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Vishay General Semiconductor - Diodes Division SMBJ120CA-E3/5B
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- Part No.:
- SMBJ120CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CA-E3/5B.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,902
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Product details
Overview
SMBJ120CA-E3/5B 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 signal or power lines. It features a 120 V stand-off voltage (VWM), 133–147 V breakdown voltage (VBR) at 1 mA, 193 A peak pulse current (IPPM) with 10/1000 µs waveform, and 600 W peak pulse power dissipation - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ120CA-E3/5B datasheet, SMBJ120CA-E3/5B pinout, SMBJ120CA-E3/5B application, or SMBJ120CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping voltage (VC = 193 V max at IPPM), RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, enabling transient suppression without polarity constraints on AC-coupled or differential signal paths. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), while the low incremental surge resistance supports effective energy diversion during ESD or lightning-induced surges.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and meets UL 497B recognition (QVGQ2) for protector classification. Thermal resistance is rated at RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 120 V nominal systems. |
| VBR (min/max) | 133 V / 147 V at IT = 1 mA - guaranteed breakdown range ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 193 V max at 193 A - clamping voltage under 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W - peak pulse power handling capacity with 0.01% duty cycle; enables robust protection against repetitive transients. |
| IPPM | 193 A - peak surge current rating with 10/1000 µs waveform; defines minimum surge immunity level for system-level IEC 61000-4-5 testing. |
| Junction Temp Range | –55 °C to +150 °C - supports deployment in automotive under-hood, industrial motor drives, and outdoor telecom equipment. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 0.205" × 0.130" footprint; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, qualified to JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts surge current during negative voltage excursions; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive half-cycle) | Conducts surge current during positive voltage excursions; paired with anode to enable bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns. |
| 600 W peak pulse power | Supports compliance with IEC 61000-4-5 Level 4 (4 kV/2 Ω) when properly mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 130 V-rated gate drivers or analog front-ends. |
| MSL Level 1, 260 °C reflow compatible | Allows standard lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk. |
| RoHS-compliant, matte tin terminations | Ensures reliable solder joint formation and long-term intermetallic stability in high-reliability industrial environments. |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
Use Scenario: Protection of gate driver inputs and feedback sensing lines against switching-induced transients in 3-phase inverters. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector or IC input pins. Use Value: Limits transient voltage to ≤193 V, preventing latch-up or oxide damage in isolated gate drivers operating near 120 V bus rails. |
Use Scenario: Surge protection on T1/E1 interface transformers and line-side PHY circuits exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level transient suppressor on balanced differential pairs prior to transformer coupling. Use Value: Clamps common-mode surges up to 600 W without polarity biasing, preserving signal integrity on 120 V RMS telecom lines. |
| Automotive Body Control Modules | Industrial PLC Analog Inputs |
Use Scenario: Input protection for LIN bus transceivers and load switch control lines subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary-level clamp after primary LC filtering, absorbing residual energy from coupled transients. Use Value: Withstands 193 A surge current and operates up to +150 °C, meeting AEC-Q101 requirements when specified as HE3/HM3 variant. |
Use Scenario: Protection of 4–20 mA current loop receivers and precision ADC inputs against field-wiring induced EFT and surge events. IC Role / Device Role / Timing Role: Low-leakage (ID ≤ 1 µA at VWM) shunt suppressor placed upstream of instrumentation amplifier inputs. Use Value: Maintains <1 µA reverse leakage at 120 V, avoiding measurement offset errors while clamping fast transients below 193 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure). | Direct substitution if halogen-free certification is required; same thermal and clamping performance. |
| SMAJ120CA-E3/61 | Lower power rating: 400 W PPPM, 129 A IPPM, SMA (DO-214AC) package with smaller footprint (0.165" × 0.130"). | Reduced surge handling limits suitability to lower-energy interfaces (e.g., USB, CAN) rather than 120 V power rails. | Use only where board space is constrained and surge threat level is ≤400 W; not suitable for IEC 61000-4-5 Level 4. |
Compared with SMBJ120CA-E3/5B, the M3/5B variant offers identical protection performance with halogen-free construction, while the SMAJ120CA-E3/61 trades 33 % lower pulse power and smaller size for space-constrained designs where full 600 W capability is unnecessary.
Availability
SMBJ120CA-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, automotive body control modules, and PLC analog input protection requiring stable component supply and verified surge immunity.
Supply support for SMBJ120CA-E3/5B 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, MOSFETs, and transient protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial, automotive, and telecom applications where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ120CA-E3/5B at its rated peak pulse current?
The SMBJ120CA-E3/5B has a maximum clamping voltage (VC) of 193 V when subjected to its rated 193 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ120CA-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ120CA-E3/5B suitable for automotive applications?
The SMBJ120CA-E3/5B itself is commercial-grade (E3 suffix); however, Vishay offers AEC-Q101-qualified versions under ordering codes like SMBJ120CAHE3_B/I. For automotive use, specify the HE3 or HM3 variant - the SMBJ120CA-E3/5B is not AEC-Q101 qualified but shares identical electrical characteristics and SMB package dimensions with qualified variants.
How does the bidirectional design of SMBJ120CA-E3/5B affect PCB layout?
The SMBJ120CA-E3/5B has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout for differential signal lines (e.g., RS-485, CAN) and AC-coupled circuits, reducing assembly errors and enabling symmetric routing. Its SMB (DO-214AA) footprint requires 0.2" × 0.2" copper pads per terminal for optimal thermal and surge performance.
What is the maximum reverse leakage current of SMBJ120CA-E3/5B at its stand-off voltage?
At its 120 V stand-off voltage (VWM) and TA = 25 °C, the SMBJ120CA-E3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage preserves signal integrity in high-impedance analog or communication circuits and avoids loading effects on precision voltage references or current-loop receivers.
Can SMBJ120CA-E3/5B be used in place of a unidirectional TVS like SMBJ120A-E3/5B?
No - SMBJ120CA-E3/5B is bidirectional and lacks polarity marking, while SMBJ120A-E3/5B is unidirectional with cathode band identification. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC or floating lines; unidirectional is required for DC rails with defined ground reference. Their VBR, VC, and PPPM values differ slightly due to test condition variations, so direct interchange is not recommended without system-level validation.
SMBJ120CA-E3/5B 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:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ120CA-E3/5B FAQ
1.How can I place an order for SMBJ120CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CA-E3/5B 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 SMBJ120CA-E3/5B reliable?
The price and inventory of SMBJ120CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ120CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CA-E3/5B?
SMBJ120CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CA-E3/5B 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 SMBJ120CA-E3/5B?
For technical support, including SMBJ120CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ120CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ120CA-E3/5B 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 SMBJ120CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ120CA-E3/5B?
All SMBJ120CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CA-E3/5B, 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 SMBJ120CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ120CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CA-E3/5B Tags
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