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Vishay General Semiconductor - Diodes Division SMBJ28AHE3_A/I
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- Part No.:
- SMBJ28AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AHE3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,320
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Product details
Overview
SMBJ28AHE3_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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMBJ28AHE3_A/I datasheet, SMBJ28AHE3_A/I pinout, SMBJ28AHE3_A/I application, or SMBJ28AHE3_A/I equivalent, this page delivers verified electrical specs, thermal derating behavior, clamping performance under surge conditions, AEC-Q101 qualification status, and direct replacement guidance for board-level ESD and lightning transient protection design.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp with glass-passivated junction, optimized for fast response (<1 ns) to transient overvoltages. Its low incremental surge resistance (typical <0.5 Ω) ensures minimal voltage overshoot during 10/1000 µs surges up to 13.2 A, while maintaining stable clamping at 45.4 V.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 31.1–34.4 V at IT = 1 mA - Voltage at which device enters avalanche conduction; tight tolerance enables predictable turn-on timing. |
| VC (Clamping Voltage) | 45.4 V at IPPM = 13.2 A - Maximum voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Surge energy handling capacity; validates robustness against IEC 61000-4-5 Level 3/4 transients. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Low leakage preserves system efficiency and prevents false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) without degradation. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS subsystems requiring long-term field stability. |
| Glass passivated chip junction | Ensures consistent avalanche characteristics and long-term parameter stability across temperature and life cycles. |
| Low profile SMB package | Enables automated placement in space-constrained PCB layouts while maintaining thermal performance via standard pad design. |
| 13.2 A IPPM at 45.4 V VC | Delivers low clamping ratio (VC/VWM ≈ 1.62), minimizing stress on downstream 30 V-rated MOSFETs and logic ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery rail in engine control unit exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits transient spikes to ≤45.4 V, protecting 40 V input-rated buck controller and preventing brownout-induced firmware resets. |
Use Scenario: RS-485 communication line in factory automation PLC connected to remote temperature sensors. IC Role / Device Role / Timing Role: Line-side TVS on differential pair to suppress EFT bursts and induced surges. Use Value: Clamps common-mode transients within 1 ns, preserving signal integrity and avoiding receiver latch-up during 4 kV contact discharge. |
| Consumer Power Adapter Output Protection | MOSFET Gate Driver Protection |
|
Use Scenario: 24 V output of wall-mounted AC/DC adapter powering smart home hub. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated output to absorb coupling noise from primary-side switching. Use Value: Prevents overvoltage damage to USB-PD controller and microcontroller I/O pins during fast transient events. |
Use Scenario: High-side N-channel MOSFET gate drive path in motor driver half-bridge. IC Role / Device Role / Timing Role: TVS placed between gate and source to suppress Miller-induced voltage spikes during switching transitions. Use Value: Limits gate-source voltage to ≤45.4 V, avoiding oxide breakdown in 30 V-rated MOSFETs during 100 ns dV/dt events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHM3_A/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and thermal performance. | No functional difference; selected where halogen-free compliance is mandated by OEM or regional environmental regulations. | Direct material substitution when halogen-free BOM requirement applies; no layout or validation change needed. |
| SMCJ28AHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher RθJA (65 °C/W) and 1500 W PPPM rating. | Better suited for higher-energy surges (>1 kV IEC 61000-4-5) or systems with limited airflow; requires larger PCB footprint. | Choose when surge energy exceeds 600 W capability or thermal margin is insufficient with SMB layout; verify pad thermal relief. |
Compared with SMBJ28AHE3_A/I, the HM3 variant offers identical protection performance with halogen-free compliance, while the SMCJ28AHE3_A/I provides higher surge energy handling at the cost of increased board area and altered thermal management requirements.
Availability
SMBJ28AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer power adapter output safeguarding requiring stable component supply and AEC-Q101 traceability.
Supply support for SMBJ28AHE3_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, automotive qualification, and high-volume manufacturability.
The SMBJ series is engineered for robust transient suppression in harsh environments-designed specifically for automotive, industrial, and telecom applications demanding AEC-Q101 compliance, low clamping voltage, and repeatable surge performance.
FAQ
What is the clamping voltage of SMBJ28AHE3_A/I at its rated peak pulse current?
The SMBJ28AHE3_A/I has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and confirms effective protection for 30 V-rated downstream components. The SMBJ28AHE3_A/I maintains this clamping performance with low incremental resistance, ensuring minimal voltage overshoot during fast transients.
Is SMBJ28AHE3_A/I qualified for automotive applications?
Yes, SMBJ28AHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in Vishay's ordering information and thermal characteristics notes. It undergoes stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT) to ensure reliability in automotive under-hood and cabin environments. The SMBJ28AHE3_A/I is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces.
How does the SMBJ28AHE3_A/I differ from bidirectional variants like SMBJ28CA?
The SMBJ28AHE3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMBJ28CA is bidirectional, symmetrical in both directions, and used for AC or differential signal lines. Electrical differences include forward voltage drop (VF ≤ 3.5 V at 50 A for SMBJ28AHE3_A/I, not specified for CA), and reverse leakage ID is tested only at VWM for unidirectional types. The SMBJ28AHE3_A/I cannot replace SMBJ28CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of SMBJ28AHE3_A/I, and how does it affect PCB layout?
The SMBJ28AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Vishay datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and risks exceeding TJ max. of +150 °C during repetitive surges. For SMBJ28AHE3_A/I, maintain full copper coverage under both terminals and avoid thermal reliefs to sustain power dissipation capability.
Can SMBJ28AHE3_A/I be used in place of SMBJ30AHE3_A/I?
No-SMBJ28AHE3_A/I and SMBJ30AHE3_A/I have different stand-off voltages (28 V vs. 30 V) and breakdown ranges (31.1–34.4 V vs. 33.3–36.8 V), resulting in distinct clamping behaviors. Substituting SMBJ28AHE3_A/I for SMBJ30AHE3_A/I may cause premature conduction in 30 V nominal systems, increasing leakage and self-heating. The SMBJ28AHE3_A/I is not a drop-in replacement; selection must match system VWM margin and transient amplitude requirements per IEC or ISO standards.
SMBJ28AHE3_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:
- 45.5V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28AHE3_A/I FAQ
1.How can I place an order for SMBJ28AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AHE3_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 SMBJ28AHE3_A/I reliable?
The price and inventory of SMBJ28AHE3_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 SMBJ28AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ28AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AHE3_A/I?
SMBJ28AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AHE3_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 SMBJ28AHE3_A/I?
For technical support, including SMBJ28AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ28AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28AHE3_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 SMBJ28AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ28AHE3_A/I?
All SMBJ28AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AHE3_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 SMBJ28AHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ28AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28AHE3_A/I Tags
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