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Vishay General Semiconductor - Diodes Division SMBJ120CD-M3/H
- Part No.:
- SMBJ120CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CD-M3/H.pdf
- Description:
- TVS DIODE 120VWM 190VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
SMBJ120CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. 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), <0.5 μA reverse leakage at VWM, and clamps to ≤190 V at 3.15 A peak surge current - used in industrial sensor interface protection and telecom line surge suppression.
For engineers reviewing the SMBJ120CD-M3/H datasheet, SMBJ120CD-M3/H pinout, SMBJ120CD-M3/H application, or SMBJ120CD-M3/H equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal derating curves, M3 halogen-free RoHS-compliant construction, and direct alternatives with documented VWM/VBR/PPPM alignment for ESD and lightning transient protection design.
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping positive and negative transients without polarity dependence. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of inductive switching spikes and ESD events per IEC 61000-4-2/4-4/4-5.
Rated for 150 °C maximum junction temperature and MSL Level 1 moisture sensitivity, it supports reflow soldering up to 260 °C peak. Thermal resistance is 125 °C/W (junction-to-ambient, minimum pad layout) and 20 °C/W (junction-to-mount), enabling stable operation under repetitive surge conditions when properly heatsinked.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 120 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown) | 135–145 V at 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on across production lots. |
| VC (Clamping) | ≤190 V at IPPM = 3.15 A - Limits downstream voltage stress during 10/1000 μs surge, protecting 150 V-rated ICs. |
| PPPM | 600 W - Peak transient energy handling capability with 0.01 % duty cycle; sufficient for IEC 61000-4-5 Level 4 surges. |
| ID (Leakage) | <0.5 μA at 120 V - Minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | 150 °C - Enables use in industrial environments with elevated ambient temperatures and limited airflow. |
| RθJA | 125 °C/W - Requires ≥5 mm × 5 mm copper pad for full 1.0 W steady-state dissipation at 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no cathode band marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Terminals 1 & 2) | Bidirectional avalanche junction | Identical terminals; either can serve as input or return path - enables placement flexibility on PCB without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Ensures consistent clamping threshold across batches, reducing design margin uncertainty in safety-critical protection circuits. |
| 600 W PPPM (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and telecom equipment without external series impedance. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning, simplifying manufacturing integration. |
| M3 suffix compliance | Halogen-free, RoHS-compliant, and JESD 201 Class 2 whisker-resistant - qualified for automotive and industrial long-life applications. |
| Low ID at VWM | <0.5 μA leakage preserves signal integrity in high-impedance sensor bias networks and battery-powered systems. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLC modules exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across signal and ground, absorbing transients before they reach ADC input or op-amp buffer. Use Value: Prevents latch-up or permanent damage to 16-bit precision ADCs by limiting transient voltage to ≤190 V while maintaining <0.5 μA DC loading. |
Use Scenario: Surge protection on RS-485 data lines in outdoor base station backhaul units subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary differential-mode TVS on twisted-pair bus, paired with common-mode chokes to meet IEC 61000-4-5 Level 4 (4 kV) Use Value: Clamps 10/1000 μs surges to ≤190 V within nanoseconds, preserving signal integrity and preventing transceiver IC failure without adding propagation delay. |
| Power Supply Input Stage | Automotive Body Control Module |
Use Scenario: Secondary overvoltage protection on 24 V DC input rails of embedded controllers after primary fuse and MOV stages. IC Role / Device Role / Timing Role: Fast-acting secondary clamp limiting residual overshoot from upstream MOV clamping tail or load dump events. Use Value: Handles 600 W peak pulses without degradation, ensuring sustained protection life over >100,000 surge events per MIL-STD-883H Method 3015.8. |
Use Scenario: CAN bus line protection in BCMs where ESD events occur during connector mating/unmating in humid environments. IC Role / Device Role / Timing Role: Bidirectional TVS placed across CAN_H/CAN_L differential pair to suppress ±8 kV contact ESD per ISO 10605. Use Value: Sub-1 ns response captures ESD rise time (<1 ns), clamping to ≤190 V while adding <0.5 pF capacitance - no data rate degradation at 500 kbps. |
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 SMAJ120CA | VWM = 120 V, VBR = 133–147 V, VC = 193 V at 3.1 A, same SMB package, MSL Level 1 | Marginally higher clamping voltage (+3 V) and wider VBR spread (±5.2 % vs. ±3.5 %) | Acceptable where tighter VBR tolerance is not required; identical board footprint and thermal profile. |
| ON Semiconductor SMCJ120CA | VWM = 120 V, VBR = 133–147 V, VC = 193 V at 3.1 A, SMB package, MSL Level 1, halogen-free | Same clamping performance but rated for 175 °C TJ max (vs. 150 °C), higher RθJM (25 °C/W) | Preferred for extended-temperature designs (>125 °C ambient); requires larger thermal pad for equivalent power dissipation. |
Compared with SMBJ120CD-M3/H, SMAJ120CA offers looser VBR control but identical mechanical fit, while SMCJ120CA trades tighter thermal resistance for higher junction temperature rating - both require validation of clamping margin against downstream IC absolute maximum ratings.
