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onsemi 1SMB150AT3
- Part No.:
- 1SMB150AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB150AT3.pdf
- Description:
- TVS DIODE 150VWM 243VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
1SMB150AT3 from ON Semiconductor is a unidirectional 600 W peak power Zener transient voltage suppressor (TVS) designed for parallel overvoltage protection of sensitive electronics. It features a 150 V working peak reverse voltage (VRWM), 185 V minimum breakdown voltage (VBR) at 1.0 mA, and clamps to ≤243 V at 2.5 A peak pulse current (IPP), making it suitable for industrial power supply input stage surge protection.
For engineers reviewing the 1SMB150AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its UL 497B recognition for isolated loop circuit protection, <1.0 ns response time, 135 pF typical junction capacitance at 0 V, ESD rating >16 kV (HBM), and SMB package compatibility with high-surge industrial environments.
Technical Context
The 1SMB150AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its VRWM of 150 V. Its low zener impedance and fast response ensure effective suppression of 10/1000 µs waveform surges up to 600 W without degradation under repeated stress.
It is rated for operating temperatures from −65 °C to +150 °C, with thermal resistance from junction-to-lead (RJL) of 40 °C/W and junction-to-ambient (RJA) of 226 °C/W on FR-4 board. The device exhibits <5.0 µA leakage current above 10 V and forward voltage ≤3.5 V at 30 A, supporting robust bidirectional system-level protection when paired with complementary components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system DC bus rating. |
| VBR (min) | 185 V @ IT = 1.0 mA - Guaranteed avalanche initiation threshold; ensures reliable turn-on margin above VRWM. |
| VC @ IPP | 243 V @ IPP = 2.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case protected node voltage excursion. |
| PPK | 600 W @ 1 ms - Peak single-pulse energy handling capacity; validates suitability for IEC 61000-4-5 Level 4 surges. |
| Ctyp | 135 pF @ 0 V, 1 MHz - Junction capacitance affecting high-frequency signal integrity in data lines or RF-adjacent circuits. |
| ESD Rating | Class 3 (>16 kV HBM) - Confirmed human-body-model electrostatic discharge immunity; supports ruggedized front-end interfaces. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for isolated loop circuit protection; meets safety-critical telecom and industrial isolation requirements. |
Pinout & Package
Surface-mount SMB package (Case 403A), void-free thermosetting plastic body with modified L-bend leads, cathode indicated by polarity band. Mounting position unrestricted; solderable at 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to lower-potential side (e.g., ground or return path); defines unidirectional clamping direction. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 150 V DC rail); carries full surge current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in compact SMB footprint. |
| <1.0 ns response time | Minimizes voltage overshoot during fast transients (e.g., EFT bursts), reducing risk of downstream IC latch-up or damage. |
| UL 497B certified | Validates use in safety-critical isolated loop applications such as analog sensor inputs and fieldbus interfaces. |
| Pb-free (G suffix) packaging | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for reflow compatibility. |
| Low leakage (<5 µA @ VRWM) | Prevents excessive standby power loss in high-impedance monitoring circuits or battery-backed systems. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Interface |
|---|---|
|
Use Scenario: 150 V DC input stage of DIN-rail mounted programmable logic controller (PLC) power supply exposed to load dump and inductive switching surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp transients before they reach upstream rectifier and bulk capacitor. Use Value: Limits voltage excursion to ≤243 V during 2.5 A surge, preventing overvoltage failure of 200 V-rated electrolytic capacitors and MOSFETs. |
Use Scenario: Protection of 12 V CAN_H/CAN_L differential pair in BCM against ISO 7637-2 pulse 1 and pulse 2a transients. IC Role / Device Role / Timing Role: Discrete unidirectional TVS on CAN_H line referenced to chassis ground, absorbing negative-going spikes. Use Value: Clamps −150 V transients to ≤−243 V while maintaining <135 pF capacitance to avoid CAN bit-rate degradation at 500 kbps. |
| Medical Equipment Isolated Sensor Interface | Telecom DSL Line Card Surge Protection |
|
Use Scenario: 150 V isolated auxiliary supply powering analog front-end of patient-monitoring ECG amplifier with reinforced insulation barrier. IC Role / Device Role / Timing Role: UL 497B-recognized TVS on secondary-side DC rail to protect isolation barrier components from secondary-side surges. Use Value: Meets UL 497B strike voltage and endurance conditioning requirements, ensuring continued isolation integrity after repeated 600 W surges. |
Use Scenario: Primary-side protection of ADSL/VDSL line card transformer center-tap connected to 150 V phantom power supply. IC Role / Device Role / Timing Role: Unidirectional TVS between center-tap and ground to suppress longitudinal surges coupled onto twisted-pair lines. Use Value: Handles 10/1000 µs surges up to 600 W without parametric shift, preserving line card uptime in lightning-prone deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ150A | Same VRWM (150 V), identical SMB package, but higher PPK = 600 W and lower VC = 243 V; tighter VBR tolerance (185–209 V vs. 185–209 V). | No functional difference in clamping performance; validated for same IEC 61000-4-5 Level 4 use cases. | Select SMBJ150A if requiring manufacturer-validated automotive qualification (AEC-Q101) alongside identical electrical specs. |
| 1.5SMC150A | Larger SMC package (7.1 × 6.2 mm vs. 4.6 × 3.6 mm), same VRWM and PPK, but higher thermal mass and RJA = 150 °C/W (vs. 226 °C/W). | Better sustained surge handling in high-ambient-temperature enclosures (>85 °C), but requires larger PCB area. | Choose 1.5SMC150A when board space permits and thermal derating at elevated ambient is critical. |
Compared with SMBJ150A and 1.5SMC150A, the 1SMB150AT3 offers identical clamping performance in the smallest surface-mount footprint, optimized for space-constrained industrial controls and medical devices where UL 497B certification and MSL1 reflow compatibility are mandatory.
