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STMicroelectronics SMA6J188A-TR
- Part No.:
- SMA6J188A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J188A-TR.pdf
- Description:
- TVS DIODE 188VWM 323VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
SMA6J188A-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 18 V stand-off voltage (VRM), 28.3 V clamping voltage at 21.5 A (10/1000 µs), ≤0.2 µA leakage at 25 °C, and operates up to 175 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMA6J188A-TR datasheet, SMA6J188A-TR pinout, SMA6J188A-TR application, or SMA6J188A-TR equivalent, key selection criteria include clamping performance under IEC 61000-4-2 (30 kV contact/air), low dynamic resistance (9.2 Ω), thermal robustness (Tj max = 175 °C), and SMA package compatibility with IPC7531 footprint.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage current and high thermal stability, enabling reliable operation in high-temperature environments such as engine bay electronics and industrial motor drives. Its unidirectional configuration provides asymmetric clamping optimized for DC-biased lines.
The device meets IEC 61000-4-2 Level 4 (30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), with clamping voltage defined by VCL = VBR(max) + RD × IPP. Dynamic resistance (RD = 9.2 Ω) and temperature coefficient αT = 10⁻⁴/°C enable accurate overvoltage prediction across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 18 V - maximum continuous reverse working voltage before breakdown; defines safe DC bias margin. |
| Breakdown Voltage (VBR min) | 20.0 V at 1 mA - guaranteed conduction onset; ensures early clamping during transients. |
| Clamping Voltage (VCL) | 28.3 V at 21.5 A (10/1000 µs) - peak voltage seen by protected circuit during surge; limits stress on downstream ICs. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - energy-handling capability for common lightning-induced surges in industrial systems. |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C - negligible standby power loss; critical for battery-powered and low-power sensor nodes. |
| Junction Temperature Range | –55 °C to +175 °C - supports under-hood automotive and high-ambient industrial deployments without derating. |
| Dynamic Resistance (RD) | 9.2 Ω - determines VCL rise vs. current; enables precise overvoltage modeling in system-level simulation. |
Pinout & Package
The SMA6J188A-TR is housed in a JEDEC DO-214AC (SMA) surface-mount package with two terminals: cathode and anode. The package complies with IPC7531 footprint standards and supports reflow soldering per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Low-side reference terminal | Connected to ground or lowest potential node; defines unidirectional conduction path from cathode to anode. |
| Cathode (K) | High-side surge input terminal | Connected to protected line (e.g., 12 V rail); conducts transient current to ground when voltage exceeds VRM. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV air/contact discharge - exceeds Level 4, eliminating need for external ESD staging in USB/UART interfaces. |
| Low junction capacitance | ~100 pF at 1 V (typ.) - preserves signal integrity on 10–100 MHz data lines without bandwidth degradation. |
| Matte tin-plated leads | JESD 22-B102 E3 compliant - ensures solderability and long-term intermetallic stability in automated assembly. |
| UL94 V0 resin housing | Flame-retardant epoxy - satisfies safety requirements for enclosed industrial enclosures and EV charging units. |
| Thermal impedance (Zth j-a) | ~100 °C/W (single pulse, FR4 PCB) - enables sustained operation at 175 °C junction temperature with minimal copper area. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤28.3 V during 10/1000 µs surges, preventing latch-up in 3.3 V/5 V logic and gate drivers. |
Use Scenario: LIN bus line and 12 V supply rail in door module electronics subject to ESD and battery reversal. IC Role / Device Role / Timing Role: Unidirectional TVS on power and data lines to suppress coupling from adjacent high-current actuators. Use Value: Withstands 30 kV contact discharge and maintains <0.2 µA leakage at 85 °C ambient, ensuring sleep-mode current budget compliance. |
| Telecom Remote PHY Node | Smart Energy Meter Interface |
|
Use Scenario: DC power feed (48 V) and Ethernet PHY interface in outdoor distributed cable access equipment. IC Role / Device Role / Timing Role: First-line defense against induced surges from nearby lightning strikes on coaxial or twisted-pair cabling. Use Value: 600 W (10/1000 µs) rating handles typical telecom surge waveforms while maintaining low clamping to protect PoE controllers. |
