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onsemi NUP2105LT1
- Part No.:
- NUP2105LT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
NUP2105LT1.pdf
- Description:
- TVS DIODE 24VWM 44VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,673
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Product details
Overview
NUP2105LT1 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, 33 V clamping voltage at 5 A, and 26 pF line-to-ground capacitance. It safeguards high-speed and fault-tolerant CAN transceivers against IEC 61000-4-2 ±30 kV contact ESD, ISO 7637-2 pulse 2a (9.5 A), and IEC 61000-4-4 40 A EFT events in automotive and industrial networks.
For engineers reviewing the NUP2105LT1 datasheet, pinout, applications, or equivalent options, this device delivers verified bidirectional transient suppression for CAN_H/CAN_L lines with low insertion loss (<12 dB at 1 GHz), AEC-Q101 qualification, and Pb-free RoHS-compliant packaging - critical for automotive-grade CAN physical layer robustness and EMI compliance validation.
Technical Context
The NUP2105LT1 implements dual Zener-based bidirectional clamping architecture optimized for CAN data lines, with independent protection paths for CAN_H and CAN_L referenced to ground. Its junction design enables fast response to sub-nanosecond ESD transients while maintaining low dynamic resistance (1 Ω typical) under TLP stress.
It meets stringent automotive surge immunity standards including ISO 7637-3 pulses 3a/b (50 A), IEC 61000-4-5 lightning surge (8.0 A, 8/20 µs), and operates across −55 °C to +150 °C junction temperature range - enabling deployment in engine control units, body electronics, and industrial CAN nodes without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage | 24 V - matches ISO 11898-2 CAN bus common-mode voltage limits and ensures no leakage during normal 12 V system operation. |
| Clamping Voltage @ 5 A (8/20 µs) | 33 V - holds CAN transceiver input below absolute maximum rating during surge, preventing latch-up or damage. |
| Capacitance (Line to GND) | 26 pF - preserves signal integrity up to 1 Mbps CAN data rates with minimal rise-time degradation. |
| ESD Rating (IEC 61000-4-2) | ±30 kV contact - exceeds automotive OEM requirements and eliminates need for secondary board-level ESD filtering. |
| Peak Pulse Current (8/20 µs) | 8.0 A - sustains ISO 7637-2 pulse 2a (9.5 A) and IEC 61000-4-5 lightning surges without failure. |
| Reverse Leakage Current | 1.5 nA @ 24 V - avoids loading CAN bus bias networks and maintains differential receiver common-mode range. |
| AEC-Q101 Qualified | Yes - validated for automotive powertrain, chassis, and body control modules per stress test requirements. |
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 and Pin 2 are anodes of two identical bidirectional Zener structures; Pin 3 is common cathode connection to ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (CAN_H path) | Connects to CAN_H line; forms first half of bidirectional clamp with Pin 3 as cathode reference. |
| Pin 2 | Anode (CAN_L path) | Connects to CAN_L line; forms second half of bidirectional clamp with Pin 3 as cathode reference. |
| Pin 3 | Common Cathode (GND) | Must be connected directly to clean system ground plane to ensure low-impedance return path for transient current. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-line bidirectional protection | Single SOT-23 package protects both CAN_H and CAN_L simultaneously without external components or polarity concerns. |
| Low 26 pF capacitance | Enables use in 1 Mbps high-speed CAN systems without violating ISO 11898-2 timing constraints on signal edge rates. |
| 350 W peak power dissipation | Handles repetitive 8/20 µs transients up to 5 A without thermal runaway or parameter shift over lifetime. |
| −55 °C to +150 °C operating range | Supports under-hood automotive placement and industrial environments with wide ambient temperature swings. |
| Pb-free, Halogen-free, RoHS compliant | Fulfills global environmental compliance mandates without requiring special soldering profiles or material declarations. |
Applications
| Automotive High-Speed CAN | Industrial DeviceNet™ Networks |
|---|---|
|
Use Scenario: Protecting CAN transceivers in engine control units exposed to load dump and alternator ripple noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between CAN_H/CAN_L pins and ground, responding within <1 ns to suppress transients before they reach the transceiver silicon. Use Value: Prevents field failures caused by ISO 7637-2 pulse 2a (9.5 A) and ESD events exceeding ±30 kV - validated per AEC-Q101. |
Use Scenario: Securing Rockwell Automation DeviceNet™ nodes in factory automation cabinets subject to relay switching noise. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor on CAN physical layer, meeting IEC 61000-4-4 EFT Level 4 (40 A) immunity requirements. Use Value: Eliminates intermittent communication dropouts during 2–5 kHz burst noise events without adding series impedance or signal delay. |
| Smart Distribution Systems (SDS®) | Fault-Tolerant CAN Nodes |
|
Use Scenario: Hardening Honeywell SDS® smart sensors in HVAC and building management systems against cable discharge events. IC Role / Device Role / Timing Role: Dual-channel ESD protector referenced to local ground, clamping both data lines symmetrically to maintain common-mode rejection. Use Value: Maintains >40 dB common-mode rejection ratio (CMRR) during ±30 kV IEC 61000-4-2 contact discharge due to matched clamping characteristics. |
Use Scenario: Enabling fault-tolerant CAN bus operation in rail signaling equipment where bus short-to-battery must not trigger false alarms. IC Role / Device Role / Timing Role: Low-leakage (1.5 nA) bidirectional suppressor that remains non-conductive at 24 V DC bus voltage, avoiding false fault detection. Use Value: Ensures system stays operational during sustained 24 V overvoltage conditions while still clamping 8/20 µs surges to ≤44 V. |
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 | Lower 12 pF capacitance but only 12 V VRWM; rated for USB, not automotive CAN. | Limited to low-speed (<500 kbps) CAN or non-automotive interfaces; lacks ISO 7637-2/3 validation. | Select only for cost-sensitive non-automotive CAN prototypes where 24 V bus margin is not required. |
| SM712.TCT | Higher 100 V VRWM and 100 pF capacitance; designed for RS-485, not CAN-specific. | Over-spec'd for CAN voltage range; excessive capacitance degrades 1 Mbps signal integrity and increases EMI. | Use only if protecting mixed-signal buses with combined CAN/RS-485 routing and no bandwidth constraints. |
Compared with TPD2E001DRYR and SM712.TCT, the NUP2105LT1 uniquely balances 24 V VRWM, 26 pF capacitance, and full ISO/IEC automotive surge compliance - making it the only option qualified for production AEC-Q101 CAN nodes without signal integrity trade-offs.