Availability
1SMB150AT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, medical sensor interfaces, and telecom line cards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1SMB150AT3 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, cloud, and consumer markets.
The 1SMB150AT3 belongs to the SMB series of Zener TVS diodes, engineered specifically for high-energy transient suppression in cost-sensitive, high-reliability industrial and communications equipment with strict safety certification needs.
FAQ
What is the maximum clamping voltage of the 1SMB150AT3 under surge conditions?
The 1SMB150AT3 clamps to a maximum of 243 V when subjected to its rated peak pulse current of 2.5 A (10/1000 µs waveform). This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during transient events. The 1SMB150AT3 achieves this clamping performance while maintaining low dynamic impedance, ensuring consistent protection across its operational lifetime.
Does the 1SMB150AT3 meet UL 497B certification requirements?
Yes, the 1SMB150AT3 is UL Recognized under standard UL 497B (File #E210057, Category QVGQ2) for isolated loop circuit protection. It has passed all required tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation-making it suitable for safety-critical telecom, medical, and industrial isolation barriers where regulatory compliance is mandatory. The 1SMB150AT3 carries this certification as part of the full SMB series qualification.
What is the junction capacitance of the 1SMB150AT3 and how does it affect high-speed signal lines?
The 1SMB150AT3 exhibits a typical junction capacitance of 135 pF at 0 V bias and 1 MHz, as specified in the datasheet. While acceptable for DC power rails and low-speed interfaces (e.g., RS-485, CAN up to 500 kbps), this capacitance may degrade signal integrity on high-speed digital lines (>10 Mbps) or RF paths. For such applications, lower-capacitance alternatives like the 1SMB150AT3's 135 pF must be evaluated against system bandwidth requirements before placement near sensitive nodes.
Can the 1SMB150AT3 be used in automotive applications?
The 1SMB150AT3 is not AEC-Q101 qualified, though its electrical specifications align with many automotive transient protection needs (e.g., ISO 7637-2 pulse 1 and pulse 2a). It is widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and body control modules where full qualification is not mandated. For ASIL-B or higher systems, designers should select AEC-Q101-certified equivalents like SMBJ150A instead of the 1SMB150AT3.
What is the thermal resistance and power derating behavior of the 1SMB150AT3?
The 1SMB150AT3 has a junction-to-ambient thermal resistance (RJA) of 226 °C/W on an FR-4 board using ON Semiconductor's recommended footprint. Its DC power dissipation derates linearly above 25 °C at 4.4 mW/°C, dropping from 0.55 W at 25 °C to zero at 150 °C. For pulsed operation, Figure 3 in the datasheet provides precise derating curves-critical for sustained surge duty cycles beyond single-event testing. This thermal profile directly impacts reliability in enclosed industrial enclosures.
1SMB150AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 135pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB150AT3 FAQ
1.How can I place an order for 1SMB150AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB150AT3 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 1SMB150AT3 reliable?
The price and inventory of 1SMB150AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB150AT3 is usually 5 days.
3.What payment methods are accepted for 1SMB150AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB150AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB150AT3?
1SMB150AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB150AT3 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 1SMB150AT3?
For technical support, including 1SMB150AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB150AT3 requirements.
6.How does Aetrix verify that 1SMB150AT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB150AT3 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 1SMB150AT3 meets industry standards.
7.What is the process for return or replacement of 1SMB150AT3?
All 1SMB150AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB150AT3, 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 1SMB150AT3 part is unused and in its original packaging.
Return procedure for 1SMB150AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB150AT3 Tags
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