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STMicroelectronics SMAJ170CA-TR
- Part No.:
- SMAJ170CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ170CA-TR.pdf
- Description:
- TVS DIODE 170VWM 353VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:14,640
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Product details
Overview
SMAJ170CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 170 V standoff voltage (VRM), 275 V maximum clamping voltage at 1.4 A (8/20 µs), 400 W peak pulse power (10/1000 µs), and operates up to +150 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the SMAJ170CA-TR datasheet, SMAJ170CA-TR pinout, SMAJ170CA-TR application, or SMAJ170CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, IEC 61000-4-2 level 4 (±30 kV contact/air) compliance, and thermal stability across automotive-grade ambient ranges.
Technical Context
This TVS diode uses planar silicon junction technology to achieve low leakage current and stable breakdown characteristics over temperature. Its bidirectional configuration enables symmetrical clamping on AC-coupled or floating lines without polarity constraints.
The device meets IEC 61000-4-4 level 4 (4 kV) surge immunity and exceeds IEC 61000-4-2 level 4 ESD robustness (±30 kV). Dynamic resistance is 22.2 Ω at 8/20 µs, ensuring predictable voltage limiting under fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 170 V - Maximum continuous reverse operating voltage before conduction begins. |
| Breakdown Voltage (VBR min) | 189 V at 1 mA - Guaranteed minimum voltage at which avalanche conduction initiates reliably. |
| Clamping Voltage (VCL) | 275 V at 1.4 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge event. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained energy-handling capability for lightning-induced surges. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - Minimal parasitic loading on high-impedance sensor or reference lines. |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in under-hood automotive or industrial motor drive environments. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2 level 4) - Full immunity to human-body-model ESD events. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, JEDEC-registered outline with matte tin-plated leads compliant with J-STD-020 MSL level 1 and IPC-7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge current sink terminal (bidirectional) | Both terminals function identically; no polarity marking required for CA-type devices. |
| Anode (A) | Surge current source terminal (bidirectional) | Terminal symmetry enables placement flexibility on PCB without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential buses (e.g., RS-485, CAN FD). |
| Low dynamic resistance (RD) | 22.2 Ω ensures tight clamping window and minimal overshoot during 8/20 µs surges. |
| High-temperature operation | Rated to +150 °C junction temperature supports use in enclosed power converters with limited airflow. |
| JEDEC-compliant SMA footprint | Ensures mechanical and thermal compatibility with standard reflow profiles and automated assembly. |
| UL94 V-0 flammability rating | Validates polymer encapsulation safety in end-equipment requiring fire-retardant materials. |
Applications
| Industrial Power Input Protection | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: 24–48 V DC input rails in programmable logic controllers (PLCs) exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary surge shunt element placed upstream of DC-DC converters and microcontroller power domains. Use Value: Limits transient voltage to <275 V during 400 W (10/1000 µs) surges, preventing latch-up or permanent damage to downstream regulators. |
Use Scenario: RS-485 transceiver ports in base station remote radio units subjected to lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Bidirectional line protector between bus traces and transceiver I/O pins. Use Value: Clamps ±30 kV ESD events within 1 ns while maintaining <0.2 µA leakage to preserve common-mode range and data integrity. |
| Automotive Body Control Module (BCM) | Smart Meter Communication Port |
|
Use Scenario: LIN bus termination in vehicle door modules where ESD exposure occurs during assembly and field service. IC Role / Device Role / Timing Role: Secondary-level ESD suppressor located adjacent to connector interface, complementing system-level filtering. Use Value: Withstands repeated ±30 kV contact discharges without parameter drift, supporting AEC-Q200-relevant reliability requirements. |
Use Scenario: PLC (power-line communication) coupling circuitry in utility smart meters connected to noisy 230 V AC mains. IC Role / Device Role / Timing Role: Fast-response clamp protecting analog front-end ADC inputs from 4 kV IEC 61000-4-4 surges. Use Value: Delivers 275 V clamping at 1.4 A with 22.2 Ω RD, reducing stress on precision op-amps and isolation amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA-TR | Higher 600 W (10/1000 µs) rating; larger SMB (DO-214AA) package; 290 V VCL at 2.1 A. | Preferred where higher surge margin is required and PCB space allows larger footprint. | Select when system-level surge testing exceeds 400 W but board layout accommodates wider body. |
| SMCJ170CA-TR | 1500 W (10/1000 µs); SMC (DO-214AB) package; 312 V VCL at 4.8 A; higher thermal mass. | Suitable for primary-level protection in AC/DC front-ends or PoE injectors with high-energy threats. | Choose for first-stage protection where coordination with downstream 400 W devices (e.g., SMAJ170CA) is needed. |
Compared with SMBJ170CA-TR and SMCJ170CA-TR, SMAJ170CA-TR offers optimal balance of compact size, 400 W surge handling, and low-leakage performance for secondary-level protection in space-constrained industrial and telecom nodes.
Availability
SMAJ170CA-TR is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface protection, automotive body control modules, and smart meter communication ports requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ170CA-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 intelligent power, sensing, and control solutions for industrial, automotive, and consumer markets.
SMAJxxCA devices belong to ST's TVS Diode portfolio, engineered specifically for high-reliability, low-leakage transient suppression in harsh electromagnetic environments - emphasizing robustness, JEDEC compliance, and seamless integration into automated manufacturing.
FAQ
What is the difference between SMAJ170A-TR and SMAJ170CA-TR?
SMAJ170A-TR is unidirectional and conducts only in reverse bias, requiring correct polarity placement; SMAJ170CA-TR is bidirectional, providing symmetrical clamping for AC signals or floating lines without orientation dependency. Both share identical VRM (170 V), VBR (189–199 V), and PPP (400 W), but CA type eliminates polarity-sensitive routing.
Can SMAJ170CA-TR be used in place of SMAJ150CA-TR?
No - SMAJ170CA-TR has higher standoff (170 V vs. 150 V) and clamping (275 V vs. 246 V), making it unsuitable for 150 V systems where lower VCL is critical to protect downstream ICs. Substitution requires verifying that protected circuit's absolute maximum ratings exceed 275 V and that system surge profile remains within 400 W limits.
Is SMAJ170CA-TR RoHS and REACH compliant?
Yes - SMAJ170CA-TR carries STMicroelectronics' ECOPACK2 designation, confirming full compliance with RoHS Directive 2011/65/EU (Pb-free matte tin plating) and REACH SVHC thresholds. It also meets J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
What is the recommended PCB footprint for SMAJ170CA-TR?
The official ST-recommended footprint matches IPC-7531 for DO-214AC: pad length 2.63 mm (0.104"), pad width 1.40 mm (0.055"), center-to-center spacing 5.43 mm (0.214"), and copper area ≥1.64 cm² per lead to maintain Rth(j-a) ≤ 4.5 °C/W per Figure 12 in DS1251 Rev 15.
SMAJ170CA-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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 353V
- Current - Peak Pulse (10/1000µs):
- 6.5A (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)
SMAJ170CA-TR FAQ
1.How can I place an order for SMAJ170CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ170CA-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 SMAJ170CA-TR reliable?
The price and inventory of SMAJ170CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ170CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ170CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ170CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ170CA-TR?
SMAJ170CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ170CA-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 SMAJ170CA-TR?
For technical support, including SMAJ170CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ170CA-TR requirements.
6.How does Aetrix verify that SMAJ170CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ170CA-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 SMAJ170CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ170CA-TR?
All SMAJ170CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ170CA-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 SMAJ170CA-TR part is unused and in its original packaging.
Return procedure for SMAJ170CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ170CA-TR Tags
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