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Vishay General Semiconductor - Diodes Division SMCJ28AHM3_A/I
- Part No.:
- SMCJ28AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,474
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Product details
Overview
SMCJ28AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 28 V standoff voltage (VWM), 31.1–34.4 V breakdown range (VBR at 1 mA), and 1500 W peak pulse power (10/1000 µs). It clamps transients to ≤45.4 V at 33 A peak current and operates from –55 °C to +150 °C, targeting automotive power rail and industrial sensor interface protection.
For engineers reviewing the SMCJ28AHM3_A/I datasheet, SMCJ28AHM3_A/I pinout, SMCJ28AHM3_A/I application, or SMCJ28AHM3_A/I equivalent, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance under standardized surge waveforms - critical for ESD/surge hardening in 24 V systems.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for low incremental surge resistance and sub-nanosecond response time, enabling effective suppression of fast-rising transients from inductive switching or lightning-induced surges. Its unidirectional polarity features a cathode band marking and supports DC-biased signal/power lines where reverse conduction must be blocked.
Thermal design relies on RθJA = 75 °C/W (on minimum pad layout) and RθJL = 15 °C/W, with derating above 25 °C per Figure 2. The device meets MSL Level 1 (260 °C reflow peak) and is qualified to AEC-Q101, confirming suitability for automotive under-hood and body-control module applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line voltage (e.g., nominal 24 V DC bus) |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on before downstream IC damage thresholds |
| VC @ IPPM | ≤45.4 V at 33 A - Clamped voltage during 1500 W surge; defines worst-case overvoltage seen by protected circuitry |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity; validates robustness against ISO 7637-2 Pulse 1/2/5a/b events |
| IFSM | 200 A (8.3 ms half-sine) - Forward surge rating; supports protection of rectifier stages or high-current DC inputs |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without thermal shutdown |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.0 mm × 8.0 mm copper pads recommended; compatible with automated placement and reflow |
Pinout & Package
SMCJ28AHM3_A/I uses the standard SMC (DO-214AB) package: two-terminal surface-mount device with cathode marked by a band on one end. Leads are matte tin-plated and solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or low-side return path; conducts only during reverse transient clamping |
| Cathode | Reverse voltage terminal (marked with band) | Connected to protected line (e.g., 24 V supply); blocks forward current but avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for BCM, ADAS power supplies |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU - supports green manufacturing programs |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 11–14 V) versus competing TVS devices - reduces stress on downstream MOSFETs or regulators |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C reflow profile - eliminates baking requirements and simplifies SMT line integration |
| Glass passivated junction | Improves long-term stability and leakage control vs. epoxy-passivated alternatives - critical for low-power sensor interfaces |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump (ISO 7637-2 Pulse 5b) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps 1500 W surges to ≤45.4 V, preventing overvoltage failure of 40 V-rated buck controllers and ensuring ASIL-B system continuity. | Use Scenario: Shielding analog outputs (4–20 mA, 0–10 V) of pressure/temperature sensors from EFT and surge coupling in factory automation cabinets. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting transients before signal conditioning op-amps. Use Value: Sub-ns response and <1 µA leakage at 28 V ensure minimal impact on sensor accuracy while surviving 4 kV EFT bursts per IEC 61000-4-4. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered remote units (e.g., IP cameras) fed via 48 V DC from surge events on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on primary side of isolated DC-DC, coordinated with common-mode chokes. Use Value: 1500 W rating handles telecom-grade lightning surges (IEC 61000-4-5 10/700 µs), while 28 V VWM avoids false triggering during normal 48 V ±10 % operation. | Use Scenario: Protecting gate drivers and microcontrollers in washing machine motor inverters from commutation spikes. IC Role / Device Role / Timing Role: TVS placed across DC bus (between + and GND) near inverter bridge to clamp inductive kickback. Use Value: 200 A IFSM rating supports repeated motor start-stop cycles; halogen-free HM3 suffix meets appliance flame-retardancy standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28AHE3_A/I | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA) | Not suitable for ISO 7637-2 Pulse 5a/b; limited to lower-energy ESD/EFT scenarios | Select when board space is constrained and surge threat level is ≤400 W (e.g., USB port protection) |
| SMCJ28AHE3_A/I | Identical electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant (E3), not halogen-free | Lacks automotive qualification; acceptable for industrial/commercial 24 V systems without AEC requirements | Choose for cost-sensitive non-automotive designs where halogen-free is not mandated |
Compared with SMCJ28AHM3_A/I, SMAJ28AHE3_A/I offers smaller size but sacrifices 73 % surge energy handling, while SMCJ28AHE3_A/I matches performance but omits AEC-Q101 validation and halogen-free compliance - making SMCJ28AHM3_A/I the sole choice for production automotive ECUs requiring both robustness and regulatory alignment.
