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Vishay General Semiconductor - Diodes Division SMBJ188AHM3/I
- Part No.:
- SMBJ188AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188AHM3/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,158
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Product details
Overview
SMBJ188AHM3/I 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 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 V clamping voltage (VC) at 2.0 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom infrastructure.
For engineers reviewing the SMBJ188AHM3/I datasheet, SMBJ188AHM3/I pinout, SMBJ188AHM3/I application, or SMBJ188AHM3/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world clamping performance under repetitive surge conditions.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR range (209–231 V). Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of lightning-induced transients and inductive switching spikes on 150–200 V DC bus lines.
Rated for TJ = –55 °C to +150 °C, it exhibits 0.108 %/°C temperature coefficient of VBR, and thermal resistance RθJA = 100 °C/W (typ.) on standard 0.2" × 0.2" copper pads - requiring careful PCB layout for sustained 5.0 W steady-state dissipation at elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected line voltage. |
| VBR @ IT = 1 mA | 209–231 V - guaranteed breakdown range defining turn-on threshold under standardized test current. |
| VC @ IPPM = 2.0 A | 328 V - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 600 W - peak pulse power handling capability; defines survivability against single or low-duty-cycle surges. |
| IFSM | 100 A - non-repetitive forward surge current rating (8.3 ms half-sine); relevant for fault-current limiting in power stages. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on minimal pad layout; dictates required copper area for thermal management. |
| Package | SMB (DO-214AA) - surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C peak reflow profile. Cathode identified by black band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to ground or low-impedance return node; carries full surge current during clamping event. |
| Cathode | Reverse-biased terminal / protected line connection | Connected to line being protected (e.g., +188 V rail); voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on medium-voltage DC lines. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive power electronics applications including engine control modules and ADAS power supplies. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer equipment sold in EU, China, and Japan. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving margin for 200 V-rated components. |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift in harsh environments. |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Line Protection |
|---|---|
|
Use Scenario: Protecting 180–200 V DC output rails in switch-mode power supplies against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between output rail and chassis ground to shunt surge energy away from regulation ICs and output capacitors. Use Value: Limits transient voltage to ≤328 V, preserving reliability of 350 V-rated electrolytic capacitors and 250 V MOSFETs in primary-side snubbers. |
Use Scenario: Safeguarding -48 V or +180 V telecom DC distribution lines from lightning-induced surges entering via outdoor cable runs. IC Role / Device Role / Timing Role: Standoff-clamp device mounted at line entry point, coordinated with upstream gas discharge tubes for staged protection. Use Value: Provides <1 ns response and low clamping ratio (VC/VWM ≈ 1.74), reducing let-through energy to downstream DC-DC converters and interface ASICs. |
| Automotive Body Control Module (BCM) | Motor Drive DC Bus Protection |
|
Use Scenario: Protecting 12 V–24 V auxiliary power domains in BCMs where 188 V transients may arise from alternator load dump or relay coil de-energization. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary GDT or polymer PTC, absorbing residual energy not diverted upstream. Use Value: AEC-Q101 qualification ensures operation across –40 °C to +125 °C ambient, supporting long-term reliability in under-hood environments. |
Use Scenario: Clamping voltage spikes on 160–200 V DC links in BLDC motor drives caused by regenerative braking or IGBT switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across DC bus terminals to clamp dV/dt events and prevent gate driver latch-up. Use Value: 600 W rating supports repeated 10/1000 µs surges at 0.01% duty cycle, matching typical motor drive fault-clearing intervals. |
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/I | Same VWM, VBR, VC, and PPPM; RoHS-compliant but not halogen-free; no AEC-Q101 qualification. | Restricted to commercial-grade industrial and consumer applications without automotive qualification requirements. | Select when halogen-free content or automotive qualification is not mandated, and cost optimization is prioritized. |
| SMCJ188A-HM3 | Same electrical specs but in larger SMC (DO-214AB) package; higher IPPM (2.2 A) and lower RθJA (60 °C/W). | Better thermal performance enables higher surge repetition rates or use in compact layouts with limited copper area. | Choose when board space allows SMC footprint and improved thermal margin is needed for high-duty-cycle surge environments. |
Compared with SMBJ188AHM3/I, SMBJ188AHE3/I lacks halogen-free and AEC-Q101 compliance, while SMCJ188A-HM3 offers superior thermal dissipation at the cost of larger PCB area - making SMBJ188AHM3/I optimal for space-constrained, automotive-qualified 188 V rail protection.
Availability
SMBJ188AHM3/I is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC feeder systems, automotive body control modules, and motor drive DC bus protection requiring stable component supply and halogen-free compliance.
Supply support for SMBJ188AHM3/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 high-energy transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems where robustness and regulatory compliance are critical.
FAQ
What is the clamping voltage of SMBJ188AHM3/I at its rated peak pulse current?
The SMBJ188AHM3/I has a maximum clamping voltage (VC) of 328 V at 2.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured per ANSI/IEEE C62.35. The SMBJ188AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SMBJ188AHM3/I qualified for automotive applications?
Yes, SMBJ188AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix - denoting halogen-free, RoHS-compliant, and automotive-grade construction. It is validated for use in automotive electronic control units, body control modules, and powertrain subsystems where transient immunity and long-term reliability under thermal cycling are required. The SMBJ188AHM3/I meets all stress tests defined in AEC-Q101 Rev D.
How does the SMBJ188AHM3/I differ from the SMBJ188AHE3/I variant?
The SMBJ188AHM3/I and SMBJ188AHE3/I share identical electrical specifications (VWM, VBR, VC, PPPM) and package (SMB), but differ in material compliance: HM3 denotes halogen-free and AEC-Q101 qualification, whereas HE3 is RoHS-compliant only, without halogen-free certification or automotive qualification. The SMBJ188AHM3/I is therefore specified for automotive and environmentally regulated industrial deployments where both criteria apply.
What is the thermal resistance of SMBJ188AHM3/I, and how does it affect PCB layout?
The SMBJ188AHM3/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 value assumes minimal pad area; increasing copper area or adding thermal vias reduces RθJA and improves steady-state power handling. For reliable 5.0 W continuous dissipation, the SMBJ188AHM3/I requires careful thermal design - especially above 50 °C ambient - to avoid exceeding its 150 °C maximum junction temperature.
Can SMBJ188AHM3/I be used in bidirectional protection circuits?
No, SMBJ188AHM3/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified VBR/VWM values for reverse bias only. For bidirectional protection, Vishay offers the SMBJ188CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMBJ188AHM3/I in a bidirectional configuration would result in forward conduction and potential failure during positive transients; always match device polarity to system architecture.
SMBJ188AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ188AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188AHM3/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/I reliable?
The price and inventory of SMBJ188AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ188AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188AHM3/I?
SMBJ188AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188AHM3/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/I?
For technical support, including SMBJ188AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188AHM3/I requirements.
6.How does Aetrix verify that SMBJ188AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ188AHM3/I?
All SMBJ188AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ188AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188AHM3/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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