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Vishay General Semiconductor - Diodes Division SMBJ120-E3/52
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- Part No.:
- SMBJ120-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120-E3/52.pdf
- Description:
- TVS DIODE 120VWM 214VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,673
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Product details
Overview
SMBJ120-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR at 1 mA), 193 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps transients to ≤193 V at rated surge. It is deployed in industrial motor drives to safeguard MOSFET gate drivers against inductive switching spikes.
For engineers reviewing the SMBJ120-E3/52 datasheet, SMBJ120-E3/52 pinout, SMBJ120-E3/52 application, or SMBJ120-E3/52 equivalent, key selection criteria include verified clamping voltage at rated IPPM, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and RoHS-compliant SMB (DO-214AA) packaging suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse standoff threshold. Its silicon avalanche junction delivers sub-nanosecond response time and low dynamic impedance during surge events, enabling effective suppression of ESD, lightning-induced surges, and inductive kickback.
The SMBJ120-E3/52 is rated for 600 W peak pulse power (10/1000 µs), 5.0 W steady-state power dissipation at 50 °C, and supports operating junction temperatures from –55 °C to +150 °C. Its unidirectional configuration requires correct anode–cathode orientation relative to protected circuit polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant leakage; defines upper limit of normal operating rail. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | ≤193 V at IPPM = 193 A - Measured maximum voltage seen by protected circuit during full-rated surge event. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Surge energy handling capacity; validates suitability for IEC 61000-4-5 Level 3/4 threats. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm max length, 4.06 mm max width, and matte tin-plated leads. |
| Polarity | Unidirectional - Cathode denoted by band; blocks forward conduction until avalanche threshold exceeded in reverse bias. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, two-terminal device with molded epoxy case meeting UL 94 V-0. Cathode identified by molded band; no polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential node; completes current path during clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., 120 V rail); band-marked terminal accepts transient surge into device. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robustness against high-energy transients per IEC 61000-4-5, including indirect lightning surges. |
| Clamping voltage ≤193 V at 193 A | Ensures downstream components (e.g., MOSFETs, controllers) remain below absolute maximum ratings during surge. |
| MSL Level 1 (260 °C reflow) | Supports lead-free soldering without moisture-related popcorning; eliminates pre-bake requirement for SMT lines. |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown characteristics across temperature and lifetime stress. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets environmental compliance for global commercial electronics; excludes halogenated flame retardants. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate driver ICs and bootstrap circuits against voltage spikes from IGBT/MOSFET switching in 3-phase inverters. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between gate driver output and power switch gate. Use Value: Limits gate-source voltage to ≤193 V during 193 A surge, preventing gate oxide rupture and ensuring functional safety compliance. |
Use Scenario: Input-stage surge suppression on 48 V DC telecom rectifier outputs feeding base station control boards. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side distribution rail upstream of POL converters. Use Value: Clamps induced surges from AC line coupling or hot-swap events to safe levels before reaching sensitive PMICs and FPGAs. |
| Automotive Body Control Modules | Industrial PLC I/O Cards |
|
Use Scenario: Protection of LIN bus transceivers and microcontroller GPIOs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary-level TVS on 12 V supply rail feeding communication ICs. Use Value: Withstands 600 W pulses while maintaining VWM = 120 V margin above 14 V nominal, meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Analog input channel protection on 24 V-powered sensor interface cards exposed to field wiring transients. IC Role / Device Role / Timing Role: Point-of-entry clamping device on signal conditioning front-end before ADC driver stage. Use Value: Limits transient overshoot to <193 V, preserving 24 V signal integrity and preventing latch-up in op-amps and precision references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure). | Direct substitution when halogen-free bill-of-materials is required; same layout and thermal performance. |
| SMCJ120A-E3/52 | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; RθJA = 50 °C/W vs. 100 °C/W. | Higher power derating capability and improved thermal margin; suited for high-ambient or high-duty-cycle surge environments. | Preferred where board space allows and thermal headroom is critical; requires PCB footprint change. |
Compared with SMBJ120-E3/52, the M3 variant offers identical protection performance with halogen-free construction, while the SMCJ120A-E3/52 provides superior thermal management at the cost of larger footprint-enabling higher sustained surge resilience in thermally constrained designs.
Availability
SMBJ120-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply with full traceability and commercial-grade reliability.
Supply support for SMBJ120-E3/52 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 and application-specific optimization.
The SMBJ series targets surface-mount transient suppression in space-constrained, high-reliability systems-designed to replace older axial-leaded TVS devices while maintaining compatibility with automated SMT lines and IPC Class 3 assembly standards.
FAQ
What is the clamping voltage of SMBJ120-E3/52 at its rated peak pulse current?
The SMBJ120-E3/52 has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 193 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals and defines the highest voltage imposed on the protected circuit during full-rated surge conditions, ensuring downstream components remain within safe operating limits.
Is SMBJ120-E3/52 suitable for automotive applications?
The SMBJ120-E3/52 is a commercial-grade part (E3 suffix) and not AEC-Q101 qualified. For automotive use, Vishay specifies the HE3 variant (e.g., SMBJ120AHE3_B/H), which undergoes stress testing per AEC-Q101. The SMBJ120-E3/52 may be used in non-safety-critical aftermarket or industrial vehicle systems, but OEM automotive designs require the HE3 or HM3 qualified versions.
What does the "-E3/52" suffix indicate in SMBJ120-E3/52?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/52" specifies packaging in 7-inch plastic tape-and-reel format with 750 units per reel. This ordering code confirms compliance with JEDEC J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance, making SMBJ120-E3/52 compatible with standard lead-free reflow processes.
How does SMBJ120-E3/52 differ from bidirectional TVS diodes like SMBJ120CA?
The SMBJ120-E3/52 is unidirectional and conducts only in reverse breakdown, requiring correct polarity placement with cathode toward the protected line. In contrast, SMBJ120CA is bidirectional and symmetrical-offering identical clamping in both directions, ideal for AC lines or differential buses. The SMBJ120-E3/52 provides lower leakage and tighter VBR tolerance in DC applications where polarity is fixed.
What is the thermal resistance and maximum junction temperature of SMBJ120-E3/52?
The SMBJ120-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards, and a maximum operating junction temperature (TJ max.) of +150 °C. These values define its power derating curve above 25 °C ambient and confirm suitability for enclosed industrial enclosures with moderate airflow.
SMBJ120-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 214V
- Current - Peak Pulse (10/1000µs):
- 2.8A
- 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)
SMBJ120-E3/52 FAQ
1.How can I place an order for SMBJ120-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120-E3/52 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 SMBJ120-E3/52 reliable?
The price and inventory of SMBJ120-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ120-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120-E3/52?
SMBJ120-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120-E3/52 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 SMBJ120-E3/52?
For technical support, including SMBJ120-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120-E3/52 requirements.
6.How does Aetrix verify that SMBJ120-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ120-E3/52 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 SMBJ120-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ120-E3/52?
All SMBJ120-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120-E3/52, 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 SMBJ120-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ120-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120-E3/52 Tags
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