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Vishay General Semiconductor - Diodes Division 1.5SMC18AHE3/9AT
- Part No.:
- 1.5SMC18AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18AHE3/9AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,494
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Product details
Overview
1.5SMC18AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 18 V breakdown voltage (VBR min/max: 17.1–18.9 V), 15.3 V stand-off voltage (VWM), clamps to ≤25.2 V at 59.5 A peak pulse current (IPPM), and delivers 1500 W peak pulse power with 10/1000 μs waveform - used in automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the 1.5SMC18AHE3/9AT datasheet, 1.5SMC18AHE3/9AT pinout, 1.5SMC18AHE3/9AT application, or 1.5SMC18AHE3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, AEC-Q101 qualification status, and verified clamping performance under repetitive 0.01% duty cycle transients.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 15.3 V, it avalanches at VBR = 17.1–18.9 V (IT = 1 mA) and limits transient energy by diverting up to 59.5 A to ground while maintaining VC ≤ 25.2 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns).
Thermally rated for TJ = –65 °C to +150 °C, it exhibits RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and supports 200 A non-repetitive forward surge (8.3 ms half-sine). The HE3 suffix confirms RoHS-compliant construction and AEC-Q101 qualification per automotive reliability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at IT = 1 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | ≤25.2 V at 59.5 A (10/1000 μs) - clamping voltage determines protected circuit's maximum stress during surge |
| PPPM | 1500 W - peak transient power handling capacity under standardized surge waveform |
| IFSM | 200 A - single half-sine surge rating (8.3 ms), critical for inductive switch-off protection |
| TJ max | +150 °C - enables operation in under-hood automotive and high-ambient industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line ground or low-side reference | Must be tied to system ground or return path to enable clamping action during reverse overvoltage events |
| Cathode | Current exit point in forward bias; marked with band; connected to protected line | Connected to the line being protected (e.g., 12 V rail, CAN_H, sensor supply); conducts avalanche current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against severe lightning-induced surges and inductive kickback without thermal runaway |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, EFT), improving protection margin |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between sensor signal line and chassis ground. Use Value: Clamps transients to ≤25.2 V, preserving ADC input integrity and preventing microcontroller reset or latch-up. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on discrete optocoupler input stage. Use Value: Absorbs 1500 W surges without degradation, enabling >100,000 switching cycles per channel per IEC 61000-4-5 compliance. |
| DC Power Rail Protection | Telecom Line Interface |
Use Scenario: Secondary surge suppression on 12–24 V DC power distribution boards downstream of primary MOV-based protection. IC Role / Device Role / Timing Role: Fast-response secondary clamp parallel to bulk capacitance and upstream filter inductors. Use Value: Responds in <1 ns to limit voltage overshoot below IC absolute maximum ratings during fast-edge transients. |
Use Scenario: Protecting RS-485 transceiver pins (e.g., MAX1487) in outdoor telecom cabinets subjected to induced lightning surges. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC-supply side and data line pairs referenced to local ground. Use Value: Maintains signal integrity by limiting clamping voltage to 25.2 V while surviving repeated 10/1000 μs surges per ITU-T K.21. |
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-E3/57T | Same VBR/VC, but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy transients; unsuitable for automotive load dump or IEC 61000-4-5 Level 3+ | Select only for space-constrained consumer electronics where 400 W surge margin suffices. |
| 1.5KE18A | Through-hole DO-201 package; identical electrical specs but no AEC-Q101 qualification; higher mounting inductance | Not suitable for automated SMT production or automotive vibration environments; requires wave soldering | Choose only for legacy through-hole designs or prototyping where SMT assembly is unavailable. |
Compared with SMAJ18A-E3/57T and 1.5KE18A, the 1.5SMC18AHE3/9AT uniquely combines 1500 W surge capability, AEC-Q101 qualification, and SMC package manufacturability - making it the only option qualified for volume automotive SMT production requiring full ISO 16750-2 compliance.
Availability
1.5SMC18AHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line interface circuits requiring stable component supply, AEC-Q101 traceability, and 13" tape-and-reel delivery for high-volume SMT placement.
Supply support for 1.5SMC18AHE3/9AT 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 transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through robust, qualified, and repeatable clamping performance.
FAQ
What is the clamping voltage of the 1.5SMC18AHE3/9AT under a 10/1000 μs surge?
The 1.5SMC18AHE3/9AT clamps to a maximum of 25.2 V when subjected to its rated peak pulse current of 59.5 A using the standardized 10/1000 μs waveform. This value is measured across the device terminals with specified test conditions (mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on the protected circuit during surge events. The 1.5SMC18AHE3/9AT maintains this clamping performance consistently across its qualified operating temperature range.
Is the 1.5SMC18AHE3/9AT qualified for automotive applications?
Yes, the 1.5SMC18AHE3/9AT carries the HE3 suffix, which explicitly denotes RoHS-compliant construction and full AEC-Q101 qualification. It has passed stress tests including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge per JESD22-A114 - validating its suitability for under-hood and body-control module applications. The 1.5SMC18AHE3/9AT is not a generic commercial part; its qualification data is documented in Vishay's certified test reports.
What does the "HE3/9AT" suffix mean in 1.5SMC18AHE3/9AT?
The "HE3" suffix indicates RoHS-compliant materials and AEC-Q101 qualification; "9AT" specifies packaging in a 13-inch diameter plastic tape-and-reel format containing 3500 units. This differs from "57T" (7-inch reel, 850 units) and confirms the part meets automotive traceability and logistics requirements. The 1.5SMC18AHE3/9AT is not interchangeable with non-HE3 variants in automotive production due to missing qualification evidence.
How does the 1.5SMC18AHE3/9AT compare to bidirectional TVS diodes like 1.5SMC18CA?
The 1.5SMC18AHE3/9AT is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground), offering tighter VBR tolerance and lower leakage than bidirectional equivalents. In contrast, 1.5SMC18CA protects AC or polarity-agnostic lines (e.g., data buses) but exhibits higher leakage above VWM in both directions. The 1.5SMC18AHE3/9AT cannot replace 1.5SMC18CA in AC-coupled applications without circuit redesign.
What is the maximum printed circuit board pad size recommended for thermal performance of the 1.5SMC18AHE3/9AT?
Vishay specifies a minimum pad layout of 0.31" × 0.31" (8.0 mm × 8.0 mm) copper area per terminal to achieve the published thermal resistance RθJA = 75 °C/W and sustain full 1500 W pulse power. Reducing pad size increases junction temperature rise during surge events and may cause premature failure. The 1.5SMC18AHE3/9AT datasheet provides exact dimensional drawings for SMC (DO-214AB) land patterns to ensure compliance.
1.5SMC18AHE3/9AT 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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC18AHE3/9AT FAQ
1.How can I place an order for 1.5SMC18AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18AHE3/9AT 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 1.5SMC18AHE3/9AT reliable?
The price and inventory of 1.5SMC18AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18AHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC18AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18AHE3/9AT?
1.5SMC18AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18AHE3/9AT 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 1.5SMC18AHE3/9AT?
For technical support, including 1.5SMC18AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18AHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC18AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18AHE3/9AT 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 1.5SMC18AHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC18AHE3/9AT?
All 1.5SMC18AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18AHE3/9AT, 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 1.5SMC18AHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC18AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18AHE3/9AT Tags
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