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Vishay General Semiconductor - Diodes Division SMCJ28AHM3/I
- Part No.:
- SMCJ28AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,008
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Product details
Overview
SMCJ28AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) in SMC (DO-214AB) package, designed for clamping voltage transients up to 45.4 V at 33.0 A peak pulse current (10/1000 μs), with 28 V stand-off voltage and 1500 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ28AHM3/I datasheet, SMCJ28AHM3/I pinout, SMCJ28AHM3/I application, or SMCJ28AHM3/I equivalent, key selection criteria include its 28 V reverse stand-off voltage, 31.1–34.4 V breakdown range at 1 mA, 1.0 μA max reverse leakage at VWM, AEC-Q101 qualification, and halogen-free RoHS-compliant HM3 suffix construction.
Technical Context
The SMCJ28AHM3/I employs a glass-passivated silicon junction optimized for fast response (<1 ns) to ESD and lightning-induced surges. Its low incremental surge resistance ensures stable clamping during repetitive transients, while MSL Level 1 moisture sensitivity supports lead-free reflow without preconditioning.
Designed for unidirectional protection only, it features cathode-band polarity marking and operates over -55 °C to +150 °C junction temperature. Thermal resistance is 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads, enabling reliable operation under sustained surge conditions.
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 IT = 1 mA - Confirmed breakdown threshold for design margining |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage during 1500 W transient, defining protected circuit stress |
| IPPM | 33.0 A (10/1000 μs) - Peak surge current capability with defined waveform compliance |
| PPPM | 1500 W - Peak pulse power handling capacity per single transient event |
| ID @ VWM | ≤1.0 μA - Low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode (banded end) | Current exit point in forward bias; clamping node in reverse bias | Connected to protected line - clamps to ~45.4 V when transient exceeds 28 V |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| Low-profile SMC package | Enables automated placement and high-density PCB layouts without height constraints |
| 1500 W peak pulse power | Supports protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges with margin |
| Fast response time & low clamping ratio | Clamps within nanoseconds with VC/VBR ≈ 1.35, minimizing overvoltage exposure to downstream ICs |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 28 V. Use Value: Limits voltage seen by downstream DC-DC controllers and microcontrollers to ≤45.4 V, preventing latch-up or gate oxide damage. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Standoff-mode protector on 0–5 V or 4–20 mA output lines, grounded at low-impedance point. Use Value: Maintains signal integrity with <1.0 μA leakage at 28 V, avoiding offset errors in precision measurement paths. |
| Telecom Power Input Stage | Consumer Device USB Power Rail |
Use Scenario: Safeguarding AC/DC adapter inputs against lightning-induced surges on PoE or wall-adapter lines. IC Role / Device Role / Timing Role: Primary-level TVS on DC input bus upstream of primary-side controller. Use Value: Absorbs 1500 W pulses without degradation, preserving system uptime in outdoor telecom enclosures. | Use Scenario: Secondary-side overvoltage protection on USB VBUS lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, triggered by hot-swap or adapter fault events. Use Value: Halogen-free HM3 construction meets consumer safety standards while delivering 33 A surge handling at 28 V standoff. |
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 | Lower PPPM (400 W), SMA package (DO-214AC), same VWM/VBR range | Not suitable for 1500 W surge environments; limited to lower-energy transients | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2 |
| SMCJ28A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101), M3 suffix only | Lacks automotive qualification; not approved for under-hood or safety-critical modules | Select for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated |
Compared with SMCJ28AHM3/I, SMAJ28AHE3/A offers reduced surge capacity in a smaller footprint, while SMCJ28A-M3/57T provides identical protection performance without automotive qualification-enabling trade-offs between reliability assurance, physical size, and application environment.
Availability
SMCJ28AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom power input stages, and consumer USB power rail protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ28AHM3/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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where robustness against load dump, ESD, and lightning surges is critical.
FAQ
What is the maximum clamping voltage of the SMCJ28AHM3/I under rated surge conditions?
The SMCJ28AHM3/I clamps to a maximum of 45.4 V when subjected to its rated 33.0 A peak pulse current (10/1000 μs waveform). This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ28AHM3/I maintains this clamping performance across its specified operating temperature range.
Is the SMCJ28AHM3/I suitable for bidirectional transient protection?
No, the SMCJ28AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse breakdown to clamp positive transients on the cathode side. For bidirectional protection, Vishay offers the SMCJ28CA variant. Using SMCJ28AHM3/I in bidirectional applications risks failure during negative-going surges, as it lacks symmetrical clamping capability.
Does the SMCJ28AHM3/I require derating at elevated ambient temperatures?
Yes, the SMCJ28AHM3/I must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet 88394. Its peak pulse power decreases linearly with rising junction temperature, reaching ~75 % of 1500 W at 75 °C ambient on standard PCB pads. Designers must apply thermal modeling or consult the derating curve to ensure safe operation in high-temperature enclosures such as automotive engine compartments.
What does the "HM3" suffix signify in SMCJ28AHM3/I?
"HM3" denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates automotive grade, "M3" confirms halogen-free and RoHS compliance, and the "/I" specifies packaging in 13-inch tape-and-reel (3500 units). This suffix differentiates SMCJ28AHM3/I from commercial variants like SMCJ28A-M3/57T and ensures suitability for automotive production where material compliance and reliability validation are mandatory.
Can the SMCJ28AHM3/I be used in place of older SMCJ28A-E3 parts?
Yes, the SMCJ28AHM3/I is a direct functional replacement for SMCJ28A-E3 with enhanced environmental compliance. Both share identical electrical specifications (VWM, VBR, VC, PPPM) and SMC package dimensions. The HM3 version adds halogen-free materials and AEC-Q101 qualification, making it suitable for new automotive designs where legacy E3 parts may no longer meet material or reliability requirements. No PCB layout changes are needed.
SMCJ28AHM3/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:
- 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/I FAQ
1.How can I place an order for SMCJ28AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHM3/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/I reliable?
The price and inventory of SMCJ28AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMCJ28AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHM3/I?
SMCJ28AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHM3/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/I?
For technical support, including SMCJ28AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHM3/I requirements.
6.How does Aetrix verify that SMCJ28AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMCJ28AHM3/I?
All SMCJ28AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHM3/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/I part is unused and in its original packaging.
Return procedure for SMCJ28AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ28AHM3/I Tags
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