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Vishay General Semiconductor - Diodes Division SMBJ28CHE3/52
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- Part No.:
- SMBJ28CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CHE3/52.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,340
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Product details
Overview
SMBJ28CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤45.4 V at 13.2 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMBJ28CHE3/52 datasheet, SMBJ28CHE3/52 pinout, SMBJ28CHE3/52 application, or SMBJ28CHE3/52 equivalent, this device is evaluated for high-reliability surge suppression in AEC-Q101-compliant systems requiring stable clamping, low leakage (<1.0 µA at VWM), and 600 W peak pulse power handling with minimal thermal resistance (RθJA = 100 °C/W).
Technical Context
This TVS diode operates as a unidirectional clamping device: reverse-biased during normal operation with <1.0 µA leakage at 28 V, then avalanche-conducting within nanoseconds when transient voltage exceeds its 31.1–34.4 V breakdown range. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low temperature coefficient (0.098 %/°C).
Designed for PCB-level protection against inductive switching spikes and ESD events, it delivers 600 W peak pulse power (10/1000 µs) with 45.4 V clamping voltage at 13.2 A, and supports repetitive surges at 0.01% duty cycle. The SMB package enables automated placement and meets MSL level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - defines reliable avalanche onset window for predictable clamping |
| VC @ IPPM | ≤45.4 V at 13.2 A - peak clamped voltage limiting stress on downstream ICs or MOSFETs |
| PPPM | 600 W - peak transient energy absorption capability under standardized 10/1000 µs waveform |
| IPPM | 13.2 A - maximum non-repetitive surge current the device safely conducts without failure |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for power derating above 25 °C |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band (cathode terminal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Avalanche conduction terminal | Connected to protected line (e.g., 28 V rail); band-marked end carries transient current into ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor protection |
| 600 W peak pulse power | Handles high-energy transients from load dump or inductive kick without degradation |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage across temperature and lifetime |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak, no moisture sensitivity concerns |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping, reducing risk to protected ICs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against ISO 7637-2 load dump pulses and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges within nanoseconds. Use Value: Limits voltage to ≤45.4 V during 13.2 A transients, preventing damage to downstream regulators and microcontrollers rated for 36 V max. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: TVS connected between signal line and ground, absorbing ESD and fast-rising noise from nearby motor drives. Use Value: Clamps 8 kV contact ESD per IEC 61000-4-2 to <45.4 V, preserving signal integrity and avoiding ADC saturation or latch-up. |
| Telecom DC Power Interface | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges on central office distribution boards. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at board entry point, shunting surge current to chassis ground. Use Value: Withstands 600 W peak pulses and maintains <1.0 µA leakage at -48 V, ensuring low standby power loss and long-term reliability. |
Use Scenario: Adding secondary overvoltage protection on VBUS line of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: TVS placed upstream of USB power delivery controller, triggered only during fault conditions beyond primary protection. Use Value: Provides fail-safe clamping at 45.4 V, preventing thermal runaway in PD controllers during sustained overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28AHE3/52 | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix notation (HE3 vs HE3/52 denotes tape-and-reel quantity code) | No functional difference; identical use in automotive and industrial designs | Select SMBJ28AHE3/52 if ordering via legacy part numbering or distributor stock referencing base HE3 variant |
| SMAJ28AHE3/A | Lower peak pulse power (400 W vs 600 W); same VWM, VBR, and VC; SMA (DO-214AC) package with smaller footprint and higher RθJA (140 °C/W) | Suitable for space-constrained consumer designs with lower surge threat levels; not recommended for automotive load dump | Choose SMAJ28AHE3/A only where board area is critical and surge energy remains below 400 W capability |
Compared with SMBJ28CHE3/52, SMBJ28AHE3/52 offers identical performance in a functionally interchangeable form, while SMAJ28AHE3/A trades 33% lower pulse power and higher thermal resistance for reduced PCB area - making SMBJ28CHE3/52 the preferred choice for AEC-Q101-compliant, high-energy surge environments.
Availability
SMBJ28CHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power distribution requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ28CHE3/52 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 diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 qualification are mandatory.
FAQ
What is the clamping voltage of SMBJ28CHE3/52 at its rated peak pulse current?
The SMBJ28CHE3/52 has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A under the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry downstream will not experience voltages exceeding 45.4 V during transient events - a critical parameter for safeguarding 36 V-rated components. The SMBJ28CHE3/52 achieves this with a clamping ratio of approximately 1.37 relative to its minimum VBR.
Is SMBJ28CHE3/52 qualified for automotive applications?
Yes, SMBJ28CHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101-qualified variants. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge robustness - making SMBJ28CHE3/52 suitable for under-hood and body-control module applications. The SMBJ28CHE3/52 meets all requirements for deployment in production automotive electronics.
What does the "/52" suffix mean in SMBJ28CHE3/52?
The "/52" suffix in SMBJ28CHE3/52 specifies the packaging format: 7-inch diameter plastic tape and reel containing 750 units. This is a standard logistics identifier defined in Vishay's ordering information table and does not affect electrical or thermal performance. The core device remains identical to SMBJ28AHE3 or SMBJ28CHE3 without the /52 suffix - only the reel size and quantity differ. SMBJ28CHE3/52 is fully interchangeable in design and layout with other HE3-suffixed variants.
How does SMBJ28CHE3/52 compare to bidirectional TVS diodes like SMBJ28CA?
SMBJ28CHE3/52 is unidirectional and intended for DC line protection where polarity is fixed (e.g., +28 V rail to ground), offering lower leakage (<1.0 µA at 28 V) and no reverse conduction during normal operation. In contrast, SMBJ28CA is bidirectional and used for AC or floating signal lines, exhibiting symmetrical clamping but higher leakage in both directions. The SMBJ28CHE3/52 cannot replace SMBJ28CA in AC-coupled applications without circuit redesign due to polarity dependence.
What is the thermal resistance and maximum junction temperature of SMBJ28CHE3/52?
The SMBJ28CHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" copper pads, and a maximum junction temperature (TJ) rating of +150 °C. This allows reliable operation in under-hood automotive environments and industrial enclosures with ambient temperatures up to +125 °C when power dissipation remains within derated limits. The SMBJ28CHE3/52's RθJA directly informs thermal design margins for sustained surge repetition rates.
SMBJ28CHE3/52 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ28CHE3/52 FAQ
1.How can I place an order for SMBJ28CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CHE3/52 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 SMBJ28CHE3/52 reliable?
The price and inventory of SMBJ28CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CHE3/52?
SMBJ28CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CHE3/52 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 SMBJ28CHE3/52?
For technical support, including SMBJ28CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CHE3/52 requirements.
6.How does Aetrix verify that SMBJ28CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28CHE3/52 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 SMBJ28CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28CHE3/52?
All SMBJ28CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CHE3/52, 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 SMBJ28CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ28CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CHE3/52 Tags
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