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onsemi P6SMB18AT3
- Part No.:
- P6SMB18AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18AT3.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,466
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Product details
Overview
P6SMB18AT3 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 15.3 V working peak reverse voltage (VRWM), 18 V breakdown voltage (VBR) at 1 mA test current, clamps to ≤25.2 V at 24 A peak pulse current, and responds in <1 ns - deployed in automotive ECUs, industrial power supplies, and telecom interface circuits.
For engineers reviewing the P6SMB18AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin above operating voltage, clamping voltage vs. protected IC's absolute maximum rating, surge current capability under IEC 61000-4-5 waveforms, and UL 497B recognition for isolated loop protection.
Technical Context
The P6SMB18AT3 operates as a Zener-based avalanche clamp, conducting only when reverse voltage exceeds its specified VBR (17.1–18.9 V). Its low zener impedance and fast <1 ns response enable effective suppression of ESD (≥16 kV HBM) and lightning-induced transients without forward conduction during normal operation.
It is rated for 600 W non-repetitive peak pulse power (10/1000 µs waveform), with thermal derating starting at 75°C junction temperature. The device uses a thermoset plastic SURMETIC® SMB package (Case 403A) with modified L-bend leads and cathode polarity band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15.3 V - Maximum continuous reverse operating voltage before significant leakage; must exceed circuit's max DC/peak AC voltage. |
| VBR @ IT=1 mA | 17.1–18.9 V - Breakdown onset range; defines threshold where clamping begins under standardized test conditions. |
| VC @ IPP=24 A | ≤25.2 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream components. |
| IPP | 24 A - Peak pulse current supported at rated clamping voltage; correlates to IEC 61000-4-5 Level 4 immunity (4 kV line-to-ground). |
| IR @ VRWM | ≤5 µA - Reverse leakage at working voltage; ensures minimal power loss and no false triggering in standby. |
| Response Time | <1 ns - Time from transient onset to conduction; critical for protecting high-speed interfaces against sub-microsecond spikes. |
| ESD Rating | >16 kV HBM - Human Body Model robustness; qualifies for direct port-level ESD protection per IEC 61000-4-2. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates performance in telecom and industrial safety-critical systems. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with cathode polarity band. Dimensions: 4.06–4.60 mm width (E), 3.30–3.95 mm length (D), 1.90–2.45 mm height (A), 0.76–1.60 mm lead length (L).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-biased operation | Connected to system ground or lower-potential rail; forms return path during transient conduction. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); polarity band identifies this terminal for correct PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W Peak Pulse Power | Supports high-energy surges per IEC 61000-4-5 without degradation; enables single-device protection for 24 V industrial buses. |
| UL 497B Recognition | Validated for isolated loop protection in telecom and process control; eliminates need for additional certification testing. |
| Low Clamping Ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected ICs - e.g., clamps 12 V supply to ≤25.2 V while maintaining 17.1 V nominal breakdown. |
| ≤5 µA Leakage @ VRWM | Prevents measurable current draw in always-on systems; avoids battery drain in automotive standby modes. |
| Pb-Free (G suffix) | Complies with RoHS Directive 2011/65/EU; compatible with standard SnPb and lead-free reflow profiles up to 260°C for 10 s. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V PLC Input Card |
|---|---|
Use Scenario: Protecting CAN transceiver power pins against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V rail and ground to clamp surges >35 V. Use Value: Limits voltage to ≤25.2 V during 24 A surge, preventing damage to TJA1042-level transceivers rated for 36 V abs max. | Use Scenario: Safeguarding optocoupler input circuitry on digital input modules exposed to field wiring faults. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor across 24 V DC input terminals. Use Value: Absorbs 600 W surges from inductive kickback or accidental 48 V miswiring while maintaining <5 µA leakage during normal operation. |
| Telecom DSL Line Interface | Medical Infusion Pump Power Supply |
Use Scenario: Shielding ADSL line driver ICs from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional P6SMB18AT3 used on DC bias rail feeding line driver. Use Value: UL 497B recognition confirms suitability for telecom isolation barrier compliance; clamping <1 ns prevents data corruption during burst noise events. | Use Scenario: Securing 15 V logic supply feeding microcontroller and motor drivers against ESD and switching noise. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output, placed immediately before MCU VDD pin. Use Value: 15.3 V VRWM matches 15 V rail with 2% margin; ≤25.2 V VC ensures MCU (rated 30 V abs max) remains within safe operating area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Same SMB package, identical VRWM (15.3 V), VBR (17.1–18.9 V), and VC (≤25.2 V), but rated for 600 W per JEDEC standards (vs. ON Semi's proprietary test). | No functional difference in circuit protection; validated for same IEC 61000-4-5 waveforms and UL 497B scope. | Select SMBJ18A if dual-sourcing from multiple manufacturers is required; identical electrical behavior and footprint. |
| 1.5SMC18A | Larger SMC package (7.1 × 6.2 mm vs. SMB's 4.6 × 3.95 mm); same 15.3 V VRWM and 25.2 V VC, but higher 1500 W peak power rating. | Occupies more PCB area; suited for higher-energy environments (e.g., outdoor power converters) where 600 W margin is insufficient. | Choose 1.5SMC18A only when surge energy exceeds P6SMB18AT3's 600 W rating - otherwise, SMB footprint saves space and cost. |
Compared with SMBJ18A, P6SMB18AT3 offers identical protection specs in the same compact SMB package but with ON Semiconductor's UL 497B certification for isolated loops; versus 1.5SMC18A, it trades surge headroom for 40% smaller board area and lower thermal mass in space-constrained designs.
