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onsemi SZNUP2105LT3G
- Part No.:
- SZNUP2105LT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZNUP2105LT3G.pdf
- Description:
- TVS DIODE 24VWM 44VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:20,341
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Product details
Overview
SZNUP2105LT3G from onsemi is a dual bidirectional ESD protection diode in SOT-23 package, designed specifically for CAN bus line protection with 24 V working peak reverse voltage, 350 W peak pulse power per line, and clamping voltage ≤37 V at 8 A (8/20 µs), deployed in automotive and industrial high-speed CAN transceiver interfaces.
For engineers reviewing the SZNUP2105LT3G datasheet, pinout, applications, or equivalent options, key selection criteria include IEC 61000-4-2 Level 4 (±30 kV contact), ISO 7637-3 Pulse 3a/b robustness (50 A), low 26–30 pF line-to-ground capacitance, and AEC-Q101 qualification for automotive CAN systems.
Technical Context
The SZNUP2105LT3G implements a dual Zener-based bidirectional clamp architecture optimized for transient suppression on differential CAN_H/CAN_L lines. It delivers symmetrical clamping behavior with breakdown voltage of 26.2–32 V (at 1 mA) and dynamic resistance ≤1 Ω under TLP stress.
Its design integrates two matched Zener junctions per line to ensure balanced voltage limiting during ±ESD events, while maintaining sub-100 nA reverse leakage at 24 V and meeting stringent EMI immunity requirements including IEC 61000-4-4 (40 A EFT) and ISO 7637-2 Pulse 2a (9.5 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 24 V - matches ISO 11898-2 CAN bus common-mode range and ensures no conduction during normal 12 V system operation. |
| Breakdown Voltage | 26.2–32 V @ 1 mA - defines turn-on threshold for transient clamping without false triggering on signal edges. |
| Clamping Voltage | ≤37 V @ 8 A (8/20 µs) - limits transceiver stress below absolute maximum ratings during lightning/surge events. |
| Peak Pulse Power | 350 W per line - sustains single-event energy absorption without thermal runaway in compact SOT-23 footprint. |
| Line-to-Ground Capacitance | 26–30 pF @ 0 V, 1 MHz - preserves signal integrity up to 1 Mbps CAN data rate with minimal rise-time degradation. |
| Reverse Leakage Current | ≤100 nA @ 24 V - avoids DC loading on CAN bus bias networks and prevents quiescent current drift. |
| ESD Rating | ±30 kV IEC 61000-4-2 contact - exceeds automotive OEM requirements for touch-point ESD immunity. |
Pinout & Package
SOT-23 (TO-236) package, 2.90 mm × 1.30 mm × 1.00 mm, 3-pin surface-mount with gull-wing leads. Pin 1 marked by dot or "27E" code; Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Line 1) | Connects to CAN_H for bidirectional clamping; forms one half of dual-Zener pair protecting Line 1. |
| Pin 2 | Anode (Line 2) | Connects to CAN_L for symmetrical bidirectional clamping; enables compact dual-line protection in single package. |
| Pin 3 | Cathode (Common Ground) | Shared cathode node tied to system ground; establishes reference for both Zener clamps and minimizes layout area. |
Key Features
| Feature | Design Value |
|---|---|
| Dual bidirectional Zener architecture | Enables simultaneous protection of CAN_H and CAN_L with matched clamping thresholds and no polarity dependency. |
| AEC-Q101 qualified | Validated for automotive temperature range (−55 °C to +150 °C) and mechanical stress, supporting PPAP compliance. |
| IEC 61000-4-2 Level 4 certified | Guarantees survivability against ±30 kV contact discharge-critical for infotainment, gateway, and body control modules. |
| ISO 7637-3 Pulse 3a/b rated | Withstands 50 A fast transients on data lines-meets industrial SDS® and DeviceNet™ surge immunity requirements. |
| Low 26–30 pF capacitance | Minimizes signal distortion and reflection on high-speed CAN buses operating up to 1 Mbps over 40 m. |
Applications
| Automotive High-Speed CAN | Industrial DeviceNet™ Networks |
|---|---|
|
Use Scenario: Protection of CAN transceivers in engine control units (ECUs), ADAS domain controllers, and battery management systems exposed to vehicle-level ESD and load-dump coupling. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor placed between CAN controller IC and physical layer transceiver, clamping surges before they reach sensitive silicon. Use Value: Prevents latch-up or permanent damage to CAN PHY ICs during ±30 kV ESD events and maintains <1 µs response time to 8/20 µs surges. |
Use Scenario: Surge hardening of DeviceNet™ nodes in factory automation PLCs, motor drives, and sensor hubs operating in electrically noisy plant environments. IC Role / Device Role / Timing Role: Dual-line ESD protector mounted directly at connector interface to shunt fast transients induced by relay switching and VFD noise. Use Value: Enables compliance with Rockwell Automation DeviceNet™ physical layer spec requiring ≥8 kV contact ESD and 50 A ISO 7637-3 Pulse 3a/b immunity. |
| Smart Distribution Systems (SDS®) | Fault-Tolerant CAN Networks |
|
Use Scenario: EMI mitigation in Honeywell SDS® smart lighting and HVAC control networks deployed across commercial buildings with long cable runs. IC Role / Device Role / Timing Role: Low-capacitance line protector ensuring signal fidelity while absorbing repetitive EFT bursts (IEC 61000-4-4, 40 A) on distributed bus segments. Use Value: Maintains >125 kbps data integrity over 500 m cable lengths without added jitter or bit errors due to capacitive loading. |
Use Scenario: Redundant CAN bus protection in rail signaling, medical imaging equipment, and marine navigation systems where fault tolerance mandates dual-path reliability. IC Role / Device Role / Timing Role: Symmetrical dual-clamp device providing identical protection on both dominant and recessive bus states, preserving differential voltage margins. Use Value: Ensures continued bus arbitration and error frame generation even after exposure to 9.5 A ISO 7637-2 Pulse 2a transients on 24 V supply-coupled lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-line CAN bus ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Single-channel, 1.5 pF capacitance, lower 120 W peak power, no ISO 7637-3 rating. | Targeted at USB/low-speed digital I/O, not automotive CAN; insufficient for 1 Mbps or EFT-heavy environments. | Select only for space-constrained non-automotive designs where ultra-low capacitance outweighs surge robustness. |
| SM712-TR | Higher 12 V working voltage, 600 W peak power, but 65 pF capacitance and no AEC-Q101 qualification. | Used in telecom/datacom surge protection; excessive capacitance degrades CAN signal integrity above 500 kbps. | Prefer for 12 V RS-485 or PoE applications-not suitable for high-speed CAN due to bandwidth limitation. |
Compared with SZNUP2105LT3G, TPD2E001DRYR offers lower parasitic capacitance but lacks automotive qualification and CAN-specific surge ratings, while SM712-TR provides higher power handling at the cost of signal bandwidth-making SZNUP2105LT3G the only option balancing AEC-Q101, 1 Mbps compatibility, and full ISO/IEC compliance in SOT-23.
