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onsemi 1SMB14CAT3
- Part No.:
- 1SMB14CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB14CAT3.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,601
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Product details
Overview
1SMB14CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 14 V working peak reverse voltage (VRWM), 17.2 V maximum clamping voltage at 25.8 A peak pulse current, and sub-1 ns response time. Used in power supplies, automotive ECUs, and industrial controllers to absorb ESD and lightning-induced surges.
For engineers reviewing the 1SMB14CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC ≤ device withstand rating, IPP capability under IEC 61000-4-5 waveforms, UL 497B recognition for isolated loop protection, and SMB (DO-214AA) surface-mount compatibility with FR-4 PCB thermal management.
Technical Context
This bidirectional TVS operates as a voltage-clamped shunt protector-triggering when reverse voltage exceeds its breakdown threshold (15.6–17.2 V at 1 mA) and clamping transients to ≤23.2 V at 25.8 A. Its low zener impedance and fast turn-on (<1 ns) minimize overshoot during surge events.
Thermal design relies on junction-to-lead resistance of 40 °C/W and 3.0 W DC power dissipation at 75 °C lead temperature. The Surmetic SMB package enables high surge robustness (600 W @ 1 ms, 10/1000 µs waveform) while maintaining <5 µA leakage above 10 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 14 V - must be ≥ continuous operating voltage of protected circuit to avoid leakage conduction during normal operation |
| VBR (min/typ/max) | 15.6 / 16.42 / 17.2 V @ 1 mA - defines precise breakdown onset and ensures consistent clamping initiation across units |
| VC @ IPP | 23.2 V @ 25.8 A - maximum voltage seen by downstream circuit during worst-case 600 W transient, critical for IC survivability |
| PPK | 600 W @ 1 ms - peak surge energy absorption capacity per non-repetitive event, compliant with IEC 61000-4-5 Level 4 |
| Response Time | <1 ns - enables suppression before transient propagates into protected ICs, essential for high-speed digital interfaces |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct handling in unshielded assembly environments without additional ESD safeguards |
| UL Recognition | UL 497B (QVGV2) - certified for isolated loop circuit protection, including strike voltage, endurance, and dielectric withstand testing |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, void-free thermosetting plastic case (Case 403A). Dimensions: 4.06 × 3.30 × 2.11 mm (L × W × H); polarity band not marked; modified L-bend leads for enhanced pad adhesion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | High-impedance reference node for bidirectional clamping | Acts as common connection point for both polarities; no polarity marking required due to symmetrical Zener structure |
| Anode | Return path for transient current during positive or negative excursions | Completes low-inductance shunt path to ground or rail; layout requires minimal trace length to limit overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC lines and dual-rail systems without external polarity coordination; eliminates need for back-to-back diode pairs |
| 600 W peak power rating | Withstands IEC 61000-4-5 4th-level surges (4 kV line-earth, 2 kV line-line) with margin, reducing need for staged protection |
| UL 497B certification | Validated for telecom and industrial isolated-loop applications where regulatory compliance is mandatory for safety agency approval |
| Sub-1 ns response | Minimizes voltage overshoot during fast transients (e.g., ESD, relay bounce), preserving signal integrity in high-speed interfaces |
| Low leakage <5 µA | Prevents measurable power loss or bias shift in high-impedance sensor front-ends and battery-powered circuits |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
Use Scenario: Input stage of 24 V DC-DC converter subjected to load dump pulses up to 60 V and ISO 7637-2 transient pulses. IC Role / Device Role: Primary shunt clamp limiting input rail excursion to safe levels for downstream regulators and microcontrollers. Use Value: Clamps 35 V load dump to ≤23.2 V within 1 ns, preventing latch-up or permanent damage to 3.3 V/5 V logic rails. |
Use Scenario: CAN bus physical layer interface exposed to battery transients and ESD events in door module electronics. IC Role / Device Role: Bidirectional overvoltage clamp on CAN_H/CAN_L differential pair, referenced to chassis ground. Use Value: Maintains signal integrity during ±25 kV ESD contact discharge by limiting differential swing to <25 V, preserving bit error rate. |
| Medical Equipment Power Inputs | Telecom Line Interface Cards |
Use Scenario: AC/DC adapter input stage in Class II medical devices requiring reinforced isolation and surge immunity per IEC 60601-1. IC Role / Device Role: Secondary-side transient suppressor on DC output rail protecting isolated DC-DC feedback circuitry. Use Value: UL 497B recognition validates use in patient-connected equipment; 23.2 V clamping prevents optocoupler saturation during surge events. |
Use Scenario: Tip/ring protection on POTS line interface cards handling lightning-induced surges per GR-1089-CORE. IC Role / Device Role: Bidirectional shunt element across transformer secondary, referenced to isolated ground plane. Use Value: 600 W rating handles 10/700 µs telecom surges; low capacitance avoids signal attenuation in voice-band (0.3–3.4 kHz) transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA | Same VRWM (14 V), identical SMB package, but lower PPK (600 W same), slightly higher VC (23.8 V @ 25.5 A) | Functionally interchangeable in most 24 V systems; minor VC difference may affect margin in 20 V-tolerant ICs | Select SMBJ14CA if legacy design validation exists; verify clamping margin against downstream IC absolute maximum ratings |
| 1.5SMC14CA | Higher PPK (1500 W), larger SMC (DO-214AB) package, same VRWM (14 V), VC = 23.2 V @ 64.9 A | Requires PCB footprint change; suited for higher-energy threats (e.g., 10/1000 µs surges >600 W) where space permits | Choose 1.5SMC14CA only when system-level testing confirms need for >600 W surge headroom and SMC layout is feasible |
Compared with SMBJ14CA and 1.5SMC14CA, the 1SMB14CAT3 offers optimal balance of 600 W surge capability, SMB footprint compatibility, and UL 497B certification-making it preferred for space-constrained industrial and automotive designs requiring regulatory-compliant transient protection.
