My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ18AHE3/9AT
- Part No.:
- SMCJ18AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,128
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ18AHE3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 51.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive ECUs, industrial motor drives, and telecom power supplies.
For engineers reviewing the SMCJ18AHE3/9AT datasheet, SMCJ18AHE3/9AT pinout, SMCJ18AHE3/9AT application, or SMCJ18AHE3/9AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (VC/VBR ≈ 1.42), and compatibility with automated SMT assembly on standard 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18AHE3/9AT operates as a silicon avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and stable clamping under repetitive transients. Its unidirectional configuration enables cathode-referenced protection on positive-rail systems, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W ensuring reliable operation up to TJ = +150 °C.
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) when applied with proper PCB layout - including minimum 8.0 mm × 8.0 mm copper pads per terminal and adherence to MSL Level 1 reflow profile (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - ensures predictable avalanche initiation across temperature and unit variation |
| VC @ IPPM | 29.2 V at 51.4 A - limits downstream voltage stress during 10/1000 µs surge events |
| PPPM | 1500 W - supports high-energy transient suppression without failure in automotive and industrial environments |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves system efficiency in battery-powered and low-power circuits |
| TJ max | +150 °C - enables deployment in under-hood automotive modules and enclosed industrial enclosures |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band; anode and cathode terminals are axially oriented along the body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node for unidirectional clamping | Connected to protected line (e.g., +12 V rail); clamps to cathode when voltage exceeds VBR |
| Cathode | Clamping output / ground reference | Connected to system ground or lower-potential rail; defines clamping threshold relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| MSL Level 1 rating | Enables direct placement into lead-free reflow without baking or special handling |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for industrial and transportation equipment safety certifications |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery feed and LDO/regulator input. Use Value: Limits transient voltage to ≤29.2 V during 1500 W surges, preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Safeguarding gate driver ICs and MOSFETs in variable-frequency drives from switching-induced voltage spikes. IC Role / Device Role / Timing Role: DC bus rail protector on high-side switch nodes exposed to inductive kickback. Use Value: Clamps 51.4 A surge within nanoseconds, maintaining gate oxide integrity and avoiding false turn-on. |
| Telecom DC Power Interface | Consumer Appliance Mainboard Input |
Use Scenario: Shielding PoE-powered Ethernet switches from lightning-induced surges on 48 V input lines. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC-DC converter input after isolation. Use Value: Withstands repeated 10/1000 µs transients up to 1500 W while maintaining <1 µA leakage at 18 V. | Use Scenario: Securing AC-DC adapter outputs feeding mainboards in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Final-stage overvoltage guard before microcontroller and sensor power domains. Use Value: AEC-Q101 qualification ensures long-term reliability in thermally cycled home appliance environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3/9AT | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR/VC specs | Not suitable for 1500 W surge environments; limited to low-energy signal-line protection | Select only when board space is constrained and surge energy is ≤400 W |
| SMCJ18AHM3/9AT | Halogen-free version with identical electrical specs and AEC-Q101 qualification | No functional difference; required only where halogen-free compliance is mandated by OEM spec | Choose for RoHS+halogen-free programs without compromising performance or qualification |
Compared with SMCJ18AHE3/9AT, SMAJ18AHE3/9AT trades surge capacity for footprint reduction, while SMCJ18AHM3/9AT maintains full equivalence except for halogen content - making the HE3 variant optimal for general-purpose AEC-Q101-compliant 1500 W protection.
Availability
SMCJ18AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial motor controls, and telecom power interfaces requiring stable component supply, AEC-Q101 validation, and 1500 W transient immunity.
Supply support for SMCJ18AHE3/9AT 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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMCJ18AHE3/9AT at its rated peak pulse current?
The SMCJ18AHE3/9AT has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 51.4 A, measured using the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 29.2 V during worst-case surge events. The SMCJ18AHE3/9AT achieves this with low incremental resistance, minimizing voltage overshoot beyond VC.
Is SMCJ18AHE3/9AT qualified for automotive applications?
Yes, SMCJ18AHE3/9AT is AEC-Q101 qualified, confirming its reliability for automotive use cases including engine control, body electronics, and ADAS subsystems. The qualification covers temperature cycling, highly accelerated life testing (HALT), and ESD robustness. This makes SMCJ18AHE3/9AT suitable for under-hood and cabin-mounted modules where thermal stress and long service life are critical. The "HE3" suffix explicitly denotes AEC-Q101 compliance.
What is the standoff voltage and breakdown range for SMCJ18AHE3/9AT?
The SMCJ18AHE3/9AT has a reverse stand-off voltage (VWM) of 18 V and a breakdown voltage (VBR) range of 20.0 V to 22.1 V at test current IT = 1 mA. This 11% VBR tolerance ensures consistent clamping behavior across production lots while maintaining safe margin above normal operating voltage. The SMCJ18AHE3/9AT is unidirectional, so VBR applies only in reverse bias - forward conduction follows standard diode characteristics with VF = 3.5 V at IF = 100 A.
What package type does SMCJ18AHE3/9AT use and what are its mounting requirements?
SMCJ18AHE3/9AT uses the SMC (DO-214AB) surface-mount package, measuring 7.11 mm × 6.22 mm × 2.62 mm with axial anode/cathode terminals. Mounting requires minimum 8.0 mm × 8.0 mm copper pads per terminal for thermal dissipation and surge current handling. The device meets MSL Level 1 and is compatible with standard lead-free reflow profiles peaking at 260 °C. The cathode is marked by a visible band on the body.
How does SMCJ18AHE3/9AT compare to bidirectional variants like SMCJ18CA?
SMCJ18AHE3/9AT is unidirectional, while SMCJ18CA is bidirectional - meaning the latter clamps in both polarities and lacks polarity marking. Electrically, SMCJ18CA shares identical VWM (18 V), VBR (20.0–22.1 V), and VC (29.2 V) but exhibits symmetric behavior ideal for AC-coupled or floating signal lines. The SMCJ18AHE3/9AT is preferred for DC power rail protection where polarity is fixed and cathode grounding simplifies layout. Both share the same PPPM (1500 W) and AEC-Q101 qualification when specified with HE3 suffix.
SMCJ18AHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ18AHE3/9AT FAQ
1.How can I place an order for SMCJ18AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHE3/9AT 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 SMCJ18AHE3/9AT reliable?
The price and inventory of SMCJ18AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHE3/9AT?
SMCJ18AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHE3/9AT 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 SMCJ18AHE3/9AT?
For technical support, including SMCJ18AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHE3/9AT requirements.
6.How does Aetrix verify that SMCJ18AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHE3/9AT 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 SMCJ18AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18AHE3/9AT?
All SMCJ18AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHE3/9AT, 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 SMCJ18AHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHE3/9AT 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 …
