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onsemi 1SMB36CAT3
- Part No.:
- 1SMB36CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- -
- Datasheet:
-
1SMB36CAT3.pdf
- Description:
- TVS DIODE 36V 58.1V SMB
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Inventory:9,162
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Product details
Overview
1SMB36CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 36 V working peak reverse voltage (VRWM), 44.2 V clamping voltage at 10.3 A peak pulse current, and sub-1 ns response time - deployed in power supplies, industrial controls, and automotive ECUs to absorb ESD and lightning-induced surges.
For engineers reviewing the 1SMB36CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, VC margin relative to IC absolute maximum ratings, UL 497B certification for isolated loop protection, and SMB package thermal performance under repetitive surge conditions.
Technical Context
The 1SMB36CAT3 operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown to clamp transients symmetrically across both polarities. Its low zener impedance and fast <1 ns turn-on ensure minimal overshoot when placed close to protected ICs, with clamping defined at IT = 1.0 mA and IPP = 10.3 A per 10/1000 µs waveform.
Thermal design relies on junction-to-lead resistance (RJL = 40 °C/W) and derating above 75°C; it is rated for –65°C to +150°C operation and qualified per UL 497B for isolated loop circuit protection - distinguishing it from generic ESD diodes by its high-energy 600 W single-pulse capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36 V - must be ≥ continuous DC/peak AC operating voltage of protected line |
| VBR (min/typ/max) | 40.0 / 42.11 / 44.2 V @ 1.0 mA - defines reliable avalanche onset threshold |
| VC @ IPP | 58.1 V @ 10.3 A - maximum clamped voltage seen by downstream circuit during 10/1000 µs surge |
| PPK | 600 W @ 1 ms - non-repetitive surge energy handling per IEC 61000-4-5 Level 4 |
| IR @ VRWM | < 5 µA - ensures negligible leakage current in normal operation |
| Response Time | < 1 ns - enables suppression before logic-level ICs experience overstress |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 system-level ESD immunity |
Pinout & Package
1SMB36CAT3 uses the SMB (DO-214AA, Case 403A) surface-mount package: void-free thermosetting plastic body, modified L-bend leads for enhanced pad adhesion, and polarity band omitted due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode side marked) | Transient conduction path (bidirectional) | Both terminals function identically; no polarity marking required for AC/symmetrical surge paths |
| Anode (Unmarked side) | Transient conduction path (bidirectional) | Same electrical role as cathode; device clamps equally in either direction |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses, or ungrounded systems without polarity concerns |
| UL 497B recognition | Validated for isolated loop circuit protection - required for telecom, industrial fieldbus, and medical signal isolation compliance |
| 600 W peak power rating | Withstands 10/1000 µs surges up to 10.3 A - exceeds IEC 61000-4-5 Level 4 (4 kV line-to-ground) |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot margin needed between protected IC's max rating and VRWM selection |
| SMB package thermal performance | RJL = 40 °C/W enables sustained operation at TL ≤ 75°C - supports high-density PCB layouts with limited copper area |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Parallel-connected TVS that clamps transients before they reach primary-side controller IC and bulk capacitor. Use Value: 58.1 V clamping ensures MCU and gate driver ICs (rated ≤ 60 V) remain within safe operating area during 120 V/50 ms load dump events. | Use Scenario: CAN FD data lines in vehicle body control unit subjected to ESD and battery reversal transients. IC Role / Device Role / Timing Role: Bidirectional surge shunt placed directly at connector entry point to protect CAN transceiver inputs. Use Value: Sub-1 ns response and UL 497B certification guarantee immunity to ±8 kV contact ESD (IEC 61000-4-2) without signal distortion. |
| Medical Isolated Sensor Interface | Telecom DSL Line Card |
Use Scenario: Analog front-end of patient-monitoring ECG amplifier with galvanic isolation barrier. IC Role / Device Role / Timing Role: Transient suppressor on secondary-side analog supply rail to prevent latch-up in precision op-amps and ADCs. Use Value: 36 V VRWM matches 33 V isolated DC-DC output; <5 µA leakage avoids offset drift in µV-level biopotential measurements. | Use Scenario: POTS line interface circuit in DSLAM equipment handling lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary protection element across transformer-coupled tip/ring lines prior to hybrid coupler and line driver. Use Value: 600 W rating handles 10/700 µs telecom surges (ITU-T K.21) while UL 497B approval satisfies Telcordia GR-1089-CORE requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA | Same SMB package, identical VRWM (36 V) and VC (58.1 V), but lower PPK = 600 W (same rating); minor footprint variance in lead form. | No functional difference in surge handling; validated for same UL 497B use cases. | Select SMBJ36CA if sourcing flexibility is prioritized - identical electrical specs and qualification profile. |
| 1.5SMC36CA | Higher PPK = 1500 W, larger SMC (DO-214AB) package, RJL = 25 °C/W - superior thermal dissipation but requires 3× PCB area. | Used where multi-pulse robustness or extended ambient temperature operation (>85°C) is required. | Choose 1.5SMC36CA only when 600 W is insufficient - e.g., high-duty-cycle industrial motor drives with frequent switching transients. |
Compared with SMBJ36CA, 1SMB36CAT3 offers identical surge performance in a cost-optimized Surmetic SMB package; versus 1.5SMC36CA, it trades higher energy capacity for smaller footprint and lower assembly cost - ideal for space-constrained consumer and automotive modules.
