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onsemi 1SMB17AT3
- Part No.:
- 1SMB17AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB17AT3.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,366
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Product details
Overview
1SMB17AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 17 V working peak reverse voltage (VRWM), 20.9 V maximum breakdown voltage (VBR) at 1.0 mA test current, and clamps to 27.6 V at 21.7 A peak pulse current (IPP), with <1.0 ns response time and <5.0 µA leakage above 10 V. It is widely deployed in automotive power line protection and industrial power supply surge suppression.
For engineers reviewing the 1SMB17AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. system DC bus, clamping voltage headroom relative to IC absolute maximum ratings, peak pulse current capability under IEC 61000-4-5 waveform, and UL 497B certification for isolated loop protection.
Technical Context
The 1SMB17AT3 operates as a voltage-clamping device in avalanche breakdown mode, triggered when transient voltage exceeds its specified VBR range (18.9–20.9 V). Its low zener impedance and fast sub-nanosecond response enable effective suppression of ESD (Class 3 >16 kV HBM) and lightning-induced surges.
It is rated for 600 W non-repetitive peak power (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature. The device uses a Surmetic SMB package with modified L-bend leads, enabling surface-mount assembly on FR-4 PCBs with ON Semiconductor's recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17 V - Maximum continuous reverse operating voltage; must be ≥ circuit's DC or peak steady-state voltage to avoid leakage conduction. |
| VBR @ IT = 1.0 mA | 18.9–20.9 V - Breakdown onset range; defines minimum voltage at which avalanche conduction begins under controlled test conditions. |
| VC @ IPP = 21.7 A | 27.6 V - Clamping voltage during full-rated 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPK | 600 W - Peak pulse power handling (1 ms pulse); validates robustness against IEC 61000-4-5 Level 4 surges (4 kV line-earth). |
| IR @ VRWM | 5.0 µA max - Reverse leakage at 17 V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Response Time | <1.0 ns - Time from transient onset to clamping activation; critical for protecting fast logic and communication interfaces. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates compliance with safety requirements for telecom and industrial interfaces. |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode band marking; dimensions: 4.32 mm × 2.13 mm × 2.26 mm (L × W × H); lead finish is Pb-free (G suffix variant confirmed).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to protected circuit ground or low-side return path; carries full surge current during transient events. |
| Cathode | High-voltage input node | Connected to line being protected (e.g., 12 V battery rail); polarity band identifies this terminal; reverse-biased under normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) without degradation in standard PCB layouts. |
| UL 497B recognition | Validates suitability for certified isolated loop protection in telecom, process control, and medical auxiliary circuits. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 (±8 kV contact / ±15 kV air) without external shielding or layout mitigation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during fast transients, preserving margin below IC absolute maximum ratings. |
| Surmetic SMB package | Enables automated SMT placement and reflow; qualified for 260°C/10 s soldering; corrosion-resistant finish ensures long-term reliability. |
Applications
| Automotive Power Line Protection | Industrial DC Power Supply Input |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V/100 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp overvoltage before it reaches LDO or DC-DC controller. Use Value: Clamps to 27.6 V at 21.7 A, providing ≥12 V margin below typical 40 V absolute max rating of automotive-grade regulators. |
Use Scenario: 24 V industrial PLC power input subjected to switching transients from relay coils and motor drives. IC Role / Device Role / Timing Role: Primary surge shunt on main DC input, upstream of filtering and isolation stages. Use Value: 600 W peak power rating handles repetitive 10/1000 µs surges per IEC 61000-4-4 (Level 3, 2 kV), maintaining stable operation across temperature. |
| Medical Equipment Auxiliary Power | Telecom Isolated Interface Protection |
|
Use Scenario: Low-power auxiliary 5 V/3.3 V rails in diagnostic imaging systems requiring UL-certified surge protection. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC-DC output, safeguarding analog front-end and sensor interface ICs. Use Value: UL 497B QVGQ2 listing confirms compliance for patient-connected equipment where isolation barrier integrity is safety-critical. |
Use Scenario: RS-485 or CAN bus lines in building automation gateways connected to long outdoor cables. IC Role / Device Role / Timing Role: Line-side TVS on differential pair, referenced to isolated ground plane. Use Value: Sub-1 ns response prevents data corruption during ESD events; low capacitance (915 pF) avoids signal edge degradation at 1 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ17A | Same VRWM (17 V), identical SMB package, but lower PPK = 600 W (same rating), higher VC = 28.8 V at 21.0 A. | Marginally higher clamping voltage reduces design margin for 3.3 V/5 V logic protection; otherwise functionally interchangeable in 12–24 V systems. | Select SMBJ17A only if legacy BOM alignment or distributor stock availability outweighs 1.2 V clamping penalty. |
| 1.5SMC17A | Higher PPK = 1500 W, DO-214AB package (larger footprint), VRWM = 17 V, VC = 27.6 V at 54.3 A. | Requires PCB redesign due to larger case (7.11 mm × 6.22 mm); suited for higher-energy surges where 1SMB17AT3 may fatigue over repeated events. | Choose 1.5SMC17A when system-level testing reveals 1SMB17AT3 clamping instability under multi-pulse stress (e.g., motor drive regeneration). |
Compared with SMBJ17A and 1.5SMC17A, the 1SMB17AT3 offers optimal balance of compact SMB footprint, UL 497B certification, and tight 27.6 V clamping-making it preferred for space-constrained, safety-certified 12–24 V industrial and automotive modules where board area and regulatory compliance are prioritized over extreme energy handling.
