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Vishay General Semiconductor - Diodes Division SMCJ18AHE3_A/H
- Part No.:
- SMCJ18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
SMCJ18AHE3_A/H from Vishay General Semiconductor is a unidirectional 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 standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V 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 power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ18AHE3_A/H datasheet, SMCJ18AHE3_A/H pinout, SMCJ18AHE3_A/H application, or SMCJ18AHE3_A/H equivalent, key selection criteria include AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.42), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 18 V), then rapidly avalanches below 22.1 V to divert surge energy away from downstream ICs. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive transients.
The device complies with ANSI/IEEE C62.35 for surge suppression, supports 200 A non-repetitive forward surge (IFSM), and exhibits a positive temperature coefficient of VBR (+0.092 %/°C), enabling predictable thermal derating up to TJ = 150 °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 1 mA - precise avalanche onset range defining protection threshold |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 1500 W surge, limiting stress on protected circuitry |
| PPPM | 1500 W - peak transient power handling capability with standard 10/1000 μs waveform |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| MSL Level | Level 1 per J-STD-020 - no floor life limitation; suitable for standard reflow without baking |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point for unidirectional clamping | Connected to protected line; conducts when voltage exceeds VBR relative to anode |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or lower-potential rail; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates risk of junction oxidation during reflow |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring extended reliability |
| Low incremental surge resistance | Minimizes VC rise under high di/dt surges, improving clamping precision for fast transients |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed industrial and automotive enclosures |
| Automated placement compatible | Standard SMC footprint and lead geometry support high-speed pick-and-place with >99.9% placement yield |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between VIN and GND to clamp transients before LDO or MCU input. Use Value: Clamps 1500 W surges to ≤29.2 V, preventing damage to 3.3 V/5 V logic supplies downstream. | Use Scenario: Analog output lines (e.g., 4–20 mA current loop) in factory automation sensors subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; this unidirectional part used on supply-rail side of signal conditioning stage. Use Value: Limits reverse polarity faults and fast transients while maintaining <1 μA leakage at 18 V standby. |
| Telecom DC Power Feeds | OBD-II Diagnostic Port Protection |
Use Scenario: +48 V telecom power distribution boards where lightning-induced surges threaten PoE controllers and PHYs. IC Role / Device Role / Timing Role: Primary-level TVS on main DC input rail upstream of DC/DC converters. Use Value: Withstands 200 A single half-sine surge (IFSM), providing first-line defense against high-energy events. | Use Scenario: OBD-II connector pins (pins 16/VBAT, 4/Chassis GND) exposed to accidental 24 V jump-start transients and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS between VBAT and chassis ground to absorb negative-going spikes. Use Value: AEC-Q101 qualification ensures compliance with automotive environmental stress testing protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18AHE3_A/H | Lower PPPM (600 W), same VWM/VBR/VC, smaller SMA package | Not rated for 1500 W surges; limited to lower-energy transients | Select when board space is constrained and peak surge energy is ≤600 W |
| SMCJ18AHM3_A/H | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No functional difference; required only for halogen-free BOM compliance | Select when halogen-free material content is mandated by OEM or regional regulation |
Compared with SMCJ18AHE3_A/H, SAC18AHE3_A/H trades surge capacity for compactness, while SMCJ18AHM3_A/H maintains full equivalence except for halogen-free construction - making the latter a drop-in replacement for green manufacturing, and the former a space-optimized alternative for less demanding surge profiles.
Availability
SMCJ18AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply, AEC-Q101 validation, and high-energy transient immunity.
Supply support for SMCJ18AHE3_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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade performance.
The SMCJ series is engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ISO 7637-2 and IEC 61000-4-5 threats is mandatory.
FAQ
What is the clamping voltage of SMCJ18AHE3_A/H at its rated peak pulse current?
The SMCJ18AHE3_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 the standard 10/1000 μs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected circuits downstream of the SMCJ18AHE3_A/H.
Is SMCJ18AHE3_A/H qualified for automotive use?
Yes, SMCJ18AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). This qualification confirms its suitability for automotive applications such as body control modules, infotainment power supplies, and ADAS sensor interfaces where long-term reliability under thermal and electrical stress is critical - a key attribute of the SMCJ18AHE3_A/H.
What does the "HE3" suffix indicate in SMCJ18AHE3_A/H?
The "HE3" suffix in SMCJ18AHE3_A/H denotes a RoHS-compliant, AEC-Q101 qualified version with matte tin-plated leads. The "H" indicates the packaging format (7″ tape and reel, 850 units), and "A/H" specifies the revision code per Vishay's ordering nomenclature. This distinguishes SMCJ18AHE3_A/H from commercial-grade variants like SMCJ18A-E3 and halogen-free alternatives like SMCJ18AHM3_A/H - all critical identifiers for correct SMCJ18AHE3_A/H procurement.
How does the thermal resistance of SMCJ18AHE3_A/H affect its power handling?
The SMCJ18AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout. At ambient temperatures above 25 °C, its 6.5 W steady-state power dissipation (PD) must be derated linearly - for example, at TA = 75 °C, usable PD drops to ~3.25 W. This thermal behavior directly constrains continuous leakage current and influences layout decisions, especially in sealed automotive enclosures where the SMCJ18AHE3_A/H may operate near its 150 °C TJ limit.
Can SMCJ18AHE3_A/H be used in bidirectional protection circuits?
No, SMCJ18AHE3_A/H is a unidirectional TVS diode, identifiable by its cathode band marking and specified breakdown only in reverse bias. For bidirectional protection, Vishay offers the SMCJ18CA series (e.g., SMCJ18CAHE3_A/H), which provides symmetrical clamping in both polarities. Using SMCJ18AHE3_A/H in a bidirectional configuration would leave the forward-biased direction unprotected - a critical design limitation that must be verified before implementing the SMCJ18AHE3_A/H in any AC-coupled or polarity-agnostic signal path.
SMCJ18AHE3_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:
- -
- 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_A/H FAQ
1.How can I place an order for SMCJ18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHE3_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 SMCJ18AHE3_A/H reliable?
The price and inventory of SMCJ18AHE3_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 SMCJ18AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHE3_A/H?
SMCJ18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHE3_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 SMCJ18AHE3_A/H?
For technical support, including SMCJ18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHE3_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 SMCJ18AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ18AHE3_A/H?
All SMCJ18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHE3_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 SMCJ18AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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