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onsemi 1.5SMC9.1AT3
- Part No.:
- 1.5SMC9.1AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC9.1AT3.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,253
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Product details
Overview
1.5SMC9.1AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of DC power rails and signal lines. It features a 7.78 V working peak reverse voltage (VRWM), 9.1 V nominal breakdown voltage (VBR) at 1 mA, 13.4 V maximum clamping voltage (VC) at 112 A peak pulse current (IPP), and <1 ns response time - deployed in automotive power supplies, industrial PLC I/O modules, and medical equipment surge interfaces.
For engineers reviewing the 1.5SMC9.1AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, VC vs. protected IC absolute maximum rating, IPP capability under system-level surge waveforms (e.g., ISO 7637-2 Pulse 5a), and UL 497B recognition for isolated loop protection compliance.
Technical Context
The 1.5SMC9.1AT3 operates as a silicon avalanche diode with sharp Zener breakdown characteristics, triggered when reverse voltage exceeds VBR (9.1 V ±5%). Its low dynamic impedance (<0.11 Ω derived from ΔVBR/ΔI) ensures stable clamping during 10/1000 µs transients. The device exhibits a positive temperature coefficient of VBR (+0.068 %/°C), enabling predictable voltage drift over –65°C to +150°C junction range.
It is rated for 1500 W non-repetitive peak pulse power (1 ms, 10×1000 µs waveform), with thermal derating to 750 W at TA = 75°C and full derating above 125°C ambient. The SMC package provides 54.6 °C/W junction-to-lead thermal resistance, supporting high-energy surge dissipation without external heatsinking in short-duration events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 7.78 V - maximum continuous reverse operating voltage before clamping begins; must exceed circuit's peak DC or AC rectified voltage. |
| VBR @ IT=1 mA | 9.1 V (nominal), 8.65–9.55 V (min–max) - precise Zener breakdown threshold defining turn-on sensitivity. |
| VC @ IPP=112 A | 13.4 V - maximum clamped voltage seen by protected circuit during worst-case 10/1000 µs surge. |
| IPP | 112 A - peak pulse current the device safely shunts while maintaining VC ≤13.4 V. |
| IR @ VRWM | 50 µA - leakage current at 7.78 V reverse bias; low enough to avoid loading sensitive 5 V or 3.3 V logic rails. |
| Response Time | <1 ns - enables suppression of fast-rising ESD and lightning-induced transients before downstream ICs are damaged. |
| UL Recognition | UL 497B (QVGV2 File #116110) - certified for isolated loop circuit protection, including strike voltage, endurance, and dielectric withstand tests. |
Pinout & Package
1.5SMC9.1AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a molded polarity notch indicating the cathode terminal. The package measures 7.75 × 6.10 × 2.41 mm (L × W × H) with modified L-bend leads for enhanced solder pad contact area and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference node in unidirectional TVS configuration | Connected to system ground or low-impedance return path; forms current sink during transient clamp event. |
| Cathode | Protected line input node | Connected to the rail or signal line requiring protection (e.g., +12 V supply); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W Peak Pulse Power | Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) and ISO 7637-2 Pulse 5a (75 V/12 Ω) surge immunity without derating. |
| UL 497B Certification | Validated for use in safety-critical isolated loop circuits (e.g., 4–20 mA sensor interfaces), eliminating need for separate certification testing. |
| ESD Robustness | Class 3 HBM (>16 kV) - protects against human-body model discharges common in manufacturing and field service environments. |
| Low Clamping Ratio | VC/VBR = 13.4/9.1 ≈ 1.47 - tight ratio minimizes overvoltage stress on downstream components relative to breakdown threshold. |
| Thermal Stability | Max TJ = +150°C with 165 °C/W RJA - enables reliable operation in under-hood automotive or enclosed industrial enclosures. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Suppressing load dump transients (up to 60 V, 100 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp overshoot before regulator overvoltage shutdown. Use Value: Limits peak voltage to 13.4 V, preventing damage to 16 V-rated input stages and ensuring uninterrupted microcontroller operation during ISO 16750-2 test pulses. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from induced surges in factory floor wiring. IC Role / Device Role / Timing Role: Parallel-connected TVS across optocoupler input terminals to divert fast transients before optical isolation barrier breakdown. Use Value: Responds in <1 ns to 1 kV/µs edge rates, clamping to 13.4 V while maintaining <50 µA leakage to preserve input logic threshold integrity. |
| Medical Equipment Isolated Interface | Telecom Power Supply Surge Suppression |
|
Use Scenario: Safeguarding patient-connected analog front-end inputs in diagnostic devices compliant with IEC 60601-1 3rd edition. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on secondary-side 5 V or 3.3 V isolated power rails feeding ADCs and sensors. Use Value: Meets creepage/clearance requirements via certified construction and limits fault energy to safe levels during defibrillator discharge testing. |
Use Scenario: Front-end clamping on AC/DC adapter outputs in VoIP phones and base stations exposed to lightning-induced surges on PoE lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on +48 V DC output rail, coordinated with upstream MOV and fuse for staged protection. Use Value: Handles 1500 W single-event surges without degradation, enabling compact design versus multi-stage discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | Lower peak power (600 W), same VRWM (7.78 V), slightly higher VC (13.6 V @ 44 A) | Better suited for space-constrained PCBs where 1500 W rating is not required; SMB package has smaller footprint (4.6 × 3.9 mm) | Select SMBJ9.0A only if system-level surge testing confirms 600 W sufficiency and layout allows reduced thermal mass. |
| 1.5KE9.1A | Through-hole TO-204AA (DO-41) package, identical electrical specs but higher thermal resistance (RJA = 200 °C/W) | Requires manual assembly or wave soldering; less suitable for automated SMT lines or high-density boards | Choose 1.5KE9.1A only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency. |
Compared with SMBJ9.0A and 1.5KE9.1A, the 1.5SMC9.1AT3 delivers superior surge handling in an SMT-optimized package with UL 497B certification - making it the preferred choice for high-reliability automotive, industrial, and medical applications demanding validated loop protection.
