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Vishay General Semiconductor - Diodes Division SMBJ188AHM3_A/I
- Part No.:
- SMBJ188AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ188AHM3_A/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,883
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Product details
Overview
SMBJ188AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, rated for 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), and 600 W peak pulse power (10/1000 µs). It clamps transients to ≤328 V at 2.0 A IPPM and is halogen-free, RoHS-compliant, and AEC-Q101 qualified - designed for automotive power line and industrial sensor interface protection.
For engineers reviewing the SMBJ188AHM3_A/I datasheet, SMBJ188AHM3_A/I pinout, SMBJ188AHM3_A/I application, or SMBJ188AHM3_A/I equivalent, key selection criteria include its 188 V VWM rating, 328 V clamping voltage at rated surge current, AEC-Q101 qualification status, SMB package thermal resistance (RθJA = 100 °C/W), and unidirectional polarity with cathode band marking.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector, leveraging an avalanche breakdown mechanism to limit transient voltages across protected circuits. Its unidirectional configuration allows forward conduction only during reverse-biased surges, with VF ≤ 3.5 V at 50 A IF (per spec note).
Designed for high-reliability environments, SMBJ188AHM3_A/I meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports automated placement, and features glass-passivated junctions for stable leakage performance (ID ≤ 1.0 µA at VWM). Thermal derating follows Fig. 2, with full power capability maintained up to TJ = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before clamping initiates; defines upper limit of normal circuit operation. |
| VBR (min/max) | 209 V / 231 V at IT = 1.0 mA - guaranteed avalanche onset range; ensures predictable turn-on under transients. |
| VC @ IPPM | 328 V at 2.0 A - clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs or MOSFETs. |
| PPPM | 600 W - peak pulse power handling (10/1000 µs waveform); enables robust protection against lightning-induced or inductive-switching spikes. |
| ID @ VWM | ≤1.0 µA - reverse leakage at rated stand-off; critical for low-power sensor or battery-backed circuits where quiescent current matters. |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive or industrial enclosures without forced cooling. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal (in forward bias) | Connected to lower-potential side of protected line; conducts during positive surges when used in reverse-biased clamping configuration. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential side (e.g., VBUS or signal line); avalanche breakdown occurs here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and chassis applications per stress test requirements - supports PPAP and long-term reliability in harsh environments. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for EU, China RoHS, and automotive ELV directives without compromising surge robustness. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients common in 12 V/24 V vehicle systems and industrial motor drives without degradation. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving protection margin for sensitive receivers. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination risk. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VBAT and GND, shunting surge energy away from downstream ICs during ISO 16750-2 load dump events. Use Value: Clamps to ≤328 V at 2.0 A, limiting stress on 3.3 V/5 V logic rails while maintaining <1.0 µA leakage at 188 V nominal system voltage. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal lines (e.g., 4–20 mA loop or RS-485 bus), absorbing inductive switching transients before they reach precision ADCs or isolators. Use Value: 188 V VWM avoids false triggering during normal 24 V DC supply operation, while 600 W PPPM handles repetitive 10/1000 µs surges from nearby contactors. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding PoE-powered Ethernet switch ports and base station RF module DC inputs from lightning-induced surges on outdoor power feeds. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input rail, coordinated with upstream MOVs and downstream DC-DC converters to meet IEC 61000-4-5 Level 4 immunity. Use Value: 231 V VBR max ensures reliable turn-on before damage threshold of 50 V-rated DC-DC controllers, with 328 V VC limiting peak stress to safe margins. |
Use Scenario: Suppressing commutation spikes from universal motor brushes in washing machines and HVAC blowers connected to 120/230 V AC mains via rectifier bridges. IC Role / Device Role / Timing Role: Unidirectional TVS across bridge rectifier output or motor terminals, clamping flyback energy from inductive windings during PWM switching. Use Value: Glass-passivated junction ensures stable VBR over 10+ year service life; 150 °C TJ max supports sealed enclosure operation without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ188A | Same VWM (188 V), same SMB package, but not AEC-Q101 qualified; RθJA = 110 °C/W vs. 100 °C/W. | Approved for commercial/industrial use only; unsuitable for automotive PPAP or under-hood deployment. | Select when AEC-Q101 is not required and cost sensitivity outweighs thermal margin. |
| ON Semiconductor SMLJ188A | Identical VWM/VBR/PPPM specs and SMB package; AEC-Q101 qualified; halogen-free option available as SMLJ188AHM3. | Direct functional match with identical automotive qualification scope; differs only in branding and minor packaging codes. | Preferred for second-source assurance in automotive programs requiring dual-sourcing compliance. |
Compared with SMBJ188AHM3_A/I, SMAJ188A lacks automotive qualification and has higher thermal resistance, while SMLJ188AHM3 offers equivalent AEC-Q101 performance and sourcing flexibility - making it a validated alternative for Tier 1 automotive BOMs.
Availability
SMBJ188AHM3_A/I is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, telecom DC input surge suppression, and consumer appliance motor drive protection requiring stable component supply across production lifecycles.
Supply support for SMBJ188AHM3_A/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance, AEC-Q101 validation, and robust thermal behavior in compact SMB packages.
FAQ
What is the maximum clamping voltage of SMBJ188AHM3_A/I under rated surge conditions?
The SMBJ188AHM3_A/I exhibits a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 2.0 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88392, and defines the upper voltage limit imposed on protected circuitry during transient events. Maintaining this VC ensures downstream components like 3.3 V or 5 V microcontrollers remain within safe operating limits.
Is SMBJ188AHM3_A/I suitable for automotive applications?
Yes, SMBJ188AHM3_A/I is AEC-Q101 qualified, as confirmed in the "MECHANICAL DATA" section and ordering table footnote (1) of Vishay document 88392. The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - making SMBJ188AHM3_A/I appropriate for under-hood, body control, and powertrain modules where reliability under thermal cycling, vibration, and humidity is mandatory.
What does the "HM3" suffix signify in SMBJ188AHM3_A/I?
The "HM3" suffix in SMBJ188AHM3_A/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinct from "E3" (RoHS-compliant only) and "HE3" (RoHS + AEC-Q101, non-halogen-free). Per Vishay's ordering information table, HM3 parts meet JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards, confirming suitability for high-reliability automotive and industrial deployments.
How does SMBJ188AHM3_A/I compare to bidirectional TVS diodes like SMBJ188CA?
SMBJ188AHM3_A/I is unidirectional and features a cathode band marking, whereas SMBJ188CA is bidirectional with no polarity marking and symmetric clamping in both directions. The unidirectional SMBJ188AHM3_A/I provides lower forward voltage drop (VF ≤ 3.5 V at 50 A) and is preferred for DC power rail protection, while SMBJ188CA suits AC-coupled signal lines or differential buses where polarity reversal may occur.
What is the thermal resistance of SMBJ188AHM3_A/I, and how does it affect PCB layout?
SMBJ188AHM3_A/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, as specified in the "THERMAL CHARACTERISTICS" table. This value requires adequate copper area and optional thermal vias to maintain TJ ≤ 150 °C under sustained 5.0 W power dissipation - especially critical in enclosed automotive or industrial housings where ambient temperatures exceed 85 °C.
SMBJ188AHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ188AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ188AHM3_A/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_A/I reliable?
The price and inventory of SMBJ188AHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ188AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ188AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ188AHM3_A/I?
SMBJ188AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ188AHM3_A/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_A/I?
For technical support, including SMBJ188AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ188AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ188AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ188AHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ188AHM3_A/I?
All SMBJ188AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ188AHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ188AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ188AHM3_A/I Tags
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