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onsemi SZNUP3125WTT3G
- Part No.:
- SZNUP3125WTT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZNUP3125WTT3G.pdf
- Description:
- SZNUP3125WTT3G
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
SZNUP3125WTT3G from onsemi is a dual-line bidirectional TVS diode array designed specifically for CAN bus protection in 24 V automotive and industrial networks. It delivers 120 W peak power dissipation per line (8/20 µs), clamps transients to ≤55 V at 2 A, and features matched diode capacitance (≤2%) and <100 nA reverse leakage at 32 V. It is used in high-speed and fault-tolerant CAN transceiver interfaces to meet IEC 61000-4-2 Level 4 ESD, IEC 61000-4-4 EFT (50 A), and IEC 61000-4-5 lightning surge standards.
For engineers reviewing the SZNUP3125WTT3G datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (SC-70/SOT-323), validated terminal roles, confirmed IEC compliance levels, real-world clamping behavior at 1–2 A IPP, and AEC-Q101-qualified alternatives for CAN-FD and fault-tolerant CAN designs.
Technical Context
The SZNUP3125WTT3G integrates two identical bidirectional Zener TVS diodes in a single SC-70 package, enabling symmetrical transient suppression on both CAN_H and CAN_L lines. Its breakdown voltage (35.6–39 V) ensures reliable conduction above normal CAN common-mode swing while maintaining low leakage (<100 nA) at 32 V VRWM.
Clamping is achieved via avalanche breakdown under surge conditions, with VC = 47–60 V across 1–2 A peak pulse current (8/20 µs). Diode capacitance is tightly matched (≤2% difference between lines) and rated at 4.5–6.0 pF at 5 V bias and 1 MHz - critical for preserving signal integrity in high-speed CAN-FD (up to 5 Mbps) and fault-tolerant CAN systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Power Dissipation | 120 W per line (8/20 µs); sustains high-energy surges without failure in automotive load-dump or EFT events |
| Reverse Working Voltage (VRWM) | 32 V; safely operates up to nominal 24 V system rail with margin against DC overvoltage |
| Breakdown Voltage (VBR) | 35.6–39 V at 1 mA; triggers clamping before CAN transceiver damage threshold (~40 V) |
| Clamping Voltage (VC) | 47–60 V at 1–2 A IPP; limits transient voltage seen by transceiver I/O pins during IEC 61000-4-5 surges |
| Diode Capacitance Matching | ≤2% difference between CAN_H/CAN_L paths; preserves differential timing and minimizes skew in high-speed CAN |
| IEC 61000-4-2 ESD | ±21 kV contact/air discharge; exceeds Level 4 requirement for robustness in assembly and field handling |
| Operating Junction Temp | −55 °C to +150 °C; supports under-hood automotive placement and industrial control cabinet environments |
Pinout & Package
Package: SC-70 (SOT-323), 3-pin surface-mount, Pb-free, RoHS-compliant, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (CAN_H line) | Connected to CAN_H signal path; forms one half of bidirectional clamp to GND |
| Pin 2 | Anode (common ground reference) | Shared cathode-anode node tied to system GND; enables symmetric dual-line protection |
| Pin 3 | Cathode (CAN_L line) | Connected to CAN_L signal path; completes second bidirectional clamp leg |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Transient Suppression | Protects both positive and negative polarity surges on CAN_H and CAN_L without polarity constraints |
| Tight Capacitance Matching | ≤2% inter-line capacitance variation preserves differential signal fidelity in CAN-FD (5 Mbps) and HS-CAN |
| AEC-Q101 Qualified | Validated for automotive use including temperature cycling, HTRB, and ESD stress per AEC standard |
| Low Leakage Current | <100 nA at 32 V ensures minimal impact on CAN bus biasing and quiescent power draw |
| Compact Dual-Line Integration | Single SC-70 package replaces discrete dual-diode solutions, reducing PCB area and BOM count |
Applications
| Automotive High-Speed CAN | Industrial DeviceNet Networks |
|---|---|
Use Scenario: In-vehicle ADAS domain controllers communicating over 1 Mbps+ CAN-FD backbone. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed directly at CAN transceiver I/O pins to limit ESD/EFT-induced latch-up. Use Value: Enables reliable operation under ISO 10605 ESD (±30 kV) and ISO 7637-2 load dump, preserving bit error rate <10⁻¹². | Use Scenario: Factory automation PLCs interfacing with DeviceNet sensors using 500 kbps physical layer. IC Role / Device Role / Timing Role: Surge protector on DeviceNet trunk lines exposed to motor drive switching noise and ground potential differences. Use Value: Clamps 2 A IEC 61000-4-5 surges to ≤55 V, preventing transceiver reset and communication dropout during EMI-heavy operation. |
| Truck & Bus Fault-Tolerant CAN | Smart Distribution Systems (SDS) |
Use Scenario: Heavy-duty vehicle chassis networks operating at 125 kbps with ±35 V common-mode tolerance. IC Role / Device Role / Timing Role: Dual-line protector ensuring continued bus operation during line-to-ground shorts or battery reversal events. Use Value: Maintains CAN_L/CAN_H symmetry under fault conditions due to matched clamping and low capacitance skew. | Use Scenario: Energy management gateways monitoring circuit breakers and relays in smart grid substations. IC Role / Device Role / Timing Role: EMI filter and surge limiter on SDS control bus connecting distributed I/O modules over long cable runs. Use Value: Meets IEC 61000-4-4 (50 A EFT) and IEC 61000-4-5 (2 A lightning) requirements for Class A industrial immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CAN bus protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPD2E001DRYR | Single-channel, 1.5 pF typical capacitance, lower 30 W peak power, no AEC-Q101 qualification | Targeted at low-speed, non-automotive USB/I²C; insufficient for CAN-FD or 24 V truck systems | Select only for cost-sensitive consumer-grade CAN nodes where 120 W surge rating is not required |
| SM712.TCT | Dual-line, 100 W peak power, higher 12 pF capacitance, no diode matching spec, AEC-Q101 not claimed | Used in legacy industrial CAN; higher capacitance may degrade >1 Mbps signal integrity | Acceptable for low-speed (≤500 kbps) CAN where timing skew is less critical than cost |
Compared with TPD2E001DRYR and SM712.TCT, the SZNUP3125WTT3G uniquely combines AEC-Q101 qualification, ≤2% capacitance matching, and 120 W per-line surge capability - making it the only option qualified for automotive CAN-FD and fault-tolerant CAN in harsh 24 V environments.
