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STMicroelectronics SMCJ30CA-TR
- Part No.:
- SMCJ30CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CA-TR.pdf
- Description:
- TVS DIODE 30VWM 64.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,258
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Product details
Overview
SMCJ30CA-TR from STMicroelectronics is a bidirectional 30 V standoff transient voltage suppression (TVS) diode in SMC package, rated for 1500 W peak pulse power (10/1000 µs), 64.3 A maximum peak pulse current, and 48.4 V clamping voltage at 32 A - designed to protect DC power rails and I/O lines in industrial motor drives, telecom interfaces, and automotive body electronics against IEC 61000-4-2 ESD (±30 kV air/contact) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMCJ30CA-TR datasheet, SMCJ30CA-TR pinout, SMCJ30CA-TR application, or SMCJ30CA-TR equivalent, this component delivers verified bidirectional surge protection with low leakage (≤0.2 µA at 25 °C), high junction temperature operation (up to +150 °C), and JEDEC-registered SMC footprint compatibility - critical for robust front-end protection in space-constrained, thermally demanding designs.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds its 33.3 V minimum breakdown (VBR) at 1 mA, it avalanches into low-impedance conduction to divert surge energy away from downstream circuitry. Its bidirectional configuration enables symmetrical clamping for AC-coupled or floating signal paths without polarity dependency.
Thermal performance is defined by junction-to-ambient thermal resistance (Rth(j-a) ≈ 100 °C/W on standard FR4), dynamic resistance (RD = 0.361 Ω at 25 °C), and derated pulse power - maintaining 1250 W capability at Tj = +150 °C per Figure 3. It complies with IEC 61000-4-2 Level 4 (±30 kV) and IEC 61000-4-4 Level 4 (4 kV), exceeding MIL-STD-883 Method 3015 for ESD robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 30 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for protected line voltage. |
| Breakdown Voltage (VBR) | 33.3–35.1 V at 1 mA - precise avalanche onset threshold ensuring predictable clamping initiation. |
| Clamping Voltage (VCL) | 48.4 V at 32 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; defines safe margin over IC absolute max ratings. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - surge energy handling capacity under standard lightning waveform; supports industrial-grade immunity. |
| Leakage Current (IR) | ≤0.2 µA at 30 V and 25 °C - negligible standby power loss and minimal impact on high-impedance sensor or reference circuits. |
| Junction Temperature Range | −55 to +150 °C - enables deployment in under-hood automotive, industrial PLCs, and outdoor telecom enclosures without derating. |
| ESD Rating | ±30 kV (air & contact discharge, IEC 61000-4-2) - exceeds Level 4 requirement; eliminates need for additional ESD staging in many interface designs. |
Pinout & Package
SMCJ30CA-TR uses the industry-standard SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length, 5.55–6.25 mm width, 2.45 mm max height, with gull-wing leads spaced 7.75 mm apart (E) and 6.60–7.15 mm between outer terminals (E1). Matte tin-plated leads comply with J-STD-002 and IPC7531 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Mark Side) | Transient return path (bidirectional) | Shared terminal for both polarities; connects to GND or common reference plane for symmetrical clamping. |
| Cathode (Marked Band) | Transient return path (bidirectional) | Identical function to Anode in CA variant; marking indicates cathode side but device conducts equally in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating supplies without polarity concerns. |
| Low dynamic resistance (0.361 Ω) | Minimizes clamping voltage rise under high-current surges, preserving tighter voltage margins for sensitive 3.3 V/5 V logic. |
| High-temperature operation (+150 °C) | Supports placement near heat sources (e.g., power MOSFETs, inductors) without derating, reducing board area and thermal management complexity. |
| UL94 V0 epoxy housing | Meets flammability safety requirements for industrial and automotive end equipment certifications. |
| JEDEC-compliant SMC outline | Ensures drop-in compatibility with existing SMC footprints and automated assembly processes across contract manufacturers. |
Applications
| Industrial Motor Drives | Telecom Interface Protection |
|---|---|
|
Use Scenario: Protecting gate driver supply rails and encoder feedback lines in servo inverters exposed to switching transients and EFT bursts. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry and IC power pins to clamp induced surges before they reach isolated gate drivers or position sensors. Use Value: Prevents latch-up or permanent damage in 3.3 V microcontrollers and isolated amplifiers by limiting transient voltage to ≤48.4 V during 1 kV/µs edge events. |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs in base station remote radio units subjected to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS connected across differential pairs (A/B) and to chassis ground to suppress common-mode and differential-mode transients simultaneously. Use Value: Maintains signal integrity under IEC 61000-4-4 Level 4 (4 kV) by clamping within 10 ns, avoiding data corruption or transceiver reset during field operation. |
| Automotive Body Control Modules | Medical Diagnostic Equipment |
|
