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Vishay General Semiconductor - Diodes Division SMCJ188AHM3/I
- Part No.:
- SMCJ188AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ188AHM3/I.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,661
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Product details
Overview
SMCJ188AHM3/I 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, 209–231 V breakdown range at 1 mA, and 328 A peak pulse current under 10/1000 μs waveform. It delivers 1500 W peak pulse power dissipation and clamps transients to ≤328 V while operating from −55 °C to +150 °C junction temperature - deployed in automotive powertrain control units to safeguard MOSFET gate drivers against load dump spikes.
For engineers reviewing the SMCJ188AHM3/I datasheet, SMCJ188AHM3/I pinout, SMCJ188AHM3/I application, or SMCJ188AHM3/I equivalent, key selection criteria include verified unidirectional polarity, halogen-free RoHS-compliant HM3 suffix, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and clamping voltage performance at rated IPPM - all critical for automotive-grade transient suppression design validation.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector: when reverse voltage exceeds VBR (209–231 V), it avalanches into low-impedance conduction to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the SMC package supports automated placement and meets MSL level 1 per J-STD-020.
The device is rated for 1500 W peak pulse power (10/1000 μs), with maximum clamping voltage VC = 328 V at IPPM = 328 A and maximum reverse leakage ID = 1.0 μA at VWM = 188 V. It features a positive temperature coefficient of VBR (0.108 %/°C), enabling predictable derating above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - maximum continuous reverse operating voltage before significant leakage; defines upper limit for safe DC bias in protected line |
| VBR min/max | 209 V / 231 V at IT = 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across production lots |
| VC @ IPPM | 328 V at 328 A (10/1000 μs) - clamped voltage during worst-case surge; determines maximum stress on downstream ICs |
| PPPM | 1500 W - peak transient energy handling capacity; enables protection against ISO 7637-2 Pulse 5a/b load dump events |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs PCB thermal layout requirements |
| TJ max | +150 °C - maximum allowable junction temperature; supports operation in under-hood automotive environments |
| ID @ VWM | 1.0 μA - reverse leakage at full standoff voltage; negligible power loss in always-on protection configurations |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to system ground or low-side return path; must be routed with low-inductance trace for effective clamping |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 12 V rail); avalanche conduction occurs from cathode to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS power supplies, and infotainment systems per stress test requirements |
| Halogen-free HM3 suffix | Complies with IEC 61249-2-21 and JEDEC J-STD-20; eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating |
| Low incremental surge resistance | Enables tighter clamping (VC − VBR ≈ 100 V) and higher energy absorption efficiency vs. higher-RSURGE alternatives |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required prior to assembly |
| Glass passivated junction | Provides stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
Applications
| Automotive Load Dump Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Suppresses 12 V/24 V battery line transients caused by alternator load dump (ISO 7637-2 Pulse 5a/b) in engine control modules. IC Role / Device Role / Timing Role: Clamping TVS placed between battery rail and DC-DC input stage; responds within <1 ns to limit voltage to ≤328 V. Use Value: Prevents destruction of upstream buck controller ICs (e.g., LM5143A) by limiting peak stress to 328 V at 328 A surge current. | Use Scenario: Protects digital input channels of programmable logic controllers from induced surges due to relay coil switching in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS connected between field input line and common reference; clamps negative-going transients to ground. Use Value: Maintains signal integrity for 24 V digital inputs by holding clamp voltage below 328 V while sustaining >1000 surge cycles per IEC 61000-4-5. |
| Telecom Power Supply Input | Motor Drive Gate Driver Protection |
Use Scenario: Shields primary-side DC bus of telecom rectifiers from lightning-induced surges entering via AC mains or backup battery lines. IC Role / Device Role / Timing Role: Standoff-rated TVS installed across bulk capacitor input; conducts only during overvoltage events exceeding 188 V. Use Value: Extends service life of electrolytic bulk capacitors by limiting peak voltage stress to 328 V during 1500 W transient events. | Use Scenario: Guards high-side N-channel MOSFET gate driver ICs (e.g., UCC27531) against Miller-induced voltage spikes during fast-switching motor commutation. IC Role / Device Role / Timing Role: Localized TVS mounted directly at gate driver output pin; shunts transient energy before reaching MOSFET gate oxide. Use Value: Eliminates gate oxide failure risk by clamping spikes to ≤328 V with sub-nanosecond response, preserving 200 V+ gate drive margin. |
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-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), VC = 328 V at 125 A | Not suitable for ISO 7637-2 Pulse 5; limited to lower-energy IEC 61000-4-5 line surges | Select when board space is constrained and surge energy does not exceed 400 W |
| SMCJ188AHE3_A/I | Same electrical specs but E3 suffix (RoHS-compliant commercial grade, non-AEC-Q101) | Lacks automotive qualification; unsuitable for under-hood or safety-critical ECUs | Select for industrial/commercial designs where AEC-Q101 is not mandated |
Compared with SMCJ188AHM3/I, SMAJ188A-E3/57T offers reduced surge capability in a smaller footprint, while SMCJ188AHE3_A/I matches performance but omits automotive qualification - making SMCJ188AHM3/I the sole choice for AEC-Q101-compliant 1500 W clamping in SMC package.
