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Vishay General Semiconductor - Diodes Division SMBJ28A-E3/52
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- Part No.:
- SMBJ28A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28A-E3/52.pdf
- Description:
- TVS DIODE 28VWM 45.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:13,835
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Product details
Overview
SMBJ28A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown range at 1 mA, clamps transients to ≤45.4 V at 13.2 A peak pulse current (10/1000 µs), and delivers 600 W peak pulse power - deployed in automotive power modules, industrial motor drives, and telecom DC input stages.
For engineers reviewing the SMBJ28A-E3/52 datasheet, SMBJ28A-E3/52 pinout, SMBJ28A-E3/52 application, or SMBJ28A-E3/52 equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), and compliance with UL 497B for surge protector classification.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 10/1000 µs waveform rating reflects standardized lightning/surge immunity testing per ANSI/IEEE C62.35.
Thermal design relies on PCB copper pad area (0.2" × 0.2") to sustain 5.0 W steady-state dissipation at TA = 50 °C. The cathode band marking identifies polarity, and MSL Level 1 handling supports lead-free reflow up to 260 °C peak per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT = 1 mA | 31.1–34.4 V - guaranteed breakdown range defining reliable turn-on threshold |
| VC @ IPPM = 13.2 A | ≤45.4 V - clamped voltage during 600 W transient, limiting stress on downstream ICs |
| IPPM | 13.2 A - peak surge current capability under 10/1000 µs waveform (duty cycle 0.01 %) |
| PPPM | 600 W - standardized surge power rating enabling comparison across TVS families |
| Junction Temp. Range | −55 °C to +150 °C - supports operation in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - 2-pin surface-mount outline with 5.59 mm max length and 2.20 mm max height |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, RoHS-compliant (E3 suffix), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Avalanche conduction terminal / high-side connection | Marked with band; connects to protected line (e.g., 24 V supply rail) to shunt surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without derating |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage overshoot during fast transients, preserving MOSFET gate oxide integrity |
| Glass passivated junction | Ensures stable VBR tolerance and <1.0 µA leakage at VWM, critical for low-power sensor interfaces |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring validated reliability (e.g., body control modules) |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: 24 V battery-fed ECU power rail exposed to load dump (ISO 16750-2) and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp surges above 34 V before reaching DC-DC converter input. Use Value: Limits peak voltage to ≤45.4 V at 13.2 A, preventing damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: 24 V digital input channel in programmable logic controller subject to field-wiring induced inductive spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on each optocoupler input line to absorb >1 kV transients before signal conditioning circuitry. Use Value: Sub-1 ns response time and low dynamic impedance ensure clamping occurs within first 100 ns of surge onset. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Boards |
|
Use Scenario: −48 V DC power input in base station equipment encountering lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Paired unidirectional SMBJ28A-E3/52 devices (anode-to-rail, cathode-to-GND) protect rectifier output and upstream converters. Use Value: 600 W rating sustains repeated 10/1000 µs surges per GR-1089-CORE, supporting 20-year field life. |
Use Scenario: 24 V control rail in smart washing machine main board exposed to relay coil flyback and brush-commutator noise. IC Role / Device Role / Timing Role: TVS mounted directly at microcontroller power pins to suppress sub-µs switching spikes from H-bridge drivers. Use Value: Low incremental surge resistance (<0.8 Ω typical) minimizes VC rise during high-di/dt 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 |
|---|---|---|---|
| SMBJ28CA-E3/52 | Bidirectional variant; symmetric VBR (31.1–34.4 V) in both polarities; no polarity marking | Required for AC-coupled or floating signal lines where reverse polarity surges occur (e.g., RS-485 bus) | Select only if bidirectional clamping is mandated; otherwise unidirectional SMBJ28A-E3/52 offers lower leakage and simpler layout |
| SMAJ28A-E3/52 | Lower 400 W PPPM; same VWM/VBR but higher VC (≤49.9 V at 8.8 A); SMA (DO-214AC) package (smaller footprint) | Suitable for space-constrained consumer electronics with lower surge threat levels (IEC 61000-4-5 Level 2) | Use when board area is critical and 600 W rating is unnecessary; verify thermal margin given higher RθJA (~140 °C/W) |
Compared with SMBJ28CA-E3/52 and SMAJ28A-E3/52, the SMBJ28A-E3/52 provides optimal balance of high-energy clamping (600 W), low-profile SMB packaging, and unidirectional precision for DC power rail protection - making it preferred for automotive and industrial 24 V systems where polarity is fixed and surge severity is high.
Availability
SMBJ28A-E3/52 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power supplies, and appliance motor controllers requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ28A-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 MOSFETs with emphasis on reliability, power efficiency, and AEC-Q qualified solutions.
The SMBJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability are non-negotiable.
FAQ
What is the maximum clamping voltage of SMBJ28A-E3/52 under surge conditions?
The SMBJ28A-E3/52 clamps to a maximum of 45.4 V when subjected to its rated peak pulse current of 13.2 A (10/1000 µs waveform). This value is measured at the device terminals under standard test conditions (mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure downstream components tolerate this clamped voltage with margin.
Is SMBJ28A-E3/52 RoHS-compliant and halogen-free?
Yes, SMBJ28A-E3/52 carries the "E3" suffix, indicating it is RoHS-compliant per EU Directive 2011/65/EU and meets Vishay's commercial-grade material specifications. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (SMBJ28A-M3/52) must be selected, which also maintains RoHS compliance and JESD 201 Class 2 whisker resistance.
Can SMBJ28A-E3/52 be used in automotive applications?
SMBJ28A-E3/52 itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under the HE3 (RoHS-compliant, AEC-Q101) and HM3 (halogen-free, RoHS-compliant, AEC-Q101) suffixes. For automotive use, specify SMBJ28AHE3_B/H or SMBJ28AHM3_B/H - these undergo stress testing per AEC-Q101 and are approved for under-hood and chassis-mounted modules.
What is the thermal resistance of SMBJ28A-E3/52, and how does it affect layout?
The SMBJ28A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperature under 5.0 W steady-state dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks - insufficient copper raises RθJA, risking thermal runaway during sustained overvoltage.
How does SMBJ28A-E3/52 differ from SMBJ28CA-E3/52?
SMBJ28A-E3/52 is unidirectional with cathode band marking and specified parameters only for reverse-biased operation, while SMBJ28CA-E3/52 is bidirectional - identical in VBR, VWM, and PPPM, but functional in both polarities with no polarity marking. Use SMBJ28A-E3/52 for DC rails with defined polarity; choose SMBJ28CA-E3/52 only when AC signals or reversible connections require symmetrical clamping.
SMBJ28A-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:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28A-E3/52 FAQ
1.How can I place an order for SMBJ28A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28A-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 SMBJ28A-E3/52 reliable?
The price and inventory of SMBJ28A-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 SMBJ28A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ28A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28A-E3/52?
SMBJ28A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28A-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 SMBJ28A-E3/52?
For technical support, including SMBJ28A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28A-E3/52 requirements.
6.How does Aetrix verify that SMBJ28A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ28A-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 SMBJ28A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ28A-E3/52?
All SMBJ28A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28A-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 SMBJ28A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ28A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28A-E3/52 Tags
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