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Vishay General Semiconductor - Diodes Division SMCJ188CAHM3_A/I
- Part No.:
- SMCJ188CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ188CAHM3_A/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,191
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Product details
Overview
SMCJ188CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 188 V standoff voltage (VWM), 328 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It clamps transients to ≤328 V at rated surge, features glass-passivated junction, AEC-Q101 qualification, and operates from −55 °C to +150 °C - deployed in automotive power line and industrial sensor interface protection.
For engineers reviewing the SMCJ188CAHM3_A/I datasheet, SMCJ188CAHM3_A/I pinout, SMCJ188CAHM3_A/I application, or SMCJ188CAHM3_A/I equivalent, key selection criteria include bidirectional clamping behavior, 188 V VWM tolerance, 328 A IPPM capability under 10/1000 µs waveform, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS-compliant HM3 suffix packaging.
Technical Context
This device operates as a voltage-clamping protector using avalanche breakdown across both polarities. Its bidirectional symmetry ensures identical VBR min/max (209–231 V), ID ≤1.0 µA at VWM, and VC ≤328 V at IPPM - all specified per ANSI/IEEE C62.35 standards. The SMC package enables surface-mount automated placement while meeting MSL level 1 and JESD201 Class 2 whisker resistance.
Thermal design relies on RθJL = 15 °C/W to leads and RθJA = 75 °C/W to ambient (on 8 mm × 8 mm copper pads), supporting sustained 6.5 W dissipation at TA = 50 °C. The 0.108 %/°C VBR temperature coefficient ensures stable clamping over its full −55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse voltage before clamping begins; defines system operating margin against transients. |
| VBR (min/max) | 209 V / 231 V - breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | ≤328 V - clamped voltage during 10/1000 µs surge at 328 A; determines protected circuit's maximum stress exposure. |
| PPPM | 1500 W - peak transient energy handling capacity; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| IPPM | 328 A - maximum non-repetitive surge current it can shunt without failure; requires PCB copper pad derating above 25 °C. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments. |
| RθJA | 75 °C/W - thermal resistance to ambient on standard 8 mm × 8 mm pads; informs heatsinking requirements for repeated surges. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix), matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; reverse-bias reference for bidirectional operation | Terminal where conventional current enters during forward conduction; symmetric with cathode for bidirectional clamping. |
| Cathode | Current exit terminal in forward bias; reverse-bias reference for bidirectional operation | Terminal where conventional current exits during forward conduction; electrically identical to anode in bidirectional mode - no polarity marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR (209–231 V) and VC (≤328 V) in both directions - eliminates need for polarity-aware layout in AC or floating lines. |
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications - supports long-term reliability in harsh thermal/vibration environments. |
| Low incremental surge resistance | Enables tight VC control during fast 10/1000 µs transients - reduces overshoot into protected ICs or MOSFET gates. |
| Glass passivated junction | Improves moisture resistance and long-term stability vs. epoxy-passivated alternatives - critical for industrial field deployments. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - allows direct placement without baking or dry-pack handling. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and microcontrollers. Use Value: Withstands 1500 W surges and clamps to ≤328 V, preventing damage to downstream 36 V-rated regulators and logic. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) shunt protector on signal lines between sensors and ADC inputs. Use Value: Bidirectional response protects against ±8 kV contact ESD (IEC 61000-4-2) without distorting low-level mV-range signals. |
| Telecom Line Surge Suppression | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors against lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: First-stage protector on differential pairs, coordinated with GDT or polymer PTC secondary stages. Use Value: 328 A IPPM and 1500 W PPPM meet GR-1089-CORE Level 3 telecom surge requirements with minimal PCB footprint. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback before reaching driver FETs or MCU GPIOs. Use Value: 188 V VWM matches 24–48 V motor bus rails; 328 V VC prevents gate oxide rupture in 60 V-rated MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188CAHM3_A/I | Same VWM/VBR/VC specs but lower PPPM (600 W) and IPPM (131 A); SMB package (smaller footprint, higher RθJA). | Lower surge rating limits use to sub-IEC 61000-4-5 Level 3 systems; preferred where space is constrained and surge threat is moderate. | Select when board area is critical and peak surge energy does not exceed 600 W. |
| SMCJ188AHE3_A/I | Unidirectional version; same VWM/VBR/VC but adds forward voltage drop (VF = 3.5 V @ 100 A); HE3 = AEC-Q101, RoHS, non-halogen-free. | Requires polarity-aware layout; suitable only for DC rails with defined ground reference - not for AC or floating signals. | Choose only for unidirectional DC protection where cathode orientation is fixed and halogen content is unrestricted. |
Compared with SMCJ188CAHM3_A/I, SMBJ188CAHM3_A/I trades surge robustness for compactness, while SMCJ188AHE3_A/I sacrifices bidirectionality for slightly lower cost and non-halogen compliance - making the original the optimal choice for high-energy, polarity-agnostic protection in automotive and industrial settings.
