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Vishay General Semiconductor - Diodes Division SMBJ28CA-M3/5B
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- Part No.:
- SMBJ28CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CA-M3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,741
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Product details
Overview
SMBJ28CA-M3/5B from Vishay General Semiconductor is a bidirectional 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, 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 in industrial sensor interfaces.
For engineers reviewing the SMBJ28CA-M3/5B datasheet, SMBJ28CA-M3/5B pinout, SMBJ28CA-M3/5B application, or SMBJ28CA-M3/5B equivalent, this device is selected for bidirectional surge suppression where low clamping ratio, fast response (<1 ns), and AEC-Q101-qualified variants (HM3 suffix) are critical - especially in automotive body control modules, industrial I/O protection, and telecom line interface circuits.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in either direction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable clamping performance under repetitive transients.
The device uses a planar silicon avalanche structure optimized for low incremental surge resistance (rd) and minimal thermal runaway risk. With a 100 °C/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature, it sustains transient energy dissipation without derating up to 75 °C ambient when mounted per recommended 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe working margin below clamping threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensuring reliable triggering across process variation and temperature. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamping voltage during 10/1000 µs surge; limits downstream voltage stress to ≤45.4 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling capability with 0.01% duty cycle; supports repeated ESD and lightning-induced surges. |
| IPPM | 13.2 A - Peak pulse current corresponding to VC; validates surge current capacity for IEC 61000-4-5 Level 3 (1 Ω/2 Ω source impedance). |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.21 mm × 4.57 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band or polarity designation required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (e.g., 4 kV/2 Ω) without degradation when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and consumer end equipment without compromising surge robustness. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) from inductive switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt surge energy before reaching precision DAC or op-amp circuitry. Use Value: Limits induced voltage to ≤45.4 V during 1 kV/500 A surge events, preserving signal integrity and preventing latch-up in downstream analog front-end ICs. |
Use Scenario: Safeguarding LIN bus transceiver I/O pins against load dump and jump-start transients in door module ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line, operating within 27–30 V system range while clamping spikes above 45 V. Use Value: Maintains LIN communication continuity by suppressing >100 V transients to safe levels within <1 ns, meeting ISO 16750-2 pulse 5a requirements. |
| Telecom Line Interface | Power Supply Input Protection |
|
Use Scenario: Shielding Ethernet PHY magnetics secondary side from ESD and lightning-induced common-mode surges in PoE-powered access points. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pair (e.g., TX+/TX−) to clamp mode-common transients without distorting signal symmetry. Use Value: Prevents PHY IC damage by limiting surge voltage to 45.4 V while maintaining <0.5 pF junction capacitance - avoiding signal integrity loss at 100 Mbps. |
Use Scenario: Secondary-side overvoltage protection on 24 V DC input rail of industrial HMIs after DC/DC converter output. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between +24 V and GND to absorb coupling transients from adjacent motor drives or relay coils. Use Value: Absorbs 600 W surge energy without failure, sustaining system uptime during frequent 24 V rail disturbances in factory-floor environments. |
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-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3); tin-lead solder compatibility retained. | Suitable for commercial-grade systems where halogen-free mandate is absent; less stringent environmental compliance. | Select when cost-sensitive commercial designs require full RoHS but not halogen-free certification. |
| SMBJ28CAHM3_B/I | AEC-Q101 qualified; identical VWM, VBR, VC, and PPPM; same M3 halogen-free construction plus automotive reliability validation. | Required for automotive applications subject to AEC-Q101 qualification; supports extended temperature cycling and HTOL testing. | Choose for automotive body electronics, infotainment, or ADAS subsystems requiring certified component reliability. |
Compared with SMBJ28CA-M3/5B, the E3 variant offers lower-cost RoHS compliance without halogen-free assurance, while the HM3 variant adds AEC-Q101 qualification for automotive use - neither is pin-compatible in the sense of guaranteed drop-in replacement without design review, but all share identical SMB package and bidirectional electrical behavior.
Availability
SMBJ28CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line protection, and 24 V DC power supply input protection requiring stable component supply and halogen-free compliance.
Supply support for SMBJ28CA-M3/5B 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMBJ28CA-M3/5B at its rated peak pulse current?
The SMBJ28CA-M3/5B has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value ensures predictable voltage limiting during transient events and is confirmed across production lots per Vishay's 88392 specification document.
Is SMBJ28CA-M3/5B suitable for automotive applications?
SMBJ28CA-M3/5B itself is not AEC-Q101 qualified; however, the functionally identical SMBJ28CAHM3_B/I variant is fully AEC-Q101 qualified and shares the same M3 halogen-free, RoHS-compliant construction. For automotive use, engineers should specify the HM3-suffixed part - SMBJ28CA-M3/5B remains appropriate for commercial and industrial applications requiring halogen-free compliance without automotive qualification.
How does the bidirectional design of SMBJ28CA-M3/5B affect PCB layout?
The bidirectional design of SMBJ28CA-M3/5B eliminates polarity constraints - no cathode band marking is present, and either terminal may connect to any node in a differential or floating circuit. This simplifies PCB routing for AC-coupled lines like RS-485 or LIN bus, removes orientation verification during assembly, and avoids incorrect placement errors common with unidirectional TVS diodes.
What is the thermal resistance of SMBJ28CA-M3/5B, and how does it impact power dissipation?
SMBJ28CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pads per terminal. This means a 5.0 W steady-state power dissipation (PD) raises junction temperature by 500 °C above ambient - but since TVS operation is transient, this RθJA governs short-pulse thermal accumulation and derating above 25 °C ambient per Figure 2 in the datasheet.
Does SMBJ28CA-M3/5B meet UL recognition standards?
Yes - SMBJ28CA-M3/5B carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. This applies to both unidirectional and bidirectional variants in the SMBJ family and confirms suitability for use in safety-critical surge protection circuits in North American end equipment.
SMBJ28CA-M3/5B 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- 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)
SMBJ28CA-M3/5B FAQ
1.How can I place an order for SMBJ28CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CA-M3/5B 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 SMBJ28CA-M3/5B reliable?
The price and inventory of SMBJ28CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ28CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CA-M3/5B?
SMBJ28CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CA-M3/5B 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 SMBJ28CA-M3/5B?
For technical support, including SMBJ28CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ28CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ28CA-M3/5B 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 SMBJ28CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ28CA-M3/5B?
All SMBJ28CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CA-M3/5B, 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 SMBJ28CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ28CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CA-M3/5B Tags
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