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Vishay General Semiconductor - Diodes Division SMCJ188A-M3/9AT
- Part No.:
- SMCJ188A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ188A-M3/9AT.pdf
- Description:
- TVS DIODE 188VWM DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,487
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Product details
Overview
SMCJ188A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 188 V standoff voltage (VWM), 209–231 V breakdown voltage (VBR), and 1500 W peak pulse power (PPPM) at 10/1000 μs waveform. It clamps transients to ≤328 V at 4.6 A peak surge current and operates across –55 °C to +150 °C junction temperature - deployed in automotive power line and industrial sensor interface protection.
For engineers reviewing the SMCJ188A-M3/9AT datasheet, SMCJ188A-M3/9AT pinout, SMCJ188A-M3/9AT application, or SMCJ188A-M3/9AT equivalent, this page delivers verified electrical specs, thermal resistance (RθJA = 75 °C/W), polarity marking (cathode band), halogen-free RoHS compliance (M3 suffix), and real-world use context for ESD/surge hardening of 12–48 V DC systems.
Technical Context
The SMCJ188A-M3/9AT uses a glass-passivated silicon junction optimized for fast response (<1 ns) to transient overvoltages and low incremental surge resistance to maintain stable clamping under repetitive surges. Its unidirectional polarity enables integration into DC-biased lines where reverse conduction must be blocked.
Rated for 1500 W peak pulse power with derating above 25 °C ambient, it achieves 328 V clamping voltage at 4.6 A IPPM while maintaining <1.0 μA leakage at 188 V standoff - enabling robust protection without loading normal operating circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 188 V - Maximum continuous reverse voltage before clamping begins; sets operating margin for 12–48 V DC bus protection. |
| VBR (Breakdown Voltage) | 209–231 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably. |
| VC (Clamping Voltage) | ≤328 V at IPPM = 4.6 A - Peak voltage seen by protected circuit during worst-case 10/1000 μs surge. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity per IEC 61000-4-5 Level 4 surge test conditions. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads; dictates heatsinking needs. |
| Operating Temperature | –55 °C to +150 °C - Validated junction range for under-hood automotive and industrial control environments. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current, conducts only during positive transients. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected line (e.g., 24 V rail); clamps positive transients to ground when voltage exceeds VBR. |
| Anode (non-banded end) | Ground reference terminal | Connected to system ground or low-impedance return path; completes clamping loop during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity without derating in standard PCB layout. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping precision. |
| Halogen-free & RoHS-compliant (M3) | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) without compromising surge performance. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly lines. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) against load dump and inductive switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between battery rail and downstream DC/DC converter input. Use Value: Limits transient voltage to ≤328 V, preventing damage to 36 V-rated input stages while surviving repeated 12 V load dump events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to relay coil kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed across signal and return lines to shunt induced spikes before reaching ADC or op-amp inputs. Use Value: Clamps sub-μs transients to safe levels without adding capacitance (>100 pF typical), preserving signal integrity up to 100 kHz bandwidth. |
| Telecom DC Power Feeds | Renewable Energy Inverter Control |
|
Use Scenario: Shielding -48 V DC power inputs in base station remote radio units (RRUs) from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line transient suppressor mounted at connector entry point, upstream of primary DC/DC stage. Use Value: Absorbs 1500 W surges with <1 ns response, reducing downstream MOV/staging requirements and extending system MTBF. |
Use Scenario: Protecting gate drive signals and auxiliary power rails in solar inverter microcontrollers against grid-switching transients. IC Role / Device Role / Timing Role: Localized TVS on isolated 15 V gate driver supply, referenced to local ground plane. Use Value: Maintains 188 V standoff while clamping to 328 V - sufficient margin above 15 V rail yet robust enough for 1 kV surge coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188A-M3/57T | Lower PPPM (600 W), same VWM/VBR, SMB (DO-214AA) package - 30% smaller footprint, lower thermal mass. | Suitable for space-constrained consumer electronics; insufficient for automotive load dump per ISO 7637-2. | Select when board area is critical and surge energy is ≤600 W (e.g., USB-C PD port protection). |
| SMCJ188CA-M3/9AT | Bidirectional variant; identical VWM/VBR/PPPM but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs. | Choose only if bidirectional protection is mandated - unidirectional SMCJ188A-M3/9AT offers lower leakage and simpler biasing. |
Compared with SMBJ188A-M3/57T, the SMCJ188A-M3/9AT delivers 2.5× higher surge energy handling and superior thermal dissipation; versus SMCJ188CA-M3/9AT, it provides tighter leakage control and avoids unnecessary bidirectional conduction in DC-biased rails.
