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STMicroelectronics SMA6J12A-TR
- Part No.:
- SMA6J12A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J12A-TR.pdf
- Description:
- TVS DIODE 12VWM 23.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,911
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Product details
Overview
SMA6J12A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression diode designed for ESD and surge protection in DC power rails and signal lines. It features a 12 V standoff voltage (VRM), 18.8 V clamping voltage at 31 A peak pulse current (8/20 μs), and operates up to 175 °C junction temperature-ideal for automotive body electronics, industrial I/O modules, and telecom power interfaces.
For engineers reviewing the SMA6J12A-TR datasheet, SMA6J12A-TR pinout, SMA6J12A-TR application, or SMA6J12A-TR equivalent, key selection criteria include clamping performance under IEC 61000-4-2 (30 kV contact/air), low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and thermal robustness for high-reliability PCB layouts.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low dynamic resistance (0.133 Ω at 10/1000 μs), enabling precise voltage clamping during fast transients. Its unidirectional configuration supports DC-biased protection paths with minimal forward voltage drop (≤1.4 V @ 1 A).
The device complies with IEC 61000-4-2 Level 4 (30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), and is rated for 600 W peak pulse power (10/1000 μs) with derating above 25 °C per Figure 3 in DS5142 Rev 11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 12 V - maximum continuous reverse operating voltage before significant leakage |
| Breakdown Voltage (VBR) | 13.3–14.7 V @ 1 mA - ensures reliable triggering margin above nominal rail |
| Clamping Voltage (VCL) | 18.8 V @ 31 A (8/20 μs) - limits downstream IC stress during surge events |
| Peak Pulse Power | 600 W (10/1000 μs) - sustains common lightning-induced surges in industrial environments |
| Leakage Current | 0.2 µA @ 25 °C - preserves battery life and signal integrity in low-power sensor nodes |
| Junction Temperature | −55 to +175 °C - enables deployment in under-hood automotive or high-ambient industrial enclosures |
| Package | DO-214AC (SMA) - IPC-7531-compliant footprint with 2.25–2.90 mm body width and 4.80–5.35 mm length |
Pinout & Package
Package: DO-214AC (SMA), JEDEC-registered, surface-mount, single-diode configuration with cathode band marking. Dimensions per DS5142 Rev 11: D = 2.25–2.90 mm, E = 4.80–5.35 mm, E1 = 3.95–4.60 mm, L = 0.75–1.50 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / low-side connection | Connected to ground or negative rail; defines unidirectional conduction direction |
| Cathode | Protected line input / positive rail connection | Connected to the line being protected; clamps to anode when overvoltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR) | 1.34–1.41 - minimizes voltage overshoot during fast transients, protecting 12 V logic and analog ICs |
| High-temperature operation | 175 °C max Tj - eliminates derating concerns in sealed enclosures or near heat sources |
| UL94 V0 resin housing | Flame-retardant epoxy - satisfies safety requirements for industrial and transportation end equipment |
| JEDEC MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH - simplifies SMT assembly without baking preconditioning |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs against load dump and ESD in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground to clamp transients while preserving signal integrity below 200 kbps. Use Value: Withstands 30 kV contact discharge per IEC 61000-4-2 and maintains <0.2 µA leakage at 25 °C to avoid false wake-up in sleep mode. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller backplanes exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary surge suppressor on each input channel, mounted directly at terminal block entry point. Use Value: Delivers 18.8 V clamping at 31 A (8/20 μs), limiting voltage seen by optocoupler input to safe levels during 4 kV IEC 61000-4-4 events. |
| Telecom Power Supply Rail | Medical Sensor Interface |
