My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ18-E3/57T
- Part No.:
- SMCJ18-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18-E3/57T.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,840
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ18-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 29.2 V clamping voltage (VC) at 51.4 A peak pulse current, and 1500 W peak pulse power dissipation with 10/1000 µs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients.
For engineers reviewing the SMCJ18-E3/57T datasheet, SMCJ18-E3/57T pinout, SMCJ18-E3/57T application, or SMCJ18-E3/57T equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant packaging, and real-world use context for automotive, industrial, and telecom surge protection design.
Technical Context
The SMCJ18-E3/57T operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (20.0–22.1 V at 1 mA test current). Its glass-passivated junction ensures stable clamping performance under repetitive surge stress, with low incremental surge resistance enabling consistent voltage limiting during fast 10/1000 µs transients.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJL = 15 °C/W (junction-to-lead) and derated power dissipation above 25 °C ambient per Fig. 2. The device meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 15–18 V rail protection. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 1500 W - peak pulse power handling capability; enables survival of high-energy transients like ISO 7637-2 Pulse 1/2a/5a in automotive systems. |
| ID @ VWM | 1.0 µA - ultra-low leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance sensing paths. |
| TJ max. | +150 °C - maximum junction temperature rating; supports operation in under-hood automotive environments and enclosed industrial enclosures. |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end; cathode is the banded terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during forward-biased ESD events or fault conditions. |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., 12 V supply or CAN_H); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics, ensuring long-term reliability under thermal cycling and vibration stress. |
| Glass-passivated junction | Enhances long-term stability of VBR and leakage performance across humidity, temperature, and aging conditions - critical for field-deployed industrial systems. |
| MSL Level 1 rating | Enables standard reflow assembly without moisture sensitivity concerns; no baking required prior to PCB mounting. |
| Low incremental surge resistance | Minimizes VC rise under high-current surges, preserving tighter clamping margins than standard Zener-based protectors. |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU; lead-free matte tin plating ensures compatibility with Pb-free soldering processes and environmental compliance programs. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges >24 V while remaining inert below 18 V. Use Value: Limits peak voltage to ≤29.2 V during 1500 W transients, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) TVS connected across signal and return, activated only during >20 V transients. Use Value: Preserves signal integrity with negligible DC loading; clamps sub-100 ns ESD events without affecting 1 kHz sensor bandwidth. |
| Telecom Interface Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding RS-485 transceiver I/O pins in base station backhaul modules exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable layout (though SMCJ18-E3/57T is unidirectional, used in polarity-aware configurations) with low capacitance and fast response. Use Value: Withstands repeated 10/1000 µs surges up to 51.4 A while maintaining <30 V clamping - within RS-485 common-mode tolerance. |
Use Scenario: Overvoltage protection on VBUS line of USB 2.0 host ports in smart home hubs subjected to hot-plug and adapter faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND to absorb 1500 W surges from faulty chargers or cable shorts. Use Value: Clamps VBUS to 29.2 V before USB PHY ICs (rated to 30 V abs max) sustain permanent damage; passes IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (~110 °C/W), same VWM/VBR/VC specs. | Suitable for space-constrained consumer designs with lower surge threat levels; not recommended for automotive load dump. | Select SMAJ18A-E3/61T only if board area is critical and surge energy remains below 400 W. |
| SMCJ18AHE3/57T | Identical electrical specs and package, but AEC-Q101 qualified (HE3 suffix) vs. commercial-grade E3; same 1500 W PPPM and 29.2 V VC. | Required for automotive OEM designs needing full qualification documentation and traceability; otherwise functionally interchangeable. | Choose SMCJ18AHE3/57T when AEC-Q101 compliance is mandated; SMCJ18-E3/57T suffices for industrial/commercial use. |
Compared with SMAJ18A-E3/61T, the SMCJ18-E3/57T delivers 3.75× higher surge power handling and superior thermal performance; versus SMCJ18AHE3/57T, it offers identical protection capability at lower cost where automotive qualification is unnecessary.
Availability
SMCJ18-E3/57T is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom equipment surge resilience requiring stable component supply and full traceability.
Supply support for SMCJ18-E3/57T 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 optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and infrastructure applications demanding AEC-Q101 or extended thermal endurance.
FAQ
What is the clamping voltage of the SMCJ18-E3/57T and how is it measured?
The SMCJ18-E3/57T has a maximum clamping voltage (VC) of 29.2 V, measured at a peak pulse current (IPPM) of 51.4 A using the standardized 10/1000 µs double-exponential waveform per ANSI/IEEE C62.35. This value represents the highest voltage the device allows across its terminals during a defined surge event, directly protecting downstream components from overvoltage stress. The SMCJ18-E3/57T maintains this clamping performance consistently across its rated temperature range.
Is the SMCJ18-E3/57T suitable for automotive applications?
The SMCJ18-E3/57T is RoHS-compliant and built in an AEC-Q101-qualified platform, but the E3 suffix denotes commercial-grade qualification. For full automotive compliance, Vishay specifies the HE3-suffix variant (e.g., SMCJ18AHE3/57T). While the SMCJ18-E3/57T shares identical electrical specs and thermal performance, it lacks the extended test documentation required by Tier 1 OEMs - making it appropriate for non-safety-critical automotive subsystems or industrial equivalents.
How does the SMCJ18-E3/57T differ from bi-directional TVS diodes like SMCJ18CA?
The SMCJ18-E3/57T is unidirectional and functions only during reverse-voltage transients, with a cathode band marking polarity. In contrast, SMCJ18CA is bi-directional and suppresses surges of either polarity - useful for AC lines or differential buses like RS-485. The SMCJ18-E3/57T offers lower leakage (<1.0 µA) and slightly tighter VBR tolerance than its CA counterpart, but cannot replace it in symmetric-clamping applications without circuit redesign.
What is the thermal resistance and how does it affect PCB layout for the SMCJ18-E3/57T?
The SMCJ18-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under repeated surges, PCB layout must provide adequate copper area and minimize thermal isolation. Reducing pad size or using thin FR-4 increases RθJA, risking thermal runaway during multi-pulse events - always follow Vishay's recommended mounting footprint in Doc. 88394.
Can the SMCJ18-E3/57T be used in parallel for higher surge current handling?
No - the SMCJ18-E3/57T is not characterized or recommended for parallel operation. Minor VBR mismatches between units cause current imbalance, leading to premature failure of the lower-VBR device. For higher surge ratings, select a single higher-power TVS (e.g., SMCJ22A or SMCJ24A) or implement staged protection with upstream fusing. Vishay does not specify matching tolerances or derating guidance for paralleling SMCJ18-E3/57T units.
SMCJ18-E3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 46.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ18-E3/57T FAQ
1.How can I place an order for SMCJ18-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18-E3/57T 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 SMCJ18-E3/57T reliable?
The price and inventory of SMCJ18-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18-E3/57T?
SMCJ18-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18-E3/57T 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 SMCJ18-E3/57T?
For technical support, including SMCJ18-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18-E3/57T requirements.
6.How does Aetrix verify that SMCJ18-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18-E3/57T 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 SMCJ18-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18-E3/57T?
All SMCJ18-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18-E3/57T, 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 SMCJ18-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ18-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18-E3/57T 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 …
