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Vishay General Semiconductor - Diodes Division SMBJ28AHM3/I
- Part No.:
- SMBJ28AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,672
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Product details
Overview
SMBJ28AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and lightning-induced surges on power and signal lines. It features 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 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ28AHM3/I datasheet, SMBJ28AHM3/I pinout, SMBJ28AHM3/I application, or SMBJ28AHM3/I equivalent, this part delivers verified surge immunity for 24 V DC power rails, automotive body electronics, and industrial I/O modules where AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior under repetitive transient stress. Its thermal resistance (RθJA = 100 °C/W) and junction temperature limit (TJ = 150 °C) support operation on standard PCB copper pads without heatsinking in intermittent surge conditions.
The SMBJ28AHM3/I meets JESD22-B102 solderability and JESD201 Class 2 whisker resistance requirements, and its 0.098 %/°C VBR temperature coefficient ensures predictable clamping across -55 °C to +150 °C ambient range - critical for under-hood automotive and factory automation environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for DC rail protection without false triggering |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed avalanche onset window; defines minimum overvoltage threshold for reliable clamping activation |
| VC @ IPPM | 45.4 V at 13.2 A - clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream components |
| PPPM | 600 W - peak pulse power handling capability; supports single-event surge energy up to 600 mJ (at 1 ms duration) |
| IFSM | 100 A - non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental polarity reversal events |
| TJ max. | +150 °C - maximum junction temperature; enables use in high-ambient environments like engine control units and PLC backplanes |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), unidirectional configuration with cathode indicated by molded band. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail or signal trace); blocks reverse current until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables suppression of high-energy transients from relay coil flyback or ESD events without degradation over rated duty cycle (0.01 %) |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - suitable for body control modules |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; eliminates brominated flame retardants in molding compound |
| MSL Level 1 (260 °C peak reflow) | Allows single-pass lead-free reflow soldering without preconditioning; eliminates moisture-related popcorning risk |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response time), improving protection margin for sensitive CMOS inputs |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensors against inductive kickback from 24 V solenoid valves and BLDC motor controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp voltage spikes exceeding 28 V. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces downstream of isolated DC/DC converters. |
Use Scenario: Surge suppression on LIN bus lines and door module power inputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across battery feed and chassis ground to absorb ISO 7637-2 Pulse 1/2a/5a energy. Use Value: Withstands 100 A surge (8.3 ms) and maintains <1 µA leakage at 28 V, ensuring no impact on LIN bus quiescent current budget. |
| Factory Automation I/O Cards | Telecom Power Supply Inputs |
|
Use Scenario: Input protection for 24 V digital input modules receiving signals from proximity switches and photoelectric sensors. IC Role / Device Role / Timing Role: Primary clamping device on field-side terminals, coordinated with series impedance for IEC 61000-4-5 Level 4 compliance. Use Value: Delivers 600 W pulse handling with 0.098 %/°C VBR drift, ensuring consistent clamping performance across -40 °C to +70 °C operating range. |
Use Scenario: Secondary-stage surge protection on -48 V telecom rectifier outputs feeding base station RF amplifiers. IC Role / Device Role / Timing Role: Unidirectional TVS placed after primary MOV stage to refine clamping level and reduce let-through voltage. Use Value: Achieves 45.4 V clamping at 13.2 A, reducing stress on downstream DC/DC controllers rated for 50 V absolute maximum input. |
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/I | Same electrical specs but RoHS-compliant commercial grade (non-AEC-Q101, non-halogen-free) | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial only | Select when AEC-Q101 and halogen-free requirements are not mandated |
| SMAJ28A-HF | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 150 °C/W) | Reduced surge margin and thermal derating; requires tighter layout control for same power dissipation | Choose only if board space is constrained and surge energy is confirmed ≤400 mJ |
Compared with SMBJ28AHE3/I, the SMBJ28AHM3/I adds AEC-Q101 qualification and halogen-free compliance without altering clamping performance; versus SMAJ28A-HF, it provides 50 % higher surge power headroom and superior thermal management in identical PCB layouts.
Availability
SMBJ28AHM3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and factory automation I/O modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ28AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ28AHM3/I at its rated peak pulse current?
The SMBJ28AHM3/I has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) due to its low VBR temperature coefficient of 0.098 %/°C.
Is SMBJ28AHM3/I suitable for automotive applications?
Yes, SMBJ28AHM3/I is AEC-Q101 qualified and designated for automotive use via the HM3 suffix, confirming compliance with stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock. It is commonly deployed in body control modules, lighting drivers, and infotainment power supplies where 24 V system protection against load dump and ISO 7637-2 pulses is required. The SMBJ28AHM3/I's halogen-free construction further satisfies automotive material restrictions.
How does the SMBJ28AHM3/I differ from SMBJ28AHE3/I?
The SMBJ28AHM3/I and SMBJ28AHE3/I share identical electrical characteristics (VWM = 28 V, VBR = 31.1–34.4 V, VC = 45.4 V) and SMB package, but differ in qualification and materials: SMBJ28AHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified, while SMBJ28AHE3/I is RoHS-compliant commercial grade without automotive qualification or halogen-free status. Both meet MSL Level 1 and JESD201 Class 2 whisker resistance.
What is the maximum reverse leakage current of SMBJ28AHM3/I at its stand-off voltage?
At its 28 V stand-off voltage (VWM) and 25 °C ambient temperature, the SMBJ28AHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage ensures minimal power loss in always-on systems such as automotive wake-up circuits or industrial sensor nodes. Leakage remains below 5.0 µA up to 125 °C, supporting reliable operation in thermally demanding environments without compromising system quiescent current budgets.
Can SMBJ28AHM3/I be used in bidirectional configurations?
No, SMBJ28AHM3/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMBJ28CA) and lack polarity marking. Using SMBJ28AHM3/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to suppress. For AC-coupled or differential signal protection, select an explicitly bidirectional part from the same SMBJ family.
SMBJ28AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 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/I FAQ
1.How can I place an order for SMBJ28AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3/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 SMBJ28AHM3/I reliable?
The price and inventory of SMBJ28AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3/I?
SMBJ28AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3/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 SMBJ28AHM3/I?
For technical support, including SMBJ28AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3/I requirements.
6.How does Aetrix verify that SMBJ28AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3/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 SMBJ28AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3/I?
All SMBJ28AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3/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 SMBJ28AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ28AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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