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Vishay General Semiconductor - Diodes Division SMAJ188CA-M3/61
- Part No.:
- SMAJ188CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188CA-M3/61.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,103
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Product details
Overview
SMAJ188CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR) at 1 mA, 328 V maximum clamping voltage (VC) at 0.91 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - optimized for automotive and industrial electronics exposed to lightning or inductive switching transients.
For engineers reviewing the SMAJ188CA-M3/61 datasheet, SMAJ188CA-M3/61 pinout, SMAJ188CA-M3/61 application, or SMAJ188CA-M3/61 equivalent, this device delivers verified bidirectional clamping performance, AEC-Q101 qualification readiness (via HM3 suffix), low thermal resistance (RθJL = 30 °C/W), and halogen-free RoHS compliance - critical for high-reliability board-level surge protection design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream ICs or MOSFETs. Its bidirectional symmetry ensures identical clamping behavior for positive and negative transients without polarity dependency.
Engineered for fast response (<1 ps typical), low incremental surge resistance, and stable operation from –55 °C to +150 °C junction temperature, SMAJ188CA-M3/61 maintains consistent clamping under repetitive surges (0.01% duty cycle) and meets MSL Level 1 reflow requirements (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC/AC working margin. |
| VBR (min/max) | 209 V / 231 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 328 V at 0.91 A - Measured clamping voltage during 10/1000 μs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads; supports IEC 61000-4-5 Level 3/4 immunity. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental DC fault events. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; enables accurate PCB thermal design for sustained power dissipation up to 3.3 W. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial control environments. |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and J-STD-002/JESD 22-B102 solderability compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for symmetrical clamping; connects to protected line or ground reference depending on layout topology. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode in CA devices; no polarity marking required; both terminals function identically under ± transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance for positive and negative transients - eliminates need for dual-device placement or polarity-aware routing. |
| 400 W peak pulse power | Validated at 10/1000 μs waveform on standard 5.0 mm × 5.0 mm copper pads - meets IEC 61000-4-5 surge immunity requirements for industrial and automotive applications. |
| AEC-Q101 ready (HM3 suffix) | Halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance and MSL Level 1 reflow capability - supports automotive qualification path without redesign. |
| Low clamping ratio (VC/VBR ≈ 1.57) | 328 V clamping at 209 V min breakdown - minimizes overvoltage overshoot during surge events, protecting sensitive 175 V-rated MOSFETs and gate drivers. |
| Fast response time (<1 ps) | Enables suppression of nanosecond-scale ESD and fast-rising inductive spikes before protected components experience destructive voltage stress. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in engine control units (ECUs) and body control modules (BCMs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching LDOs, microcontrollers, and CAN transceivers. Use Value: Withstands 400 W surges while limiting clamped voltage to ≤328 V - ensuring compliance with ISO 16750-2 Category 5a/b and preventing latch-up in downstream 3.3 V/5 V logic. |
Use Scenario: Safeguarding analog input channels of industrial PLC analog I/O modules connected to 4–20 mA current loops or thermocouple sensors. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential sensor inputs to suppress common-mode transients induced by nearby motor drives or relay switching. Use Value: Symmetrical clamping prevents signal inversion or offset shift during ±1 kV EFT bursts; low leakage (<1 μA at 188 V) avoids measurement drift in precision 24-bit ADC front-ends. |
| Telecom Power Feeding Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Securing PoE (Power over Ethernet) midspan injectors and PSE controllers against induced surges on 48 V DC power pairs. IC Role / Device Role / Timing Role: Primary-line TVS on each power pair (spare pairs or data pairs) to absorb longitudinal surges without disrupting IEEE 802.3af/at signaling integrity. Use Value: 188 V VWM provides 20% margin above 48 V nominal + 100 V ripple; 328 V VC stays below 400 V isolation barrier limits of Ethernet magnetics and PHY ICs. |
Use Scenario: Shielding BLDC motor driver ICs and gate drivers in smart home appliances (e.g., washing machines, HVAC fans) from back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Localized TVS across half-bridge outputs and bootstrap supplies to clamp inductive kickback before damaging high-side gate drivers or bootstrap diodes. Use Value: Fast <1 ps response captures sub-microsecond spikes; 40 A IFSM rating tolerates repeated motor stall conditions without degradation - extending field reliability beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-M3/61 | Unidirectional variant; cathode-marked; 328 V VC applies only to reverse polarity surges. | Requires correct polarity orientation; unsuitable for AC-coupled or floating signal lines where bidirectional protection is mandatory. | Select only if protecting unidirectional DC rails with known polarity and space-constrained layouts where single-direction clamping suffices. |
| SMCJ188CA | Larger SMC (DO-214AB) package; 1500 W PPPM; same VWM/VBR but higher IPPM (2.5 A) and VC (354 V). | Higher surge capacity suits mains-connected equipment; larger footprint incompatible with dense automotive PCBs. | Choose when system-level surge tests exceed 400 W (e.g., IEC 61000-4-5 Level 4) and board area allows SMC footprint. |
Compared with SMAJ188A-M3/61, SMAJ188CA-M3/61 eliminates polarity dependency and simplifies layout; compared with SMCJ188CA, it trades surge headroom for compactness and automated assembly compatibility - making SMAJ188CA-M3/61 optimal for space-limited, bidirectionally stressed automotive and industrial PCBs.
