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STMicroelectronics SMCJ188A-TR
- Part No.:
- SMCJ188A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ188A-TR.pdf
- Description:
- TVS DIODE 188VWM 388VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,925
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Product details
Overview
SMCJ188A-TR from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode with a standoff voltage of 188 V, clamping voltage of 328 V at 4.6 A (10/1000 µs), and low leakage current of 0.2 µA at 25 °C. It is designed for primary-level surge protection in industrial power supplies, telecom DC feeds, and motor drive I/O interfaces where high junction temperature operation up to 150 °C and robust ESD immunity are required.
For engineers reviewing the SMCJ188A-TR datasheet, SMCJ188A-TR pinout, SMCJ188A-TR application, or SMCJ188A-TR equivalent, key selection criteria include its 188 V VRWM rating, 328 V VCL max at 4.6 A, 1500 W peak pulse power (10/1000 µs), 10.8 × 10⁻⁴/°C temperature coefficient, and SMC package thermal performance under sustained surge stress.
Technical Context
This unidirectional TVS diode operates as a clamping device in parallel with protected circuitry, activating when reverse voltage exceeds 188 V (VRWM) and entering avalanche breakdown at minimum 209 V (VBR). Its dynamic resistance of 21.1 Ω enables predictable clamping behavior across surge currents from 1 A to 4.6 A under 10/1000 µs waveform conditions.
The device leverages planar silicon technology to achieve low leakage (0.2 µA at 25 °C) and stable performance up to 150 °C junction temperature, with thermal impedance of ~100 °C/W on standard FR4 PCB footprints - critical for reliability in high-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 188 V - maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR min) | 209 V at 1 mA - guaranteed avalanche initiation threshold under DC test condition |
| Clamping Voltage (VCL) | 328 V at 4.6 A (10/1000 µs) - peak voltage seen by protected circuit during rated surge |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - maximum single-surge energy handling capability at 25 °C ambient |
| Leakage Current (IRM) | 0.2 µA at VRWM and 25 °C - minimal parasitic loading on high-impedance signal or bias lines |
| Junction Temperature Range | –55 °C to +150 °C - supports operation in enclosed industrial enclosures without derating |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2 Level 4) - exceeds automotive and industrial ESD immunity requirements |
Pinout & Package
SMCJ188A-TR is housed in an industry-standard SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked end) and Anode. The package measures 5.55–6.25 mm in length (L), 7.75–8.15 mm in width (E), and 1.90–2.45 mm in height (A1), with matte tin-plated leads compliant with J-STD-002 and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | 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 reference plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| High-power surge clamping | 1500 W (10/1000 µs) enables protection of 48 V–110 V DC bus lines against lightning-induced surges |
| Low-temperature-coefficient breakdown | αT = 10.8 × 10⁻⁴/°C ensures <±5% VBR shift from –40 °C to +125 °C - critical for outdoor equipment |
| Ultra-low leakage current | 0.2 µA at 25 °C minimizes standby power loss and avoids false triggering in high-impedance sensor interfaces |
| High-temperature reliability | Rated for continuous operation at TJ = 150 °C - supports placement near heat-generating components like MOSFETs or transformers |
| Industry-standard footprint | JEDEC-registered SMC outline enables drop-in replacement and compatibility with IPC-7531-compliant PCB layouts |
Applications
| Industrial Motor Drives | Telecom DC Power Feeds |
|---|---|
|
Use Scenario: Protection of gate driver inputs and encoder feedback lines against switching transients in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional clamping element placed across isolated signal lines to limit induced voltages below 350 V. Use Value: Prevents latch-up or permanent damage to optocouplers and isolated ADCs during 1 kV/µs common-mode noise events. |
Use Scenario: Primary-side surge suppression on -48 V telecom rectifier outputs feeding remote radio units. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between DC output and chassis ground to clamp 10/1000 µs lightning surges. Use Value: Limits transient voltage to ≤328 V during 4.6 A surge, preserving downstream DC-DC converters rated for 36 V input max. |
| Programmable Logic Controllers | Renewable Energy Inverters |
|
Use Scenario: Input protection for 24 V digital I/O modules exposed to field wiring in factory automation systems. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS on each channel to suppress ESD and inductive kickback from solenoid loads. Use Value: Withstands repeated ±30 kV ESD strikes while maintaining <0.2 µA leakage - avoids signal drift in precision analog inputs. |
