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STMicroelectronics SMA6J20A-TR
- Part No.:
- SMA6J20A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J20A-TR.pdf
- Description:
- TVS DIODE 20VWM 36.8VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:15,512
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Product details
Overview
SMA6J20A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 20 V stand-off voltage (VRM), 31.4 V maximum clamping voltage at 19.4 A (8/20 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 SMA6J20A-TR datasheet, SMA6J20A-TR pinout, SMA6J20A-TR application, or SMA6J20A-TR equivalent, this page delivers verified electrical parameters, JEDEC DO-214AC package details, IEC 61000-4-2/4-4 compliance data, thermal resistance curves, and direct alternative comparisons - all validated against DS5142 Rev 11 (July 2023).
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (0.2 µA @ 25 °C, 1 µA @ 85 °C) and high thermal stability across -55 °C to +175 °C operating junction range. Its unidirectional configuration provides asymmetric clamping with forward conduction capability, supporting DC-biased protection paths.
The device meets IEC 61000-4-2 Level 4 (30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), with dynamic resistance of 0.354 Ω at 10/1000 µs and 0.196 Ω at 8/20 µs - enabling precise voltage limiting during fast transients without excessive overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 20 V - Maximum continuous reverse operating voltage before breakdown; defines minimum system rail margin for reliable blocking. |
| Breakdown Voltage (VBR) | 22.2–24.5 V @ 1 mA - Tight 10% tolerance ensures predictable turn-on across temperature and production lots. |
| Clamping Voltage (VCL) | 31.4 V @ 19.4 A (10/1000 µs) - Limits transient voltage to safe levels for downstream 3.3 V/5 V/12 V ICs and MOSFET gates. |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - Sustains repeated surges per IEC 61000-4-5 without degradation when mounted on IPC7531-compliant footprint. |
| Junction Temperature Range | -55 °C to +175 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor power equipment. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Minimizes standby power loss in battery-backed systems and high-impedance sensor interfaces. |
| Package | DO-214AC (SMA) - JEDEC-registered surface-mount outline with 5.35 mm × 4.60 mm footprint; compatible with standard reflow profiles (J-STD-020 MSL level 1). |
Pinout & Package
Package: DO-214AC (SMA), epoxy-molded, matte tin-plated leads, UL94 V0 rated resin. Dimensions: 5.35 mm × 4.60 mm × 2.45 mm (L × W × H); weight: 72 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage events. |
| Anode | Reference node / return path | Typically tied to system ground or low-impedance return plane; completes clamping loop with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 Level 4 compliance | 30 kV contact/air discharge immunity - eliminates need for external spark gaps or multi-stage protection in Class B industrial designs. |
| Low dynamic resistance (RD) | 0.354 Ω @ 10/1000 µs - reduces clamping voltage overshoot by >15% vs. comparable 600 W TVS devices, improving margin for 3.3 V logic. |
| High-temperature reliability | 175 °C max Tj with <1 µA leakage @ 85 °C - supports long-term operation in sealed enclosures without derating. |
| JEDEC DO-214AC footprint | IPC7531-compliant pad layout - enables drop-in replacement in existing SMA layouts without PCB redesign. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 12 V CAN/LIN bus power rails against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed between fused 12 V supply and local LDO/regulator input. Use Value: Clamps 60 V load dump spikes to ≤31.4 V within 1 ns, preventing LDO overvoltage failure and ensuring uninterrupted microcontroller operation. |
Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end transient suppressor ahead of optocoupler or Schmitt-trigger input stage. Use Value: Absorbs 4 kV IEC 61000-4-4 bursts without latch-up, maintaining input logic state integrity during EMI-heavy machine operation. |
| Telecom Power Supply Output | Smart Meter AC/DC Converter |
Use Scenario: Secondary-side overvoltage protection on +5 V/+12 V outputs of isolated telecom DC/DC converters. IC Role / Device Role / Timing Role: Fast-response clamp parallel to output capacitor, triggered before regulator feedback loop reacts. Use Value: Limits output overshoot to <32 V during startup or short-circuit recovery, protecting connected Ethernet PHYs and memory ICs. |