Use Scenario: Securing LIN bus nodes and LED driver inputs in door modules where load dump and ISO 7637-2 pulses coexist with ESD events. IC Role / Device Role / Timing Role: Primary front-end protector on 12 V supply input and LIN signal lines, placed upstream of LDOs and transceivers. Use Value: Withstands 1250 W surge at +150 °C junction temperature, eliminating thermal runaway risk during repeated load dump events in engine bay proximity. |
Use Scenario: Shielding analog front-end ADC inputs and touch panel controllers in portable ultrasound devices from user ESD and EMI coupling. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 µA) TVS mounted adjacent to precision op-amps and SAR ADCs to avoid offset drift or gain error. Use Value: Enables Class B medical EMC compliance (IEC 60601-1-2) without degrading 16-bit measurement accuracy due to sub-nA leakage contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA-TR | Same VRWM/VBR, but lower PPP (600 W) and higher RD (0.52 Ω); SMB package (smaller footprint, lower thermal mass). | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 Level 4 in high-impedance lines. | Select when board space is critical and surge threat level is ≤600 W (e.g., consumer USB ports). |
| 1.5KE30CA | Same VRWM/VBR, but axial DO-201 package; 1500 W rating but slower response (>1 ns) and higher parasitic inductance. | Not suitable for high-frequency transients or dense SMT layouts; requires through-hole assembly. | Choose only for legacy through-hole designs or cost-sensitive non-automotive applications where reflow compatibility is not required. |
Compared with SMBJ30CA-TR and 1.5KE30CA, SMCJ30CA-TR uniquely balances 1500 W surge capacity, SMT manufacturability, and sub-nanosecond response - making it optimal for new industrial and automotive PCBs requiring IEC 61000-4-2/4-4 compliance without footprint or thermal compromise.
Availability
SMCJ30CA-TR is available at Aetrix Electronics and suitable for industrial motor drives, telecom interface protection, and automotive body control modules requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ30CA-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 silicon solutions for smart driving, power management, and industrial automation.
SMCJ series TVS diodes belong to ST's Transient Voltage Suppression portfolio, engineered specifically for high-reliability surge protection in harsh environments - emphasizing low leakage, high-temperature stability, and standardized SMT packaging for automotive and industrial end equipment.
FAQ
What is the difference between SMCJ30A-TR and SMCJ30CA-TR?
SMCJ30A-TR is unidirectional (anode-cathode polarity), suitable for DC rail protection where surge direction is known; SMCJ30CA-TR is bidirectional, providing symmetrical clamping for AC signals, differential buses, or floating references. Their VRWM, VBR, and VCL values are identical, but CA variants have mirrored I-V curves.
Can SMCJ30CA-TR be used in parallel for higher surge current handling?
No - TVS diodes exhibit negative temperature coefficient and mismatched VBR tolerances (±5%), causing current imbalance and potential thermal runaway. For >64.3 A peak current, select a higher-rated part like SMCJ33CA-TR or implement staged protection with upstream current-limiting resistors.
Does SMCJ30CA-TR meet AEC-Q200 stress testing requirements?
No - while rated for −55 to +150 °C operation and compliant with IEC/UL/MIL standards, SMCJ30CA-TR is not AEC-Q200 qualified. For automotive-grade qualification, ST offers the Automotive Qualified (AQ) variant: SMCJ30CA-AQ, which undergoes extended temperature cycling, humidity bias, and mechanical shock testing.
How does junction temperature affect clamping voltage in SMCJ30CA-TR?
VCL increases with junction temperature at αT = 9.9 × 10−4/°C; at +150 °C, VCL rises ~12% above its 25 °C value (48.4 V → ~54.2 V). Designers must verify protected ICs maintain safe margin above this elevated clamping voltage under worst-case thermal conditions.
SMCJ30CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, 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:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 156A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- SMC
SMCJ30CA-TR FAQ
1.How can I place an order for SMCJ30CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CA-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 SMCJ30CA-TR reliable?
The price and inventory of SMCJ30CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CA-TR is usually 5 days.
3.What payment methods are accepted for SMCJ30CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CA-TR?
SMCJ30CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CA-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 SMCJ30CA-TR?
For technical support, including SMCJ30CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CA-TR requirements.
6.How does Aetrix verify that SMCJ30CA-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ30CA-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 SMCJ30CA-TR meets industry standards.
7.What is the process for return or replacement of SMCJ30CA-TR?
All SMCJ30CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CA-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 SMCJ30CA-TR part is unused and in its original packaging.
Return procedure for SMCJ30CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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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
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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