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Vishay General Semiconductor - Diodes Division SMBJ120D-M3/H
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- Part No.:
- SMBJ120D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120D-M3/H.pdf
- Description:
- TVS DIODE 120VWM 190VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
SMBJ120D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 120 V stand-off voltage (VWM), 135–145 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps transients to ≤190 V at 3.15 A IPPM - deployed across power supply rails and I/O lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ120D-M3/H datasheet, SMBJ120D-M3/H pinout, SMBJ120D-M3/H application, or SMBJ120D-M3/H equivalent, key selection criteria include unidirectional polarity, SMB (DO-214AA) package compatibility, 125 °C/W junction-to-ambient thermal resistance, and compliance with UL 497B for surge protector classification.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, activating when reverse voltage exceeds its VBR threshold to divert surge current away from downstream components. Its low incremental surge resistance and fast response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The SMBJ120D-M3/H is rated for 150 °C maximum junction temperature, supports 0.5 μA max reverse leakage at 120 V, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - confirming suitability for high-reliability automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 135 V / 145 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | ≤190 V at 3.15 A - clamping voltage defines worst-case stress on protected ICs during 600 W surge |
| PPPM | 600 W (10/1000 μs waveform) - standardized surge energy handling per ANSI/IEEE C62.35 |
| ID @ VWM | ≤0.5 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| RθJA | 125 °C/W - thermal resistance determines safe power derating above 25 °C ambient |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 5.59 mm × 4.06 mm footprint |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band on one end. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes conduction path during reverse-biased clamping |
| Cathode | High-side connection point | Connected to protected line (e.g., 120 V supply rail); band-marked end indicates polarity orientation |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage thresholds and reduces design margin uncertainty |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV) surges on 50 Ω source impedance without failure |
| UL 497B recognized (QVGQ2) | Validates compliance for telecom and industrial surge protection systems requiring safety certification |
| MSL Level 1, 260 °C peak | Supports single-pass lead-free reflow without baking or special handling protocols |
| Halogen-free, RoHS-compliant | Fulfills environmental compliance requirements for EU, China, and global OEM supply chains |
Applications
| Industrial Motor Drive Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting gate drivers and feedback sensors from flyback voltage spikes generated by IGBT/MOSFET switching in 3-phase inverters. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus rails or isolated signal lines to clamp transients below MOSFET VDS(max) and op-amp input ratings. Use Value: Prevents cumulative degradation of isolation amplifiers and gate drivers under repetitive 600 W surges, extending system MTBF. |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs from induced surges on outdoor copper lines exposed to lightning coupling. IC Role / Device Role / Timing Role: Primary clamping element on differential data pairs and power inputs, coordinated with GDT or MOV secondary stages. Use Value: Limits clamped voltage to ≤190 V, keeping transceiver common-mode range within ±25 V specification and avoiding latch-up. |
| Power Supply Input Stage | Automotive Body Control Module |
Use Scenario: Safeguarding AC/DC and DC/DC converter inputs against load dump and ISO 7637-2 Pulse 5a surges in industrial power supplies. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of rectifier and bulk capacitor, absorbing energy before it reaches primary-side controllers. Use Value: Withstands 600 W pulses without parametric shift, maintaining regulation stability during repeated 120 V-rated transients. |
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from battery line transients during jump-start or alternator load dump events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, placed directly at connector entry points on PCB edge. Use Value: 120 V VWM aligns with 12 V automotive nominal systems; 190 V VC ensures MCU GPIOs remain below absolute maximum rating during 100 V surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ120A | Same VWM (120 V), but wider VBR tolerance (±5 %); 400 W PPPM rating | Lower surge capacity limits use in high-energy industrial environments | Select when cost sensitivity outweighs need for 600 W headroom and tighter VBR control |
| ON Semiconductor 1.5SMC120A | Identical VWM/VBR specs, but DO-214AB (SMA) package - 2.5 mm wider body than SMB | Requires PCB layout revision due to larger footprint and different pad geometry | Choose only if existing SMA footprint is standardized and thermal performance allows 100 °C/W RθJA |
Compared with SMBJ120D-M3/H, the SMAJ120A offers lower cost but reduced surge margin and looser VBR control, while the 1.5SMC120A matches electrical specs but demands mechanical redesign - making SMBJ120D-M3/H optimal for new designs prioritizing precision clamping and compact SMB layout.
Availability
SMBJ120D-M3/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ120D-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping and certified safety are mandatory.
FAQ
What is the maximum clamping voltage of the SMBJ120D-M3/H under a 600 W surge?
The SMBJ120D-M3/H clamps to a maximum of 190 V at its rated peak pulse current of 3.15 A (10/1000 μs waveform). This value is guaranteed per the Vishay datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Does the SMBJ120D-M3/H have bidirectional capability?
No, the SMBJ120D-M3/H is a unidirectional TVS diode, indicated by the absence of the "C" suffix (e.g., SMBJ120CD would be bidirectional). Its cathode band marks the high-side terminal, and it conducts only during reverse-bias overvoltage conditions - making it suitable for DC rail protection where polarity is fixed.
What does the "-M3/H" suffix signify in SMBJ120D-M3/H?
The "-M3" denotes halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance, while "/H" specifies packaging in 7″ diameter plastic tape and reel with 750 units per reel. This ordering code ensures consistency in material compliance, reliability testing, and SMT assembly logistics for the SMBJ120D-M3/H.
Can SMBJ120D-M3/H replace SMBJ120A in an existing design?
Yes - SMBJ120D-M3/H is functionally identical to SMBJ120A in electrical specifications and SMB package dimensions. The "D" suffix confirms the same 1.0 W power rating at 25 °C and 5.0 W at 50 °C, and both share identical VWM, VBR, and VC values. No layout or schematic changes are required for drop-in replacement.
Is SMBJ120D-M3/H certified for safety standards like UL 497B?
Yes, the SMBJ120D-M3/H carries Underwriters Laboratory Recognition under UL 497B (file E136766) for both unidirectional and bidirectional variants in the SMBJ family. This certification validates its use in surge-protective devices for telecom and industrial applications where third-party safety compliance is mandatory.
SMBJ120D-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 135V
- Voltage - Clamping (Max) @ Ipp:
- 190V
- Current - Peak Pulse (10/1000µs):
- 3.15A
- 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)
SMBJ120D-M3/H FAQ
1.How can I place an order for SMBJ120D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120D-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 SMBJ120D-M3/H reliable?
The price and inventory of SMBJ120D-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 SMBJ120D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ120D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120D-M3/H?
SMBJ120D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120D-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 SMBJ120D-M3/H?
For technical support, including SMBJ120D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120D-M3/H requirements.
6.How does Aetrix verify that SMBJ120D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120D-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 SMBJ120D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ120D-M3/H?
All SMBJ120D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120D-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 SMBJ120D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ120D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120D-M3/H Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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