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Vishay General Semiconductor - Diodes Division SMBJ188CA-M3/5B
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- Part No.:
- SMBJ188CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188CA-M3/5B.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
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Product details
Overview
SMBJ188CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 µs), and clamps to ≤328 V at 2.0 A peak pulse current - used in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ188CA-M3/5B datasheet, SMBJ188CA-M3/5B pinout, SMBJ188CA-M3/5B application, or SMBJ188CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, 188 V operating voltage margin, thermal resistance (RθJA = 100 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 10/1000 µs waveform rating reflects standardized surge immunity testing per ANSI/IEEE C62.35.
The SMBJ188CA-M3/5B is rated for -55 °C to +150 °C junction temperature, supports automated SMT placement, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 20 Ω typical junction-to-lead thermal resistance (RθJL) enables effective heat dissipation into PCB copper pads during repetitive surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 170–188 V DC bus or signal lines. |
| VBR (min/max) | 209 V / 231 V at 1.0 mA - guaranteed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤328 V at 2.0 A - clamped voltage under 10/1000 µs surge; determines protected circuit's maximum transient exposure level. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| ID @ VWM | ≤1.0 µA - reverse leakage at full stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in high-ambient industrial or automotive under-hood environments. |
| Package | SMB (DO-214AA) - industry-standard 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with standard reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals function identically as anode/cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no fixed polarity required in layout. |
| Terminal 2 | Anode/Cathode (bidirectional) | Complementary terminal completing the symmetrical clamping path; enables placement across differential or single-ended lines without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, Ethernet PHY) without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment up to Level 4 (4 kV line-earth, 2 kV line-line). |
| Halogen-free, RoHS-compliant (M3 suffix) | Complies with environmental regulations and JESD201 Class 2 whisker resistance, supporting long-term reliability in high-vibration applications. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly processes without moisture sensitivity concerns or baking requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, inductive switch-off), improving protection margin for downstream ICs. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (RS-485) in factory automation PLC modules from inductive switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or signal-to-ground to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to precision ADCs, isolators, and transceivers operating near 18 V–24 V rails with 188 V standoff headroom. |
Use Scenario: Shielding Ethernet PHY and PoE interface circuitry in network switches and base stations from induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Primary line-side TVS element shunting common-mode and differential-mode transients before front-end magnetics and PHY ICs. Use Value: Maintains signal integrity by clamping to ≤328 V within nanoseconds, preserving Ethernet link stability during 10/1000 µs surges up to 2.0 A. |
| Power Supply Input Stage | Automotive Body Control Module |
Use Scenario: Safeguarding 24 V DC input rails of industrial power supplies against load dump and back-EMF from relay coils or solenoids. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary fuse and MOV, providing precise, low-leakage regulation at 188 V nominal. Use Value: Extends system uptime by preventing false trips or MOSFET gate oxide failure during 100–500 V, 50 ms load-dump events. |
Use Scenario: Protecting LIN bus and sensor supply lines in body control units exposed to ISO 7637-2 Pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: AEC-Q101-qualified variant enabler (via HM3 suffix); this M3 version supports non-automotive BCU designs requiring same electrical specs. Use Value: Delivers validated clamping performance at -40 °C to +125 °C ambient, ensuring robustness in engine bay–adjacent mounting locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188CA-E3/5B | RoHS-compliant with standard tin plating (not halogen-free); same electrical specs and SMB package. | Preferred for commercial-grade systems where halogen-free material is not mandated by regulatory or OEM policy. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary. |
| SMD5.0-188CA | Same VWM/VBR/PPPM but in larger SMA (DO-214AC) package; higher RθJA (~125 °C/W) and lower surge current derating above 25 °C. | Used where legacy board layouts or mechanical clearance constraints prevent SMB footprint adoption. | Choose only if existing design uses SMA footprint and thermal margin allows reduced surge capability at elevated ambient. |
Compared with SMBJ188CA-E3/5B, the M3 version adds halogen-free compliance without sacrificing electrical performance; versus SMD5.0-188CA, the SMBJ188CA-M3/5B delivers superior thermal efficiency and space savings, making it optimal for high-density industrial PCBs.
Availability
SMBJ188CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and 24 V power supply input stages requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance.
Supply support for SMBJ188CA-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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and transportation systems where consistent clamping and long-term stability are critical.
FAQ
What is the breakdown voltage range for SMBJ188CA-M3/5B?
The SMBJ188CA-M3/5B has a guaranteed breakdown voltage (VBR) range of 209 V to 231 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This symmetric bidirectional specification ensures reliable clamping initiation across manufacturing lots and temperature extremes, directly supporting its use in 188 V stand-off applications such as 24 V DC systems with high-energy surge margins.
Is SMBJ188CA-M3/5B suitable for automotive applications?
The SMBJ188CA-M3/5B itself is commercial-grade and halogen-free RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the HM3 variant (e.g., SMBJ188CAHM3_B/I), which shares identical electrical specs and SMB package but adds AEC-Q101 qualification. Engineers must select the HM3 suffix version when designing to automotive reliability standards.
What is the maximum clamping voltage of SMBJ188CA-M3/5B under surge conditions?
The SMBJ188CA-M3/5B clamps to a maximum of 328 V at its rated peak pulse current of 2.0 A with a 10/1000 µs waveform. This value is measured under standardized test conditions (mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does SMBJ188CA-M3/5B require orientation during PCB placement?
No - SMBJ188CA-M3/5B is a bidirectional TVS diode with symmetrical terminals and no polarity marking. Either end functions as anode or cathode depending on transient polarity, eliminating orientation constraints during automated placement and simplifying layout for differential or floating signal lines such as RS-485 or Ethernet pairs.
How does the M3 suffix affect the specifications of SMBJ188CA-M3/5B?
"M3" denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD201 Class 2 whisker resistance - all electrical and thermal parameters (VWM, VBR, PPPM, RθJA) remain identical to the E3 version. The M3 suffix addresses environmental compliance and long-term reliability in high-humidity or vibration-prone deployments without altering surge performance or footprint.
SMBJ188CA-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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 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)
SMBJ188CA-M3/5B FAQ
1.How can I place an order for SMBJ188CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188CA-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 SMBJ188CA-M3/5B reliable?
The price and inventory of SMBJ188CA-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 SMBJ188CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ188CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188CA-M3/5B?
SMBJ188CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188CA-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 SMBJ188CA-M3/5B?
For technical support, including SMBJ188CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ188CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ188CA-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 SMBJ188CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ188CA-M3/5B?
All SMBJ188CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188CA-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 SMBJ188CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ188CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188CA-M3/5B Tags
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