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onsemi 1.5SMC27AT3
- Part No.:
- 1.5SMC27AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC27AT3.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,313
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Product details
Overview
1.5SMC27AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 23.1 V minimum breakdown voltage at 1 mA, 27 V nominal Zener voltage, 37.5 V maximum clamping voltage at 40 A peak pulse current, and <1.0 ns response time. It is used in automotive power line surge protection and industrial power supply input stages.
For engineers reviewing the 1.5SMC27AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (23.1 V), clamping performance under 40 A transient, UL 497B isolation loop certification, and SMC surface-mount package compatibility with high-energy surge environments.
Technical Context
The 1.5SMC27AT3 operates as a unidirectional Zener-based TVS diode, conducting only in reverse breakdown to clamp transients above its VRWM of 23.1 V. Its low dynamic impedance and fast turn-on (<1.0 ns) enable effective suppression of ESD and lightning-induced surges per IEC 61000-4-2/4-5.
It is rated for 1500 W peak pulse power (10/1000 µs waveform), supports 200 A non-repetitive forward surge current, and exhibits <5 µA leakage at 23.1 V. Thermal resistance is 165 °C/W junction-to-ambient on FR-4 board with minimum footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 10/1000 µs waveform - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage (VRWM) | 23.1 V - sets minimum operating voltage threshold before clamping activates |
| Breakdown Voltage (VBR) | 27 V nominal @ 1 mA test current - defines precise Zener conduction onset |
| Clamping Voltage (VC) | 37.5 V max @ 40 A IPP - limits protected circuit voltage during worst-case surge |
| Response Time | <1.0 ns - ensures clamping initiates before transient propagates into downstream ICs |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
| UL Recognition | UL 497B certified for isolated loop circuit protection - validated for telecom and industrial safety compliance |
Pinout & Package
1.5SMC27AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a cathode-indicated molded notch and modified L-bend leads for enhanced pad adhesion. The package is void-free thermosetting plastic, RoHS-compliant, and rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side reference in unidirectional protection configuration |
| Cathode | Zener breakdown terminal | Connected to protected line (e.g., 24 V rail); conducts when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W surge rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV line-to-earth) surges without derating |
| UL 497B recognition | Validates suitability for isolated communication loops in industrial gateways and PLC I/O modules |
| Low clamping ratio (VC/VBR = 1.39) | Minimizes overvoltage stress on downstream DC-DC converters and microcontrollers |
| AEC-Q101 qualified (SZ variant) | Confirms reliability for automotive body electronics and infotainment power rails |
| Pb-free SURMETIC® package | Ensures long-term solder joint integrity and compliance with global environmental directives |
Applications
| Automotive Body Control Module | Industrial 24 V Power Supply Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay drivers from load dump and jump-start transients in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS placed across 12–24 V supply rail to clamp spikes up to 120 V. Use Value: Prevents latch-up or destruction of MCUs and CAN/LIN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding AC-DC and DC-DC converter inputs in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V auxiliary rail subjected to field-wiring faults and inductive kickback. Use Value: Limits transient overshoot to ≤37.5 V, preserving input capacitor lifetime and MOSFET gate oxide integrity. |
| Medical Equipment Power Entry | Telecom Isolated Data Line |
Use Scenario: Surge protection at mains-derived 24 V DC power entry points in diagnostic imaging subsystems. IC Role / Device Role / Timing Role: First-stage transient suppressor upstream of EMI filters and primary regulators. Use Value: Meets IEC 60601-1 collateral standard for applied part transient immunity with UL 497B validation. |
Use Scenario: Protection of RS-485 transceiver power pins in isolated backplane interfaces for base station control cards. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to isolated 3.3 V or 5 V supply, guarding against ground potential differences. Use Value: Enables reliable operation under ±15 kV ESD contact discharge while maintaining signal integrity on differential pairs. |
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 | 600 W rating, 24 V VRWM, SMB package (smaller footprint, lower surge capacity) | Suitable for space-constrained consumer electronics where 1500 W margin is not required | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 Level 3 |
| 1.5KE27A | Through-hole DO-201 package, same 27 V VBR but slower response (~1.5 ns) and no UL 497B listing | Used in legacy industrial power supplies where reworkability outweighs surface-mount density | Choose only if through-hole assembly is mandated and UL certification is not required |
Compared with SMBJ24A and 1.5KE27A, the 1.5SMC27AT3 delivers higher surge robustness in a compact SMC package with certified isolation-loop safety - making it optimal for new designs targeting automotive, industrial, and medical compliance.
Availability
1.5SMC27AT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24 V power supply inputs, and medical equipment power entry points requiring stable component supply and full regulatory traceability.
Supply support for 1.5SMC27AT3 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 energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1.5SMC27AT3 belongs to the SMC-series transient voltage suppressors, engineered specifically for high-reliability unidirectional surge protection in harsh electrical environments with strict safety certification requirements.
FAQ
What is the clamping voltage of the 1.5SMC27AT3 at its rated peak pulse current?
The 1.5SMC27AT3 has a maximum clamping voltage (VC) of 37.5 V at 40 A peak pulse current (IPP), measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected circuits remain below critical overvoltage thresholds during surge events, directly supporting design margin calculations for downstream components like DC-DC controllers and interface ICs.
Is the 1.5SMC27AT3 suitable for automotive applications?
Yes - the 1.5SMC27AT3 is AEC-Q101 qualified in its SZ-prefix variant (e.g., SZ1.5SMC27AT3G), confirming reliability for automotive under-hood and body electronics. While the base 1.5SMC27AT3 is industrial-grade, its electrical specs - including 23.1 V VRWM, 37.5 V clamping, and 1500 W surge rating - align with ISO 7637-2 Pulse 1, 2a, and 5a requirements when properly implemented with appropriate series impedance.
Does the 1.5SMC27AT3 have UL 497B certification?
Yes - the entire 1.5SMCxxAT3G series, including the 1.5SMC27AT3, carries UL 497B recognition (File #E210057) for isolated loop circuit protection. This certification validates performance in telecom and industrial data line applications where galvanic isolation and surge withstand in secondary circuits are mandatory, distinguishing it from generic TVS diodes lacking third-party safety validation.
What is the thermal resistance of the 1.5SMC27AT3 on a standard PCB?
The 1.5SMC27AT3 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 footprint (Case 403 outline). This value assumes natural convection cooling and informs derating calculations - for example, at 75°C ambient, maximum continuous power drops to 0.75 W, though transient surge capability remains unaffected.
How does the 1.5SMC27AT3 differ from bidirectional TVS diodes?
The 1.5SMC27AT3 is unidirectional and functions only as a reverse-biased Zener clamp, blocking forward current beyond ~3.5 V VF. Unlike bidirectional variants, it cannot suppress negative-going transients on AC lines or symmetric signals. Its design targets DC power rails and single-polarity interfaces - such as 24 V industrial buses - where polarity is fixed and reverse surge protection is the sole requirement.
1.5SMC27AT3 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1.5SMC27AT3 FAQ
1.How can I place an order for 1.5SMC27AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC27AT3 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 1.5SMC27AT3 reliable?
The price and inventory of 1.5SMC27AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC27AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC27AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC27AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC27AT3?
1.5SMC27AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC27AT3 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 1.5SMC27AT3?
For technical support, including 1.5SMC27AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC27AT3 requirements.
6.How does Aetrix verify that 1.5SMC27AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC27AT3 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 1.5SMC27AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC27AT3?
All 1.5SMC27AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC27AT3, 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 1.5SMC27AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC27AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC27AT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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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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Diodes Incorporated
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