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Vishay General Semiconductor - Diodes Division SMBJ28HE3/52
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- Part No.:
- SMBJ28HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28HE3/52.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,733
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Product details
Overview
SMBJ28HE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) 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 13.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMBJ28HE3/52 datasheet, SMBJ28HE3/52 pinout, SMBJ28HE3/52 application, or SMBJ28HE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, low 1.0 µA max reverse leakage at VWM, 150 °C max junction temperature, and compatibility with automated SMT assembly on standard PCB pad layouts per JEDEC DO-214AA footprint.
Technical Context
The SMBJ28HE3/52 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified VBR range (31.1–34.4 V), thereby clamping transients to ≤45.4 V at 13.2 A. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance under repetitive surge stress.
Designed for high-reliability environments, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports 100 A non-repetitive forward surge (8.3 ms half-sine), and delivers thermal resistance of 100 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads - enabling effective heat dissipation without heatsinking in most board-level deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 24 V systems. |
| VBR @ IT = 1 mA | 31.1–34.4 V - Verified breakdown threshold ensuring predictable turn-on during fast transients (e.g., ISO 7637-2 pulse 1/2a). |
| VC @ IPPM = 13.2 A | 45.4 V - Clamped voltage under 600 W 10/1000 µs surge; limits downstream IC stress to <46 V during ESD/EFT events. |
| IPPM | 13.2 A - Peak surge current capability with 0.01% duty cycle; sufficient for automotive load-dump suppression per ISO 16750-2. |
| PPPM | 600 W - Peak pulse power handling with standardized 10/1000 µs waveform; enables single-device protection for mid-power rails. |
| TJmax | +150 °C - Maximum junction temperature supporting operation in under-hood or industrial enclosures without derating. |
| RθJA | 100 °C/W - Thermal resistance on minimal pad layout; allows thermal design validation using standard IPC-2221 copper area rules. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Cathode indicated by band marking on case body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to system ground or low-side return path; establishes reference for clamping action. |
| Cathode | Transient voltage clamp output | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 600 W peak pulse power (10/1000 µs) | Withstands severe load-dump and inductive switching surges without degradation in automotive 24 V systems. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
| Low 1.0 µA max ID @ VWM | Minimizes standby power loss and avoids false triggering in low-current sensor or microcontroller supply rails. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs against ISO 16750-2 load-dump pulses (up to 35 V, 400 ms) and ISO 7637-2 coupled transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V input and chassis ground, clamping surges within 1 ns response time. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤45.4 V, preventing latch-up or permanent damage. |
Use Scenario: Safeguarding analog inputs of PLC I/O modules connected to 4–20 mA current loops exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across signal and ground pins of isolated ADC front-end, absorbing EFT bursts up to 4 kV. Use Value: Maintains signal integrity below 1.0 µA leakage at 24 V, avoiding offset errors while surviving repeated 600 W surges. |
| Telecom DC Power Input Protection | Motor Drive Control Signal Protection |
|
Use Scenario: Securing -48 V DC input of base station power supplies against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS configured cathode-to-rail, leveraging 28 V VWM to avoid conduction during normal negative bias operation. Use Value: Clamps negative-going transients to ≤45.4 V magnitude, preserving rectifier bridge and upstream fuse integrity. |
Use Scenario: Shielding gate driver enable signals in BLDC motor inverters from cross-talk and inductive kickback from high-side FET switching. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across logic-level control lines (e.g., EN, PWM) referenced to local ground plane. Use Value: Provides sub-1 ns response with no signal distortion due to <100 pF typical junction capacitance at zero bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-E3/52 | Commercial-grade (non-AEC-Q101), identical electrical specs and SMB package. | Lacks automotive qualification; suitable for industrial/commercial power supplies where AEC compliance is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and lifecycle traceability is not required. |
| SMAJ28AHE3/A | Lower 400 W PPPM, SMA (DO-214AC) package, same VWM/VBR but higher VC (49.9 V @ 8.3 A). | Reduced surge margin; limited to lower-energy transients in space-constrained designs where SMB footprint is unavailable. | Choose only if board real estate prohibits SMB and surge energy remains below 400 W; verify clamping margin with system-level testing. |
Compared with SMBJ28A-E3/52, the SMBJ28HE3/52 adds AEC-Q101 qualification and enhanced process controls for automotive use; versus SMAJ28AHE3/A, it delivers 50% higher surge power handling and tighter clamping in the same functional voltage class - making it the preferred choice for mission-critical 24 V rail protection.
Availability
SMBJ28HE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply with full AEC-Q101 traceability and extended temperature support.
Supply support for SMBJ28HE3/52 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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting automotive power distribution, industrial automation I/O protection, and telecom infrastructure - with AEC-Q101 variants like SMBJ28HE3/52 fulfilling stringent automotive qualification requirements.
FAQ
What is the clamping voltage of SMBJ28HE3/52 at its rated peak pulse current?
The SMBJ28HE3/52 has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured with a 10/1000 µs waveform. This value ensures protected circuits remain below critical voltage thresholds during surge events. The SMBJ28HE3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) and is validated per AEC-Q101 stress test conditions.
Is SMBJ28HE3/52 suitable for automotive applications?
Yes, SMBJ28HE3/52 is AEC-Q101 qualified and specifically designed for automotive use, including engine control modules, body electronics, and ADAS sensor power rails. Its HE3 suffix denotes RoHS-compliant construction with automotive-grade process controls, extended temperature operation up to +150 °C, and qualification for mechanical shock, temperature cycling, and humidity testing per AEC standards. The SMBJ28HE3/52 meets these requirements without derating in typical under-hood environments.
What is the reverse leakage current specification for SMBJ28HE3/52 at its stand-off voltage?
The SMBJ28HE3/52 specifies a maximum reverse leakage current (ID) of 1.0 µA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage minimizes standby power loss and prevents interference in precision analog or low-current digital circuits. The SMBJ28HE3/52 maintains leakage below 5.0 µA even at +125 °C, supporting reliable operation in thermally demanding applications.
Does SMBJ28HE3/52 have a bidirectional variant?
No, SMBJ28HE3/52 is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., SMBJ28CA), which provide symmetrical clamping for AC or floating signal lines. The SMBJ28HE3/52 is optimized for DC rail protection where polarity is fixed, offering tighter VBR tolerance and lower VC than its bidirectional counterparts at equivalent power ratings.
What package type does SMBJ28HE3/52 use, and is it compatible with standard SMT processes?
SMBJ28HE3/52 uses the SMB (DO-214AA) surface-mount package with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. It is rated MSL Level 1 (260 °C peak reflow), making it fully compatible with standard lead-free reflow profiles without pre-baking. The SMBJ28HE3/52's footprint matches JEDEC DO-214AA mechanical dimensions and supports automated pick-and-place assembly in high-volume manufacturing.
SMBJ28HE3/52 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:
- 50V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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)
SMBJ28HE3/52 FAQ
1.How can I place an order for SMBJ28HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28HE3/52 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 SMBJ28HE3/52 reliable?
The price and inventory of SMBJ28HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28HE3/52?
SMBJ28HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28HE3/52 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 SMBJ28HE3/52?
For technical support, including SMBJ28HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28HE3/52 requirements.
6.How does Aetrix verify that SMBJ28HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28HE3/52 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 SMBJ28HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28HE3/52?
All SMBJ28HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28HE3/52, 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 SMBJ28HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ28HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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