My Inquiry
My Account
onsemi P6SMB20AT3
- Part No.:
- P6SMB20AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
P6SMB20AT3.pdf
- Description:
- TVS ZENER UNIDIR 600W 20V SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P6SMB20AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power lines and signal paths. It features a 17.1 V working peak reverse voltage (VRWM), 20 V breakdown voltage (VBR) at 1 mA test current, and clamps transients to 27.7 V at 22 A peak pulse current (IPP), making it suitable for automotive power rail surge suppression and industrial I/O port protection.
For engineers reviewing the P6SMB20AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current handling under ISO 7637-2/IEC 61000-4-5 waveforms, thermal derating above 75°C, and UL 497B recognition for isolated loop circuit protection.
Technical Context
This device operates as a Zener-based avalanche clamp in reverse-biased mode, with fast response time (<1 ns) enabling suppression of nanosecond-scale ESD and lightning-induced surges. Its low zener impedance ensures stable clamping across varying surge currents, while the thermally robust SURMETIC® SMB package supports 600 W non-repetitive pulse dissipation at 1 ms.
The P6SMB20AT3 is rated for −65°C to +150°C operating temperature and complies with AEC−Q101 for automotive use. It delivers Class 3 ESD immunity (>16 kV HBM) and meets UL 497B requirements for isolated loop circuit protection, confirming suitability for safety-critical telecom and medical equipment interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 17.1 V - Maximum continuous reverse voltage before significant leakage; must exceed system DC operating voltage to avoid false triggering. |
| VBR @ IT = 1 mA | 20 V (min) to 21 V (max) - Zener breakdown threshold defining turn-on precision; tight 5% tolerance enables predictable protection onset. |
| VC @ IPP = 22 A | 27.7 V - Clamped voltage during 8.3 ms surge; determines maximum stress on downstream components during transient events. |
| PPK | 600 W @ 1 ms - Peak surge power handling capability; defines survivability against IEC 61000-4-5 combination wave (1.2/50 μs voltage, 8/20 μs current). |
| IR @ VRWM | 5 μA max - Reverse leakage current at working voltage; ensures minimal standby power loss and no interference with high-impedance sensing circuits. |
| Response Time | <1 ns - Time from transient onset to clamping activation; critical for protecting fast logic and analog front-ends from ESD overshoot. |
| UL Recognition | UL 497B QVGQ2 - Certified for isolated loop circuit protection; validates performance in telecom line interface and PoE-powered equipment. |
Pinout & Package
Package: SMB (Case 403A), surface-mount, void-free thermosetting plastic with modified L-bend leads and cathode polarity band. Dimensions: 4.06–4.60 mm (E), 3.30–3.95 mm (D), 1.95–2.47 mm (A), 0.76–1.60 mm (L). RoHS-compliant, Pb-free, solderable at 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; establishes reference for reverse-bias operation during surge events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current to anode when voltage exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables single-device protection against severe transients per IEC 61000-4-5 Level 4 (4 kV/2 kA) without external series impedance. |
| UL 497B recognition | Validates compliance for use in telecom line interface circuits requiring certified isolation barrier protection. |
| AEC−Q101 qualification | Confirms reliability for automotive applications including body control modules and infotainment power inputs. |
| ESD rating >16 kV HBM | Provides robustness against human-body-model ESD events common in manufacturing and field service environments. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected ICs by limiting clamped voltage to just 39% above breakdown threshold. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Suppressing load dump and jump-start surges on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp transients exceeding 17.1 V. Use Value: Limits peak voltage to 27.7 V during 22 A surges, preventing damage to CAN transceivers and microcontrollers rated for 30 V absolute maximum. |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel to shunt induced spikes before reaching optocoupler input stages. Use Value: Sub-1 ns response ensures clamping occurs before 24 V logic thresholds are exceeded, maintaining signal integrity during relay coil de-energization. |
| Telecom Line Interface Protection | Medical Equipment Power Input Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins and RS-485 transceiver VCC rails in network edge devices. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on isolated DC-DC converter outputs feeding communication ICs. Use Value: Meets telecom safety standards for isolated loop circuits while clamping fast-rising EFT bursts to below 28 V. |
Use Scenario: Shielding auxiliary 5 V/12 V power inputs in diagnostic imaging equipment from mains-coupled surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side power distribution networks upstream of LDO regulators. Use Value: 600 W surge rating handles high-energy transients from hospital-grade power systems without degradation over 100,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same VRWM (17.1 V) and VC (27.7 V), but lower PPK (400 W) and higher IR (10 μA max). | Limited to less severe surge environments (IEC 61000-4-5 Level 2); not UL 497B recognized. | Select when cost sensitivity outweighs need for UL certification and 600 W headroom. |
| 1.5SMC20A | Identical electrical specs but larger SMC package (7.1 × 6.2 mm vs. SMB 4.6 × 3.95 mm); 1500 W PPK rating. | Requires PCB layout change; suited for high-reliability industrial systems needing extended surge margin. | Choose only if board space allows SMC footprint and system requires >600 W surge capacity. |
Compared with SMAJ20A and 1.5SMC20A, the P6SMB20AT3 uniquely balances compact SMB packaging, UL 497B certification, and full 600 W IEC 61000-4-5 compliance-making it optimal for space-constrained automotive and telecom designs requiring safety-agency validation.
