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Vishay General Semiconductor - Diodes Division SMBJ28-E3/52
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- Part No.:
- SMBJ28-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28-E3/52.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,536
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Product details
Overview
SMBJ28-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 on power rails and signal lines of industrial sensors and automotive ECUs.
For engineers reviewing the SMBJ28-E3/52 datasheet, SMBJ28-E3/52 pinout, SMBJ28-E3/52 application, or SMBJ28-E3/52 equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade qualification, and direct substitution guidance for circuit protection design.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 28 V, it enters avalanche breakdown to divert transient energy away from downstream ICs or MOSFETs. Its low incremental surge resistance and <1 ps response time ensure effective suppression of fast-rising ESD and switching spikes.
Thermal performance is defined by RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = 150 °C. The device is rated for repetitive 0.01% duty cycle pulses and meets J-STD-020 MSL Level 1 with 260 °C reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage during 10/1000 µs surge; limits stress on protected 3.3 V/5 V logic or gate drivers. |
| PPPM | 600 W - Peak pulse power handling capability defines transient energy absorption capacity per event. |
| IFSM | 100 A - Non-repetitive forward surge current rating supports robustness against accidental polarity reversal events. |
| TJ max. | 150 °C - Maximum junction temperature enables use in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and cathode band marking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant (E3 suffix), MSL Level 1, 260 °C reflow compatible. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or low-side return path; defines reference for clamping action. |
| Cathode | Avalanche conduction terminal / Transient sink | Connected to protected line (e.g., 24 V rail or CAN_H); conducts surge current to ground during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-event suppression of high-energy transients common in 24 V industrial control and automotive power distribution. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping, reducing risk of damage to downstream 3.3 V or 5 V interface ICs. |
| Glass passivated junction | Ensures stable leakage current (<1 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to SMT assembly, supporting standard reflow processes without yield loss. |
| RoHS-compliant, commercial grade (E3) | Meets global environmental compliance mandates while maintaining cost-effective supply for high-volume consumer and industrial designs. |
Applications
| Industrial Sensor Protection | Automotive Power Rail Clamp |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensor outputs and analog front-ends from inductive kickback and EFT bursts in factory automation. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and ground, clamping transients within nanoseconds. Use Value: Maintains signal integrity below 45.4 V during 13.2 A surges, preventing latch-up or damage to precision ADCs and op-amps. |
Use Scenario: Safeguarding 24 V power inputs of body control modules (BCMs) and lighting drivers against load-dump and jump-start events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, coordinated with upstream fuses and secondary filtering. Use Value: Absorbs 600 W transient energy without degradation, ensuring uninterrupted operation during ISO 7637-2 Pulse 5a events. |
| Telecom Line Interface | Consumer Power Adapter Input |
|
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from induced surges on outdoor cabling in building management systems. IC Role / Device Role / Timing Role: Secondary-level protection after gas discharge tube (GDT), limiting let-through voltage to safe levels. Use Value: Clamps to ≤45.4 V within <1 ps, preserving signal timing margins and preventing data corruption on differential buses. |
Use Scenario: Guarding AC-DC adapter primary-side rectifier outputs and DC bus nodes against mains-borne surges and capacitor discharge spikes. IC Role / Device Role / Timing Role: Fast-response shunt element across bulk capacitor, suppressing voltage spikes before they reach PWM controllers. Use Value: Withstands 100 A non-repetitive forward surge, surviving accidental reverse-polarity connection during service. |
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 | Same electrical specs and package; identical marking code "MG" and VBR range (31.1–34.4 V). | No functional difference; alternate ordering format without dash in part number. | Select based on distributor stock availability or internal BOM naming convention. |
| SAC28 | Lower PPPM = 400 W, higher VC = 48.4 V at 8.3 A, same VWM = 28 V, but in smaller SOD-123 package. | Less robust for high-energy transients; suitable only where board space constraints outweigh surge margin needs. | Choose SAC28 only if PCB area is critical and worst-case surge energy remains below 400 W. |
Compared with SMBJ28-E3/52, SMBJ28A-E3/52 offers identical protection performance with no design change required, while SAC28 trades 33% lower pulse power and higher clamping for 40% smaller footprint - making SMBJ28-E3/52 the preferred choice for industrial and automotive applications demanding full 600 W margin.
Availability
SMBJ28-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive power rail protection, and telecom line conditioning requiring stable component supply, consistent RoHS compliance, and traceable manufacturing origin.
Supply support for SMBJ28-E3/52 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 optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, repeatable clamping, and AEC-Q101 readiness are essential.
FAQ
What is the breakdown voltage range of SMBJ28-E3/52?
The SMBJ28-E3/52 has a guaranteed breakdown voltage (VBR) range of 31.1 V to 34.4 V at test current IT = 1 mA, measured per ANSI/IEEE C62.35 standards. This range ensures consistent avalanche initiation across production lots and supports precise coordination with downstream overvoltage thresholds in 24 V systems. The SMBJ28-E3/52 maintains this specification under TA = 25 °C and conforms to Vishay's published Document Number 88392.
Does SMBJ28-E3/52 meet automotive qualification standards?
The SMBJ28-E3/52 is RoHS-compliant commercial-grade and not AEC-Q101 qualified; its automotive ordering variant is SMBJ28HE3_X (e.g., SMBJ28HE3_B). While SMBJ28-E3/52 shares identical electrical characteristics and SMB package, it lacks the extended temperature cycling, HTRB, and ESD validation required for automotive under-hood use. For automotive applications, SMBJ28-E3/52 must be replaced with the HE3-suffixed version.
What is the maximum clamping voltage of SMBJ28-E3/52 at rated surge current?
The SMBJ28-E3/52 exhibits a maximum clamping voltage (VC) of 45.4 V at peak pulse current (IPPM) = 13.2 A, tested with a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is validated per Figure 1 and Table 1 in Vishay Document 88392. Designers use this parameter to verify margin against absolute maximum ratings of downstream components.
Can SMBJ28-E3/52 be used in bidirectional configurations?
No - SMBJ28-E3/52 is a unidirectional TVS diode, identified by cathode band marking and specified only for reverse-biased operation. Bidirectional variants use the "CA" suffix (e.g., SMBJ28CA), which feature symmetrical breakdown in both polarities. Using SMBJ28-E3/52 in bidirectional circuits risks failure during positive-going transients, as it conducts only in reverse direction and blocks forward surges above ~3.5 V.
What is the thermal resistance from junction to ambient for SMBJ28-E3/52?
The SMBJ28-E3/52 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 Vishay Document 88392. This value governs steady-state temperature rise under DC power dissipation and informs layout decisions for thermal relief, pad size, and airflow requirements in enclosed enclosures.
SMBJ28-E3/52 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28-E3/52 FAQ
1.How can I place an order for SMBJ28-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28-E3/52 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 SMBJ28-E3/52 reliable?
The price and inventory of SMBJ28-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28-E3/52?
SMBJ28-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28-E3/52 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 SMBJ28-E3/52?
For technical support, including SMBJ28-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28-E3/52 requirements.
6.How does Aetrix verify that SMBJ28-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28-E3/52 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 SMBJ28-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28-E3/52?
All SMBJ28-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28-E3/52, 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 SMBJ28-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ28-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28-E3/52 Tags
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