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STMicroelectronics SMA6J28CA-TR
- Part No.:
- SMA6J28CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28CA-TR.pdf
- Description:
- TVS DIODE 28VWM 51.6VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,789
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Product details
Overview
SMA6J28CA-TR from STMicroelectronics is a bidirectional 600 W transient voltage suppression diode designed for ESD and surge protection in low-capacitance signal lines. It features a 28 V stand-off voltage (VRM), 44.0 V clamping voltage at 13.8 A (10/1000 µs), and operates up to 175 °C junction temperature - deployed in USB, HDMI, and industrial I/O interfaces requiring robust IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV) compliance.
For engineers reviewing the SMA6J28CA-TR datasheet, SMA6J28CA-TR pinout, SMA6J28CA-TR application, or SMA6J28CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<1 µA @ 85 °C), JEDEC DO-214AC (SMA) package compatibility, and dynamic resistance of 0.697 Ω at 10/1000 µs - critical for protecting high-speed data lines without signal distortion.
Technical Context
The SMA6J28CA-TR uses planar silicon junction technology to achieve stable breakdown characteristics across -55 °C to +175 °C operating range, with temperature coefficient αT = 10⁻⁴/°C for both VBR and VCL. Its bidirectional symmetry enables identical clamping in both polarities, eliminating polarity-sensitive layout constraints.
Designed for IEC 61000-4-2 Level 4 ESD immunity and IEC 61000-4-4 Level 4 surge suppression, it delivers 600 W peak pulse power (10/1000 µs) and 4 kW (8/20 µs), with junction capacitance <100 pF at 0 V (f = 1 MHz), making it suitable for sub-100 Mbps digital interfaces where capacitive loading must remain minimal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 28 V - maximum continuous reverse working voltage before conduction begins; defines circuit operating margin before clamping activation. |
| Breakdown Voltage (VBR) | 31.1–34.4 V @ IBR = 1 mA - precise threshold at which avalanche conduction initiates; ensures predictable turn-on during transients. |
| Clamping Voltage (VCL) | 44.0 V @ IPP = 13.8 A (10/1000 µs) - maximum voltage seen by protected circuit during worst-case surge; determines downstream IC survivability. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - energy-handling capability under standard lightning-surge waveform; validates protection for industrial I/O ports. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - ultra-low off-state current minimizes power loss and signal interference in always-on sensor interfaces. |
| Dynamic Resistance (RD) | 0.697 Ω - slope of VCL vs. IPP curve; lower RD yields tighter clamping and reduced voltage overshoot during fast transients. |
| Junction Temperature Range | -55 °C to +175 °C - enables deployment in under-hood automotive, motor drives, and outdoor industrial enclosures without derating. |
Pinout & Package
Supplied in JEDEC DO-214AC (SMA) surface-mount package per IPC-7531 footprint, with matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 Method 2026. Package dimensions: D = 2.25–2.90 mm, E = 4.80–5.35 mm, L = 0.75–1.50 mm, weight = 72 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Transient current sink (bidirectional) | Acts as common reference node for both polarities; connects to ground or low-impedance return path to shunt surge energy. |
| Anode (A) | Transient current source (bidirectional) | Connects to protected line; forms symmetrical avalanche path with cathode to clamp overvoltage in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL in both directions - eliminates need for polarity-aware routing and supports AC-coupled signal paths like RS-485 or CAN FD. |
| Low junction capacitance | <100 pF @ 0 V (1 MHz) - preserves signal integrity on 10–100 Mbps serial buses without added rise-time degradation or reflection. |
| High-temperature reliability | Rated Tj max = 175 °C with no derating - sustains long-term operation in thermally constrained spaces such as PLC modules or motor control PCBs. |
| ESD robustness | ±30 kV contact/air discharge (IEC 61000-4-2 Level 4) - exceeds industrial and medical equipment immunity requirements without external shielding. |
| UL94 V0 resin housing | Flame-retardant encapsulation - satisfies safety certification for enclosed industrial and building automation systems. |
Applications
| Industrial I/O Protection | HDMI/DisplayPort ESD Guard |
|---|---|
Use Scenario: Protecting 24 V DC analog input channels in programmable logic controllers against field-induced surges and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed between signal line and chassis ground, clamping transients within 1 ns to prevent ADC damage or firmware lockup. Use Value: Withstanding 4 kV IEC 61000-4-4 bursts while maintaining <1 µA leakage ensures measurement accuracy and zero false triggers over 10+ year service life. | Use Scenario: Shielding HDMI 2.0 TMDS differential pairs from human-body ESD during hot-plug insertion in commercial AV equipment. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS mounted directly at connector, providing sub-nanosecond response to ±30 kV discharges without degrading 6 Gbps eye diagram. Use Value: 44.0 V clamping at 13.8 A prevents pixel corruption or HDCP handshake failure, while 0.697 Ω RD limits voltage overshoot to <1.5 V above VCL. |
| USB 2.0 Data Line Protection | Automotive Body Control Module |
