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onsemi 1SMC36AT3
- Part No.:
- 1SMC36AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC36AT3.pdf
- Description:
- TVS DIODE 36VWM 58.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,507
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Product details
Overview
1SMC36AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of DC power rails and signal lines. It features a 36 V working peak reverse voltage (VRWM), 44.2 V minimum breakdown voltage (VBR) at 1 A, 58.1 V maximum clamping voltage (VC) at 25.8 A peak pulse current, and sub-1 ns response time-used in automotive power supply input stages to limit load-dump-induced transients.
For engineers reviewing the 1SMC36AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under ISO 7637-2 Pulse 5a/b, UL 497B recognition for isolated loop circuits, and SMC package thermal performance on FR-4 PCBs.
Technical Context
The 1SMC36AT3 operates as a Zener-based unidirectional TVS diode with avalanche breakdown behavior above VRWM. Its junction structure enables low dynamic impedance (<0.5 Ω typical) during transient conduction and maintains <5 µA leakage at 36 V DC.
It is rated for 1500 W non-repetitive peak power (10/1000 µs waveform), supports 200 A forward surge current (8.3 ms half-sine), and exhibits a temperature coefficient of ±0.05 %/°C for VBR-enabling stable clamping across −65 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36 V - Maximum continuous reverse voltage before clamping begins; must exceed system nominal DC bus voltage (e.g., 24 V automotive). |
| VBR @ IT=1 A | 44.2 V min - Breakdown initiates no earlier than this voltage; ensures reliable turn-on after VRWM margin. |
| VC @ IPP=25.8 A | 58.1 V max - Clamped voltage seen by protected circuit during worst-case 10/1000 µs surge; defines overvoltage stress ceiling. |
| PPK | 1500 W @ 1 ms - Peak energy absorption capability; validates compliance with IEC 61000-4-5 Level 4 (4 kV) when combined with series impedance. |
| Response Time | <1 ns - Enables suppression of fast-rising ESD and switching transients before downstream ICs experience overstress. |
| Leakage @ VRWM | <5 µA - Negligible standby power loss; critical for always-on automotive modules and battery-backed systems. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; permits use in telecom/data line interfaces without additional certification effort. |
Pinout & Package
1SMC36AT3 is housed in an SMC (DO-214AB) surface-mount plastic package (Case 403), featuring a modified L-bend leadform optimized for solder joint reliability and thermal transfer to copper pads. Cathode is marked by a molded polarity notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; establishes clamping reference point for unidirectional operation. |
| Cathode | High-side transient sink | Connected to protected line (e.g., 24 V rail); conducts surge current to ground when voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Validated for ISO 7637-2 Pulse 5a (load dump) in 12 V/24 V automotive systems with appropriate series impedance. |
| Clamping ratio VC/VBR = 1.31 | Indicates tight Zener control and low dynamic impedance-reduces overshoot and improves protection margin vs. higher-ratio devices. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 without external ESD diodes-simplifies front-end protection for CAN/LIN transceivers. |
| Pb-free Surmetic package | RoHS-compliant thermoset molding compound with 260 °C reflow tolerance and corrosion-resistant leads for high-reliability assembly. |
| −65 °C to +150 °C operation | Supports under-hood automotive placement and industrial environments where ambient extremes exceed standard commercial grade limits. |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 24 V vehicle battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and DC/DC converter input. Use Value: Limits transient voltage to ≤58.1 V, preventing damage to 40 V-rated input MOSFETs and enabling single-stage protection without series resistors. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against field-wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each optocoupler input leg to clamp induced lightning surges per IEC 61000-4-5. Use Value: UL 497B recognition allows direct integration into certified isolated loop designs without requalification of the entire interface. |
| Medical Equipment AC/DC Adapter Input | Telecom Line Interface Protection |
Use Scenario: Safeguarding primary-side rectifier and controller ICs in Class II medical power supplies subjected to EN 61000-4-4 EFT bursts. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input to absorb repetitive fast transients before they propagate to switching stage. Use Value: Sub-1 ns response ensures clamping activation prior to 5 ns rise-time EFT events, reducing stress on Y-capacitors and bridge rectifiers. |
