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STMicroelectronics SMAJ188CA-TR
- Part No.:
- SMAJ188CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CA-TR.pdf
- Description:
- TVS DIODE 188VWM 388VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,606
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Product details
Overview
SMAJ188CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-voltage surge protection in industrial and telecom power rails. It features a 188 V standoff voltage (VRM), 328 V clamping voltage at 1.4 A (10/1000 µs), 400 W peak pulse power rating, and operates up to +150 °C junction temperature-ideal for protecting 170–200 V DC bus lines against IEC 61000-4-4 level 4 (4 kV) surges.
For engineers reviewing the SMAJ188CA-TR datasheet, SMAJ188CA-TR pinout, SMAJ188CA-TR application, or SMAJ188CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and verified IEC 61000-4-2 ESD immunity (30 kV air/contact discharge).
Technical Context
This TVS diode uses planar silicon junction technology to achieve stable breakdown characteristics and low dynamic resistance (26.2 Ω at 8/20 µs), enabling consistent clamping under repetitive surge stress. Its bidirectional architecture provides symmetrical protection for AC-coupled or floating signal/power lines without polarity dependency.
The device complies with IEC 61000-4-4 (4 kV), IEC 61000-4-2 (30 kV), and MIL-STD-883 method 3015, supporting robust front-end protection in telecom rectifiers, PoE injectors, and industrial PLC I/O modules where long-term reliability at elevated junction temperatures is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 188 V - Maximum continuous reverse operating voltage before conduction begins. |
| Clamping Voltage (VCL) | 328 V @ 1.4 A (10/1000 µs) - Peak voltage seen by protected circuit during surge event. |
| Peak Pulse Power | 400 W (10/1000 µs) - Sustains short-duration transients without degradation in standard PCB layout. |
| Leakage Current | 0.2 µA @ 25 °C - Minimal loading on high-impedance 188 V bias networks. |
| Junction Temp Range | −55 to +150 °C - Enables deployment in uncooled outdoor enclosures or high-ambient industrial environments. |
| ESD Rating | 30 kV contact & air discharge (IEC 61000-4-2) - Exceeds level 4 for direct human interaction points. |
| Surge Standard Compliance | IEC 61000-4-4 level 4 (4 kV) - Validated for fast-rising ring wave and burst immunity in power supply inputs. |
Pinout & Package
Package: DO-214AC (SMA), JEDEC registered, IPC-7531 compliant footprint, matte tin-plated leads, MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Common terminal for bidirectional clamping | Internally connected to both P-N junctions; serves as reference node for symmetrical voltage limiting. |
| Anode | Common terminal for bidirectional clamping | Electrically identical to cathode in CA configuration; forms center-tapped structure enabling ±188 V clamping threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating DC rails without external polarity management. |
| Low dynamic resistance | 26.2 Ω (8/20 µs) ensures minimal overshoot during high-current transients like lightning-induced surges. |
| High-temperature operation | Rated to +150 °C junction enables use in thermally constrained locations near power converters or heatsinks. |
| Low leakage current | 0.2 µA @ 25 °C preserves accuracy in high-impedance voltage monitoring circuits upstream of protection stage. |
| JEDEC DO-214AC footprint | Ensures drop-in replacement compatibility with existing SMA layouts and automated assembly processes. |
Applications
| Telecom Rectifier Output Protection | PoE++ Injector DC Bus Clamp |
|---|---|
Use Scenario: Protecting 170–200 V DC output of telecom rectifiers from load dump and induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across output terminals to clamp overvoltage events within 1 ns response time. Use Value: Prevents damage to downstream DC-DC converters and line cards during 4 kV IEC 61000-4-4 bursts while maintaining <0.2 µA standby leakage. | Use Scenario: Clamping transient spikes on 57 V PoE++ (IEEE 802.3bt Type 4) injector outputs during cable hot-plug or fault recovery. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing energy from inductive kickback and ESD events on powered Ethernet pairs. Use Value: Maintains compliance with UL60950-1 insulation requirements and prevents latch-up in IEEE 802.3bt PD interface ICs. |
| Industrial PLC Analog Input Protection | EV Charging Station DC Link Monitor |
