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Vishay General Semiconductor - Diodes Division SMBJ28CD-M3/H
- Part No.:
- SMBJ28CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CD-M3/H.pdf
- Description:
- TVS DIODE 28VWM 44.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,038
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Product details
Overview
SMBJ28CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 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 per 10/1000 μs waveform - deployed for ESD and surge protection on signal lines of industrial sensor interfaces and telecom data ports.
For engineers reviewing the SMBJ28CD-M3/H datasheet, SMBJ28CD-M3/H pinout, SMBJ28CD-M3/H application, or SMBJ28CD-M3/H equivalent, key selection criteria include bidirectional clamping behavior, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction suitable for automated SMT assembly.
Technical Context
This device operates as a voltage-clamped transient protector with symmetrical avalanche response in both polarities, enabling robust suppression of positive and negative transients without polarity dependency. Its 13.4 A IPPM at 44.7 V VC ensures effective energy diversion during IEC 61000-4-5 surge events while maintaining low incremental surge resistance.
The SMBJ28CD-M3/H leverages planar junction technology to achieve tight 3.5 % VBR tolerance and stable thermal performance up to TJ = 150 °C. It is rated for 1.0 W steady-state power dissipation at TA = 25 °C and derates linearly above that ambient temperature per the published thermal curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 31.6 V / 33.9 V at 1 mA - precise breakdown threshold with ±3.5 % tolerance for predictable clamping onset |
| VC @ IPPM | 44.7 V at 13.4 A - clamped voltage during 10/1000 μs surge, defining protected circuit's maximum transient excursion |
| PPPM | 600 W - peak transient power handling capability under standardized surge waveform |
| ID @ VWM | <0.5 μA - ultra-low reverse leakage preserves signal integrity in high-impedance sensor or data lines |
| TJ max | +150 °C - maximum junction temperature enabling operation in industrial ambient environments |
| RθJA | 125 °C/W - thermal resistance from junction to ambient on minimum recommended PCB pad layout |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; forms symmetrical clamping path with cathode |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; enables bidirectional conduction above VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| ±3.5 % VBR tolerance | Reduces design margin uncertainty and improves consistency across production batches |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without baking preconditioning |
| Halogen-free & RoHS | Meets industrial environmental compliance requirements and supports lead-free assembly processes |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surges in typical layouts |
Applications
| Industrial Sensor Interface Protection | Telecom Data Line Surge Suppression |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure, temperature, and flow sensors exposed to inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: TVS diode placed directly at connector entry point to clamp fast-rising transients before they reach precision ADC front-ends or microcontroller GPIOs. Use Value: Limits transient overvoltage to ≤44.7 V, preventing latch-up or permanent damage to downstream 3.3 V or 5 V logic while maintaining sub-0.5 μA leakage at 28 V nominal line voltage. | Use Scenario: Safeguarding RS-485/RS-422 differential data lines in base station backhaul modules subjected to lightning-induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS connected across differential pair (A–B) and to ground, absorbing common-mode and differential-mode transients simultaneously. Use Value: Clamps 10/1000 μs surges up to 13.4 A without degradation, preserving signal integrity below 10 Mbps and meeting ITU-T K.21 basic protection requirements. |
| Automotive Body Control Module Inputs | Consumer Appliance Communication Bus Protection |
Use Scenario: Shielding LIN bus inputs and switch sense lines in BCMs from load dump and ISO 7637-2 pulse 1/2a/3a transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Mounted at harness connector interface to shunt transient energy away from automotive-grade MCU input protection networks. Use Value: Withstands repetitive 600 W pulses at 0.01 % duty cycle and maintains <0.5 μA leakage at 28 V, supporting long-term reliability in under-hood thermal environments up to +125 °C ambient. | Use Scenario: Securing I²C and UART lines between MCU and display/control panel in smart home appliances subject to user-handling ESD and power supply coupling noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to IC pins to suppress human-body-model (HBM) ESD events up to ±15 kV without distorting low-speed digital waveforms. Use Value: Delivers sub-nanosecond response time and clamps ESD spikes within 44.7 V, preventing bit errors or reset events while adding negligible loading to 400 kHz I²C bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHE3/5BT | Same VWM/VBR/VC specs; differs in packaging (tape-and-reel vs. bulk) and MSL level (Level 1 vs. Level 2a) | Designed for high-volume automotive production with extended moisture sensitivity control | Select when full MSL Level 2a traceability and AEC-Q200-aligned process validation are required |
| P6SMB28CA | Identical electrical ratings but higher RθJA (150 °C/W vs. 125 °C/W); same SMB package and bidirectional function | Lower thermal efficiency limits sustained surge repetition rate in compact PCB layouts | Prefer SMBJ28CD-M3/H where board space is constrained and thermal relief pads are minimized |
Compared with SMBJ28CAHE3/5BT and P6SMB28CA, the SMBJ28CD-M3/H offers tighter VBR tolerance (±3.5 %), lower thermal resistance, and guaranteed halogen-free/RoHS/M3-grade construction - making it optimal for industrial SMT lines requiring high first-pass yield and long-term supply continuity.
