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Vishay General Semiconductor - Diodes Division SMCJ28CAHM3/I
- Part No.:
- SMCJ28CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28CAHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,460
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Product details
Overview
SMCJ28CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 µs waveform, 45.4 V maximum clamping voltage at 33.0 A peak pulse current, and 28 V stand-off voltage - deployed in automotive sensor signal lines, industrial I/O protection, and telecom interface circuits.
For engineers reviewing the SMCJ28CAHM3/I datasheet, SMCJ28CAHM3/I pinout, SMCJ28CAHM3/I application, or SMCJ28CAHM3/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world surge immunity context for ESD and inductive switching transient suppression.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage VBR of 31.1–34.4 V at 1.0 mA test current and reverse leakage ≤1.0 µA at 28 V stand-off voltage. Its low incremental surge resistance enables fast clamping response (<1 ns), while the glass-passivated junction ensures stable performance under repetitive surge stress.
Thermal design relies on RθJA = 75 °C/W (typ.) and RθJL = 15 °C/W (typ.), requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for rated 1500 W pulse handling. The device is qualified to AEC-Q101 and meets UL 497B recognition (QVGQ2) for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin below clamping threshold |
| VBR min/max | 31.1 V / 34.4 V at 1.0 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events |
| VC @ IPPM | 45.4 V at 33.0 A - Clamping voltage under full 1500 W 10/1000 µs surge; determines protected circuit's worst-case stress level |
| PPPM | 1500 W - Peak pulse power rating with standard 10/1000 µs waveform; defines transient energy absorption capacity |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for thermal design and derating above 25 °C ambient |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm lead spacing; supports automated placement |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant - Meets automotive reliability and environmental requirements for under-hood and chassis applications |
Pinout & Package
SMCJ28CAHM3/I uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no cathode/anode marking; terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Connects across protected line (e.g., RS-485 differential pair or CAN bus); conducts surge current bidirectionally |
| Terminal 2 | Transient input/output node | Second connection point forming symmetrical clamping path; no polarity dependency - interchangeable with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal paths without polarity concerns |
| 1500 W peak pulse rating | Withstands high-energy transients from inductive load switching (e.g., solenoid drivers) without degradation |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance |
| Halogen-free & RoHS | Meets global environmental regulations and eliminates corrosive halogen emissions during board reflow or failure |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; no bake requirement prior to SMT assembly |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) and digital sensor interfaces (e.g., LIN bus) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt surge energy before reaching MCU or ADC front-end. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or gate oxide damage in downstream ASICs while maintaining signal integrity during normal operation. | Use Scenario: Safeguarding programmable logic controller (PLC) digital input modules against field-wiring induced surges from relay coil back-EMF or lightning-induced coupling. IC Role / Device Role / Timing Role: Primary transient suppressor mounted on PCB edge near terminal block, operating in parallel with optocoupler input stage. Use Value: Absorbs 1500 W surges without failure, enabling >100,000 surge cycles per IEC 61000-4-5 Level 4 testing - extending system uptime and reducing field returns. |
| Telecom Data Line Protection | Consumer Power Adapter ESD Guard |
Use Scenario: Shielding Ethernet PHY interfaces (10/100BASE-TX) and PoE-powered device inputs from ESD (IEC 61000-4-2 ±8 kV contact) and surge (IEC 61000-4-5 2 kV line-earth). IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pairs (e.g., TX+/TX−) to clamp common-mode and differential-mode transients simultaneously. Use Value: Sub-1 ns response time and 45.4 V clamping ensure Ethernet MAC/PHY ICs remain within absolute maximum ratings during fast-rising ESD events. | Use Scenario: Adding secondary-level surge protection on DC output rails of wall-mounted AC/DC adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage TVS between adapter output capacitor and downstream USB-PD or 3.3 V LDO regulator input. Use Value: Prevents catastrophic failure of downstream regulators during accidental short-to-ac mains or capacitor discharge events, meeting UL 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHM3/I | Lower PPPM (600 W), smaller SMB (DO-214AA) package, identical VWM/VC specs | Suitable only for lower-energy transients (e.g., ESD-only); not rated for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 or low-energy inductive spikes |
| SMCJ28AHE3/I | Unidirectional version, same package and clamping, but includes cathode band marking and forward conduction capability | Required where DC bias exists (e.g., single-ended power rail protection); incompatible with AC or differential signals | Choose only for unidirectional DC lines - not a drop-in replacement for bidirectional use cases like data buses |
Compared with SMCJ28CAHM3/I, SMBJ28CAHM3/I offers reduced surge robustness in a smaller footprint, while SMCJ28AHE3/I provides forward conduction but sacrifices bidirectional symmetry - making SMCJ28CAHM3/I the optimal choice for balanced, high-energy differential or AC-coupled protection.
Availability
SMCJ28CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom data line interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for SMCJ28CAHM3/I 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 engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ28CAHM3/I under full-rated surge current?
The SMCJ28CAHM3/I clamps to a maximum of 45.4 V when subjected to its rated 33.0 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet Document Number 88394, Revision 09-Jan-2024, and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. Designers must verify that downstream components tolerate this clamping level at their maximum operating current.
Is SMCJ28CAHM3/I suitable for automotive applications?
Yes, SMCJ28CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability validation. It meets requirements for under-hood and chassis-mounted electronics exposed to load dump, jump-start, and ISO 7637-2 pulses. The device is explicitly listed in Vishay's automotive ordering code table (base P/NHM3_X), confirming its suitability for production automotive designs where certified transient protection is mandated.
How does the bidirectional nature of SMCJ28CAHM3/I affect PCB layout?
The bidirectional structure of SMCJ28CAHM3/I eliminates polarity constraints - no cathode marking exists, and either terminal may connect to either side of a protected line. This simplifies layout for differential interfaces (e.g., CAN, RS-485) and AC-coupled signals, allowing direct placement across traces without orientation checks. However, symmetric pad design and equal trace length to both terminals remain critical to preserve impedance balance and avoid skew during fast transients.
What is the thermal resistance and how does it impact power derating?
SMCJ28CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. At ambient temperatures above 25 °C, its peak pulse power must be linearly derated per Figure 2 in the datasheet - e.g., at 75 °C ambient, only ~67 % of 1500 W is sustainable. Effective heat sinking via 8.0 mm × 8.0 mm copper pads per terminal is required to maintain rated performance; insufficient copper area increases RθJA and accelerates thermal runaway during repeated surges.
Can SMCJ28CAHM3/I replace a unidirectional TVS like SMCJ28AHE3/I?
No - SMCJ28CAHM3/I is strictly bidirectional and lacks forward conduction capability, making it incompatible with DC-biased lines requiring unidirectional clamping (e.g., +12 V rail protection). Attempting substitution on a unidirectional circuit risks reverse leakage or failure to clamp positive transients. The SMCJ28AHE3/I variant includes a cathode band and supports forward current up to 200 A, while SMCJ28CAHM3/I provides symmetrical clamping only. Always match device polarity to circuit topology.
SMCJ28CAHM3/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ28CAHM3/I FAQ
1.How can I place an order for SMCJ28CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28CAHM3/I 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 SMCJ28CAHM3/I reliable?
The price and inventory of SMCJ28CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ28CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28CAHM3/I?
SMCJ28CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28CAHM3/I 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 SMCJ28CAHM3/I?
For technical support, including SMCJ28CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28CAHM3/I requirements.
6.How does Aetrix verify that SMCJ28CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ28CAHM3/I 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 SMCJ28CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ28CAHM3/I?
All SMCJ28CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28CAHM3/I, 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 SMCJ28CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ28CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28CAHM3/I Tags
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