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STMicroelectronics SMA6J20CA-TR
- Part No.:
- SMA6J20CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J20CA-TR.pdf
- Description:
- TVS DIODE 20VWM 36.8VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:18,142
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Product details
Overview
SMA6J20CA-TR from STMicroelectronics is a bidirectional 600 W transient voltage suppression diode with a standoff voltage of 20 V, clamping voltage of 31.4 V at 19.4 A (10/1000 µs), and operating junction temperature up to +175 °C. It protects sensitive electronics against IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV), deployed in DC power rails and interface lines of industrial controllers and automotive ECUs.
For engineers reviewing the SMA6J20CA-TR datasheet, SMA6J20CA-TR pinout, SMA6J20CA-TR application, or SMA6J20CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and thermal stability across -55 °C to +175 °C junction range.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (0.354 Ω) and stable breakdown voltage drift coefficient (αT = 10−4/°C). Its bidirectional structure enables symmetrical clamping on AC-coupled or floating signal lines without polarity constraints.
The device meets IEC 61000-4-2 Level 4 (30 kV contact/air discharge) and IEC 61000-4-4 Level 4 (4 kV), with peak pulse power rated at 600 W (10/1000 µs) and 4 kW (8/20 µs), validated under Tj initial = 25 °C per DS5142 Rev 11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 20 V - Maximum continuous reverse working voltage before conduction begins |
| Breakdown Voltage (VBR) | 22.2–24.5 V @ 1 mA - Confirmed voltage range where device enters avalanche region |
| Clamping Voltage (VCL) | 31.4 V @ 19.4 A (10/1000 µs) - Peak voltage seen by protected circuit during 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 @ 25 °C, 1 µA @ 85 °C - Minimal parasitic loading on high-impedance signal paths |
| Junction Temperature Range | −55 °C to +175 °C - Enables deployment in under-hood automotive and industrial environments |
| ESD Withstand (IEC 61000-4-2) | 30 kV air & contact discharge - Exceeds Level 4 for robust system-level ESD immunity |
Pinout & Package
Supplied in JEDEC DO-214AC (SMA) surface-mount package with standardized IPC-7531 footprint, matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026, and UL94 V0-rated resin encapsulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge current sink (bidirectional) | Common terminal for both avalanche directions; connects to ground or reference plane |
| Anode (A) | Surge current source (bidirectional) | Common terminal opposite cathode; symmetric conduction path for ± transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled or floating differential lines without polarity biasing |
| Low dynamic resistance (RD) | 0.354 Ω ensures minimal voltage overshoot during fast 8/20 µs surges |
| High-temperature operation | +175 °C Tjmax supports placement near heat sources in automotive power modules |
| JEDEC DO-214AC compliance | Guarantees mechanical and soldering compatibility with standard SMA footprint designs |
| UL94 V0 resin | Meets flammability safety requirements for enclosed industrial and transportation equipment |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC digital input channels in programmable logic controllers against induced lightning surges and relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional TVS placed between field input and optocoupler input, clamping transients within 10 ns. Use Value: Maintains signal integrity under 4 kV IEC 61000-4-4 surge while adding <0.5 pF capacitance to 1 MHz analog sensing lines. | Use Scenario: Safeguarding LIN bus transceiver pins and sensor supply rails in body control units exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail and bidirectional clamping on LIN data line (±12 V tolerance). Use Value: Survives 175 °C junction temperature during under-hood thermal cycling and suppresses 30 kV ESD events without latch-up. |
| USB 2.0 Data Line Protection | DC-DC Converter Input Stage |
Use Scenario: ESD protection for D+ and D− lines in USB host ports subjected to frequent human-contact discharge in consumer and medical devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at USB connector, shunting ESD before reaching PHY IC. Use Value: Adds only 120 pF capacitance at 1 V bias, preserving signal rise time for full-speed (12 Mbps) USB operation. | Use Scenario: Surge suppression on 24 V input of isolated DC-DC converters used in railway signaling and factory automation power supplies. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter and controller IC, absorbing repetitive 600 W transients. Use Value: Delivers 600 W (10/1000 µs) pulse handling with <1 µA leakage at 20 V, minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-TR | Same VRWM (20 V), higher PPP = 600 W but in larger SMB (DO-214AA) package; RD = 0.32 Ω | Requires PCB area increase (~30% larger footprint); better thermal dissipation for sustained surge duty | Select when board space permits and thermal margin is critical over compactness |
| SMCJ20CA-TR | Same VRWM, PPP = 1500 W in SMC (DO-214AB) package; RD = 0.15 Ω | Designed for 1.5 kW surges; overqualified for 600 W use cases; higher cost and size | Choose only if system-level testing requires >1 kW surge margin or legacy SMC footprint reuse |
Compared with SMBJ20CA-TR and SMCJ20CA-TR, SMA6J20CA-TR offers optimal balance of surge rating, compact DO-214AC footprint, and low leakage-making it preferred for space-constrained industrial and automotive PCBs where 600 W protection suffices.
Availability
SMA6J20CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, USB 2.0 data line hardening, and DC-DC converter input stage surge suppression requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SMA6J20CA-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 devices, sensors, and protection components for industrial, automotive, and consumer markets.
The SMA6J series belongs to ST's transient voltage suppression portfolio, engineered specifically for high-reliability, high-temperature ESD and surge protection in space-constrained surface-mount applications.
FAQ
What is the maximum clamping voltage of SMA6J20CA-TR under a 10/1000 µs surge?
The maximum clamping voltage is 31.4 V at 19.4 A for a 10/1000 µs waveform, measured at Tj = 25 °C per DS5142 Rev 11. This value increases linearly with junction temperature using αT = 10−4/°C, reaching ~33.1 V at Tj = 125 °C.
Is SMA6J20CA-TR unidirectional or bidirectional, and how does that affect PCB layout?
SMA6J20CA-TR is bidirectional, with symmetrical avalanche characteristics across both terminals. This eliminates polarity concerns during placement-no anode/cathode orientation is required-and allows direct integration into AC-coupled or floating signal paths like LIN, CAN, or USB differential pairs without external biasing.
Does SMA6J20CA-TR meet automotive AEC-Q200 stress test requirements?
No-SMA6J20CA-TR is not AEC-Q200 qualified. While it operates up to +175 °C junction temperature and passes JEDEC MSL level 1, ST does not list it in its AEC-Q200 stress-tested portfolio. For automotive-grade qualification, consider ST's Automotive TVS series such as the TRANSIL™ AEC-Q200-compliant SMAJ20CA-Q.
Can SMA6J20CA-TR be used in parallel to increase surge current handling?
Parallel use is not recommended due to mismatch in dynamic resistance (RD = 0.354 Ω) and VBR tolerance (±5%), which causes uneven current sharing and potential thermal runaway. For higher surge ratings, select a single-device solution like SMCJ20CA-TR (1500 W) instead of paralleling SMA6J20CA-TR units.
SMA6J20CA-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 36.8V
- Current - Peak Pulse (10/1000µs):
- 93A (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)
SMA6J20CA-TR FAQ
1.How can I place an order for SMA6J20CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J20CA-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 SMA6J20CA-TR reliable?
The price and inventory of SMA6J20CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J20CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J20CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J20CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J20CA-TR?
SMA6J20CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J20CA-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 SMA6J20CA-TR?
For technical support, including SMA6J20CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J20CA-TR requirements.
6.How does Aetrix verify that SMA6J20CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J20CA-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 SMA6J20CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J20CA-TR?
All SMA6J20CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J20CA-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 SMA6J20CA-TR part is unused and in its original packaging.
Return procedure for SMA6J20CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J20CA-TR Tags
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