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Vishay General Semiconductor - Diodes Division SMCJ28AHM3/H
- Part No.:
- SMCJ28AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ28AHM3/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,860
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Product details
Overview
SMCJ28AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode 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 (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ28AHM3/H datasheet, SMCJ28AHM3/H pinout, SMCJ28AHM3/H application, or SMCJ28AHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance data, junction-to-lead thermal path, and halogen-free RoHS-compliant sourcing details essential for automotive-grade ESD/surge design validation.
Technical Context
The SMCJ28AHM3/H employs a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance, enabling effective suppression of inductive switching spikes and lightning-induced surges on 24 V systems. Its unidirectional polarity (cathode-banded) supports DC rail protection without reverse conduction during normal operation.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, the device sustains 200 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits 0.098 %/°C temperature coefficient of VBR - critical for stable clamping across automotive thermal cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping begins; defines safe DC operating margin for 24 V nominal systems. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system transients but below IC absolute maximum ratings. |
| VC @ IPPM | 45.4 V at 33.0 A - Clamped voltage under full 1500 W surge; limits downstream stress to ≤45.4 V during worst-case 10/1000 µs events. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad heat sinking without external heatsink for intermittent surge duty. |
| TJ max. | +150 °C - Maximum junction temperature; aligns with under-hood automotive environments and industrial control enclosures. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT; suffix HM3 denotes halogen-free compliance. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 molding compound. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line (e.g., 24 V rail); conducts surge current to ground when V > VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU - required for automotive Tier-1 supply chain traceability. |
| AEC-Q101 qualification | Validated for automotive use per stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). |
| Low RθJL (15 °C/W) | Enables efficient heat transfer from junction to PCB copper pads - eliminates need for thermal vias or external heatsinks in most 24 V power rail designs. |
| Fast response time (<1 ns) | Clamps transients before sensitive downstream components (e.g., MCU I/O, CAN transceivers) experience damaging overvoltage. |
| 1500 W PPPM rating | Supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Combination Wave (1.2/50 µs + 8/20 µs) surges in industrial and vehicle ECUs. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 24 V battery-fed ECU input subjected to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail; absorbs >100 V transients within nanoseconds to prevent damage to PMICs and microcontrollers. Use Value: Limits rail voltage to ≤45.4 V during 33 A surge, preserving 3.3 V/5 V regulator input integrity and avoiding brownout resets. |
Use Scenario: Analog output line (0–10 V) from pressure sensor exposed to ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and ADC input; shunts ESD pulses before reaching precision op-amp front-end. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) to <50 V peak, preventing latch-up or offset drift in 16-bit SAR ADC reference paths. |
| DC Motor Drive Gate Driver Protection | Telecom PoE Power Feed Protection |
|
Use Scenario: High-side N-channel MOSFET gate driver supply (12 V) in brushed DC motor controller experiencing inductive kickback. IC Role / Device Role / Timing Role: TVS across gate driver VDD and GND; clamps flyback spikes induced by motor coil energy release. Use Value: Suppresses 100 V+ spikes to ≤45.4 V within <1 ns, protecting gate oxide integrity and preventing false turn-on of power FETs. |
Use Scenario: 48 V DC input to PoE-powered switch port exposed to lightning-induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Secondary TVS on DC feed side after primary gas discharge tube (GDT); handles residual fast-rising transients bypassing GDT. Use Value: Provides sub-50 V clamping for 10/1000 µs surges up to 1500 W, ensuring IEEE 802.3af/at compliance and preventing PHY IC damage. |
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 | Same VWM (28 V), lower PPPM (400 W), SMA package (DO-214AC), RθJA = 100 °C/W vs. 75 °C/W. | Lower surge capacity and higher thermal resistance limit use to low-energy signal lines, not 24 V power rails. | Select only for space-constrained signal-level protection where 1500 W rating is unnecessary. |
| SMCJ28AHE3/H | Identical electrical specs and SMC package, but HE3 suffix indicates RoHS-compliant commercial grade (not AEC-Q101 or halogen-free). | Lacks automotive qualification and halogen-free certification; unsuitable for Tier-1 automotive BOMs requiring HM3 traceability. | Choose SMCJ28AHM3/H when AEC-Q101 and halogen-free compliance are mandatory for production release. |
Compared with SMAJ28AHE3/A and SMCJ28AHE3/H, the SMCJ28AHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for safety-critical 24 V automotive power rail protection with full supply-chain compliance.
Availability
SMCJ28AHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and DC motor drive systems requiring stable component supply with full AEC-Q101 and halogen-free compliance.
Supply support for SMCJ28AHM3/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, and protection devices with emphasis on reliability, automotive qualification, and high-power transient suppression.
The SMCJ series was engineered specifically for high-energy surge protection in harsh environments - targeting automotive power distribution, industrial automation, and telecom infrastructure where 1500 W clamping and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMCJ28AHM3/H under full-rated surge current?
The SMCJ28AHM3/H has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) of 33.0 A using the standard 10/1000 µs waveform. This value is measured at the device terminals under defined test conditions and ensures downstream circuitry remains below destructive voltage thresholds during surge events. The SMCJ28AHM3/H maintains this clamping performance across its specified operating temperature range.
Is the SMCJ28AHM3/H qualified for automotive applications?
Yes, the SMCJ28AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix HM3. This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), validating its suitability for under-hood and chassis-mounted automotive electronics. The SMCJ28AHM3/H is explicitly designated for automotive use in Vishay's preferred ordering information table.
What does the "HM3" suffix indicate in SMCJ28AHM3/H?
The "HM3" suffix in SMCJ28AHM3/H denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance. It distinguishes this variant from commercial-grade HE3 versions and confirms compliance with automotive Tier-1 material declarations. The "H" indicates tape-and-reel packaging (7-inch reel, 850 units), while "M3" certifies halogen-free molding compound and terminations.
How does the thermal performance of SMCJ28AHM3/H compare to smaller packages like SMAJ?
The SMCJ28AHM3/H offers significantly better thermal performance than SMAJ-series devices due to its larger SMC (DO-214AB) package: it achieves RθJL = 15 °C/W versus ~30–40 °C/W for SMAJ, enabling more efficient heat transfer to PCB copper pads. This allows the SMCJ28AHM3/H to sustain repeated 1500 W surges without thermal runaway - a capability SMAJ28AHE3/A (400 W rating) cannot match. The SMCJ28AHM3/H is therefore preferred for high-energy power rail protection.
Can SMCJ28AHM3/H be used in bidirectional configurations?
No, the SMCJ28AHM3/H is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMCJ28CAHM3/H), which has symmetrical breakdown in both directions and no polarity marking. Using SMCJ28AHM3/H in AC or floating signal paths would result in unintended forward conduction during negative half-cycles, potentially damaging the device or circuit.
SMCJ28AHM3/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:
- 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/H FAQ
1.How can I place an order for SMCJ28AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ28AHM3/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 SMCJ28AHM3/H reliable?
The price and inventory of SMCJ28AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ28AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ28AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ28AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ28AHM3/H?
SMCJ28AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ28AHM3/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 SMCJ28AHM3/H?
For technical support, including SMCJ28AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ28AHM3/H requirements.
6.How does Aetrix verify that SMCJ28AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ28AHM3/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 SMCJ28AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ28AHM3/H?
All SMCJ28AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ28AHM3/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 SMCJ28AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ28AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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