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Vishay General Semiconductor - Diodes Division SMBJ188AHM3/H
- Part No.:
- SMBJ188AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188AHM3/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,655
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Product details
Overview
SMBJ188AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping high-energy transients on power and signal lines. It features 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 V maximum clamping voltage (VC) at 2.0 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ188AHM3/H datasheet, SMBJ188AHM3/H pinout, SMBJ188AHM3/H application, or SMBJ188AHM3/H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity with cathode band marking, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a voltage-clamping protection device, leveraging an avalanche breakdown mechanism to divert transient energy away from sensitive downstream circuitry. Its unidirectional configuration enables integration into DC-biased lines where reverse conduction must be blocked - such as 188 V DC bus rails or high-voltage sensor supply paths.
The device meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, supports MSL Level 1 reflow (260 °C peak), and exhibits low incremental surge resistance for consistent clamping across repetitive surges. Its 150 °C maximum junction temperature and 100 A IFSM rating support robust operation in automotive and industrial environments with high ambient thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; defines safe DC bias limit for protected line |
| VBR min/max | 209 V / 231 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering above system overvoltage threshold |
| VC @ IPPM | 328 V at 2.0 A - Clamped voltage during full-rated 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 surge events |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C ambient |
| TJ max | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive or enclosed industrial enclosures |
| Polarity | Unidirectional - Cathode band marked; blocks reverse conduction while clamping positive transients on DC lines |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge only if biased |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 188 V rail); avalanche breakdown occurs here during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial equipment and telecom infrastructure |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for EU, China RoHS, and JEDEC J-STD-020 MSL Level 1 reflow (260 °C peak) |
| Low incremental surge resistance | Ensures stable clamping voltage across varying surge amplitudes - critical for protecting gate drivers and precision analog sensors |
| AEC-Q101 qualified option | Available with HM3/X suffix; certified for automotive powertrain and body electronics applications requiring extended reliability validation |
| Glass passivated chip junction | Enhances long-term stability and moisture resistance in humid or thermally cycling environments (e.g., outdoor industrial controllers) |
Applications
| Industrial Power Supply Protection | Automotive High-Voltage Sensor Interface |
|---|---|
|
Use Scenario: Protecting 188 V DC intermediate bus in programmable logic controller (PLC) power modules against inductive switching spikes from solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between bus rail and ground, triggered within <1 ns to limit transient overshoot. Use Value: Limits clamped voltage to 328 V, preventing damage to 400 V-rated DC-DC controllers and maintaining system uptime during factory floor EMI events. |
Use Scenario: Safeguarding battery voltage monitoring IC inputs in 48 V mild-hybrid vehicle systems exposed to load-dump transients up to 120 V. IC Role / Device Role / Timing Role: Standoff-rated TVS on sensor signal path, absorbing >600 W pulses without degradation across 1000+ surge cycles. Use Value: Enables direct interface to high-side sensing circuits without external series impedance, preserving signal integrity and measurement accuracy. |
| Telecom Rectifier Output Clamping | Motor Drive DC Link Surge Suppression |
|
Use Scenario: Clamping output of -48 V telecom rectifiers subjected to lightning-induced surges on distribution backplanes. IC Role / Device Role / Timing Role: Unidirectional suppression device mounted at rectifier output, conducting only during positive overvoltage events on negative-rail systems. Use Value: Maintains -48 V rail stability during 10/1000 µs surges up to 600 W, avoiding false shutdowns in carrier-grade power systems. |
Use Scenario: Protecting IGBT gate driver ICs from Miller-induced voltage spikes on 188 V DC link in HVAC inverter drives. IC Role / Device Role / Timing Role: Fast-response TVS placed across DC link capacitor terminals to clamp ringing and commutation transients. Use Value: Reduces gate oxide stress by limiting transient excursions to ≤328 V, extending IGBT lifetime and reducing field failure rates. |
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-M3/52 | Same electrical specs and SMB package; uses standard RoHS-compliant (non-halogen-free) molding compound | Lacks halogen-free certification; acceptable for non-regulated commercial applications but not for automotive or green procurement programs | Select when halogen-free compliance is not required and cost sensitivity outweighs environmental specification needs |
| SMCJ188A-HM3 | Higher-power SMC (DO-214AB) package with same 188 V VWM and 328 V VC, but rated for 1500 W PPPM | Requires larger PCB footprint and higher thermal mass; suited for higher-energy surge environments (e.g., outdoor substations) | Choose when system-level surge testing exceeds 600 W or when design margin requires ≥2× peak power headroom |
Compared with SMBJ188AHM3/H, SMBJ188A-M3/52 offers identical protection performance without halogen-free assurance, while SMCJ188A-HM3 delivers greater surge capacity at the cost of board space and thermal design complexity - making SMBJ188AHM3/H optimal for space-constrained, environmentally regulated 600 W-class protection.
