My Inquiry
My Account
onsemi 1SMC17AT3
- Part No.:
- 1SMC17AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC17AT3.pdf
- Description:
- TVS DIODE 17VWM 27.6VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:8,930
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMC17AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning-induced surges, and inductive switching transients. It features a 17 V working peak reverse voltage (VRWM), 20.9 V maximum clamping voltage (VC) at 1 A peak pulse current, and sub-1 ns response time. It is commonly deployed in automotive power line protection and industrial DC power supply inputs.
For engineers reviewing the 1SMC17AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, VC margin relative to protected IC absolute maximum ratings, UL 497B certification for isolated loop compliance, and SMC package thermal performance under repetitive surge conditions.
Technical Context
The 1SMC17AT3 operates as a Zener-based avalanche clamp, triggered when reverse voltage exceeds its 18.9 V nominal breakdown voltage (VBR) at 1 mA test current. Its low zener impedance and fast intrinsic carrier response enable clamping within <1 ns, minimizing overshoot before suppression engages.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 μs waveform), with thermal derating starting above 75°C junction temperature. The device is Pb-free, RoHS-compliant, and qualified per UL 497B for isolated loop circuit protection - a requirement for telecom and industrial interface ports.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17 V - Maximum continuous reverse operating voltage; must be ≥ system DC bus or signal swing to avoid leakage conduction during normal operation. |
| VBR (min/typ/max) | 18.9 V @ 1 mA - Breakdown threshold; defines onset of clamping; tight tolerance ensures predictable turn-on across temperature. |
| VC @ IPP | 27.6 V @ 1 A - Clamped voltage seen by protected circuit during full-rated surge; determines headroom required for downstream ICs. |
| IPP | 53.3 A - Peak pulse current capability at 1 ms pulse width; defines maximum surge energy (1500 W) the device can absorb without failure. |
| IR @ VRWM | 5 μA - Reverse leakage at 17 V; negligible power loss and no measurable loading on 12–15 V supply rails. |
| Response Time | <1 ns - Enables suppression before transient energy couples into sensitive nodes; critical for protecting high-speed interfaces and microcontrollers. |
| UL Recognition | UL 497B QVGQ2 - Certified for use in isolated loop protectors; validates performance under strike voltage, endurance, and dielectric withstand tests. |
Pinout & Package
1SMC17AT3 is housed in an SMC (DO-214AB) surface-mount plastic package (Case 403), featuring a modified L-bend leadform for enhanced solder joint reliability and thermal transfer. Cathode is marked by a molded polarity notch on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential rail; forms return path for clamped surge current. |
| Cathode | High-side transient input | Connected to protected line (e.g., 12 V supply rail); voltage applied here triggers avalanche breakdown when exceeding VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12–24 V DC lines without derating. |
| UL 497B recognition | Validates suitability for safety-critical isolated loop applications such as RS-485 fieldbus, PoE injectors, and process sensor interfaces. |
| ESD rating >16 kV HBM | Provides built-in immunity to human-body-model ESD events, reducing need for upstream discrete ESD protection in handheld or serviceable equipment. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage stress on downstream components - critical for safeguarding 3.3 V or 5 V logic powered from protected rails. |
| Pb-free Surmetic package | Meets RoHS and ELV directives; thermally robust (260°C/10 s soldering) and corrosion-resistant for automotive and industrial reflow environments. |
Applications
| Automotive Power Line Protection | Industrial DC Power Input |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤27.6 V, preventing damage to 36 V-rated input stages while maintaining UL 497B compliance for functional safety systems. | Use Scenario: 24 V PLC power supply input subjected to inductive kickback from solenoid drivers and relay coils. IC Role / Device Role / Timing Role: Primary surge suppression element mounted directly at connector entry point. Use Value: Absorbs 1500 W pulses with <1 ns response, ensuring downstream regulators and microcontrollers see no overshoot beyond safe operating limits. |
| Medical Equipment Power Rails | Telecom Interface Protection |
Use Scenario: Auxiliary 12 V supply in diagnostic imaging devices requiring low-leakage, certified protection per IEC 60601-1. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary fuse and MOV, providing precise, low-capacitance suppression. Use Value: 5 μA leakage at 17 V avoids signal integrity issues in precision analog front-ends; UL 497B supports regulatory submission. | Use Scenario: Isolated RS-485 transceiver power and signal lines in building automation controllers. IC Role / Device Role / Timing Role: UL 497B-certified TVS on isolated VCC and data lines to meet ANSI/TIA-568-C surge requirements. Use Value: Enables single-device compliance for both power and signal side protection in Class 2 isolated loops without additional certification burden. |
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) and VC (27.6 V), but lower 600 W peak power rating and SMB package (smaller thermal mass). | Less suitable for repeated surge exposure or high-temperature ambient (>85°C) industrial enclosures. | Select 1SMC17AT3 when 1500 W surge handling, UL 497B certification, or higher thermal robustness is required. |
| 1.5SMC17A | Identical electrical specs and SMC package, but obsolete marking and no Pb-free designation (non-RoHS compliant). | Not acceptable for new designs targeting EU/China RoHS or automotive PPAP. | Choose 1SMC17AT3 for full regulatory compliance, traceable Pb-free sourcing, and active manufacturer support. |
Compared with SMBJ17A and 1.5SMC17A, the 1SMC17AT3 delivers higher surge energy absorption, mandatory UL 497B listing for isolated circuits, and guaranteed RoHS compliance - making it the preferred choice for safety-critical, high-reliability, and production-ready designs.
