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onsemi 1.5SMC24AT3
- Part No.:
- 1.5SMC24AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC24AT3.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,138
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Product details
Overview
1.5SMC24AT3 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 24 V nominal Zener breakdown voltage (VBR), 33.2 V maximum clamping voltage (VC) at 45 A peak pulse current (IPP), and <1.0 ns response time - enabling robust ESD and surge immunity in automotive power supplies, industrial I/O interfaces, and telecom front-ends.
For engineers reviewing the 1.5SMC24AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (20.5 V), clamping performance under 1 ms 1500 W transients, UL 497B recognition for isolated loop protection, and Pb-free SMC (Case 403) surface-mount compatibility with standard reflow profiles.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt device: when reverse voltage exceeds its 20.5 V working peak reverse voltage (VRWM), it avalanches to limit transient energy by diverting surge current to ground. Its low dynamic impedance (<0.094 Ω derived from ΔV/ΔI across VBR–VC) ensures stable clamping during fast-rising transients up to 45 A.
The device uses a planar junction structure in an epoxy-molded SURMETIC® package (Case 403), rated for 1500 W non-repetitive peak power per 10/1000 µs waveform, with thermal resistance RJL = 18.3 °C/W and operating junction temperature range of −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 20.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for reliable standby operation. |
| VBR @ IT = 1 A | 22–25.2 V - Verified Zener breakdown range at 1 A test current; defines precise turn-on threshold for design validation. |
| VC @ IPP = 45 A | 33.2 V - Maximum clamped voltage during 1500 W transient; determines protected circuit's worst-case overvoltage stress. |
| IPP | 45 A - Peak pulse current capability at 1 ms pulse width; quantifies surge handling capacity for IEC 61000-4-5 Level 4 compliance. |
| Leakage @ VRWM | <5 µA - Ultra-low reverse leakage at rated working voltage; avoids unnecessary power loss in battery-backed or low-quiescent systems. |
| Response Time | <1.0 ns - Sub-nanosecond avalanche initiation enables protection against ESD events (IEC 61000-4-2) and fast transients without overshoot. |
| UL Recognition | UL 497B certified - Validated for isolated loop circuit protection including strike voltage, endurance, and dielectric withstand tests. |
Pinout & Package
1.5SMC24AT3 is housed in the SMC (Case 403) surface-mount package: 5.84 mm × 6.86 mm × 2.13 mm body with modified L-bend leads, cathode indicated by molded notch, and Pb-free matte tin plating. Designed for reflow soldering at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for unidirectional clamping | Connected to system ground or low-side return path; establishes polarity-dependent conduction direction. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); avalanche occurs when cathode-to-anode voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Supports IEC 61000-4-5 4th-level surge immunity (2 Ω source impedance, 1.2/50 µs + 8/20 µs combo wave) without derating. |
| ESD rating >16 kV HBM | Meets or exceeds IEC 61000-4-2 Level 4 (±8 kV contact / ±15 kV air) without external series impedance. |
| AEC-Q101 qualified (SZ variant) | Validated for automotive under-hood applications including engine control modules and body electronics. |
| Low clamping ratio (VC/VBR ≈ 1.43) | Minimizes overvoltage margin required between protected IC's absolute maximum rating and VC. |
| SURMETIC® package reliability | Void-free thermoset molding ensures mechanical robustness and moisture resistance per J-STD-020 MSL 1 rating. |
Applications
| Industrial PLC Analog Input | Automotive 24 V Power Distribution |
|---|---|
Use Scenario: Protecting 0–10 V or 4–20 mA analog input channels from induced surges on factory floor wiring. IC Role / Device Role: Shunt clamping element placed directly across input terminals upstream of signal conditioning op-amps. Use Value: Limits transient voltage to ≤33.2 V, preserving ADC input stage integrity while maintaining sub-5 µA leakage for high-impedance sensor interfacing. |
Use Scenario: Safeguarding electronic control units (ECUs) connected to 24 V vehicle battery bus against load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary overvoltage clamp on main power rail, coordinated with upstream fuse and downstream DC-DC converter. Use Value: Withstands 1500 W surges per ISO 7637-2 Pulse 5a (load dump), clamping peak to 33.2 V to prevent MOSFET gate oxide failure in power switches. |
| Telecom Line Interface Card | Medical Equipment Power Entry |
Use Scenario: Front-end protection for Ethernet PHYs or RS-485 transceivers exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role: First-stage TVS on differential pair or common-mode line, paired with GDT or MOV for staged protection. Use Value: Fast <1 ns response captures initial edge of 10/700 µs telecom surge, limiting let-through voltage before secondary protection activates. |
Use Scenario: Secondary overvoltage suppression on AC/DC adapter output rails feeding sensitive diagnostic imaging subsystems. IC Role / Device Role: Final-stage transient limiter before LDO regulators powering FPGA or ADC reference circuits. Use Value: UL 497B certification validates suitability for patient-connected equipment isolation barriers; 33.2 V clamping prevents latch-up in 3.3 V logic domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower peak power (600 W), same VRWM (20.5 V), identical SMC-compatible SMB package footprint. | Not suitable for IEC 61000-4-5 Level 4 or ISO 7637-2 Pulse 5a; limited to lower-energy transients in consumer-grade power supplies. | Select when board space constraints require smaller SMB package and surge requirements are ≤600 W. |
| 1.5KE24A | Higher leakage (>50 µA), axial-leaded DO-201 package, slower response (~1.5 ns), no UL 497B listing. | Lacks surface-mount compatibility and regulatory approval for medical/industrial isolated loops; requires through-hole assembly. | Choose only for legacy through-hole designs where rework to SMD is impractical and UL certification is not mandated. |
Compared with SMBJ24A and 1.5KE24A, the 1.5SMC24AT3 delivers higher surge robustness (1500 W vs. 600 W or unspecified), certified isolation-loop compliance (UL 497B), and superior leakage performance (<5 µA), making it the preferred choice for new industrial, automotive, and medical designs requiring validated high-energy transient immunity.
