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STMicroelectronics SMAJ6.5CA-TR
- Part No.:
- SMAJ6.5CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5CA-TR.pdf
- Description:
- TVS DIODE 6.5VWM 14.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:13,245
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Product details
Overview
SMAJ6.5CA-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 6.5 V standoff voltage (VRM), 11.2 V clamping voltage at 35.7 A (10/1000 μs), 400 W peak pulse power, and operates up to 150 °C junction temperature-used in USB ports, industrial sensor interfaces, and automotive body control modules.
For engineers reviewing the SMAJ6.5CA-TR datasheet, SMAJ6.5CA-TR pinout, SMAJ6.5CA-TR application, or SMAJ6.5CA-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 uses planar silicon junction technology to achieve stable breakdown characteristics and low dynamic resistance (0.091 Ω at 25 °C). Its bidirectional structure enables symmetric clamping on both polarities without external polarity constraints, making it suitable for AC-coupled or floating signal paths.
The TVS operates with a defined reverse standoff voltage (6.5 V), breakdown voltage range (7.20–7.58 V at 10 mA), and thermal coefficient αT = 6.1 × 10⁻⁴ /°C-enabling accurate VBR and VCL derating across its –55 °C to +150 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 6.5 V - Maximum continuous reverse working voltage before significant conduction begins. |
| Breakdown Voltage (VBR) | 7.20–7.58 V at 10 mA - Confirmed avalanche onset range ensuring predictable turn-on during transients. |
| Clamping Voltage (VCL) | 11.2 V at 35.7 A (10/1000 μs) - Peak voltage seen by protected circuit under standard surge stress. |
| Peak Pulse Power (PPP) | 400 W (10/1000 μs) - Sustained energy absorption capability for common lightning-induced surges. |
| Leakage Current (IRM) | ≤20 µA at 6.5 V, 25 °C - Minimal loading on low-power sensor or battery-backed circuits. |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in under-hood automotive or industrial ambient environments. |
| ESD Rating | ±30 kV contact/air discharge (IEC 61000-4-2 Level 4) - Full immunity to human-body-model ESD events. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, JEDEC-registered outline with 2.25–2.90 mm body width, 4.80–5.35 mm length, and 1.90–2.45 mm height. Compatible with IPC-7531 footprint and reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for bidirectional operation | Not polarity-sensitive; band denotes center tap of symmetrical junction-both terminals behave identically under reverse or forward surge. |
| Anode (Opposite Band) | Reference terminal for bidirectional operation | Electrically identical to cathode; no functional distinction-device conducts equally in either direction above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity concerns. |
| Low dynamic resistance (RD) | 0.091 Ω at 25 °C ensures minimal voltage overshoot during fast 8/20 μs surges. |
| High-temperature reliability | Rated to 150 °C Tj with <1 µA leakage at 85 °C-supports long-term stability in thermally constrained PCB layouts. |
| IEC 61000-4-4 Level 4 compliance | Withstands 4 kV ring-wave surges-meets industrial and automotive EMC requirements without additional filtering. |
| Planar junction construction | Delivers tight VBR tolerance and repeatable clamping performance across manufacturing lots. |
Applications
| USB 2.0 Data Lines | Automotive LIN Bus |
|---|---|
Use Scenario: Protecting D+ and D– lines against ESD events during cable hot-plug in consumer docking stations. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient voltage to <12 V while preserving signal integrity below 480 Mbps. Use Value: Prevents PHY damage without adding capacitance (>100 pF at 1 V) that would degrade eye diagram margin. | Use Scenario: Safeguarding LIN transceiver pins against load-dump and jump-start induced transients in door module ECUs. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing >100 A surges within 1 ns to protect 12 V tolerant I/O structures. Use Value: Maintains bus availability during 12 V system faults-no latch-up or permanent degradation observed after repeated 400 W pulses. |
| Industrial RS-485 Transceivers | Smart Meter Sensor Inputs |
