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Vishay General Semiconductor - Diodes Division SMBJ28AHM3_A/I
- Part No.:
- SMBJ28AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ28AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power 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 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 power supplies.
For engineers reviewing the SMBJ28AHM3_A/I datasheet, SMBJ28AHM3_A/I pinout, SMBJ28AHM3_A/I application, or SMBJ28AHM3_A/I equivalent, this device is selected for robust ESD and surge protection where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification (via HM3 suffix) are required in automotive body electronics and industrial control I/O stages.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only in reverse bias above VBR while blocking up to 28 V in normal operation. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable breakdown behavior across temperature (−55 °C to +150 °C).
The SMBJ28AHM3_A/I uses a single P-N junction structure with cathode-band polarity marking, optimized for automated placement on PCBs with 0.2" × 0.2" copper pads per terminal. Its thermal resistance (RθJA = 100 °C/W) and 5.0 W steady-state power dissipation support continuous operation in ambient temperatures up to 50 °C with appropriate layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum DC or RMS voltage the device blocks during normal operation without clamping. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range defining reliable turn-on threshold under transient stress. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage seen by protected circuit during 600 W, 10/1000 µs surge event. |
| PPPM | 600 W - Peak transient power handling capability per single 10/1000 µs pulse, duty cycle ≤ 0.01 %. |
| ID @ VWM | ≤1.0 µA - Reverse leakage ensuring minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature enabling use in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height, MSL Level 1 compliant. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, RoHS-compliant and halogen-free (HM3 suffix), MSL Level 1, peak reflow temperature 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; enables unidirectional clamping when cathode is biased higher. |
| Cathode | Reverse-bias clamping terminal | Marked with band; connected to higher-potential rail (e.g., VCC or signal line); conducts avalanche current during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and sensor interfaces requiring reliability under thermal cycling and vibration. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 12 V/24 V systems without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio suppressors, preserving margin for 3.3 V/5 V logic rails. |
| Fast response time (<1 ns) | Clamps transients before sensitive components experience damaging voltage overshoot, critical for CAN/LIN bus and microcontroller I/O protection. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive OEM material compliance requirements and supports lead-free assembly processes without whisker risk (JESD 201 Class 2). |
Applications
| Automotive Body Electronics | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from load dump and inductive switching spikes in 12 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, clamping negative transients and positive spikes exceeding 28 V. Use Value: Limits voltage to ≤45.4 V during 13.2 A surge, preventing latch-up or gate oxide damage in 3.3 V transceivers while maintaining signal integrity below VWM. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges from solenoid coils and motor drives. IC Role / Device Role / Timing Role: Mounted at connector entry point, shunting transient energy to chassis ground before it reaches optocoupler or MCU GPIO pins. Use Value: Enables reliable operation under IEC 61000-4-4 EFT (4 kV) and IEC 61000-4-5 surge (2 kV) tests without external series impedance or timing delays. |
| DC Power Supply Rail Protection | Automotive Sensor Signal Lines |
|
Use Scenario: Guarding 24 V auxiliary power rails in telematics units against battery reverse connection and alternator load dump events. IC Role / Device Role / Timing Role: Placed in parallel with bulk capacitor, clamping voltage rise during 100 A, 8.3 ms half-sine surge (IFSM = 100 A). Use Value: Absorbs 600 W peak energy without failure, limiting rail voltage to safe levels for downstream DC-DC converters rated to 48 V absolute maximum. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in engine compartments from ESD and ignition noise coupling. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-sensor output line, suppressing fast transients while adding <1 pF capacitance (typical). Use Value: Maintains signal fidelity with <1.0 µA leakage at 28 V, avoiding DC offset errors in ratiometric 0–5 V sensor outputs. |
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_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for non-automotive industrial or consumer designs. | Select when AEC-Q101 and halogen-free requirements are not mandated, prioritizing cost-sensitive volume production. |
| SMAJ28A-HF | Lower 400 W PPPM, SMA package (smaller footprint), VC = 46.6 V at 9.4 A, no AEC-Q101 option. | Reduced surge capacity and smaller thermal mass limit use to low-energy signal-line protection only. | Choose only for space-constrained PCBs where 400 W surge immunity suffices and automotive qualification is unnecessary. |
Compared with SMBJ28AHM3_A/I, the E3 variant trades automotive qualification for broader commercial availability, while the SMAJ28A-HF sacrifices 33 % peak power and thermal robustness for footprint reduction - making SMBJ28AHM3_A/I the optimal choice for AEC-Q101–mandated 24 V system protection.
Availability
SMBJ28AHM3_A/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and 24 V DC power supply rail protection requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ28AHM3_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, rectifiers, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMBJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, balancing clamping performance, thermal robustness, and surface-mount manufacturability in the SMB package.
FAQ
What is the maximum clamping voltage of SMBJ28AHM3_A/I under a 10/1000 µs surge?
The SMBJ28AHM3_A/I has a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current of 13.2 A using the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ28AHM3_A/I maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C), ensuring consistent protection in harsh environments.
Is SMBJ28AHM3_A/I suitable for automotive applications?
Yes, SMBJ28AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It is explicitly designed for automotive use cases including body electronics, sensor interfaces, and infotainment power rails. The SMBJ28AHM3_A/I undergoes stress testing for temperature cycling, mechanical shock, and humidity resistance per AEC-Q101 requirements, making it appropriate for under-hood and cabin-mounted modules where reliability is critical.
What does the "_A/I" suffix mean in SMBJ28AHM3_A/I?
The "_A/I" suffix in SMBJ28AHM3_A/I denotes packaging and reel configuration: "A" indicates revision code A per Vishay's ordering nomenclature, and "I" specifies 13-inch diameter plastic tape and reel with 3200 units per reel. This format aligns with Vishay's standard delivery mode for high-volume SMT assembly. The SMBJ28AHM3_A/I is supplied in this configuration to support automated pick-and-place operations without manual handling or repackaging.
How does SMBJ28AHM3_A/I compare to bidirectional TVS diodes like SMBJ28CA?
The SMBJ28AHM3_A/I is unidirectional and intended for DC-biased lines where only one polarity of overvoltage must be suppressed - such as positive supply rails or signal lines referenced to ground. In contrast, SMBJ28CA is bidirectional and suited for AC-coupled or floating lines like data buses. Using SMBJ28AHM3_A/I in place of SMBJ28CA on a bidirectional path would fail to clamp negative transients, so selection must match circuit polarity requirements. The SMBJ28AHM3_A/I offers identical VWM and PPPM but differs fundamentally in conduction symmetry.
What is the thermal resistance and power derating behavior of SMBJ28AHM3_A/I?
The SMBJ28AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. Its steady-state power dissipation (PD) is rated at 5.0 W at 50 °C ambient, derating linearly to zero at +150 °C junction temperature. Pulse power (600 W) is limited by duty cycle (≤0.01 %) and initial junction temperature, per Figure 2 in the Vishay datasheet 88392. This derating profile ensures safe operation in thermally constrained enclosures when layout guidelines are followed.
SMBJ28AHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ28AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHM3_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 SMBJ28AHM3_A/I reliable?
The price and inventory of SMBJ28AHM3_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 SMBJ28AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ28AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHM3_A/I?
SMBJ28AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHM3_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 SMBJ28AHM3_A/I?
For technical support, including SMBJ28AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ28AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHM3_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 SMBJ28AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ28AHM3_A/I?
All SMBJ28AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHM3_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 SMBJ28AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ28AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHM3_A/I Tags
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