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STMicroelectronics SMBJ30CA-TR
- Part No.:
- SMBJ30CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CA-TR.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,985
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Product details
Overview
SMBJ30CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection on signal/power lines. It delivers 600 W peak pulse power (10/1000 µs), clamps transients to 48.4 V at 13 A, operates up to 150 °C junction temperature, and features low leakage (≤0.2 µA at 25 °C), making it suitable for industrial I/O, telecom interfaces, and automotive body electronics.
For engineers reviewing the SMBJ30CA-TR datasheet, SMBJ30CA-TR pinout, SMBJ30CA-TR application, or SMBJ30CA-TR equivalent, key selection criteria include bidirectional clamping voltage (VCL = 48.4 V @ 13 A), standoff voltage (VRM = 30 V), thermal derating above 25 °C, and UL497B recognition for isolated loop circuits.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (RD = 0.888 Ω at 25 °C). Its bidirectional structure enables symmetrical clamping for AC-coupled or floating lines without polarity constraints.
It meets IEC 61000-4-2 Level 4 (±30 kV contact/air discharge) and IEC 61000-4-4 Level 4 (4 kV), with clamping performance validated across junction temperatures from −55 °C to +150 °C using the αT = 9.9 × 10−4/°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - Maximum continuous reverse working voltage before clamping begins |
| Breakdown Voltage (VBR) | 33.3–35.1 V @ 1 mA - Guaranteed avalanche initiation range at 25 °C |
| Clamping Voltage (VCL) | 48.4 V @ 13 A (10/1000 µs) - Peak voltage seen by protected circuit during rated surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustained surge energy handling capability at Tj = 25 °C |
| Leakage Current (IR) | ≤0.2 µA @ 30 V, 25 °C - Minimal DC loading on high-impedance signal paths |
| Junction Temperature Range | −55 to +150 °C - Enables operation in under-hood automotive or industrial ambient environments |
| Dynamic Resistance (RD) | 0.888 Ω - Low impedance limits voltage overshoot during fast transients |
Pinout & Package
The SMBJ30CA-TR is housed in an SMB (DO-214AA) surface-mount package measuring 3.30–3.95 mm × 5.10–5.60 mm × 1.90–2.45 mm (L × W × H), with matte tin-plated leads compliant with J-STD-002 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Common terminal for bidirectional conduction | Not polarized - functions identically in either direction; band indicates cathode side of internal dual-diode structure |
| Anode | Common terminal for bidirectional conduction | Electrically symmetric with cathode; no functional distinction in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled, differential, or floating lines without polarity concerns |
| UL497B recognition (E136224) | Validated for use as isolated loop circuit protector in industrial safety systems |
| Low leakage current | ≤0.2 µA at 25 °C ensures minimal impact on precision sensor or analog front-end biasing |
| High-temperature operation | Rated to 150 °C junction temperature supports reliability in thermally constrained PCB layouts |
| IEC 61000-4-2/4-4 compliance | Guaranteed immunity to ±30 kV ESD and 4 kV electrical fast transients per standard test waveforms |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against induced surges from relay switching and field wiring faults. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp transients before reaching input buffer ICs. Use Value: Limits voltage to ≤48.4 V during 13 A surges, preventing latch-up or permanent damage to downstream logic-level receivers. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs in door modules exposed to load dump and ESD events. IC Role / Device Role / Timing Role: Primary line-level surge suppressor on bidirectional LIN data line and 12 V supply rail. Use Value: Withstands 30 kV contact discharge and maintains <0.2 µA leakage to avoid disrupting low-power sleep-state current budgets. |
| Telecom Ethernet Interface | Medical Diagnostic Equipment |
Use Scenario: Protecting RJ45 magnetics secondary-side signal pairs in PoE-powered network switches against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated Ethernet PHY interface, coordinated with primary-side protection. Use Value: Clamps 8/20 µs surges to 64.3 V at 62 A, preserving signal integrity while meeting IEC 61000-4-5 requirements. | Use Scenario: Shielding analog front-end inputs of patient monitoring devices from ESD during clinical handling and cable coupling. IC Role / Device Role / Timing Role: Final-stage TVS on low-noise amplifier inputs prior to ADC sampling path. Use Value: Sub-microamp leakage avoids DC offset errors; 48.4 V clamping prevents saturation of precision op-amps operating near rail-to-rail limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA from Vishay (SMCJ30CA) | Same SMB package, identical VRM/VCL, but higher RD = 1.05 Ω and lower PPP = 1500 W (8/20 µs) | Marginally lower clamping efficiency under fast 8/20 µs surges | Preferred where cost sensitivity outweighs sub-Ω dynamic resistance needs |
| P6SMB30CA from ON Semiconductor | VRM = 30 V, VCL = 48.4 V, but IR = 1 µA @ 85 °C vs. ST's 1 µA - same spec; slightly higher RD = 0.92 Ω | Identical thermal and electrical envelope; minor footprint variance in lead spacing | Drop-in compatible for legacy designs requiring second-source qualification |
Compared with SMBJ30CA-TR, the Vishay SMCJ30CA offers higher 8/20 µs surge rating but less precise clamping due to higher RD, while the ON Semiconductor P6SMB30CA matches ST's VCL and leakage but requires verification of solder mask clearance on high-density PCBs.
Availability
SMBJ30CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O, automotive body control modules, telecom Ethernet interfaces, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ30CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's transient protection product line, engineered specifically for high-reliability ESD and surge suppression in harsh electromagnetic environments with strict leakage and thermal stability requirements.
FAQ
What is the maximum clamping voltage of SMBJ30CA-TR under a 10/1000 µs surge?
The maximum clamping voltage is 48.4 V when subjected to a 13 A peak pulse (10/1000 µs waveform) at 25 °C. This value increases with junction temperature at a rate defined by αT = 9.9 × 10−4/°C, reaching approximately 52.1 V at 125 °C.
Is SMBJ30CA-TR suitable for protecting RS-485 communication lines?
Yes - its bidirectional structure, 48.4 V clamping voltage, and low 0.2 µA leakage make it ideal for RS-485 differential pair protection. It must be placed adjacent to the transceiver with short PCB traces to minimize inductance, and coordinated with common-mode chokes for full IEC 61000-4-4 compliance.
Does SMBJ30CA-TR meet automotive AEC-Q200 requirements?
No - SMBJ30CA-TR is not AEC-Q200 qualified. While it operates from −55 °C to +150 °C and passes JEDEC stress tests, ST does not list it in their AEC-Q200-certified portfolio. For automotive-critical applications, consider ST's Automotive-grade SMF33CA or SMAJ33CA variants.
How does the UL497B recognition benefit system-level safety certification?
UL497B recognition (file E136224) confirms the device is approved as an isolated loop circuit protector, enabling simplified system-level safety documentation for industrial control panels and hazardous-area barriers. It eliminates need for additional component-level testing when used per manufacturer's layout guidelines.
SMBJ30CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 13A
- 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:
- SMB
SMBJ30CA-TR FAQ
1.How can I place an order for SMBJ30CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CA-TR 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-TR reliable?
The price and inventory of SMBJ30CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ30CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CA-TR?
SMBJ30CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CA-TR 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-TR?
For technical support, including SMBJ30CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CA-TR requirements.
6.How does Aetrix verify that SMBJ30CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ30CA-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMBJ30CA-TR?
All SMBJ30CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CA-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMBJ30CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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