Availability
SMBJ120CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and power supply input stage designs requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ120CD-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 high-volume manufacturability.
The SMBJxxCD series targets robust, surface-mount transient suppression for industrial, telecom, and automotive applications - engineered for tight VBR tolerance, low leakage, and repeatable clamping performance under repetitive surge stress.
FAQ
What is the exact breakdown voltage range for SMBJ120CD-M3/H?
The SMBJ120CD-M3/H has a specified breakdown voltage (VBR) range of 135 V to 145 V at 1 mA test current, with ±3.5 % tolerance. This tight specification ensures consistent clamping behavior across production lots and supports precise overvoltage margining in protected circuits. The value is measured per ANSI/IEEE C62.35 standards and confirmed in Vishay's 87606 datasheet revision 09-Jan-2024.
Is SMBJ120CD-M3/H unidirectional or bidirectional?
SMBJ120CD-M3/H is a bidirectional TVS diode, indicated by the "CD" suffix per Vishay's naming convention. It provides symmetrical clamping for both positive and negative transients without polarity dependence, and carries no cathode band marking. This makes it suitable for AC-coupled lines, differential buses like RS-485 or CAN, and any application requiring dual-polarity surge suppression.
What does the "-M3/H" suffix mean in SMBJ120CD-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 configuration ensures compatibility with automated SMT placement systems and satisfies environmental compliance requirements for industrial and automotive end equipment.
Can SMBJ120CD-M3/H be used in place of a unidirectional SMBJ120D?
No - SMBJ120CD-M3/H is bidirectional and lacks polarity marking, whereas SMBJ120D is unidirectional with a cathode band. Substituting them requires circuit-level validation: bidirectional use demands symmetric placement and may alter clamping dynamics in DC-biased lines. Direct replacement is not recommended unless the application inherently requires bidirectional protection and layout accommodates non-polarized mounting.
What is the maximum allowable surge current for SMBJ120CD-M3/H?
The SMBJ120CD-M3/H supports a peak pulse current (IPPM) of 3.15 A under the standard 10/1000 μs waveform, derived from its 600 W peak pulse power rating and 190 V clamping voltage (IPPM = PPPM / VC). This value is valid at TA = 25 °C and must be derated linearly above 25 °C per Figure 2 in the Vishay 87606 datasheet - e.g., ~2.5 A at 85 °C ambient.
SMBJ120CD-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):
- 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)
SMBJ120CD-M3/H FAQ
1.How can I place an order for SMBJ120CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CD-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 SMBJ120CD-M3/H reliable?
The price and inventory of SMBJ120CD-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 SMBJ120CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ120CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CD-M3/H?
SMBJ120CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CD-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 SMBJ120CD-M3/H?
For technical support, including SMBJ120CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CD-M3/H requirements.
6.How does Aetrix verify that SMBJ120CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ120CD-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 SMBJ120CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ120CD-M3/H?
All SMBJ120CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CD-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 SMBJ120CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ120CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CD-M3/H Tags
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