Use Scenario: Shielding half-duplex differential pairs in utility meter communication interfaces exposed to field wiring surges. IC Role / Device Role / Timing Role: Common-mode transient suppressor placed across A/B lines to limit differential and common-mode overvoltage simultaneously. Use Value: Clamps to 11.2 V within 1 ns, preventing transceiver latch-up while supporting >10 kV surge immunity per IEC 61000-4-4. | Use Scenario: Guarding analog inputs of metrology ADCs connected to current transformers or temperature sensors in outdoor enclosures. IC Role / Device Role / Timing Role: Low-leakage (≤20 µA) front-end protector preserving input bias accuracy and offset stability over temperature. Use Value: Adds <0.5 mV error at full-scale input-negligible impact on 0.1% metering accuracy class compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.5CA | Same VRM/VBR/VCL specs but in larger DO-214AA (SMB) package; 600 W PPP rating. | Higher power handling suits higher-energy surges but requires 30% more board area. | Select when surge threat exceeds 400 W or PCB layout allows SMB footprint. |
| P6SMB6.5CA | Identical electrical specs and DO-214AA package; manufactured by Vishay; RoHS-compliant variant. | No functional difference; validated drop-in replacement with same thermal profile and solderability. | Choose for dual-sourcing flexibility or specific distributor inventory alignment. |
Compared with SMBJ6.5CA and P6SMB6.5CA, SMAJ6.5CA-TR offers optimal space efficiency for compact designs where 400 W surge immunity suffices-its smaller DO-214AC footprint saves 30% board area without sacrificing ESD robustness or thermal derating capability.
Availability
SMAJ6.5CA-TR is available at Aetrix Electronics and suitable for USB interface protection, automotive LIN bus safeguarding, and industrial RS-485 transceiver hardening requiring stable component supply across high-mix production runs.
Supply support for SMAJ6.5CA-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 SMAJ series belongs to ST's transient protection product line, engineered specifically for high-reliability, low-leakage ESD and surge suppression in space-constrained, thermally demanding applications.
FAQ
What is the maximum clamping voltage for SMAJ6.5CA-TR under an 8/20 μs surge?
The clamping voltage is 14.5 V at 160 A for an 8/20 μs waveform, measured per IEC 61000-4-5 test conditions. This value reflects worst-case voltage seen by downstream circuitry during fast-rising transients and is confirmed in Table 2 of DS1251 Rev 15.
Can SMAJ6.5CA-TR be used in place of a unidirectional TVS like SMAJ6.5A?
No-it is bidirectional and lacks polarity-specific anode/cathode functionality. Substituting it for SMAJ6.5A would expose protected circuits to forward conduction during normal operation if DC bias is present, potentially causing latch-up or excessive leakage. Use only where symmetrical clamping is required.
Does SMAJ6.5CA-TR meet automotive qualification standards?
While not AEC-Q200 qualified itself, it is widely deployed in automotive subsystems (e.g., LIN, CAN FD stubs, infotainment USB) due to its 150 °C Tj rating, MSL level 1 moisture sensitivity, and IEC 61000-4-2/4-4 compliance-commonly accepted for non-safety-critical modules per OEM design guidelines.
How does junction temperature affect its clamping performance?
VCL increases linearly with junction temperature at αT = 6.1 × 10⁻⁴ /°C. At 125 °C, VCL rises ~0.62 V above its 25 °C value-verified using the formula VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)], ensuring predictable derating in thermally dense layouts.
SMAJ6.5CA-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):
- 6.5V
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 14.5V
- Current - Peak Pulse (10/1000µs):
- 160A (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)
SMAJ6.5CA-TR FAQ
1.How can I place an order for SMAJ6.5CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5CA-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 SMAJ6.5CA-TR reliable?
The price and inventory of SMAJ6.5CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ6.5CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5CA-TR?
SMAJ6.5CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5CA-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 SMAJ6.5CA-TR?
For technical support, including SMAJ6.5CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5CA-TR requirements.
6.How does Aetrix verify that SMAJ6.5CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5CA-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 SMAJ6.5CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ6.5CA-TR?
All SMAJ6.5CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5CA-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 SMAJ6.5CA-TR part is unused and in its original packaging.
Return procedure for SMAJ6.5CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ6.5CA-TR Tags
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