Availability
1.5SMC24AT3 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive 24 V power distribution, and telecom line interface cards requiring stable component supply, long-term lifecycle support, and traceable Pb-free sourcing.
Supply support for 1.5SMC24AT3 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, high-performance silicon solutions for automotive, industrial, cloud computing, and IoT applications.
The 1.5SMC24AT3 belongs to ON Semiconductor's SMC-series TVS portfolio, engineered specifically for high-power, surface-mount transient suppression in harsh environments - emphasizing low clamping ratio, fast response, and regulatory compliance for mission-critical infrastructure.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5SMC24AT3?
The 1.5SMC24AT3 has a working peak reverse voltage (VRWM) of 20.5 V. This value defines the maximum continuous DC or peak AC voltage the device can block in normal operation without entering avalanche conduction. Engineers must ensure system operating voltage remains at or below this threshold to avoid premature clamping or increased leakage in the 1.5SMC24AT3.
Does the 1.5SMC24AT3 meet automotive qualification standards?
The base 1.5SMC24AT3 is not AEC-Q101 qualified; however, its SZ-prefix variant (SZ1.5SMC24AT3G) is fully AEC-Q101 qualified and PPAP capable. The 1.5SMC24AT3 shares identical electrical specs and package dimensions but lacks the automotive-specific process controls and documentation required for under-hood deployment. For automotive use, specify the SZ version.
What is the maximum clamping voltage (VC) of the 1.5SMC24AT3 at its rated peak pulse current?
The 1.5SMC24AT3 exhibits a maximum clamping voltage (VC) of 33.2 V when subjected to its rated peak pulse current of 45 A (10/1000 µs waveform). This value represents the worst-case voltage imposed on the protected circuit during a full 1500 W transient event and is critical for verifying that downstream components remain within their absolute maximum voltage ratings.
Is the 1.5SMC24AT3 RoHS-compliant and lead-free?
Yes, the 1.5SMC24AT3 is a Pb-free device manufactured in ON Semiconductor's SURMETIC® package with matte tin lead finish. It complies with RoHS Directive 2011/65/EU and is compatible with standard lead-free reflow soldering profiles (peak temperature 260 °C for 10 seconds). The "T3" suffix denotes packaging on a 13-inch tape-and-reel (2500 units per reel).
How does the 1.5SMC24AT3 differ from bidirectional TVS diodes?
The 1.5SMC24AT3 is unidirectional and functions only during reverse-biased transients - it conducts when cathode voltage exceeds anode voltage by >20.5 V. Unlike bidirectional variants, it does not suppress positive-going transients on grounded lines or AC signals. Its asymmetry makes it ideal for DC rail protection where polarity is fixed, offering lower capacitance and tighter VBR tolerance than bidirectional equivalents.
1.5SMC24AT3 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 45A
- 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
1.5SMC24AT3 FAQ
1.How can I place an order for 1.5SMC24AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC24AT3 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 1.5SMC24AT3 reliable?
The price and inventory of 1.5SMC24AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC24AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC24AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC24AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC24AT3?
1.5SMC24AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC24AT3 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 1.5SMC24AT3?
For technical support, including 1.5SMC24AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC24AT3 requirements.
6.How does Aetrix verify that 1.5SMC24AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC24AT3 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 1.5SMC24AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC24AT3?
All 1.5SMC24AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC24AT3, 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 1.5SMC24AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC24AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC24AT3 Tags
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ESD9B5.0ST5G
onsemi
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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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Diodes Incorporated
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