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STMicroelectronics SMAJ6.5A-TR
- Part No.:
- SMAJ6.5A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5A-TR.pdf
- Description:
- TVS DIODE 6.5VWM 14.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:22,056
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Product details
Overview
SMAJ6.5A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level ESD and surge protection in low-voltage DC power rails and signal lines. It features a 6.5 V stand-off voltage (VRM), 11.2 V clamping voltage (VCL) at 35.7 A peak pulse current (IPP), and 400 W peak pulse power (10/1000 µs), making it suitable for protecting USB ports, industrial sensors, and automotive body electronics against IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV) transients.
For engineers reviewing the SMAJ6.5A-TR datasheet, SMAJ6.5A-TR pinout, SMAJ6.5A-TR application, or SMAJ6.5A-TR equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at elevated temperature (≤1 µA @ 85 °C), junction temperature capability (up to +150 °C), and SMA package thermal performance on standard FR4 PCBs.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal bias (VRM = 6.5 V), it exhibits ≤20 µA reverse leakage; during transient events, it avalanches rapidly to clamp voltage (VCL = 11.2 V @ 35.7 A, 10/1000 µs), limiting stress on downstream components. Its planar junction construction ensures stable breakdown characteristics and low dynamic resistance (RD = 0.091 Ω).
It complies with JEDEC DO-214AC (SMA) mechanical outline and IPC-7531 footprint standards, supports reflow soldering per J-STD-020 MSL Level 1, and meets UL94 V0 flammability and IEC 61000-4-2/4-4 immunity requirements without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 6.5 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system rail voltage compatibility. |
| Breakdown Voltage (VBR) | 7.20–7.58 V @ IBR = 10 mA - Confirmed avalanche initiation range; ensures reliable turn-on before protected IC damage threshold. |
| Clamping Voltage (VCL) | 11.2 V @ IPP = 35.7 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) - Sustained energy-handling capacity for common lightning-induced surges; derates linearly above 25 °C junction temperature. |
| Leakage Current (IRM) | ≤20 µA @ 25 °C, ≤1 µA @ 85 °C - Low standby loss critical for battery-powered sensor nodes and always-on interfaces. |
| Junction Temperature (Tj) | -55 to +150 °C - Enables operation in under-hood automotive, industrial PLC, and outdoor IoT enclosures without derating. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 5.35 mm × 4.60 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: DO-214AC (SMA), JEDEC-registered, IPC-7531 compliant footprint. Dimensions: 5.35 mm × 4.60 mm × 2.45 mm (L × W × H), with matte tin-plated leads rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / return path | Typically tied to system ground or low-impedance return plane; completes shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD robustness | ±30 kV contact/air discharge - Eliminates need for secondary ESD protection in USB 2.0, CAN, and RS-485 interfaces. |
| Low dynamic resistance (RD) | 0.091 Ω - Minimizes clamping voltage rise under high di/dt surges, improving protection margin for fast-edge transients. |
| High-temperature leakage stability | ≤1 µA @ 85 °C - Ensures no measurable power drain in thermally stressed environments (e.g., engine control units). |
| Planar junction technology | Uniform breakdown distribution - Delivers consistent VBR and VCL across production lots and temperature ranges. |
| UL94 V0 & J-STD-020 MSL 1 | Flame-retardant epoxy housing and moisture-insensitive packaging - Supports lead-free reflow without popcorn cracking or delamination. |
Applications
| USB 2.0 Data Lines | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting D+ and D− lines of USB 2.0 peripherals against ESD events during hot-plug insertion in infotainment systems. IC Role / Device Role: Unidirectional shunt TVS placed between data line and chassis ground, clamping transients before they reach USB transceiver IC. Use Value: Maintains signal integrity with <1 pF junction capacitance (per datasheet curve Fig. 7), avoids data eye distortion while meeting ±30 kV IEC 61000-4-2. |
Use Scenario: Safeguarding 5 V sensor supply rails (e.g., rain sensor, door lock actuator) from load-dump and ISO 7637-2 pulse 1/2a transients. IC Role / Device Role: Primary overvoltage clamp on low-voltage power input, coordinated with upstream fuse and downstream LDO. Use Value: Withstands 150 °C junction temperature and delivers 400 W surge handling, enabling compact placement near connectors without thermal derating. |
| Industrial RS-485 Transceivers | Smart Meter Power Input |
|
