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STMicroelectronics SMBJ170CA-TR
- Part No.:
- SMBJ170CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CA-TR.pdf
- Description:
- TVS DIODE 170VWM 275VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,435
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Product details
Overview
SMBJ170CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed to protect sensitive electronics against ESD (IEC 61000-4-2 ±30 kV air/contact), EFT (IEC 61000-4-4 level 4, 4 kV), and surge transients. It features a standoff voltage of 170 V, clamping voltage of 275 V at 2.2 A (10/1000 µs), peak pulse power of 600 W, and low leakage current ≤0.2 µA at 25 °C - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ170CA-TR datasheet, SMBJ170CA-TR pinout, SMBJ170CA-TR application, or SMBJ170CA-TR equivalent, key selection criteria include bidirectional clamping behavior, 275 V max clamping at 2.2 A, 170 V reverse standoff rating, thermal derating above 25 °C, and UL497B recognition for isolated loop protection.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, with breakdown voltage (VBR) min 189 V and typ 199 V at 1 mA, enabling robust overvoltage protection without polarity dependency. Its dynamic resistance (RD) is 12.7 Ω at 8/20 µs, ensuring predictable voltage limiting under fast transients.
The device sustains 150 °C maximum junction temperature and delivers up to 350 W peak pulse power at Tj = 150 °C (10/1000 µs), validated per JEDEC JESD22-A108. It meets IEC 61000-4-2 level 4 (±30 kV), IEC 61000-4-4 level 4 (4 kV), and UL497B (file E136224) for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 170 V - maximum continuous reverse operating voltage before conduction begins |
| Breakdown Voltage (VBR) | 189–199 V at 1 mA - precise threshold where avalanche conduction initiates reliably |
| Clamping Voltage (VCL) | 275 V at 2.2 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - transient energy handling capacity at Tj = 25 °C |
| Leakage Current (IR) | ≤0.2 µA at 25 °C, ≤1 µA at 85 °C - minimal DC loading on high-impedance signal paths |
| Junction Temperature Range | −55 to +150 °C - supports operation in harsh industrial and outdoor environments |
| UL Recognition | UL497B (E136224) - certified for use as isolated loop circuit protector in safety-critical systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal bidirectional configuration. Dimensions: 3.30–3.95 mm length × 5.10–5.60 mm width × 2.45 mm height (JEDEC MO-136AC). Matte tin-plated leads compliant with J-STD-002, JESD22-B102 E3, and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking required; identical clamping behavior in both directions |
| Cathode Band (not present) | Non-polarized terminal identification | Marking absent - device functions identically regardless of orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| Low dynamic resistance (12.7 Ω) | Minimizes voltage overshoot during 8/20 µs surges, improving protection margin for downstream ICs |
| UL497B recognition (E136224) | Validates suitability for isolated loop protection in industrial control and process automation systems |
| High-temperature capability (Tj = 150 °C) | Supports reliable operation in enclosed enclosures or near heat-generating components |
| ESD immunity (±30 kV contact/air) | Exceeds IEC 61000-4-2 level 4, eliminating need for additional ESD staging on board-level interfaces |
Applications
| Industrial Motor Drives | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of RS-485 transceivers and encoder feedback lines against lightning-induced surges and inductive switching transients. IC Role / Device Role: Bidirectional voltage clamp placed across differential bus lines (A/B) and ground. Use Value: Limits transient voltage to ≤275 V during 2.2 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V transceivers. |
Use Scenario: Surge suppression on POTS line interface circuits exposed to induced transients from nearby AC mains or lightning. IC Role / Device Role: Primary protection element between tip/ring and codec or SLIC front-end. Use Value: Withstands 4 kV EFT (IEC 61000-4-4) and clamps to 275 V, preserving analog signal integrity and avoiding codec reset events. |
| Power Supply Input Stage | Automotive Body Control Module |
|
Use Scenario: Secondary overvoltage protection on 24 V DC input rails after primary fuse and MOV stages. IC Role / Device Role: Fast-response clamp absorbing residual transients that bypass upstream protection. Use Value: Low leakage (≤0.2 µA) avoids unnecessary standby current draw; 150 °C rating ensures reliability in sealed power enclosures. |
Use Scenario: ESD protection on LIN bus lines and sensor inputs (e.g., ambient temperature, door switch) in BCM assemblies. IC Role / Device Role: Board-level ESD suppressor mounted adjacent to connector pins. Use Value: ±30 kV contact discharge rating exceeds ISO 10605 requirements; SMB footprint enables compact layout near connectors. |
