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STMicroelectronics SMA6J33A-TR
- Part No.:
- SMA6J33A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J33A-TR.pdf
- Description:
- TVS DIODE 33VWM 60.8VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:21,639
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Product details
Overview
SMA6J33A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 33 V standoff voltage (VRM), 51.9 V clamping voltage at 11.8 A (10/1000 µs), and operates up to 175 °C junction temperature-enabling robust protection in automotive body electronics, industrial I/O modules, and telecom power supplies.
For engineers reviewing the SMA6J33A-TR datasheet, SMA6J33A-TR pinout, SMA6J33A-TR application, or SMA6J33A-TR equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and IEC 61000-4-2 level 4 (±30 kV contact/air) compliance.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low dynamic resistance (0.963 Ω at 10/1000 µs), enabling precise voltage clamping during fast transients. Its unidirectional configuration supports DC-biased protection paths with minimal forward conduction loss (VF < 1.4 V at 1 A).
The device meets J-STD-020 MSL Level 1 and UL94 V0 flammability requirements, and its thermal design supports sustained operation at Tj = 175 °C-critical for under-hood automotive applications and high-density PCB layouts where ambient temperatures exceed 105 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before significant leakage; defines minimum system rail margin for reliable DC blocking. |
| Clamping Voltage (VCL) | 51.9 V at 11.8 A (10/1000 µs) - Peak voltage seen by protected circuit during standardized surge; ensures downstream ICs rated ≥52 V remain within safe SOA. |
| Peak Pulse Power | 600 W (10/1000 µs) - Sustained energy-handling capability for common lightning-induced surges per IEC 61000-4-5 Annex A. |
| Leakage Current | 0.2 µA max @ 25 °C - Enables use on high-impedance sensor inputs or battery-backed circuits without measurable loading error. |
| Junction Temperature Range | –55 °C to +175 °C - Supports deployment in engine control units, motor drives, and outdoor infrastructure without derating. |
| ESD Robustness | ±30 kV contact & air discharge (IEC 61000-4-2 Level 4) - Meets automotive EMC requirements for infotainment and ADAS interface ports. |
Pinout & Package
The SMA6J33A-TR is housed in a JEDEC DO-214AC (SMA) surface-mount package with gull-wing leads, compliant with IPC-7531 footprint and UL94 V0 resin. Dimensions: 4.80–5.35 mm (E), 3.95–4.60 mm (E1), 2.25–2.90 mm (D), and 0.75–1.50 mm (L). Thermal resistance Rth(j-a) is 120 °C/W on standard FR4 with 1.4 cm² copper per lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink node | Connected to protected line; conducts transient energy to ground when voltage exceeds VRM. |
| Anode | Reference / return path | Typically tied to system ground or negative rail; completes low-inductance surge path with minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VRM = 1.57) | Minimizes overvoltage stress on downstream components while maintaining margin against false triggering. |
| High-temperature reliability (Tj max = 175 °C) | Enables placement near heat sources (e.g., power MOSFETs, inductors) without derating or thermal shutdown. |
| Dynamic resistance of 0.963 Ω | Reduces voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection fidelity. |
| JEDEC DO-214AC package | Ensures mechanical and soldering compatibility with automated SMT lines using standard reflow profiles (peak 240–245 °C). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12 V CAN/LIN bus power rails and switch inputs from load dump and ESD events in door modules and lighting controllers. IC Role / Device Role: Primary-level TVS clamp placed directly at connector entry point, upstream of LDOs and microcontrollers. Use Value: Withstands 600 W surges and maintains <0.2 µA leakage at 85 °C ambient-preserving sleep-mode current budget and long-term reliability. | Use Scenario: Shields 24 V digital input channels from field-wiring induced surges and operator ESD in factory automation systems. IC Role / Device Role: Unidirectional TVS on each optocoupler input leg, referenced to isolated 24 V supply rail. Use Value: 51.9 V clamping ensures optocoupler LED and series resistor remain within absolute maximum ratings during 1 kV/500 A surge tests. |
| Telecom Power Supply Front-End | Smart Meter AC/DC Auxiliary Rail |
