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onsemi 1.5SMC91AT3
- Part No.:
- 1.5SMC91AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC91AT3.pdf
- Description:
- TVS DIODE 77.8VWM 125VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,577
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Product details
Overview
1.5SMC91AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 77.8 V working peak reverse voltage (VRWM), 91 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps to 125 V at 12 A peak pulse current (IPP), making it suitable for automotive power supply surge suppression and industrial I/O port protection.
For engineers reviewing the 1.5SMC91AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 1 ms transients, UL 497B recognition for isolated loop circuits, and SMC package thermal performance in high-density PCB layouts.
Technical Context
This device operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR of 91 V (min 86.5 V, max 95.5 V). Its low dynamic impedance and sub-1 ns response time enable fast clamping of ESD and lightning-induced surges without significant overshoot-critical for protecting downstream MOSFET gate drivers and microcontroller I/Os.
The 1.5SMC91AT3 uses a thermoset plastic Surmetic™ SMC package with modified L-bend leads for enhanced solder joint reliability. Thermal resistance from junction to lead is 18.3 °C/W, supporting sustained power dissipation up to 4.0 W at 75°C lead temperature, with derating above that point per published curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms 10/1000 µs waveform - withstands automotive load dump and ISO 7637-2 Pulse 5a transients |
| Working Peak Reverse Voltage (VRWM) | 77.8 V - sets maximum continuous DC operating voltage before leakage exceeds 5 µA |
| Zener Breakdown Voltage (VBR) | 86.5–95.5 V @ 1 mA - defines precise conduction onset for accurate overvoltage thresholding |
| Clamping Voltage (VC) | 125 V @ 12 A IPP - limits protected circuit voltage during surge, providing ≥30% margin over 91 V rail |
| Leakage Current (IR) | <5 µA @ 77.8 V - ensures minimal standby power loss in always-on systems like telematics modules |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for robust board-level ESD immunity |
| UL Recognition | UL 497B (QVGV2) - certified for use in isolated telecom/data line protectors and safety-critical interfaces |
Pinout & Package
1.5SMC91AT3 is housed in an SMC (DO-214AB) surface-mount package (Case 403), featuring a molded cathode notch for polarity identification and modified L-bend leads optimized for high-reliability soldering on FR-4 PCBs. The package measures 7.75 × 6.10 × 2.41 mm (L × W × H) with 2.92 mm lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-side reference; must be routed with minimal inductance to avoid voltage overshoot |
| Cathode | High-side connection to protected line | Marked by molded notch; ties to rail being protected (e.g., 72 V battery input); determines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| Surmetic™ SMC package | Void-free thermoset molding enables >260°C soldering tolerance and long-term moisture resistance in harsh environments |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes stress on downstream components by tightly constraining transient voltage excursion |
| Temperature coefficient of VBR | +0.106 %/°C - enables predictable voltage shift across –65°C to +150°C operating range for thermal-aware design |
| Fast response time | <1 ns - initiates clamping before most IC damage mechanisms (e.g., gate oxide rupture) can occur |
| UL 497B recognition | Validated for isolated loop protection including strike voltage breakdown and endurance conditioning tests |
Applications
| Automotive Power Supply Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 72 V battery-fed ECUs against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Clamps 125 V at 12 A, limiting stress on upstream fuse and downstream regulator while maintaining UL 497B compliance. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each optocoupler input node to shunt induced transients before signal conditioning. Use Value: Sub-1 ns response prevents false triggering of input latches; 5 µA leakage avoids erroneous logic states in high-impedance sensing. |
| Medical Equipment Power Rails | Telecom Isolated Data Line Protection |
|
Use Scenario: Securing auxiliary 48 V power distribution in diagnostic imaging systems where failure could interrupt critical scans. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side SMPS output feeding FPGA power domains. Use Value: 1500 W peak power rating handles rare but catastrophic coupling events from nearby MRI gradient switching, with no degradation after single-event exposure. |
Use Scenario: Protecting RS-485 transceivers connected to outdoor cabling in security or building automation networks. IC Role / Device Role / Timing Role: UL 497B-certified TVS on isolated side of signal transformer to meet telecom surge immunity standards. Use Value: Recognized under UL 497B QVGV2 category confirms suitability for isolated loop applications-beyond basic component-level ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ91A | Lower peak power (600 W), same VRWM (77.8 V), identical SMC footprint but lower IPP (12 A → 6.5 A) | Suitable only for lighter-duty transients (e.g., IEC 61000-4-5 Level 3), not ISO 7637-2 Pulse 5a | Select when cost sensitivity outweighs surge margin and layout space allows multiple devices in parallel |
| 1.5KE91A | Through-hole DO-201 package, same electrical specs, higher thermal mass but incompatible with SMT assembly | Used in legacy designs or high-reliability aerospace where manual rework and thermal cycling stability are prioritized | Choose only if through-hole manufacturing is mandatory and board real estate permits larger footprint |
Compared with SMBJ91A and 1.5KE91A, the 1.5SMC91AT3 delivers full 1500 W surge handling in an SMT-compatible SMC package with UL 497B certification-enabling compact, automotive-grade, and safety-compliant designs without layout or process compromise.
