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onsemi P6SMB120AT3
- Part No.:
- P6SMB120AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB120AT3.pdf
- Description:
- TVS DIODE 102VWM 165VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,202
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Product details
Overview
P6SMB120AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 102 V working peak reverse voltage (VRWM), 120 V breakdown voltage (VBR) at 1 mA test current, 165 V maximum clamping voltage (VC) at 120 A peak pulse current (IPP), and <1 ns response time. It is used to protect automotive ECUs, industrial power supplies, and telecom interface circuits from ESD and lightning-induced surges.
For engineers reviewing the P6SMB120AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD, VRWM alignment with steady-state operating voltage, surge current capability under IEC 61000-4-5 waveforms, and UL 497B certification for isolated loop protection.
Technical Context
The P6SMB120AT3 operates as a Zener-based avalanche clamp, conducting only when reverse voltage exceeds its specified VBR of 120 V (min 114 V, max 126 V). Its low zener impedance and fast <1 ns response enable effective suppression of sub-microsecond transients without relying on external triggering circuitry.
It is rated for 600 W peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains <5 µA leakage above 10 V. Thermal derating begins at 75°C junction temperature, with RJL = 40 °C/W and RJA = 226 °C/W on FR-4 board using minimum recommended footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 102 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 114–126 V - Breakdown threshold range defining turn-on consistency across production lot |
| VC @ IPP=120 A | 165 V - Maximum clamped voltage during full-rated 10/1000 µs surge, limiting stress on downstream components |
| PPK | 600 W - Peak transient energy absorption capacity per non-repetitive 1 ms pulse |
| IR @ VRWM | 5 µA - Low leakage ensures minimal standby power loss and no false triggering |
| Response Time | <1 ns - Enables suppression of nanosecond-scale ESD events before system ICs are damaged |
| ESD Rating | Class 3 (>16 kV HBM) - Meets IEC 61000-4-2 Level 4 for robust board-level ESD immunity |
| UL Recognition | UL 497B QVGQ2 - Certified for use in isolated loop circuit protection per safety standard |
Pinout & Package
Package: SMB (Case 403A), surface-mount, unidirectional, cathode indicated by 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to ground or lower-potential rail; defines conduction path during overvoltage event |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V supply rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse rating | Supports IEC 61000-4-5 surge testing up to 4 kV (line-earth) without failure |
| 165 V clamping at 120 A | Provides ≥20% margin below typical 200 V MOSFET drain-source breakdown in 24 V systems |
| UL 497B recognition | Validates suitability for telecom/data line isolation barriers requiring certified protector classification |
| <1 ns response time | Minimizes overshoot in high-speed interfaces such as RS-485 or CAN FD bus lines |
| Pb-free SURMETIC® package | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level MSL 1 |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V DC Power Supply Input |
|---|---|
Use Scenario: Protecting microcontroller I/O pins and LIN bus transceivers from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, clamping spikes within 1 ns to prevent latch-up or gate oxide damage. Use Value: Maintains 102 V VRWM compatibility with 12 V nominal systems while surviving 120 A surges per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding switching regulator input stage against AC line surges and inductive kickback from relay coils. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V input rail, absorbing 600 W transient energy before upstream fuse opens. Use Value: Clamps to 165 V during 10/1000 µs surge, keeping downstream buck converter FETs below 200 V absolute maximum rating. |
| Telecom Remote Terminal Unit (RTU) | Medical Patient Monitor Signal Interface |
Use Scenario: Shielding RS-485 data lines in outdoor base stations exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional P6SMB120AT3 used on powered line (VCC side) with separate GND reference. Use Value: UL 497B certification confirms compliance for isolated loop protection in Class 2 circuits per NEC Article 725. | Use Scenario: Guarding analog front-end inputs (ECG, SpO₂) against ESD discharge from operator touch or cable coupling. IC Role / Device Role / Timing Role: Low-capacitance (<3.6 pF at 0 V bias) TVS placed directly at connector, minimizing signal distortion on high-impedance biopotential paths. Use Value: 16 kV HBM ESD rating meets IEC 61000-4-2 Level 4, ensuring patient safety and signal integrity during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Same SMB package, identical VRWM (102 V), VC = 165 V @ 120 A, but rated for 600 W per JEDEC standards instead of ON Semi's proprietary test | No UL 497B recognition; lacks isolated loop certification for telecom/data line use | Select when UL certification is not required and sourcing flexibility across multiple distributors is prioritized |
| 1.5SMC120A | Larger SMC package (7.1 × 6.2 mm vs. 4.6 × 3.95 mm), same electrical specs, higher thermal mass but requires more PCB area | Better sustained power handling in high-ambient environments (>85°C), but incompatible with dense layouts | Select when board space permits and long-duration surge immunity (e.g., motor drive back-EMF) outweighs size constraints |
Compared with SMBJ120A and 1.5SMC120A, the P6SMB120AT3 uniquely combines UL 497B certification, compact SMB footprint, and verified 600 W surge performance-making it optimal for space-constrained, safety-certified industrial and telecom designs where layout revision is costly.