Availability
SMCJ28AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC feeds, and consumer appliance motor drive protection requiring stable component supply, AEC-Q101 assurance, and halogen-free compliance.
Supply support for SMCJ28AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ28AHM3_A/I under a 1500 W surge?
The SMCJ28AHM3_A/I clamps to a maximum of 45.4 V when subjected to its rated 1500 W peak pulse power (10/1000 µs waveform) at 33 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 88394. The clamping voltage directly determines the overvoltage stress imposed on downstream components, making it a critical parameter for validating protection margins in 24 V systems using the SMCJ28AHM3_A/I.
Is the SMCJ28AHM3_A/I qualified for automotive applications?
Yes, the SMCJ28AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and explicitly stated in the Vishay datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, confirming suitability for automotive under-hood and body electronics. The SMCJ28AHM3_A/I is therefore approved for use in production automotive ECUs where transient protection must meet stringent reliability standards - unlike non-HE3/HM3 variants.
How does the halogen-free status of SMCJ28AHM3_A/I affect its assembly process?
The SMCJ28AHM3_A/I's halogen-free construction (per JEDEC J-STD-20) does not alter reflow profiles - it remains MSL Level 1 and compatible with standard 260 °C peak reflow. However, halogen-free molding compounds reduce corrosive gas emission during soldering, improving long-term reliability in humid or high-bias environments. This makes the SMCJ28AHM3_A/I especially appropriate for sealed automotive modules and industrial controllers where outgassing could degrade conformal coatings or connectors over time.
What is the thermal resistance from junction to ambient for SMCJ28AHM3_A/I, and how does it impact layout?
The SMCJ28AHM3_A/I has a typical RθJA of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, PCB layout must allocate adequate copper area and avoid thermal bottlenecks. For example, at 6.5 W continuous dissipation, a 25 °C ambient requires ≤112.5 °C ΔT - well within the +150 °C TJmax, but derating applies above 25 °C per Figure 2 in the SMCJ28AHM3_A/I datasheet.
Can SMCJ28AHM3_A/I replace bidirectional TVS diodes like SMCJ28CA in a circuit?
No - the SMCJ28AHM3_A/I is unidirectional and must not replace bidirectional types such as SMCJ28CA without circuit redesign. Unidirectional devices conduct only during reverse overvoltage and block forward current, whereas bidirectional types protect both polarities. Using SMCJ28AHM3_A/I in place of SMCJ28CA on AC-coupled or floating lines would leave positive transients unprotected. Always verify polarity alignment and signal bias conditions before substituting the SMCJ28AHM3_A/I in existing designs.
SMCJ28AHM3_A/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:
- 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:
- 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)
SMCJ28AHM3_A/I FAQ
1.How can I place an order for SMCJ28AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHM3_A/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 SMCJ28AHM3_A/I reliable?
The price and inventory of SMCJ28AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ28AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHM3_A/I?
SMCJ28AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHM3_A/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 SMCJ28AHM3_A/I?
For technical support, including SMCJ28AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ28AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHM3_A/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 SMCJ28AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ28AHM3_A/I?
All SMCJ28AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHM3_A/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 SMCJ28AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ28AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28AHM3_A/I Tags
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