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 from Vishay (SMCJ170CA) | Same 170 V VRM, but higher clamping voltage (290 V @ 2.2 A) and lower peak power (1500 W vs 600 W 10/1000 µs) | Less effective clamping margin for 3.3 V/5 V ICs; better suited for 24–48 V systems with higher tolerance | Select when higher surge energy handling (1500 W) is prioritized over tight clamping voltage |
| P6SMB170CA from ON Semiconductor | Identical VRM (170 V), but higher leakage (1 µA @ 25 °C) and no UL497B recognition | Lacks UL certification for isolated loop use; requires additional system-level validation for safety-critical deployments | Choose only for cost-sensitive non-safety applications where UL compliance is not mandated |
Compared with SMBJ170CA-TR, the Vishay SMCJ170CA offers greater surge energy headroom but sacrifices clamping precision, while the ON Semi P6SMB170CA omits UL497B listing and exhibits higher leakage - making the ST part optimal for safety-certified industrial and telecom designs requiring tight voltage control and regulatory traceability.
Availability
SMBJ170CA-TR is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, power supply input stages, and automotive body control modules requiring stable component supply, long-term lifecycle support, and UL-recognized surge protection.
Supply support for SMBJ170CA-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.
The SMBJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability ESD and surge suppression in industrial automation, telecom infrastructure, and power conversion systems where low leakage, high-temperature stability, and safety certification are mandatory.
FAQ
What is the difference between SMBJ170CA-TR and SMBJ170A-TR?
SMBJ170CA-TR is bidirectional, providing symmetrical clamping for AC or floating signals, while SMBJ170A-TR is unidirectional and requires correct anode/cathode orientation. The "CA" suffix denotes bidirectional functionality, confirmed by identical VBR and VCL values in both polarities per DS1283 Table 2. This makes SMBJ170CA-TR ideal for RS-485, CAN, or LIN bus protection where polarity is undefined.
Does SMBJ170CA-TR meet IEC 61000-4-5 surge immunity requirements?
No - SMBJ170CA-TR is rated for IEC 61000-4-4 (EFT, 4 kV) and IEC 61000-4-2 (ESD, ±30 kV), but not IEC 61000-4-5 (lightning surge, 1–2 kV line-to-line). Its 600 W (10/1000 µs) rating corresponds to lower-energy transients; for full IEC 61000-4-5 compliance, a higher-power TVS (e.g., 1500 W SMCJ or 5 kA MOV) must be used upstream.
Can SMBJ170CA-TR be used in parallel for higher surge current handling?
Not recommended without current-sharing design measures. Due to parameter spread (VBR tolerance ±5%), paralleling devices causes uneven current distribution - one diode may absorb >80% of surge current, risking thermal runaway. For higher current, select a single higher-rated device (e.g., SMCJ170CA) or implement active current-balancing networks.
Is the SMBJ170CA-TR RoHS-compliant and halogen-free?
Yes - it carries ST's ECOPACK2 designation, meeting RoHS Directive 2011/65/EU and halogen-free requirements (≤900 ppm bromine, ≤900 ppm chlorine, total ≤1500 ppm halogens). This is verified in DS1283 Section 2 ("Package information") and supported by ST's public ECOPACK database and material declarations.
SMBJ170CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, 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:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SMBJ170CA-TR FAQ
1.How can I place an order for SMBJ170CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CA-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 SMBJ170CA-TR reliable?
The price and inventory of SMBJ170CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ170CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CA-TR?
SMBJ170CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CA-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 SMBJ170CA-TR?
For technical support, including SMBJ170CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CA-TR requirements.
6.How does Aetrix verify that SMBJ170CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ170CA-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 SMBJ170CA-TR meets industry standards.
7.What is the process for return or replacement of SMBJ170CA-TR?
All SMBJ170CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CA-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 SMBJ170CA-TR part is unused and in its original packaging.
Return procedure for SMBJ170CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170CA-TR Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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