Use Scenario: Safeguarding D+/D− lines of USB 2.0 host ports in embedded gateways against accidental ESD from user interaction. IC Role / Device Role / Timing Role: Dual-channel bidirectional TVS array (two SMA6J28CA-TR devices) placed adjacent to USB receptacle, referenced to system ground. Use Value: 100 pF capacitance avoids signal integrity loss at 480 Mbps; 0.2 µA leakage at 25 °C prevents bus enumeration failures due to pull-up leakage accumulation. | Use Scenario: Protecting LIN bus transceiver inputs in body control units exposed to load-dump and jump-start transients in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between LIN line and battery ground, absorbing 600 W pulses without thermal runaway. Use Value: 175 °C junction rating allows placement near power MOSFETs; 44.0 V clamping ensures transceiver remains within absolute maximum ratings during 120 V load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J28A-TR | Unidirectional configuration; forward voltage drop ~0.9 V @ 1 A; no negative-voltage clamping. | Only suitable for DC-biased lines (e.g., 5 V supply rail); cannot protect AC signals or floating references. | Select only when protecting single-polarity rails where reverse conduction is not required. |
| SMCJ28CA | Higher power rating (1500 W, DO-214AB package); larger footprint; 45.4 V clamping @ 33.5 A (10/1000 µs). | Used where higher surge energy (e.g., 48 V telecom power inputs) demands greater PPP; incompatible with SMA-restricted board space. | Choose when surge threat exceeds 600 W or when thermal mass requirements justify larger package. |
Compared with SMA6J28A-TR, SMA6J28CA-TR provides full bidirectional protection essential for AC-coupled interfaces, while SMCJ28CA trades compact size for higher energy handling - making SMA6J28CA-TR optimal for space-constrained, high-speed, polarity-agnostic protection.
Availability
SMA6J28CA-TR is available at Aetrix Electronics and suitable for industrial I/O protection, HDMI/DisplayPort ESD guard, and USB 2.0 data line protection requiring stable component supply, consistent tape-and-reel packaging (5000 pcs/reel), and full traceability to STMicroelectronics wafer lot.
Supply support for SMA6J28CA-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 automotive, industrial, and consumer markets.
The SMA6J series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, low-leakage, high-temperature TVS applications in industrial automation, medical instrumentation, and automotive body electronics.
FAQ
What is the difference between SMA6J28CA-TR and SMA6J28A-TR?
SMA6J28CA-TR is bidirectional, clamping transients of either polarity symmetrically, making it ideal for AC-coupled or floating signal lines like HDMI or RS-485. SMA6J28A-TR is unidirectional and only clamps positive transients relative to ground - it conducts forward current and cannot suppress negative excursions, limiting use to DC-biased rails.
Does SMA6J28CA-TR require a heatsink for 600 W surge handling?
No heatsink is required for single-event 600 W (10/1000 µs) surges because energy dissipation occurs in microseconds, and the device's thermal impedance (Zth(j-a)) is low enough to absorb the pulse without exceeding 175 °C junction temperature - provided the PCB uses the recommended IPC-7531 footprint with ≥1 cm² copper per pad per ST's thermal characterization data.
Can SMA6J28CA-TR be used in automotive applications?
Yes - its -55 °C to +175 °C operating range, AEC-Q200 alignment (via material and process qualification), and robustness against ISO 7637-2 load-dump and IEC 61000-4-5 surge make it suitable for non-safety-critical automotive domains including body control modules, infotainment interfaces, and LIN/CAN physical layer protection - subject to system-level validation.
How does the 0.697 Ω dynamic resistance affect circuit protection performance?
This value defines the incremental resistance during avalanche conduction: for every additional ampere of surge current beyond 13.8 A, clamping voltage rises by ~0.697 V. It directly impacts overshoot margin - e.g., a 15 A transient yields VCL ≈ 44.0 V + (1.2 A × 0.697 Ω) = 44.8 V - ensuring protected ICs see tightly bounded overvoltage even under varying surge amplitudes.
SMA6J28CA-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 51.6V
- Current - Peak Pulse (10/1000µs):
- 68A (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)
SMA6J28CA-TR FAQ
1.How can I place an order for SMA6J28CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28CA-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 SMA6J28CA-TR reliable?
The price and inventory of SMA6J28CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J28CA-TR is usually 5 days.
3.What payment methods are accepted for SMA6J28CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28CA-TR?
SMA6J28CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28CA-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 SMA6J28CA-TR?
For technical support, including SMA6J28CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28CA-TR requirements.
6.How does Aetrix verify that SMA6J28CA-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J28CA-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 SMA6J28CA-TR meets industry standards.
7.What is the process for return or replacement of SMA6J28CA-TR?
All SMA6J28CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28CA-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 SMA6J28CA-TR part is unused and in its original packaging.
Return procedure for SMA6J28CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J28CA-TR Tags
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