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Vishay General Semiconductor - Diodes Division SMAJ188AHE3_A/I
- Part No.:
- SMAJ188AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188AHE3_A/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,680
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Product details
Overview
SMAJ188AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 A peak pulse current (IPPM), and clamps transients to ≤328 V at rated surge. It delivers 400 W peak pulse power (10/1000 μs waveform) and is AEC-Q101 qualified for automotive-grade reliability.
For engineers reviewing the SMAJ188AHE3_A/I datasheet, SMAJ188AHE3_A/I pinout, SMAJ188AHE3_A/I application, or SMAJ188AHE3_A/I equivalent, key selection criteria include its unidirectional polarity, 188 V operating threshold, low leakage (<1.0 μA at VWM), fast response time, and suitability for protecting MOSFETs, IC power rails, and sensor signal lines against inductive switching surges and ESD events.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (188 V) and rapidly transitions to low-impedance conduction above VBR (209–231 V), limiting transient voltages to ≤328 V at 328 A. Its glass-passivated junction ensures stable performance under repetitive surge stress and high-temperature operation up to TJ = 150 °C.
Designed for surface-mount placement on PCBs with 0.2" × 0.2" copper pads per terminal, it achieves thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. The SMA (DO-214AC) package supports automated assembly and meets UL 94 V-0 flammability rating with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 180–190 V DC rails. |
| VBR (min/max) | 209 V / 231 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPPM | ≤328 V at 328 A - Clamping voltage under full-rated 10/1000 μs surge; limits downstream voltage stress. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; derates to 300 W above 78 V per spec. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves system efficiency and prevents false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected circuit ground or low-side return path; enables standard unidirectional clamping topology. |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 188 V rail); marked by visible band; defines polarity-sensitive placement. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive load switching without degradation, validated per IEC 61000-4-5. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
| MSL Level 1 (J-STD-020) | Supports lead-free reflow soldering up to 260 °C peak without moisture-induced failure. |
| AEC-Q101 qualification | Confirms reliability for automotive applications including temperature cycling, HTRB, and surge endurance tests. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 180–190 V battery-fed subsystems (e.g., HVAC actuators, lighting drivers) from load dump and alternator surge. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between rail and chassis ground to shunt >100 V transients within nanoseconds. Use Value: Prevents latch-up or destruction of downstream PMICs and gate drivers by limiting peak voltage to ≤328 V during 12 V/24 V/48 V system surges. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs from EMI and relay coil kickback. IC Role / Device Role / Timing Role: Standoff-mode protector on 4–20 mA or 0–10 V signal paths, conducting only during overvoltage events. Use Value: Maintains sub-μA leakage to avoid measurement drift while clamping transients up to 328 A without affecting baseline accuracy. |
| MOSFET Gate Driver Protection | Telecom DC Power Input Stage |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gates driven from isolated DC-DC supplies in motor inverters. IC Role / Device Role / Timing Role: Fast-response clamp between gate and source, absorbing Miller-induced voltage spikes during switching transitions. Use Value: Eliminates risk of gate oxide rupture by holding gate-source voltage ≤328 V during dV/dt events exceeding 5 kV/μs. |
Use Scenario: Front-end surge suppression on -48 V telecom rectifier outputs feeding base station RF modules. IC Role / Device Role / Timing Role: Primary TVS on input bus, coordinated with upstream MOVs and downstream filtering to meet GR-1089-CORE Level 4. Use Value: Provides precise 188 V standoff to avoid nuisance tripping while delivering 400 W clamping for lightning-induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMAJ188A-M3/5A if halogen-free materials are required; otherwise SMAJ188AHE3_A/I offers same performance with standard RoHS compliance. |
| SMCJ188AHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher PPPM (1500 W) and IPPM (690 A). | Used where higher surge margin is needed (e.g., outdoor telecom cabinets), but requires larger PCB footprint and different pad layout. | Select SMAJ188AHE3_A/I for space-constrained designs needing 400 W protection; choose SMCJ188AHE3_A/I only when 1500 W capability is explicitly required. |
Compared with SMAJ188A-M3/5A, SMAJ188AHE3_A/I provides identical protection performance with standard RoHS compliance; versus SMCJ188AHE3_A/I, it trades surge headroom for compact SMA footprint-critical for dense automotive ECUs and portable industrial controllers.
Availability
SMAJ188AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor guarding, MOSFET gate driver safeguarding, and telecom DC input stage applications requiring stable component supply across production lifecycles.
Supply support for SMAJ188AHE3_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 and application-specific validation.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems-delivering precise clamping, AEC-Q101 qualification, and robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMAJ188AHE3_A/I under rated surge conditions?
The SMAJ188AHE3_A/I has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 328 A using the standardized 10/1000 μs waveform. This value is measured at TJ = 25 °C with devices mounted on 0.2" × 0.2" copper pads per terminal, ensuring realistic board-level performance for design validation.
Is the SMAJ188AHE3_A/I suitable for automotive applications?
Yes, the SMAJ188AHE3_A/I is AEC-Q101 qualified and specifically designed for automotive use. Its construction-including glass-passivated junction, MSL Level 1 rating, and operation up to +150 °C junction temperature-meets requirements for engine control, body electronics, and ADAS sensor protection. The HE3 suffix confirms AEC-Q101 qualification per Vishay's ordering nomenclature.
How does the SMAJ188AHE3_A/I differ from bidirectional variants like SMAJ188CA?
The SMAJ188AHE3_A/I is unidirectional, featuring a cathode band and conducting only in reverse bias above VBR, making it ideal for DC rail protection. In contrast, SMAJ188CA is bidirectional with no polarity marking and symmetrical clamping in both directions-used for AC lines or differential signal pairs. Their VWM, VBR, and VC values differ accordingly; SMAJ188AHE3_A/I is not interchangeable with SMAJ188CA without circuit redesign.
What is the thermal resistance of the SMAJ188AHE3_A/I, and how does it affect PCB layout?
The SMAJ188AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. To maintain safe operation under sustained power dissipation, PCB layout must use minimum recommended 0.2" × 0.2" copper pads per terminal. Reducing pad size or omitting thermal vias increases junction temperature and may trigger premature thermal shutdown or degradation.
Does the SMAJ188AHE3_A/I require external series impedance for optimal protection?
No, the SMAJ188AHE3_A/I functions as a standalone clamping device and does not require external series impedance for basic transient suppression. However, in high-speed signal lines or systems subject to repetitive surges, adding a small series resistor (e.g., 1–10 Ω) or ferrite bead can reduce ringing and improve energy distribution-this is a system-level design choice, not a requirement for SMAJ188AHE3_A/I functionality.
SMAJ188AHE3_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:
- 300W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ188AHE3_A/I FAQ
1.How can I place an order for SMAJ188AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188AHE3_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 SMAJ188AHE3_A/I reliable?
The price and inventory of SMAJ188AHE3_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 SMAJ188AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ188AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188AHE3_A/I?
SMAJ188AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188AHE3_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 SMAJ188AHE3_A/I?
For technical support, including SMAJ188AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ188AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ188AHE3_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 SMAJ188AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ188AHE3_A/I?
All SMAJ188AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188AHE3_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 SMAJ188AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ188AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188AHE3_A/I Tags
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