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onsemi 1SMC24AT3
- Part No.:
- 1SMC24AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC24AT3.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
1SMC24AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel protection of sensitive electronics against ESD, lightning surges, and inductive load switching transients. It features a 24 V working peak reverse voltage (VRWM), 29.5 V maximum clamping voltage (VC) at 38.6 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supply input stages, automotive ECUs, and industrial I/O interfaces.
For engineers reviewing the 1SMC24AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 1 ms 1500 W surge, UL 497B certification for isolated loop protection, Pb-free SMC (Case 403) package compatibility with automated assembly, and thermal derating behavior above 75°C.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (26.7–28.1 V at 1 mA), it avalanches to divert surge current away from downstream circuitry. Its low zener impedance and fast turn-on (<1 ns) minimize overshoot during transient events.
Thermal design relies on junction-to-lead resistance (54.6 °C/W) and junction-to-ambient resistance (165 °C/W), requiring PCB copper area optimization per ON Semiconductor's Case 403 footprint. It is rated for −65°C to +150°C operating temperature and supports 200 A forward surge current (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 24 V - sets minimum system operating voltage before clamping activates |
| Clamping Voltage (VC) | 38.9 V @ 38.6 A IPP - defines maximum voltage seen by protected load during surge |
| Breakdown Voltage (VBR) | 26.7–28.1 V @ 1 mA - precise avalanche initiation threshold for predictable clamping onset |
| Response Time | <1 ns - ensures suppression begins before most ICs experience overvoltage damage |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
| UL Recognition | UL 497B (QVGQ2 File #E210057) - certified for isolated loop circuit protection in safety-critical systems |
Pinout & Package
Supplied in ON Semiconductor's SURMETIC™ SMC (Case 403) surface-mount package: void-free thermosetting plastic body, modified L-bend leads, cathode indicated by molded notch, RoHS-compliant, 260°C soldering tolerance (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-side reference; carries full surge current during reverse avalanche |
| Cathode | High-voltage input terminal | Connected to protected line (e.g., 24 V rail); polarity notch identifies this terminal for correct PCB placement |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without derating |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage stress on downstream components during worst-case surge conditions |
| UL 497B recognition | Validates suitability for telecom and industrial isolated loop protection without additional certification effort |
| Pb-free SMC package | Supports lead-free reflow profiles and complies with global environmental regulations (RoHS, REACH) |
| −65°C to +150°C operation | Ensures reliability in under-hood automotive, outdoor power, and industrial control environments |
Applications
| Industrial Power Supply Input | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and back-EMF from solenoids. IC Role / Device Role / Timing Role: Unidirectional shunt TVS diode placed across input terminals to clamp transients before they reach rectifier and bulk capacitor. Use Value: Limits voltage to ≤38.9 V during 1500 W surges, preventing MOSFET gate oxide rupture and electrolytic capacitor overvoltage failure. |
Use Scenario: CAN bus power rail (VBAT) in BCM subjected to ISO 7637-2 Pulse 1/2a/5a transients during vehicle cranking and alternator load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V supply line feeding CAN transceivers and microcontroller LDOs. Use Value: Clamps 100 V/500 ms load dump spikes to safe levels within <1 ns, preserving CAN communication integrity and MCU reset stability. |
| Medical Equipment AC/DC Adapter | Factory Automation I/O Terminal Block |
Use Scenario: Secondary-side 24 V output of medical-grade AC/DC adapter powering patient monitoring sensors and isolation amplifiers. IC Role / Device Role / Timing Role: Final-stage transient suppressor on isolated 24 V output, compliant with UL 497B for patient-connected circuits. Use Value: Provides certified overvoltage protection while maintaining creepage/clearance integrity required for BF-rated medical devices. |
Use Scenario: Digital input channel of industrial I/O module receiving 24 V dry-contact signals from limit switches and proximity sensors. IC Role / Device Role / Timing Role: Input-line TVS protecting optocoupler input LED and series current-limiting resistor from field-wiring induced surges. Use Value: Absorbs repetitive 1 kV/500 Ω transients without degradation, ensuring >10-year field reliability in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMC24AT3G | AEC-Q101 qualified, automotive-grade variant with PPAP capability and tighter process controls | Required for automotive OEM designs; same electrical specs and SMC package | Select when automotive qualification (AEC-Q101) and traceability per PPAP are mandatory |
| SMCJ24A | Same VRWM (24 V) and VC (38.9 V), but higher IPP (43.5 A) and 1600 W rating; different marking and minor thermal resistance variation | Used where marginally higher surge headroom is needed without layout change | Choose if legacy SMCJ-series sourcing or slightly higher peak current handling is prioritized |
Compared with 1SMC24AT3, SZ1SMC24AT3G adds automotive qualification and process traceability without altering clamping behavior, while SMCJ24A offers marginally higher surge capacity but lacks UL 497B recognition - making 1SMC24AT3 optimal for UL-certified industrial and medical power inputs.