Use Scenario: DC-link overvoltage protection in solar string inverters subjected to grid-switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS on 600–1000 V DC bus to clamp fast-rising surges before IGBT gate drivers are compromised. Use Value: Delivers 1500 W clamping at 150 °C ambient - sustains protection integrity during extended high-temperature operation in rooftop enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188A-TR | Same VRWM (188 V) but lower PPP (600 W), smaller SMB package (lower thermal mass) | Limited to lower-energy surges; unsuitable for 1500 W IEC 61000-4-4 level 4 testing | Select only if board space is constrained and surge threat is limited to ESD-only environments |
| 1.5KE188A | Through-hole DO-201 package, same 188 V VRWM, but higher VCL (344 V) and 1500 W rating | Requires through-hole assembly; less suitable for automated SMT production and high-density layouts | Choose when legacy through-hole design or higher mechanical robustness is prioritized over PCB real estate |
Compared with SMBJ188A-TR and 1.5KE188A, SMCJ188A-TR uniquely balances 1500 W surge capacity, SMT compatibility, and thermal stability up to 150 °C - making it optimal for modern industrial power electronics where both space and reliability are critical.
Availability
SMCJ188A-TR is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC power feeds, programmable logic controllers, and renewable energy inverters requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ188A-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.
SMCJ series TVS diodes belong to ST's high-reliability transient protection product line, engineered specifically for harsh-environment industrial systems demanding robust ESD immunity, high-temperature operation, and precise clamping performance.
FAQ
What is the maximum clamping voltage of SMCJ188A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 328 V at 4.6 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to its positive temperature coefficient (αT = 10.8 × 10⁻⁴/°C), reaching approximately 345 V at 125 °C junction temperature.
Can SMCJ188A-TR be used in bidirectional protection circuits?
No - SMCJ188A-TR is a unidirectional TVS diode, intended for DC-biased lines where reverse polarity is not expected. For bidirectional protection, ST offers the SMCJ188CA variant, which provides symmetrical clamping for AC-coupled or floating signal paths.
What is the recommended PCB footprint for SMCJ188A-TR?
The recommended footprint follows IPC-7531 and JEDEC DO-214AB standards: pad length 5.11 mm, pad width 3.14 mm, center-to-center spacing 8.19 mm, with 1.54 mm solder mask clearance. Thermal relief via copper area under each lead improves power dissipation - Rth(j-a) drops from ~120 °C/W (no copper) to ~60 °C/W with 2 cm² per pad.
How does leakage current change with temperature?
Leakage current rises exponentially with junction temperature: at 25 °C it is 0.2 µA, increasing to ~100 nA at 85 °C and ~10 µA at 125 °C (per Figure 9 in DS1284). This remains well within acceptable limits for most industrial control applications but must be verified in ultra-low-power sensor front-ends.
SMCJ188A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 388V
- Current - Peak Pulse (10/1000µs):
- 26A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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:
- SMC
SMCJ188A-TR FAQ
1.How can I place an order for SMCJ188A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ188A-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 SMCJ188A-TR reliable?
The price and inventory of SMCJ188A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ188A-TR is usually 5 days.
3.What payment methods are accepted for SMCJ188A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ188A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ188A-TR?
SMCJ188A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ188A-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 SMCJ188A-TR?
For technical support, including SMCJ188A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ188A-TR requirements.
6.How does Aetrix verify that SMCJ188A-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ188A-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 SMCJ188A-TR meets industry standards.
7.What is the process for return or replacement of SMCJ188A-TR?
All SMCJ188A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ188A-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 SMCJ188A-TR part is unused and in its original packaging.
Return procedure for SMCJ188A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ188A-TR Tags
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