My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ18AHM3_A/I
- Part No.:
- SMCJ18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,699
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ18AHM3_A/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 1500 W peak pulse power rating, 20.0 V to 22.1 V breakdown voltage range at 1 mA test current, and 29.2 V maximum clamping voltage at 51.4 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the SMCJ18AHM3_A/I datasheet, SMCJ18AHM3_A/I pinout, SMCJ18AHM3_A/I application, or SMCJ18AHM3_A/I equivalent, key selection criteria include unidirectional polarity, 18 V stand-off voltage, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance of 75 °C/W junction-to-ambient under standard pad layout.
Technical Context
The SMCJ18AHM3_A/I operates as a clamping-type TVS diode using an avalanche breakdown mechanism to limit transient overvoltages on DC power and signal lines. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 18 V), while its low incremental surge resistance enables effective energy diversion during 10/1000 μs waveform surges.
Designed for automated SMT assembly, it meets JESD201 Class 2 whisker resistance and MSL Level 1 per J-STD-020 with 260 °C peak reflow profile. The device is rated for -55 °C to +150 °C operating junction temperature and supports 200 A non-repetitive forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 20.0 V min to 22.1 V max at 1 mA - defines minimum voltage at which avalanche conduction begins, ensuring reliable triggering above normal 18 V rail operation |
| Stand-off Voltage VWM | 18 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for protected circuit DC bias |
| Clamping Voltage VC | 29.2 V at 51.4 A IPPM - peak voltage seen by downstream circuit during 10/1000 μs surge; determines safe margin for 24 V system components |
| Peak Pulse Power PPPM | 1500 W - maximum transient energy absorption capability under standardized 10/1000 μs waveform, enabling robust lightning/inductive-switching protection |
| Junction Temperature Range | -55 °C to +150 °C - supports operation in under-hood automotive and industrial environments without derating below 25 °C ambient |
| Thermal Resistance RθJA | 75 °C/W - junction-to-ambient value measured on 8.0 mm × 8.0 mm copper pads; guides PCB copper area design for thermal management |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Polarity indicated by cathode band; unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during positive transients on cathode side |
| Cathode | High-side connection point | Connected to protected line (e.g., 18 V rail); conducts avalanche current to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge performance |
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with standard pick-and-place equipment for automated manufacturing |
| Very fast response time (<1 ps) | Clamps transients before sensitive downstream components experience damaging overvoltage stress |
| Excellent clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during surge events, preserving margin for 24 V-rated ICs and MOSFETs |
| MSL Level 1 moisture sensitivity | Allows indefinite floor life without dry-pack storage or baking prior to reflow soldering |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V–24 V battery-fed ECUs and body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and ground to shunt surge energy away from LDOs and microcontrollers. Use Value: Withstands 1500 W surges and clamps to ≤29.2 V, ensuring downstream 36 V-rated regulators remain within safe operating area during ISO 7637-2 Pulse 5a events. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance transient suppressor installed at connector interface to prevent latch-up or gate oxide damage in precision ADC front-ends. Use Value: Sub-1 μA leakage at 18 V prevents signal offset errors; fast avalanche response limits transient duration to <1 ns, avoiding sampling corruption in 1 MSPS data acquisition. |
| DC-DC Converter Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices exposed to Ethernet cable-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS placed upstream of input filter capacitor to absorb induced common-mode transients before they reach switching controller. Use Value: 200 A IFSM rating handles repetitive 8.3 ms surges; 75 °C/W RθJA allows thermal stability on compact 4-layer boards with minimal copper area. | Use Scenario: Protecting AC/DC front-end rectifiers and PFC stages in telecom rectifier shelves subjected to lightning-induced surges on AC mains. IC Role / Device Role / Timing Role: Secondary-side unidirectional clamp on +48 V DC distribution bus to suppress coupled transients from primary-side MOV failure or grid switching noise. Use Value: AEC-Q101 qualification ensures long-term reliability in 24/7 operation; halogen-free molding compound meets IPC-1752 material declaration requirements for network infrastructure gear. |
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 PPPM (400 W), SMA package (DO-214AC), same VBR range but higher VC (32.4 V) | Suitable only for lower-energy transients; not recommended for ISO 7637-2 Pulse 5a or high-current inductive switching | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD or low-energy ring wave |
| SMCJ18AHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified) | Lacks automotive qualification and halogen-free certification; acceptable for industrial/commercial designs without automotive compliance mandates | Choose for cost-sensitive non-automotive applications where AEC-Q101 and halogen-free status are not required |
Compared with SMCJ18AHM3_A/I, SMAJ18AHE3_A/H offers smaller footprint but significantly reduced surge handling; SMCJ18AHE3_A/I matches form-fit-function but omits AEC-Q101 validation and halogen-free assurance-making SMCJ18AHM3_A/I the sole choice for automotive-grade 18 V rail protection requiring both reliability and regulatory compliance.
