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onsemi P6SMB33AT3
- Part No.:
- P6SMB33AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB33AT3.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,965
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Product details
Overview
P6SMB33AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 28.2 V working peak reverse voltage (VRWM), 33 V nominal Zener breakdown voltage (VBR) at 1 mA test current, clamps to ≤45.7 V at 13.2 A peak pulse current (IPP), and responds in <1 ns - making it suitable for protecting automotive power supplies, industrial I/O interfaces, and telecom surge-sensitive front-ends.
For engineers reviewing the P6SMB33AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin above operating voltage, clamping voltage vs. protected device's absolute maximum rating, peak pulse current capability under 10/1000 µs waveform, and UL 497B recognition for isolated loop circuit protection.
Technical Context
The P6SMB33AT3 operates as a silicon avalanche diode with sharp Zener breakdown characteristics, optimized for fast transient suppression in unidirectional configurations. Its low zener impedance and sub-nanosecond response enable effective clamping of ESD (Class 3 >16 kV HBM) and lightning-induced surges without significant overshoot when mounted with minimal trace inductance.
Thermal design relies on junction-to-lead resistance of 40 °C/W and 3.0 W DC power dissipation at 75 °C lead temperature. The device uses a thermoset plastic SURMETIC® package (Case 403A) with modified L-bend leads and cathode polarity band - enabling robust reflow soldering up to 260 °C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28.2 V - maximum continuous reverse voltage before leakage exceeds 5 µA; must be ≥ system operating voltage to avoid conduction during normal operation |
| VBR @ IT = 1 mA | 33.05 V (min) to 34.7 V (max) - precise Zener breakdown threshold defining turn-on onset under transient stress |
| VC @ IPP = 13.2 A | ≤45.7 V - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs |
| PPK | 600 W - peak pulse power handling per non-repetitive 1 ms surge; defines single-event energy absorption capacity |
| IR @ VRWM | ≤5 µA - reverse leakage at rated working voltage; ensures negligible standby power loss in high-impedance circuits |
| Response Time | <1 ns - time from transient onset to clamping action; critical for protecting nanosecond-scale logic and analog inputs |
| UL Recognition | UL 497B QVGQ2 - certified for isolated loop circuit protection, including strike voltage, endurance, and dielectric withstand testing |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with cathode polarity band. Dimensions: 4.06–4.60 mm (E), 3.30–3.95 mm (D), 1.90–2.45 mm (A), 0.76–1.60 mm (L). Lead finish is Pb-free (G suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamp | Connected to lower-potential side (e.g., GND or return path); forms low-impedance shunt to ground during overvoltage |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., +12 V rail); conducts avalanche current when line voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure, supporting automotive and industrial environments |
| UL 497B certification | Validated for safety-critical isolated loop protection in medical and telecom systems requiring third-party surge compliance |
| ESD Class 3 (>16 kV HBM) | Withstands human-body-model electrostatic discharge events common in handling and field deployment |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected components - e.g., 33 V-rated ICs survive 45.7 V clamp with margin |
| Sub-1 ns response time | Engages before most microcontroller I/O or analog front-end stages can be damaged by fast-rising transients |
Applications
| Automotive Power Rail Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Suppressing load dump and alternator ripple transients on 24 V vehicle battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to shunt surge current away from PMICs and CAN transceivers. Use Value: Clamps 13.2 A surge to ≤45.7 V within <1 ns, preventing latch-up or gate oxide damage in 36 V-tolerant power management ICs. |
Use Scenario: Protecting PLC digital input modules from induced surges on 24 V dry-contact sensor lines. IC Role / Device Role / Timing Role: Parallel-connected TVS at terminal block entry point, referenced to module ground plane. Use Value: Limits transient voltage to safe levels for optocoupler input stages and microcontroller GPIOs rated ≤50 V absolute max. |
| Telecom Line Interface Protection | Medical Equipment Isolated Supply Protection |
Use Scenario: Guarding RS-485 transceiver bus lines against lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional P6SMB33AT3 used on VCC-side of termination network. Use Value: Provides UL 497B-compliant isolation barrier protection while maintaining signal integrity via low capacitance (≈585 pF at 0 V). |