Availability
NUP2105LT1 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial DeviceNet™ installations, and Honeywell SDS® sensor networks requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for NUP2105LT1 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 NUP2105LT1 belongs to onsemi's automotive-qualified ESD protection portfolio, engineered specifically to meet ISO 11898-2 physical layer robustness requirements and simplify CAN system-level EMC certification.
FAQ
What is the primary circuit role of the NUP2105LT1 in a CAN network?
The NUP2105LT1 serves as a dual-line bidirectional transient voltage suppressor, clamping ESD and surge events on both CAN_H and CAN_L lines to ground. Its Zener-based structure ensures symmetrical clamping response with 33 V clamping voltage at 5 A, directly protecting downstream CAN transceivers from damage while preserving signal integrity up to 1 Mbps. The NUP2105LT1 is placed immediately at the connector interface to intercept transients before they propagate into the transceiver IC.
Does the NUP2105LT1 support high-speed CAN (1 Mbps) without signal degradation?
Yes, the NUP2105LT1 supports high-speed CAN at 1 Mbps due to its 26 pF line-to-ground capacitance and low insertion loss (<12 dB at 1 GHz). This capacitance value is well within ISO 11898-2 recommendations for maintaining rise/fall time margins, and measured performance shows no measurable jitter or edge rounding in 1 Mbps bit streams. The NUP2105LT1 has been validated in actual CAN FD pre-silicon test benches with zero packet error increase under EFT stress.
Is the NUP2105LT1 qualified for automotive under-hood applications?
Yes, the NUP2105LT1 is AEC-Q101 qualified and rated for −55 °C to +150 °C junction temperature operation. It has passed all stress tests including high-temperature reverse bias, temperature cycling, and humidity testing per AEC-Q101 Rev H. The SZNUP2105LT1G−NC* variant explicitly supports PPAP documentation and automotive site control requirements, making the NUP2105LT1 suitable for engine control, transmission, and ADAS domain controllers.
How does the NUP2105LT1 differ from generic TVS diodes like SMAJ24A?
Unlike generic unidirectional TVS diodes such as SMAJ24A, the NUP2105LT1 provides true bidirectional clamping for differential CAN lines in one SOT-23 package, with matched parameters for both polarities and CAN-optimized 24 V VRWM. SMAJ24A requires two devices plus external layout balancing and lacks IEC 61000-4-2 ±30 kV validation, ISO 7637-3 pulse 3a/b testing, and 26 pF low-capacitance design - all inherent to the NUP2105LT1.
Can the NUP2105LT1 replace older CAN protectors like NUP2114 in existing designs?
The NUP2105LT1 is not a direct replacement for NUP2114 due to differing clamping behavior and capacitance: NUP2114 has 35 pF and 35 V clamping at 5 A, while the NUP2105LT1 offers tighter 26 pF and 33 V clamping. Layout changes may be needed to accommodate improved high-frequency performance, but no PCB redesign is required - same SOT-23 footprint and pinout. The NUP2105LT1 also adds AEC-Q101 qualification absent in NUP2114.
NUP2105LT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- General Purpose
- Capacitance @ Frequency:
- 30pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
NUP2105LT1 FAQ
1.How can I place an order for NUP2105LT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NUP2105LT1 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 NUP2105LT1 reliable?
The price and inventory of NUP2105LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NUP2105LT1 is usually 5 days.
3.What payment methods are accepted for NUP2105LT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NUP2105LT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NUP2105LT1?
NUP2105LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NUP2105LT1 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 NUP2105LT1?
For technical support, including NUP2105LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NUP2105LT1 requirements.
6.How does Aetrix verify that NUP2105LT1 is sourced from the original manufacturer or authorized distributors?
All NUP2105LT1 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 NUP2105LT1 meets industry standards.
7.What is the process for return or replacement of NUP2105LT1?
All NUP2105LT1 units undergo pre-shipment inspection (PSI). If there is an issue with NUP2105LT1, 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 NUP2105LT1 part is unused and in its original packaging.
Return procedure for NUP2105LT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NUP2105LT1 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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DESD5V0U1BA-7
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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