Availability
1SMB17AT3 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and medical auxiliary power supplies requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1SMB17AT3 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 1SMB17AT3 belongs to the SMB series of unidirectional TVS diodes engineered for cost-effective, high-reliability surge protection in harsh environments-targeting applications where UL certification, fast response, and consistent clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of the 1SMB17AT3 under rated surge conditions?
The 1SMB17AT3 clamps to a maximum of 27.6 V when subjected to its rated peak pulse current of 21.7 A (10/1000 µs waveform). This value is measured per the test conditions defined in the ON Semiconductor datasheet and represents the upper limit of voltage seen by downstream circuitry during a full-rated transient event. Designers must ensure this clamping voltage remains below the absolute maximum ratings of protected ICs. The 1SMB17AT3 achieves this while maintaining low leakage and fast response.
Is the 1SMB17AT3 RoHS compliant and halogen-free?
Yes, the 1SMB17AT3 is RoHS compliant and halogen-free. The "G" suffix in the full ordering part number (1SMB17AT3G) explicitly denotes the Pb-free, halogen-free Surmetic SMB package. ON Semiconductor's documentation confirms compliance with JEDEC JS709 and IEC 61249-2-21 standards. The 1SMB17AT3 meets all applicable environmental regulations for sale in EU, US, and Asia-Pacific markets without restriction.
Can the 1SMB17AT3 be used in bidirectional signal line protection?
No, the 1SMB17AT3 is a unidirectional TVS diode and is not suitable for bidirectional signal line protection such as USB, HDMI, or RS-232. Its asymmetrical IV curve conducts only in reverse breakdown; forward conduction is limited to ~3.5 V at 30 A. For bidirectional applications, ON Semiconductor offers the 1SMB17CAT3 (complementary bidirectional variant) or dedicated arrays like the NUP4105MR6T1G. Using 1SMB17AT3 on AC-coupled or differential lines risks forward conduction and signal distortion.
What is the thermal resistance from junction-to-lead (RJL) for the 1SMB17AT3?
The thermal resistance from junction-to-lead (RJL) for the 1SMB17AT3 is 40 °C/W, measured under conditions of zero lead length on an FR-4 board. This parameter governs heat transfer from the silicon die to the PCB copper via the lead frame. When mounted using ON Semiconductor's recommended minimum footprint (Case 403A outline), the device supports 3.0 W DC power dissipation at 75°C lead temperature, with linear derating above that point. This RJL value enables reliable operation in thermally constrained automotive and industrial enclosures.
Does the 1SMB17AT3 meet IEC 61000-4-5 surge immunity requirements?
The 1SMB17AT3 is rated for 600 W peak pulse power with a 10/1000 µs waveform, directly aligning with IEC 61000-4-5 Level 3 (2 kV line-earth) and Level 4 (4 kV line-earth) test profiles when applied with appropriate series impedance. Its 27.6 V clamping voltage and <1.0 ns response ensure effective suppression of standardized surges. System-level validation is required, but the 1SMB17AT3 provides the foundational protection element needed to pass these tests in properly designed circuits.
1SMB17AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 915pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB17AT3 FAQ
1.How can I place an order for 1SMB17AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB17AT3 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 1SMB17AT3 reliable?
The price and inventory of 1SMB17AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB17AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB17AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB17AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB17AT3?
1SMB17AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB17AT3 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 1SMB17AT3?
For technical support, including 1SMB17AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB17AT3 requirements.
6.How does Aetrix verify that 1SMB17AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB17AT3 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 1SMB17AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB17AT3?
All 1SMB17AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB17AT3, 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 1SMB17AT3 part is unused and in its original packaging.
Return procedure for 1SMB17AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB17AT3 Tags
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