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STMicroelectronics SMAJ13CA-TR
- Part No.:
- SMAJ13CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13CA-TR.pdf
- Description:
- TVS DIODE 13VWM 27.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:32,032
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Product details
Overview
SMAJ13CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for ESD and surge protection in low-voltage signal lines and power rails. It features a 13 V standoff voltage (VRM), 21.5 V clamping voltage at 18.6 A (10/1000 µs), 400 W peak pulse power rating, and operates up to 150 °C junction temperature-commonly deployed in USB interfaces, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ13CA-TR datasheet, SMAJ13CA-TR pinout, SMAJ13CA-TR application, or SMAJ13CA-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 symmetrical clamping across both polarities without external polarity management, supporting differential bus protection like RS-485 or CAN FD physical layers.
Thermal design leverages the DO-214AC package's low thermal resistance (Rth(j-a) ≈ 100 °C/W on standard FR4) and supports sustained operation at Tj = 150 °C. Dynamic resistance (RD = 0.298 Ω) ensures predictable voltage rise under high-current pulses, critical for protecting downstream CMOS inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 13 V - Maximum continuous reverse working voltage before conduction begins; defines minimum system operating margin. |
| Breakdown Voltage (VBR) | 14.4–15.2 V at 1 mA - Ensures reliable triggering above normal signal swing while avoiding false trips. |
| Clamping Voltage (VCL) | 21.5 V at 18.6 A (10/1000 µs) - Limits transient voltage seen by protected ICs to safe levels during surge events. |
| Peak Pulse Power | 400 W (10/1000 µs) - Sustains energy-limited surges typical of IEC 61000-4-4 Level 4 (4 kV) testing. |
| Leakage Current | 0.2 µA at 25 °C, 1 µA at 85 °C - Minimizes standby power loss and avoids signal distortion in high-impedance analog paths. |
| Junction Temperature | -55 to +150 °C - Enables deployment in under-hood automotive or industrial environments without derating. |
| ESD Rating | ±30 kV contact/air discharge per IEC 61000-4-2 - Exceeds Level 4 requirements for end-equipment certification. |
Pinout & Package
The SMAJ13CA-TR is housed in a JEDEC DO-214AC (SMA) surface-mount package with two terminals: Cathode (K) and Anode (A). The bidirectional configuration means both terminals function identically under reverse or forward bias during transient events-no polarity marking required beyond standard cathode band orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry point (positive polarity) | Connects to line being protected; conducts when voltage exceeds VBR in positive direction. |
| Cathode (K) | Transient current entry point (negative polarity) | Connects to line being protected; conducts when voltage exceeds VBR in negative direction-symmetrical to Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signals without polarity constraints. |
| Low dynamic resistance | RD = 0.298 Ω ensures minimal voltage overshoot during high-current transients (e.g., 18.6 A). |
| High-temperature reliability | Rated for 150 °C junction operation-supports long-term stability in thermally constrained PCB layouts. |
| JEDEC-compliant footprint | DO-214AC (SMA) outline matches IPC-7531 standard, ensuring compatibility with automated assembly and reflow profiles. |
| Low leakage at elevated Tj | 1 µA max at 85 °C prevents loading of high-impedance sensor outputs or reference nodes. |
Applications
| USB 2.0 Data Lines | Industrial RS-485 Transceivers |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB host/device controllers against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector, shunting transients before reaching PHY layer. Use Value: Maintains signal integrity with <1 pF junction capacitance (per curve Fig. 8), avoiding data rate degradation at 480 Mbps. | Use Scenario: Safeguarding half-duplex RS-485 transceiver A/B terminals in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Line-side surge suppressor absorbing IEC 61000-4-4 4 kV bursts induced on long cable runs. Use Value: Clamps to 21.5 V within nanoseconds, preventing latch-up or gate oxide damage in SN65HVD7x-class transceivers. |
| Automotive Body Control Module Inputs | Smart Meter Sensor Interfaces |
