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onsemi SZMMBZ33VAWT1G
- Part No.:
- SZMMBZ33VAWT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
SZMMBZ33VAWT1G.pdf
- Description:
- TVS DIODE 26VWM 46VC SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:57,912
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Product details
Overview
SZMMBZ33VAWT1G from onsemi is a dual common-anode Zener diode array designed for bidirectional or unidirectional transient voltage suppression in signal line protection. It features a 33 V nominal Zener breakdown voltage (±5% tolerance), 40 W peak pulse power rating at 1.0 ms, and 26 V working peak reverse voltage, with <50 nA leakage at VRWM - deployed in ESD-sensitive interfaces of medical equipment and communication systems.
For engineers reviewing the SZMMBZ33VAWT1G datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage (46 V @ 0.87 A), thermal resistance (618 °C/W), AEC-Q101 qualification, SC-70 package footprint, and dual-line protection capability without board area penalty.
Technical Context
This device integrates two monolithic Zener junctions sharing a common anode (Pin 3), enabling either independent unidirectional clamping on Pins 1–3 and 2–3 or combined bidirectional operation across Pins 1–2. Its design targets fast-response surge suppression per IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) with Class 3B HBM ESD rating (>16 kV).
Thermal performance is constrained by FR-5 board mounting (200 mW steady-state dissipation, derated above 25°C), and junction temperature must remain within −55°C to +150°C. The 33 V nominal breakdown is specified at 1.0 mA test current, with ±0.087 %/°C temperature coefficient and 30.4 V minimum VBR at IT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VBR) | 31.35–34.65 V @ 1.0 mA - defines precise clamping threshold for overvoltage events |
| Clamping Voltage (VC) | 46 V @ 0.87 A peak pulse - actual voltage seen by protected circuit during 1.0 ms surge |
| Working Peak Reverse Voltage (VRWM) | 26 V - maximum continuous reverse bias before significant leakage or conduction |
| Peak Pulse Power (Ppk) | 40 W @ 1.0 ms - energy-handling capacity for transient surges per Figure 5 waveform |
| ESD Rating (HBM) | Class 3B (>16 kV) - meets stringent electrostatic discharge immunity for end-user handling |
| Leakage Current (IR) | <50 nA @ 26 V - ensures minimal signal loading and power loss in standby state |
| Junction Temp Range | −55°C to +150°C - supports automotive under-hood and industrial ambient conditions |
Pinout & Package
SC-70 (SOT-323) surface-mount package with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and Pb-free construction. Optimized for high-density automated assembly and 8 mm tape-and-reel delivery (3,000 units/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode 1 | First Zener junction cathode - connects to Line 1 for unidirectional clamping or forms one side of bidirectional path |
| Pin 2 | Cathode 2 | Second Zener junction cathode - connects to Line 2; enables dual-line protection in single footprint |
| Pin 3 | Anode (Common) | Shared anode node - ties both Zeners to ground or reference rail; determines common-mode suppression behavior |
Key Features
| Feature | Design Value |
|---|---|
| Dual Zener architecture | Two independent 33 V Zener junctions in one SC-70 package - reduces PCB real estate by 50% vs discrete solutions |
| Bidirectional configuration support | Pins 1 and 2 serve as symmetric terminals with shared anode (Pin 3) - enables differential or AC-coupled line protection |
| AEC-Q101 qualification | Validated for automotive applications including infotainment and body control modules - ensures reliability under thermal cycling and vibration |
| Low clamping ratio | VC/VBR = 46 V / 33 V ≈ 1.39 - minimizes overvoltage overshoot during fast transients compared to TVS diodes with higher ratios |
| High ESD robustness | Class 3B HBM (>16 kV) and Class C MM (>400 V) - exceeds IEC 61000-4-2 requirements for user-accessible ports |
Applications
| USB 2.0 Data Lines | Automotive CAN FD Transceivers |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 ports against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Dual-line transient voltage suppressor with common-anode grounding - clamps both data lines simultaneously to system ground. Use Value: Maintains signal integrity below 46 V clamping level while occupying only 2.1 × 1.25 mm² - critical for compact USB connectors. | Use Scenario: Safeguarding CAN_H and CAN_L bus lines in automotive ECUs exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional Zener clamp referenced to chassis ground - suppresses common-mode surges up to 40 W without polarity dependence. Use Value: AEC-Q101 qualification and −55°C to +150°C operation ensure compliance with automotive environmental stress testing. |
| Medical Sensor Interfaces | Industrial Ethernet PHY Ports |
Use Scenario: Shielding analog sensor inputs (e.g., ECG leads) from electrostatic discharge in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-leakage (<50 nA) dual Zener - prevents DC offset drift while providing fast transient response. Use Value: 30.4 V minimum breakdown ensures stable threshold across temperature; SC-70 allows placement directly at connector entry point. | Use Scenario: Protecting RJ45 magnetics interface on industrial Ethernet switches subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamping on each twisted pair (TX+/TX−, RX+/RX−) using separate cathode pins and shared ground. Use Value: 40 W peak power rating handles multi-pulse surge events per IEC 61000-4-5; UL 94 V-0 package meets fire-safety standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZMMBZ27VAWT1G | 27 V nominal Zener voltage, 40 V clamping @ 1.0 A, lower VC/VBR ratio (1.48) | Targeted at 24 V systems with tighter clamping margin; reduced voltage headroom for 33 V rails | Select when protecting 24 V CAN or RS-485 lines where lower clamping voltage is prioritized over 33 V compatibility |
| SZMMBZ39VAWT1G | 39 V nominal Zener voltage, 54 V clamping @ 0.74 A, higher VRWM (31 V) | Suitable for 36 V automotive subsystems or PoE-powered devices requiring higher standoff voltage | Choose for applications needing >30 V working voltage margin, such as 36 V battery-backed industrial controllers |
Compared with SZMMBZ27VAWT1G and SZMMBZ39VAWT1G, the SZMMBZ33VAWT1G provides optimal balance between 26 V VRWM headroom and 46 V clamping for 3.3 V–5 V logic interfaced with 33 V supply domains - making it the preferred choice for USB, CAN FD, and sensor front-end protection where 33 V nominal regulation is required.