Availability
SMBJ188AHM3/H is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, telecom rectifier outputs, and motor drive DC link protection requiring stable component supply and halogen-free compliance.
Supply support for SMBJ188AHM3/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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecom infrastructure where precise clamping, thermal resilience, and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ188AHM3/H under rated surge conditions?
The SMBJ188AHM3/H has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current of 2.0 A using the standardized 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 worst-case transient events. The SMBJ188AHM3/H maintains this clamping performance across its specified operating temperature range.
Is SMBJ188AHM3/H suitable for automotive applications?
Yes - the HM3 suffix indicates halogen-free, RoHS-compliant construction, and the part is available in AEC-Q101 qualified versions (e.g., SMBJ188AHM3_B/H). While SMBJ188AHM3/H itself is commercial-grade, its qualification-ready variant meets stress test requirements for automotive powertrain and body electronics. Always verify the specific ordering code's qualification status via Vishay's official documentation before deployment in safety-critical systems.
How does the SMBJ188AHM3/H differ from bidirectional TVS diodes like SMBJ188CA?
The SMBJ188AHM3/H is unidirectional and features a cathode band marking, allowing it to block reverse current while clamping positive transients - ideal for DC-biased lines. In contrast, SMBJ188CA is bidirectional with no polarity marking and clamps transients of either polarity, making it suitable for AC signal lines or floating buses. Their VWM and VC values differ accordingly: SMBJ188CA has lower VWM (typically 162 V) and symmetric clamping behavior.
What is the thermal resistance and how does it affect SMBJ188AHM3/H layout?
The SMBJ188AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means each watt of sustained power dissipation raises junction temperature by 100 °C above ambient. For reliable operation near its 5.0 W steady-state rating, PCB layout must provide adequate copper area and avoid thermal bottlenecks - especially important in sealed enclosures or high-temperature industrial settings where the SMBJ188AHM3/H may experience elevated ambient conditions.
Does SMBJ188AHM3/H require derating at elevated ambient temperatures?
Yes - the SMBJ188AHM3/H must be derated above TA = 25 °C per Figure 2 in Vishay document 88392. Its peak pulse power capability decreases linearly with rising junction temperature, reaching ~50 % of rated 600 W at TJ ≈ 100 °C. Since TJ = TA + (PD × RθJA), designers must calculate actual junction temperature under expected power dissipation and ambient conditions. The SMBJ188AHM3/H remains functional up to +150 °C TJ, but sustained operation above 125 °C requires careful thermal modeling and layout optimization.
SMBJ188AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMBJ188AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188AHM3/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 SMBJ188AHM3/H reliable?
The price and inventory of SMBJ188AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ188AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ188AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188AHM3/H?
SMBJ188AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188AHM3/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 SMBJ188AHM3/H?
For technical support, including SMBJ188AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188AHM3/H requirements.
6.How does Aetrix verify that SMBJ188AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ188AHM3/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 SMBJ188AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ188AHM3/H?
All SMBJ188AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188AHM3/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 SMBJ188AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ188AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188AHM3/H Tags
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