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Vishay General Semiconductor - Diodes Division SMBJ30D-M3/I
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- Part No.:
- SMBJ30D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30D-M3/I.pdf
- Description:
- TVS DIODE 30VWM 47.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,928
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Product details
Overview
SMBJ30D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 30 V stand-off voltage (VWM), 33.8–36.3 V breakdown voltage (VBR) at 1 mA, 47.7 V clamping voltage (VC) at 12.6 A peak pulse current, and 600 W peak pulse power rating under 10/1000 μs waveform - used for protecting MOSFETs and signal lines in industrial power supplies against inductive switching transients.
For engineers reviewing the SMBJ30D-M3/I datasheet, SMBJ30D-M3/I pinout, SMBJ30D-M3/I application, or SMBJ30D-M3/I equivalent, key selection criteria include unidirectional polarity, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), M3-grade halogen-free RoHS-compliant construction, and J-STD-020 MSL Level 1 reflow compatibility up to 260 °C.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, entering avalanche conduction when reverse voltage exceeds its specified VBR range. Its low incremental surge resistance and fast response time ensure effective suppression of transient energy without significant voltage overshoot.
Designed for unidirectional protection only, SMBJ30D-M3/I features a cathode band marking, requires no biasing, and functions across -55 °C to +150 °C junction temperature range. Thermal resistance is 125 °C/W (junction-to-ambient, mounted on minimum pad layout) and 20 °C/W (junction-to-mount).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 33.8 V / 36.3 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on threshold |
| VC @ IPPM | 47.7 V at 12.6 A - clamped voltage during 10/1000 μs surge limits stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling capability defines transient energy absorption capacity |
| ID @ VWM | <0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - high junction temperature rating supports operation in thermally demanding environments |
| RθJA | 125 °C/W - thermal resistance determines allowable power dissipation on standard PCB pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, M3-grade with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-voltage reference; current flows from cathode to anode during clamping |
| Cathode | High-side connection with polarity band marking | Connected to protected line; avalanche conduction initiates when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise overvoltage threshold control without design margin inflation |
| 600 W peak pulse power (10/1000 μs) | Supports robust protection against IEC 61000-4-5 Level 4 surges in industrial interfaces |
| MSL Level 1, 260 °C peak reflow | Allows single-pass lead-free reflow assembly without moisture-related reliability risk |
| <0.5 μA reverse leakage at VWM | Maintains signal fidelity on high-impedance sensor or communication lines |
| SMB (DO-214AA) footprint | Provides standardized layout compatibility across Vishay's SMBJ family and industry-referenced designs |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Protecting 24 V DC input rails in programmable logic controllers (PLCs) against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits voltage excursion to ≤47.7 V during 12.6 A surges, preventing damage to 36 V-rated input stages while maintaining <0.5 μA leakage at nominal 30 V operation. | Use Scenario: Safeguarding LIN bus and switch inputs in BCMs exposed to battery voltage spikes and ESD events. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected from signal line to ground, leveraging fast response to suppress sub-100 ns transients without affecting 19.2 kbps LIN timing. Use Value: Clamps 10/1000 μs surges to 47.7 V while adding negligible capacitance, preserving signal edge integrity and meeting ISO 7637-2 Pulse 1/2a immunity requirements. |
| Telecom Interface Surge Protection | Motor Drive Gate Driver Protection |
Use Scenario: Shielding RS-485 transceiver I/O pins in base station remote units from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS installed per-line (A/B) to ground, coordinated with common-mode chokes to handle differential and common-mode transients. Use Value: Absorbs 600 W peak pulses without degradation, ensuring >100,000 surge cycles per IEC 61000-4-5, with VWM = 30 V matching typical RS-485 common-mode range. | Use Scenario: Protecting high-side and low-side gate driver outputs in 3-phase inverters from Miller-induced voltage spikes during IGBT/MOSFET switching. IC Role / Device Role / Timing Role: TVS placed between gate and source/emitter to clamp dv/dt-induced overshoot exceeding gate oxide rating. Use Value: Responds in <1 ps to limit gate-source voltage to ≤47.7 V, preventing cumulative oxide stress and ensuring >10⁶ switching cycles with no parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A-M3/I | Bidirectional variant with same VWM (30 V), but symmetric clamping in both polarities; VBR = 33.8–36.3 V in either direction | Required where AC-coupled or floating signal lines need protection against reversals (e.g., Ethernet PHY pairs) | Select SMBJ30A-M3/I only if bidirectional clamping is explicitly needed; SMBJ30D-M3/I is optimal for DC-biased rails with defined polarity. |
| P6SMB30A | Same SMB package and 30 V VWM, but wider VBR tolerance (±5 %), higher ID (1.0 μA), and lower PPPM (600 W unchanged but derated faster above 25 °C) | Suitable for cost-sensitive consumer applications where tighter VBR and lower leakage are noncritical | Choose P6SMB30A only when budget constraints outweigh precision clamping and leakage requirements; SMBJ30D-M3/I delivers superior consistency and thermal stability. |
Compared with SMBJ30A-M3/I and P6SMB30A, SMBJ30D-M3/I provides tighter VBR tolerance (±3.5 % vs. ±5 %), lower leakage (<0.5 μA vs. 1.0 μA), and guaranteed M3-grade whisker resistance - making it preferred for industrial and automotive systems requiring long-term reliability under thermal cycling and high humidity.