Availability
SZMMBZ33VAWT1G is available at Aetrix Electronics and suitable for USB 2.0 port protection, automotive CAN FD bus safeguarding, and medical sensor interface hardening requiring stable component supply across production lifecycles.
Supply support for SZMMBZ33VAWT1G 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 delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ/SZMMBZxxVAWT1G series targets compact, high-reliability transient voltage suppression in space-constrained electronics - specifically engineered for dual-line ESD and surge protection without sacrificing thermal or electrical performance.
FAQ
What is the maximum clamping voltage of SZMMBZ33VAWT1G during a 1.0 ms transient event?
The SZMMBZ33VAWT1G exhibits a maximum clamping voltage (VC) of 46 V when subjected to its rated peak pulse current of 0.87 A under the 1.0 ms rectangular waveform defined in Figure 5 of the datasheet. This value represents the highest voltage imposed on the protected line during surge conduction and is measured at TA = 25°C with proper PCB layout and thermal management. The SZMMBZ33VAWT1G maintains this clamping performance across its qualified operating temperature range.
Is SZMMBZ33VAWT1G suitable for bidirectional signal line protection?
Yes, SZMMBZ33VAWT1G supports bidirectional protection by connecting Pins 1 and 2 to the differential signal pair (e.g., CAN_H/CAN_L or USB D+/D−) and tying Pin 3 (common anode) to ground. In this configuration, either cathode conducts during positive or negative transients, enabling symmetrical clamping. The device's dual-junction structure and matched Zener characteristics ensure balanced response - confirmed in the bidirectional mode curves of Figure 1 and Figure 3 in the official onsemi datasheet for SZMMBZ33VAWT1G.
Does SZMMBZ33VAWT1G meet automotive qualification standards?
Yes, the SZMMBZ33VAWT1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the onsemi datasheet. This certification validates its suitability for automotive applications including engine control units, body electronics, and infotainment systems. The "SZ" prefix denotes compliance with automotive-specific site and process controls, and the device undergoes stress testing for temperature cycling, mechanical shock, and humidity exposure per AEC-Q101 requirements - distinguishing it from the non-SZ MMBZ33VAWT1G variant.
What is the thermal resistance junction-to-ambient for SZMMBZ33VAWT1G on an FR-5 board?
The thermal resistance junction-to-ambient (RJA) for SZMMBZ33VAWT1G mounted on an FR-5 board is 618 °C/W, as specified in the Maximum Ratings table of the onsemi datasheet. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board). Engineers must apply this RJA to calculate junction temperature rise (ΔTJ = P × RJA) under steady-state or pulsed power conditions - especially critical when operating near the 200 mW total power dissipation limit at TA = 25°C. The SZMMBZ33VAWT1G's SC-70 package relies on copper pad area and thermal vias to approach this rated RJA.
How does the leakage current of SZMMBZ33VAWT1G compare to other Zener diodes in the series?
SZMMBZ33VAWT1G specifies a maximum reverse leakage current (IR) of 50 nA at its 26 V working peak reverse voltage (VRWM), matching the IR rating of all devices in the SZMMBZxxVAWT1G family (e.g., SZMMBZ27VAWT1G, SZMMBZ39VAWT1G). This uniform low-leakage performance ensures consistent signal integrity across voltage grades - critical for high-impedance sensor interfaces and battery-powered devices. The leakage remains well below 100 nA up to 85°C, as shown in Figure 2 of the onsemi datasheet for SZMMBZ33VAWT1G.
SZMMBZ33VAWT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 31.35V
- Voltage - Clamping (Max) @ Ipp:
- 46V
- Current - Peak Pulse (10/1000µs):
- 870mA
- Power - Peak Pulse:
- 40W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3 (SOT323)
SZMMBZ33VAWT1G FAQ
1.How can I place an order for SZMMBZ33VAWT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ33VAWT1G 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 SZMMBZ33VAWT1G reliable?
The price and inventory of SZMMBZ33VAWT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ33VAWT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ33VAWT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ33VAWT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ33VAWT1G?
SZMMBZ33VAWT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ33VAWT1G 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 SZMMBZ33VAWT1G?
For technical support, including SZMMBZ33VAWT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ33VAWT1G requirements.
6.How does Aetrix verify that SZMMBZ33VAWT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ33VAWT1G 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 SZMMBZ33VAWT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ33VAWT1G?
All SZMMBZ33VAWT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ33VAWT1G, 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 SZMMBZ33VAWT1G part is unused and in its original packaging.
Return procedure for SZMMBZ33VAWT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ33VAWT1G Tags
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D12V0L1B2LP-7B
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PESD2V0Y1BSFYL
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