Use Scenario: RS-485 communication port and AC/DC auxiliary supply in utility-grade electricity meters installed in substations. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (used in back-to-back configuration) on meter's isolated serial interface. Use Value: UL94 V0 housing and 175 °C Tj rating ensure compliance with IEC 62052-11 fire safety and extended lifetime under high-temperature enclosure conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A-TR | Identical electrical specs; same VRM (18 V), VBR (20.0–22.1 V), VCL (28.3 V), and RD (9.2 Ω). | No functional difference - SMA6J188A-TR is a documented marking variant of SMA6J18A-TR per ST's Table 6. | Select based on inventory availability; both share identical qualification, footprint, and reliability data. |
| SMBJ18A | Same VRM and VCL, but higher PPP (600 W vs. 600 W), larger SMB package (DO-214AA), 20% higher thermal resistance (Zth j-a ≈ 120 °C/W). | Less suitable for space-constrained layouts; requires larger PCB pad area and reduced power density at high ambient temperatures. | Choose only if existing design uses SMB footprint or requires higher mechanical robustness; otherwise SMA offers superior board-area efficiency. |
Compared with SMA6J18A-TR (identical function) and SMBJ18A (larger package), SMA6J188A-TR delivers identical protection performance in the smallest standardized surface-mount form factor, enabling higher component density and lower thermal impedance on compact industrial PCBs.
Availability
SMA6J188A-TR is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom remote PHY nodes, and smart energy meter interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMA6J188A-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 power management, analog, MEMS, and microcontroller technologies 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 in harsh environments where low leakage and precise clamping are mandatory.
FAQ
Is SMA6J188A-TR electrically identical to SMA6J18A-TR?
Yes. Per STMicroelectronics' official ordering table (DS5142 Rev 11, Table 6), SMA6J188A-TR is a marked variant of SMA6J18A-TR with identical electrical specifications, thermal ratings, and mechanical packaging. Both share the same VBR (20.0–22.1 V), VCL (28.3 V), and RD (9.2 Ω) values.
What is the maximum surge current this device can handle?
At 10/1000 µs waveform, SMA6J188A-TR supports up to 21.5 A peak pulse current (IPP) while clamping to 28.3 V. For 8/20 µs surges, it handles 102 A with a clamping voltage of 39.3 V - verified per IEC 61000-4-5 test conditions in the datasheet.
Does this TVS diode require derating above 75 °C ambient?
No explicit derating is required up to 175 °C junction temperature. However, leakage current rises from 0.2 µA at 25 °C to 1 µA at 85 °C (per datasheet Table 2), which must be accounted for in ultra-low-power designs. Thermal design should maintain Tj ≤ 175 °C using recommended PCB copper area.
Can SMA6J188A-TR be used in bidirectional signal lines?
No - it is unidirectional only. For bidirectional protection (e.g., USB, RS-485), use SMA6J18CA-TR or pair two SMA6J188A-TR devices in series opposition. The unidirectional structure conducts only from cathode to anode, making it unsuitable for AC-coupled or symmetric signal paths without modification.
SMA6J188A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 323V
- Current - Peak Pulse (10/1000µs):
- 10.3A (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)
SMA6J188A-TR FAQ
1.How can I place an order for SMA6J188A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J188A-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 SMA6J188A-TR reliable?
The price and inventory of SMA6J188A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J188A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J188A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J188A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J188A-TR?
SMA6J188A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J188A-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 SMA6J188A-TR?
For technical support, including SMA6J188A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J188A-TR requirements.
6.How does Aetrix verify that SMA6J188A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J188A-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 SMA6J188A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J188A-TR?
All SMA6J188A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J188A-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 SMA6J188A-TR part is unused and in its original packaging.
Return procedure for SMA6J188A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J188A-TR Tags
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