Use Scenario: Shielding half-duplex RS-485 bus lines (A/B) in factory automation gateways from induced lightning surges on long cable runs. IC Role / Device Role: Line-to-ground TVS pair (one per conductor) providing symmetric clamping to protect isolated transceiver inputs. Use Value: 11.2 V clamping voltage ensures transceiver's ±7 V common-mode range remains unexceeded; DO-214AC allows dense layout on 2-layer PCBs. |
Use Scenario: Front-end surge suppression on 5 V auxiliary power input of electricity meters exposed to utility grid transients. IC Role / Device Role: First-stage protector before DC-DC converter, absorbing repetitive 4 kV IEC 61000-4-4 pulses without degradation. Use Value: 0.091 Ω RD limits voltage overshoot during 8/20 µs surges, and 20 µA max leakage preserves meter battery life during standby. |
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-TR | Lower VRM (6.0 V), lower VCL (10.3 V @ 38.8 A), tighter VBR tolerance (6.70–7.05 V) | Better suited for 5.5 V nominal rails where 6.5 V VRM risks false triggering | Select when system VDD has <0.5 V headroom above nominal; verify VCL stays below IC absolute max rating. |
| SMAJ7.0A-TR | Higher VRM (7.0 V), higher VCL (11.7 V @ 34.2 A), same PPP (400 W) | Preferred for 6.5–7.0 V rails where 6.5 V VRM causes excessive leakage or marginal margin | Choose for newer microcontrollers with 6.8 V VDD max; confirms 11.7 V clamping remains within safe zone. |
Compared with SMAJ6.5A-TR, SMAJ6.0A-TR offers tighter clamping but reduced voltage margin, while SMAJ7.0A-TR trades slightly higher clamping for improved reliability on higher-voltage rails-both retain identical DO-214AC packaging and thermal performance.
Availability
SMAJ6.5A-TR is available at Aetrix Electronics and suitable for USB interface protection, automotive BCM power rails, industrial RS-485 networks, and smart meter auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMAJ6.5A-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, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, low-leakage, surface-mount TVS diodes targeting IEC-compliant ESD/surge protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum allowable PCB copper area under each SMAJ6.5A-TR lead for optimal thermal performance?
Per Figure 12 in DS1251 Rev 15, thermal resistance (Rth(j-a)) drops from ~4.5 °C/W to ~2.0 °C/W when copper area increases from 0 cm² to 4 cm² per lead on FR4 (70 µm Cu). For continuous 150 °C operation, ≥2.5 cm² per lead is recommended to maintain junction temperature within spec under 400 W pulse conditions.
Can SMAJ6.5A-TR be used in bidirectional signal protection applications?
No-SMAJ6.5A-TR is unidirectional only (anode-cathode polarity). For bidirectional protection (e.g., RS-485 A/B lines), SMAJ6.5CA-TR must be used. Using SMAJ6.5A-TR on AC-coupled or symmetrical signals risks forward conduction and permanent damage during negative transients.
How does junction temperature affect clamping voltage in SMAJ6.5A-TR?
VCL increases with junction temperature at αT = 6.1 × 10⁻⁴ /°C. At 125 °C, VCL rises by ~0.61 V versus 25 °C (11.2 V → ~11.8 V @ 35.7 A). This is calculated using VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)], confirmed in Table 2 footnote 2.
Is SMAJ6.5A-TR compliant with RoHS and REACH regulations?
Yes-SMAJ6.5A-TR carries ST's ECOPACK2 designation, confirming compliance with EU RoHS Directive 2011/65/EU (Pb-free, Cd-free, Hg-free, Cr⁶⁺-free, PBB/PBDE-free) and REACH SVHC thresholds. Full material declarations are available via ST's product change notifications portal.
SMAJ6.5A-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):
- 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)
SMAJ6.5A-TR FAQ
1.How can I place an order for SMAJ6.5A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5A-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 SMAJ6.5A-TR reliable?
The price and inventory of SMAJ6.5A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ6.5A-TR is usually 5 days.
3.What payment methods are accepted for SMAJ6.5A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5A-TR?
SMAJ6.5A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5A-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 SMAJ6.5A-TR?
For technical support, including SMAJ6.5A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5A-TR requirements.
6.How does Aetrix verify that SMAJ6.5A-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5A-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 SMAJ6.5A-TR meets industry standards.
7.What is the process for return or replacement of SMAJ6.5A-TR?
All SMAJ6.5A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5A-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 SMAJ6.5A-TR part is unused and in its original packaging.
Return procedure for SMAJ6.5A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ6.5A-TR Tags
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