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Vishay General Semiconductor - Diodes Division SMBJ188CAHM3/I
- Part No.:
- SMBJ188CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188CAHM3/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,656
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Product details
Overview
SMBJ188CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 328 V at 2.0 A peak pulse current, and operates across –55 °C to +150 °C junction temperature range - deployed in industrial power supplies and telecom line interfaces.
For engineers reviewing the SMBJ188CAHM3/I datasheet, SMBJ188CAHM3/I pinout, SMBJ188CAHM3/I application, or SMBJ188CAHM3/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal derating curves, AEC-Q101 qualification status, and real-world use context for overvoltage protection design validation.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance, enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes. Its symmetrical I-V characteristics ensure identical clamping performance in both polarities without polarity marking.
The device is rated for 600 W peak pulse power under standardized 10/1000 µs waveform with 0.01% duty cycle, and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on recommended 5.0 mm × 5.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 209 V / 231 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 328 V at 2.0 A - Clamped voltage during full-rated 600 W transient; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability under 10/1000 µs waveform; defines transient energy absorption capacity. |
| IPPM | 2.0 A - Peak pulse current corresponding to 600 W clamping; used for PCB trace sizing and fuse coordination. |
| TJ max. | +150 °C - Maximum junction temperature; sets thermal design limits for sustained surge repetition or ambient conditions. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetric; both ends function identically under reverse or forward transient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient return path (bidirectional) | Provides low-impedance path to ground or rail during either polarity surge; no fixed polarity reference. |
| Cathode (Terminal 2) | Transient return path (bidirectional) | Functionally identical to Terminal 1; symmetrical conduction enables dual-direction clamping without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout or orientation verification during assembly. |
| 600 W peak pulse power | Rated per 10/1000 µs waveform - provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted. |
| AEC-Q101 qualified | Qualified per HM3 suffix - validated for automotive powertrain and body electronics where reliability under thermal cycling and humidity is critical. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-20 and JESD201 Class 2 whisker resistance - supports lead-free reflow and long-term solder joint integrity. |
| Low thermal resistance | RθJA = 100 °C/W on 5 mm × 5 mm pads - enables higher surge repetition rates without exceeding TJ max. of 150 °C. |
Applications
| Industrial Power Input Protection | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: AC/DC power supply input stage exposed to lightning-induced surges on 24 V DC distribution lines in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input rails to limit transient voltage before it reaches upstream rectifiers and downstream DC-DC controllers. Use Value: Clamps 188 V nominal system to ≤328 V during 600 W transients, preventing damage to 400 V-rated bulk capacitors and MOSFET gate oxides. |
Use Scenario: Protection of RS-485 transceivers connected to outdoor field wiring subject to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional shunt device placed between differential pair (A/B) and ground to suppress common-mode transients without disrupting DC bias. Use Value: Symmetrical clamping maintains signal integrity during ±328 V transients while preserving receiver common-mode range and fail-safe operation. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: 12 V battery-supplied BCM modules exposed to load-dump transients (ISO 7637-2 Pulse 5a) and ESD events on switch inputs. IC Role / Device Role / Timing Role: Secondary-level TVS on microcontroller I/O lines and LIN bus nodes to absorb fast-rising ESD (IEC 61000-4-2) and slower load-dump energy. Use Value: AEC-Q101 qualification ensures stable clamping performance after 1000+ thermal cycles; 2.0 A IPPM handles typical ISO 7637-2 edge currents. |
Use Scenario: Protection of H-bridge gate drivers in washing machine motor control boards subjected to back-EMF spikes during brushless motor commutation. IC Role / Device Role / Timing Role: Rail-to-rail clamp across half-bridge supply rails to suppress inductive kickback and prevent shoot-through due to voltage overshoot. Use Value: 188 V VWM allows operation near 160 V DC bus while clamping transients to 328 V - within safe SOA of 600 V MOSFETs. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial-grade industrial equipment where automotive reliability is not required. | Select when halogen-free content and automotive qualification are not mandated by end-customer specifications. |
| SMLJ188CAHM3/I | Same VWM/VBR/VC, but SMC (DO-214AB) package - larger footprint (7.11 mm × 6.22 mm) and higher PPPM (1500 W). | Used where higher surge energy handling is needed and PCB space permits larger package. | Choose only if system-level surge testing exceeds 600 W or requires extended thermal mass for repetitive surges. |
Compared with SMBJ188CAHE3/I, the SMBJ188CAHM3/I adds halogen-free construction and AEC-Q101 qualification without altering clamping behavior; versus SMLJ188CAHM3/I, it trades 900 W lower pulse power for 40% smaller PCB area and compatibility with tighter pitch layouts.
Availability
SMBJ188CAHM3/I is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface protection, automotive body control modules, and consumer appliance motor drive applications requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ188CAHM3/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 environments - targeting industrial, automotive, and telecom systems where failure due to voltage surges must be eliminated through proven silicon junction design and rigorous qualification.
FAQ
What is the clamping voltage of SMBJ188CAHM3/I at its rated peak pulse current?
The SMBJ188CAHM3/I has a maximum clamping voltage (VC) of 328 V at its rated peak pulse current (IPPM) of 2.0 A under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during full-rated transient events. The SMBJ188CAHM3/I maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is SMBJ188CAHM3/I suitable for automotive applications?
Yes, SMBJ188CAHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix and Vishay's ordering information table (page 3, document 88392). This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - making SMBJ188CAHM3/I appropriate for automotive body electronics, infotainment power rails, and sensor interface protection where reliability under thermal and environmental stress is mandatory.
How does the bidirectional design of SMBJ188CAHM3/I affect PCB layout?
The SMBJ188CAHM3/I has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation alignment - either terminal can connect to the protected line or ground/reference rail. This simplifies placement, eliminates risk of reverse installation, and supports compact routing in differential or floating systems like RS-485 or isolated DC-DC feedback paths. The SMBJ188CAHM3/I's DO-214AA footprint remains unchanged regardless of connection direction.
What is the maximum operating temperature for SMBJ188CAHM3/I?
The SMBJ188CAHM3/I has a maximum junction temperature (TJ) of +150 °C, as specified in the "Maximum Ratings" table (page 1, document 88392). This rating applies under steady-state and transient conditions, provided thermal design - such as copper pad area (minimum 5.0 mm × 5.0 mm per terminal) and ambient temperature - keeps actual junction temperature within limit. Derating curves in Figure 2 confirm usable pulse power decreases linearly above 25 °C ambient.
Does SMBJ188CAHM3/I meet RoHS and halogen-free requirements?
Yes, SMBJ188CAHM3/I is both RoHS-compliant and halogen-free, as explicitly stated in the "Mechanical Data" section (page 1, document 88392): "Base P/N-M3 - halogen-free, RoHS-compliant, commercial grade" and "Base P/NHM3_X - halogen-free, RoHS-compliant, and AEC-Q101 qualified". The "HM3" suffix confirms compliance with JEDEC J-STD-20 and JESD201 Class 2 whisker resistance standards for lead-free assembly.
SMBJ188CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ188CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188CAHM3/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/I reliable?
The price and inventory of SMBJ188CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ188CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188CAHM3/I?
SMBJ188CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188CAHM3/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/I?
For technical support, including SMBJ188CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188CAHM3/I requirements.
6.How does Aetrix verify that SMBJ188CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ188CAHM3/I?
All SMBJ188CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ188CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188CAHM3/I Tags
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