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onsemi 1SMB15CAT3
- Part No.:
- 1SMB15CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB15CAT3.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,463
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Product details
Overview
1SMB15CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 15 V working peak reverse voltage (VRWM), 24.4 V clamping voltage (VC) at 24.0 A peak pulse current, and sub-1 ns response time - deployed in power supply inputs, automotive ECUs, and industrial I/O interfaces to absorb ESD and lightning-induced surges.
For engineers reviewing the 1SMB15CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, VC vs. protected IC's absolute maximum rating, surge current capability under 10/1000 µs waveform, and UL 497B recognition for isolated loop protection compliance.
Technical Context
The 1SMB15CAT3 operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transients above VRWM. Its low zener impedance (< 1 Ω typical) and fast turn-on ensure minimal overshoot during <1 ns response, critical for protecting 3.3 V/5 V logic rails and analog front-ends.
It is rated for 600 W non-repetitive peak power (10/1000 µs waveform), with thermal derating from 0.55 W at TA = 25°C to zero at TA = 150°C. The device meets Class 3 HBM ESD (>16 kV) and UL 497B for isolated loop circuit protection - confirming suitability for telecom and medical equipment interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 15 V - must be ≥ continuous DC or peak AC operating voltage of protected line |
| VBR (min/typ/max) | 16.42 / 17.58 / 18.5 V @ 1 mA - defines reliable conduction onset under transient stress |
| VC @ IPP | 24.4 V @ 24.0 A - maximum clamped voltage seen by downstream circuit during full-rated surge |
| IPP | 24.0 A - peak pulse current supported under standard 10/1000 µs waveform |
| Leakage IR | <5 µA @ 15 V - ensures negligible standby power loss and signal integrity in high-impedance nodes |
| Response Time | <1 ns - limits voltage overshoot before clamping engages, essential for protecting fast CMOS inputs |
| ESD Rating | Class 3 HBM (>16 kV) - exceeds IEC 61000-4-2 Level 4 for system-level ESD immunity |
Pinout & Package
1SMB15CAT3 is housed in an SMB (DO-214AA) surface-mount package per Case 403A outline, featuring void-free thermosetting plastic encapsulation, corrosion-resistant finish, and modified L-bend leads for enhanced solder joint reliability. Polarity band is omitted due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as cathode during positive half-cycle and anode during negative half-cycle - no polarity marking required |
| Case (exposed pad not present) | Non-conductive thermoplastic body | No thermal or electrical connection to PCB; mounting position unrestricted |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or differential buses without polarity concerns |
| UL 497B recognition | Validates compliance for isolated loop protection in telecom and industrial control systems |
| 600 W peak power rating | Supports robust surge immunity per IEC 61000-4-5 (Level 4: 4 kV line-to-earth) |
| Sub-1 ns response | Minimizes voltage overshoot before clamping, preserving timing margins in high-speed interfaces |
| Low leakage <5 µA | Prevents signal distortion or bias shift in precision analog circuits and high-Z sensor inputs |
Applications
| Industrial Power Supply Input | Automotive Body Control Module |
|---|---|
|
Use Scenario: 24 V DC input rail exposed to load dump and jump-start transients in factory automation PLCs. IC Role / Device Role / Timing Role: Parallel-connected TVS that clamps surges >40 V to ≤24.4 V within <1 ns to protect upstream DC-DC controllers and downstream microcontrollers. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies during ISO 16750-2 load dump events (up to 60 V, 200 ms). |
Use Scenario: CAN bus physical layer interface in vehicle door modules subject to ESD and battery reversal. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp placed across CAN_H/CAN_L differential pair to limit common-mode transients. Use Value: Maintains CAN signal integrity during ±15 kV contact ESD (IEC 61000-4-2) without disrupting bit timing or causing bus-off errors. |
| Medical Equipment Isolated Interface | Telecom Line Card Protection |
|
Use Scenario: 5 V isolated power domain feeding patient-monitoring analog front-end with strict leakage limits. IC Role / Device Role / Timing Role: UL 497B–recognized TVS on secondary-side power rail to meet safety isolation barrier requirements. Use Value: Enables certification compliance for isolated loop protection while adding <5 µA leakage - avoiding offset drift in 24-bit ADC references. |
Use Scenario: T1/E1 line interface card in central office equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage surge protector on transformer-coupled line side, preceding integrated line driver/receiver. Use Value: Absorbs 600 W (10/1000 µs) surges per GR-1089-CORE, reducing secondary protection burden and extending system MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | Same SMB package, identical VRWM (15 V) and VC (24.4 V), but rated for 600 W with tighter VBR tolerance (16.7–18.5 V vs. 16.42–18.5 V) | Preferred for designs requiring tighter breakdown consistency across temperature and lot variance | Select SMBJ15CA when statistical process control of VBR distribution is critical for production yield |
| P6SMB15CA | Same electrical specs and SMB package, but manufactured by STMicroelectronics with identical UL 497B recognition and 1 ns response | Validated drop-in alternative where dual-sourcing or regional supply chain diversification is required | Choose P6SMB15CA to mitigate single-source risk without layout or validation changes |
Compared with 1SMB15CAT3, SMBJ15CA offers tighter VBR control for high-yield manufacturing, while P6SMB15CA provides second-source assurance with identical clamping performance and safety certification - both preserve board space and surge handling without redesign.
