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Vishay General Semiconductor - Diodes Division 1.5SMC18A-E3/9AT
- Part No.:
- 1.5SMC18A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18A-E3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,807
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Product details
Overview
1.5SMC18A-E3/9AT 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 1500 W peak pulse power (10/1000 µs), 18 V breakdown voltage (VBR = 17.1–18.9 V at 1 mA), 15.3 V stand-off voltage (VWM), and clamps to ≤25.2 V at 59.5 A peak pulse current - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC18A-E3/9AT datasheet, 1.5SMC18A-E3/9AT pinout, 1.5SMC18A-E3/9AT application, or 1.5SMC18A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge capability, 15.3 V working voltage margin, RoHS-compliant matte tin plating, and AEC-Q101 qualification readiness via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance (<0.42 Ω typical), enabling fast response (<1.0 ns) to transient events like ESD, lightning-induced surges, and inductive switching spikes.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and TJ(max) = 150 °C. It supports repetitive surge duty cycles up to 0.01 % and meets J-STD-020 MSL Level 1 with 260 °C lead-free reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets safe DC rail margin for 12 V systems. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - tight 5% tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | ≤25.2 V at 59.5 A - clamping voltage limits downstream IC stress during 10/1000 µs transients. |
| PPPM | 1500 W - peak pulse power rating defines survivability against high-energy surges per IEC 61000-4-5. |
| IFSM | 200 A - 8.3 ms half-sine surge rating supports motor driver and relay coil suppression. |
| TJ range | −65 °C to +150 °C - wide junction temperature range enables under-hood automotive use. |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 3.2 mm min. cathode-to-anode creepage and 2.06 mm height. |
Pinout & Package
SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, cathode indicated by band marking on one end; terminals are anode and cathode - no internal circuitry or additional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased avalanche terminal | Connected to protected line; conducts when transient exceeds VWM, shunting surge to ground. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables single-device protection against severe IEC 61000-4-5 Level 4 surges without cascaded stages. |
| Glass-passivated junction | Ensures long-term VBR stability and low leakage (<1 µA at VWM) across temperature and lifetime. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets global environmental compliance requirements with matte tin terminations solderable per J-STD-002. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping, reducing stress on downstream 16 V-rated ICs. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor supply rail and ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤25.2 V, preserving integrity of 12 V nominal sensors and microcontrollers rated for 16 V absolute max. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Standoff protection element mounted directly at connector entry point, absorbing >1 kV/40 A transients per IEC 61000-4-4. Use Value: Maintains 15.3 V working margin above 24 V nominal, ensuring reliable operation while clamping to safe levels for optocoupler input stages. |
| Consumer Power Adapter Output | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering USB-C PD devices and IoT hubs. IC Role / Device Role / Timing Role: Fast-acting unidirectional suppressor on +5 V or +9 V output rail, responding ahead of LDO or DC/DC controller shutdown. Use Value: Prevents latch-up or gate oxide damage in connected SoCs by limiting surge peaks to ≤25.2 V with sub-nanosecond latency. |
Use Scenario: DC feed line protection in Ethernet-powered (PoE) line cards and base station control boards exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary-stage clamp on 48 V bias rail, coordinated with gas discharge tubes and series impedance for multi-level defense. Use Value: Handles 1500 W surge energy without degradation, maintaining 15.3 V standoff to avoid false triggering during normal 48 V PoE operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower PPPM (600 W), same VWM/VBR range, SMB (DO-214AA) package - 30% smaller footprint, lower thermal mass. | Best suited for space-constrained consumer electronics where 600 W surge immunity suffices. | Select SMBJ18A only if layout area is critical and surge threat level is limited to IEC 61000-4-2 ESD or low-energy transients. |
| 1.5KE18A | Through-hole TO-204AE (DO-41) package, identical electrical specs but higher RθJA (~100 °C/W); not SMT-compatible. | Used in legacy industrial controls or prototyping where manual assembly or high-reliability through-hole mounting is required. | Choose 1.5KE18A only when board assembly process prohibits SMT or when mechanical robustness outweighs density goals. |
Compared with SMBJ18A and 1.5KE18A, the 1.5SMC18A-E3/9AT delivers optimal balance of 1500 W surge capacity, SMC package manufacturability, and 15.3 V working voltage - making it preferred for high-reliability automotive and industrial SMT designs requiring full IEC 61000-4-5 compliance.
Availability
1.5SMC18A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC inputs, and telecom power rail safeguarding requiring stable component supply and consistent surge performance across production batches.
Supply support for 1.5SMC18A-E3/9AT 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 optimization.
The 1.5SMC Series was engineered for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact size, AEC-Q101 readiness, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC18A-E3/9AT at its rated peak pulse current?
The 1.5SMC18A-E3/9AT clamps to a maximum of 25.2 V at its rated peak pulse current of 59.5 A under a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuits during surge events. The 1.5SMC18A-E3/9AT maintains this clamping performance consistently due to its glass-passivated junction and low incremental resistance.
Is the 1.5SMC18A-E3/9AT RoHS-compliant and lead-free assembly compatible?
Yes, the 1.5SMC18A-E3/9AT carries the E3 suffix, indicating full RoHS compliance and qualification for lead-free reflow soldering per J-STD-020 MSL Level 1 with a maximum peak temperature of 260 °C. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and whisker resistance is certified to JESD 201 Class 2. The 1.5SMC18A-E3/9AT is designed for automated SMT lines without pre-bake requirements.
How does the 1.5SMC18A-E3/9AT differ from bidirectional variants like 1.5SMC18CA?
The 1.5SMC18A-E3/9AT is unidirectional, meaning it protects only against reverse-polarity transients on a DC line - with polarity marked by a cathode band. In contrast, 1.5SMC18CA is bidirectional and symmetrical, suitable for AC lines or data buses where voltage reversals occur. The 1.5SMC18A-E3/9AT has a lower VWM (15.3 V) than the 18CA's VWM (15.3 V per direction), but cannot clamp positive surges on grounded lines. Selection depends strictly on circuit topology and polarity requirements.
What is the maximum operating temperature and thermal resistance of the 1.5SMC18A-E3/9AT?
The 1.5SMC18A-E3/9AT has a maximum junction temperature (TJ(max)) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad layout. Derating begins above TA = 25 °C per Figure 2 in the datasheet, and power dissipation drops linearly to zero at 150 °C ambient. The 1.5SMC18A-E3/9AT sustains full 1500 W pulse rating only within this thermally managed configuration.
Can the 1.5SMC18A-E3/9AT be used in automotive applications?
The 1.5SMC18A-E3/9AT itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under HE3 and HM3 suffixes (e.g., 1.5SMC18AHE3_A). While the 1.5SMC18A-E3/9AT shares identical electrical and thermal specs, automotive deployment requires explicit AEC-Q101 validation - including extended temperature cycling, humidity testing, and failure analysis. For production automotive use, specify 1.5SMC18AHE3_A/9AT instead of the 1.5SMC18A-E3/9AT.
1.5SMC18A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC18A-E3/9AT FAQ
1.How can I place an order for 1.5SMC18A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18A-E3/9AT 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 1.5SMC18A-E3/9AT reliable?
The price and inventory of 1.5SMC18A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC18A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18A-E3/9AT?
1.5SMC18A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18A-E3/9AT 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 1.5SMC18A-E3/9AT?
For technical support, including 1.5SMC18A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC18A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18A-E3/9AT 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 1.5SMC18A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC18A-E3/9AT?
All 1.5SMC18A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18A-E3/9AT, 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 1.5SMC18A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC18A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18A-E3/9AT Tags
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