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Vishay General Semiconductor - Diodes Division SMAJ188AHM3/I
- Part No.:
- SMAJ188AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHM3/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,025
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Product details
Overview
SMAJ188AHM3/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 waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive electronics.
For engineers reviewing the SMAJ188AHM3/I datasheet, SMAJ188AHM3/I pinout, SMAJ188AHM3/I application, or SMAJ188AHM3/I equivalent, this part delivers verified transient suppression for 188 V DC systems, meets AEC-Q101 qualification (HM3 suffix), supports automated SMT placement, and requires no derating below 78 V for full 400 W rating.
Technical Context
This TVS diode operates as a unidirectional clamping device with a cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown behavior and low incremental surge resistance. Its thermal resistance (RθJA = 120 °C/W) and maximum junction temperature of 150 °C enable reliable operation on standard 5.0 mm × 5.0 mm copper pads without forced cooling.
The SMAJ188AHM3/I exhibits a breakdown voltage range of 209–231 V at 1 mA test current, clamps to ≤328 V at 0.91 A IPPM, and maintains <1.0 μA reverse leakage at 188 V stand-off - critical for low-power sensor interfaces where leakage-induced offset must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 188 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin for 188 V DC bus protection. |
| Breakdown Voltage (VBR) | 209–231 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably under transient stress. |
| Clamping Voltage (VC) | ≤328 V at 0.91 A - Peak voltage seen by protected circuit during 10/1000 μs surge; ensures downstream ICs rated for <350 V survive. |
| Peak Pulse Power (PPPM) | 400 W (10/1000 μs) - Sustains single high-energy transients common in inductive switching (e.g., solenoid drivers, motor controllers). |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC MS-013. |
| AEC-Q101 Qualified | Yes (HM3 suffix) - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC specification. |
| Thermal Resistance (RθJA) | 120 °C/W - Enables thermal design on minimal PCB copper; junction rise ≈ 108 °C at 3.3 W steady-state dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VWM + dynamic margin. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (≤78 V) | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 188 V DC rails without external series impedance. |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5 % typical) and long-term parameter stability across 1000+ surge cycles. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns; eliminates pre-bake requirement in standard SMT lines. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills automotive and industrial environmental compliance mandates without compromising surge performance or thermal capability. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive analog front-ends. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting microcontroller GPIOs and level-shifters connected to 24 V/188 V battery-sensed lines exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input trace and chassis ground, conducting only during positive overvoltage events. Use Value: Limits voltage to ≤328 V during 100 ms load-dump pulses, preventing latch-up or gate oxide rupture in 3.3 V/5 V interface ICs downstream. |
Use Scenario: Shielding optocoupler inputs and isolation amplifiers on 188 V DC fieldbus nodes from switching noise and EFT bursts. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted directly at connector entry point, shunting energy before it reaches signal conditioning stage. Use Value: Maintains <1.0 μA leakage at 188 V, avoiding false triggering or offset drift in high-impedance analog sensing paths. |
| Telecom Power Supply Monitoring | EV Battery Management System |
|
Use Scenario: Safeguarding voltage-monitoring ADC inputs in -48 V or +188 V telecom rectifier modules against lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS placed upstream of precision reference dividers and protection FETs. Use Value: Clamps 10/1000 μs surges within 1 ns, preserving integrity of 16-bit ADC measurements during transient events. |
Use Scenario: Guarding cell-voltage monitoring ICs in high-voltage battery packs (e.g., 188 V nominal pack) against inrush and contactor bounce transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each cell-string sense line, referenced to local ground plane with minimal trace inductance. Use Value: AEC-Q101 qualification ensures operational reliability across -40 °C to +125 °C ambient, matching BMS thermal envelope requirements. |
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/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, and PPPM. | Approved for commercial/industrial use only; unsuitable for automotive production or harsh-environment deployments. | Select when cost sensitivity outweighs automotive qualification and halogen-free requirements. |
| SMBJ188A-HM3 | SMB package (DO-214AA); 600 W PPPM; identical VWM/VBR specs but larger footprint and higher thermal mass. | Better suited for higher-duty-cycle surge environments; requires PCB layout change due to 3.56 mm vs. 4.50 mm width. | Choose when system-level surge testing exceeds 400 W single-pulse limits or thermal derating margins are tight. |
Compared with SMAJ188AHM3/I, SMAJ188AHE3/I trades automotive qualification for lower cost, while SMBJ188A-HM3 increases surge capacity at the expense of board space - making SMAJ188AHM3/I optimal for space-constrained, AEC-Q101–mandated 188 V protection.
Availability
SMAJ188AHM3/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, telecom power monitoring, and EV battery management systems requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ188AHM3/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, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure, delivering standardized TVS performance in compact surface-mount packages with rigorous qualification and thermal design support.
FAQ
What is the maximum clamping voltage of the SMAJ188AHM3/I under a 10/1000 μs surge?
The SMAJ188AHM3/I clamps to a maximum of 328 V at its rated peak pulse current of 0.91 A under a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and reflects worst-case voltage seen by downstream circuitry during standardized surge events. The SMAJ188AHM3/I maintains this clamping performance across its qualified temperature range of –55 °C to +150 °C.
Does the SMAJ188AHM3/I meet AEC-Q101 requirements for automotive use?
Yes, the SMAJ188AHM3/I is fully AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. It has passed stress tests including temperature cycling, high-temperature operating life, and mechanical shock per AEC-Q101 Rev D. This makes the SMAJ188AHM3/I suitable for under-hood and chassis-mounted applications where reliability under thermal and vibration stress is mandatory.
How does the SMAJ188AHM3/I differ from the SMAJ188A-E3/I variant?
The SMAJ188AHM3/I is halogen-free and AEC-Q101 qualified, whereas the SMAJ188A-E3/I is RoHS-compliant but not halogen-free and lacks automotive qualification. Both share identical electrical specifications (VWM = 188 V, VBR = 209–231 V, PPPM = 400 W), but only the SMAJ188AHM3/I is approved for production automotive systems requiring halogen-free materials and extended reliability validation.
What is the reverse leakage current of the SMAJ188AHM3/I at its rated stand-off voltage?
At its 188 V stand-off voltage (VWM) and 25 °C ambient, the SMAJ188AHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage ensures minimal loading on high-impedance sensor signal paths and prevents measurement errors in precision analog monitoring circuits powered from the same 188 V rail protected by the SMAJ188AHM3/I.
Can the SMAJ188AHM3/I be used in bidirectional transient protection applications?
No - the SMAJ188AHM3/I is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional protection at 188 V, the correct variant is SMAJ188CA-HM3/I. Using SMAJ188AHM3/I in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to suppress the surge.
SMAJ188AHM3/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:
- 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):
- 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/I FAQ
1.How can I place an order for SMAJ188AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHM3/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/I reliable?
The price and inventory of SMAJ188AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ188AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHM3/I?
SMAJ188AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHM3/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/I?
For technical support, including SMAJ188AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHM3/I requirements.
6.How does Aetrix verify that SMAJ188AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ188AHM3/I?
All SMAJ188AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ188AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188AHM3/I Tags
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