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Vishay General Semiconductor - Diodes Division SMAJ188CA-E3/61
- Part No.:
- SMAJ188CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CA-E3/61.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,626
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Product details
Overview
SMAJ188CA-E3/61 from Vishay General Semiconductor is a bidirectional 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 400 W peak pulse power (10/1000 μs), 188 V stand-off voltage, and ±209–231 V breakdown voltage range. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMAJ188CA-E3/61 datasheet, SMAJ188CA-E3/61 pinout, SMAJ188CA-E3/61 application, or SMAJ188CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 188 V working voltage, 328 V max clamping voltage at rated surge, AEC-Q101 qualification eligibility (via HE3 suffix), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device across two terminals, responding within <1 ps to transient overvoltages by entering avalanche conduction when reverse voltage exceeds its breakdown range (209–231 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity marking on the SMA package.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 188 V - Maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 209–231 V at 1 mA test current - Confirmed avalanche onset range for reliable clamping threshold |
| Max Clamping Voltage (VC) | 328 V at 0.91 A peak pulse - Measured clamping limit under standardized 10/1000 μs surge waveform |
| Peak Pulse Power (PPPM) | 400 W (≤78 V); 300 W (>78 V) - Surge energy handling capacity per JEDEC-standard waveform |
| Reverse Leakage (ID) | 1.0 μA at 188 V - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Junction Temperature Range | –55 °C to +150 °C - Enables operation in under-hood automotive, industrial control, and outdoor telecom environments |
| Package | SMA (DO-214AC) - Surface-mount outline with 0.208" × 0.157" footprint, compatible with standard SMT pick-and-place and reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; no cathode band marking - enables orientation-agnostic PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Robust surge immunity for IEC 61000-4-5 Level 3/4 compliance in industrial and automotive interfaces |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for downstream ICs |
| Glass passivated chip junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity stress |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification option | Enables use in automotive powertrain and body electronics where component-level stress testing is mandated |
Applications
| Automotive Sensor Signal Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector interface or IC input pins. Use Value: Limits transient voltage to ≤328 V while maintaining 188 V system operating margin, preventing latch-up or gate oxide damage in 5 V–24 V sensor front-ends. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels before optocoupler or MCU GPIO. Use Value: Absorbs 400 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5, extending field service life. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD/Transient Suppression |
Use Scenario: Shielding Ethernet PHYs, PoE injectors, and DSL line drivers from lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: First-stage transient suppressor in series with gas discharge tube (GDT) or polymer PTC for hybrid protection. Use Value: Fast sub-nanosecond response complements slower GDTs, clamping initial surge edge before secondary protection activates. |
Use Scenario: Suppressing ESD and switching transients on AC-DC adapter output rails feeding USB-C PD controllers or PMICs. IC Role / Device Role / Timing Role: Secondary-side TVS across 12 V or 19 V output, after primary-side filtering. Use Value: 1.0 μA leakage at 188 V prevents quiescent current drain in always-on standby circuits while clamping to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-E3/61 | Unidirectional variant; includes cathode band marking; same VWM, VBR, VC, and PPPM | Requires polarity-aware layout; suitable only where circuit topology mandates unidirectional clamping (e.g., DC-biased lines) | Select SMAJ188A-E3/61 only if system ground reference or biasing enforces strict polarity - otherwise SMAJ188CA-E3/61 offers layout flexibility |
| SMBJ188CA-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 1.5× higher thermal mass; RθJA = 80 °C/W vs. 120 °C/W | Better thermal dissipation for high-duty-cycle surge environments; requires larger PCB footprint (0.256" × 0.157") | Choose SMBJ188CA-E3/52 when ambient temperature exceeds 85 °C or surge repetition rate exceeds 0.01 % duty cycle - otherwise SMAJ188CA-E3/61 optimizes space-constrained designs |
Compared with SMAJ188A-E3/61, SMAJ188CA-E3/61 eliminates polarity constraints for simplified layout and reduces risk of misorientation; compared with SMBJ188CA-E3/52, it trades thermal headroom for 30 % smaller footprint - making it optimal for compact automotive modules and dense industrial PCBs where surge duty cycle remains low.
Availability
SMAJ188CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer power adapter designs requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.
Supply support for SMAJ188CA-E3/61 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series delivers surface-mount transient voltage suppression for high-reliability applications, engineered specifically for robustness against repetitive surges in harsh environments including automotive, industrial automation, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of SMAJ188CA-E3/61 under standard test conditions?
The SMAJ188CA-E3/61 has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current of 0.91 A using the 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMAJ188CA-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ188CA-E3/61 itself is the commercial-grade RoHS-compliant variant; however, Vishay offers AEC-Q101 qualified versions under ordering codes such as SMAJ188CAHE3_A/H. For automotive use, specify the HE3 or HM3 suffix to obtain the tested and certified version - SMAJ188CA-E3/61 must be replaced with SMAJ188CAHE3_A/H to meet AEC-Q101 requirements.
How does the bidirectional design of SMAJ188CA-E3/61 affect PCB layout compared to unidirectional variants?
The SMAJ188CA-E3/61 has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during automated placement. Unlike unidirectional SMAJ188A-E3/61 (which requires cathode-band alignment), SMAJ188CA-E3/61 eliminates orientation verification steps, reduces placement error risk, and simplifies layout in AC-coupled or floating signal paths such as telecom line interfaces or differential sensor outputs.
What is the thermal resistance and power derating behavior of SMAJ188CA-E3/61 above 25 °C ambient?
SMAJ188CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads. Its peak pulse power rating derates linearly above 25 °C ambient - for example, at 85 °C ambient, usable PPPM drops to ~65 % of 400 W. Full derating curves are provided in Figure 2 of Vishay document 88390.
Can SMAJ188CA-E3/61 be used in parallel to increase surge current handling?
No - SMAJ188CA-E3/61 should not be paralleled due to manufacturing variations in breakdown voltage (209–231 V range), which cause uneven current sharing and potential thermal runaway. For higher surge capability, select a single higher-rated device (e.g., SMBJ188CA-E3/52) or implement staged protection with upstream current-limiting elements.
SMAJ188CA-E3/61 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:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ188CA-E3/61 FAQ
1.How can I place an order for SMAJ188CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CA-E3/61 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 SMAJ188CA-E3/61 reliable?
The price and inventory of SMAJ188CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ188CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CA-E3/61?
SMAJ188CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CA-E3/61 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 SMAJ188CA-E3/61?
For technical support, including SMAJ188CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ188CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ188CA-E3/61 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 SMAJ188CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ188CA-E3/61?
All SMAJ188CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CA-E3/61, 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 SMAJ188CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ188CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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