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Vishay General Semiconductor - Diodes Division SMBG188A-M3/5B
- Part No.:
- SMBG188A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG188A-M3/5B.pdf
- Description:
- TVS DIODE 188VWM 328VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,554
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Product details
Overview
SMBG188A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in 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), 2.0 A maximum reverse leakage at VWM, and clamps transients to ≤328 V at 2.0 A IPPM - deployed in automotive power electronics and industrial motor drive control circuits.
For engineers reviewing the SMBG188A-M3/5B datasheet, SMBG188A-M3/5B pinout, SMBG188A-M3/5B application, or SMBG188A-M3/5B equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal derating above 25 °C, unidirectional polarity alignment with DC bus topology, and AEC-Q101 qualification for under-hood deployment.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when reverse-biased voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for surface-mount use in the SMBG (DO-215AA) package, it delivers 600 W peak pulse power with 10/1000 μs waveform, supports 100 A non-repetitive forward surge (8.3 ms half-sine), and maintains operation across -55 °C to +150 °C junction temperature range - meeting automotive-grade thermal and mechanical robustness requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 209 V / 231 V at 1 mA - precise avalanche onset range; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | ≤328 V at 2.0 A - clamping voltage during full-rated surge; must stay below protected device's absolute max rating. |
| PPPM | 600 W (10/1000 μs) - energy-handling capacity for standard lightning/surge waveforms per IEC 61000-4-5. |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves system efficiency and prevents false triggering in high-impedance sensing paths. |
| TJ max | +150 °C - enables placement near heat sources (e.g., MOSFETs, gate drivers) without thermal shutdown risk. |
| AEC-Q101 | Qualified - validated for automotive applications including engine control units and body electronics modules. |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount gull-wing lead frame with matte tin-plated terminals, MSL Level 1 (260 °C reflow peak), RoHS-compliant and halogen-free (M3 suffix).
| 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 shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) without degradation when properly mounted on 5 mm × 5 mm copper pads. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| AEC-Q101 qualification | Validates reliability for automotive under-hood applications including powertrain and ADAS subsystems. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin. |
| MSL Level 1 rating | Permits standard SMT reflow without pre-baking, reducing manufacturing complexity and cost. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump transients up to 120 V and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and input filter capacitor. Use Value: Clamps load dump to ≤328 V while maintaining <1.0 μA leakage - preserving quiescent current budget in always-on modules. | Use Scenario: Safeguarding gate drivers and current-sense amplifiers in 3-phase inverter stages against IGBT switching-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-response clamping device on DC-link and auxiliary supply rails. Use Value: Sub-100 ns response time limits voltage overshoot on sensitive analog inputs, preventing latch-up in precision op-amps. |
| Telecom Power Interface | Renewable Energy Controller Input |
Use Scenario: Shielding PoE-powered equipment front-ends from induced surges on Ethernet cables and AC/DC adapter inputs. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input stage prior to DC-DC conversion. Use Value: 188 V VWM allows compatibility with wide-input 36–57 V PoE+ systems while providing ≥1.2× margin to max operating voltage. | Use Scenario: Protecting solar charge controller microcontroller I/O and sensor interfaces from lightning-induced surges on PV string inputs. IC Role / Device Role / Timing Role: Secondary-stage TVS on analog sensor lines (e.g., current shunt, voltage dividers) referenced to isolated grounds. Use Value: Ultra-low 1.0 μA ID prevents measurement error drift in high-impedance voltage monitoring circuits over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBG188A-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | No AEC-Q101 qualification; limited to industrial/commercial use. | Select when halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMBG188AHM3/5B | Identical electrical and thermal specs; adds AEC-Q101 qualification and halogen-free construction. | Explicitly qualified for automotive under-hood use per AEC-Q101 Rev G. | Prefer for new automotive designs requiring full compliance documentation and extended temperature validation. |
Compared with SMBG188A-M3/5B, the E3 variant lacks halogen-free certification and AEC-Q101 validation - limiting its use in regulated automotive programs; the HM3 variant offers identical performance with enhanced qualification scope, making it suitable for safety-critical vehicle subsystems where traceability and stress testing are mandated.
Availability
SMBG188A-M3/5B is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive protection, and telecom power interface applications requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SMBG188A-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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBG series of TRANSZORB® TVS diodes was engineered for high-power, surface-mount surge protection in automotive, industrial, and telecom infrastructure - balancing clamping performance, thermal robustness, and manufacturability.
FAQ
What is the clamping voltage of SMBG188A-M3/5B at its rated peak pulse current?
The SMBG188A-M3/5B has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 2.0 A using a 10/1000 μs waveform. This value is measured under standardized test conditions with the device mounted on 0.2" × 0.2" copper pads, and it defines the upper voltage limit imposed on protected circuitry during surge events. The SMBG188A-M3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBG188A-M3/5B suitable for automotive applications?
Yes, SMBG188A-M3/5B is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and power distribution modules. It operates reliably from -55 °C to +150 °C, withstands 100 A non-repetitive forward surge current, and meets MSL Level 1 reflow requirements. The SMBG188A-M3/5B is specifically intended for under-hood and chassis-mounted systems where thermal and mechanical robustness are critical.
What does the "M3" suffix indicate in SMBG188A-M3/5B?
The "M3" suffix in SMBG188A-M3/5B denotes halogen-free, RoHS-compliant construction and industrial-grade qualification. It distinguishes this variant from E3 (RoHS-compliant but not halogen-free) and HM3 (AEC-Q101 qualified + halogen-free). The M3 version retains AEC-Q101 qualification per the base SMBG188A family data sheet and is approved for use in automotive and industrial environments requiring both environmental compliance and reliability validation. SMBG188A-M3/5B meets JESD201 Class 2 whisker resistance.
How does SMBG188A-M3/5B differ from bidirectional variants like SMBG188CA?
SMBG188A-M3/5B is unidirectional, featuring cathode/anode polarity with a band marking the cathode; it conducts only in reverse bias above VBR. In contrast, SMBG188CA is bidirectional, symmetric in both directions, with no polarity marking and identical VBR in positive/negative quadrants. SMBG188A-M3/5B is used on DC lines where polarity is fixed, while SMBG188CA suits AC-coupled or differential signal lines. The SMBG188A-M3/5B offers lower leakage and tighter VBR tolerance than its CA counterpart.
What PCB layout guidance applies to SMBG188A-M3/5B for optimal surge handling?
For optimal surge performance, SMBG188A-M3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to ensure adequate thermal dissipation and current spreading. Trace inductance between the TVS and protected node must be minimized - keep leads short and wide, avoid vias in the surge path, and place the SMBG188A-M3/5B as close as possible to the connector or IC input. Ground connections should route directly to a solid ground plane, not daisy-chained through other components.
SMBG188A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG188A-M3/5B FAQ
1.How can I place an order for SMBG188A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG188A-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 SMBG188A-M3/5B reliable?
The price and inventory of SMBG188A-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 SMBG188A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG188A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG188A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG188A-M3/5B?
SMBG188A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG188A-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 SMBG188A-M3/5B?
For technical support, including SMBG188A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG188A-M3/5B requirements.
6.How does Aetrix verify that SMBG188A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG188A-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 SMBG188A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG188A-M3/5B?
All SMBG188A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG188A-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 SMBG188A-M3/5B part is unused and in its original packaging.
Return procedure for SMBG188A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG188A-M3/5B Tags
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