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Vishay General Semiconductor - Diodes Division SMBJ120CA-E3/52
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- Part No.:
- SMBJ120CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CA-E3/52.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,360
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Product details
Overview
SMBJ120CA-E3/52 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), and clamps to ≤193 V at 3.1 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ120CA-E3/52 datasheet, SMBJ120CA-E3/52 pinout, SMBJ120CA-E3/52 application, or SMBJ120CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, 193 V maximum clamping voltage at rated IPPM, thermal resistance (RθJA = 100 °C/W), and compliance with AEC-Q101 qualification options via HE3/HM3 variants.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling transient suppression without polarity sensitivity on AC-coupled or floating lines. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM), while the 10/1000 µs waveform rating reflects standardized lightning-surge immunity testing per ANSI/IEEE C62.35.
The device delivers 600 W peak pulse power with 0.01% duty cycle repeatability and exhibits fast response time (<1.0 ns), low incremental surge resistance, and meets MSL Level 1 (260 °C reflow). Junction temperature range spans –55 °C to +150 °C, supporting operation in harsh industrial and automotive environments when paired with appropriate PCB copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - maximum continuous reverse stand-off voltage before significant conduction begins |
| VBR min/max | 133 V / 147 V at IT = 1 mA - guaranteed breakdown range defining clamping onset threshold |
| VC @ IPPM | 193 V at 3.1 A - maximum clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - peak transient energy absorption capacity under standard lightning-surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - enables reliable operation in high-temperature enclosures and under sustained load |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts surge current during negative half-cycle; connects to protected line or ground return path |
| Cathode | Transient current entry (positive polarity) | Accepts surge current during positive half-cycle; connects to protected line or ground return path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC or floating DC lines without external polarity management |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to downstream ICs such as RS-485 transceivers or microcontroller I/O |
| MSL Level 1 (260 °C) | Supports standard lead-free reflow without moisture-related popcorning or delamination |
| AEC-Q101 qualified option | HE3/HM3 suffix variants meet automotive-grade reliability requirements for engine control and body electronics |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA loops) from ESD and inductive switching transients in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return lines to clamp ±1 kV contact ESD and 400 V ring-wave surges. Use Value: Limits voltage excursion to ≤193 V, preventing damage to precision DACs or op-amps while maintaining loop accuracy. |
Use Scenario: Shielding RS-232/RS-485 data lines in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on differential bus lines, coordinated with common-mode chokes. Use Value: Absorbs 600 W surge energy within nanoseconds, preserving signal integrity and avoiding latch-up in UART peripherals. |
| Automotive Body Control Module | AC-DC Power Supply Input |
|
Use Scenario: Safeguarding LIN bus nodes and switch inputs in door modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamp on 12 V supply rail and LIN signal line, operating alongside upstream fuse and choke. Use Value: Clamps 100 V transients to <193 V within <1 ns, meeting AEC-Q101 stress test margins for long-term field reliability. |
Use Scenario: Secondary-side overvoltage protection on 120 VAC-derived DC rails in industrial SMPS designs. IC Role / Device Role / Timing Role: Fast-acting shunt device across bulk capacitor to prevent overvoltage failure during rectifier diode failure or surge events. Use Value: Activates before electrolytic capacitor rupture limit (typically 200–250 V), extending system uptime and reducing field returns. |
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-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package | No difference in circuit function or layout; selected where halogen-free material compliance is mandated | Choose when environmental compliance (IEC 61249-2-21) overrides cost or sourcing preference |
| SMBJ120AHE3_B/I | AEC-Q101 qualified, RoHS-compliant, 13" tape-and-reel packaging; same VWM/VBR/VC ratings | Required for automotive OEM BOMs needing PPAP documentation and extended temperature validation | Specify when qualifying for automotive Tier-1 programs or requiring traceable lot-level reliability data |
Compared with SMBJ120CA-E3/52, the M3 variant adds halogen-free construction without altering surge performance, while the HE3 variant provides full automotive qualification - enabling drop-in use in commercial designs or mandatory upgrade for automotive deployment.
Availability
SMBJ120CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and AC-DC power supply input circuits requiring stable component supply, consistent surge performance, and RoHS-compliant manufacturing.
Supply support for SMBJ120CA-E3/52 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 optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where repeatable clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of SMBJ120CA-E3/52 under standard surge conditions?
The SMBJ120CA-E3/52 clamps to a maximum of 193 V when subjected to its rated 3.1 A peak pulse current (IPPM) using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ120CA-E3/52 suitable for automotive applications?
SMBJ120CA-E3/52 itself is commercial-grade and not AEC-Q101 qualified; however, the functionally identical SMBJ120CAHE3_B/I variant is fully AEC-Q101 qualified. For automotive use, specify the HE3 or HM3 suffix versions - they share identical electrical characteristics but include extended reliability testing, traceability, and PPAP documentation required by Tier-1 suppliers.
How does the bidirectional design of SMBJ120CA-E3/52 affect PCB layout?
The SMBJ120CA-E3/52 has no polarity marking and symmetrical terminal behavior, so PCB layout requires no orientation constraint - either end may connect to the protected line or return path. This simplifies placement in AC-coupled or floating systems like RS-485 buses or transformer-isolated supplies, eliminating risk of reverse installation errors during automated assembly.
What thermal derating applies to SMBJ120CA-E3/52 above 25 °C ambient?
SMBJ120CA-E3/52 follows the derating curve in Figure 2 of Vishay document 88392: peak pulse power decreases linearly above 25 °C, reaching ~50% of 600 W at TJ = 100 °C. Designers must ensure junction temperature stays ≤150 °C using the RθJA = 100 °C/W rating and appropriate copper pad area (0.2" × 0.2" minimum per terminal) to maintain surge capability across operating temperature ranges.
Can SMBJ120CA-E3/52 replace unidirectional TVS diodes in existing designs?
No - SMBJ120CA-E3/52 is strictly bidirectional and lacks cathode band marking; substituting it for a unidirectional part (e.g., SMBJ120A) would compromise forward-bias conduction paths in DC circuits. Use only where bidirectional clamping is explicitly required, such as AC lines, differential buses, or floating grounds. For DC rail protection, select the unidirectional SMBJ120A-E3/52 instead.
SMBJ120CA-E3/52 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-E3/52 FAQ
1.How can I place an order for SMBJ120CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CA-E3/52 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-E3/52 reliable?
The price and inventory of SMBJ120CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ120CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CA-E3/52?
SMBJ120CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CA-E3/52 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-E3/52?
For technical support, including SMBJ120CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ120CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ120CA-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ120CA-E3/52?
All SMBJ120CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CA-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ120CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ120CA-E3/52 Tags
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