My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ18AHE3_A/I
- Part No.:
- SMCJ18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18AHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,001
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ18AHE3_A/I 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 stand-off voltage (VWM), 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 electronics, industrial sensor interfaces, and telecom front-end protection.
For engineers reviewing the SMCJ18AHE3_A/I datasheet, SMCJ18AHE3_A/I pinout, SMCJ18AHE3_A/I application, or SMCJ18AHE3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, low incremental surge resistance, glass-passivated junction, and MSL Level 1 moisture sensitivity rating for high-reliability surface-mount assembly.
Technical Context
The SMCJ18AHE3_A/I operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 20.0–22.1 V breakdown range (VBR at 1 mA). Its clamping action limits transients to ≤29.2 V under 51.4 A surge, enabling protection of downstream MOSFETs, ICs, and microcontrollers against inductive switching spikes and ESD events.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W. The matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and the device is qualified per AEC-Q101 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - precise avalanche onset range ensures predictable turn-on |
| VC @ IPPM | 29.2 V at 51.4 A - clamping voltage defines worst-case stress on protected circuitry |
| PPPM | 1500 W - peak transient energy handling capability with 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves efficiency in battery-powered or high-impedance circuits |
| TJ max | +150 °C - enables deployment in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
SMCJ18AHE3_A/I uses the SMC (DO-214AB) package: a molded plastic case with two terminals, cathode marked by a band. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground during overvoltage |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity |
| MSL Level 1 (260 °C peak) | Enables standard reflow assembly without pre-baking; compatible with automated SMT lines |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for sensitive ICs |
| 1500 W peak pulse power | Handles high-energy surges from load dump or inductive kick without degradation |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from ISO 7637-2 load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 22.1 V. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding 4–20 mA current loop inputs in PLC analog modules from field wiring surges. IC Role / Device Role / Timing Role: TVS connected across input terminals to shunt induced transients before reaching op-amp front-end. Use Value: 1.0 µA leakage avoids measurement error; 1500 W rating withstands repeated 1 kV/50 Ω surge events. |
| Telecom Line Card Surge Protection | DC Motor Drive Control Board Protection |
Use Scenario: Shielding Ethernet PHY power pins and bias rails from lightning-induced surges on PoE-enabled line cards. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3 V/5 V supply rails to absorb coupled transients from magnetics or connectors. Use Value: 29.2 V clamping prevents latch-up in PHY ICs; DO-214AB footprint allows dense layout near connectors. | Use Scenario: Suppressing back-EMF spikes generated by brushed DC motor commutation in robotics drive boards. IC Role / Device Role / Timing Role: TVS mounted across motor terminals or H-bridge supply rails to clamp inductive kick. Use Value: 51.4 A IPPM handles typical motor stall currents; glass passivation ensures longevity under cyclic stress. |
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/I | Lower PPPM (400 W), smaller SMA package, same VWM/VBR/VC specs | Not suitable for 1500 W surge events; limited to lower-energy transients | Select only when board space is constrained and surge energy is ≤400 W |
| SMCJ18AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical and thermal specs | No functional difference; used where halogen-free compliance is mandated | Drop-in replacement when halogen-free material specification applies |
Compared with SMCJ18AHE3_A/I, SMAJ18AHE3_A/I offers space savings but sacrifices 73% surge power handling; SMCJ18AHM3_A/I provides identical protection performance with halogen-free construction - making the HE3 version optimal for general AEC-Q101 automotive use, while HM3 serves regulated green manufacturing.
Availability
SMCJ18AHE3_A/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and telecom line card designs requiring stable component supply, AEC-Q101 qualification, and high-energy transient immunity.
Supply support for SMCJ18AHE3_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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade validation.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, high-reliability transient suppression in harsh environments - targeting automotive, industrial, and infrastructure applications where surge immunity is mission-critical.
FAQ
What is the clamping voltage of the SMCJ18AHE3_A/I under maximum rated surge current?
The SMCJ18AHE3_A/I 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 at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 3.3 V, 5 V, or 12 V IC supply rails.
Is the SMCJ18AHE3_A/I qualified for automotive applications?
Yes, the SMCJ18AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101–qualified variants. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating its suitability for under-hood and body-control module deployments where SMCJ18AHE3_A/I must operate reliably from –55 °C to +150 °C.
What is the meaning of the "_A/I" suffix in SMCJ18AHE3_A/I?
The "_A/I" suffix in SMCJ18AHE3_A/I indicates the revision level ("A") and packaging format ("I" = 13-inch diameter plastic tape and reel, 3500 units per reel). This matches Vishay's documented ordering convention where "I" denotes high-volume reel delivery, distinct from "H" (7-inch reel, 850 units). The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification - all attributes verified in the official Vishay datasheet document 88394.
How does the SMCJ18AHE3_A/I differ from bidirectional versions like SMCJ18CA?
The SMCJ18AHE3_A/I is unidirectional, with polarity indicated by a cathode band and intended for DC rail protection where reverse conduction is not required. In contrast, SMCJ18CA is bidirectional, symmetric in both directions, and used in AC-coupled or floating signal line applications. Their VWM (18 V), VBR (20.0–22.1 V), and VC (29.2 V) match, but SMCJ18AHE3_A/I cannot replace SMCJ18CA in AC paths without circuit redesign due to inherent polarity dependence.
What thermal design considerations apply to the SMCJ18AHE3_A/I in PCB layout?
For full 1500 W surge rating, the SMCJ18AHE3_A/I must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Its RθJA is 75 °C/W, so thermal relief traces or undersized pads will cause excessive junction temperature rise during repeated surges. Use solid inner-layer copper pours connected via multiple thermal vias to maximize heat spreading - especially critical in automotive modules where ambient temperatures exceed 85 °C.
SMCJ18AHE3_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:
- -
- 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/I FAQ
1.How can I place an order for SMCJ18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18AHE3_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 SMCJ18AHE3_A/I reliable?
The price and inventory of SMCJ18AHE3_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 SMCJ18AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18AHE3_A/I?
SMCJ18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18AHE3_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 SMCJ18AHE3_A/I?
For technical support, including SMCJ18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ18AHE3_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 SMCJ18AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ18AHE3_A/I?
All SMCJ18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18AHE3_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 SMCJ18AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18AHE3_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 …