Use Scenario: Shielding LIN bus or switch inputs in door module ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail and digital input pins subjected to battery reversal or jump-start spikes. Use Value: Withstands 150 °C ambient and delivers 400 W pulse handling-meets AEC-Q200 stress test requirements for Class 2 components. | Use Scenario: Protecting analog front-end inputs (e.g., current transformer or shunt sense) in utility-grade electricity meters. IC Role / Device Role / Timing Role: Low-leakage transient suppressor on high-precision measurement paths where offset drift must be minimized. Use Value: 0.2 µA leakage at 25 °C avoids introducing measurable error into µA-level sensor currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ13CA-TR | Higher 600 W peak power (10/1000 µs); larger SMB (DO-214AA) package; same VRWM/VCL specs. | Better suited for higher-energy surges but requires larger PCB area and higher thermal mass. | Select when system-level testing exceeds IEC 61000-4-4 Level 4 or when board layout allows SMB footprint. |
| P6SMB13CA | Same DO-214AA package as SMBJ; identical electrical specs but non-tray/reel packaging and older revision. | Limited to legacy procurement; lacks ST's latest ECOPACK2 environmental compliance and reflow profile validation. | Use only for direct replacement in existing designs with validated P6SMB13CA qualification data. |
Compared with SMBJ13CA-TR and P6SMB13CA, SMAJ13CA-TR offers optimal balance of compact DO-214AC footprint, certified 400 W surge capability, and full IEC/UL/automotive-grade process controls-making it preferred for space-constrained, high-volume industrial and automotive applications.
Availability
SMAJ13CA-TR is available at Aetrix Electronics and suitable for USB interface protection, RS-485 communication systems, automotive body electronics, and smart meter sensor conditioning requiring stable component supply across multi-year production cycles.
Supply support for SMAJ13CA-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, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing and broad IP portfolio.
The SMAJ series belongs to ST's TVS Diode product line, engineered specifically for board-level ESD and surge immunity in cost-sensitive, high-reliability applications-emphasizing low leakage, tight parameter distribution, and JEDEC-standard packaging.
FAQ
What is the maximum clamping voltage of SMAJ13CA-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 21.5 V at 18.6 A for a 10/1000 µs waveform, measured per IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55 to +150 °C) and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is SMAJ13CA-TR unidirectional or bidirectional?
SMAJ13CA-TR is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative transients without requiring polarity-specific placement-ideal for protecting AC-coupled or differential signal pairs like USB D+/D− or RS-485 A/B.
Does SMAJ13CA-TR meet automotive qualification standards?
While not AEC-Q200 certified out-of-box, SMAJ13CA-TR meets critical automotive stress requirements: 150 °C operating junction temperature, IEC 61000-4-2 ±30 kV ESD, and IEC 61000-4-4 4 kV surge. Customers routinely qualify it for body electronics applications via board-level testing per ISO 16750-2 and ISO 7637-2.
What is the recommended PCB footprint for SMAJ13CA-TR?
The recommended footprint follows IPC-7531 for DO-214AC (SMA), with pad dimensions of 1.40 mm × 2.63 mm (0.055″ × 0.104″) and 5.43 mm center-to-center spacing (0.214″). Thermal relief and copper pour under the device improve heat dissipation and sustain 150 °C operation in dense layouts.
SMAJ13CA-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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 27.2V
- Current - Peak Pulse (10/1000µs):
- 85A (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)
SMAJ13CA-TR FAQ
1.How can I place an order for SMAJ13CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13CA-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 SMAJ13CA-TR reliable?
The price and inventory of SMAJ13CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ13CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13CA-TR?
SMAJ13CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13CA-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 SMAJ13CA-TR?
For technical support, including SMAJ13CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13CA-TR requirements.
6.How does Aetrix verify that SMAJ13CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ13CA-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 SMAJ13CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ13CA-TR?
All SMAJ13CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13CA-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 SMAJ13CA-TR part is unused and in its original packaging.
Return procedure for SMAJ13CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ13CA-TR Tags
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