Availability
SMCJ188AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom power supplies, and motor drive systems requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ188AHM3/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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robust 1500 W clamping and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMCJ188AHM3/I at its rated peak pulse current?
The SMCJ188AHM3/I has a maximum clamping voltage VC of 328 V at IPPM = 328 A under the standardized 10/1000 μs double-exponential surge waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ188AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMCJ188AHM3/I qualified to AEC-Q101, and what does that mean for automotive use?
Yes, SMCJ188AHM3/I carries the HM3 suffix, confirming it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This means the device has passed rigorous stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for automotive powertrain, chassis, and body electronics. The SMCJ188AHM3/I is approved for under-hood deployment where junction temperatures reach +150 °C.
How does the HM3 suffix differ from the E3 or M3 suffix in the SMCJ188A family?
The HM3 suffix on SMCJ188AHM3/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. In contrast, E3 indicates RoHS-compliant commercial grade (no automotive qualification), and M3 indicates halogen-free RoHS-compliant commercial grade. Only HM3 and HE3 variants are AEC-Q101 qualified; among those, HM3 adds halogen-free compliance. The SMCJ188AHM3/I thus satisfies both environmental and automotive reliability mandates simultaneously.
What is the thermal resistance of SMCJ188AHM3/I, and how does it affect PCB layout?
The SMCJ188AHM3/I has a typical junction-to-ambient thermal resistance RθJA of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. This value assumes no additional heatsinking; for sustained power dissipation or elevated ambient temperatures, designers must increase copper area or add thermal vias. The SMCJ188AHM3/I's RθJL = 15 °C/W (junction-to-lead) further supports efficient heat transfer through solder joints into internal PCB planes.
Can SMCJ188AHM3/I be used in bidirectional protection circuits?
No, SMCJ188AHM3/I is a unidirectional TVS diode, identified by its cathode band marking and specified electrical parameters (e.g., forward voltage VF = 3.5 V at 100 A). For bidirectional protection, Vishay specifies the SMCJ188CA variant, which lacks polarity marking and exhibits symmetrical breakdown in both directions. Using SMCJ188AHM3/I in place of a bidirectional device would result in unintended forward conduction during negative transients - the SMCJ188AHM3/I must be oriented correctly in unidirectional applications only.
SMCJ188AHM3/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:
- Discontinued at Digi-Key
- 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):
- 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)
SMCJ188AHM3/I FAQ
1.How can I place an order for SMCJ188AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ188AHM3/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 SMCJ188AHM3/I reliable?
The price and inventory of SMCJ188AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ188AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ188AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ188AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ188AHM3/I?
SMCJ188AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ188AHM3/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 SMCJ188AHM3/I?
For technical support, including SMCJ188AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ188AHM3/I requirements.
6.How does Aetrix verify that SMCJ188AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ188AHM3/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 SMCJ188AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ188AHM3/I?
All SMCJ188AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ188AHM3/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 SMCJ188AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ188AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ188AHM3/I Tags
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