Availability
P6SMB120AT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24 V power supplies, and medical signal interface circuits requiring stable component supply and long-term lifecycle support.
Supply support for P6SMB120AT3 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, sensor, and discrete devices for automotive, industrial, and communications markets.
The P6SMB120AT3 belongs to the P6SMBxxAT3 series of unidirectional TVS diodes engineered specifically for high-energy transient suppression in harsh environments-emphasizing reliability, UL certification, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of the P6SMB120AT3 at its rated peak pulse current?
The P6SMB120AT3 has a maximum clamping voltage (VC) of 165 V at 120 A peak pulse current (IPP), measured under the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain below critical voltage thresholds during surge events. The P6SMB120AT3 achieves this with low dynamic impedance and tight VBR distribution (114–126 V).
Is the P6SMB120AT3 RoHS-compliant and lead-free?
Yes, the P6SMB120AT3 is Pb-free and RoHS-compliant, as confirmed by the "G" suffix in its ordering code (P6SMB120AT3G). It meets JEDEC J-STD-020 moisture sensitivity level MSL 1 and is qualified for reflow soldering at 260°C for 10 seconds. The SURMETIC® package uses thermosetting plastic with corrosion-resistant, readily solderable leads-fully aligned with EU Directive 2011/65/EU requirements.
Does the P6SMB120AT3 have UL recognition, and for what standard?
Yes, the P6SMB120AT3 carries UL 497B recognition under file #E210057, category QVGQ2, specifically for isolated loop circuit protection. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing-going beyond basic flammability compliance. Unlike generic TVS diodes, the P6SMB120AT3 is approved for use in safety-critical telecom and industrial isolation barriers.
How does the P6SMB120AT3 compare to bidirectional TVS diodes like P6SMB120CAT3?
The P6SMB120AT3 is unidirectional and optimized for DC rail protection where polarity is fixed (e.g., 24 V supply to ground), offering tighter leakage (<5 µA) and lower capacitance (~3.6 pF) than its bidirectional counterpart P6SMB120CAT3. The latter supports AC or floating-line applications but exhibits higher leakage and capacitance. For most industrial power inputs, the P6SMB120AT3 delivers superior clamping precision and lower system noise impact.
What is the thermal resistance and derating behavior of the P6SMB120AT3?
The P6SMB120AT3 has a junction-to-lead thermal resistance (RJL) of 40 °C/W and junction-to-ambient (RJA) of 226 °C/W on FR-4 with ON Semi's minimum footprint. Its DC power dissipation derates linearly above 75°C at 25 mW/°C, and ambient-temperature derating begins at 25°C (0.55 W max at 25°C, decreasing 4.4 mW/°C). These values are validated per the datasheet's Figure 3 and ensure predictable thermal performance in enclosed enclosures.
P6SMB120AT3 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):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 165V
- Current - Peak Pulse (10/1000µs):
- 3.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 185pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB120AT3 FAQ
1.How can I place an order for P6SMB120AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB120AT3 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 P6SMB120AT3 reliable?
The price and inventory of P6SMB120AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB120AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB120AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB120AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB120AT3?
P6SMB120AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB120AT3 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 P6SMB120AT3?
For technical support, including P6SMB120AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB120AT3 requirements.
6.How does Aetrix verify that P6SMB120AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB120AT3 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 P6SMB120AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB120AT3?
All P6SMB120AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB120AT3, 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 P6SMB120AT3 part is unused and in its original packaging.
Return procedure for P6SMB120AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB120AT3 Tags
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ESD9B5.0ST5G
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