Availability
SZNUP2105LT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial DeviceNet™ nodes, Smart Distribution Systems (SDS®), and fault-tolerant CAN networks requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SZNUP2105LT3G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NUP2105L family-including SZNUP2105LT3G-is engineered for CAN bus ESD and surge protection, targeting automotive and industrial applications demanding AEC-Q101 qualification, low capacitance, and multi-standard immunity.
FAQ
What is the primary function of the SZNUP2105LT3G in a CAN system?
The SZNUP2105LT3G serves as a dual bidirectional ESD and surge protection diode for CAN_H and CAN_L lines. It clamps transient voltages-such as those from ESD, EFT, or lightning-to safe levels (<37 V at 8 A) while remaining non-conductive during normal 24 V bus operation. Its Zener-based architecture ensures symmetrical protection without polarity constraints, making it integral to robust CAN transceiver front-end design.
Does the SZNUP2105LT3G meet automotive qualification standards?
Yes, the SZNUP2105LT3G carries the "SZ" prefix indicating AEC-Q101 qualification and PPAP capability. It is validated across −55 °C to +150 °C junction temperature range and tested to ISO 7637-2 Pulse 2a (9.5 A), ISO 7637-3 Pulse 3a/b (50 A), and IEC 61000-4-2 Level 4 (±30 kV contact), fulfilling core automotive EMC and reliability requirements.
What is the capacitance of the SZNUP2105LT3G and why does it matter for CAN?
The SZNUP2105LT3G exhibits 26–30 pF line-to-ground capacitance at 0 V and 1 MHz. This low value is critical for CAN: it preserves signal edge integrity, minimizes reflections, and supports reliable 1 Mbps operation over 40 m cable lengths-unlike higher-capacitance protectors that distort differential waveforms and increase bit error rates.
How does the SZNUP2105LT3G differ from generic TVS diodes in CAN applications?
Unlike generic unidirectional or high-capacitance TVS diodes, the SZNUP2105LT3G is purpose-built for CAN with dual bidirectional Zener clamping, matched channel characteristics, 24 V VRWM aligned to ISO 11898-2, and full certification to automotive and industrial surge standards (IEC 61000-4-4, ISO 7637-3). Its SOT-23 footprint also enables direct placement at connectors without compromising board space.
Can the SZNUP2105LT3G be used in both high-speed and fault-tolerant CAN networks?
Yes-the SZNUP2105LT3G is explicitly validated for both high-speed CAN (up to 1 Mbps) and fault-tolerant CAN topologies. Its low capacitance maintains timing margins, while its 350 W peak power rating and 50 A ISO 7637-3 Pulse 3a/b performance ensure resilience during bus faults, short circuits, and coupled transients in redundant or safety-critical implementations.
SZNUP2105LT3G 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):
- 24V (Min)
- Voltage - Breakdown (Min):
- 26.2V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 8A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- -
- 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)
SZNUP2105LT3G FAQ
1.How can I place an order for SZNUP2105LT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNUP2105LT3G 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 SZNUP2105LT3G reliable?
The price and inventory of SZNUP2105LT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNUP2105LT3G is usually 5 days.
3.What payment methods are accepted for SZNUP2105LT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNUP2105LT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNUP2105LT3G?
SZNUP2105LT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNUP2105LT3G 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 SZNUP2105LT3G?
For technical support, including SZNUP2105LT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNUP2105LT3G requirements.
6.How does Aetrix verify that SZNUP2105LT3G is sourced from the original manufacturer or authorized distributors?
All SZNUP2105LT3G 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 SZNUP2105LT3G meets industry standards.
7.What is the process for return or replacement of SZNUP2105LT3G?
All SZNUP2105LT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZNUP2105LT3G, 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 SZNUP2105LT3G part is unused and in its original packaging.
Return procedure for SZNUP2105LT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZNUP2105LT3G Tags
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