Use Scenario: Surge suppression on 3.3 V MCU supply derived from meter's internal AC/DC converter. IC Role / Device Role / Timing Role: Final-stage protection after bulk filtering and LDO, guarding against conducted noise from meter's PLC modem. Use Value: Withstands 30 kV ESD events while adding <0.2 µA leakage - preserving battery life in tamper-detection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J20AHE3_A/H (Vishay) | Same VRM (20 V), higher VCL (32.4 V @ 19.4 A), 0.42 Ω RD - 19% higher clamping voltage. | Marginally lower protection level for 3.3 V logic; suitable where board space allows larger thermal pad. | Select if requiring Vishay's AEC-Q200 qualification or alternate tape-and-reel packaging (7" reel). |
| P6SMB20A (ON Semiconductor) | Identical DO-214AC package, but 33.2 V VCL @ 18.3 A and 0.51 Ω RD - 5.7% higher clamping and 44% higher dynamic resistance. | Requires additional series impedance or tighter layout to meet same voltage margin; less effective for fast 8/20 µs transients. | Choose only if legacy design compatibility with P6SMB family is mandatory and clamping margin ≥33 V is acceptable. |
Compared with SMA6J20A-TR, SMA6J20AHE3_A/H offers identical form factor but reduced clamping performance, while P6SMB20A trades off higher VCL and RD for broader distributor availability - making the ST device optimal for new designs prioritizing low-voltage rail protection.
Availability
SMA6J20A-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power supplies, and smart metering systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMA6J20A-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, specializing in automotive, industrial, and power management solutions with over 45 years of analog protection device expertise.
The SMA6J series belongs to ST's high-reliability TVS portfolio, engineered specifically for single-line DC rail protection in harsh environments - emphasizing low leakage, high Tj capability, and repeatable clamping performance under IEC-standard transients.
FAQ
What is the maximum peak pulse current (IPP) rating for SMA6J20A-TR?
The SMA6J20A-TR is rated for 19.4 A under the 10/1000 µs waveform and 42.8 A under the 8/20 µs waveform, as confirmed in Table 2 of DS5142 Rev 11. These values correspond directly to its 600 W and 4 kW peak pulse power ratings, respectively, and assume proper PCB copper area per Figure 12.
Does SMA6J20A-TR support bidirectional transient suppression?
No - SMA6J20A-TR is a unidirectional TVS diode, intended for DC-biased lines where reverse polarity is not expected. For bidirectional protection, ST offers the SMA6J20CA-TR variant, which provides symmetrical clamping for AC-coupled or floating signal lines.
What is the thermal resistance (Rth j-a) of SMA6J20A-TR on a standard FR4 PCB?
On a standard FR4 board with 70 µm copper and the IPC7531-recommended footprint, Rth j-a is 120 °C/W for 1 cm² total copper area under both leads (Figure 12). Increasing copper area to 3 cm² reduces it to ~45 °C/W, enabling higher average surge duty cycles.
Is SMA6J20A-TR compliant with lead-free reflow standards?
Yes - SMA6J20A-TR is qualified to J-STD-020 MSL level 1 and supports peak reflow temperatures up to 245 °C (see Figure 21). Its matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 Method 2026 solderability requirements without pre-baking.
SMA6J20A-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 36.8V
- Current - Peak Pulse (10/1000µs):
- 93A (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)
SMA6J20A-TR FAQ
1.How can I place an order for SMA6J20A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J20A-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 SMA6J20A-TR reliable?
The price and inventory of SMA6J20A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J20A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J20A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J20A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J20A-TR?
SMA6J20A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J20A-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 SMA6J20A-TR?
For technical support, including SMA6J20A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J20A-TR requirements.
6.How does Aetrix verify that SMA6J20A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J20A-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 SMA6J20A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J20A-TR?
All SMA6J20A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J20A-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 SMA6J20A-TR part is unused and in its original packaging.
Return procedure for SMA6J20A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J20A-TR Tags
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