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Vishay General Semiconductor - Diodes Division SMBJ188CAHM3_B/I
- Part No.:
- SMBJ188CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188CAHM3_B/I.pdf
- Description:
- 600W,188V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,232
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Product details
Overview
SMBJ188CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients up to 328 V at 2.0 A peak pulse current, with 600 W peak pulse power (10/1000 µs), 188 V stand-off voltage, and 209–231 V breakdown voltage range - deployed for surge protection on industrial sensor signal lines, telecom interface ports, and MOSFET gate drive circuits.
For engineers reviewing the SMBJ188CAHM3_B/I datasheet, SMBJ188CAHM3_B/I pinout, SMBJ188CAHM3_B/I application, or SMBJ188CAHM3_B/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and real-world use context for ESD and lightning-induced transient suppression in harsh environments.
Technical Context
This TVS diode operates as a bidirectional clamping device with symmetrical avalanche breakdown in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its 188 V stand-off voltage ensures compatibility with high-voltage industrial bus systems (e.g., 170–200 V DC rails), while its 328 V maximum clamping voltage at IPPM defines the upper voltage limit imposed on protected circuitry during a 10/1000 µs surge.
The device features glass-passivated junction construction for stable leakage performance (<1.0 µA at VWM), low incremental surge resistance for effective energy diversion, and MSL Level 1 moisture sensitivity rating (peak reflow ≤260 °C). It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system rail margin for reliable standby operation. |
| VBR (min/max) | 209 V / 231 V - Breakdown occurs within this band at 1 mA test current; defines guaranteed conduction onset under transient stress. |
| VC @ IPPM | 328 V - Clamped voltage at 2.0 A peak pulse current (10/1000 µs); determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; supports single-event surges up to 600 W without failure when mounted per recommended pad layout. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires adequate PCB copper area (0.2" × 0.2") to maintain TJ ≤150 °C under repetitive surges. |
| IPPM | 2.0 A - Peak pulse current corresponding to VC = 328 V; used to size series impedance and verify coordination with upstream fuses or PTCs. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables operation in under-hood or enclosed industrial enclosures without derating below 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical anode/cathode pair; matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Accepts reverse surge current during negative polarity transients; forms one side of symmetrical clamping path. |
| Cathode | Transient current entry (positive half-cycle) | Accepts forward surge current during positive polarity transients; completes bidirectional clamping loop with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without polarity concerns - e.g., RS-485, CAN FD, or Ethernet PHY interfaces. |
| 600 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) when coordinated with appropriate series impedance and PCB layout. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules and infotainment power supplies where reliability under thermal cycling and vibration is critical. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing and end-of-life recycling. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without baking or special handling - reduces production line complexity and cost. |
Applications
| Industrial Sensor Signal Protection | Telecom Interface Surge Suppression |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop sensors and analog voltage outputs (0–10 V) in factory automation PLC I/O modules exposed to inductive switching noise and ground bounce. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal and return lines to limit transients to <328 V, preventing op-amp input saturation or ADC damage. Use Value: Maintains signal integrity during 1 kV/µs fast-rising transients while drawing <1.0 µA leakage at 188 V, minimizing offset error in precision measurement paths. |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs in outdoor base stations and DSLAM equipment subjected to lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Paired SMBJ188CAHM3_B/I devices (line-to-ground) provide symmetrical clamping for differential bus protection without disrupting DC bias or signal swing. Use Value: Withstands repeated 600 W surges while maintaining <0.1% capacitance change (CJ ≈100 pF at 0 V), preserving signal rise time and eye diagram integrity up to 10 Mbps. |
| High-Voltage DC Bus Monitoring | Automotive Body Control Module Inputs |
|
Use Scenario: Guarding voltage dividers and isolation amplifiers monitoring 200 V DC battery banks in solar inverters and EV charging infrastructure against load dump and switching spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between divider output and MCU ADC input to prevent latch-up or permanent gate oxide damage during >200 V overshoot events. Use Value: 188 V VWM allows safe operation at nominal 200 V bus with 6% margin, while 328 V clamping prevents exceedance of 3.3 V or 5 V logic-level ADC absolute maximum ratings. |
Use Scenario: Protecting LIN bus receivers and switch inputs in automotive BCMs connected to 12 V/24 V vehicle batteries vulnerable to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS installed at connector entry point to shunt surge energy before it reaches internal level-shifting and filtering networks. Use Value: AEC-Q101 qualification ensures survival through 1000+ thermal cycles (-40 °C to +125 °C), and 2.0 A IPPM rating matches ISO 7637-2 Pulse 5a waveform energy (50 V/100 ms). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188CAHE3_B/I | Same electrical specs, but RoHS-compliant commercial grade (non-AEC-Q101); uses standard tin plating without halogen-free compound. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ188CAHE3_B/I for cost-sensitive non-automotive applications requiring identical clamping performance and footprint. |
| SMAJ188CAHM3_A/I | Lower power rating (400 W vs. 600 W), same VWM/VBR, SMA package (smaller footprint, higher RθJA = 140 °C/W). | Reduced surge handling; requires tighter thermal design and cannot meet IEC 61000-4-5 Level 4 without derating. | Choose SMAJ188CAHM3_A/I only when board space is constrained and surge threat level is limited to IEC Level 2 or lower. |
Compared with SMBJ188CAHM3_B/I, the HE3 variant offers identical clamping but lacks automotive qualification and halogen-free compliance, while the SMAJ variant sacrifices 33% peak power and thermal robustness for smaller size - making SMBJ188CAHM3_B/I the optimal choice for high-reliability, high-energy transient environments demanding AEC-Q101 and 600 W capability.
