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Vishay General Semiconductor - Diodes Division SMAJ188AHM3_A/H
- Part No.:
- SMAJ188AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHM3_A/H.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ188AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection with 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR), and 328 A peak pulse current (IPPM) under 10/1000 μs waveform. It delivers 400 W peak pulse power (derated to 300 W above 78 V), operates from −55 °C to +150 °C, and is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive-grade reliability.
For engineers reviewing the SMAJ188AHM3_A/H datasheet, SMAJ188AHM3_A/H pinout, SMAJ188AHM3_A/H application, or SMAJ188AHM3_A/H equivalent, this device is selected for robust overvoltage clamping in DC power rails, automotive sensor interfaces, and industrial I/O lines where fast response (<1 ns), low clamping voltage (328 V at IPPM), and stable thermal performance (RθJA = 120 °C/W) are critical.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for transient suppression in unidirectional configurations, with cathode band marking for polarity identification. Its clamping behavior is defined by a low incremental surge resistance and tight VBR tolerance (±5% typical), enabling predictable voltage limiting during ESD or lightning-induced surges.
The device meets J-STD-020 MSL Level 1 moisture sensitivity and supports reflow soldering up to 260 °C peak. Its 0.064 g unit weight and DO-214AC footprint enable automated placement on PCBs with minimal board space, while the matte tin-plated leads ensure solderability per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V/48 V/110 V systems. |
| VBR (min/max) | 209 V / 231 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across temperature and lot variation. |
| IPPM | 328 A - Peak surge current it withstands under 10/1000 μs waveform; determines protection level against IEC 61000-4-5 Level 4 surges. |
| VC @ IPPM | 328 V - Clamped voltage during max-rated surge; directly limits downstream IC stress and defines required safety margin. |
| PPPM | 400 W - Peak pulse power handling (300 W above 78 V); enables compact protection without external heatsinking on standard pads. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive or industrial enclosures without derating. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on 0.2" × 0.2" copper pads; informs layout cooling requirements for repetitive surge duty. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), 0.064 g weight, UL 94 V-0 compliant molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge events (IFSM = 40 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 188 V rail); initiates avalanche breakdown when VIN exceeds VWM, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring zero-failure reliability. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance mandates without compromising surge performance or thermal stability. |
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection for high-energy transients in industrial power supplies and telecom DC feeds. |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.45 ensure minimal overvoltage overshoot during fast-rising surges. |
| MSL Level 1, 260 °C reflow compatible | Supports standard SMT assembly without pre-baking or special handling, reducing manufacturing cost and risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V/48 V battery-fed ECUs and body control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power input and local regulator input. Use Value: Limits transient voltage to ≤328 V during 100 V/500 ms load dump events, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Line-side surge suppressor on 4–20 mA or 0–10 V signal paths exposed to field wiring noise. Use Value: Clamps induced surges from relay switching or motor drive coupling to <328 V, preserving ADC accuracy and isolator integrity. |
| Telecom DC Power Feeds | Renewable Energy Inverter Control |
Use Scenario: Overvoltage protection on −48 V DC distribution in central office and remote radio head equipment. IC Role / Device Role / Timing Role: Primary TVS on input stage of DC/DC converters powering baseband processors. Use Value: Withstands repeated 10/1000 μs surges up to 328 A while maintaining VWM = 188 V, ensuring uptime during lightning-induced grid disturbances. |
Use Scenario: Surge suppression on gate driver supply rails in solar string inverters subject to rapid PV array voltage transients. IC Role / Device Role / Timing Role: Clamp diode on isolated 15 V gate bias rail feeding SiC MOSFET drivers. Use Value: Fast clamping prevents gate oxide overstress during dV/dt spikes, extending power device lifetime in high-frequency switching environments. |
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/H | Same electrical specs and package, but RoHS-compliant commercial grade (non-halogen-free, no AEC-Q101 qualification). | Lacks automotive qualification and halogen-free certification; suitable for non-automotive industrial or telecom use. | Select when AEC-Q101 and halogen-free requirements are not mandated, prioritizing cost or legacy BOM alignment. |
| SMBJ188A-HM3_A/H | Same VWM/VBR/IPPM, but SMB (DO-214AA) package - 20 % larger footprint and higher RθJA (100 °C/W vs. 120 °C/W). | Offers higher surge margin due to larger junction area; preferred where board space allows and thermal derating is critical. | Choose when higher long-term surge endurance or improved thermal margin is needed, accepting larger PCB area. |
Compared with SMAJ188AHM3_A/H, the HE3 variant trades halogen-free and automotive qualification for broader commercial acceptance, while the SMBJ188A-HM3_A/H provides enhanced thermal robustness and surge margin at the cost of footprint size - making SMAJ188AHM3_A/H optimal for space-constrained, AEC-Q101–required automotive and industrial designs.
Availability
SMAJ188AHM3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ188AHM3_A/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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where precise clamping, AEC-Q101 validation, and surface-mount manufacturability are essential.
FAQ
What is the maximum clamping voltage of the SMAJ188AHM3_A/H under rated surge conditions?
The SMAJ188AHM3_A/H has a maximum clamping voltage (VC) of 328 V at its rated peak pulse current (IPPM = 328 A) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events, ensuring downstream components remain within safe operating voltage ranges.
Is SMAJ188AHM3_A/H suitable for automotive applications?
Yes, SMAJ188AHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It is validated for under-hood and chassis-mounted applications such as battery management systems, ADAS sensor power rails, and body control modules where reliability under thermal cycling and high-energy transients is mandatory.
How does the SMAJ188AHM3_A/H differ from the SMAJ188A-E3/61 variant?
The SMAJ188AHM3_A/H differs from SMAJ188A-E3/61 in three key aspects: it uses halogen-free molding compound (HM3 vs. E3), carries AEC-Q101 qualification (not present in E3), and ships in 7" tape-and-reel with package code H. Electrically and dimensionally identical, SMAJ188AHM3_A/H meets stricter environmental and automotive reliability standards, whereas E3 is commercial-grade only.
What is the thermal resistance and how does it affect PCB layout for SMAJ188AHM3_A/H?
SMAJ188AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimum recommended pad layout; reducing pad area increases thermal impedance and may require derating peak power during repetitive surges. Layout must maintain full copper exposure under both terminals and avoid thermal isolation to sustain 400 W pulse capability.
Can SMAJ188AHM3_A/H be used in bidirectional configurations?
No, SMAJ188AHM3_A/H is a unidirectional TVS diode, indicated by the "A" suffix (vs. "CA" for bidirectional). Its cathode band marking and asymmetric I-V curve mean it conducts only in reverse avalanche mode and forward surge mode (IFSM = 40 A), but does not suppress positive-going transients on grounded lines. For bidirectional protection, use SMAJ188CA-HM3_A/H instead.
SMAJ188AHM3_A/H 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/H FAQ
1.How can I place an order for SMAJ188AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHM3_A/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 SMAJ188AHM3_A/H reliable?
The price and inventory of SMAJ188AHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ188AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHM3_A/H?
SMAJ188AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHM3_A/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 SMAJ188AHM3_A/H?
For technical support, including SMAJ188AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ188AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHM3_A/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 SMAJ188AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ188AHM3_A/H?
All SMAJ188AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHM3_A/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 SMAJ188AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ188AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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