Availability
P6SMB18AT3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical device power supplies requiring stable component supply and long-term lifecycle support.
Supply support for P6SMB18AT3 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 P6SMB18AT3 belongs to ON Semiconductor's P6SMBxxAT3 series of 600 W unidirectional TVS diodes, engineered for robust overvoltage protection in cost-sensitive, high-volume applications where UL recognition and tight clamping performance are mandatory.
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB18AT3?
The P6SMB18AT3 has a working peak reverse voltage (VRWM) of 15.3 V, meaning it remains non-conductive up to this DC or peak AC voltage level. This value provides a 15% margin above its 18 V nominal breakdown voltage and ensures reliable blocking during normal operation of 12–15 V systems. Exceeding VRWM risks premature leakage or thermal runaway.
How does the P6SMB18AT3 compare to bidirectional TVS diodes like P6SMB18CAT3?
The P6SMB18AT3 is unidirectional and conducts only in reverse bias, making it ideal for DC rail protection where polarity is fixed. In contrast, P6SMB18CAT3 is bidirectional and protects both polarities - suitable for AC lines or differential signals. Using P6SMB18AT3 on an AC path would leave positive transients unprotected, so selection must match circuit topology and voltage polarity requirements.
Is the P6SMB18AT3 RoHS-compliant and lead-free?
Yes, the "G" suffix in P6SMB18AT3 indicates a Pb-free (RoHS-compliant) package. It meets EU Directive 2011/65/EU and is qualified for reflow soldering at 260°C for 10 seconds. The device uses matte tin-plated leads and halogen-free molding compound, with full material declarations available via ON Semiconductor's compliance portal.
What is the maximum clamping voltage (VC) of the P6SMB18AT3 under surge conditions?
The P6SMB18AT3 clamps to a maximum of 25.2 V when subjected to its rated 24 A peak pulse current (10/1000 µs waveform). This VC value is critical for ensuring protected components - such as 30 V-rated microcontrollers or CAN transceivers - remain within their absolute maximum voltage ratings during transient events.
Does the P6SMB18AT3 require a heatsink in typical applications?
No, the P6SMB18AT3 does not require an external heatsink in standard applications because it handles only non-repetitive transients (e.g., ESD or lightning surges), not continuous power dissipation. Its thermal resistance (RJA = 226°C/W) is sufficient for short-duration pulses; however, PCB copper area per ON Semiconductor's recommended footprint (Case 403A) must be maintained to ensure proper junction temperature control during repeated surges.
P6SMB18AT3 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 1000pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB18AT3 FAQ
1.How can I place an order for P6SMB18AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18AT3 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 P6SMB18AT3 reliable?
The price and inventory of P6SMB18AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB18AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18AT3?
P6SMB18AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18AT3 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 P6SMB18AT3?
For technical support, including P6SMB18AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18AT3 requirements.
6.How does Aetrix verify that P6SMB18AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB18AT3 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 P6SMB18AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB18AT3?
All P6SMB18AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18AT3, 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 P6SMB18AT3 part is unused and in its original packaging.
Return procedure for P6SMB18AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB18AT3 Tags
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