Availability
SMBJ188CAHM3_B/I is available at Aetrix Electronics and suitable for industrial sensor protection, telecom interface hardening, and automotive body control module designs requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ188CAHM3_B/I 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh electromagnetic environments - targeting industrial automation, automotive electronics, and telecom infrastructure where consistent clamping performance and long-term stability are mission-critical.
FAQ
What is the clamping voltage of SMBJ188CAHM3_B/I at its rated peak pulse current?
The SMBJ188CAHM3_B/I has a maximum clamping voltage (VC) of 328 V at its specified peak pulse current (IPPM) of 2.0 A under the standard 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ188CAHM3_B/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per the recommended 0.2" × 0.2" copper pad layout.
Is SMBJ188CAHM3_B/I suitable for automotive applications?
Yes, SMBJ188CAHM3_B/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and automotive-grade). It is validated for use in automotive body control modules, infotainment power supplies, and LIN/CAN node protection where reliability under thermal cycling, vibration, and load-dump conditions is required. The SMBJ188CAHM3_B/I meets all stress tests defined in AEC-Q101 Rev D, including high-temperature operating life and unbiased highly accelerated stress testing.
How does the bidirectional nature of SMBJ188CAHM3_B/I affect its placement in a circuit?
The SMBJ188CAHM3_B/I has no polarity marking and functions identically in both directions, making it ideal for protecting AC-coupled, differential, or floating signal paths - such as RS-485 buses or transformer-isolated interfaces - without requiring orientation verification during assembly. Unlike unidirectional TVS diodes, the SMBJ188CAHM3_B/I clamps transients of either polarity across the same two terminals, simplifying layout and eliminating risk of reverse installation. Its symmetrical VBR (209–231 V) ensures matched response in both directions.
What is the maximum leakage current of SMBJ188CAHM3_B/I at its stand-off voltage?
The SMBJ188CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 188 V, measured at TA = 25 °C. This low leakage ensures minimal impact on high-impedance sensing circuits, such as voltage dividers feeding precision ADCs or current-loop receivers. Leakage remains below 5 µA even at elevated temperatures up to +85 °C, supporting stable operation in thermally demanding industrial enclosures.
Does SMBJ188CAHM3_B/I require special PCB layout considerations?
Yes - to achieve rated 600 W peak pulse power and maintain thermal safety, the SMBJ188CAHM3_B/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay datasheet 88392. Smaller pads increase thermal resistance, causing junction temperature to exceed 150 °C during surge events and risking parametric shift or failure. The SMBJ188CAHM3_B/I also benefits from short, wide traces to minimize inductance and preserve clamping speed during fast transients.
SMBJ188CAHM3_B/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ188CAHM3_B/I FAQ
1.How can I place an order for SMBJ188CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188CAHM3_B/I 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 SMBJ188CAHM3_B/I reliable?
The price and inventory of SMBJ188CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ188CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ188CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188CAHM3_B/I?
SMBJ188CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188CAHM3_B/I 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 SMBJ188CAHM3_B/I?
For technical support, including SMBJ188CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ188CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188CAHM3_B/I 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 SMBJ188CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ188CAHM3_B/I?
All SMBJ188CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188CAHM3_B/I, 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 SMBJ188CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ188CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188CAHM3_B/I Tags
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