Availability
1SMC17AT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC power inputs, medical auxiliary supplies, and telecom interface protection requiring stable component supply across multi-year production cycles.
Supply support for 1SMC17AT3 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 specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and communications markets.
The 1SMC17AT3 belongs to the SMC-series Zener TVS family, engineered for high-energy transient suppression in harsh environments where reliability, certification, and thermal resilience are critical design requirements.
FAQ
What is the maximum clamping voltage of the 1SMC17AT3 under full-rated surge conditions?
The 1SMC17AT3 has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated 1 A peak pulse current (IPP), measured using the standard 10/1000 μs waveform. This value is specified in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet and represents the highest voltage the protected circuit will experience during a full 1500 W transient event. Designers must ensure downstream components have sufficient voltage margin above this 27.6 V clamping level.
Does the 1SMC17AT3 meet UL 497B requirements for isolated loop protection?
Yes, the 1SMC17AT3 is explicitly recognized under UL 497B (File #E210057, category QVGQ2) for use in isolated loop protectors. This certification confirms successful completion of strike voltage breakdown, endurance conditioning, temperature, dielectric withstand, and discharge testing - making it suitable for RS-485, PoE, and other isolated interface applications where regulatory compliance is mandatory. The "G" suffix denotes the Pb-free version covered by this listing.
What is the reverse leakage current of the 1SMC17AT3 at its working voltage?
The 1SMC17AT3 exhibits a maximum reverse leakage current (IR) of 5 μA when biased at its 17 V working peak reverse voltage (VRWM) and tested at 25°C. This ultra-low leakage ensures minimal power loss and no measurable loading on 12 V or 24 V supply rails during normal operation, preserving efficiency and avoiding false triggering in precision sensing or low-power standby circuits.
Can the 1SMC17AT3 be used in automotive load dump protection?
Yes, the 1SMC17AT3 is routinely applied in automotive 12 V power line protection against ISO 7637-2 Pulse 5a (load dump), due to its 1500 W peak power rating, 27.6 V clamping voltage, and ability to handle repetitive surges when properly heatsinked. Its SMC package provides adequate thermal mass, and its UL 497B certification supports functional safety documentation for ASIL-B systems where transient suppression is part of the safety chain.
What is the package type and lead finish of the 1SMC17AT3?
The 1SMC17AT3 uses the SMC (DO-214AB) surface-mount package (Case 403), with a Pb-free matte tin lead finish compliant with RoHS and JEDEC J-STD-020 reflow profiles. The package features a modified L-bend leadform for improved solder joint strength and thermal conduction, and is rated for 260°C for 10 seconds during reflow soldering - meeting IPC-A-610 Class 3 requirements for high-reliability assemblies.
1SMC17AT3 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 53.3A
- 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
1SMC17AT3 FAQ
1.How can I place an order for 1SMC17AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC17AT3 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 1SMC17AT3 reliable?
The price and inventory of 1SMC17AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC17AT3 is usually 5 days.
3.What payment methods are accepted for 1SMC17AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC17AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC17AT3?
1SMC17AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC17AT3 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 1SMC17AT3?
For technical support, including 1SMC17AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC17AT3 requirements.
6.How does Aetrix verify that 1SMC17AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMC17AT3 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 1SMC17AT3 meets industry standards.
7.What is the process for return or replacement of 1SMC17AT3?
All 1SMC17AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC17AT3, 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 1SMC17AT3 part is unused and in its original packaging.
Return procedure for 1SMC17AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC17AT3 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
