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onsemi SZNUP3105LT3G
- Part No.:
- SZNUP3105LT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZNUP3105LT3G.pdf
- Description:
- TVS DIODE 32VWM 66VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:15,951
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Product details
Overview
SZNUP3105LT3G from onsemi is a dual-line bidirectional ESD protection diode in SOT-23 package, designed specifically for CAN bus transceiver protection in 24 V automotive and industrial systems. It delivers 350 W peak power dissipation per line (8/20 µs), clamps at ≤59 V @ 5 A, and exhibits ≤30 pF line-to-ground capacitance to preserve high-speed CAN signal integrity.
For engineers reviewing the SZNUP3105LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 Level 4 ESD immunity (±30 kV contact), AEC-Q101 qualification, low leakage (<100 nA @ 32 V), and compact SOT-23 footprint for space-constrained CAN node layouts.
Technical Context
The SZNUP3105LT3G integrates two identical bidirectional Zener-based surge protection elements in a single SOT-23 package, each protecting one CAN data line (CAN_H and CAN_L). Its clamping behavior relies on reverse-biased breakdown (35.6 V typical) plus forward diode drop, achieving VC ≤59 V at IPP = 5 A under 8/20 µs transients.
It meets stringent system-level immunity standards: IEC 61000-4-4 (50 A EFT), IEC 61000-4-5 (8.0 A lightning surge), and supports fault-tolerant CAN operation with ±32 V reverse working voltage and −55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 350 W per line (8/20 µs waveform); sustains transient energy without failure in CAN bus overvoltage events |
| Clamping Voltage | ≤59 V @ 5 A IPP; limits voltage seen by downstream CAN transceiver during ESD/EFT surges |
| Reverse Working Voltage | 32 V; matches nominal 24 V CAN systems with margin for ripple and transients |
| Capacitance | 30 pF line-to-GND @ 1 MHz; preserves signal rise/fall times for high-speed CAN (up to 1 Mbps) |
| ESD Rating | ±30 kV contact per IEC 61000-4-2 Level 4; exceeds automotive EMC requirements |
| Operating Temperature | −55 °C to +150 °C; supports under-hood and industrial control environments |
| AEC-Q101 Qualified | Yes; validated for automotive-grade reliability and PPAP-capable production |
Pinout & Package
SZNUP3105LT3G uses the SOT-23 (TO-236) package (2.90 × 1.30 × 1.00 mm, 1.90 mm pitch), case 318, style 27 - confirmed per onsemi mechanical drawing 98ASB42226B. Pin 1 and Pin 2 are cathodes for CAN_H and CAN_L lines respectively; Pin 3 is common cathode connection to ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (Line 1) | Connects to CAN_H signal path; forms bidirectional clamp with internal Zener structure |
| Pin 2 | Cathode (Line 2) | Connects to CAN_L signal path; enables independent, symmetrical protection per differential line |
| Pin 3 | Common Cathode / GND Reference | Provides shared low-impedance return path to system ground for both protection paths |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line bidirectional protection | Single SOT-23 package protects both CAN_H and CAN_L with matched clamping characteristics |
| Low capacitance (30 pF) | Minimizes signal distortion and timing skew in high-speed CAN networks (1 Mbps compliant) |
| IEC 61000-4-5 compliance (8.0 A) | Withstands lightning-induced surges in industrial fieldbus installations without degradation |
| UL 94 V-0 flammability rating | Meets safety standards for enclosure-integrated protection in certified industrial equipment |
| SZ prefix & AEC-Q101 qualification | Guarantees automotive-grade traceability, process control, and stress-test validation |
Applications
| Automotive CAN Nodes | Industrial CAN Gateways |
|---|---|
Use Scenario: Protection of body control modules and ECUs connected to high-speed CAN (500 kbps–1 Mbps) in passenger vehicles and light trucks. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between connector and CAN transceiver IC. Use Value: Enables compliance with ISO 11898-2 and OEM EMC specifications while maintaining signal fidelity via 30 pF capacitance. |
Use Scenario: Surge protection for CAN-to-Ethernet or CAN-to-Modbus gateways deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end ESD/EFT limiter on field-side CAN ports exposed to noisy industrial environments. Use Value: Survives 50 A EFT bursts (IEC 61000-4-4) and 8 A lightning surges (IEC 61000-4-5) without latch-up or parameter shift. |
| Fault-Tolerant CAN Systems | Smart Distribution Networks (SDS™) |
Use Scenario: Protection of nodes in redundant, low-speed (125 kbps) fault-tolerant CAN networks used in commercial vehicles and off-highway machinery. IC Role / Device Role / Timing Role: Dual-line clamp ensuring bus continuity during single-point failures while suppressing transients. Use Value: Maintains VRWM = 32 V and TJ range (−55 °C to +150 °C) across extended temperature cycles and vibration profiles. |
Use Scenario: ESD hardening of CAN nodes in smart circuit breakers and load controllers within utility distribution panels. IC Role / Device Role / Timing Role: Interface-level protector for CAN physical layer in UL-listed, arc-flash-rated enclosures. Use Value: UL 94 V-0 rating and Pb-free/Halogen-free construction support safety certification and RoHS compliance for grid infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Lower clamping voltage (≤12 V @ 1 A), but rated only to 3.6 V VRWM; 12 pF capacitance | Targeted at low-voltage USB/I²C interfaces, not 24 V CAN systems | Select only for sub-5 V data lines; unsuitable for CAN due to insufficient VRWM and thermal derating |
| SM712.TCT | Higher VRWM (12 V), unidirectional configuration, 100 pF capacitance, TO-236AB package | Designed for RS-485/RS-232, lacks dual-line symmetry and AEC-Q101 qualification | Acceptable for non-automotive industrial serial buses; not recommended for CAN-H/L differential pair protection |
Compared with TPD2E001DRYR and SM712.TCT, the SZNUP3105LT3G uniquely combines 32 V VRWM, dual-line bidirectional topology, 30 pF capacitance, and AEC-Q101 qualification-making it the only option validated for automotive and industrial 24 V CAN transceiver protection without layout or BOM redesign.
