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Vishay General Semiconductor - Diodes Division 1.5SMC18A-E3/57T
- Part No.:
- 1.5SMC18A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18A-E3/57T.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
1.5SMC18A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR at 1 mA), and clamps to ≤25.2 V at 59.5 A peak pulse current - deployed for overvoltage protection of DC power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the 1.5SMC18A-E3/57T datasheet, 1.5SMC18A-E3/57T pinout, 1.5SMC18A-E3/57T application, or 1.5SMC18A-E3/57T equivalent, key selection criteria include unidirectional polarity, 25.2 V clamping performance under 59.5 A surge, RoHS-compliant matte tin terminations, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 15.3 V and rapidly transitions to low-impedance conduction above its 17.1–18.9 V breakdown threshold, limiting transient-induced voltage excursions to ≤25.2 V during 10/1000 μs surges. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable breakdown behavior across temperature.
Designed for unidirectional DC line protection, it features cathode-band polarity marking, 75 °C/W junction-to-ambient thermal resistance, and 150 °C maximum junction temperature - enabling reliable operation in thermally constrained PCB layouts without active cooling when derated per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15.3 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 17.1 V / 18.9 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during transients; tight 10% tolerance supports precise protection thresholds. |
| VC @ IPPM | ≤25.2 V at 59.5 A - Clamping voltage under full 1500 W surge; determines worst-case overvoltage seen by downstream ICs or MOSFETs. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; validates robustness against lightning-induced or inductive-switching transients. |
| IPPM | 59.5 A - Peak pulse current capability; directly correlates with surge energy absorption (E ≈ 1.5 kJ × tp/tw). |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and industrial enclosures without forced airflow. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 0.305" × 0.320" footprint and 0.126" height; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line (e.g., GND or return path); not used in reverse-biased protection mode. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to higher-potential side (e.g., +12 V rail); carries full surge current during transient events; marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity testing without external series impedance. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage current over 1000+ surge cycles and 15-year field life. |
| MSL Level 1 (260 °C peak reflow) | Permits single-pass lead-free reflow soldering without popcorn cracking or delamination risks. |
| AEC-Q101 qualified option available | Enables drop-in qualification for automotive applications requiring stress-tested reliability (e.g., body control modules). |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin for high-speed logic. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VIN and GND, activated within <1 ns of overvoltage onset. Use Value: Limits transient voltage to ≤25.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V MCUs downstream of LDO regulators. |
Use Scenario: Safeguarding analog outputs (0–10 V, 4–20 mA) of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Reverse-biased TVS shunting induced surges on sensor output traces before reaching ADC input stages. Use Value: Maintains signal integrity by clamping ESD (IEC 61000-4-2 ±8 kV contact) and burst noise (IEC 61000-4-4 ±2 kV) to sub-26 V levels. |
| Consumer USB Power Delivery Protection | Telecom DC Feeder Line Protection |
Use Scenario: Secondary overvoltage guard on 5 V USB-C power paths in smart home hubs after primary fuse and PTC. IC Role / Device Role / Timing Role: Fast-response TVS absorbing hot-swap and cable-insertion transients before reaching USB PD controller ICs. Use Value: Withstands ≥59.5 A pulses while holding clamp voltage below 25.2 V - preserving USB BC1.2 compliance and port enumeration reliability. |
Use Scenario: Protecting -48 V DC telecom feeder lines entering base station cabinets from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-GND, cathode-to-line, suppressing differential-mode spikes on powered Ethernet or remote radio heads. Use Value: Delivers 1500 W surge capacity with <100 ps response, meeting Telcordia GR-1089-CORE Zone 3 requirements for central office equipment. |
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 | Same VWM (15.3 V) and VC (25.2 V), but lower PPPM = 600 W in smaller SMB package; 40% lower surge current rating (24.7 A). | Better suited for space-constrained consumer electronics where 600 W surge margin suffices; not recommended for automotive load dump. | Select SMBJ18A only if board area is critical and surge threat level is limited to IEC 61000-4-2 ESD or low-energy bursts. |
| 1.5KE18A | Through-hole TO-204AA (DO-41) package; identical electrical specs (VWM, VBR, VC, PPPM) but incompatible with SMT assembly and higher thermal resistance (RθJA = 100 °C/W). | Used in legacy industrial power supplies where manual assembly or high-reliability through-hole mounting is mandated. | Choose 1.5KE18A only for retrofit designs requiring pin-for-pin replacement of existing DO-41 TVS devices without PCB redesign. |
Compared with SMBJ18A and 1.5KE18A, the 1.5SMC18A-E3/57T delivers optimal balance of 1500 W surge capacity, SMT manufacturability, and thermal performance in compact SMC packaging - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101-ready, high-power transient suppression.
Availability
1.5SMC18A-E3/57T is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and telecom DC feeder line safeguarding requiring stable component supply, RoHS compliance, and traceable sourcing.
Supply support for 1.5SMC18A-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, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The 1.5SMC Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping performance, AEC-Q101 qualification, and SMT scalability are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5SMC18A-E3/57T under full-rated surge conditions?
The 1.5SMC18A-E3/57T clamps to a maximum of 25.2 V when subjected to its full 1500 W peak pulse power (10/1000 μs waveform) at 59.5 A. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and represents the worst-case overvoltage imposed on protected circuitry during surge events - critical for validating MCU or sensor IC survival margins.
Is the 1.5SMC18A-E3/57T RoHS-compliant and halogen-free?
Yes, the 1.5SMC18A-E3/57T carries the "E3" suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 6a, with no intentionally added halogens. Its molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Does the 1.5SMC18A-E3/57T meet AEC-Q101 qualification requirements?
No - the 1.5SMC18A-E3/57T is commercial-grade. For AEC-Q101 qualification, select the automotive variant 1.5SMC18AHE3_A (with "HE3" suffix and revision code), which undergoes stress testing per AEC-Q101-004 (HTRB), AEC-Q101-005 (HTGB), and AEC-Q101-007 (TCT) standards.
What is the thermal resistance and maximum junction temperature of the 1.5SMC18A-E3/57T?
The 1.5SMC18A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended pad layout, and a maximum junction temperature (TJ) of +150 °C. These values define its safe operating area under sustained power dissipation and ensure reliability in ambient temperatures up to +105 °C when properly derated per Figure 2 of the datasheet.
How does the 1.5SMC18A-E3/57T differ from bidirectional variants like 1.5SMC18CA?
The 1.5SMC18A-E3/57T is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, 1.5SMC18CA is bidirectional, symmetric in both directions, and used for AC signal or data line protection - it lacks polarity marking and exhibits identical VBR and VC in positive and negative quadrants.
1.5SMC18A-E3/57T 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-E3/57T FAQ
1.How can I place an order for 1.5SMC18A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18A-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 1.5SMC18A-E3/57T reliable?
The price and inventory of 1.5SMC18A-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 1.5SMC18A-E3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC18A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18A-E3/57T?
1.5SMC18A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18A-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 1.5SMC18A-E3/57T?
For technical support, including 1.5SMC18A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18A-E3/57T requirements.
6.How does Aetrix verify that 1.5SMC18A-E3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18A-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 1.5SMC18A-E3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC18A-E3/57T?
All 1.5SMC18A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18A-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 1.5SMC18A-E3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC18A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18A-E3/57T Tags
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