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Vishay General Semiconductor - Diodes Division SMBJ12CA-E3/52
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- Part No.:
- SMBJ12CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CA-E3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:118,776
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Product details
Overview
SMBJ12CA-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 signal and power lines. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown range (VBR at 1 mA), 19.9 V maximum clamping voltage (VC) at 30.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ12CA-E3/52 datasheet, SMBJ12CA-E3/52 pinout, SMBJ12CA-E3/52 application, or SMBJ12CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and RoHS-compliant matte tin terminations suitable for automated SMT assembly.
Technical Context
This TVS diode operates symmetrically in both directions, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage (<5.0 µA at VWM) and repeatable breakdown behavior across temperature (−55 °C to +150 °C).
The device delivers fast response time (<1.0 ns) and low incremental surge resistance, achieving consistent clamping under repetitive 0.01% duty-cycle surges. Thermal resistance (RθJA = 100 °C/W) is specified for 0.2" × 0.2" copper pads, supporting reliable power dissipation up to 5.0 W at 50 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during overvoltage events |
| VC @ IPPM | 19.9 V at 30.2 A - Clamped voltage under 600 W 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPPM | 600 W - Peak pulse power handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | ≤5.0 µA - Reverse leakage current at standoff voltage; critical for low-power sensor and battery-backed circuits |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in industrial and automotive under-hood environments |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm length and 4.06 mm width; compatible with JEDEC MS-012AC |
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, rated MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects to protected line or ground return path depending on layout |
| Cathode | Transient current entry (bidirectional) | Functionally identical to Anode in CA-series devices; forms symmetrical clamping junction with Anode |
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 | Withstands IEC 61000-4-5 combination wave surges (40 Ω/12 Ω source) up to ±1 kV open-circuit / ±500 A short-circuit |
| Low clamping voltage (19.9 V) | Maintains protected ICs (e.g., 12 V logic, CAN transceivers) within safe absolute maximum ratings during surge events |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles without baking; reduces manufacturing overhead in high-volume SMT lines |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive applications; SMBJ12CA-E3/52 is commercial-grade but shares identical die and construction |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O (RS-485) lines in factory automation sensors exposed to relay switching noise and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground to clamp induced transients before they reach precision ADCs or isolated UART transceivers. Use Value: Limits voltage excursion to ≤19.9 V during 30.2 A surges, preserving signal integrity and preventing latch-up in downstream 12 V–24 V interface ICs. |
Use Scenario: Shielding Ethernet PHYs and POTS line drivers from lightning-induced surges and AC power cross-talk in DSLAM and ONU equipment. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on twisted-pair inputs, coordinated with gas discharge tubes (GDTs) for staged protection. Use Value: Fast <1 ns response captures initial surge edge; low VC/VBR ratio ensures minimal overshoot into secondary protection stages. |
| Automotive Body Control Module | Consumer USB Port Protection |
|
Use Scenario: Safeguarding LIN bus and switched 12 V power feeds in BCMs subjected to load dump (ISO 7637-2 Pulse 5a) and ISO 10605 ESD. IC Role / Device Role / Timing Role: Secondary clamping device downstream of upstream GDTs or polymer PTCs, absorbing residual energy after coarse filtering. Use Value: Withstands repetitive 600 W pulses at 0.01% duty cycle; thermal resistance (RθJA = 100 °C/W) enables sustained operation in sealed enclosures. |
Use Scenario: Guarding USB 2.0 D+/D− lines and VBUS against ESD (±15 kV air, ±8 kV contact) and hot-swap transients in portable chargers and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (typ. 150 pF at 0 V) bidirectional clamp placed directly at connector, minimizing stub inductance. Use Value: Sub-20 V clamping prevents damage to USB transceivers rated for 3.6 V absolute max on data lines when used with series impedance matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same thermal and surge performance | No functional difference; selected where halogen-free compliance is mandated by end-equipment environmental policies | Choose SMBJ12CA-M3/52 when halogen-free material declaration is required for final product certification. |
| SMCJ12CA-E3/52 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM and lower RθJA (50 °C/W) | Higher surge margin and better thermal performance; requires larger PCB footprint and different pad layout | Choose SMCJ12CA-E3/52 when system-level surge testing exceeds 600 W or board layout allows SMC footprint. |
Compared with SMBJ12CA-E3/52, SMBJ12CA-M3/52 offers identical protection performance with halogen-free construction, while SMCJ12CA-E3/52 provides 2.5× higher surge power handling in a larger package - enabling design flexibility for varying reliability targets and PCB space constraints.
Availability
SMBJ12CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, RoHS compliance, and MSL Level 1 manufacturability.
Supply support for SMBJ12CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered for robust, low-clamp transient suppression in space-constrained surface-mount applications across industrial, telecom, and automotive sectors.
FAQ
What is the standoff voltage rating of SMBJ12CA-E3/52?
The SMBJ12CA-E3/52 has a maximum reverse standoff voltage (VWM) of 12 V, meaning it remains in high-impedance state below this voltage and begins clamping only when transients exceed its breakdown range of 13.3–14.7 V. This rating ensures compatibility with 12 V nominal systems while maintaining low leakage (<5.0 µA) during normal operation - a key parameter verified in Vishay's 88392 datasheet.
Is SMBJ12CA-E3/52 suitable for bidirectional signal line protection?
Yes, SMBJ12CA-E3/52 is explicitly designed as a bidirectional TVS diode, with symmetrical clamping characteristics in both polarities. Its CA suffix confirms bidirectional functionality, and electrical specifications (VBR, VC, IPPM) apply identically in either direction - making it ideal for protecting RS-485, CAN, or audio differential pairs without polarity concerns.
What is the maximum clamping voltage of SMBJ12CA-E3/52 under surge conditions?
The SMBJ12CA-E3/52 clamps to a maximum of 19.9 V when subjected to its rated 30.2 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number 88392), and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does SMBJ12CA-E3/52 meet moisture sensitivity requirements for lead-free reflow?
Yes, SMBJ12CA-E3/52 is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This allows indefinite floor life and compatibility with standard lead-free reflow profiles without pre-baking - confirmed in the "Mechanical Data" section of the Vishay SMBJ5.0A–SMBJ188A datasheet.
How does SMBJ12CA-E3/52 differ from the unidirectional SMBJ12A-E3/52?
SMBJ12CA-E3/52 is bidirectional with symmetrical clamping, while SMBJ12A-E3/52 is unidirectional and features a cathode band marking. Their VWM (12 V) and VBR (13.3–14.7 V) match, but SMBJ12A-E3/52 conducts forward surge current (IFSM = 100 A) and exhibits forward voltage drop (VF ≤ 3.5 V at 50 A), whereas SMBJ12CA-E3/52 has no defined forward conduction path - a distinction critical for AC vs. DC line protection.
SMBJ12CA-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 30.2A
- 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)
SMBJ12CA-E3/52 FAQ
1.How can I place an order for SMBJ12CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CA-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 SMBJ12CA-E3/52 reliable?
The price and inventory of SMBJ12CA-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 SMBJ12CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ12CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CA-E3/52?
SMBJ12CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CA-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 SMBJ12CA-E3/52?
For technical support, including SMBJ12CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ12CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ12CA-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 SMBJ12CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ12CA-E3/52?
All SMBJ12CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CA-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 SMBJ12CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ12CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CA-E3/52 Tags
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