Availability
SMBJ28CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interface protection, telecom data line surge suppression, and automotive body control module inputs requiring stable component supply, consistent MSL Level 1 handling, and verified halogen-free compliance.
Supply support for SMBJ28CD-M3/H 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 application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial, telecom, and automotive applications where repeatable clamping performance and long-term stability under thermal stress are critical.
FAQ
What is the clamping voltage of SMBJ28CD-M3/H at its rated peak pulse current?
The SMBJ28CD-M3/H has a maximum clamping voltage (VC) of 44.7 V at 13.4 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 87606). The SMBJ28CD-M3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ28CD-M3/H suitable for bidirectional signal line protection?
Yes, SMBJ28CD-M3/H is explicitly designed for bidirectional transient suppression, as indicated by the "CD" suffix and absence of cathode band marking. Its symmetrical breakdown characteristics (VBR min/max identical in both directions) allow it to protect AC-coupled, differential, or floating signal paths - such as RS-485 lines or sensor bridge outputs - without polarity concerns. The SMBJ28CD-M3/H meets this requirement per Vishay's stated electrical characteristics for bidirectional devices in the SMBJ5.0CD–SMBJ120CD family.
What is the maximum steady-state power dissipation of SMBJ28CD-M3/H at room temperature?
The SMBJ28CD-M3/H has a maximum steady-state power dissipation (PD) of 1.0 W at ambient temperature (TA) = 25 °C, as specified in the "Maximum Ratings" table of the Vishay datasheet. This rating assumes mounting on the minimum recommended PCB pad layout. At higher ambient temperatures, power must be derated linearly per Figure 5 in Document Number 87606, with zero dissipation reached at TA ≈ 125 °C for the SMBJ28CD-M3/H.
Does SMBJ28CD-M3/H meet RoHS and halogen-free requirements?
Yes, SMBJ28CD-M3/H is halogen-free, RoHS-compliant, and classified as industrial grade per Vishay's ordering information and mechanical data. The "M3" suffix confirms compliance with JESD 201 Class 2 whisker testing and UL 94 V-0 flammability rating for the molding compound. These attributes are documented in the official Vishay datasheet (87606, revision 09-Jan-2024) and validated through Vishay's material categorization system (www.vishay.com/doc?99912).
What is the leakage current specification for SMBJ28CD-M3/H at its stand-off voltage?
The SMBJ28CD-M3/H exhibits a maximum reverse leakage current (ID) of 0.5 μA at its rated stand-off voltage (VWM) of 28 V, tested at TA = 25 °C. This ultra-low leakage ensures minimal DC loading on high-impedance sensor outputs or bias networks. The value is specified in the "Electrical Characteristics" table for bidirectional SMBJ devices and applies equally in both directions due to the symmetric junction structure of the SMBJ28CD-M3/H.
SMBJ28CD-M3/H 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/H FAQ
1.How can I place an order for SMBJ28CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CD-M3/H 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/H reliable?
The price and inventory of SMBJ28CD-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ28CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CD-M3/H?
SMBJ28CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CD-M3/H 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/H?
For technical support, including SMBJ28CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CD-M3/H requirements.
6.How does Aetrix verify that SMBJ28CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28CD-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ28CD-M3/H?
All SMBJ28CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CD-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ28CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CD-M3/H Tags
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