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Vishay General Semiconductor - Diodes Division SMCJ18AHM3_A/H
- Part No.:
- SMCJ18AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,720
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Product details
Overview
SMCJ18AHM3_A/H 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 1500 W peak pulse power rating, 20.0 V to 22.1 V breakdown voltage (VBR), and 29.2 V maximum clamping voltage (VC) at 51.4 A IPPM. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.
For engineers reviewing the SMCJ18AHM3_A/H datasheet, SMCJ18AHM3_A/H pinout, SMCJ18AHM3_A/H application, or SMCJ18AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 18 V stand-off voltage (VWM), low 1.0 μA reverse leakage at VWM, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when transient voltage exceeds its breakdown threshold, limiting downstream voltage to ≤29.2 V during a 10/1000 μs surge. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance for repeatable clamping performance.
Rated for -55 °C to +150 °C junction temperature, it features MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 solderability standards. The HM3 suffix confirms halogen-free, RoHS-compliant construction with AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.0 V / 22.1 V - defines minimum and maximum voltage at which avalanche conduction begins under 1.0 mA test current |
| VWM | 18 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 29.2 V @ 51.4 A - clamped voltage seen by protected circuit during full-rated 1500 W transient |
| IPPM | 51.4 A - peak surge current supported with 10/1000 μs waveform without failure |
| PPPM | 1500 W - maximum non-repetitive transient power dissipation capability |
| ID @ VWM | 1.0 μA - reverse leakage current at rated stand-off voltage, critical for low-power sensor line integrity |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal avalanche diode structure | Connected to protected circuit's higher-potential node (e.g., VCC, bus line); clamps positive transients to ground |
| Anode | Cathode of internal avalanche diode structure | Connected to system ground or reference plane; completes clamping path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring long-term reliability under thermal cycling and vibration |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and enables use in green manufacturing programs without compromising surge robustness |
| 1500 W peak pulse power | Provides margin against ISO 7637-2 Pulse 1/2a/5a transients and IEC 61000-4-5 Level 4 surges in 12 V/24 V vehicle systems |
| Low 1.0 μA leakage @ 18 V | Minimizes standby power loss and avoids false triggering in battery-powered sensor nodes and always-on ECUs |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting 12 V supply rails in body control modules from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp spikes above 29.2 V. Use Value: Prevents latch-up or permanent damage to buck controller ICs during ISO 16750-2 load dump events up to 35 V. | Use Scenario: Safeguarding PLC analog input channels connected to 4–20 mA current loops exposed to field wiring surges. IC Role / Device Role / Timing Role: TVS mounted across input terminals to shunt induced lightning-induced transients before reaching precision op-amps. Use Value: Maintains <1.0 μA leakage to preserve loop accuracy while clamping 1 kV/0.5 kA surges per IEC 61000-4-5. |
| Automotive Sensor Signal Lines | Consumer Appliance Power Supplies |
Use Scenario: Shielding LIN bus transceivers and Hall-effect position sensors from ESD and inductive kickback in HVAC actuators. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) used on signal line to suppress ±15 kV contact ESD per IEC 61000-4-2. Use Value: Sub-30 V clamping ensures transceiver IC remains within absolute maximum ratings during fast-rising transients. | Use Scenario: Adding secondary surge protection on AC-DC adapter output rails feeding microcontrollers in smart home devices. IC Role / Device Role / Timing Role: Final-stage TVS placed after bulk capacitor to absorb residual switching noise and external surges. Use Value: 1500 W rating handles repeated 10/1000 μs surges from shared household circuits without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3_A/H | Lower 400 W PPPM, same VWM/VBR range, SMA package (smaller footprint, lower thermal mass) | Not suitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4; limited to consumer-grade surge immunity | Select when board space is constrained and surge threat level is ≤400 W (e.g., USB-powered peripherals) |
| SMCJ18AHE3_A/H | Same 1500 W rating and electrical specs, but commercial-grade (non-AEC-Q101) and RoHS-compliant only (not halogen-free) | Lacks automotive qualification; not approved for under-hood or safety-critical ECU use | Select for cost-sensitive industrial controls where AEC-Q101 and halogen-free requirements do not apply |
Compared with SMCJ18AHM3_A/H, SMAJ18AHE3_A/H offers smaller size but insufficient surge capacity for automotive, while SMCJ18AHE3_A/H matches performance but lacks AEC-Q101 and halogen-free compliance required for Tier 1 automotive sourcing.
Availability
SMCJ18AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, sensor interface modules, and consumer power adapters requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMCJ18AHM3_A/H 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 demanding industrial and automotive applications.
The SMCJ series is engineered specifically for high-energy transient suppression in 12 V/24 V automotive and industrial power systems, emphasizing AEC-Q101 qualification, robust clamping consistency, and SMT manufacturability.
FAQ
What is the clamping voltage of the SMCJ18AHM3_A/H under full-rated surge conditions?
The SMCJ18AHM3_A/H has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 51.4 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected downstream ICs remain within safe operating limits during standardized surge events. The SMCJ18AHM3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ18AHM3_A/H suitable for automotive applications?
Yes, the SMCJ18AHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use, as confirmed by its HM3 suffix and inclusion in Vishay's automotive-grade ordering matrix. It meets requirements for under-hood and chassis-mounted modules subject to thermal cycling, vibration, and ISO 7637-2 transients. The SMCJ18AHM3_A/H is commonly deployed in body control units, lighting drivers, and sensor interfaces where certified reliability is mandatory.
What does the "HM3" suffix indicate in SMCJ18AHM3_A/H?
The "HM3" suffix in SMCJ18AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3") and confirms compliance with automotive environmental and reliability standards. The SMCJ18AHM3_A/H also meets JESD 201 Class 2 whisker resistance and MSL Level 1 handling requirements for lead-free reflow.
How does the SMCJ18AHM3_A/H differ from the SMCJ18AHE3_A/H?
The SMCJ18AHM3_A/H adds halogen-free material compliance and retains AEC-Q101 qualification, whereas SMCJ18AHE3_A/H is RoHS-compliant and AEC-Q101 qualified but not halogen-free. Both share identical electrical specs and SMC package, but the SMCJ18AHM3_A/H satisfies stricter Tier 1 automotive sustainability mandates. For designs requiring both automotive qualification and halogen-free certification, the SMCJ18AHM3_A/H is the correct choice.
What is the reverse leakage current specification for the SMCJ18AHM3_A/H at its stand-off voltage?
The SMCJ18AHM3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 18 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor paths and minimizes quiescent power loss in battery-backed systems. The SMCJ18AHM3_A/H maintains leakage below 10 μA up to +125 °C, supporting reliable operation in thermally demanding environments.
SMCJ18AHM3_A/H 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- 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)
SMCJ18AHM3_A/H FAQ
1.How can I place an order for SMCJ18AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHM3_A/H 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 SMCJ18AHM3_A/H reliable?
The price and inventory of SMCJ18AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ18AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHM3_A/H?
SMCJ18AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHM3_A/H 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 SMCJ18AHM3_A/H?
For technical support, including SMCJ18AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ18AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHM3_A/H 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 SMCJ18AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ18AHM3_A/H?
All SMCJ18AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHM3_A/H, 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 SMCJ18AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ18AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHM3_A/H Tags
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