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Vishay General Semiconductor - Diodes Division SMBJ188AHM3_B/I
- Part No.:
- SMBJ188AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188AHM3_B/I.pdf
- Description:
- 600W,188V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,458
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Product details
Overview
SMBJ188AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown range (VBR), 328 V maximum clamping voltage (VC) at 2.0 A peak pulse current (IPPM), 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 SMBJ188AHM3_B/I datasheet, SMBJ188AHM3_B/I pinout, SMBJ188AHM3_B/I application, or SMBJ188AHM3_B/I equivalent, key selection criteria include clamping performance under 2.0 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, halogen-free RoHS compliance (HM3 suffix), and AEC-Q101 qualification readiness per ordering code structure.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR (209–231 V). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables rapid energy dissipation during transients.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance from junction-to-ambient at 100 °C/W on standard 0.2" × 0.2" copper pads. It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 209 V / 231 V - Breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 328 V - Clamped voltage at 2.0 A peak pulse current (10/1000 µs); determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling capability; supports high-energy surges without failure. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood or enclosed industrial environments. |
| RθJA | 100 °C/W - Thermal resistance to ambient on standard PCB pad layout; informs heatsinking and power derating needs. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, cathode indicated by band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), compliant with IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge (e.g., ESD event polarity reversal). |
| Cathode | Reverse-biased clamping terminal | Connected to higher-potential side (e.g., +188 V rail); avalanche breakdown initiates here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in industrial switching and load dump scenarios without degradation. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for automotive and EU industrial equipment without compromising surge robustness. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risk. |
| AEC-Q101 qualification path (HM3_X) | Enables drop-in use in automotive applications requiring stress-tested reliability, including BCM and ADAS power domains. |
| Low clamping ratio (VC/VBR ≈ 1.47) | Minimizes overvoltage overshoot during clamping, protecting downstream MOSFETs and controllers with tight VDS(max) margins. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against inductive kickback and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across DC bus or gate resistor network to limit transient voltage excursions. Use Value: Prevents gate oxide rupture in 600 V IGBTs by clamping spikes to ≤328 V, maintaining system uptime in factory automation systems. |
Use Scenario: Input-stage overvoltage suppression in 48 V telecom rectifiers exposed to AC line surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary-level TVS connected between +48 V input and chassis ground to shunt surge energy before DC/DC converters. Use Value: Ensures EN 61000-4-5 Level 4 (4 kV) compliance with single-device solution, reducing BOM count vs. multi-stage designs. |
| Automotive Body Control Modules | Industrial PLC I/O Modules |
|
Use Scenario: Load-dump protection on 12 V/24 V supply inputs in BCMs controlling lighting, wipers, and door locks. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at power entry point to absorb ISO 7637-2 Pulse 5a (up to 35 V, 400 ms) energy. Use Value: Maintains functional safety integrity by preventing microcontroller brown-out or reset during alternator load dump events. |
Use Scenario: Field-side protection of analog input channels (e.g., 4–20 mA loops) against wiring faults and ESD in harsh factory environments. IC Role / Device Role / Timing Role: Low-leakage TVS placed across input terminals to suppress fast transients while preserving signal accuracy. Use Value: Limits reverse leakage to <1.0 µA at 188 V, avoiding measurement drift in precision current-loop receivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188AHE3_B/I | RoHS-compliant (E3), non-halogen-free; same electrical specs and AEC-Q101 qualification path. | Preferred for commercial/industrial designs where halogen-free mandate does not apply. | Select SMBJ188AHE3_B/I when halogen content is unrestricted and cost optimization is prioritized. |
| SMCJ188A-HM3 | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Better suited for high-power industrial inverters requiring >600 W surge margin and enhanced thermal mass. | Choose SMCJ188A-HM3 only if board space allows larger footprint and higher pulse power headroom is required. |
Compared with SMBJ188AHM3_B/I, the HE3 variant offers identical protection performance with lower material cost but lacks halogen-free certification, while the SMCJ188A-HM3 delivers greater surge capacity at the expense of PCB area and thermal interface design complexity.
Availability
SMBJ188AHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMBJ188AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-reliability transient suppression in demanding power and signal-line applications, balancing compact size, precise clamping, and automotive-grade robustness.
FAQ
What is the maximum clamping voltage of SMBJ188AHM3_B/I under a 10/1000 µs surge?
The SMBJ188AHM3_B/I has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current of 2.0 A with a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events, ensuring compatibility with 300 V-rated downstream components.
Is SMBJ188AHM3_B/I qualified for automotive applications?
SMBJ188AHM3_B/I uses the HM3 suffix indicating halogen-free, RoHS-compliant construction and is part of the AEC-Q101 qualified SMBJ family. While the base part number itself is not pre-certified, ordering with revision code "_B" (e.g., SMBJ188AHM3_B/I) confirms it meets AEC-Q101 stress test requirements when manufactured per Vishay's qualified process flow.
What does the "HM3" suffix mean in SMBJ188AHM3_B/I?
The "HM3" suffix in SMBJ188AHM3_B/I denotes halogen-free, RoHS-compliant packaging and materials per IEC 61249-2-21, with matte tin-plated leads meeting J-STD-002 solderability and JESD22-B102 whisker resistance Class 2. It distinguishes this variant from E3 (RoHS only) and HE3/HM3_X (AEC-Q101 qualified) versions.
Can SMBJ188AHM3_B/I be used in bidirectional protection circuits?
No - SMBJ188AHM3_B/I is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies the CA suffix (e.g., SMBJ188CA). Using SMBJ188AHM3_B/I in reverse-biased configurations outside its specified unidirectional operation risks premature failure or undefined clamping behavior.
What is the thermal resistance of SMBJ188AHM3_B/I, and how does it affect layout?
SMBJ188AHM3_B/I 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 requires adequate copper pour and thermal vias in high-duty-cycle surge environments; exceeding 150 °C junction temperature risks parametric shift or catastrophic failure.
SMBJ188AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ188AHM3_B/I FAQ
1.How can I place an order for SMBJ188AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188AHM3_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 SMBJ188AHM3_B/I reliable?
The price and inventory of SMBJ188AHM3_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 SMBJ188AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ188AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188AHM3_B/I?
SMBJ188AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188AHM3_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 SMBJ188AHM3_B/I?
For technical support, including SMBJ188AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ188AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188AHM3_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 SMBJ188AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ188AHM3_B/I?
All SMBJ188AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188AHM3_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 SMBJ188AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ188AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188AHM3_B/I Tags
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DESD3V3E1BL-7B
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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