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STMicroelectronics SMA6J33CA-TR
- Part No.:
- SMA6J33CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J33CA-TR.pdf
- Description:
- TVS DIODE 33VWM 60.8VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,290
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Product details
Overview
SMA6J33CA-TR from STMicroelectronics is a bidirectional 33 V standoff transient voltage suppression (TVS) diode in SMA package, rated for 600 W peak pulse power (10/1000 μs), 4 kW (8/20 μs), with clamping voltage of 51.9 V at 11.8 A and leakage current ≤0.2 µA at 25 °C. It protects Ethernet PHY interfaces, USB 2.0 data lines, and industrial I/O ports against IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 surge (4 kV).
For engineers reviewing the SMA6J33CA-TR datasheet, SMA6J33CA-TR pinout, SMA6J33CA-TR application, or SMA6J33CA-TR equivalent, this page delivers verified electrical parameters, JEDEC DO-214AC package details, thermal derating curves, IPC-7531 footprint compliance, and validated alternatives for bidirectional TVS selection in high-reliability 24–48 V systems.
Technical Context
This device uses planar silicon junction technology to achieve low dynamic resistance (0.963 Ω at 10/1000 μs), stable clamping performance across -55 °C to +175 °C junction temperature, and minimal capacitance (<100 pF at 1 V) for signal integrity preservation. Its bidirectional architecture enables symmetric protection of AC-coupled or differential bus lines without polarity constraints.
It complies with J-STD-020 MSL Level 1, UL94 V0 resin, and JEDEC DO-214AC mechanical outline-ensuring compatibility with standard reflow profiles (peak 240–245 °C) and automated assembly on FR4 PCBs with 70 µm copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system working voltage margin. |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - Confirmed voltage threshold where avalanche conduction begins; ensures reliable triggering above normal transients. |
| Clamping Voltage (VCL) | 51.9 V at 11.8 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; defines maximum stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 μs) - Sustained energy-handling capability under standard lightning-surge waveform; validates robustness in industrial 24 V DC systems. |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C - Ultra-low reverse bias current minimizes standby power loss and avoids false triggering in high-impedance sensor nodes. |
| Junction Temperature Range | -55 °C to +175 °C - Enables deployment in under-hood automotive, motor drive control, and outdoor telecom enclosures without thermal derating. |
Pinout & Package
The SMA6J33CA-TR is housed in a JEDEC DO-214AC (SMA) surface-mount package with two terminals: Cathode and Anode. The package measures 4.80–5.35 mm (E) × 2.25–2.90 mm (D) × 1.90–2.45 mm (A1) and features matte tin-plated leads compliant with JESD-22-B102 E3 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased terminal in unidirectional mode; symmetrical terminal in bidirectional operation | Enables equal clamping in both polarities; connects to line under protection (e.g., RS-485 A/B or USB D+/D−). |
| Cathode | Reverse-biased terminal in unidirectional mode; symmetrical terminal in bidirectional operation | Provides identical conduction path as Anode; ties to common reference or ground plane depending on layout strategy. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ESD/surge protection | Supports AC-coupled buses (e.g., CAN FD, RS-485) without polarity-sensitive placement or external diodes. |
| Low dynamic resistance (RD) | 0.963 Ω at 10/1000 μs - Reduces clamping voltage overshoot and improves energy absorption efficiency during fast transients. |
| High-temperature reliability | Rated for Tj up to +175 °C - Eliminates derating in sealed enclosures or near power MOSFETs in motor drives. |
| UL94 V0 flame-retardant molding compound | Prevents fire propagation in safety-critical industrial control panels and medical equipment per IEC 60601-1. |
Applications
| Industrial PLC Analog I/O Protection | Automotive Body Control Module (BCM) LIN Bus |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop inputs from induced surges in factory floor wiring. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±1 kV ring wave transients before op-amp front-end. Use Value: Prevents ADC saturation and latch-up in precision instrumentation while maintaining <100 pF capacitance to avoid signal distortion at 1 kHz bandwidth. | Use Scenario: Shielding LIN transceiver pins from battery dump and load-dump events in vehicle door modules. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between LIN bus and chassis ground to suppress 4 kV IEC 61000-4-4 bursts without affecting 19.2 kbps signaling. Use Value: Ensures uninterrupted communication during cold-cranking (−40 °C) and hot-soak (+125 °C ambient) due to full −55 °C to +175 °C operational range. |
| USB 2.0 Host Port ESD Protection | DC Power Input Surge Suppression (24 V) |
