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Vishay General Semiconductor - Diodes Division SMBJ120A-M3/5B
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- Part No.:
- SMBJ120A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120A-M3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,069
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Product details
Overview
SMBJ120A-M3/5B 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-M3/5B datasheet, SMBJ120A-M3/5B pinout, SMBJ120A-M3/5B application, or SMBJ120A-M3/5B 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 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 its breakdown threshold (133–147 V), it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at 120 V) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O in high-speed switching environments.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2; its 20 °C/W junction-to-lead thermal resistance supports localized heat dissipation into PCB copper, while MSL Level 1 moisture sensitivity enables standard reflow without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 120 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 120 V DC rail protection. |
| VBR (Breakdown) | 133–147 V at 1.0 mA - Confirmed avalanche initiation range; defines minimum overvoltage threshold for clamping action. |
| VC (Clamping) | 193 V at IPPM = 3.1 A - Measured peak voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates capability against IEC 61000-4-5 Level 4 surges. |
| ID (Leakage) | ≤1.0 µA at 120 V - Ultra-low reverse leakage preserves efficiency in always-on power monitoring circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without forced cooling. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with cathode band marking; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes shunt path during avalanche conduction. |
| Cathode | High-side input terminal | Connected to protected line (e.g., 120 V rail); polarity band identifies this terminal for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Validated clamping performance under IEC 61000-4-5 10/1000 µs surge waveforms up to 3.1 A. |
| Glass passivated junction | Ensures stable VBR tolerance (±5 % typical) and long-term reliability across temperature cycling. |
| MSL Level 1 rating | Permits standard Pb-free reflow (peak 260 °C) without pre-bake, reducing manufacturing complexity. |
| Halogen-free construction | M3 suffix confirms compliance with IEC 61249-2-21; eliminates brominated flame retardants in molding compound. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive gate drivers. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 120 V DC bus against inductive kickback from IGBT gate drivers and relay coils. IC Role / Device Role / Timing Role: Shunt TVS placed directly across bus capacitor to clamp >150 V spikes within nanoseconds. Use Value: Limits voltage excursion to ≤193 V, preventing gate oxide rupture in 200 V-rated MOSFETs and maintaining system uptime. |
Use Scenario: Input-stage surge suppression on AC/DC front-end rectifiers feeding 120 V intermediate bus. IC Role / Device Role / Timing Role: Primary-level transient suppressor absorbing lightning-induced surges per IEC 61000-4-5. Use Value: Withstands 600 W pulses without degradation, enabling single-stage protection architecture and reducing BOM count. |
| Automotive Body Control Modules | Industrial PLC I/O Cards |
Use Scenario: Protection of LIN bus transceivers and power window motor drivers exposed to load dump events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, triggered only on positive overvoltage. Use Value: 120 V VWM provides 20 % margin above nominal 100 V battery systems, meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Field-side protection of analog input channels (e.g., 4–20 mA loops) connected to 120 V-powered sensor hubs. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) shunt element preserving measurement accuracy while blocking transients. Use Value: Prevents false triggering of ADC references during ESD events, maintaining ±0.1 % reading stability. |
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-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade non-automotive use where halogen-free mandate does not apply. | Select E3 if halogen content is unrestricted and cost is prioritized over green compliance. |
| SMBJ120AHM3_B/I | Identical electrical and thermal specs; HM3 denotes AEC-Q101 qualification + halogen-free; "B/I" indicates 13″ reel packaging. | Required for automotive ECUs needing automotive-grade qualification and traceability. | Choose HM3_B/I when qualifying for automotive production or requiring full AEC-Q101 documentation. |
Compared with SMBJ120A-M3/5B, the E3 variant trades halogen-free status for lower cost in commercial designs, while the HM3_B/I adds AEC-Q101 validation and different reel size - making SMBJ120A-M3/5B the optimal balance of green compliance, industrial reliability, and standard 13″ reel logistics.
Availability
SMBJ120A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply with halogen-free compliance and MSL Level 1 reflow readiness.
Supply support for SMBJ120A-M3/5B 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, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SMBJ series was engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where failure resilience and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMBJ120A-M3/5B at its rated peak pulse current?
The SMBJ120A-M3/5B has a maximum clamping voltage (VC) of 193 V when subjected to its rated peak pulse current (IPPM) of 3.1 A using a 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet 88392 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-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ120A-M3/5B suitable for automotive applications?
SMBJ120A-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified; it carries the M3 suffix indicating commercial-grade qualification only. For automotive applications requiring formal qualification, Vishay offers the SMBJ120AHM3_B/I variant with AEC-Q101 certification. The SMBJ120A-M3/5B remains appropriate for non-safety-critical automotive subsystems such as infotainment power rails where AEC-Q101 is not mandated - however, design-in requires explicit customer validation per ISO 16750-2. The SMBJ120A-M3/5B itself does not carry automotive qualification documentation.
How does the M3 suffix differ from E3 in SMBJ120A-M3/5B?
The M3 suffix in SMBJ120A-M3/5B denotes halogen-free, RoHS-compliant construction using bromine-free flame retardants in the epoxy molding compound, whereas E3 indicates RoHS compliance without halogen-free assurance. Both share identical electrical characteristics, thermal ratings, and package dimensions. The SMBJ120A-M3/5B meets IEC 61249-2-21 for halogen content (<900 ppm bromine, <900 ppm chlorine), making it suitable for green electronics initiatives where E3 would fail compliance audits. Packaging (5B = 13″ reel, 3200 pcs) is identical between M3 and E3 variants.
What is the thermal resistance of SMBJ120A-M3/5B, and how does it affect layout?
SMBJ120A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal, and a junction-to-lead resistance (RθJL) of 20 °C/W. This means PCB copper area directly impacts power handling: reducing pad size increases RθJA and risks thermal runaway during repetitive surges. For reliable 5.0 W steady-state dissipation, designers must allocate ≥5.0 mm² copper per pad and consider internal ground planes. The SMBJ120A-M3/5B's thermal profile is validated only with the specified pad layout - deviations require derating per Figure 2 in datasheet 88392.
Can SMBJ120A-M3/5B be used in bidirectional protection circuits?
No - SMBJ120A-M3/5B is a unidirectional TVS diode, identifiable by its cathode band marking and specified only for reverse-biased operation. Bidirectional protection requires the CA-suffixed variant (e.g., SMBJ120CA), which exhibits symmetrical clamping in both polarities. Using SMBJ120A-M3/5B in bidirectional applications risks forward conduction during negative transients, potentially damaging the device or failing to suppress. The SMBJ120A-M3/5B datasheet explicitly states "unidirectional" in the PRIMARY CHARACTERISTICS table and prohibits bidirectional use without external series components - which are not recommended due to added complexity and timing mismatch.
SMBJ120A-M3/5B 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-M3/5B FAQ
1.How can I place an order for SMBJ120A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120A-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ120A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120A-M3/5B?
SMBJ120A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120A-M3/5B 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-M3/5B?
For technical support, including SMBJ120A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120A-M3/5B requirements.
6.How does Aetrix verify that SMBJ120A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120A-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120A-M3/5B?
All SMBJ120A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120A-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ120A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120A-M3/5B Tags
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