Availability
1SMB14CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMB14CAT3 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 power management, analog, sensors, and discrete components for automotive, industrial, and communications markets.
The 1SMB14CAT3 belongs to the SMB-series transient voltage suppressors-a family engineered for high-energy surge clamping in surface-mount applications where reliability, UL recognition, and fast response are critical.
FAQ
What is the working peak reverse voltage (VRWM) of the 1SMB14CAT3?
The 1SMB14CAT3 has a working peak reverse voltage (VRWM) of 14 V. This value represents the maximum continuous DC or repetitive peak voltage the device can withstand without entering avalanche conduction. It is selected to match or exceed the normal operating voltage of the protected circuit-ensuring low leakage (<5 µA) during steady-state operation while enabling reliable clamping during transients. The 1SMB14CAT3's VRWM is confirmed in the Electrical Characteristics table on page 2 of the official ON Semiconductor datasheet.
What clamping voltage does the 1SMB14CAT3 exhibit under maximum surge conditions?
The 1SMB14CAT3 exhibits a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPP) of 25.8 A. This value is measured using the standardized 10/1000 µs double-exponential surge waveform and defines the upper voltage limit imposed on the protected circuit during a 600 W transient event. The 1SMB14CAT3's VC is guaranteed across temperature and unit variation, making it suitable for safeguarding 24 V systems where downstream ICs have absolute maximum ratings near 25 V.
Is the 1SMB14CAT3 certified for safety-critical applications?
Yes, the 1SMB14CAT3 carries UL 497B recognition (File #116110, category QVGV2) for isolated loop circuit protection. This certification covers rigorous testing-including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance-validating its use in telecom, industrial control, and medical equipment where regulatory compliance is mandatory. The 1SMB14CAT3 is not intended for life-support systems, but its UL 497B status supports safety agency approvals in Class I and Class II installations.
What package type does the 1SMB14CAT3 use, and what are its key mechanical features?
The 1SMB14CAT3 uses the SMB (DO-214AA) surface-mount package, also designated Case 403A. Key mechanical features include void-free transfer-molded thermosetting plastic construction, corrosion-resistant external surfaces, solderable L-bend leads, and a maximum soldering temperature of 260 °C for 10 seconds. Its compact dimensions (4.06 × 3.30 × 2.11 mm) enable high-density PCB layouts while maintaining thermal performance via low junction-to-lead resistance (40 °C/W).
How does the 1SMB14CAT3 compare to unidirectional TVS diodes in circuit implementation?
The 1SMB14CAT3 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients without requiring polarity awareness during placement. Unlike unidirectional devices (e.g., 1SMB14AT3), it eliminates the need for orientation verification on PCBs and simplifies protection of AC-coupled or floating lines such as CAN bus, RS-485, or audio inputs. Its bidirectional behavior stems from an internal back-to-back Zener structure, delivering matched clamping thresholds in either direction-confirmed by identical VRWM and VC specifications for both polarities.
1SMB14CAT3 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 25.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 590pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB14CAT3 FAQ
1.How can I place an order for 1SMB14CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB14CAT3 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 1SMB14CAT3 reliable?
The price and inventory of 1SMB14CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB14CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB14CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB14CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB14CAT3?
1SMB14CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB14CAT3 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 1SMB14CAT3?
For technical support, including 1SMB14CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB14CAT3 requirements.
6.How does Aetrix verify that 1SMB14CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB14CAT3 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 1SMB14CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB14CAT3?
All 1SMB14CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB14CAT3, 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 1SMB14CAT3 part is unused and in its original packaging.
Return procedure for 1SMB14CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB14CAT3 Tags
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DESD3V3E1BL-7B
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