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Vishay General Semiconductor - Diodes Division SMBJ170A-E3/52
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- Part No.:
- SMBJ170A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170A-E3/52.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:517
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Product details
Overview
SMBJ170A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and lightning-induced surges on power rails and signal lines. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, 275 V maximum clamping voltage (VC) at 2.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMBJ170A-E3/52 datasheet, SMBJ170A-E3/52 pinout, SMBJ170A-E3/52 application, or SMBJ170A-E3/52 equivalent, key selection criteria include clamping voltage margin relative to system rail, surge current handling under real-world 10/1000 µs transients, thermal resistance (RθJA = 100 °C/W), RoHS-compliant commercial-grade qualification, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This unidirectional TVS operates as a voltage-clamping protection device: when reverse-biased voltage exceeds VBR, it avalanches into low-impedance conduction to divert surge energy away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
The device is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports operation from –55 °C to +150 °C junction temperature, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Polarity is marked by a cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's nominal rail. |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - guaranteed avalanche onset range; determines minimum overvoltage threshold for reliable triggering. |
| VC @ IPPM | 275 V at 2.2 A - maximum clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream components. |
| PPPM | 600 W - peak pulse power handling capability; validates robustness against standardized lightning/surge waveforms. |
| IFSM | 100 A - single half-sine surge current rating (8.3 ms); confirms resilience to high-energy inductive turn-off events. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance; informs derating requirements for sustained power dissipation. |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; optimized for automated assembly. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (reverse-biased during clamping) | Connected to lower-potential side of protected line; forms avalanche path when VAK > VBR. |
| Cathode | Forward current exit (reverse-biased during clamping) | Connected to higher-potential side (e.g., VIN rail); band-marked terminal; defines unidirectional blocking direction. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 Level 4 surge immunity testing for industrial equipment. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during clamping, reducing stress on 200 V-rated MOSFETs or gate drivers. |
| 100 °C/W thermal resistance | Enables thermal design with minimal copper area (0.2" × 0.2" pads) while maintaining safe TJ < 150 °C under surge duty. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets global environmental regulations without halogen restrictions; suitable for consumer and industrial production. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without moisture sensitivity concerns or baking requirements. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of DC bus inputs against back-EMF spikes from contactor switching and regenerative braking. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input terminals to clamp transients before they reach bulk capacitors and controller ICs. Use Value: Limits voltage excursions to ≤275 V during 2.2 A surges, preserving 300 V-rated electrolytic capacitors and gate drivers. |
Use Scenario: Input-stage surge suppression on AC/DC front-ends exposed to lightning-induced surges on building mains. IC Role / Device Role / Timing Role: Primary clamping device on rectified DC output, coordinated with MOVs and fuses in Class II power systems. Use Value: Delivers 600 W pulse handling with fast response (<1 ns), ensuring upstream rectifiers and PFC controllers remain within SOA. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
Use Scenario: Protection of 12 V/24 V supply rails in BCMs against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary-level TVS on microcontroller power domains, supplementing primary TVS and LDOs. Use Value: Withstands 100 A IFSM pulses and maintains <1 µA leakage at 170 V, preventing false resets in low-power sleep modes. |
Use Scenario: Transient suppression on analog sensor outputs (e.g., pressure, temperature) routed through long harnesses. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on differential or single-ended signal lines feeding ADC inputs. Use Value: Clamps ESD and inductive kickback to <275 V while adding negligible capacitance (<100 pF), preserving signal integrity up to 1 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA-E3/52 | Bidirectional variant; symmetric VBR (189–209 V) in both polarities; no cathode marking. | Required where AC-coupled or floating signal lines need protection against ± transients (e.g., RS-485, CAN bus). | Select only if bidirectional clamping is required; not a drop-in replacement due to polarity and marking differences. |
| SMCJ170A-E3/52 | Larger SMC (DO-214AB) package; same VWM/VBR/VC but higher PPPM = 1500 W and lower RθJA = 40 °C/W. | Used where higher surge energy (e.g., outdoor telecom cabinets) demands greater power handling and thermal margin. | Requires PCB layout change; offers superior robustness but larger footprint and higher cost per unit. |
Compared with SMBJ170CA-E3/52, the SMBJ170A-E3/52 provides directional clamping essential for DC rails, while versus SMCJ170A-E3/52, it trades peak power capacity for compact SMB footprint-making it optimal for space-constrained industrial control boards needing 600 W surge protection.
Availability
SMBJ170A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply and RoHS-compliant commercial-grade assurance.
Supply support for SMBJ170A-E3/52 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series was engineered for high-reliability transient suppression in harsh environments-targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping behavior and AEC-Q101 readiness matter.
FAQ
What is the maximum clamping voltage of SMBJ170A-E3/52 under surge conditions?
The SMBJ170A-E3/52 has a maximum clamping voltage (VC) of 275 V at 2.2 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SMBJ170A-E3/52 achieves this clamping performance while maintaining low incremental surge resistance and fast response time.
Is SMBJ170A-E3/52 suitable for automotive applications?
The SMBJ170A-E3/52 is a commercial-grade RoHS-compliant part (E3 suffix) and not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ170AHE3 variant (HE3 suffix), which adds AEC-Q101 qualification. The SMBJ170A-E3/52 itself is rated for –55 °C to +150 °C operating temperature and handles 100 A IFSM, but lacks automotive-specific validation and traceability documentation required for Tier 1 supply chains.
How does SMBJ170A-E3/52 differ from SMBJ170CA-E3/52?
The SMBJ170A-E3/52 is unidirectional with cathode band marking and blocks forward current; the SMBJ170CA-E3/52 is bidirectional with identical VBR in both directions and no polarity marking. Their electrical parameters (VWM, VBR, VC, PPPM) are matched, but they are not interchangeable without circuit review. The SMBJ170A-E3/52 is used on DC rails; SMBJ170CA-E3/52 suits AC or floating nodes like data lines.
What is the thermal resistance of SMBJ170A-E3/52, and how does it affect layout?
The SMBJ170A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard SMB pad layout per Vishay's recommended footprint. To maintain TJ ≤ 150 °C during repetitive surges, designers must ensure adequate copper area and avoid excessive ambient temperature rise - the SMBJ170A-E3/52 relies on PCB copper for heat dissipation.
Can SMBJ170A-E3/52 be used in place of a 180 V-rated TVS?
No - the SMBJ170A-E3/52 is specifically rated for 170 V stand-off voltage (VWM) and 189–209 V breakdown range. Using it in a system designed for 180 V VWM risks premature clamping or insufficient margin above nominal rail. For 180 V applications, SMBJ180A variants exist; substituting SMBJ170A-E3/52 would require verifying that 170 V VWM provides adequate headroom and that 275 V clamping remains within downstream component ratings.
SMBJ170A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- DO-214AA (SMBJ)
SMBJ170A-E3/52 FAQ
1.How can I place an order for SMBJ170A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170A-E3/52 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 SMBJ170A-E3/52 reliable?
The price and inventory of SMBJ170A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ170A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170A-E3/52?
SMBJ170A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170A-E3/52 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 SMBJ170A-E3/52?
For technical support, including SMBJ170A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170A-E3/52 requirements.
6.How does Aetrix verify that SMBJ170A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ170A-E3/52 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 SMBJ170A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ170A-E3/52?
All SMBJ170A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170A-E3/52, 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 SMBJ170A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ170A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170A-E3/52 Tags
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