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STMicroelectronics SMAJ6.0A-TR
- Part No.:
- SMAJ6.0A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.0A-TR.pdf
- Description:
- TVS DIODE 6VWM 13.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:27,579
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Product details
Overview
SMAJ6.0A-TR from STMicroelectronics is a unidirectional 6.0 V standoff voltage TVS diode in SMA (DO-214AC) package, rated for 400 W peak pulse power (10/1000 µs), 10.3 V clamping voltage at 38.8 A surge current, and 0.2 µA leakage at 25 °C - designed to protect USB, industrial I/O, and automotive sensor interfaces against IEC 61000-4-2 ESD (±30 kV air/contact) and IEC 61000-4-4 EFT (4 kV).
For engineers reviewing the SMAJ6.0A-TR datasheet, SMAJ6.0A-TR pinout, SMAJ6.0A-TR application, or SMAJ6.0A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, junction temperature derating above 25 °C, unidirectional polarity compatibility with DC-biased lines, and IPC-7531-compliant SMA footprint layout.
Technical Context
This device operates as a silicon avalanche diode with planar junction construction, enabling low leakage (<1 µA up to 85 °C) and stable breakdown behavior across -55 °C to +150 °C junction temperature range. Its dynamic resistance of 0.075 Ω at 10/1000 µs ensures rapid voltage clamping during transient events.
The SMAJ6.0A-TR complies with JEDEC DO-214AC mechanical outline and IPC-7531 footprint standards, supports lead-free reflow per J-STD-020 MSL level 1, and achieves IEC 61000-4-2 level 4 immunity without external filtering - making it suitable for space-constrained, high-reliability DC rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 6.0 V - maximum continuous reverse operating voltage before significant leakage begins; sets minimum system rail voltage compatibility. |
| Breakdown Voltage (VBR) | 6.70–7.05 V at 10 mA - guaranteed avalanche initiation threshold; defines overvoltage trip point with ±5% tolerance. |
| Clamping Voltage (VCL) | 10.3 V at 38.8 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; must be below IC absolute maximum rating. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - energy-handling capability for standard lightning/surge waveforms; derates linearly above 25 °C ambient. |
| Leakage Current (IR) | 0.2 µA at 25 °C, 1 µA at 85 °C - negligible loading on low-power sensor or battery-backed circuits. |
| Junction Temperature Range | -55 °C to +150 °C - enables deployment in under-hood automotive, industrial PLC, and outdoor equipment environments. |
Pinout & Package
Package: SMA (DO-214AC), JEDEC registered, IPC-7531 compliant footprint, matte tin-plated leads, MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode | Reference/return path | Typically tied to system ground or lowest potential reference; completes conduction path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VRWM = 1.72) | Minimizes voltage overshoot on 5 V or 3.3 V rails while maintaining robust surge margin. |
| Planar junction technology | Enables <1 µA leakage at 85 °C and stable VBR drift (<5.9 × 10−4/°C temperature coefficient), critical for long-term sensor accuracy. |
| IEC 61000-4-2 level 4 compliance | Withstands ±30 kV contact and air discharge without degradation - eliminates need for external spark gaps in handheld devices. |
| JEDEC DO-214AC mechanical standardization | Ensures automated placement compatibility and thermal performance predictability across PCB stack-ups with FR4 and 70 µm copper. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 5 V analog sensor outputs (e.g., pressure, temperature) from ESD during factory handling and field operation. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between signal line and ground, activated only during positive transients exceeding 6.0 V. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC inputs while adding <0.5 pF capacitance at 1 V bias. |
Use Scenario: Safeguarding LIN bus transceiver I/O pins exposed to load dump and jump-start surges in door modules and seat controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS on bidirectional data line, conducting only during fault conditions to limit voltage to <10.3 V. Use Value: Maintains signal integrity during 12 V system operation while surviving 4 kV IEC 61000-4-4 burst events without parameter shift. |
| USB 2.0 Data Line Protection | PLC Digital Input Card |
|
Use Scenario: Clamping D+ and D− lines against ESD from user insertion/removal of cables in embedded host ports. IC Role / Device Role / Timing Role: Dual unidirectional TVS pair (one per line), grounded cathode configuration preserving DC bias and signal swing. Use Value: Adds <1.5 pF total capacitance per line at 0 V, meeting USB 2.0 eye diagram jitter requirements while passing ±15 kV HBM testing. |
Use Scenario: Shielding 24 V digital input optocoupler front-end from induced surges on factory floor wiring harnesses. IC Role / Device Role / Timing Role: High-energy TVS mounted directly at connector entry point, diverting >38 A transient current away from series resistor and LED driver. Use Value: Enables 400 W surge handling without derating at 70 °C ambient - extends mean time between failures in dusty, high-vibration environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.0A from Vishay (SM6A6.0) | VBR min = 6.4 V (vs. ST's 6.7 V); VCL = 10.5 V at 38.5 A; 0.5 µA leakage at 25 °C. | Higher clamping voltage reduces margin for 5 V logic; higher leakage may affect ultra-low-power wake-on-event circuits. | Select when legacy Vishay BOM alignment is required and 0.2 V higher VCL is acceptable. |
| P6SMB6.0A from ON Semiconductor | VRWM = 6.0 V; VCL = 10.5 V at 38.5 A; PPP = 600 W; DO-214AA package (slightly larger than DO-214AC). | Higher power rating allows longer surge duration tolerance but requires larger PCB footprint and has 20% higher thermal resistance. | Prefer for systems requiring >400 W headroom or where DO-214AA placement infrastructure already exists. |
Compared with SMAJ6.0A-TR, the Vishay SM6A6.0 offers tighter VRWM control but sacrifices clamping margin and leakage performance, while the ON Semi P6SMB6.0A trades package compactness for extended surge endurance - making ST's version optimal for space-constrained, thermally demanding 5 V interface protection.