Availability
1.5SMC9.1AT3 is available at Aetrix Electronics and suitable for automotive ECU power conditioning, industrial PLC I/O protection, and medical isolated interface circuits requiring stable component supply across extended product lifecycles.
Supply support for 1.5SMC9.1AT3 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, communications, and computing markets.
The 1.5SMC9.1AT3 belongs to ON Semiconductor's SMC-series transient voltage suppressors - engineered specifically for high-energy, surface-mount surge protection in harsh environments where reliability, certification, and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of the 1.5SMC9.1AT3 under maximum surge conditions?
The 1.5SMC9.1AT3 has a maximum clamping voltage (VC) of 13.4 V when subjected to its rated peak pulse current of 112 A (10/1000 µs waveform). This value is guaranteed across temperature and lifetime, ensuring downstream components see no more than 13.4 V during worst-case transients - critical for protecting 16 V-rated regulators or 5 V logic interfaces fed from a 12 V rail.
Is the 1.5SMC9.1AT3 suitable for bidirectional signal line protection?
No, the 1.5SMC9.1AT3 is a unidirectional TVS diode and must be used with correct polarity: cathode to the protected line, anode to ground. For bidirectional protection (e.g., RS-485, USB D+/D−), a dedicated bidirectional part such as 1.5SMC9.0CA is required. Using 1.5SMC9.1AT3 on AC-coupled or floating signals risks forward conduction and failure.
Does the 1.5SMC9.1AT3 meet UL 497B requirements for isolated loop protection?
Yes, the 1.5SMC9.1AT3 carries full UL 497B recognition (File #116110, category QVGV2) for isolated loop circuit protection. It has passed all required tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation - making it suitable for certified 4–20 mA sensor loops and other safety-critical isolated interfaces without additional qualification.
What is the maximum leakage current of the 1.5SMC9.1AT3 at its working voltage?
At its working peak reverse voltage (VRWM) of 7.78 V, the 1.5SMC9.1AT3 guarantees a maximum reverse leakage current (IR) of 50 µA at 25°C. This low leakage ensures minimal power loss and avoids false triggering in high-impedance monitoring circuits - especially important in battery-powered or precision analog systems where quiescent current budgets are tight.
Can the 1.5SMC9.1AT3 be used in automotive under-hood applications?
Yes, the 1.5SMC9.1AT3 is qualified for operation from –65°C to +150°C junction temperature and is widely deployed in automotive under-hood ECUs. Its 1500 W peak power rating supports ISO 7637-2 Pulse 5a load dump suppression, and its SMC package offers robust mechanical reliability under thermal cycling and vibration - confirmed by ON Semiconductor's AEC-Q200 stress testing alignment.
1.5SMC9.1AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 112A
- 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:
- SMC
1.5SMC9.1AT3 FAQ
1.How can I place an order for 1.5SMC9.1AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC9.1AT3 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 1.5SMC9.1AT3 reliable?
The price and inventory of 1.5SMC9.1AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC9.1AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC9.1AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC9.1AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC9.1AT3?
1.5SMC9.1AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC9.1AT3 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 1.5SMC9.1AT3?
For technical support, including 1.5SMC9.1AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC9.1AT3 requirements.
6.How does Aetrix verify that 1.5SMC9.1AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC9.1AT3 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 1.5SMC9.1AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC9.1AT3?
All 1.5SMC9.1AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC9.1AT3, 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 1.5SMC9.1AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC9.1AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC9.1AT3 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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