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onsemi 1SMB30CAT3
- Part No.:
- 1SMB30CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB30CAT3.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,495
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Product details
Overview
1SMB30CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 30 V working peak reverse voltage (VRWM), 36.8 V minimum breakdown voltage (VBR) at 1 mA, clamps to ≤48.4 V at 12.4 A peak pulse current, and responds in <1 ns - used in automotive power line surge suppression and industrial I/O port protection.
For engineers reviewing the 1SMB30CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC ≤ protected device's absolute maximum rating, UL 497B recognition for isolated loop safety, and SMB (DO-214AA) surface-mount compatibility with high-surge industrial layouts.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection against bipolar transients like ESD, lightning-induced surges, and inductive switching spikes without polarity sensitivity. Its low zener impedance and fast <1 ns response ensure minimal overshoot when placed close to ICs or connectors.
The device uses a planar junction structure in thermosetting plastic (Surmetic™ package), rated for –65°C to +150°C operation, with 5 µA max reverse leakage above VRWM and UL 497B certification for isolated loop circuit protection - critical for telecom and medical equipment compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30 V - must be ≥ continuous DC/peak AC voltage of protected line to avoid leakage or conduction during normal operation |
| VBR (min) | 35.06 V @ 1 mA - ensures reliable avalanche initiation before downstream component damage thresholds |
| VC @ IPP | 48.4 V @ 12.4 A - clamping voltage defines maximum stress imposed on protected load during 1 ms 600 W surge |
| PPK | 600 W @ 1 ms - peak power rating validated per 10×1000 µs waveform, defining single-event surge handling capability |
| IR @ VRWM | ≤5 µA - low leakage preserves signal integrity and power efficiency in high-impedance sensing or bias networks |
| Response Time | <1 ns - enables suppression before transient energy couples into IC inputs, minimizing logic upset or latch-up risk |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD immunity without external shielding |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, void-free thermosetting plastic case (Case 403A); dimensions: 4.06–4.57 mm × 3.30–3.81 mm × 1.90–2.41 mm; polarity band not indicated (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode | Bidirectional terminal pair | Either end serves as anode or cathode depending on transient polarity - no orientation required during placement |
| Case | Non-conductive plastic body | No thermal or electrical connection to PCB ground; heat dissipation occurs via leads only |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop protector classification - satisfies safety requirements for telecom, medical, and industrial isolation barriers |
| Low Clamping Ratio | VC/VRWM = 1.61 - tight ratio minimizes overvoltage margin needed between protected IC rating and TVS selection |
| SMB Package Robustness | 260°C soldering tolerance (10 s), modified L-bend leads - supports automated reflow and ensures mechanical reliability in vibration-prone environments |
| High Surge Current | 12.4 A peak pulse current - handles IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) surges without degradation |
| Wide Operating Range | –65°C to +150°C junction temperature - suitable for under-hood automotive, outdoor power supplies, and industrial control cabinets |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V battery line in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Parallel-connected transient clamp limiting voltage to ≤48.4 V during 600 W surges, protecting CAN transceivers and microcontrollers. Use Value: Prevents permanent damage to 5 V/3.3 V logic rails by clamping within 1 ns and sustaining 12.4 A peak current without parametric shift. |
Use Scenario: 24 V digital input module in programmable logic controllers interfacing with field sensors and switches. IC Role / Device Role / Timing Role: Bidirectional surge shunt absorbing ESD (IEC 61000-4-2) and inductive kickback from solenoid coils. Use Value: Eliminates need for separate polarity-specific TVS devices; UL 497B recognition supports certified safety-critical machine control applications. |
| Medical Isolated Data Interface | AC-DC Power Supply Secondary Side |
Use Scenario: RS-485 communication port in patient-monitoring equipment with reinforced isolation barrier per IEC 60601-1. IC Role / Device Role / Timing Role: Transient suppressor on isolated side of signal transformer, referenced to isolated ground. Use Value: UL 497B listing confirms suitability for protector-class use in isolated loops - avoids redesign for regulatory retesting. |
Use Scenario: Output rectifier rail in offline 12 V/5 A SMPS supplying embedded controllers and displays. IC Role / Device Role / Timing Role: Clamp overvoltage from output capacitor discharge or secondary-side MOSFET failure. Use Value: 30 V VRWM matches typical 12 V output with 2.5× safety margin; 5 µA leakage avoids loading regulation feedback network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA | Same VRWM (30 V), identical SMB package, but lower PPK (600 W same), slightly higher VC (48.4 V vs 48.4 V - matched), different marking and tape/reel packaging | No UL 497B recognition; lacks isolated loop protector classification | Select 1SMB30CAT3 where UL safety certification is mandatory; SMBJ30CA acceptable for non-certified consumer-grade designs |
| P6SMB30CA | Same electrical specs (VRWM=30 V, VBR=35.06 V min, VC=48.4 V), identical SMB package, but obsolete ON Semiconductor part number (replaced by 1SMBxxCAT3 series) | Legacy footprint compatibility only; no new production support or lifecycle assurance | 1SMB30CAT3 is the active, recommended replacement with enhanced manufacturing consistency and full documentation support |
Compared with SMBJ30CA and P6SMB30CA, the 1SMB30CAT3 provides UL 497B certification essential for medical/industrial isolation, active production status with traceable sourcing, and identical electrical performance - making it the preferred choice for new designs requiring safety compliance and long-term supply stability.
