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onsemi P6SMB24CAT3
- Part No.:
- P6SMB24CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB24CAT3.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,103
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Product details
Overview
P6SMB24CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 20.5 V working peak reverse voltage (VRWM), 24 V nominal Zener breakdown voltage (VBR), and clamps transients to ≤33.2 V at 18 A peak pulse current - used in power supply input stages, automotive ECUs, and industrial I/O interfaces.
For engineers reviewing the P6SMB24CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system rail, surge current capability under 10/1000 µs waveform, UL 497B certification for isolated loop protection, and SMB package thermal performance on FR-4 PCBs.
Technical Context
The P6SMB24CAT3 operates as a bidirectional avalanche diode with symmetrical clamping behavior above ±24 V breakdown. Its low zener impedance (<1 Ω typical) and sub-1 ns response time enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges without signal distortion.
It is rated for 600 W non-repetitive peak power at 1 ms pulse width (10/1000 µs waveform), with thermal derating to 0.55 W at 25°C ambient and junction-to-lead thermal resistance of 40°C/W - requiring minimum copper pad area per ON Semiconductor's Case 403A footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms, 10/1000 µs waveform - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 20.5 V - maximum continuous DC or peak AC voltage before conduction begins |
| Zener Breakdown Voltage (VBR) | 22–25.2 V @ 1 mA test current - defines symmetric turn-on threshold for bidirectional clamping |
| Clamping Voltage (VC) | 33.2 V @ 18 A IPP - maximum voltage seen by protected circuit during full-rated surge |
| Leakage Current (IR) | <5 µA @ 20.5 V - negligible standby power loss and minimal loading on source |
| Junction Capacitance (Cj) | 415 pF @ 0 V, 1 MHz - impacts high-frequency signal integrity in data line protection |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - meets IEC 61000-4-2 Level 4 immunity requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, void-free thermosetting plastic case (Case 403A). Dimensions: 4.32 mm × 3.56 mm × 2.13 mm (L × W × H); lead finish: Pb-free, solderable per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band Side) | High-side terminal for bidirectional conduction | Identified by polarity band; functions as anode during negative transients and cathode during positive transients |
| Anode (Opposite Band Side) | Low-side terminal for bidirectional conduction | Unmarked side; completes symmetrical clamping path across protected node and ground/rail |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating differential signals without polarity constraints |
| UL 497B recognition (QVGQ2) | Validated for isolated loop circuit protection - supports safety-certified designs in telecom and medical equipment |
| Surmetic® package reliability | Void-free molding and modified L-bend leads ensure mechanical robustness and consistent solder joint integrity |
| Fast response time | <1 ns turn-on - limits voltage overshoot before clamping engages, critical for protecting fast logic and ADC inputs |
| Thermal derating support | Specified junction-to-lead (40°C/W) and junction-to-ambient (226°C/W) resistances enable accurate board-level thermal design |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Parallel-connected TVS diode providing primary overvoltage clamp ahead of upstream DC-DC converter. Use Value: Limits transient voltage to ≤33.2 V, preventing damage to 36 V-rated input capacitors and enabling compliance with IEC 61000-4-5 Level 3 (1 kV surge). |
Use Scenario: LIN bus transceiver and sensor analog inputs in BCM subjected to battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between LIN line and ground, and across sensor supply rails. Use Value: Clamps both positive and negative transients up to ±33.2 V while maintaining <5 µA leakage - preserving signal accuracy and reducing false triggers. |
| Medical Equipment Isolated Signal Interface | Telecom DSL Line Card Surge Protection |
Use Scenario: Secondary-side analog front-end of isolated patient monitoring interface, where galvanic separation requires certified transient protection. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on isolated 5 V or 3.3 V rails feeding ADCs and op-amps. Use Value: Meets Underwriters Laboratories' protector category requirements for medical isolation barriers - validated for strike voltage, endurance, and dielectric withstand. |
Use Scenario: Primary protection stage on twisted-pair DSL line interface before hybrid transformer and line driver IC. IC Role / Device Role / Timing Role: First-line bidirectional suppressor absorbing longitudinal surges coupled onto copper pairs from lightning induction. Use Value: 600 W peak power rating handles 10/1000 µs surges up to 18 A while limiting voltage to 33.2 V - preserving line driver output stage and downstream PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Unidirectional; 24 V VBR, 38.9 V VC @ 15.4 A; SMA package (smaller footprint, higher RJA) | Requires external polarity management; less suitable for AC or floating nodes | Select when protecting DC-only rails with space-constrained layouts and no need for bidirectional symmetry |
| 1.5KE24CA | Through-hole DO-201 package; same 24 V VBR, 38.9 V VC @ 15.4 A; higher thermal mass but larger board area | Better for high-reliability, low-volume industrial assemblies where manual soldering is acceptable | Choose for legacy designs, repair parts, or environments requiring mechanical robustness over SMT density |
Compared with SMAJ24A and 1.5KE24CA, the P6SMB24CAT3 offers bidirectional operation in a compact SMB package with UL 497B recognition - making it optimal for modern SMT-based medical, telecom, and automotive systems requiring certified, polarity-agnostic surge protection.
