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onsemi 1.5SMC12AT3
- Part No.:
- 1.5SMC12AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC12AT3.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,062
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Product details
Overview
1.5SMC12AT3 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 10.2 V working peak reverse voltage (VRWM), 12 V breakdown voltage (VBR) at 1 mA test current, 16.7 V clamping voltage (VC) at 90 A peak pulse current, and sub-1 ns response time. It is used in automotive power supply inputs, industrial PLC I/O modules, and AC/DC adapter secondary-side surge protection.
For engineers reviewing the 1.5SMC12AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current handling under ISO 7637-2 Pulse 1/2b, UL 497B loop protection compliance, and SMC package thermal performance on FR-4 PCBs.
Technical Context
The 1.5SMC12AT3 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its 12 V nominal breakdown threshold. Its low dynamic impedance (<0.5 Ω typical) ensures stable clamping during 10/1000 µs transients up to 1500 W, with leakage <5 µA at 10.2 V VRWM.
It is rated for –65 °C to +150 °C operating temperature, supports 200 A non-repetitive forward surge (8.3 ms half-sine), and achieves UL 497B recognition for isolated loop circuit protection - a requirement for telecom and industrial interface ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms, sufficient to absorb ISO 7637-2 Pulse 5a (load dump) surges in 12 V automotive systems |
| Working Peak Reverse Voltage (VRWM) | 10.2 V, sets maximum continuous DC bias before leakage exceeds 5 µA - must exceed system nominal voltage |
| Breakdown Voltage (VBR) | 11.4–12.6 V @ 1 mA, defines precise turn-on threshold for controlled clamping onset |
| Clamping Voltage (VC) | 16.7 V @ 90 A IPP, determines maximum voltage seen by downstream ICs during worst-case surge |
| Response Time | <1 ns, enables suppression before fast-edge ESD or lightning-induced transients propagate into sensitive circuitry |
| ESD Rating | Class 3 (>16 kV HBM), qualifies for direct I/O port protection without external series resistance |
| Thermal Resistance (RJA) | 165 °C/W, requires minimum ON Semiconductor-recommended SMC footprint (Case 403) for reliable 0.75 W ambient dissipation |
Pinout & Package
1.5SMC12AT3 uses the SMC (DO-214AB) surface-mount package (Case 403), measuring 7.75 × 6.60 × 2.41 mm, with modified L-bend leads for enhanced pad adhesion and cathode polarity indicated by a molded notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during reverse-bias clamping | Connected to ground or low-impedance return path; forms clamp loop with protected line |
| Cathode | High-voltage input terminal | Connected to protected line (e.g., 12 V rail); polarity notch identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop protection - meets dielectric withstand, endurance, and strike voltage tests required for telecom/data line interfaces |
| Low Clamping Ratio (VC/VBR) | 1.47 (16.7 V / 11.4 V min), minimizing overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| High Surge Current Rating | 90 A peak pulse current (IPP), enabling single-device protection against IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) surges |
| Temperature-Stable Breakdown | 0.078 %/°C tempco, ensuring predictable VBR shift across –40 °C to +125 °C automotive operating range |
| Corrosion-Resistant Finish | Lead finish compatible with Pb-free reflow (260 °C/10 s), supporting RoHS-compliant manufacturing without solderability degradation |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
|---|---|
|
Use Scenario: 12 V battery feed to BCM microcontroller and CAN transceivers exposed to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role: Unidirectional TVS clamp placed between fused 12 V rail and local bulk capacitor. Use Value: Limits transient voltage to ≤16.7 V, preventing latch-up or gate oxide damage in 16 V-rated power management ICs. |
Use Scenario: 4–20 mA current loop input stage subjected to field wiring ESD and inductive kickback. IC Role / Device Role: Primary overvoltage clamp on loop supply line, upstream of precision op-amp and ADC front-end. Use Value: Maintains signal integrity by clamping surges before they saturate input amplifiers or corrupt 16-bit ADC readings. |
| AC/DC Adapter Secondary-Side Output | Telecom Line Interface (TIP/RING) |
|
Use Scenario: 12 V output of flyback converter connected to external USB hub, vulnerable to user-insertion transients. IC Role / Device Role: Final-stage surge suppressor on regulated output, after primary OVP and before connector. Use Value: Absorbs >1500 W energy without failure, eliminating need for redundant TVS or varistor stages in cost-sensitive adapters. |
Use Scenario: TIP/RING pair in VoIP gateway exposed to lightning-induced surges per ITU-T K.20/21. IC Role / Device Role: UL 497B-recognized protector in isolated loop, paired with series current-limiting resistor. Use Value: Meets telecom safety certification requirements while delivering 16.7 V clamping - lower than legacy 22 V alternatives - preserving SLIC headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same VRWM (10.2 V) and VBR (11.4–12.6 V), but lower 600 W peak power and SMB package (smaller thermal mass) | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load dump | Select 1.5SMC12AT3 when surge energy exceeds 600 W or board layout allows SMC footprint |
| 1.5KE12A | Through-hole DO-201 package, identical electrical specs, but no UL 497B recognition and higher lead inductance | Not certified for telecom loop protection; less effective for fast ESD due to parasitic inductance | Choose 1.5SMC12AT3 for surface-mount production, UL compliance, or sub-1 ns response-critical designs |
Compared with SMBJ12A and 1.5KE12A, the 1.5SMC12AT3 delivers superior surge robustness (1500 W vs. 600 W/1500 W), mandatory UL 497B listing for data-line safety, and optimized SMC thermal performance - making it the preferred choice for high-reliability automotive and industrial power rail protection.
