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Vishay General Semiconductor - Diodes Division SMBJ12CA/54
- Part No.:
- SMBJ12CA/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CA/54.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,939
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Product details
Overview
SMBJ12CA/54 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps transients to ≤19.9 V at 30.2 A, making it suitable for protecting MOSFETs, ICs, and sensor interfaces against inductive switching surges.
For engineers reviewing the SMBJ12CA/54 datasheet, SMBJ12CA/54 pinout, SMBJ12CA/54 application, or SMBJ12CA/54 equivalent, key selection criteria include bidirectional clamping capability, SMB (DO-214AA) package compatibility with automated SMT assembly, low leakage (<5 µA at VWM), and AEC-Q101 qualification availability for automotive-grade variants.
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 breakdown characteristics and low incremental surge resistance, while the 100 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB pad conditions.
The device responds within picoseconds to transient events and maintains clamping performance across repetitive 0.01% duty-cycle pulses. It meets UL 497B recognition and complies with J-STD-020 MSL Level 1, supporting lead-free reflow profiles with peak temperatures up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 19.9 V at 30.2 A - Clamped voltage during 600 W transient event; determines maximum stress imposed on downstream components. |
| PPPM | 600 W (10/1000 µs waveform) - Peak surge energy handling capacity; validates suitability for industrial load-switching transients. |
| ID @ VWM | <5 µA - Reverse leakage current at standoff voltage; minimizes standby power loss and avoids false triggering. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm max length; compatible with high-speed pick-and-place equipment. |
| TJ max | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive or high-ambient industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional construction with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output for bidirectional clamping; no cathode band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded lines without polarity concerns. |
| 600 W peak pulse power | Handles high-energy transients from relay coil decay or motor commutation without degradation under rated conditions. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during suppression, reducing stress on sensitive downstream ICs and MOSFET gates. |
| MSL Level 1 moisture sensitivity | Eliminates bake requirements prior to reflow, streamlining manufacturing and reducing process risk. |
| AEC-Q101 qualified option | Available with HE3/HM3 suffixes for automotive applications requiring validated reliability and extended temperature operation. |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback circuits in variable-frequency drives exposed to inductive kickback from IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC bus or gate-source nodes to clamp voltage spikes before they reach control ICs. Use Value: Limits transient voltage to ≤19.9 V, preventing gate oxide damage and latch-up in 12 V-rated logic-level MOSFETs. |
Use Scenario: ESD and load-dump protection for LIN/CAN sensor modules (e.g., pressure, temperature) connected to vehicle battery rails. IC Role / Device Role / Timing Role: Primary front-end suppressor on power input and signal lines, absorbing ISO 7637-2 Pulse 1/2/5a events. Use Value: Withstands 100 A surge (IFSM) and clamps 600 W transients, meeting OEM requirements for Class D sensor robustness. |
| Consumer Power Adapter | Telecom Line Card |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters subjected to lightning-induced surges on output USB or 12 V rails. IC Role / Device Role / Timing Role: Fast-response shunt device placed parallel to DC output capacitors to limit post-regulator overvoltage. Use Value: Sub-20 V clamping ensures compliance with USB PD 3.1 and IEC 62368-1 secondary circuit safety limits. |
Use Scenario: Protection of Ethernet PHY interfaces and analog line drivers in DSL/fiber access equipment exposed to induced surges on copper pairs. IC Role / Device Role / Timing Role: Differential-mode suppressor across twisted-pair inputs, leveraging bidirectional symmetry for balanced line protection. Use Value: Low capacitance (typ. <100 pF at 0 V) preserves signal integrity up to 100 Mbps without jitter or attenuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52 | Same electrical specs and SMB package; RoHS-compliant commercial-grade variant without AEC-Q101 qualification. | Intended for non-automotive industrial or consumer applications where automotive reliability certification is not required. | Select when cost-sensitive volume production prioritizes standard commercial qualification over automotive grade. |
| SAC12 | Lower 400 W PPPM, same VWM = 12 V, but in smaller SOD-123 package (lower surge current handling). | Targeted at space-constrained portable electronics; insufficient for 600 W industrial transients. | Choose only for low-energy ESD-only scenarios where board area is critical and peak surge energy remains below 400 W. |
Compared with SMBJ12CA/54, SMBJ12CA-E3/52 offers identical protection performance with simplified qualification, while SAC12 trades surge capacity and thermal robustness for footprint reduction - neither is pin-compatible due to differing package outlines (SMB vs. SOD-123), requiring layout revision.
Availability
SMBJ12CA/54 is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, and telecom line card designs requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for SMBJ12CA/54 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 SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems demanding robust, standardized, and AEC-Q101-capable TVS solutions.
FAQ
What is the clamping voltage of SMBJ12CA/54 at its rated peak pulse current?
The SMBJ12CA/54 clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 30.2 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ12CA/54 maintains this clamping performance across its specified operating temperature range.
Is SMBJ12CA/54 unidirectional or bidirectional, and how does that affect its circuit placement?
SMBJ12CA/54 is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities without cathode marking. This allows placement across AC-coupled lines, differential signal pairs, or floating power domains without orientation constraints. Unlike unidirectional variants (e.g., SMBJ12A), the SMBJ12CA/54 does not require alignment to ground or supply rails, simplifying layout for balanced protection schemes.
Does SMBJ12CA/54 meet automotive qualification standards?
The base SMBJ12CA/54 part is commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes such as SMBJ12CAHE3_B/H or SMBJ12CAHM3_B/I. These variants undergo stress testing per AEC-Q101 and are intended for automotive applications including body control modules and sensor interfaces. The SMBJ12CA/54 itself is not automatically AEC-Q101 qualified unless ordered with HE3 or HM3 suffixes.
What is the maximum steady-state power dissipation of SMBJ12CA/54?
The SMBJ12CA/54 has a maximum steady-state power dissipation (PD) of 5.0 W at ambient temperature (TA) = 50 °C with infinite heatsink conditions. In typical PCB layouts using 0.2" × 0.2" copper pads per terminal, derating applies above 25 °C ambient - the SMBJ12CA/54 is not intended for continuous power dissipation but for transient suppression only.
How does the SMBJ12CA/54 compare to SMAJ12CA in terms of surge handling?
SMBJ12CA/54 delivers 600 W peak pulse power (10/1000 µs), whereas SMAJ12CA is rated for 400 W under the same waveform. The larger SMB package of SMBJ12CA/54 provides lower thermal resistance (RθJA = 100 °C/W vs. ~130 °C/W for SMAJ), enabling higher surge current tolerance (30.2 A vs. ~20 A) and improved reliability in high-energy industrial environments. The SMBJ12CA/54 is not a drop-in replacement for SMAJ12CA due to different package dimensions and pad layouts.
SMBJ12CA/54 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/54 FAQ
1.How can I place an order for SMBJ12CA/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CA/54 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/54 reliable?
The price and inventory of SMBJ12CA/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CA/54 is usually 5 days.
3.What payment methods are accepted for SMBJ12CA/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CA/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CA/54?
SMBJ12CA/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CA/54 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/54?
For technical support, including SMBJ12CA/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CA/54 requirements.
6.How does Aetrix verify that SMBJ12CA/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ12CA/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ12CA/54?
All SMBJ12CA/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CA/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ12CA/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CA/54 Tags
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