Availability
SMAJ188CA-M3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog I/O modules, telecom PoE injectors, and consumer appliance motor drives requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMAJ188CA-M3/61 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMAJ series is engineered specifically for board-level transient suppression in harsh environments - delivering standardized TVS performance in compact surface-mount packages with automotive-grade process controls and qualification pathways.
FAQ
What is the maximum clamping voltage of SMAJ188CA-M3/61 under a 10/1000 μs surge?
The maximum clamping voltage (VC) of SMAJ188CA-M3/61 is 328 V when subjected to its rated peak pulse current of 0.91 A using the standard 10/1000 μs waveform. This value is measured across the device terminals with specified PCB pad layout (0.2" × 0.2" copper) and represents the upper voltage limit imposed on protected circuitry during surge events - a key parameter for verifying compatibility with downstream component voltage ratings in designs using SMAJ188CA-M3/61.
Is SMAJ188CA-M3/61 suitable for automotive applications?
Yes, SMAJ188CA-M3/61 is halogen-free and RoHS-compliant per its M3 suffix, and belongs to the AEC-Q101-qualified SMAJ family - with the HM3 variant explicitly certified. While SMAJ188CA-M3/61 itself is commercial-grade, its construction (matte tin leads, MSL Level 1, JESD201 Class 2 whisker resistance) and electrical specs (TJ max = +150 °C, 400 W surge rating) align with automotive subsystem requirements such as body electronics and infotainment power rails - enabling qualification-ready design-in for SMAJ188CA-M3/61.
How does the bidirectional design of SMAJ188CA-M3/61 affect PCB layout?
The bidirectional design of SMAJ188CA-M3/61 eliminates polarity constraints: no cathode band marking is present, and both terminals perform identically under positive or negative transients. This allows symmetric placement across differential lines, AC-coupled interfaces, or floating grounds without orientation checks - reducing assembly errors and enabling simplified routing in tight spaces. Unlike unidirectional variants such as SMAJ188A-M3/61, SMAJ188CA-M3/61 requires no silkscreen polarity indicator or automated optical inspection (AOI) alignment step during SMT placement.
What is the thermal resistance from junction to lead (RθJL) for SMAJ188CA-M3/61?
The junction-to-lead thermal resistance (RθJL) of SMAJ188CA-M3/61 is 30 °C/W, measured under standard test conditions. This parameter quantifies how effectively heat generated during surge conduction transfers from the silicon die to the PCB copper via the leads - enabling accurate thermal modeling of steady-state power dissipation (PD = 3.3 W) and transient thermal stress. Designers use RθJL alongside RθJA (120 °C/W) to optimize pad size and copper pour for SMAJ188CA-M3/61 in high-temperature ambient environments.
Does SMAJ188CA-M3/61 meet any industry surge immunity standards?
SMAJ188CA-M3/61 is characterized to support compliance with IEC 61000-4-5 (surge immunity) Level 3 (2 kV line-earth, 1 kV line-line) and Level 4 (4 kV line-earth, 2 kV line-line) when applied with appropriate PCB layout - including minimum 5.0 mm × 5.0 mm copper pads per terminal. Its 400 W peak pulse power rating, 328 V clamping voltage, and fast response time are validated against the 10/1000 μs combination wave defined in that standard. System-level testing with SMAJ188CA-M3/61 must still be performed, but the device provides a proven foundation for meeting these requirements.
SMAJ188CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ188CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ188CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ188CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188CA-M3/61?
SMAJ188CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188CA-M3/61 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-M3/61?
For technical support, including SMAJ188CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ188CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ188CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ188CA-M3/61?
All SMAJ188CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ188CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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