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Vishay General Semiconductor - Diodes Division SMAJ188AHM3_A/I
- Part No.:
- SMAJ188AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHM3_A/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,041
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Product details
Overview
SMAJ188AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 328 V at 0.91 A peak pulse current, with 188 V stand-off voltage and 400 W peak pulse power (10/1000 μs), used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and automotive ECUs.
For engineers reviewing the SMAJ188AHM3_A/I datasheet, SMAJ188AHM3_A/I pinout, SMAJ188AHM3_A/I application, or SMAJ188AHM3_A/I equivalent, this part delivers verified clamping performance under repetitive surge conditions, meets AEC-Q101 qualification, supports automated SMT placement, and provides halogen-free RoHS compliance with MSL Level 1 rating.
Technical Context
This TVS diode operates as a unidirectional clamp with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its 188 V stand-off voltage ensures compatibility with 150–175 V DC bus systems while maintaining <1.0 μA reverse leakage at rated VWM.
The device sustains 400 W peak pulse power per 10/1000 μs waveform up to 25 °C ambient, derating linearly above TA = 25 °C with RθJA = 120 °C/W, and achieves 328 V clamping voltage at IPPM = 0.91 A - critical for safeguarding high-voltage gate drivers and CAN transceivers against load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 188 V - maximum continuous reverse operating voltage before clamping initiates; sets operating margin for 150 V nominal systems. |
| Breakdown Voltage (VBR) | 209–231 V at 1 mA - guaranteed conduction onset range; ensures reliable triggering above system overvoltage thresholds. |
| Clamping Voltage (VC) | 328 V at IPPM = 0.91 A - peak voltage seen by protected circuit during worst-case transient; defines absolute stress limit for downstream components. |
| Peak Pulse Power (PPPM) | 400 W (10/1000 μs) - energy-handling capability for standard lightning/surge waveforms; derates to 300 W above 78 V per spec. |
| Operating Temperature | -55 °C to +150 °C - full junction temperature range enabling use in under-hood automotive and industrial motor drive environments. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement for 3.3 W steady-state dissipation. |
| AEC-Q101 Qualified | Yes - qualified for automotive applications per JESD22-A108; supports use in ECU, body control, and ADAS subsystems without additional qualification. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt surge current away from protected node. |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 150 V rail); reverse breakdown at VBR diverts transient energy to ground when voltage exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - required for automotive Tier 1 supply chain compliance. |
| 400 W peak pulse power | Validated at 10/1000 μs waveform with 0.01% duty cycle - sufficient for ISO 7637-2 Pulse 5a load dump suppression in 24 V systems. |
| Low clamping ratio (VC/VBR) | 328 V / 209 V ≈ 1.57 - tight ratio minimizes overvoltage overshoot during fast transients, protecting sensitive gate oxides. |
| Fast response time | <1.0 ps intrinsic junction response - enables clamping before induced transients propagate into IC inputs or power stages. |
| Automated placement compatible | Standard SMA footprint with defined tape-and-reel packaging (7" or 13" reels) - supports high-volume SMT line integration without manual handling. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of IGBT gate driver outputs against inductive kickback from contactor coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate and source to clamp negative-going spikes below -20 V and positive surges above 188 V. Use Value: Prevents gate oxide rupture in 600 V IGBTs by limiting transient voltage to ≤328 V, extending reliability in 48 V DC bus systems. |
Use Scenario: Safeguarding LIN bus transceiver power pins from battery voltage transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VCC and GND to clamp surges exceeding 188 V while leaking <1 μA at 15 V nominal. Use Value: Maintains LIN communication integrity by suppressing 100 V/10 ms pulses to ≤328 V, meeting ISO 16750-2 requirements. |
| Telecom Power Rectifiers | Renewable Energy Inverters |
|
Use Scenario: Secondary-side overvoltage protection on 48 V telecom rectifier outputs exposed to lightning-induced surges on AC input lines. IC Role / Device Role / Timing Role: Unidirectional clamp across output capacitor to absorb 400 W transients without thermal runaway. Use Value: Enables single-stage protection architecture by handling 0.91 A peak current at 328 V clamping, eliminating need for cascaded MOV+TVS designs. |
