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Vishay General Semiconductor - Diodes Division SMBJ28CD-M3/I
- Part No.:
- SMBJ28CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CD-M3/I.pdf
- Description:
- TVS DIODE 28VWM 44.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,542
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Product details
Overview
SMBJ28CD-M3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.6–33.9 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤44.7 V at 13.4 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ28CD-M3/I datasheet, SMBJ28CD-M3/I pinout, SMBJ28CD-M3/I application, or SMBJ28CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction per JESD 201 Class 2 whisker test.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both polarities, enabling suppression of positive and negative transients without polarity dependency. Its low incremental surge resistance and fast response time ensure effective protection against ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ28CD-M3/I is rated for junction temperatures from –55 °C to +150 °C, with thermal resistance RθJA = 125 °C/W (on minimum pad layout) and RθJM = 20 °C/W. It meets UL 497B recognition (QVGQ2) and complies with ANSI/IEEE C62.35 surge waveform standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.6 V / 33.9 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | ≤44.7 V at 13.4 A - clamping voltage defines worst-case stress on downstream circuitry |
| PPPM | 600 W (10/1000 μs waveform) - peak transient energy handling capacity under standardized surge test |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - enables reliable operation in high-temperature industrial and automotive-adjacent environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; no cathode band (bidirectional configuration); meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - bidirectional clamping allows placement without orientation constraints |
| Cathode end (not marked) | N/A - no polarity marking | Absence of band confirms bidirectional design; terminals are interchangeable in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| ±3.5 % VBR tolerance | Reduces design margin uncertainty and supports tighter system-level surge threshold planning |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) when applied with appropriate series impedance |
| MSL Level 1 rating | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and process complexity |
| Halogen-free & RoHS | Complies with environmental regulations and supports lead-free soldering processes (J-STD-002/JESD 22-B102) |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in PLC modules from field-induced transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt surge energy before it reaches precision DAC or op-amp circuitry. Use Value: Limits induced voltage to ≤44.7 V, preventing latch-up or permanent damage to 3.3 V/5 V signal chain components. |
Use Scenario: Shielding Ethernet PHY differential pairs or RS-485 bus lines from lightning-induced common-mode surges in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional clamping element mounted across differential pair to suppress symmetric transients while preserving signal integrity. Use Value: Symmetrical VBR ensures equal clamping in both directions, maintaining common-mode rejection ratio (CMRR) during surge events. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus communication lines in door module ECUs exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary overvoltage clamp downstream of primary protection, absorbing residual energy after upstream TVS or fuse activation. Use Value: 150 °C max junction temperature rating supports under-hood deployment without derating in ambient >105 °C environments. |
Use Scenario: Protecting microcontroller GPIOs driving relay coils or small DC motors in smart home appliances subject to inductive kickback. IC Role / Device Role / Timing Role: Fast-response TVS placed across coil terminals or MCU output pins to clamp flyback voltage spikes. Use Value: 13.4 A IPPM rating handles typical 12 V/24 V relay coil energy discharge without degradation over 100,000+ cycles. |
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 (Vishay) | Same VWM/VBR/PPPM specs; differs in packaging (tape-and-reel quantity: 5,000 vs. 3,200) and M3 suffix compliance level (E3 lacks JESD 201 Class 2 whisker test validation) | Not qualified for high-reliability industrial deployments requiring whisker resistance certification | Select SMBJ28CD-M3/I when JESD 201 Class 2 whisker performance and halogen-free compliance are mandatory |
| 1.5SMC28CA (ON Semiconductor) | Same SMB package and bidirectional 28 V rating, but 1.5 kW peak power (10/1000 μs); higher VC (48.4 V) and wider VBR tolerance (±5 %) | Better suited for higher-energy surge environments where clamping voltage margin permits | Choose SMBJ28CD-M3/I where tighter VBR tolerance, lower clamping voltage, and MSL Level 1 reflow compatibility are prioritized over raw power rating |
Compared with SMBJ28CA-E3/52, the SMBJ28CD-M3/I provides certified whisker resistance and stricter VBR control; versus 1.5SMC28CA, it delivers lower clamping voltage and tighter tolerance at the expense of peak power headroom - making it optimal for precision-sensitive, high-volume industrial designs.
Availability
SMBJ28CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ28CD-M3/I 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 was engineered for robust transient suppression in space-constrained surface-mount applications, targeting industrial automation, communications infrastructure, and automotive subsystems where consistent clamping performance and manufacturability are critical.
FAQ
What is the clamping voltage of SMBJ28CD-M3/I at its rated peak pulse current?
The SMBJ28CD-M3/I clamps to a maximum of 44.7 V at its rated peak pulse current of 13.4 A (10/1000 μs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28CD-M3/I maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), ensuring consistent protection in harsh environments.
Is SMBJ28CD-M3/I suitable for bidirectional signal line protection?
Yes, SMBJ28CD-M3/I is explicitly designed for bidirectional protection, as indicated by the "CD" suffix and absence of cathode band marking. Its symmetrical breakdown characteristics allow identical clamping behavior for both positive and negative transients - making it ideal for AC-coupled interfaces like RS-485, CAN FD physical layers, or audio input circuits where polarity cannot be assumed. The SMBJ28CD-M3/I does not require orientation during placement.
Does SMBJ28CD-M3/I meet RoHS and halogen-free requirements?
Yes, SMBJ28CD-M3/I carries the "M3" suffix, confirming compliance with RoHS Directive 2011/65/EU and halogen-free construction per IEC 61249-2-21. It also passes JESD 201 Class 2 whisker testing and meets UL 94 V-0 flammability standards. These qualifications make SMBJ28CD-M3/I suitable for consumer, industrial, and medical equipment where regulatory compliance and long-term reliability are mandatory.
What is the thermal resistance of SMBJ28CD-M3/I on standard PCB layout?
The SMBJ28CD-M3/I exhibits a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout per Vishay's datasheet. On a 5.0 mm × 5.0 mm copper pad, RθJA improves to 100 °C/W. Its junction-to-mount thermal resistance (RθJM) is 20 °C/W, supporting effective heat transfer to heatsinked or thermally enhanced PCB regions - critical for sustained surge duty cycles in industrial controls.
How does the ±3.5 % VBR tolerance of SMBJ28CD-M3/I impact circuit design?
The ±3.5 % VBR tolerance (31.6–33.9 V at 1 mA) ensures highly predictable turn-on behavior across production units, reducing the need for oversized voltage margins in protected circuitry. For example, when safeguarding a 24 V nominal system, this tight tolerance guarantees clamping initiates well before reaching 36 V rail limits - improving system robustness without compromising noise immunity. The SMBJ28CD-M3/I achieves this via precision silicon processing and 100 % VBR screening.
SMBJ28CD-M3/I 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):
- 31.6V
- Voltage - Clamping (Max) @ Ipp:
- 44.7V
- Current - Peak Pulse (10/1000µs):
- 13.4A
- 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)
SMBJ28CD-M3/I FAQ
1.How can I place an order for SMBJ28CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CD-M3/I 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 SMBJ28CD-M3/I reliable?
The price and inventory of SMBJ28CD-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ28CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CD-M3/I?
SMBJ28CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CD-M3/I 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 SMBJ28CD-M3/I?
For technical support, including SMBJ28CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CD-M3/I requirements.
6.How does Aetrix verify that SMBJ28CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28CD-M3/I 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 SMBJ28CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ28CD-M3/I?
All SMBJ28CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CD-M3/I, 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 SMBJ28CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ28CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CD-M3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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