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Vishay General Semiconductor - Diodes Division SMBJ188D-M3/H
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- Part No.:
- SMBJ188D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188D-M3/H.pdf
- Description:
- TVS DIODE 188VWM 301VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
SMBJ188D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection of DC power rails and signal lines. It features a 188 V stand-off voltage (VWM), 212–228 V breakdown voltage (VBR) at 1 mA, 301 V clamping voltage (VC) at 2.03 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.
For engineers reviewing the SMBJ188D-M3/H datasheet, SMBJ188D-M3/H pinout, SMBJ188D-M3/H application, or SMBJ188D-M3/H equivalent, key selection criteria include verified clamping performance under 2.03 A surge, thermal resistance (RθJA = 125 °C/W on minimum pad), unidirectional polarity with cathode band marking, and M3-grade halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR (212–228 V), it avalanches to limit downstream voltage to ≤301 V at 2.03 A. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while ±3.5 % VBR tolerance enables precise overvoltage thresholding in high-reliability 188 V DC systems.
Designed for placement directly across protected nodes, SMBJ188D-M3/H delivers 600 W peak pulse power handling with 0.01 % duty cycle, derated linearly above 25 °C ambient per Fig. 2, and supports solder reflow up to 260 °C (MSL Level 1). Junction temperature remains within safe limits (TJ max = 150 °C) under 1.0 W steady-state dissipation at TA = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 188 V - maximum continuous reverse voltage before conduction begins; defines operating margin for 188 V nominal DC bus |
| VBR (Breakdown) | 212–228 V at 1.0 mA - tight ±3.5 % tolerance ensures consistent turn-on across production lots |
| VC (Clamping) | 301 V at IPPM = 2.03 A - limits transient voltage seen by downstream ICs or MOSFETs during surge events |
| PPPM | 600 W (10/1000 μs) - sustains single high-energy surges common in industrial load switching or lightning-induced coupling |
| ID (Leakage) | ≤0.5 μA at VWM - negligible standby power loss and no measurable impact on high-impedance sensor bias networks |
| RθJA | 125 °C/W (min pad layout) - requires thermal-aware PCB layout (e.g., ≥5 mm² copper pour) to maintain TJ ≤ 150 °C |
| Polarity | Unidirectional - cathode marked by band; blocks forward current, clamps only reverse transients |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. M3 suffix denotes JESD 201 Class 2 whisker resistance and industrial-grade reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping thresholds without post-production binning or calibration |
| 600 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 188 V DC distribution networks |
| Low leakage (≤0.5 μA at VWM) | Preserves accuracy in high-impedance voltage monitoring circuits and avoids false triggering |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without moisture sensitivity concerns or baking requirements |
| M3-grade whisker resistance | Ensures long-term solder joint integrity in industrial environments with thermal cycling and vibration |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 188 V DC link capacitors and IGBT gate drivers against inductive kickback from contactor switching and regenerative braking. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed across DC bus to divert surge energy to ground before voltage exceeds MOSFET or capacitor ratings. Use Value: Limits transient overvoltage to ≤301 V, preventing catastrophic failure of 200 V-rated electrolytic capacitors and 250 V IGBTs. |
Use Scenario: Input-stage surge suppression on -48 V or +188 V telecom rectifier outputs exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: Primary front-end TVS device absorbing multi-kA transients before they reach DC-DC converters and PMBus controllers. Use Value: Withstands 600 W pulses without degradation, maintaining system uptime in central office and remote radio head deployments. |
| Automotive Body Control Modules | Renewable Energy Inverters |
Use Scenario: Protection of LIN bus transceivers and microcontroller I/O pins connected to 12 V–188 V auxiliary power domains in vehicle lighting and HVAC subsystems. IC Role / Device Role / Timing Role: Localized unidirectional clamp on power input rails feeding MCU power management ICs. Use Value: Sub-1 ns response time prevents latch-up or ESD damage to 3.3 V logic during load dump events. |
Use Scenario: DC-side surge protection in solar string inverters where PV array open-circuit voltage reaches 188 V under STC, subject to grid-switching transients. IC Role / Device Role / Timing Role: Secondary-level TVS on DC bus between MPPT stage and H-bridge, complementing primary MOV-based protection. Use Value: Tight VBR tolerance ensures coordinated clamping with upstream protectors, avoiding premature conduction or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188A-M3/H | Bidirectional variant; symmetric clamping in both polarities; VWM = 188 V, VC = 301 V same, but ID = 0.5 μA applies to both directions | Required where AC-coupled signals or dual-polarity rails (e.g., RS-485, CAN FD) need protection without polarity assumptions | Select SMBJ188A-M3/H only if bidirectional clamping is explicitly required; SMBJ188D-M3/H offers lower leakage in unidirectional DC systems |
| SMCJ188A-M3/H | Larger SMC (DO-214AB) package; same VWM/VBR/VC specs but higher PPPM = 1500 W and RθJA = 75 °C/W | Suitable for higher-energy surge environments (e.g., substation controls) where 600 W is insufficient and board space allows larger footprint | Choose SMCJ188A-M3/H when surge energy exceeds SMBJ rating; otherwise SMBJ188D-M3/H provides optimal size-power balance for compact 188 V designs |
Compared with SMBJ188A-M3/H, SMBJ188D-M3/H delivers lower leakage and simpler polarity routing for DC-only systems; versus SMCJ188A-M3/H, it trades peak power for 30 % smaller PCB area and compatibility with dense SMT layouts.
