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Vishay General Semiconductor - Diodes Division SMBJ120CAHE3_B/I
- Part No.:
- SMBJ120CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHE3_B/I.pdf
- Description:
- 600W,120V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,336
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Product details
Overview
SMBJ120CAHE3_B/I 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), 133–147 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), 3.1 A peak pulse current (IPPM), and clamps to ≤193 V at rated surge. It protects MOSFETs and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ120CAHE3_B/I datasheet, SMBJ120CAHE3_B/I pinout, SMBJ120CAHE3_B/I application, or SMBJ120CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B for protector classification.
Technical Context
This device operates as a voltage-clamped transient suppressor using an avalanche breakdown mechanism. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints. The glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Designed for automated SMT assembly, it meets J-STD-020 MSL Level 1 (260 °C peak reflow) and JESD 201 Class 2 whisker resistance. The matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, and the molding compound complies with UL 94 V-0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | ≤193 V at IPPM - Peak voltage seen by protected circuit during 600 W transient; determines maximum stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs waveform) - Surge energy handling capacity under standardized lightning-like stress profile. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Enables reliable operation in under-hood automotive or enclosed industrial environments. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to line being protected. |
| Cathode | Transient current exit (bidirectional) | Completes surge path to ground or return rail; electrically identical to Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity-sensitive layout. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (e.g., 4 kV line-to-ground) when properly mounted. |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial communication interfaces requiring certified surge protection. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns; eliminates bake-out requirement. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback sensing lines against inductive kickback from relay coils and solenoids. IC Role / Device Role: Bidirectional TVS placed across MOSFET gate-source or op-amp input pins. Use Value: Limits transient voltage to ≤193 V, preventing gate oxide rupture and analog front-end saturation. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role: Primary clamping element on 12 V power distribution nodes feeding microcontrollers and CAN transceivers. Use Value: Maintains <1.0 µA leakage at 12 V nominal, minimizing quiescent current in always-on modules. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for PoE-powered equipment subjected to lightning-induced surges on Ethernet pairs. IC Role / Device Role: Secondary-level TVS after primary gas discharge tube, absorbing residual energy in differential mode. Use Value: Clamps to ≤193 V within nanoseconds, preserving PHY ICs rated for 200 V absolute maximum. |
Use Scenario: Overvoltage safeguard on microcontroller I/O lines connected to pushbuttons, encoders, and display backlights. IC Role / Device Role: Low-capacitance (<50 pF typical) transient suppressor placed directly at connector entry points. Use Value: Prevents latch-up and ESD damage while adding negligible signal delay to 10 kHz control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-M3 | Halogen-free, RoHS-compliant, same electrical specs and AEC-Q101 qualification; differs only in plating chemistry (HM3 vs HE3). | No functional difference in surge performance or thermal behavior; suitable for halogen-free BOM mandates. | Select SMBJ120CA-M3 when halogen-free compliance is required and lead finish compatibility with legacy solder pastes is confirmed. |
| SMBJ120AHE3_B/I | Unidirectional version: cathode-marked, VF = 3.5 V max. at 50 A; lacks reverse conduction path. | Requires polarity-aware layout; unsuitable for AC or floating differential lines where bidirectional clamping is mandatory. | Choose SMBJ120AHE3_B/I only for DC-biased unidirectional rails where forward voltage drop must be minimized. |
Compared with SMBJ120CAHE3_B/I, the M3 variant offers identical protection performance with halogen-free construction, while the unidirectional SMBJ120AHE3_B/I requires polarity alignment and cannot protect symmetric signal paths-making the CA version essential for robustness in mixed-signal or automotive domains.
Availability
SMBJ120CAHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer appliance control boards requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ120CAHE3_B/I 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 validation.
The SMBJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where repeatable clamping and long-term stability are critical.
FAQ
What does the "CA" suffix indicate in SMBJ120CAHE3_B/I?
The "CA" suffix denotes a bidirectional configuration: SMBJ120CAHE3_B/I conducts and clamps symmetrically in both directions, unlike unidirectional variants (e.g., SMBJ120A). This makes SMBJ120CAHE3_B/I ideal for protecting AC-coupled lines, differential buses, or floating sensors where polarity is undefined or reversible. No band marking is present on the SMB package.
Is SMBJ120CAHE3_B/I qualified for automotive applications?
Yes, SMBJ120CAHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" (RoHS-compliant and AEC-Q101 qualified). It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD robustness, making SMBJ120CAHE3_B/I suitable for under-hood and body electronics in passenger vehicles and commercial fleets.
What is the maximum clamping voltage of SMBJ120CAHE3_B/I at its rated surge current?
The maximum clamping voltage (VC) of SMBJ120CAHE3_B/I is 193 V at its rated peak pulse current (IPPM) of 3.1 A, measured under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-power transient event, ensuring downstream ICs remain within their absolute maximum ratings.
How does SMBJ120CAHE3_B/I differ from SMBJ120AHE3_B/I?
SMBJ120CAHE3_B/I is bidirectional with symmetrical clamping in both polarities and no polarity marking, whereas SMBJ120AHE3_B/I is unidirectional, marked with a cathode band, and exhibits forward voltage drop (VF ≤ 3.5 V at 50 A). SMBJ120CAHE3_B/I supports AC and differential protection; SMBJ120AHE3_B/I is limited to DC-biased unidirectional rails.
What PCB pad layout is recommended for optimal thermal performance of SMBJ120CAHE3_B/I?
Vishay specifies mounting SMBJ120CAHE3_B/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the published RθJA of 100 °C/W. Reducing pad area increases thermal resistance and reduces surge current derating; increasing copper area improves heat dissipation but requires verification against board space and routing constraints in the final SMBJ120CAHE3_B/I layout.
SMBJ120CAHE3_B/I 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):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 3.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ120CAHE3_B/I FAQ
1.How can I place an order for SMBJ120CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHE3_B/I 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 SMBJ120CAHE3_B/I reliable?
The price and inventory of SMBJ120CAHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHE3_B/I?
SMBJ120CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHE3_B/I 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 SMBJ120CAHE3_B/I?
For technical support, including SMBJ120CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ120CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHE3_B/I 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 SMBJ120CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHE3_B/I?
All SMBJ120CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHE3_B/I, 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 SMBJ120CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ120CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CAHE3_B/I Tags
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