Availability
SMBJ30D-M3/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom interface protection, and motor drive gate circuits requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ30D-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 application-specific optimization.
The SMBJ series is designed for high-energy transient suppression in harsh environments, targeting industrial automation, transportation, and communications infrastructure where consistent clamping performance and long-term stability are critical.
FAQ
What is the polarity configuration of SMBJ30D-M3/I?
SMBJ30D-M3/I is a unidirectional transient voltage suppressor diode, meaning it conducts only when the cathode is positive relative to the anode. The cathode is marked by a band on the SMB package body. This configuration is intended for DC-biased circuits where transient polarity is known and fixed, such as 24 V input rails or gate driver protection paths. SMBJ30D-M3/I does not conduct in forward bias beyond normal diode drop and offers no protection against reverse-polarity faults.
Does SMBJ30D-M3/I meet automotive qualification standards?
SMBJ30D-M3/I is not AEC-Q200 qualified, but it is rated for operation from -55 °C to +150 °C junction temperature and meets J-STD-020 MSL Level 1 reflow requirements up to 260 °C. It is widely used in automotive body electronics such as BCM inputs and LIN bus protection where full AEC-Q200 certification is not mandated. For safety-critical or powertrain applications, Vishay offers AEC-Q200-qualified alternatives like the AEC-Q200-compliant SMAJ30A series - SMBJ30D-M3/I remains appropriate for non-safety-critical automotive subsystems.
What is the clamping voltage of SMBJ30D-M3/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ30D-M3/I is 47.7 V at 12.6 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. VC is guaranteed across the full operating temperature range and is directly tied to the device's low incremental surge resistance - a key factor enabling reliable protection of 36 V-rated ICs and MOSFETs without overstress.
Can SMBJ30D-M3/I be used in bidirectional signal lines?
No, SMBJ30D-M3/I is strictly unidirectional and must not be used on AC-coupled or floating bidirectional signal lines such as RS-485, CAN, or Ethernet differential pairs. Using it in such configurations risks incomplete protection during negative-going transients. For those applications, the bidirectional variant SMBJ30A-M3/I is specified - it provides symmetrical clamping in both directions with identical VBR and VC characteristics. SMBJ30D-M3/I should only be applied where polarity is fixed and the protected node is referenced to ground or a stable DC potential.
What is the thermal resistance and power derating behavior of SMBJ30D-M3/I?
SMBJ30D-M3/I has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended PCB pad layout, and 100 °C/W on a 5.0 mm × 5.0 mm copper pad. Its steady-state power dissipation is 1.0 W at TA = 25 °C and derates linearly to zero at TA = 125 °C. For pulsed operation, peak power is limited to 600 W only for 10/1000 μs waveforms at ≤0.01 % duty cycle - sustained power must remain within DC limits defined by ambient temperature and layout. SMBJ30D-M3/I data sheet Figure 5 provides exact derating curves.
SMBJ30D-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):
- 30V
- Voltage - Breakdown (Min):
- 33.8V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- 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)
SMBJ30D-M3/I FAQ
1.How can I place an order for SMBJ30D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30D-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 SMBJ30D-M3/I reliable?
The price and inventory of SMBJ30D-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 SMBJ30D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ30D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30D-M3/I?
SMBJ30D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30D-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 SMBJ30D-M3/I?
For technical support, including SMBJ30D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30D-M3/I requirements.
6.How does Aetrix verify that SMBJ30D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ30D-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 SMBJ30D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ30D-M3/I?
All SMBJ30D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30D-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 SMBJ30D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ30D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30D-M3/I Tags
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Diodes Incorporated
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