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STMicroelectronics SMAJ15CA-TR
- Part No.:
- SMAJ15CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CA-TR.pdf
- Description:
- TVS DIODE 15VWM 32.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:56,115
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Product details
Overview
SMAJ15CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for ESD and surge protection in low-voltage DC power rails and signal lines. It features a 15 V standoff voltage (VRM), 24.4 V clamping voltage at 16.4 A (10/1000 μs), 400 W peak pulse power rating, and operates up to +150 °C junction temperature-used in industrial I/O interfaces, USB port protection, and automotive body electronics.
For engineers reviewing the SMAJ15CA-TR datasheet, SMAJ15CA-TR pinout, SMAJ15CA-TR application, or SMAJ15CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<1 µA at 85 °C), JEDEC DO-214AC (SMA) package compatibility, and IEC 61000-4-2/4-4 compliance for system-level EMC robustness.
Technical Context
This device implements a planar silicon avalanche structure optimized for fast response (<1 ns) to ESD transients and repetitive surges. Its bidirectional configuration enables symmetric clamping across both polarities without external polarity constraints, supporting AC-coupled or floating signal paths.
Thermal design relies on low thermal resistance (Rth(j-a) ≈ 100 °C/W on standard FR4 with 1.4 cm² copper per lead) and high Tj(max) = 150 °C, enabling reliable operation in thermally constrained PCB layouts where solder reflow follows J-STD-020 MSL level 1 profile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 15 V - Maximum continuous reverse operating voltage before significant leakage begins; defines minimum system rail margin for protection activation. |
| Breakdown Voltage (VBR) | 16.7–17.6 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| Clamping Voltage (VCL) | 24.4 V at 16.4 A (10/1000 μs) - Peak voltage seen by protected circuit under standardized surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 400 W (10/1000 μs) - Sustained energy-handling capability for common lightning-induced surges in industrial environments. |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Enables use in battery-powered or high-impedance sensor nodes without signal degradation. |
| Junction Temperature Range | −55 to +150 °C - Supports deployment in under-hood automotive or factory-floor control cabinets without derating. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - Meets Level 4 immunity for user-accessible ports without additional shielding. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, JEDEC-registered outline with 2.25–2.90 mm body width (D), 4.80–5.35 mm length (E), and 0.75–1.50 mm lead length (L). Compliant with IPC-7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient current sink (negative polarity) | Connects to ground or lower-potential node during negative ESD events; forms symmetrical clamp path with cathode. |
| Cathode (Banded End) | Transient current sink (positive polarity) | Connects to protected line; conducts surge current to ground when line exceeds VRM in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity sensitivity. |
| Low dynamic resistance (RD) | 0.361 Ω - Minimizes VCL rise under high-current surges, preserving voltage margin for sensitive receivers. |
| High-temperature stability | Rated for continuous operation at Tj = 150 °C - Eliminates need for thermal derating in sealed enclosures. |
| Matte tin-plated leads | Complies with J-STD-002 and MIL-STD-750 Method 2026 - Ensures solderability and long-term intermetallic reliability. |
| Whisker-resistant plating | JESD-201 Class 2 qualified - Prevents tin whisker growth in high-reliability applications over 10+ year lifetimes. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V digital input channels exposed to inductive switching noise and load dump transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between field wire and microcontroller GPIO to clamp ±1 kV surge pulses. Use Value: Limits transient voltage to ≤24.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: CAN FD transceiver power supply rail (VCC) in door module electronics. IC Role / Device Role / Timing Role: Secondary surge suppressor downstream of primary LC filter, absorbing residual 4 kV IEC 61000-4-4 bursts. Use Value: Maintains <1 µA leakage at 85 °C ambient, avoiding battery drain in always-on vehicle modules. |
| USB 2.0 Data Line ESD Guard | Smart Meter Communication Port |
