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Vishay General Semiconductor - Diodes Division SMBJ28D-M3/I
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- Part No.:
- SMBJ28D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28D-M3/I.pdf
- Description:
- TVS DIODE 28VWM 44.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,077
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Product details
Overview
SMBJ28D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, featuring a 28 V stand-off voltage (VWM), 31.6–33.9 V breakdown voltage (VBR) at 1 mA, 44.7 V clamping voltage (VC) at 13.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform. It protects MOSFETs and ICs against inductive switching transients in industrial power supplies.
For engineers reviewing the SMBJ28D-M3/I datasheet, SMBJ28D-M3/I pinout, SMBJ28D-M3/I application, or SMBJ28D-M3/I equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal derating behavior, clamping performance under surge conditions, and direct alternatives for circuit protection design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity identification, designed to shunt transient energy above its breakdown threshold while maintaining low leakage (<0.5 μA at 28 V) and fast response time. Its junction-to-ambient thermal resistance is 125 °C/W on minimum pad layout and 100 °C/W on 5 mm × 5 mm copper area.
The SMBJ28D-M3/I complies with UL 497B (QVGQ2 recognition), meets JESD201 Class 2 whisker resistance, and is halogen-free, RoHS-compliant, and rated for -55 °C to +150 °C operating junction temperature. It is not intended for bidirectional use - no cathode band appears on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum reverse working voltage before significant conduction begins; defines safe operating margin below clamping threshold |
| 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 during 10/1000 μs surge; limits downstream voltage stress to protected components |
| PPPM | 600 W - peak pulse power handling capability with 0.01 % duty cycle; validates robustness against lightning or ESD-like events |
| ID @ VWM | ≤0.5 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits |
| TJ max | +150 °C - maximum junction temperature; supports operation in enclosed industrial enclosures without forced cooling |
| RθJA | 125 °C/W - thermal resistance on minimum PCB pad; informs required board copper area for sustained power dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode identified by a single band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Banded end | Connected to protected line (e.g., DC input, signal trace); conducts surge current toward ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise overvoltage threshold setting without design margin inflation or post-layout tuning |
| 600 W PPPM (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) with margin when mounted per recommended pad layout |
| MSL Level 1 (260 °C peak) | Supports standard SMT reflow profiles without moisture-related popcorning or delamination risk |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial equipment requiring third-party safety certification |
| Halogen-free & RoHS | Meets environmental compliance requirements for global OEM shipments including EU and China RoHS |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Signal Lines |
|---|---|
Use Scenario: 24 V DC power rail in programmable logic controllers exposed to relay coil flyback and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going surges before they reach upstream DC-DC converters. Use Value: Limits transient voltage to ≤44.7 V, preventing damage to 36 V-rated input stages and enabling reliable operation per IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge). | Use Scenario: LIN bus or sensor supply lines (e.g., ambient temperature, door position) in BCMs subject to battery disconnect spikes and alternator load dump. IC Role / Device Role / Timing Role: Standoff-clamp protector on 12 V auxiliary rails, oriented anode-to-ground to suppress positive transients only. Use Value: With 28 V VWM and 44.7 V VC, it avoids false triggering during normal 13.5–14.8 V charging but clamps 100 V+ load dump events within safe limits for 30 V tolerant transceivers. |
| Telecom DSL Line Interface | Consumer Appliance Motor Drive Board |
Use Scenario: Protection of ADSL/VDSL line driver ICs connected to external telephone wiring susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on tip/ring lines, paired with gas discharge tube (GDT) for staged protection; SMBJ28D-M3/I handles fast-rising, low-energy transients. Use Value: Fast response time and 600 W rating ensure clamping occurs before secondary protection activates, reducing stress on downstream GDT and interface ICs. | Use Scenario: 24 V motor control board in washing machine or HVAC blower where brushed DC motor commutation generates repetitive inductive spikes. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals or H-bridge supply rail to absorb back-EMF energy during PWM switching transitions. Use Value: Low incremental surge resistance and 13.4 A IPPM capability sustain repeated 10/1000 μs pulses without degradation, extending board lifetime beyond 10,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A-M3/I | Same VWM (28 V), identical package and ratings, but uses "A" suffix indicating legacy marking code - functionally identical to SMBJ28D-M3/I per Vishay documentation | No difference in circuit implementation; same placement, polarity, and layout | Select SMBJ28A-M3/I only if legacy BOM alignment or distributor stock availability requires it; otherwise prefer D-suffix for latest revision traceability |
| SMCJ28A | Higher PPPM (1500 W), larger SMC (DO-214AB) package, 12.5 A IPPM at 44.7 V VC - same clamping but higher surge capacity and thermal mass | Requires larger PCB footprint and different pad layout; suited for higher-energy surge environments (e.g., outdoor AC mains interfaces) | Choose SMCJ28A only when 600 W is insufficient and board space allows SMC package; SMBJ28D-M3/I remains optimal for space-constrained 24 V DC systems |
Compared with SMBJ28A-M3/I, the SMBJ28D-M3/I offers identical electrical performance with updated manufacturing traceability; versus SMCJ28A, it trades surge headroom for compact size and lower thermal resistance on dense layouts - making SMBJ28D-M3/I the preferred choice for cost- and space-sensitive industrial DC inputs.