Use Scenario: Safeguarding secondary-side DC/DC converter outputs in patient-connected diagnostic devices. IC Role / Device Role / Timing Role: Final-stage TVS on isolated 5 V or 12 V supply rail feeding analog front-end ADCs and sensors. Use Value: Meets IEC 60601-1 creepage/clearance requirements via SURMETIC® package and supports UL 497B-certified loop isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Same SMB package, identical VRWM (28.2 V) and VC (45.7 V), but higher IPP (13.3 A vs. 13.2 A); slightly tighter VBR tolerance (33.05–34.7 V vs. 33–34.7 V) | No functional difference in clamping performance; validated for same automotive and industrial surge standards | Select SMBJ33A if sourcing from alternate distributors with tighter inventory coverage; electrical behavior is interchangeable in existing layouts |
| 1.5SMC33A | Larger SMC package (7.1 × 6.2 mm vs. 4.6 × 3.95 mm); same VRWM and VC, but higher PPK (1500 W) and IPP (33.1 A) | Requires PCB footprint change; suited for higher-energy threat environments where 600 W is marginal | Choose 1.5SMC33A only when system-level testing shows P6SMB33AT3 approaches thermal limits under repetitive surge conditions |
Compared with SMBJ33A and 1.5SMC33A, the P6SMB33AT3 offers optimal space efficiency in SMB footprint while delivering verified 600 W surge immunity and UL 497B certification - making it preferred for cost- and size-constrained designs where full 1500 W rating is unnecessary.
Availability
P6SMB33AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for P6SMB33AT3 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud power applications.
The P6SMB33AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered for high-reliability surge protection in harsh environments - emphasizing low clamping voltage, fast response, and regulatory compliance (UL 497B, AEC-Q200 readiness).
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB33AT3?
The P6SMB33AT3 has a working peak reverse voltage (VRWM) of 28.2 V. This value represents the maximum continuous DC or peak AC voltage the device can block in normal operation while maintaining reverse leakage ≤5 µA. Engineers must ensure system operating voltage remains below this threshold to prevent unintended conduction - for example, it is appropriate for 24 V automotive or industrial rails with sufficient margin.
How does the clamping voltage VC of the P6SMB33AT3 compare to its breakdown voltage VBR?
The P6SMB33AT3 clamps to ≤45.7 V at 13.2 A peak pulse current (IPP), while its nominal breakdown voltage VBR is 33 V at 1 mA test current. This yields a clamping ratio (VC/VBR) of approximately 1.39, indicating tight voltage control during surge events. That ratio ensures protected ICs with 48 V absolute maximum ratings remain within safe operating limits during standardized 10/1000 µs transients.
Is the P6SMB33AT3 certified for safety-critical applications like medical or telecom equipment?
Yes, the P6SMB33AT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. It passed rigorous tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation - making it suitable for medical equipment secondary-side power rails and telecom interface protection where regulatory compliance is mandatory.
What is the thermal resistance and power derating behavior of the P6SMB33AT3?
The P6SMB33AT3 has a junction-to-lead thermal resistance (RJL) of 40 °C/W and provides 3.0 W DC power dissipation at 75 °C lead temperature, derating linearly above that point. At ambient temperatures above 25 °C, its junction-to-ambient resistance (RJA) is 226 °C/W, limiting DC dissipation to 0.55 W - meaning it is intended primarily for transient, not continuous, power handling.
Can the P6SMB33AT3 replace bidirectional TVS diodes in circuit designs?
No - the P6SMB33AT3 is strictly unidirectional and lacks symmetrical clamping for AC or bipolar transients. For bidirectional protection, ON Semiconductor specifies separate parts such as P6SMB33CAT3. Substituting P6SMB33AT3 in place of a bidirectional device risks failure during negative-going surges, as it will conduct freely in forward bias but offer no reverse clamping beyond its VRWM limit.
P6SMB33AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 13.2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 585pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB33AT3 FAQ
1.How can I place an order for P6SMB33AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB33AT3 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 P6SMB33AT3 reliable?
The price and inventory of P6SMB33AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB33AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB33AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB33AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB33AT3?
P6SMB33AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB33AT3 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 P6SMB33AT3?
For technical support, including P6SMB33AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB33AT3 requirements.
6.How does Aetrix verify that P6SMB33AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB33AT3 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 P6SMB33AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB33AT3?
All P6SMB33AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB33AT3, 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 P6SMB33AT3 part is unused and in its original packaging.
Return procedure for P6SMB33AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB33AT3 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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