Availability
1SMB36CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, medical sensor interfaces, and telecom line cards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMB36CAT3 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 power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1SMB36CAT3 belongs to the SMB-series transient voltage suppressor family, engineered specifically for high-energy, surface-mount surge protection in space-constrained systems where UL 497B certification and sub-1 ns response are mandatory.
FAQ
What is the clamping voltage of the 1SMB36CAT3 under maximum surge conditions?
The 1SMB36CAT3 has a maximum clamping voltage (VC) of 58.1 V at 10.3 A peak pulse current (IPP), measured using the standard 10/1000 µs double-exponential waveform. This value is critical for ensuring downstream ICs - such as microcontrollers or CAN transceivers rated for ≤60 V - remain within their absolute maximum voltage limits during surge events. The 1SMB36CAT3 maintains this clamping performance across its full operating temperature range.
Is the 1SMB36CAT3 suitable for bidirectional signal line protection like RS-485 or CAN bus?
Yes, the 1SMB36CAT3 is explicitly designed as a bidirectional TVS diode, making it appropriate for protecting balanced differential interfaces including RS-485 and CAN bus. Its symmetrical breakdown behavior ensures equal clamping on both polarities without requiring orientation during placement. For CAN FD applications, the 1SMB36CAT3's 58.1 V clamping and UL 497B certification support compliance with ISO 11898-2 and IEC 61000-4-2 requirements when used with proper layout practices.
Does the 1SMB36CAT3 require a heatsink for standard surge duty cycles?
No, the 1SMB36CAT3 does not require an external heatsink for single-event or low-duty-cycle surge protection. Its thermal resistance from junction to lead (RJL = 40 °C/W) and 600 W peak rating are intended for non-repetitive 1 ms pulses. However, for applications involving frequent surges or elevated ambient temperatures (>75°C), PCB copper area should follow ON Semiconductor's recommended footprint (Case 403A) to maintain junction temperature below 150°C. The 1SMB36CAT3 is not rated for continuous power dissipation.
How does the UL 497B recognition benefit designs using the 1SMB36CAT3?
UL 497B recognition certifies the 1SMB36CAT3 for use in isolated loop circuit protection - a requirement for telecom, industrial process control, and medical equipment where galvanic isolation barriers must withstand surge and lightning events without compromising safety. Unlike basic flammability-rated packages, UL 497B validation includes dielectric withstand, endurance conditioning, and strike voltage breakdown testing. This allows the 1SMB36CAT3 to serve as the primary protector in certified end-equipment without additional system-level validation.
Can the 1SMB36CAT3 replace older 1N6267 series diodes in existing designs?
The 1SMB36CAT3 is not a direct drop-in replacement for through-hole 1N6267 series diodes due to its SMB surface-mount package, different thermal path, and updated surge waveform definition (10/1000 µs vs. legacy 1.2/50 µs). While electrical parameters (VRWM, VC) align closely, PCB layout, soldering profile, and thermal management must be revalidated. For new designs, the 1SMB36CAT3 offers superior surge robustness and smaller footprint; for legacy upgrades, consult ON Semiconductor's cross-reference guide and perform board-level surge testing per IEC 61000-4-5.
1SMB36CAT3 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:
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- Operating Temperature:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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1SMB36CAT3 FAQ
1.How can I place an order for 1SMB36CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB36CAT3 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 1SMB36CAT3 reliable?
The price and inventory of 1SMB36CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB36CAT3 is usually 5 days.
3.What payment methods are accepted for 1SMB36CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB36CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB36CAT3?
1SMB36CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB36CAT3 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 1SMB36CAT3?
For technical support, including 1SMB36CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB36CAT3 requirements.
6.How does Aetrix verify that 1SMB36CAT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB36CAT3 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 1SMB36CAT3 meets industry standards.
7.What is the process for return or replacement of 1SMB36CAT3?
All 1SMB36CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB36CAT3, 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 1SMB36CAT3 part is unused and in its original packaging.
Return procedure for 1SMB36CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB36CAT3 Tags
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