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Vishay General Semiconductor - Diodes Division SMBJ28AHM3_B/H
- Part No.:
- SMBJ28AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3_B/H.pdf
- Description:
- 600W,28V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,808
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Product details
Overview
SMBJ28AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 13.2 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform.
For engineers reviewing the SMBJ28AHM3_B/H datasheet, SMBJ28AHM3_B/H pinout, SMBJ28AHM3_B/H application, or SMBJ28AHM3_B/H equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines in industrial control, automotive subsystems, and telecom infrastructure where halogen-free, RoHS-compliant, and AEC-Q101-qualified components are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for stable avalanche behavior under transient stress. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, EFT, and surge events per IEC 61000-4-2/4-4/4-5.
The SMBJ28AHM3_B/H is rated for 150 °C maximum junction temperature and exhibits a +0.098 %/°C temperature coefficient of VBR, ensuring predictable voltage threshold drift across operating conditions. It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V DC systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensures reliable triggering above system nominal voltage with margin. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage during 600 W transient limits downstream component stress to safe levels. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform enables compliance with IEC 61000-4-5 Level 4 (4 kV) |
| IFSM | 100 A - Non-repetitive forward surge current rating supports high-energy inductive turn-off events. |
| TJ max | +150 °C - Junction temperature limit allows operation in under-hood or enclosed industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.21 mm × 4.06 mm footprint and 2.20 mm height for automated assembly. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band. Matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VWM. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail or signal); band-marked end indicates polarity orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables single-device protection against IEC 61000-4-5 4 kV surge on 24 V lines without cascaded staging. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising thermal performance. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock testing. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during clamping, protecting downstream ICs with tight absolute maximum ratings. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power inputs against load dump and inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt transient energy before it reaches DC/DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤45.4 V during 13.2 A surges, preventing latch-up or permanent damage to 36 V-rated power management ICs. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to battery transients and ESD in door modules and lighting controllers. IC Role / Device Role / Timing Role: Standoff-clamp protector on 12 V auxiliary rails, activated only during >28 V events while remaining invisible to normal operation. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1/2a/5a tests with no degradation after 1000+ surge cycles due to stable avalanche characteristics. |
| Telecom Power Feeds | Factory Automation I/O Modules |
Use Scenario: Overvoltage hardening of -48 V DC telecom power distribution boards subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary clamping element on input stage, coordinated with upstream fuses and secondary filtering to meet GR-1089-CORE requirements. Use Value: Delivers 600 W pulse handling at -48 V system level with verified clamping stability across -40 °C to +125 °C ambient. |
Use Scenario: Input protection for isolated digital input cards receiving 24 V dry contact signals in PLC backplanes. IC Role / Device Role / Timing Role: Front-end transient suppressor on each channel, placed before optocoupler input to prevent false triggering or LED damage. Use Value: Withstands repeated 1 kV/500 A surge pulses per IEC 61000-4-5 without parameter shift, ensuring long-term BOM stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHE3_B/H | Same electrical specs, but RoHS-compliant with lead-based finish (E3 suffix) instead of halogen-free (M3). | Not qualified to AEC-Q101; suitable for commercial/industrial use where automotive qualification is not mandated. | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is unnecessary. |
| SMAJ28A-M3 | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4; preferred for space-constrained consumer PCBs. | Choose only if board area is critical and surge threat level is ≤2 kV; verify thermal derating at full load. |
Compared with SMBJ28AHM3_B/H, the SMBJ28AHE3_B/H offers identical protection performance without halogen-free assurance, while the SMAJ28A-M3 sacrifices 33 % pulse power headroom and thermal robustness for reduced size-making the SMBJ28AHM3_B/H optimal for high-reliability 24 V industrial and automotive applications demanding AEC-Q101 and halogen-free compliance.
Availability
SMBJ28AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-term lifecycle support, and certified environmental compliance.
Supply support for SMBJ28AHM3_B/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, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ28AHM3_B/H at its rated peak pulse current?
The SMBJ28AHM3_B/H has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed per the Vishay datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ28AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ28AHM3_B/H qualified for automotive applications?
Yes, SMBJ28AHM3_B/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's SMBJ5.0A–SMBJ188A datasheet (Document Number: 88392). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock-validating SMBJ28AHM3_B/H for use in automotive body electronics, infotainment power supplies, and ADAS sensor interfaces.
What does the "HM3" suffix indicate in SMBJ28AHM3_B/H?
The "HM3" suffix in SMBJ28AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" identifies the halogen-free molding compound, "M3" confirms RoHS compliance and JESD 201 Class 2 whisker resistance, and the underscore "_B/H" specifies tape-and-reel packaging in 7″ reels (750 units per reel). This distinguishes SMBJ28AHM3_B/H from E3 (lead-based RoHS) or HE3 (AEC-Q101 + E3) variants.
Can SMBJ28AHM3_B/H be used in bidirectional protection circuits?
No, SMBJ28AHM3_B/H is a unidirectional TVS diode, as indicated by the "A" suffix and cathode-band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ28CA). Using SMBJ28AHM3_B/H in reverse-biased configurations risks permanent junction damage due to lack of symmetrical avalanche capability-always confirm polarity alignment during layout to ensure the cathode connects to the protected line.
What is the thermal resistance from junction to ambient for SMBJ28AHM3_B/H?
The typical thermal resistance from junction to ambient (RθJA) for SMBJ28AHM3_B/H is 100 °C/W, measured on the standard 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pad layout per JEDEC standards. This value assumes no additional heatsinking and must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet. For sustained power dissipation, PCB copper area and airflow should be optimized to maintain TJ ≤ 150 °C.
SMBJ28AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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):
- 13.2A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ28AHM3_B/H FAQ
1.How can I place an order for SMBJ28AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3_B/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 SMBJ28AHM3_B/H reliable?
The price and inventory of SMBJ28AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3_B/H?
SMBJ28AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3_B/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 SMBJ28AHM3_B/H?
For technical support, including SMBJ28AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ28AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3_B/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 SMBJ28AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3_B/H?
All SMBJ28AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3_B/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 SMBJ28AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ28AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3_B/H Tags
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