Use Scenario: DC-link overvoltage suppression in solar string inverters where PV array open-circuit voltage reaches 1500 V, but auxiliary rails operate at 188 V. IC Role / Device Role / Timing Role: Standoff-rated TVS on 188 V auxiliary supply rail to protect monitoring ICs and gate drivers during grid fault recovery. Use Value: Guarantees 150 °C junction operation under repeated 10/1000 μs surges, supporting 25-year field life in outdoor photovoltaic installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188AHE3_A/I | Same electrical specs, RoHS-compliant but not halogen-free; uses standard SnPb-free plating without halogen restriction. | Acceptable for commercial/industrial use where halogen-free certification is not mandated (e.g., non-automotive BOMs). | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMAJ188A-M3/5A | Identical electrical parameters and halogen-free construction, but packaged in 13" reel (7500 pcs) vs. I-code's 13" reel with AEC-Q101 traceability. | Lacks AEC-Q101 qualification documentation and lot-level automotive traceability; suitable for non-automotive volume production. | Choose for high-volume consumer or industrial programs requiring halogen-free material but no automotive qualification. |
Compared with SMAJ188AHM3_A/I, SMAJ188AHE3_A/I omits halogen-free assurance and automotive qualification, while SMAJ188A-M3/5A provides identical materials without AEC-Q101 test records - making SMAJ188AHM3_A/I the only option fully aligned with Tier 1 automotive sourcing mandates.
Availability
SMAJ188AHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom rectifiers, and renewable energy inverters requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ188AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMAJ series targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom applications demanding AEC-Q101 compliance and robust 10/1000 μs surge handling.
FAQ
What is the clamping voltage of SMAJ188AHM3_A/I at its rated peak pulse current?
The SMAJ188AHM3_A/I has a maximum clamping voltage (VC) of 328 V at its peak pulse current (IPPM) of 0.91 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ188AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMAJ188AHM3_A/I qualified for automotive applications?
Yes, SMAJ188AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's ordering information table (page 3, datasheet 88390). It undergoes stress testing per JESD22-A108 and supports automotive use cases including body control modules and engine control units. The SMAJ188AHM3_A/I also meets MSL Level 1 reflow requirements for lead-free assembly.
What does the "HM3" suffix indicate in SMAJ188AHM3_A/I?
The "HM3" suffix in SMAJ188AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, not halogen-free) variants. This makes SMAJ188AHM3_A/I compliant with automotive Tier 1 material declarations and environmental regulations such as IEC 61249-2-21. The SMAJ188AHM3_A/I is supplied in 13" tape-and-reel format with full lot traceability.
How does SMAJ188AHM3_A/I differ from SMAJ188A-M3/5A?
SMAJ188AHM3_A/I and SMAJ188A-M3/5A share identical electrical specifications and halogen-free materials, but SMAJ188AHM3_A/I includes full AEC-Q101 qualification documentation and automotive-grade traceability, whereas SMAJ188A-M3/5A lacks formal automotive certification records. Both use the same SMA (DO-214AC) package, but SMAJ188AHM3_A/I is designated for automotive programs requiring certified lots. The SMAJ188AHM3_A/I is the preferred choice when automotive compliance is mandatory.
What is the thermal resistance of SMAJ188AHM3_A/I from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ188AHM3_A/I is 120 °C/W, measured on a 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal, as specified in the Thermal Characteristics table (page 3, datasheet 88390). This value governs steady-state power dissipation limits and must be applied when calculating junction temperature rise under continuous leakage or bias conditions. The SMAJ188AHM3_A/I also features RθJL = 30 °C/W for lead-to-junction conduction paths.
SMAJ188AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 910mA
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ188AHM3_A/I FAQ
1.How can I place an order for SMAJ188AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHM3_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 SMAJ188AHM3_A/I reliable?
The price and inventory of SMAJ188AHM3_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 SMAJ188AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ188AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHM3_A/I?
SMAJ188AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHM3_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 SMAJ188AHM3_A/I?
For technical support, including SMAJ188AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ188AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHM3_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 SMAJ188AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ188AHM3_A/I?
All SMAJ188AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHM3_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 SMAJ188AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ188AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188AHM3_A/I Tags
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