Availability
SZNUP3105LT3G is available at Aetrix Electronics and suitable for automotive ECU designs, industrial CAN gateways, and fault-tolerant vehicle network nodes requiring stable component supply and long-term lifecycle support.
Supply support for SZNUP3105LT3G 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
onsemi is a global semiconductor manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with core expertise in analog, power, and sensing technologies.
The SZNUP3105LT3G belongs to onsemi's transient voltage suppression diode product line, engineered specifically for robust, standards-compliant interface protection in harsh electromagnetic environments.
FAQ
What is the primary function of the SZNUP3105LT3G in a CAN bus system?
The SZNUP3105LT3G serves as a dual-line bidirectional ESD and surge protection device for CAN_H and CAN_L signals. It clamps transient voltages-such as those from ESD, EFT, or lightning surges-to safe levels (≤59 V @ 5 A) before they reach the CAN transceiver. Its 32 V reverse working voltage and 350 W peak power rating ensure reliable operation in 24 V automotive and industrial CAN networks without compromising signal integrity.
Is the SZNUP3105LT3G qualified for automotive use?
Yes, the SZNUP3105LT3G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It has undergone rigorous stress testing-including temperature cycling, HTRB, and ESD-per automotive reliability standards. This makes the SZNUP3105LT3G suitable for under-hood and chassis-mounted CAN nodes where ambient temperatures range from −55 °C to +150 °C.
How does the SZNUP3105LT3G achieve low capacitance while delivering high surge protection?
The SZNUP3105LT3G achieves 30 pF line-to-ground capacitance through optimized Zener junction geometry and low-parasitic SOT-23 packaging. Its internal structure uses tightly controlled doping and junction area to balance low capacitance with high peak power handling (350 W). This design allows the SZNUP3105LT3G to protect high-speed CAN (1 Mbps) without distorting edge rates or increasing bit error rate.
What standards does the SZNUP3105LT3G meet for electromagnetic immunity?
The SZNUP3105LT3G meets IEC 61000-4-2 Level 4 (±30 kV contact), IEC 61000-4-4 (50 A EFT, 5/50 ns), and IEC 61000-4-5 (8.0 A lightning, 8/20 µs). These certifications confirm its ability to suppress real-world transients encountered in automotive and industrial settings-enabling system-level compliance without additional external filtering components.
Can the SZNUP3105LT3G be used in fault-tolerant CAN (FT-CAN) applications?
Yes, the SZNUP3105LT3G is explicitly referenced in onsemi documentation for fault-tolerant CAN protection. Its dual-line architecture, symmetric clamping, 32 V VRWM, and operation across −55 °C to +150 °C make it compatible with FT-CAN physical layers. The SZNUP3105LT3G maintains bus functionality during single-line faults while suppressing transients that could otherwise disrupt differential signaling or damage transceivers.
SZNUP3105LT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 32V (Max)
- Voltage - Breakdown (Min):
- 35.6V
- Voltage - Clamping (Max) @ Ipp:
- 66V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- CAN
- Capacitance @ Frequency:
- 30pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZNUP3105LT3G FAQ
1.How can I place an order for SZNUP3105LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNUP3105LT3G 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 SZNUP3105LT3G reliable?
The price and inventory of SZNUP3105LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNUP3105LT3G is usually 5 days.
3.What payment methods are accepted for SZNUP3105LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNUP3105LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNUP3105LT3G?
SZNUP3105LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNUP3105LT3G 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 SZNUP3105LT3G?
For technical support, including SZNUP3105LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNUP3105LT3G requirements.
6.How does Aetrix verify that SZNUP3105LT3G is sourced from the original manufacturer or authorized distributors?
All SZNUP3105LT3G 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 SZNUP3105LT3G meets industry standards.
7.What is the process for return or replacement of SZNUP3105LT3G?
All SZNUP3105LT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZNUP3105LT3G, 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 SZNUP3105LT3G part is unused and in its original packaging.
Return procedure for SZNUP3105LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZNUP3105LT3G Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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