Availability
SMBJ28D-M3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom line interfaces, and consumer appliance motor controls requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ28D-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, precision, and industrial-grade qualification.
The SMBJ series was developed specifically for surface-mount transient suppression in space-constrained, high-reliability DC power and signal lines - balancing tight VBR tolerance, low leakage, and robust 600 W surge capability in the compact SMB package.
FAQ
What is the polarity configuration of SMBJ28D-M3/I?
The SMBJ28D-M3/I is a unidirectional TVS diode with cathode identified by a single band at one end. The banded terminal is the cathode and must be connected to the line being protected; the non-banded end is the anode and connects to ground. This orientation enables clamping of positive-going transients only - bidirectional variants (e.g., SMBJ28CD) omit the band and conduct in both directions.
Does SMBJ28D-M3/I meet UL safety certification?
Yes, SMBJ28D-M3/I is Underwriters Laboratories (UL) recognized under standard UL 497B with file number E136766 for both unidirectional and bidirectional variants. This certification confirms its suitability for use in safety-critical telecom and industrial equipment where transient protectors require third-party validation of construction, materials, and performance under surge stress.
What is the maximum clamping voltage of SMBJ28D-M3/I under surge conditions?
The SMBJ28D-M3/I has a maximum clamping voltage (VC) of 44.7 V at 13.4 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential surge waveform. This value represents the upper limit of voltage seen by downstream components during worst-case transient events and is critical for ensuring compatibility with 36 V-rated ICs and MOSFETs in 24 V systems.
Can SMBJ28D-M3/I be used in bidirectional signal line protection?
No, SMBJ28D-M3/I is strictly unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN without additional circuitry. For bidirectional protection, Vishay specifies the SMBJ28CD variant, which lacks the cathode band and provides symmetrical clamping in both polarities. Using SMBJ28D-M3/I on AC or differential signals risks forward conduction and failure during negative transients.
What is the thermal resistance and how does it affect PCB layout for SMBJ28D-M3/I?
SMBJ28D-M3/I has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W on minimum recommended pad layout and 100 °C/W on a 5 mm × 5 mm copper pad. This means that for every watt of average power dissipated, junction temperature rises by up to 125 °C above ambient - so layout must include adequate copper area to avoid exceeding the +150 °C maximum junction temperature during repetitive surge events.
SMBJ28D-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ28D-M3/I FAQ
1.How can I place an order for SMBJ28D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28D-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 SMBJ28D-M3/I reliable?
The price and inventory of SMBJ28D-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 SMBJ28D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ28D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28D-M3/I?
SMBJ28D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28D-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 SMBJ28D-M3/I?
For technical support, including SMBJ28D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28D-M3/I requirements.
6.How does Aetrix verify that SMBJ28D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28D-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 SMBJ28D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ28D-M3/I?
All SMBJ28D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28D-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 SMBJ28D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ28D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28D-M3/I Tags
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Diodes Incorporated
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