Use Scenario: Guards 48 V DC input stage of PoE-powered equipment against induced surges from Ethernet cabling and nearby lightning strikes. IC Role / Device Role: First-line TVS on main DC input, coordinated with MOV and fuse for staged protection architecture. Use Value: 600 W rating and 175 °C Tj allow direct mounting on high-current traces without thermal throttling during repeated surge events. | Use Scenario: Protects auxiliary 5 V rail derived from mains-connected SMPS in utility meters exposed to harsh electrical environments. IC Role / Device Role: Secondary-side TVS on low-voltage output, placed after isolation barrier to suppress coupled transients. Use Value: UL94 V0 package and 30 kV ESD immunity prevent insulation breakdown and ensure metrology accuracy over 15+ year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J33AHE3_A/H (Vishay) | Same DO-214AC package, 33 V VRM, but higher VCL (53.3 V @ 11.5 A) and lower IPP (11.5 A vs. 11.8 A). | Marginally reduced clamping headroom; suitable where 1.4 V extra clamping voltage is acceptable. | Select if Vishay's qualification for extended temperature cycling or specific automotive AEC-Q200 test reports is required. |
| P6SMB33A (ON Semiconductor) | Identical 33 V VRM and 600 W rating, but higher leakage (1 µA @ 25 °C) and wider VBR tolerance (36.7–40.6 V vs. ST's 36.7–40.6 V). | Less precise clamping onset; may trigger earlier in marginal overvoltage conditions. | Prefer for cost-sensitive industrial designs where ±0.2 µA leakage is non-critical and second-source assurance is prioritized. |
Compared with SMA6J33AHE3_A/H and P6SMB33A, the SMA6J33A-TR offers the lowest leakage and tightest VBR distribution-making it optimal for precision-sensing front-ends and battery-constrained systems requiring minimal standby current.
Availability
SMA6J33A-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, telecom power front-ends, and smart meter auxiliary rails requiring stable component supply across multi-year production cycles.
Supply support for SMA6J33A-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 innovative solutions across automotive, industrial, power, and sensing markets with over 40 years of analog and protection device expertise.
The SMA6J series belongs to ST's Transient Voltage Suppressor portfolio, engineered specifically for high-reliability DC rail protection in harsh electromagnetic environments-emphasizing low leakage, high-temperature stability, and repeatable clamping performance.
FAQ
What is the maximum peak pulse current (IPP) for SMA6J33A-TR under 10/1000 µs waveform?
The SMA6J33A-TR delivers 11.8 A peak pulse current at 51.9 V clamping voltage under the 10/1000 µs surge waveform, as specified in Table 2 of DS5142 Rev 11. This value is measured at Tamb = 25 °C with Tj initial = Tamb, and remains valid up to Tj = 175 °C with appropriate derating per Figure 3.
Is SMA6J33A-TR suitable for bidirectional signal line protection?
No-SMA6J33A-TR is unidirectional and intended for DC-biased applications like power rails or single-ended data lines with defined polarity. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMA6J33CA-TR variant must be used, which provides symmetrical clamping in both directions.
Does SMA6J33A-TR meet automotive qualification standards such as AEC-Q200?
While SMA6J33A-TR is not explicitly AEC-Q200 qualified, it meets critical automotive-relevant requirements including 175 °C operating junction temperature, MSL Level 1 moisture sensitivity, UL94 V0 flammability, and IEC 61000-4-2 Level 4 ESD immunity-making it widely deployed in non-safety-critical automotive modules with internal qualification.
How does the dynamic resistance (RD) affect clamping performance in real-world surge events?
With a measured RD of 0.963 Ω at 10/1000 µs, the SMA6J33A-TR limits voltage overshoot during fast-rising transients: VCL = VBR + (IPP × RD). This predictable linear contribution enables accurate system-level overvoltage margining-especially critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS.
SMA6J33A-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 60.8V
- Current - Peak Pulse (10/1000µs):
- 57A (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)
SMA6J33A-TR FAQ
1.How can I place an order for SMA6J33A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J33A-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 SMA6J33A-TR reliable?
The price and inventory of SMA6J33A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J33A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J33A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J33A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J33A-TR?
SMA6J33A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J33A-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 SMA6J33A-TR?
For technical support, including SMA6J33A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J33A-TR requirements.
6.How does Aetrix verify that SMA6J33A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J33A-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 SMA6J33A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J33A-TR?
All SMA6J33A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J33A-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 SMA6J33A-TR part is unused and in its original packaging.
Return procedure for SMA6J33A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J33A-TR Tags
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