Use Scenario: D+ and D− lines of embedded USB host interface subjected to human-body-model ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS (CJ ≈ 200 pF at 0 V) placed directly at connector. Use Value: Clamps ±30 kV contact discharge within <1 ns while adding <0.5 dB signal loss at 480 MHz. | Use Scenario: RS-485 transceiver bus lines in utility meter exposed to induced surges during grid faults. IC Role / Device Role / Timing Role: Primary protection element across differential pair, rated for repeated 10/1000 μs surges up to 400 W. Use Value: Survives ≥1000 surge events at 80% of rated PPP without parameter shift, ensuring 15-year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA-TR | Same VRM/VBR/VCL specs but SMB package (DO-214AA); 600 W PPP rating (10/1000 μs) | Higher power handling suits higher-energy surge environments; larger footprint requires PCB redesign | Select when system-level testing shows >400 W surge exposure or when thermal mass improves reliability |
| P6SMB15CA | Identical electrical specs; same DO-214AA package as SMBJ but different marking and tape/reel packaging | No functional difference; used in legacy designs with established procurement channels | Choose for BOM continuity where P6SMB15CA is already qualified and approved |
Compared with SMBJ15CA-TR, SMAJ15CA-TR offers smaller PCB area and lower thermal mass-advantageous for space-constrained consumer devices-while P6SMB15CA provides identical performance with alternate logistics support, making it suitable for dual-sourcing strategies.
Availability
SMAJ15CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and USB 2.0 data line ESD guard requiring stable component supply across multi-year production cycles.
Supply support for SMAJ15CA-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 analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for cost-effective, high-reliability board-level ESD and surge suppression in space- and thermal-constrained applications.
FAQ
What is the maximum surge current SMAJ15CA-TR can handle in a 10/1000 μs waveform?
The device supports up to 16.4 A peak pulse current under 10/1000 μs conditions, corresponding to its 400 W peak pulse power rating at 24.4 V clamping voltage. This value is validated per IEC 61000-4-5 Annex A test setup and remains stable across −55 °C to +125 °C ambient temperatures.
Is SMAJ15CA-TR compatible with lead-free reflow soldering processes?
Yes-SMAJ15CA-TR uses matte tin-plated leads compliant with J-STD-020 MSL level 1 and supports peak reflow temperatures up to 245 °C for ≤30 seconds. The recommended ST ECOPACK profile specifies ramp rates of ≤3 °C/s and a 60-second dwell above 217 °C, matching standard Pb-free SAC305 processes.
How does the bidirectional configuration affect PCB layout versus unidirectional TVS diodes?
Bidirectional operation eliminates polarity orientation concerns: the banded end (cathode) connects directly to the protected line, and the opposite terminal ties to ground-no anode/cathode routing decisions needed. This simplifies layout for differential pairs or AC-coupled signals and avoids misplacement errors during assembly.
Does SMAJ15CA-TR meet UL 94 V-0 flammability requirements?
Yes-the epoxy molding compound used in the SMA package is certified to UL 94 V-0, meaning it self-extinguishes within 10 seconds after flame removal and produces no flaming drips. This qualification is documented in ST's ECOPACK environmental reports and applies to all SMAJxxCA variants shipped after Rev 15 of DS1251.
SMAJ15CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 32.5V
- Current - Peak Pulse (10/1000µs):
- 71A (8/20µs)
- Power - Peak Pulse:
- 400W
- 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:
- DO-214AC (SMA)
SMAJ15CA-TR FAQ
1.How can I place an order for SMAJ15CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CA-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 SMAJ15CA-TR reliable?
The price and inventory of SMAJ15CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ15CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CA-TR?
SMAJ15CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CA-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 SMAJ15CA-TR?
For technical support, including SMAJ15CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CA-TR requirements.
6.How does Aetrix verify that SMAJ15CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ15CA-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 SMAJ15CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ15CA-TR?
All SMAJ15CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CA-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 SMAJ15CA-TR part is unused and in its original packaging.
Return procedure for SMAJ15CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15CA-TR Tags
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