Availability
P6SMB20AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, telecom infrastructure, and medical power supplies requiring stable component supply with long-term lifecycle support.
Supply support for P6SMB20AT3 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 energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and communications markets.
The P6SMB20AT3 belongs to the P6SMBxxAT3G series of unidirectional TVS diodes engineered specifically for high-reliability DC line protection in harsh electromagnetic environments where UL recognition and AEC−Q101 qualification are mandatory.
FAQ
What is the maximum clamping voltage of the P6SMB20AT3 under surge conditions?
The P6SMB20AT3 clamps to a maximum of 27.7 V when subjected to a 22 A peak pulse current (IPP), as defined by the 8.3 ms half-sine waveform per IEC 61000-4-5. This value is measured at the device terminals and represents the highest voltage seen by downstream circuitry during standardized surge testing. The P6SMB20AT3 maintains this clamping performance across its full operating temperature range of −65°C to +150°C.
Is the P6SMB20AT3 suitable for automotive applications?
Yes, the P6SMB20AT3 is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and infotainment systems. Its 600 W surge rating, −65°C to +150°C operating range, and UL 497B recognition make the P6SMB20AT3 appropriate for protecting 12 V and 24 V power rails against load dump and ISO 7637-2 pulses.
Does the P6SMB20AT3 have UL recognition?
Yes, the P6SMB20AT3 carries UL 497B recognition under file #E210057 for isolated loop circuit protection. This certification verifies compliance with stringent tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-making the P6SMB20AT3 valid for use in telecom line interfaces and medical equipment requiring agency-approved surge protection.
What is the working peak reverse voltage (VRWM) of the P6SMB20AT3?
The P6SMB20AT3 has a working peak reverse voltage (VRWM) of 17.1 V, meaning it remains in high-impedance blocking mode up to this DC or continuous peak voltage level. This parameter ensures the P6SMB20AT3 does not conduct significantly during normal operation while providing sufficient margin above common 12 V and 15 V system rails to prevent false triggering.
How does the P6SMB20AT3 compare to bidirectional TVS diodes?
The P6SMB20AT3 is unidirectional and optimized for DC line protection where polarity is fixed, offering tighter VBR tolerance and lower clamping voltage than equivalent bidirectional devices. Unlike bidirectional variants (e.g., P6SMB20CAT3), the P6SMB20AT3 cannot protect AC signals or reverse-polarity connections-its design intent is strictly for single-polarity surge suppression in power rails and digital I/O lines.
P6SMB20AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- -
- Unidirectional Channels:
- -
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- -
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- -
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
P6SMB20AT3 FAQ
1.How can I place an order for P6SMB20AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB20AT3 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 P6SMB20AT3 reliable?
The price and inventory of P6SMB20AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB20AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB20AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB20AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB20AT3?
P6SMB20AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB20AT3 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 P6SMB20AT3?
For technical support, including P6SMB20AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB20AT3 requirements.
6.How does Aetrix verify that P6SMB20AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB20AT3 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 P6SMB20AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB20AT3?
All P6SMB20AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB20AT3, 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 P6SMB20AT3 part is unused and in its original packaging.
Return procedure for P6SMB20AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB20AT3 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