Availability
SZNUP3125WTT3G is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and smart grid gateways requiring stable component supply, AEC-Q101 compliance, and IEC 61000-4-2/4-4/4-5 certified surge protection.
Supply support for SZNUP3125WTT3G 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NUP3125/SZNUP3125 product line was engineered specifically for CAN bus interface protection - balancing low capacitance, tight matching, high surge robustness, and automotive qualification in ultra-compact SC-70 packaging.
FAQ
What is the primary function of the SZNUP3125WTT3G in a CAN network?
The SZNUP3125WTT3G serves as a dual-line bidirectional transient voltage suppressor protecting CAN_H and CAN_L signal lines from ESD, EFT, and lightning surges. It clamps transients to safe levels (≤60 V) while maintaining low capacitance and matched performance between lines - ensuring signal integrity and transceiver reliability in automotive and industrial CAN networks. The SZNUP3125WTT3G is explicitly designed for 24 V CAN systems and meets IEC 61000-4-2 Level 4, IEC 61000-4-4, and IEC 61000-4-5 standards.
Is the SZNUP3125WTT3G qualified for automotive applications?
Yes, the SZNUP3125WTT3G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-grade manufacturing controls and site-specific change management. It operates across −55 °C to +150 °C junction temperature and is validated for automotive under-hood environments, including thermal cycling, humidity testing, and mechanical shock. The SZNUP3125WTT3G is specified for use in trucks, fault-tolerant CAN, and high-speed CAN-FD systems per its official onsemi documentation.
What is the package type and pin configuration of the SZNUP3125WTT3G?
The SZNUP3125WTT3G uses the SC-70 (SOT-323) package with three terminals: Pin 1 is the cathode for CAN_H, Pin 2 is the common anode tied to GND, and Pin 3 is the cathode for CAN_L. This configuration enables symmetrical bidirectional clamping on both data lines within a 2.2 mm × 2.2 mm footprint. The SZNUP3125WTT3G marking includes "42M" per the datasheet, and the device is Pb-free, halogen-free, and RoHS compliant.
How does the SZNUP3125WTT3G compare to standard Zener diodes in CAN protection?
Unlike standard Zener diodes, the SZNUP3125WTT3G features a junction optimized for high peak energy absorption (120 W, 8/20 µs), low leakage (<100 nA), and matched capacitance (≤2%) between CAN_H and CAN_L paths. Standard Zeners lack surge-rated construction and exhibit higher capacitance variation, risking CAN signal distortion. The SZNUP3125WTT3G is purpose-built for CAN transceiver I/O protection - its clamping behavior, thermal derating curve, and IEC test compliance are all validated per automotive and industrial surge standards.
What are the key electrical parameters that define the SZNUP3125WTT3G's surge protection capability?
Key parameters include: VRWM = 32 V (ensures no conduction during normal 24 V operation), VBR = 35.6–39 V (guarantees reliable turn-on before transceiver damage), VC = 47–60 V at 1–2 A IPP (defines maximum voltage imposed on the transceiver during surge), and peak power = 120 W per line. These values - confirmed in the onsemi NUP3125/D datasheet - ensure the SZNUP3125WTT3G meets IEC 61000-4-5 (2 A, 8/20 µs) and ISO 16750-2 load-dump immunity requirements for 24 V systems.
SZNUP3125WTT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- 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:
- 60V
- Current - Peak Pulse (10/1000µs):
- 2A (8/20µs)
- Power - Peak Pulse:
- 120W
- Power Line Protection:
- No
- Applications:
- CAN
- Capacitance @ Frequency:
- 5.7pF @ 1MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
SZNUP3125WTT3G FAQ
1.How can I place an order for SZNUP3125WTT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZNUP3125WTT3G 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 SZNUP3125WTT3G reliable?
The price and inventory of SZNUP3125WTT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZNUP3125WTT3G is usually 5 days.
3.What payment methods are accepted for SZNUP3125WTT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZNUP3125WTT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZNUP3125WTT3G?
SZNUP3125WTT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZNUP3125WTT3G 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 SZNUP3125WTT3G?
For technical support, including SZNUP3125WTT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZNUP3125WTT3G requirements.
6.How does Aetrix verify that SZNUP3125WTT3G is sourced from the original manufacturer or authorized distributors?
All SZNUP3125WTT3G 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 SZNUP3125WTT3G meets industry standards.
7.What is the process for return or replacement of SZNUP3125WTT3G?
All SZNUP3125WTT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZNUP3125WTT3G, 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 SZNUP3125WTT3G part is unused and in its original packaging.
Return procedure for SZNUP3125WTT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZNUP3125WTT3G 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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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
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Diodes Incorporated
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