Availability
SMCJ188CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom line surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMCJ188CAHM3_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, AEC-Q qualification, and application-specific performance.
The SMCJ series targets high-energy transient suppression in demanding environments - engineered for automotive, industrial, and telecom applications where consistent clamping, thermal resilience, and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMCJ188CAHM3_A/I under maximum rated surge?
The SMCJ188CAHM3_A/I clamps to a maximum of 328 V when subjected to its rated 10/1000 µs peak pulse current of 328 A. This VC value is guaranteed per the Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case transients. Designers must ensure downstream components tolerate this clamped voltage under surge conditions. The SMCJ188CAHM3_A/I achieves this with low incremental surge resistance and symmetric bidirectional structure.
Is SMCJ188CAHM3_A/I suitable for automotive applications?
Yes, SMCJ188CAHM3_A/I is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive powertrain, body electronics, and chassis modules. Its −55 °C to +150 °C operating range, MSL Level 1 moisture sensitivity rating, and validation for mechanical shock/vibration align with automotive reliability requirements. The SMCJ188CAHM3_A/I is commonly used in battery line protection for ECUs and ADAS sensor hubs where bidirectional surge immunity is essential.
How does the HM3 suffix differ from E3 or HE3 in SMCJ188CA part numbering?
The HM3 suffix on SMCJ188CAHM3_A/I denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - distinct from E3 (RoHS-compliant commercial grade), HE3 (RoHS-compliant + AEC-Q101, but not halogen-free), and M3 (halogen-free RoHS commercial grade only). The SMCJ188CAHM3_A/I thus satisfies strict environmental and automotive reliability mandates simultaneously, with JESD201 Class 2 whisker resistance and matte tin plating per J-STD-002.
What is the thermal resistance of SMCJ188CAHM3_A/I, and how does it affect layout?
The SMCJ188CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, and RθJL = 15 °C/W to leads. This means PCB layout must allocate sufficient copper area to avoid exceeding +150 °C junction temperature during repeated surges. Derating curves in the datasheet require reducing IPPM by ~20% at TA = 85 °C. Proper thermal design directly impacts the real-world surge endurance of the SMCJ188CAHM3_A/I.
Does SMCJ188CAHM3_A/I have polarity markings, and how is it connected in-circuit?
No, SMCJ188CAHM3_A/I is a bidirectional TVS and carries no polarity marking - unlike unidirectional variants which feature a cathode band. It connects symmetrically across protected lines (e.g., between signal and ground, or across differential pairs), with either terminal usable as anode or cathode. This simplifies layout and eliminates orientation errors during automated assembly. The SMCJ188CAHM3_A/I functions identically regardless of voltage polarity, enabling robust protection for AC-coupled or floating interfaces.
SMCJ188CAHM3_A/I 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ188CAHM3_A/I FAQ
1.How can I place an order for SMCJ188CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ188CAHM3_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 SMCJ188CAHM3_A/I reliable?
The price and inventory of SMCJ188CAHM3_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 SMCJ188CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ188CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ188CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ188CAHM3_A/I?
SMCJ188CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ188CAHM3_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 SMCJ188CAHM3_A/I?
For technical support, including SMCJ188CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ188CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ188CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ188CAHM3_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 SMCJ188CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ188CAHM3_A/I?
All SMCJ188CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ188CAHM3_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 SMCJ188CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ188CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ188CAHM3_A/I Tags
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