Availability
1.5SMC12AT3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power interface designs requiring stable component supply, long-term lifecycle support, and UL-certified surge protection.
Supply support for 1.5SMC12AT3 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 part of onsemi) is a global semiconductor supplier specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud power applications.
The 1.5SMC12AT3 belongs to the SMC-series transient voltage suppressors - engineered for high-energy surge immunity in space-constrained surface-mount layouts while meeting stringent safety standards like UL 497B.
FAQ
What is the clamping voltage of the 1.5SMC12AT3 at its rated peak pulse current?
The 1.5SMC12AT3 has a maximum clamping voltage (VC) of 16.7 V at 90 A peak pulse current (IPP), measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during worst-case surge events and is critical for ensuring compatibility with downstream IC absolute maximum ratings. The 1.5SMC12AT3 maintains this clamping performance across its full operating temperature range.
Is the 1.5SMC12AT3 suitable for protecting 12 V automotive systems against load dump?
Yes, the 1.5SMC12AT3 is specifically rated for 1500 W peak pulse power and 90 A IPP, making it suitable for ISO 7637-2 Pulse 5a load dump protection in 12 V automotive systems. Its 10.2 V VRWM exceeds nominal 12 V rail voltage while allowing margin for regulation tolerance, and its 16.7 V VC ensures protected components remain below their 18–20 V survival thresholds. The 1.5SMC12AT3's UL 497B recognition further validates its reliability in harsh environments.
Does the 1.5SMC12AT3 have UL recognition, and for what standard?
Yes, the 1.5SMC12AT3 carries UL recognition under standard UL 497B for isolated loop circuit protection (File #116110, QVGV2 category). This certification confirms successful completion of strike voltage breakdown, endurance conditioning, temperature, dielectric withstand, and discharge testing - distinguishing it from competitors with only flammability-rated packages. The 1.5SMC12AT3's UL 497B listing is essential for telecom, industrial I/O, and medical equipment requiring certified surge protection.
What is the thermal resistance and power derating behavior of the 1.5SMC12AT3?
The 1.5SMC12AT3 has a junction-to-ambient thermal resistance (RJA) of 165 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended SMC footprint. Its DC power dissipation is 0.75 W at 25 °C ambient, derating linearly to zero at 150 °C. For reliable operation, designers must ensure copper area and airflow meet the Case 403 thermal guidelines - the 1.5SMC12AT3's thermal performance directly impacts long-term surge endurance and leakage stability.
How does the 1.5SMC12AT3 compare to bidirectional TVS diodes in surge protection applications?
The 1.5SMC12AT3 is unidirectional and optimized for DC power rail protection where reverse voltage is blocked by system design (e.g., anode grounded). Unlike bidirectional variants, it provides tighter VBR control and lower clamping voltage for positive transients - critical for 12 V systems. Bidirectional devices like 1.5SMC12AT3G would be inappropriate here, as they conduct on both polarities and exhibit higher VC. The 1.5SMC12AT3's unidirectional architecture ensures no leakage or conduction during normal negative excursions, preserving system efficiency and noise floor.
1.5SMC12AT3 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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 90A
- 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
1.5SMC12AT3 FAQ
1.How can I place an order for 1.5SMC12AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC12AT3 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 1.5SMC12AT3 reliable?
The price and inventory of 1.5SMC12AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC12AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC12AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC12AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC12AT3?
1.5SMC12AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC12AT3 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 1.5SMC12AT3?
For technical support, including 1.5SMC12AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC12AT3 requirements.
6.How does Aetrix verify that 1.5SMC12AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC12AT3 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 1.5SMC12AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC12AT3?
All 1.5SMC12AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC12AT3, 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 1.5SMC12AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC12AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC12AT3 Tags
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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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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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