Availability
SMAJ6.0A-TR is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, USB 2.0 port protection, and PLC digital input cards requiring stable component supply with full traceability and no obsolescence risk through 2030.
Supply support for SMAJ6.0A-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 since 1987.
The SMAJ series belongs to ST's Transient Voltage Suppression portfolio, engineered specifically for high-reliability DC rail and signal-line protection in harsh electromagnetic environments - emphasizing low leakage, precise clamping, and JEDEC-standardized manufacturability.
FAQ
What is the maximum allowable PCB trace length between SMAJ6.0A-TR and the protected IC?
Trace inductance directly impacts clamping effectiveness: for 38.8 A surge current with 10 ns rise time, every 1 nH adds ~0.4 V overshoot. ST recommends ≤5 mm total trace length (including ground return) to keep added inductance below 3 nH. Use wide, short paths with dedicated ground plane coupling beneath the device.
Can SMAJ6.0A-TR be used to protect a 3.3 V microcontroller I/O pin?
No - its 6.0 V standoff voltage exceeds typical 3.3 V I/O absolute maximum ratings (usually 4.0 V). Using it risks permanent damage during normal operation. For 3.3 V rails, select SMAJ3.3A (VRWM = 3.3 V) or SMAJ5.0A (VRWM = 5.0 V) with verified VCL < 4.0 V at expected surge current.
Does SMAJ6.0A-TR require derating at elevated ambient temperatures?
Yes - peak pulse power drops linearly with junction temperature: at 85 °C ambient (assuming 25 °C rise), Tj ≈ 110 °C, reducing PPP to ~280 W (per Figure 3). Designers must verify worst-case surge energy (½ × L × I²) remains below derated PPP and confirm thermal relief via copper area under leads per Figure 12.
How does the unidirectional configuration affect circuit layout versus bidirectional types?
Unidirectional SMAJ6.0A-TR must be oriented with cathode toward the protected line and anode to ground - incorrect polarity prevents clamping during negative transients. Bidirectional variants (e.g., SMAJ6.0CA) eliminate orientation concerns but exhibit higher capacitance and slightly reduced ESD robustness due to dual-junction structure.
SMAJ6.0A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6V
- Voltage - Breakdown (Min):
- 6.7V
- Voltage - Clamping (Max) @ Ipp:
- 13.7V
- Current - Peak Pulse (10/1000µs):
- 170A (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)
SMAJ6.0A-TR FAQ
1.How can I place an order for SMAJ6.0A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.0A-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 SMAJ6.0A-TR reliable?
The price and inventory of SMAJ6.0A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.0A-TR is usually 5 days.
3.What payment methods are accepted for SMAJ6.0A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.0A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.0A-TR?
SMAJ6.0A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.0A-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 SMAJ6.0A-TR?
For technical support, including SMAJ6.0A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.0A-TR requirements.
6.How does Aetrix verify that SMAJ6.0A-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ6.0A-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 SMAJ6.0A-TR meets industry standards.
7.What is the process for return or replacement of SMAJ6.0A-TR?
All SMAJ6.0A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.0A-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 SMAJ6.0A-TR part is unused and in its original packaging.
Return procedure for SMAJ6.0A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ6.0A-TR Tags
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