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Vishay General Semiconductor - Diodes Division SMBJ120A-M3/52
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- Part No.:
- SMBJ120A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120A-M3/52.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ120A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 V maximum clamping voltage (VC) at 3.1 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ120A-M3/52 datasheet, SMBJ120A-M3/52 pinout, SMBJ120A-M3/52 application, or SMBJ120A-M3/52 equivalent, key selection criteria include clamping performance under 3.1 A surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR (133–147 V), it avalanches to divert surge current away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at 120 V), while the low incremental surge resistance enables tight clamping during fast transients.
The device is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and supports operation from –55 °C to +150 °C junction temperature. It meets MSL Level 1 per J-STD-020, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, and qualifies for commercial-grade applications with halogen-free construction (M3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin |
| VBR (Breakdown Voltage) | 133–147 V at 1.0 mA - guaranteed avalanche initiation range; ensures reliable triggering above normal operating voltage |
| VC (Clamping Voltage) | 193 V at IPPM = 3.1 A - peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 600 W - energy-handling capacity for standardized 10/1000 µs transient; validates protection against IEC 61000-4-5 Level 3 surges |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on recommended 5.0 mm × 5.0 mm pad layout; informs derating above 25 °C ambient |
| TJ max. | +150 °C - maximum allowable junction temperature; supports operation in high-temperature enclosures or near heat sources |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 0.205" × 0.130" footprint; compatible with standard reflow profiles and pick-and-place equipment |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for reliable solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return; completes clamping loop during transient events |
| Cathode | Reverse-biased terminal / Protection node | Connected to protected line (e.g., 120 V rail); avalanche conduction occurs when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates robust protection against lightning-induced surges and inductive switching spikes in industrial power systems |
| 193 V clamping voltage at 3.1 A | Limits voltage overshoot to <1.6× VWM, ensuring safe operation of 150 V-rated MOSFETs and controllers |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for export and automotive-tier supply chains without compromising reliability |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related delamination or popcorn failure |
| Glass-passivated junction | Provides stable VBR tolerance and low leakage (<1.0 µA) across temperature and lifetime, critical for long-term system integrity |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 120 V DC bus against back-EMF spikes from contactor switching and regenerative braking. IC Role / Device Role / Timing Role: Shunt TVS placed across bus input capacitor to clamp transients before they reach DC-DC converters and gate drivers. Use Value: Prevents repeated overstress of 150 V-rated SiC MOSFETs by limiting transient voltage to 193 V, extending system MTBF. |
Use Scenario: Input-stage surge suppression on 120 V AC/DC front-end rectifiers in 48 V telecom systems. IC Role / Device Role / Timing Role: Primary-level TVS connected between rectified output and ground to absorb IEC 61000-4-5 combination wave surges. Use Value: Maintains system uptime by preventing latch-up or destruction of downstream PFC controllers during field-deployed lightning events. |
| Automotive Body Control Modules | Industrial PLC I/O Cards |
Use Scenario: Protection of 120 V auxiliary power rail feeding solenoid drivers and CAN transceivers in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at rail entry point to suppress load-dump and jump-start transients per ISO 7637-2. Use Value: Ensures functional safety compliance by holding clamped voltage below 200 V, avoiding damage to AEC-Q100 qualified microcontrollers. |
Use Scenario: Field-side protection on analog input channels exposed to 120 V AC-coupled sensor wiring in harsh factory environments. IC Role / Device Role / Timing Role: TVS placed at connector interface to shunt induced surges before signal conditioning amplifiers and ADCs. Use Value: Eliminates false readings and sensor dropout by clamping transients within 1 ns response time, preserving measurement integrity. |
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-E3/52 | Same electrical specs, but RoHS-compliant with lead-free solderability; lacks halogen-free certification (M3) | Preferred for non-automotive commercial designs where halogen content is not regulated | Select E3 if halogen-free requirement is absent and cost sensitivity favors standard RoHS variant |
| SMCJ120A-M3 | Higher 1500 W PPPM rating, larger SMC (DO-214AB) package, same VWM/VBR/VC specs | Used where higher surge margin is required (e.g., outdoor telecom cabinets), but requires PCB layout change | Choose SMCJ120A-M3 only when 600 W is insufficient and board space allows larger footprint |
Compared with SMBJ120A-M3/52, the E3 variant offers identical protection performance with standard RoHS compliance, while the SMCJ120A-M3 delivers 2.5× surge power in a physically larger package - making SMBJ120A-M3/52 optimal for space-constrained, halogen-free industrial and automotive applications requiring precise 600 W capability.