Availability
1.5SMC91AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, medical power supplies, and telecom infrastructure requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC91AT3 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 manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5SMC91AT3 belongs to the SMC-series transient voltage suppressors-a family engineered for high-energy surge clamping in space-constrained surface-mount applications, with emphasis on automotive qualification and safety-standard compliance.
FAQ
What is the maximum clamping voltage of the 1.5SMC91AT3 under standard test conditions?
The 1.5SMC91AT3 has a maximum clamping voltage (VC) of 125 V when subjected to its rated peak pulse current of 12 A using a 10/1000 µs waveform. This value is measured at TA = 25°C and reflects worst-case voltage seen by protected circuitry during surge events-critical for ensuring downstream components remain within absolute maximum ratings. The 1.5SMC91AT3 achieves this while maintaining tight VBR tolerance (86.5–95.5 V) and low dynamic impedance.
Does the 1.5SMC91AT3 meet any safety certifications for isolation applications?
Yes, the 1.5SMC91AT3 carries UL 497B recognition (File #116110, Category QVGV2) specifically for isolated loop circuit protection. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing-going beyond basic flammability ratings. It confirms suitability for telecom/data line isolators and other safety-critical interfaces where regulatory approval is mandatory, unlike generic TVS diodes lacking such recognition.
What is the thermal resistance and power derating behavior of the 1.5SMC91AT3?
The 1.5SMC91AT3 has a thermal resistance from junction to lead (RJL) of 18.3 °C/W and dissipates up to 4.0 W continuously at TL = 75°C. Above 75°C, power must be linearly derated at 18.3 mW/°C. For ambient operation, its RJA is 165 °C/W, allowing 0.75 W at TA = 25°C with derating at 6.1 mW/°C above that. These values are verified using ON Semiconductor's recommended minimum footprint on FR-4 board and inform heatsinking decisions in high-power surge scenarios.
How does the 1.5SMC91AT3 perform under repeated surge stress?
The 1.5SMC91AT3 is rated for non-repetitive 1 ms pulses per JEDEC standards, and its datasheet specifies performance under single-event conditions-not repetitive duty cycles. While it survives one 1500 W surge, repeated exposure requires derating per Figure 3: at 100°C ambient, peak power drops to ~40% of rated value. For cyclic surge environments (e.g., motor drive feedback lines), system-level testing is required to validate lifetime; the 1.5SMC91AT3 itself does not specify repetitive surge endurance.
Is the 1.5SMC91AT3 compatible with lead-free reflow soldering processes?
Yes, the 1.5SMC91AT3 supports lead-free reflow with a maximum soldering temperature of 260°C for 10 seconds, matching IPC/JEDEC J-STD-020 requirements. Its Surmetic™ thermoset plastic package and modified L-bend leads ensure mechanical integrity and wetting reliability under standard Pb-free profiles. The device is RoHS-compliant and qualified for use in automotive and industrial assemblies requiring lead-free manufacturing, with no special pre-conditioning needed prior to reflow.
1.5SMC91AT3 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):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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
1.5SMC91AT3 FAQ
1.How can I place an order for 1.5SMC91AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC91AT3 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 1.5SMC91AT3 reliable?
The price and inventory of 1.5SMC91AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC91AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC91AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC91AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC91AT3?
1.5SMC91AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC91AT3 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 1.5SMC91AT3?
For technical support, including 1.5SMC91AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC91AT3 requirements.
6.How does Aetrix verify that 1.5SMC91AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC91AT3 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 1.5SMC91AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC91AT3?
All 1.5SMC91AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC91AT3, 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 1.5SMC91AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC91AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC91AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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