40 V-rated input capacitors and enabling compliance with OEM surge immunity requirements. | Use Scenario: Analog output line (e.g., 4–20 mA current loop) from pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: TVS connected between signal line and ground to absorb ESD (±15 kV contact) and EFT bursts without disrupting 24 V loop bias. Use Value: Sub-1 ns response time and <1.0 µA leakage preserve signal accuracy and prevent false triggers in precision measurement circuits. |
| Telecom DC Power Feeding | Consumer USB-C Port Surge Guard |
Use Scenario: 48 V DC power feed to remote radio unit in outdoor small cell base station. IC Role / Device Role / Timing Role: Primary TVS on PoE-like feed line, coordinated with upstream MOV and downstream TVS array for staged clamping. Use Value: 1500 W PPPM rating handles lightning-induced surges up to 10/1000 µs, reducing need for oversized secondary protection. | Use Scenario: VBUS line in USB-C receptacle on portable monitor subjected to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: First-line unidirectional clamp between connector and USB PD controller, sized to survive repeated ±8 kV contact discharges. Use Value: AEC-Q101 qualification ensures mechanical robustness against board flex and thermal cycling during repeated plug/unplug cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T | Lower PPPM (400 W), same VWM/VBR/VC, SMA package (smaller thermal mass) | Not suitable for automotive load dump or telecom lightning surges requiring ≥1500 W | Select only for space-constrained consumer electronics with lower-energy transients |
| SMCJ28CAHE3_A/H | Bidirectional variant; identical VWM/VBR/VC ratings but symmetrical clamping in both polarities | Required for AC-coupled or differential signal lines where polarity reversal occurs (e.g., RS-485) | Choose when protecting bidirectional data lines or AC-powered subsystems |
Compared with SMAJ28A-E3/57T and SMCJ28CAHE3_A/H, the SMCJ28AHE3_A/H delivers higher surge robustness in a thermally optimized SMC package while maintaining AEC-Q101 qualification - making it optimal for automotive power rails and industrial DC feeds where unidirectional clamping suffices and 1500 W capability is mandatory.
Availability
SMCJ28AHE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC feeding applications requiring stable component supply, long-lifecycle support, and traceable AEC-Q101-compliant sourcing.
Supply support for SMCJ28AHE3_A/H 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 application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity or thermal performance.
FAQ
What is the maximum clamping voltage of SMCJ28AHE3_A/H under a 10/1000 µs surge?
The SMCJ28AHE3_A/H has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 33.0 A using the standard 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components like DC-DC controllers remain within absolute maximum ratings.
Is SMCJ28AHE3_A/H qualified for automotive applications?
Yes, SMCJ28AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet (Document Number: 88394, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, making SMCJ28AHE3_A/H suitable for under-hood and chassis-mounted automotive modules requiring certified reliability.
What is the thermal resistance of SMCJ28AHE3_A/H, and how does it affect PCB layout?
The SMCJ28AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe operation at full 1500 W surge rating, Vishay specifies mounting on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad area increases thermal impedance and requires derating - for example, at TA = 75 °C, peak pulse power drops to ~1000 W per Figure 2 in the datasheet.
How does the leakage current of SMCJ28AHE3_A/H impact low-power designs?
The SMCJ28AHE3_A/H exhibits ≤1.0 µA maximum reverse leakage current (ID) at its 28 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures negligible standby power draw in battery-operated or energy-harvesting systems - for instance, adding less than 28 nW of constant dissipation in a 28 V rail, preserving months of shelf life in always-on IoT sensor nodes powered by coin cells or supercapacitors.
Can SMCJ28AHE3_A/H be used in bidirectional signal protection?
No, SMCJ28AHE3_A/H is a unidirectional TVS diode, with polarity marked by a cathode band and intended for DC rail protection where surge polarity is known and fixed. For bidirectional signal lines such as RS-485, CAN, or AC-coupled audio, the bidirectional variant SMCJ28CAHE3_A/H must be used - it provides symmetrical clamping above and below ground, whereas SMCJ28AHE3_A/H would conduct continuously if reverse-biased beyond its forward voltage (~3.5 V at 100 A).
SMCJ28AHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ28AHE3_A/H FAQ
1.How can I place an order for SMCJ28AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHE3_A/H 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 SMCJ28AHE3_A/H reliable?
The price and inventory of SMCJ28AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ28AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHE3_A/H?
SMCJ28AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHE3_A/H 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 SMCJ28AHE3_A/H?
For technical support, including SMCJ28AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ28AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHE3_A/H 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 SMCJ28AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ28AHE3_A/H?
All SMCJ28AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHE3_A/H, 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 SMCJ28AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ28AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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