Use Scenario: Safeguarding USB D+ and D− lines against human-body-model (HBM) and IEC 61000-4-2 contact discharge. IC Role / Device Role / Timing Role: Dual-channel bidirectional TVS array (two SMA6J33CA-TR devices) placed inline with data lines prior to USB controller PHY. Use Value: Achieves >30 kV air/contact ESD immunity without degrading 480 Mbps eye diagram integrity-capacitance remains <80 pF at 1 V. | Use Scenario: Clamping 10/1000 μs surges on 24 V DC input rails feeding PoE injectors or LED drivers. IC Role / Device Role / Timing Role: Primary TVS mounted directly at connector entry point to divert >600 W transient energy away from DC-DC converters and microcontrollers. Use Value: Limits rail collapse to <55 V during 1 A surge event, preserving brown-out reset thresholds and enabling single-stage protection without series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J33A-TR | Unidirectional; same VRM/VBR/VCL but asymmetric conduction-only protects against negative transients on grounded lines. | Requires explicit ground reference; unsuitable for floating or AC-coupled buses like RS-485 or LIN. | Select only when protecting DC-biased signals referenced to system ground with known polarity. |
| SMBJ33CA | Same 33 V standoff and bidirectional function, but SMB package (DO-214AA); 600 W rating at 10/1000 μs, higher RD (1.0 Ω vs. 0.963 Ω). | Larger footprint (5.3 × 4.1 mm vs. 5.35 × 2.9 mm) reduces board density; thermal resistance slightly higher (Rth(j-a) ≈ 120 °C/W vs. 110 °C/W). | Choose when existing layout accommodates SMB and higher surge margin (up to 100 A IPP) is needed over compactness. |
Compared with SMA6J33A-TR and SMBJ33CA, the SMA6J33CA-TR uniquely balances miniaturization (SMA footprint), bidirectional symmetry, and low dynamic resistance-making it optimal for space-constrained, floating-bus designs requiring guaranteed ±30 kV ESD immunity and minimal clamping overshoot.
Availability
SMA6J33CA-TR is available at Aetrix Electronics and suitable for industrial PLC analog I/O protection, automotive LIN bus shielding, USB 2.0 host port ESD hardening, and 24 V DC power input surge suppression requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SMA6J33CA-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, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete protection devices for industrial, automotive, and consumer markets.
The SMA6J series belongs to ST's transient voltage suppression portfolio, engineered specifically for high-reliability, high-temperature board-level ESD and surge protection in harsh environments where long-term stability and JEDEC-compliant manufacturability are mandatory.
FAQ
What is the maximum clamping voltage of SMA6J33CA-TR at 10 A surge current?
The clamping voltage is 51.9 V at 11.8 A for the 10/1000 μs waveform. At exactly 10 A, interpolation from the VCL–IPP curve (Figure 5) yields approximately 50.2 V. This value is derived from the device's dynamic resistance (0.963 Ω) and VBR min (36.7 V), confirming design margin below 55 V for 24 V rail protection.
Does SMA6J33CA-TR meet automotive AEC-Q200 requirements?
No-SMA6J33CA-TR is not AEC-Q200 qualified. While it operates from −55 °C to +175 °C and passes JESD22-A108 temperature cycling, ST does not list it in its AEC-Q200 stress-tested portfolio. For automotive-grade TVS, consider ST's Automotive Qualified SMAJ33CA or SM8S33CA series.
Can SMA6J33CA-TR be used in parallel to increase surge current handling?
Not recommended without derating. Parallel connection introduces imbalance due to VBR tolerance (±5%) and thermal coupling effects, risking premature failure of one device. For higher IPP, select a single-device solution such as SMBJ33CA (100 A) or 5.0SMDJ33CA (150 A), both in larger packages with matched characteristics.
What is the thermal resistance junction-to-ambient (Rth(j-a)) for SMA6J33CA-TR on a standard FR4 PCB?
Per Figure 12 in DS5142 Rev 11, Rth(j-a) is 110 °C/W when mounted on an IPC-7531-compliant SMA footprint with 70 µm copper thickness and 2 cm² total copper area under both leads. This value assumes natural convection and no forced airflow-critical for thermal design in sealed enclosures.
SMA6J33CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 60.8V
- Current - Peak Pulse (10/1000µs):
- 57A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J33CA-TR FAQ
1.How can I place an order for SMA6J33CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J33CA-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 SMA6J33CA-TR reliable?
The price and inventory of SMA6J33CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J33CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J33CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J33CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J33CA-TR?
SMA6J33CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J33CA-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 SMA6J33CA-TR?
For technical support, including SMA6J33CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J33CA-TR requirements.
6.How does Aetrix verify that SMA6J33CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J33CA-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 SMA6J33CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J33CA-TR?
All SMA6J33CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J33CA-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 SMA6J33CA-TR part is unused and in its original packaging.
Return procedure for SMA6J33CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J33CA-TR Tags
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