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Vishay General Semiconductor - Diodes Division 1.5SMC18AHE3_A/H
- Part No.:
- 1.5SMC18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18AHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,560
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Product details
Overview
1.5SMC18AHE3_A/H 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 17.1 V to 18.9 V breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 25.2 V clamping voltage (VC) at 59.5 A peak pulse current, and 1500 W peak pulse power capability with 10/1000 μs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom power supplies.
For engineers reviewing the 1.5SMC18AHE3_A/H datasheet, 1.5SMC18AHE3_A/H pinout, 1.5SMC18AHE3_A/H application, or 1.5SMC18AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, 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 transitions from high-impedance standby to low-impedance conduction when reverse voltage exceeds VBR, limiting transient energy to protected circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
The 1.5SMC18AHE3_A/H is rated for non-repetitive 10/1000 μs surges only, with thermal derating above 25 °C ambient per Fig. 2, and requires mounting on specified 0.31" × 0.31" copper pads for full 1500 W rating. It is not intended for continuous forward conduction - forward surge rating (IFSM = 200 A, 8.3 ms half-sine) applies only to rare fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA test current - defines precise clamping onset threshold under controlled conditions |
| VWM | 15.3 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 25.2 V at 59.5 A - clamped voltage during 1500 W transient, directly limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform, validated on 8.0 mm × 8.0 mm copper pads |
| IPPM | 59.5 A - maximum non-repetitive peak pulse current the device safely clamps without failure |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
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 | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., ground or return path); determines direction of clamping action |
| Cathode | Clamping output / Surge sink node | Connected to protected line (e.g., 12 V rail); conducts surge current to anode during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control, body electronics, and ADAS sensors |
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 μA), and long-term parameter stability |
| MSL Level 1 (260 °C) | Supports standard lead-free reflow without preconditioning, reducing manufacturing complexity |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping, improving margin for 16 V-rated downstream components |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and input filter capacitor. Use Value: Limits voltage to ≤25.2 V during 1500 W transients, preventing damage to LDOs and microcontrollers rated for 28 V absolute max. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure or temperature transducers) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Point-of-entry TVS on 3.3 V or 5 V signal lines, mounted adjacent to connector. Use Value: Sub-1 ns response and <1 μA leakage preserve signal integrity while meeting IEC 61000-4-2 Level 4 (15 kV air) requirements. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 48 V DC input stages in PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter input stage. Use Value: Withstands repetitive 10/1000 μs surges at 0.01 % duty cycle, supporting EN 61000-4-5 compliance for telecom infrastructure. |
Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable audio devices and smart home hubs. IC Role / Device Role / Timing Role: Secondary TVS after primary fuse and common-mode choke, placed near USB connector. Use Value: Low capacitance (typ. 150 pF at 0 V) avoids USB 2.0 signal degradation while clamping lightning-induced surges to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same VWM (15.3 V), but lower PPPM (400 W), smaller SMA package (DO-214AC), no AEC-Q101 qualification | Limited to consumer or non-automotive industrial use; insufficient for ISO 7637-2 Pulse 5a | Select when cost and board space are prioritized over automotive-grade surge rating and qualification. |
| 1.5KE18A | Through-hole TO-204AA (DO-41) package, same VBR range, 1500 W rating, but no AEC-Q101 or MSL Level 1 | Requires wave soldering; unsuitable for fully SMT production or high-reliability automotive PCBs | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMAJ18A and 1.5KE18A, the 1.5SMC18AHE3_A/H uniquely combines AEC-Q101 qualification, SMT-ready SMC packaging, and full 1500 W clamping performance - making it the only option qualified for volume automotive production with zero layout compromise.
Availability
1.5SMC18AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial I/O protection, and telecom power input circuits requiring stable component supply, AEC-Q101 traceability, and consistent 1500 W surge handling across production batches.
Supply support for 1.5SMC18AHE3_A/H 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-power transient suppression in harsh environments, emphasizing AEC-Q101 qualification, stable clamping, and SMT manufacturability - targeting automotive power distribution and industrial control systems.
FAQ
What is the clamping voltage of the 1.5SMC18AHE3_A/H under maximum rated surge current?
The 1.5SMC18AHE3_A/H clamps to 25.2 V at its maximum rated peak pulse current of 59.5 A (10/1000 μs waveform). This value is measured under standardized test conditions with the device mounted on 0.31" × 0.31" copper pads per JEDEC standards and represents the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 1.5SMC18AHE3_A/H suitable for bidirectional transient protection?
No, the 1.5SMC18AHE3_A/H is a unidirectional TVS diode - its cathode band indicates polarity, and it conducts only in reverse bias. For bidirectional protection, Vishay offers the 1.5SMC18CA variant. Using the 1.5SMC18AHE3_A/H in bidirectional configurations risks forward conduction and failure during positive transients.
Does the 1.5SMC18AHE3_A/H require derating at elevated ambient temperatures?
Yes, the 1.5SMC18AHE3_A/H must be derated above 25 °C ambient per Figure 2 in the datasheet. Its peak pulse power capability decreases linearly to zero at +150 °C junction temperature, and sustained operation above 125 °C ambient requires thermal modeling to ensure TJ remains within the 150 °C limit under worst-case surge duty cycles.
What does the "HE3_A/H" suffix signify in 1.5SMC18AHE3_A/H?
The "HE3" denotes RoHS-compliant and AEC-Q101-qualified construction; "A" indicates the device belongs to the 6.8 V–220 V unidirectional voltage range; "H" specifies 7-inch tape-and-reel packaging with 850 units per reel. This full suffix confirms automotive-grade qualification, environmental compliance, and production-ready packaging format for SMT lines.
Can the 1.5SMC18AHE3_A/H replace older 1.5KE18A parts in existing designs?
Electrically, the 1.5SMC18AHE3_A/H matches the 1.5KE18A's VBR and PPPM ratings, but it is not a drop-in replacement due to its SMC (DO-214AB) surface-mount package versus the 1.5KE18A's through-hole DO-41 case. PCB redesign is required, though the 1.5SMC18AHE3_A/H offers superior manufacturability, AEC-Q101 qualification, and MSL Level 1 reflow compatibility.
1.5SMC18AHE3_A/H 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:
- -
- 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_A/H FAQ
1.How can I place an order for 1.5SMC18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18AHE3_A/H 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_A/H reliable?
The price and inventory of 1.5SMC18AHE3_A/H 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_A/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18AHE3_A/H?
1.5SMC18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18AHE3_A/H 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_A/H?
For technical support, including 1.5SMC18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18AHE3_A/H requirements.
6.How does Aetrix verify that 1.5SMC18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18AHE3_A/H 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_A/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC18AHE3_A/H?
All 1.5SMC18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18AHE3_A/H, 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_A/H part is unused and in its original packaging.
Return procedure for 1.5SMC18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18AHE3_A/H Tags
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