Availability
1SMB30CAT3 is available at Aetrix Electronics and suitable for automotive power line protection, industrial PLC I/O protection, and medical isolated data interface applications requiring stable component supply, consistent parametric performance, and UL-compliant surge suppression.
Supply support for 1SMB30CAT3 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, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 1SMB30CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-reliability, high-surge industrial and automotive systems requiring UL-recognized, bidirectional overvoltage protection in compact surface-mount packages.
FAQ
What is the working peak reverse voltage (VRWM) of the 1SMB30CAT3?
The 1SMB30CAT3 has a working peak reverse voltage (VRWM) of 30 V. This value represents the maximum continuous DC or peak AC voltage the device can withstand without entering avalanche conduction. Engineers must select VRWM ≥ the normal operating voltage of the protected line - for example, 30 V VRWM is appropriate for 24 V industrial control systems with margin for ripple and transients. The 1SMB30CAT3 maintains ≤5 µA leakage at this voltage.
Does the 1SMB30CAT3 have UL recognition, and for what standard?
Yes, the 1SMB30CAT3 carries UL 497B recognition under File #116110 for the "Protector" classification (QVGV2). This certification validates its use in isolated loop circuits, including telecom interfaces, medical equipment isolation barriers, and industrial safety systems. Unlike generic TVS diodes, the 1SMB30CAT3 passed multiple UL tests - including strike voltage breakdown, endurance conditioning, and dielectric withstand - confirming suitability where regulatory compliance is mandatory.
What is the clamping voltage (VC) of the 1SMB30CAT3 at its rated peak pulse current?
The 1SMB30CAT3 clamps to a maximum of 48.4 V at its rated peak pulse current (IPP) of 12.4 A, measured using the standard 10×1000 µs waveform. This VC value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event. Because VC is only 1.61× VRWM, the 1SMB30CAT3 offers a tight clamping ratio - critical for safeguarding 3.3 V or 5 V logic components without overdesigning downstream voltage margins.
Is the 1SMB30CAT3 unidirectional or bidirectional, and how does that affect PCB layout?
The 1SMB30CAT3 is a bidirectional TVS diode, meaning it provides symmetrical clamping for positive and negative transients without polarity sensitivity. As a result, PCB layout requires no orientation check - either end may connect to the protected line and ground. This simplifies assembly, eliminates polarity-related failures, and supports compact routing in space-constrained applications such as automotive ECUs and modular I/O cards where the 1SMB30CAT3 is commonly deployed.
What package type does the 1SMB30CAT3 use, and what are its key mechanical attributes?
The 1SMB30CAT3 uses the SMB (DO-214AA) surface-mount package, also known as Case 403A. Key mechanical attributes include void-free thermosetting plastic construction, modified L-bend leads for enhanced pad contact area, corrosion-resistant finish, and 260°C soldering tolerance for 10 seconds. Its footprint measures 4.06–4.57 mm × 3.30–3.81 mm, making it compatible with standard automated pick-and-place and reflow processes used for the 1SMB30CAT3 in high-volume industrial manufacturing.
1SMB30CAT3 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 290pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB30CAT3 FAQ
1.How can I place an order for 1SMB30CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB30CAT3 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 1SMB30CAT3 reliable?
The price and inventory of 1SMB30CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB30CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB30CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB30CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB30CAT3?
1SMB30CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB30CAT3 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 1SMB30CAT3?
For technical support, including 1SMB30CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB30CAT3 requirements.
6.How does Aetrix verify that 1SMB30CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB30CAT3 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 1SMB30CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB30CAT3?
All 1SMB30CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB30CAT3, 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 1SMB30CAT3 part is unused and in its original packaging.
Return procedure for 1SMB30CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB30CAT3 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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