Use Scenario: Guarding high-impedance ±10 V analog input channels in programmable logic controllers against field-wiring ESD and ground bounce. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at connector entry point before precision op-amp front-end. Use Value: Limits input voltage to ±328 V during 30 kV contact discharge, preserving 16-bit ADC accuracy and eliminating need for series resistors. | Use Scenario: Protecting voltage sense nodes on 400–800 V DC link of EV charging stations from switching transients and grid coupling noise. IC Role / Device Role / Timing Role: High-voltage TVS mounted directly at shunt resistor measurement points to suppress common-mode spikes. Use Value: Ensures stable feedback to SiC gate drivers during 4 kV surge events, preventing false overvoltage trips and system shutdowns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188CA-TR | Same VRM/VCL specs but SMB (DO-214AA) package; 600 W (10/1000 µs) rating | Higher power handling requires larger PCB area; less suitable for space-constrained telecom modules | Select when surge energy exceeds 400 W and board layout allows SMB footprint. |
| SMCJ188CA-TR | Same VRM/VCL but SMC (DO-214AB) package; 1500 W (10/1000 µs) rating | Designed for primary-side AC input protection; over-specified for secondary-side 188 V DC rails | Choose only if system-level testing confirms >1 kW surge exposure and thermal derating is validated. |
Compared with SMBJ188CA-TR and SMCJ188CA-TR, SMAJ188CA-TR offers optimal balance of 400 W surge capability, compact DO-214AC footprint, and low leakage-making it preferred for secondary-side 170–200 V DC protection where board space and standby power are critical.
Availability
SMAJ188CA-TR is available at Aetrix Electronics and suitable for telecom rectifier outputs, PoE++ injector DC buses, industrial PLC analog inputs, and EV charging station DC link monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ188CA-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 SMAJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, low-leakage surge suppression in space- and thermal-constrained applications operating up to +150 °C junction temperature.
FAQ
What is the difference between SMAJ188A-TR and SMAJ188CA-TR?
SMAJ188A-TR is unidirectional (anode-cathode polarity), intended for DC rail protection with defined ground reference. SMAJ188CA-TR is bidirectional, with symmetrical clamping in both directions-essential for AC-coupled signals, floating supplies, or differential bus protection where polarity is undefined or reversible.
Does SMAJ188CA-TR meet IEC 61000-4-5 requirements?
No-SMAJ188CA-TR is rated for IEC 61000-4-4 (electrical fast transient/burst) and IEC 61000-4-2 (ESD), not IEC 61000-4-5 (surge). Its 400 W (10/1000 µs) rating aligns with level 4 of IEC 61000-4-4 (4 kV), but full IEC 61000-4-5 compliance requires higher-energy devices like 1.5KE or 5.0SMD series.
Can SMAJ188CA-TR be used in parallel for higher surge current handling?
Not recommended without current-sharing resistors or matched VBR tolerances. The SMAJ188CA-TR has ±5% VBR tolerance (209–220 V); mismatched units may cause uneven current division and premature failure. For >1.4 A surge currents, select a higher-power variant like SMBJ188CA-TR instead.
Is the SMAJ188CA-TR RoHS and REACH compliant?
Yes-SMAJ188CA-TR carries STMicroelectronics' ECOPACK2 qualification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, including SVHC screening. Lead finish is matte tin, and packaging complies with J-STD-020 MSL Level 1 for unlimited floor life.
SMAJ188CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 388V
- Current - Peak Pulse (10/1000µs):
- 6A (8/20µs)
- Power - Peak Pulse:
- 400W
- 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:
- DO-214AC (SMA)
SMAJ188CA-TR FAQ
1.How can I place an order for SMAJ188CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CA-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 SMAJ188CA-TR reliable?
The price and inventory of SMAJ188CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ188CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CA-TR?
SMAJ188CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CA-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 SMAJ188CA-TR?
For technical support, including SMAJ188CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CA-TR requirements.
6.How does Aetrix verify that SMAJ188CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ188CA-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 SMAJ188CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ188CA-TR?
All SMAJ188CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CA-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 SMAJ188CA-TR part is unused and in its original packaging.
Return procedure for SMAJ188CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188CA-TR Tags
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