Availability
SMCJ188A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor module production, and telecom DC power feed protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ188A-M3/9AT 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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with focus on reliability, power efficiency, and application-specific ruggedness.
The SMCJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for AEC-Q101 qualification readiness and robust operation under extreme thermal and electrical stress.
FAQ
What is the maximum clamping voltage of the SMCJ188A-M3/9AT at its rated peak pulse current?
The SMCJ188A-M3/9AT clamps to a maximum of 328 V at its specified peak pulse current (IPPM) of 4.6 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings. The SMCJ188A-M3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ188A-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ188A-M3/9AT itself is not AEC-Q101 qualified; it carries the commercial-grade M3 suffix. For automotive use, Vishay specifies the HM3 suffix variants (e.g., SMCJ188A-HM3/9AT) which include full AEC-Q101 testing and documentation. The SMCJ188A-M3/9AT may be used in non-safety-critical automotive subsystems where qualification is not mandated, but designers must verify compliance with OEM-specific requirements before deployment. Always confirm qualification status via the official Vishay ordering code.
How does the SMCJ188A-M3/9AT differ from the SMCJ188CA-M3/9AT?
The SMCJ188A-M3/9AT is unidirectional with cathode band marking and blocks reverse current, while the SMCJ188CA-M3/9AT is bidirectional with no polarity marking and clamps transients in both directions. Both share identical VWM (188 V), VBR (209–231 V), PPPM (1500 W), and package (SMC). The SMCJ188A-M3/9AT exhibits lower reverse leakage (<1.0 μA) than the CA version, making it preferable for DC-biased applications like power rail protection. The SMCJ188A-M3/9AT is not interchangeable with the CA variant without circuit review.
What is the thermal resistance and recommended pad layout for the SMCJ188A-M3/9AT?
The SMCJ188A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as defined in Vishay's datasheet Figure 2. This pad size is mandatory to achieve rated power derating and avoid thermal runaway during repetitive surges. Smaller pads increase RθJA and reduce safe operating area - always follow the exact mounting footprint shown in the SMC (DO-214AB) mechanical drawing to ensure 1500 W pulse capability and 150 °C max junction temperature compliance.
Does the SMCJ188A-M3/9AT require external series impedance for optimal protection?
No, the SMCJ188A-M3/9AT functions as a standalone shunt protector and does not require external series impedance to meet its rated 1500 W PPPM performance. However, in high-frequency transient scenarios (e.g., ESD > 200 MHz), a small ferrite bead or 1–10 Ω resistor may be added in series to dampen ringing and improve clamping fidelity - this is application-dependent and not specified in the SMCJ188A-M3/9AT datasheet. The SMCJ188A-M3/9AT's low dynamic impedance ensures effective clamping even without added components in standard 10/1000 μs surge conditions.
SMCJ188A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ188A-M3/9AT FAQ
1.How can I place an order for SMCJ188A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ188A-M3/9AT 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 SMCJ188A-M3/9AT reliable?
The price and inventory of SMCJ188A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ188A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ188A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ188A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ188A-M3/9AT?
SMCJ188A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ188A-M3/9AT 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 SMCJ188A-M3/9AT?
For technical support, including SMCJ188A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ188A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ188A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ188A-M3/9AT 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 SMCJ188A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ188A-M3/9AT?
All SMCJ188A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ188A-M3/9AT, 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 SMCJ188A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ188A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ188A-M3/9AT Tags
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