Use Scenario: Protecting RS-485 transceivers connected to long outdoor data cables exposed to induced lightning currents. IC Role / Device Role / Timing Role: Placed differential-mode across A/B lines and common-mode from A/B to GND in conjunction with gas discharge tubes. Use Value: 1500 W rating enables coordination with upstream GDTs to handle 10/1000 µs surges up to 10 kV without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Same VRWM (36 V) and VC (58.1 V), but lower PPK = 600 W; SMB package has higher RJA (165 °C/W vs. 54.6 °C/W). | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load dump without derating. | Select 1SMC36AT3 when 1500 W surge capacity and superior thermal dissipation are required for high-reliability 24 V systems. |
| 1.5SMC36A | Identical electrical specs and SMC package, but obsolete ON Semiconductor part number; superseded by 1SMC36AT3G (Pb-free variant). | No functional difference; same footprint, ratings, and qualification-only packaging and marking differ. | 1SMC36AT3 is the current production version; 1.5SMC36A is not recommended for new designs due to obsolescence status. |
Compared with SMBJ36A, the 1SMC36AT3 delivers 2.5× higher surge power and 3× better thermal resistance-critical for sustained transient immunity in automotive and industrial power inputs. Against 1.5SMC36A, it offers identical performance with updated Pb-free compliance and active manufacturing support.
Availability
1SMC36AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, medical power supplies, and telecom line interfaces requiring stable component supply and full regulatory recognition including UL 497B.
Supply support for 1SMC36AT3 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMC36AT3 belongs to the SMC-series Zener TVS family, engineered specifically for high-energy transient suppression in harsh environments-emphasizing robustness, UL certification, and thermal reliability over cost-optimized consumer-grade alternatives.
FAQ
What is the clamping voltage of the 1SMC36AT3 at its rated peak pulse current?
The 1SMC36AT3 has a maximum clamping voltage (VC) of 58.1 V at 25.8 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Electrical Characteristics table on page 3 of the official ON Semiconductor datasheet.
Is the 1SMC36AT3 suitable for bidirectional transient protection?
No, the 1SMC36AT3 is a unidirectional TVS diode and is not rated for bidirectional operation. The datasheet explicitly states "Bidirectional devices will not be available in this series," and its electrical specifications-including VRWM, VBR, and polarity marking-are defined only for reverse-biased conduction. For AC or dual-polarity protection, a dedicated bidirectional device such as SMBJ36CA must be selected.
Does the 1SMC36AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire 1SMC5.0AT3 series-including the 1SMC36AT3-is UL Recognized under file #E210057 for protectors per UL 497B. This certification covers testing for strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-making it suitable for use in certified isolated data and control loops without additional system-level validation.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMC36AT3?
The 1SMC36AT3 has a thermal resistance from junction-to-lead (RJL) of 54.6 °C/W, measured under conditions of 1 in² copper pad on FR-4 board. This parameter directly impacts power derating at elevated temperatures and supports thermal design for high-duty-cycle surge environments where lead temperature must remain below 150 °C.
Can the 1SMC36AT3 be used in place of the older 1.5SMC36A part?
Yes, the 1SMC36AT3 is the direct replacement for 1.5SMC36A, sharing identical electrical specifications, SMC package dimensions, and thermal performance. The "T3" suffix denotes the same tape-and-reel packaging format, and the "G" suffix indicates Pb-free compliance-making 1SMC36AT3 the current production version with full backward compatibility and extended lifecycle support.
1SMC36AT3 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):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 25.8A
- 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
1SMC36AT3 FAQ
1.How can I place an order for 1SMC36AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC36AT3 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 1SMC36AT3 reliable?
The price and inventory of 1SMC36AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC36AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC36AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC36AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC36AT3?
1SMC36AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC36AT3 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 1SMC36AT3?
For technical support, including 1SMC36AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC36AT3 requirements.
6.How does Aetrix verify that 1SMC36AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC36AT3 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 1SMC36AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC36AT3?
All 1SMC36AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC36AT3, 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 1SMC36AT3 part is unused and in its original packaging.
Return procedure for 1SMC36AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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