Availability
SMCJ18AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMCJ18AHM3_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 high-reliability and application-specific performance.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments-including automotive, industrial, and telecom-where robust clamping, thermal stability, and qualification-grade reliability are mandatory.
FAQ
What is the clamping voltage of the SMCJ18AHM3_A/I at its rated peak pulse current?
The SMCJ18AHM3_A/I has a maximum clamping voltage (VC) of 29.2 V at 51.4 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured across the device terminals during surge conduction and represents the highest voltage imposed on the protected circuit during worst-case transient events. The SMCJ18AHM3_A/I maintains this clamping performance across its full operating temperature range and after repeated surge exposures, as verified in Vishay's AEC-Q101 qualification testing.
Is the SMCJ18AHM3_A/I suitable for automotive applications?
Yes, the SMCJ18AHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to ensure reliability in engine control units, body electronics, and ADAS power domains. The SMCJ18AHM3_A/I meets all requirements for under-hood deployment up to +150 °C junction temperature and supports ISO 7637-2 Pulse 5a compliance when properly mounted on specified copper pad areas.
How does the SMCJ18AHM3_A/I differ from the SMCJ18AHE3_A/I variant?
The SMCJ18AHM3_A/I and SMCJ18AHE3_A/I share identical electrical specifications, SMC (DO-214AB) package, and marking code, but differ in material compliance and qualification: SMCJ18AHM3_A/I is halogen-free and AEC-Q101 qualified, whereas SMCJ18AHE3_A/I is RoHS-compliant commercial grade without halogen-free certification or automotive qualification. This makes the SMCJ18AHM3_A/I appropriate for automotive Tier 1 suppliers and industrial safety-critical systems, while SMCJ18AHE3_A/I serves cost-sensitive commercial applications where those certifications are unnecessary.
What is the thermal resistance of the SMCJ18AHM3_A/I, and how does it affect PCB layout?
The SMCJ18AHM3_A/I 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. This value directly informs PCB copper area requirements: reducing thermal resistance requires increasing pad size or adding internal copper planes connected via multiple vias. For sustained power dissipation or high-ambient environments, designers should verify junction temperature rise using PD = 6.5 W and ensure TJ remains ≤150 °C. The SMCJ18AHM3_A/I's RθJA is measured under JEDEC-standard conditions and forms the basis for thermal derating curves in the official Vishay datasheet.
Does the SMCJ18AHM3_A/I have polarity markings, and how is it oriented on the PCB?
Yes, the SMCJ18AHM3_A/I is a unidirectional TVS diode with a visible cathode band printed on the device body-this band must be aligned toward the higher-potential side (e.g., 18 V rail), while the anode connects to ground or low-side reference. Incorrect orientation will prevent proper clamping during positive transients and may lead to catastrophic failure under surge conditions. The SMCJ18AHM3_A/I's polarity is defined in the Vishay datasheet Figure 1 and confirmed by its DO-214AB mechanical outline; no marking appears on bidirectional variants, but the SMCJ18AHM3_A/I always uses the banded orientation.
SMCJ18AHM3_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:
- 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/I FAQ
1.How can I place an order for SMCJ18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHM3_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 SMCJ18AHM3_A/I reliable?
The price and inventory of SMCJ18AHM3_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 SMCJ18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHM3_A/I?
SMCJ18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHM3_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 SMCJ18AHM3_A/I?
For technical support, including SMCJ18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHM3_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 SMCJ18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ18AHM3_A/I?
All SMCJ18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHM3_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 SMCJ18AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHM3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
