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Taiwan Semiconductor Corporation SMBJ30CA
- Part No.:
- SMBJ30CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CA.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:21,523
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Product details
Overview
SMBJ30CA from Taiwan Semiconductor is a bidirectional 30V standoff transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power with 48.4V clamping voltage at 13.0A peak current, designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ30CA datasheet, SMBJ30CA pinout, SMBJ30CA application, or SMBJ30CA equivalent, this page delivers verified clamping performance, bidirectional surge immunity, JEDEC-compliant thermal resistance (RθJA = 55°C/W), and RoHS/halogen-free compliance per IEC 61249-2-21 - critical for ESD and inductive switching protection in embedded control modules.
Technical Context
The SMBJ30CA employs a glass-passivated silicon junction optimized for sub-1ps response time and low leakage (<1μA at 30V), enabling effective suppression of fast electrical fast transients (EFT) and electrostatic discharge events. Its bidirectional configuration eliminates polarity concerns in AC-coupled or floating signal lines.
With a 150°C maximum junction temperature and JESD201 Class 2 whisker resistance, SMBJ30CA supports operation in under-hood automotive environments and industrial motor drives where thermal cycling and mechanical reliability are essential. The DO-214AA package provides 0.090g mass and UL 94V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V working stand-off voltage - blocks normal system voltage up to 30V DC without conduction. |
| VBR min/max | 33.3 V / 36.8 V breakdown range at 1 mA - ensures reliable triggering above operating voltage with margin. |
| VC @ IPP | 48.4 V clamping voltage at 13.0 A peak current - limits downstream voltage stress during 10/1000µs transients. |
| PPK | 600 W peak pulse power - withstands high-energy surges per ISO 7637-2 without failure. |
| ID @ VWM | <1 µA blocking leakage - negligible standby power loss in battery-powered systems. |
| RθJA | 55 °C/W junction-to-ambient thermal resistance - enables thermal design for continuous operation at TA ≤ 85°C. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; symmetrical bidirectional terminals require no polarity alignment during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals conduct equally during positive or negative transients - no directional installation required. |
| Cathode band (marking) | Polarity indicator | Visible band denotes terminal 1; irrelevant for SMBJ30CA function but aids visual verification in mixed-bidirectional layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC lines, differential buses, or ungrounded sensors without external diode pairing. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) - meets automotive OEM requirements. |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience overvoltage - critical for CAN, LIN, and microcontroller I/O protection. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow - compatible with standard SMT assembly without special handling. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life recycling mandates. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 24V supply rail in body control module against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary TVS clamp on main power input, placed upstream of DC-DC converters and MCU power supplies. Use Value: Limits transient voltage to ≤48.4V, preventing latch-up or permanent damage to 3.3V/5V logic powered from same rail. |
Use Scenario: Surge suppression on gate driver supply lines in 3-phase inverter PCBs. IC Role / Device Role / Timing Role: Bidirectional shunt device across isolated gate drive transformer secondary outputs. Use Value: Absorbs turn-off spikes from IGBTs/MOSFETs without polarity constraints, maintaining ±15V gate bias integrity. |
| LED Streetlight Driver | Smart Building Sensor Node |
Use Scenario: Input-stage protection in constant-current LED drivers exposed to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: First-line defense before bridge rectifier and PFC controller, rated for 600W peak energy. Use Value: Clamps 1kV/100Ω ring wave to <48.4V within 1ps, preserving electrolytic capacitor lifetime and MOSFET gate oxide integrity. |
Use Scenario: ESD protection on RS-485 bus lines connecting occupancy sensors and HVAC controllers. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pair (A/B), placed adjacent to connector with minimal trace length. Use Value: Maintains signal integrity up to 10 Mbps while passing IEC 61000-4-2 Level 4 (±15 kV contact) without data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ30CA | Same DO-214AC (SMA) package; 49.9V clamping at 12.7A; RθJA = 65°C/W. | Lower thermal efficiency requires larger copper area or lower ambient; identical ISO 7637-2 coverage. | Select when existing layout uses SMA footprint and thermal margin allows higher RθJA. |
| ON Semiconductor SMCJ30CA | DO-214AB (SMC) package; 49.3V clamping at 12.2A; 1.5× larger footprint; RθJA = 40°C/W. | Higher power handling and better thermal dissipation, but incompatible with SMB pad layout. | Choose for higher-reliability industrial designs where board space permits SMC and thermal derating is critical. |
Compared with SMBJ30CA, SMAJ30CA offers identical electrical specs but reduced thermal performance in a smaller package, while SMCJ30CA trades footprint compatibility for superior heat dissipation - selection depends on layout constraints and thermal budget, not functional equivalence.
Availability
SMBJ30CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive control, LED streetlight drivers, and smart building sensor nodes requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ30CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJ series was developed specifically for automotive-grade transient suppression, targeting ISO 7637-2 compliance and AEC-Q101 qualification readiness in compact surface-mount packages for engine control, lighting, and body electronics.
FAQ
What is the clamping voltage of SMBJ30CA at its rated peak pulse current?
The SMBJ30CA has a maximum clamping voltage (VC) of 48.4 V at 13.0 A peak impulse current (IPP) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains below safe overvoltage thresholds during standardized surge events. The SMBJ30CA maintains this clamping performance across its full operating temperature range.
Is SMBJ30CA unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ30CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., SMBJ30A), SMBJ30CA requires no orientation during placement - the cathode band marking is present but functionally irrelevant. This simplifies layout on AC-coupled or floating signal paths such as RS-485 or CAN bus lines.
Does SMBJ30CA meet automotive transient immunity standards?
Yes, SMBJ30CA meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (electrical fast transients) requirements as confirmed in Taiwan Semiconductor's official documentation. Its 600W peak power rating, 48.4V clamping, and sub-1ps response time are validated for use in automotive body control modules, lighting systems, and infotainment power supplies.
What is the maximum junction temperature and thermal resistance of SMBJ30CA?
The SMBJ30CA has a maximum junction temperature (TJ) of +150°C and a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions. These values enable reliable operation in under-hood automotive environments and industrial enclosures up to 85°C ambient, provided adequate PCB copper area is allocated for heat spreading per DO-214AA thermal guidelines.
How does SMBJ30CA compare to SMBJ30A in terms of electrical performance?
SMBJ30CA is bidirectional with symmetrical breakdown (33.3–36.8 V in both directions) and 48.4 V clamping, while SMBJ30A is unidirectional with identical VBR and VC only in the forward direction and open-circuit behavior in reverse. SMBJ30CA eliminates need for dual-diode configurations in AC applications, whereas SMBJ30A is suited for DC rail protection where polarity is fixed and lower cost is prioritized.
SMBJ30CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ30CA FAQ
1.How can I place an order for SMBJ30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CA 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 SMBJ30CA reliable?
The price and inventory of SMBJ30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CA is usually 5 days.
3.What payment methods are accepted for SMBJ30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CA?
SMBJ30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CA 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 SMBJ30CA?
For technical support, including SMBJ30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CA requirements.
6.How does Aetrix verify that SMBJ30CA is sourced from the original manufacturer or authorized distributors?
All SMBJ30CA 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 SMBJ30CA meets industry standards.
7.What is the process for return or replacement of SMBJ30CA?
All SMBJ30CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CA, 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 SMBJ30CA part is unused and in its original packaging.
Return procedure for SMBJ30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CA Tags
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