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Vishay General Semiconductor - Diodes Division SMBJ170CA-M3/5B
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- Part No.:
- SMBJ170CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CA-M3/5B.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,738
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Product details
Overview
SMBJ170CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 170 V stand-off voltage (VWM), 189–209 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), clamping voltage of 275 V at 2.2 A IPPM, and operates across –55 °C to +150 °C junction temperature range - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ170CA-M3/5B datasheet, SMBJ170CA-M3/5B pinout, SMBJ170CA-M3/5B application, or SMBJ170CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ns) to transient surges induced by inductive switching or ESD events. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
The device delivers 600 W peak pulse power handling per 10/1000 μs waveform at TA = 25 °C, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 189 V / 209 V at IT = 1 mA - guaranteed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 275 V at 2.2 A - clamped voltage during 10/1000 μs surge, defining protected circuit's max stress level |
| PPPM | 600 W - peak transient energy absorption capacity under standard lightning/surge waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensures minimal standby power loss and signal integrity in high-impedance nodes |
| TJ max. | +150 °C - extended thermal rating supports operation in enclosed industrial enclosures or near heat sources |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMT outline with 5.59 mm max length, compatible with JEDEC MS-012 |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode during positive transients; accepts surge current from either polarity |
| Cathode | Transient current entry (bidirectional) | Acts as anode during negative transients; completes low-impedance path to ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded interfaces without polarity concerns |
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surge (4 kV line-earth) when properly laid out on 0.2" × 0.2" copper pads |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for industrial and automotive-adjacent applications without compromising reliability |
| Fast response time (<1 ns) | Clamps transients before downstream ICs (e.g., microcontrollers, RS-485 transceivers) experience damaging overvoltage |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without preconditioning or special handling |
Applications
| Industrial Motor Drive Control | RS-485 Communication Line Protection |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback sensors from inductive kickback during MOSFET/IGBT switching in variable-frequency drives. IC Role / Device Role: Bidirectional TVS placed across DC bus or between isolated control signal lines and ground. Use Value: Limits transient voltage to ≤275 V, preventing latch-up or oxide rupture in 3.3 V/5 V logic interfaces tied to high-power stages. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers against ESD and cable-induced surges in factory automation networks. IC Role / Device Role: Connected line-to-line (A–B) and line-to-ground on both bus ends to suppress common-mode and differential transients. Use Value: Maintains signal integrity under ±15 kV contact ESD (IEC 61000-4-2) and sustains 600 W surge immunity without degradation after repeated events. |
| AC-DC Power Supply Input Stage | Automotive Body Control Module (BCM) Signal Inputs |
|
Use Scenario: Clamping induced spikes on rectified AC input rails prior to bulk capacitor and primary-side controller. IC Role / Device Role: Mounted across bridge rectifier output or between DC+ and DC− to absorb switching noise and lightning surges. Use Value: Withstands repetitive 10/1000 μs transients up to 600 W while maintaining VWM = 170 V - ideal for 120/230 VAC-derived 340 VDC rails. |
Use Scenario: Protecting LIN or CAN FD signal inputs in BCMs exposed to load dump and jump-start conditions. IC Role / Device Role: Placed on sensor or switch input lines referenced to chassis ground in non-AEC-Q101 qualified modules. Use Value: Provides cost-effective secondary protection where primary suppression exists, leveraging 2.2 A IPPM and 275 V VC to prevent false triggering or damage. |
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-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable for commercial-grade designs where halogen-free requirement is not mandated | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process |
| SMAJ170CA-M3 | Lower PPPM (400 W), larger VBR tolerance (189–221 V), SMA package (smaller thermal mass) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 without derating | Choose only for space-constrained layouts where 600 W headroom is unnecessary and thermal dissipation is managed externally |
Compared with SMBJ170CA-M3/5B, the E3 variant trades halogen-free status for slightly lower cost in commercial applications, while the SMAJ170CA-M3 sacrifices 33 % peak power handling and thermal robustness for smaller board area - neither offers pin-compatible replacement without layout or system-level validation.
Availability
SMBJ170CA-M3/5B is available at Aetrix Electronics and suitable for industrial motor control, RS-485 infrastructure, and AC-DC power supply designs requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMBJ170CA-M3/5B 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, and protection devices with emphasis on reliability, thermal performance, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, power conversion, and communication systems where failure resilience and long-term stability are critical.
FAQ
What does the "CA" suffix indicate in SMBJ170CA-M3/5B?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ170CA-M3/5B provides symmetrical clamping for both positive and negative transients without polarity dependence. This differs from unidirectional variants (e.g., SMBJ170A-M3/5B), which require correct cathode orientation and only clamp in one direction. The CA version is used where signal lines float or carry AC-coupled data.
Does SMBJ170CA-M3/5B meet AEC-Q101 qualification?
No, SMBJ170CA-M3/5B is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free RoHS compliance for commercial-grade use. For automotive applications requiring AEC-Q101, the equivalent part is SMBJ170CAHM3_B/I - which adds qualification testing and traceability while retaining identical electrical specs and SMB package dimensions.
What is the maximum clamping voltage of SMBJ170CA-M3/5B under surge conditions?
The maximum clamping voltage (VC) of SMBJ170CA-M3/5B is 275 V, measured at its peak pulse current (IPPM) of 2.2 A under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Vishay datasheet Document Number 88392, page 2.
Can SMBJ170CA-M3/5B be used in place of SMBJ170A-M3/5B?
No - SMBJ170CA-M3/5B and SMBJ170A-M3/5B are not interchangeable without circuit review. The "CA" version is bidirectional with no polarity marking, while the "A" version is unidirectional and requires cathode alignment. Substituting one for the other may result in failed clamping or permanent device damage due to reverse-bias conduction in the unidirectional part.
What PCB pad layout is recommended for optimal thermal and surge performance of SMBJ170CA-M3/5B?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of SMBJ170CA-M3/5B to achieve rated 600 W peak pulse power and maintain RθJA ≤ 100 °C/W. Smaller pads reduce surge capability and increase junction temperature - derating curves in Figure 2 of datasheet 88392 show >20 % power loss at 0.1" pads. Thermal vias under pads further improve sustained power handling.
SMBJ170CA-M3/5B 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:
- -
- 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:
- DO-214AA (SMBJ)
SMBJ170CA-M3/5B FAQ
1.How can I place an order for SMBJ170CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CA-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ170CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ170CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CA-M3/5B?
SMBJ170CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CA-M3/5B 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-M3/5B?
For technical support, including SMBJ170CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ170CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ170CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ170CA-M3/5B?
All SMBJ170CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ170CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170CA-M3/5B Tags
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