Availability
SMBJ188D-M3/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply and guaranteed M3-grade reliability.
Supply support for SMBJ188D-M3/H 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 high-reliability diodes, MOSFETs, and passive components for demanding industrial, automotive, and computing applications.
The SMBJ series targets robust, surface-mount transient suppression in space-constrained DC power systems - engineered for repeatable clamping, low leakage, and full compliance with IEC 61000-4-5 and AEC-Q200 stress requirements.
FAQ
What is the clamping voltage of SMBJ188D-M3/H at its rated peak pulse current?
The SMBJ188D-M3/H has a maximum clamping voltage (VC) of 301 V at its peak pulse current (IPPM) of 2.03 A, measured using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range per Vishay Document 87606.
Is SMBJ188D-M3/H suitable for protecting a 188 V DC bus in an industrial PLC?
Yes, SMBJ188D-M3/H is specifically designed for this use case: its 188 V stand-off voltage (VWM) matches nominal 188 V DC bus levels, and its 212–228 V breakdown range ensures reliable conduction only during overvoltage faults. The 301 V clamping voltage provides adequate margin below typical 300–350 V DC-link capacitor ratings found in PLC power stages.
Does SMBJ188D-M3/H have a bidirectional variant, and how does it differ?
Yes - the bidirectional variant is SMBJ188A-M3/H. It shares identical VWM (188 V), VBR (212–228 V), and VC (301 V) specs but conducts in both directions, with leakage ≤0.5 μA in either polarity. Unlike SMBJ188D-M3/H, it lacks a cathode band and is used where polarity reversal or AC transients are present, such as in differential communication lines.
What is the thermal resistance of SMBJ188D-M3/H, and how does it affect PCB layout?
SMBJ188D-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout. To avoid exceeding the 150 °C maximum junction temperature, designers must provide adequate copper area - e.g., ≥5 mm × 5 mm thermal pads - especially under sustained 1.0 W power dissipation at 25 °C ambient.
How does the M3 suffix impact reliability and compliance of SMBJ188D-M3/H?
The M3 suffix on SMBJ188D-M3/H certifies halogen-free, RoHS-compliant construction, matte tin plating per J-STD-002, and JESD 201 Class 2 whisker resistance - critical for long-term reliability in industrial and automotive applications subject to thermal cycling and vibration. It also confirms compliance with UL 94 V-0 flammability standards for the molding compound.
SMBJ188D-M3/H 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):
- 188V
- Voltage - Breakdown (Min):
- 212V
- Voltage - Clamping (Max) @ Ipp:
- 301V
- Current - Peak Pulse (10/1000µs):
- 2.03A
- 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)
SMBJ188D-M3/H FAQ
1.How can I place an order for SMBJ188D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188D-M3/H 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 SMBJ188D-M3/H reliable?
The price and inventory of SMBJ188D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ188D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ188D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188D-M3/H?
SMBJ188D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188D-M3/H 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 SMBJ188D-M3/H?
For technical support, including SMBJ188D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188D-M3/H requirements.
6.How does Aetrix verify that SMBJ188D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ188D-M3/H 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 SMBJ188D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ188D-M3/H?
All SMBJ188D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188D-M3/H, 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 SMBJ188D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ188D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188D-M3/H Tags
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