Availability
P6SMB24CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, and medical signal interfaces requiring stable component supply, RoHS-compliant packaging, and UL-recognized transient protection.
Supply support for P6SMB24CAT3 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The P6SMB24CAT3 belongs to the P6SMBxxCAT3 series of 600 W bidirectional TVS diodes - engineered for high-surge, UL-certified protection in space-constrained, high-reliability applications across transportation and healthcare electronics.
FAQ
What is the clamping voltage of the P6SMB24CAT3 at its rated peak pulse current?
The P6SMB24CAT3 clamps to a maximum of 33.2 V at its rated peak pulse current of 18 A (10/1000 µs waveform). This value is measured under standardized test conditions per JEDEC standards and ensures predictable overvoltage limiting for downstream components such as DC-DC controllers and microcontrollers. The P6SMB24CAT3 maintains this clamping performance across its specified operating temperature range of −65°C to +150°C.
Is the P6SMB24CAT3 unidirectional or bidirectional, and how does that affect circuit placement?
The P6SMB24CAT3 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients - ideal for AC lines, differential signals, or floating nodes where polarity is undefined. Unlike unidirectional variants, it requires no orientation during placement and functions identically regardless of voltage polarity across its terminals. This simplifies layout and eliminates risk of incorrect installation in the P6SMB24CAT3 application.
Does the P6SMB24CAT3 meet UL 497B certification, and what does that cover?
Yes, the P6SMB24CAT3 is UL Recognized under standard UL 497B (File #E210057, Category QVGQ2) for protectors in isolated loop circuits. This certification validates performance in strike voltage breakdown, endurance conditioning, temperature cycling, dielectric withstand, and discharge testing - confirming suitability for safety-critical telecom, medical, and industrial isolation barriers. The P6SMB24CAT3 achieves this as part of the fully recognized P6SMBxxCAT3 series.
What is the thermal resistance and power derating behavior of the P6SMB24CAT3?
The P6SMB24CAT3 has a junction-to-lead thermal resistance (RJL) of 40°C/W and junction-to-ambient resistance (RJA) of 226°C/W on a standard FR-4 board with ON Semiconductor's recommended footprint. Its DC power dissipation derates linearly above 75°C (25 mW/°C) and ambient above 25°C (4.4 mW/°C). These values are essential for calculating safe operating area in the P6SMB24CAT3 application under sustained surge duty cycles.
How does the P6SMB24CAT3 compare to the P6SMB24A variant?
The P6SMB24CAT3 is the bidirectional version, while P6SMB24A is unidirectional - differing only in internal construction and polarity marking. Both share identical VRWM (20.5 V), VBR (22–25.2 V), VC (33.2 V), and package (SMB). The P6SMB24CAT3 must be used where AC transients or undefined polarity exist; the P6SMB24A suffices for DC rails with known polarity. No other electrical or mechanical differences exist between the P6SMB24CAT3 and P6SMB24A.
P6SMB24CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 18A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 415pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB24CAT3 FAQ
1.How can I place an order for P6SMB24CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB24CAT3 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 P6SMB24CAT3 reliable?
The price and inventory of P6SMB24CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB24CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB24CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB24CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB24CAT3?
P6SMB24CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB24CAT3 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 P6SMB24CAT3?
For technical support, including P6SMB24CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB24CAT3 requirements.
6.How does Aetrix verify that P6SMB24CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB24CAT3 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 P6SMB24CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB24CAT3?
All P6SMB24CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB24CAT3, 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 P6SMB24CAT3 part is unused and in its original packaging.
Return procedure for P6SMB24CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB24CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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