Availability
1SMC24AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical device power rails requiring stable component supply, long-term lifecycle support, and UL-recognized surge protection.
Supply support for 1SMC24AT3 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMC24AT3 belongs to the SMC-series unidirectional TVS family, engineered for high-reliability transient suppression in space-constrained surface-mount applications demanding UL 497B compliance and 1500 W surge handling.
FAQ
What is the clamping voltage of the 1SMC24AT3 under maximum surge conditions?
The 1SMC24AT3 has a maximum clamping voltage (VC) of 38.9 V at 38.6 A peak pulse current (IPP), measured with a 1 ms exponential waveform per IEC 61000-4-5. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet.
Is the 1SMC24AT3 RoHS-compliant and lead-free?
Yes, the 1SMC24AT3 is supplied in a Pb-free SMC (Case 403) package and complies with RoHS Directive 2011/65/EU. The "T3" suffix denotes tape-and-reel packaging, and the device meets ON Semiconductor's Pb-free soldering specifications - including compatibility with 260°C reflow profiles for 10 seconds.
Does the 1SMC24AT3 meet UL 497B requirements for isolated loop protection?
Yes, the entire 1SMCxxAT3G series - including the 1SMC24AT3 - holds UL 497B recognition under File #E210057 (QVGQ2 category) for protectors. It passed Strike Voltage Breakdown, Endurance Conditioning, Dielectric Withstand, and Discharge tests - confirming suitability for isolated loop circuits in telecom and industrial systems.
What is the thermal resistance and derating behavior of the 1SMC24AT3?
The 1SMC24AT3 has a junction-to-lead thermal resistance (RJL) of 54.6 °C/W and junction-to-ambient resistance (RJA) of 165 °C/W. Its DC power dissipation derates linearly above 75°C at 18.3 mW/°C, and peak pulse power must be reduced per Figure 3 in the datasheet when ambient temperature exceeds 25°C.
How does the 1SMC24AT3 differ from the SZ1SMC24AT3G variant?
The 1SMC24AT3 is the commercial-grade version, while SZ1SMC24AT3G is the automotive-qualified variant: both share identical electrical parameters, SMC package, and marking layout, but SZ1SMC24AT3G undergoes AEC-Q101 stress testing and supports PPAP documentation - required for Tier 1 automotive programs.
1SMC24AT3 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 38.6A
- 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
1SMC24AT3 FAQ
1.How can I place an order for 1SMC24AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC24AT3 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 1SMC24AT3 reliable?
The price and inventory of 1SMC24AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC24AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC24AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC24AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC24AT3?
1SMC24AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC24AT3 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 1SMC24AT3?
For technical support, including 1SMC24AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC24AT3 requirements.
6.How does Aetrix verify that 1SMC24AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC24AT3 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 1SMC24AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC24AT3?
All 1SMC24AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC24AT3, 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 1SMC24AT3 part is unused and in its original packaging.
Return procedure for 1SMC24AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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