Availability
1SMB15CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, medical isolated interfaces, and telecom line cards requiring stable component supply across multi-year production cycles.
Supply support for 1SMB15CAT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMB15CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-energy surge protection in space-constrained surface-mount applications where reliability, UL recognition, and fast clamping are mandatory.
FAQ
What is the clamping voltage of the 1SMB15CAT3 under maximum rated surge current?
The 1SMB15CAT3 has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current (IPP) of 24.0 A under the standard 10/1000 µs waveform. This value is measured at TA = 25°C and guarantees the protected circuit will not experience more than 24.4 V during a full 600 W transient event. The 1SMB15CAT3 maintains this clamping performance across its specified operating temperature range.
Does the 1SMB15CAT3 require polarity-aware PCB layout?
No - the 1SMB15CAT3 is a bidirectional TVS diode with symmetrical Zener characteristics, meaning either terminal functions as anode or cathode depending on transient polarity. Its SMB package carries no polarity marking, and PCB footprint design does not require orientation alignment. This simplifies layout and eliminates risk of reverse installation during assembly of the 1SMB15CAT3.
Is the 1SMB15CAT3 certified for use in safety-isolated circuits?
Yes - the 1SMB15CAT3 is UL Recognized under UL 497B (File #116110, QVGV2 category) for isolated loop circuit protection. This certification confirms successful completion of strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - validating its use in medical, telecom, and industrial systems requiring reinforced isolation barriers where the 1SMB15CAT3 is deployed on the secondary side.
How does the 1SMB15CAT3 handle repeated surge events?
The 1SMB15CAT3 is rated for non-repetitive 600 W surges (10/1000 µs). For repetitive events, derating is required: peak power drops to ~50% at TA = 75°C and reaches zero at TA = 150°C. Duty cycle also reduces allowable peak current - e.g., at 1% duty cycle and 1 ms pulse width, IPP must be reduced per Figure 6 in the datasheet. Sustained repetition requires thermal analysis of the 1SMB15CAT3's PCB copper area and ambient conditions.
What is the leakage current specification for the 1SMB15CAT3 at its working voltage?
The 1SMB15CAT3 specifies a maximum reverse leakage current (IR) of 5.0 µA when biased at its working peak reverse voltage (VRWM) of 15 V, measured at TA = 25°C. This low leakage ensures minimal loading on high-impedance nodes such as sensor bias networks or reference dividers, and remains stable across the full –65°C to +150°C operating temperature range - a key design factor for precision circuits using the 1SMB15CAT3.
1SMB15CAT3 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 555pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB15CAT3 FAQ
1.How can I place an order for 1SMB15CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB15CAT3 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 1SMB15CAT3 reliable?
The price and inventory of 1SMB15CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB15CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB15CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB15CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB15CAT3?
1SMB15CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB15CAT3 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 1SMB15CAT3?
For technical support, including 1SMB15CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB15CAT3 requirements.
6.How does Aetrix verify that 1SMB15CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB15CAT3 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 1SMB15CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB15CAT3?
All 1SMB15CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB15CAT3, 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 1SMB15CAT3 part is unused and in its original packaging.
Return procedure for 1SMB15CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB15CAT3 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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