Use Scenario: Secondary protection on +12 V DC-DC output rails feeding baseband processors in small-cell radio units. IC Role / Device Role / Timing Role: Fast-response clamping device placed after primary filter stage to absorb residual switching spikes and ESD. Use Value: 600 W (10/1000 μs) rating handles repetitive surges from nearby RF switching; 175 °C rating supports compact thermal design. | Use Scenario: ESD protection for analog front-end inputs of portable patient monitors connected to disposable biopotential electrodes. IC Role / Device Role / Timing Role: Low-leakage TVS on differential sensor lines to prevent electrostatic damage without degrading signal-to-noise ratio. Use Value: 0.2 µA leakage at 25 °C and 1 µA at 85 °C avoids DC offset drift in high-gain instrumentation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J12AHE3_A/H | Same electrical specs; halogen-free, RoHS-compliant variant with identical DO-214AC package | No functional difference; preferred where environmental compliance mandates halogen-free materials | Select for medical or consumer products requiring full ECOPACK2 certification |
| P6SMB12A | 600 W rating, same VRM (12 V), but higher VCL (20.1 V @ 30 A) and larger SMB package (5.3 × 4.5 mm vs SMA 5.3 × 2.9 mm) | Less space-efficient; requires larger PCB footprint and higher thermal mass for equivalent surge handling | Choose only if existing layout uses SMB or requires higher mechanical robustness in high-vibration environments |
Compared with SMA6J12AHE3_A/H, the SMA6J12A-TR offers identical protection performance with standard RoHS compliance; versus P6SMB12A, it delivers tighter clamping and 30 % smaller footprint-critical for dense telecom and automotive PCBs.
Availability
SMA6J12A-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power supply rails, and medical sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMA6J12A-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 protection devices for industrial, automotive, and consumer markets.
The SMA6J series belongs to ST's transient voltage suppression portfolio, engineered specifically for high-reliability, high-temperature DC rail protection with stringent ESD and surge immunity per IEC and MIL standards.
FAQ
What is the maximum clamping voltage of SMA6J12A-TR under an 8/20 μs surge?
The maximum clamping voltage is 18.8 V at 31 A peak pulse current for an 8/20 μs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the 10⁻⁴/°C temperature coefficient (αT), reaching approximately 20.1 V at 125 °C junction temperature per the VCL(Tj) formula in DS5142.
Is SMA6J12A-TR bidirectional or unidirectional?
SMA6J12A-TR is unidirectional: it conducts only during reverse-bias overvoltage events, with the cathode terminal connected to the protected line and anode to ground. The "A" suffix denotes unidirectional; "CA" indicates the bidirectional version (e.g., SMA6J12CA-TR), which clamps in both polarities.
Does SMA6J12A-TR meet automotive qualification standards?
While not AEC-Q200 qualified out-of-box, SMA6J12A-TR meets critical automotive-relevant requirements: 175 °C operating junction temperature, IEC 61000-4-2 Level 4 ESD (30 kV), and IEC 61000-4-4 Level 4 surge (4 kV). It is widely used in non-safety-critical automotive modules such as body control units and infotainment power rails.
What is the recommended PCB footprint for SMA6J12A-TR?
The recommended footprint follows IPC-7531 for DO-214AC (SMA): pad length 5.43 mm, pad width 1.40 mm, center-to-center spacing 3.90 mm, and copper area ≥1.64 cm² per lead to maintain thermal resistance ≤4.5 °C/W (per Figure 12 in DS5142). Use FR4 board with 70 µm copper thickness.
SMA6J12A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 23.5V
- Current - Peak Pulse (10/1000µs):
- 157A (8/20µs)
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J12A-TR FAQ
1.How can I place an order for SMA6J12A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J12A-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 SMA6J12A-TR reliable?
The price and inventory of SMA6J12A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J12A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J12A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J12A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J12A-TR?
SMA6J12A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J12A-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 SMA6J12A-TR?
For technical support, including SMA6J12A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J12A-TR requirements.
6.How does Aetrix verify that SMA6J12A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J12A-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 SMA6J12A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J12A-TR?
All SMA6J12A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J12A-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 SMA6J12A-TR part is unused and in its original packaging.
Return procedure for SMA6J12A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J12A-TR Tags
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