Availability
SMBJ120A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, halogen-free compliance, and repeatable 600 W transient suppression performance.
Supply support for SMBJ120A-M3/52 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in demanding DC power and signal-line applications, balancing compact SMB packaging with 600 W surge capability and automotive-grade process controls.
FAQ
What is the clamping voltage of SMBJ120A-M3/52 at its rated peak pulse current?
The SMBJ120A-M3/52 has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 3.1 A under a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components like 200 V MOSFETs remain within safe operating area. The SMBJ120A-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ120A-M3/52 halogen-free and RoHS-compliant?
Yes, SMBJ120A-M3/52 is both halogen-free and RoHS-compliant, as confirmed by its "M3" suffix per Vishay's ordering nomenclature. This designation indicates compliance with JEDEC JS-011B for halogen content (<900 ppm bromine, <900 ppm chlorine, total ≤1500 ppm) and EU RoHS Directive 2011/65/EU. The SMBJ120A-M3/52 is suitable for environmentally regulated markets including automotive Tier 1 supply chains and EU industrial equipment.
What is the thermal resistance and maximum junction temperature of SMBJ120A-M3/52?
The SMBJ120A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, and a maximum junction temperature (TJ max.) of +150 °C. These values define its power dissipation limits: at 25 °C ambient, it can sustain 5.0 W continuous power (PD), but must be derated linearly above that temperature. The SMBJ120A-M3/52 remains fully functional up to its TJ max., supporting deployment in high-temperature enclosures.
How does SMBJ120A-M3/52 differ from bidirectional variants like SMBJ120CA?
The SMBJ120A-M3/52 is unidirectional, meaning it conducts only in reverse bias (cathode positive) and blocks forward current - ideal for DC rail protection where polarity is fixed. In contrast, SMBJ120CA is bidirectional, offering symmetrical clamping in both directions for AC-coupled or floating signal lines. The SMBJ120A-M3/52 uses a cathode band marking; SMBJ120CA has no polarity marking. Electrical parameters such as VWM, VBR, and VC are specified differently due to directionality - the SMBJ120A-M3/52 is not interchangeable with SMBJ120CA without circuit redesign.
What is the surge current rating and test waveform for SMBJ120A-M3/52?
The SMBJ120A-M3/52 is rated for a peak pulse current (IPPM) of 3.1 A under the standardized 10/1000 µs double-exponential waveform defined by R.E.A. and IEC 61000-4-5. This waveform simulates lightning-induced surges and inductive switching transients. The device sustains this rating at 0.01% duty cycle, with derating applied above 25 °C ambient per Figure 2 in the datasheet. The SMBJ120A-M3/52 also supports 100 A non-repetitive forward surge (IFSM) for 8.3 ms half-sine events, relevant for unidirectional power rail applications.
SMBJ120A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- 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)
SMBJ120A-M3/52 FAQ
1.How can I place an order for SMBJ120A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120A-M3/52 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 SMBJ120A-M3/52 reliable?
The price and inventory of SMBJ120A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ120A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120A-M3/52?
SMBJ120A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120A-M3/52 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 SMBJ120A-M3/52?
For technical support, including SMBJ120A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120A-M3/52 requirements.
6.How does Aetrix verify that SMBJ120A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ120A-M3/52 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 SMBJ120A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ120A-M3/52?
All SMBJ120A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120A-M3/52, 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 SMBJ120A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ120A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120A-M3/52 Tags
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