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onsemi SMF150AT1G
- Part No.:
- SMF150AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF150AT1G.pdf
- Description:
- TVS DIODE 150VWM 243VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:8,665
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Product details
Overview
SMF150AT1G from onsemi is a unidirectional Zener transient voltage suppressor (TVS) diode in SOD-123FL package, designed for clamping high-energy ESD and surge transients. It features a 150 V working peak reverse voltage (VRWM), 185 V maximum breakdown voltage (VBR), 243 A peak pulse current (IPP), and clamps to ≤275 V at IPP - ideal for protecting DC power rails and I/O lines in industrial power supplies and telecom infrastructure.
For engineers reviewing the SMF150AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping voltage vs. device withstand level, surge rating per IEC 61000-4-4/4-2, thermal derating at elevated ambient, and SOD-123FL board space constraints.
Technical Context
The SMF150AT1G operates as a unidirectional avalanche diode, entering low-impedance conduction when reverse voltage exceeds its VBR of 167–185 V. Its response time is typically <1 ns, enabling effective suppression of fast transients such as ESD (IEC61000-4-2 Level 4, >16 kV HBM) and electrical fast transients (IEC61000-4-4, 40 A).
It delivers 175 W peak pulse power (10/1000 µs waveform), with thermal resistance junction-to-cathode of 26 °C/W and junction-to-ambient of 325 °C/W (on FR-4 PCB with minimum pad). The device is Pb-free, RoHS-compliant, and qualified to MSL 1 with 260 °C reflow tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 150 V - maximum continuous reverse operating voltage before clamping begins; must exceed system's max DC/peak AC rail voltage. |
| VBR @ IT=1 A | 167–185 V - guaranteed avalanche onset range; ensures predictable turn-on margin above VRWM. |
| VC @ IPP=243 A | ≤275 V - maximum clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream circuitry. |
| IPP | 243 A - peak pulse current capability under standard 10/1000 µs waveform; determines surge energy handling (≈175 W). |
| IR @ VRWM | 1 µA - ultra-low leakage at rated working voltage; avoids parasitic loading on high-impedance or battery-backed circuits. |
| Response Time | <1 ns - enables protection against sub-nanosecond ESD events before sensitive ICs are damaged. |
| ESD Rating | >16 kV HBM - meets IEC61000-4-2 Level 4; suitable for handheld and exposed interface applications. |
Pinout & Package
SOD-123FL surface-mount package: 1.65 mm × 2.70 mm footprint, 1.0 mm max height, cathode-indicated by polarity band. Optimized for automated placement and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to protected line (e.g., VBUS, signal); conducts when transient exceeds VRWM. |
| 2 (Non-banded End) | Anode | Typically tied to ground or lower-potential reference; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD-123FL package | 1.0 mm max height enables use in ultra-thin consumer and portable electronics where Z-height is constrained. |
| 175 W peak pulse power (10/1000 µs) | Supports robust protection in industrial power inputs subject to lightning-induced surges per IEC 61000-4-5. |
| IEC61000-4-4 40 A EFT immunity | Validated performance against repetitive fast transients common in motor drives, PLCs, and factory automation equipment. |
| Pb-Free and MSL 1 compliant | Enables lead-free reflow assembly without moisture sensitivity concerns; compatible with standard SMT processes. |
| 8.45 mm² footprint area | Minimizes PCB real estate vs. larger DO-214AC/SMA packages while maintaining comparable surge capability. |
Applications
| Industrial Power Input Protection | Telecom DC Feeder Line Protection |
|---|---|
Use Scenario: 48 V DC power input stage of a remote radio unit (RRU) exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between +48 V rail and chassis ground to clamp transients before they reach DC/DC converters and FET drivers. Use Value: Clamps 10/1000 µs surges up to 243 A while limiting voltage to ≤275 V, preserving downstream 60 V-rated MOSFETs and controllers. | Use Scenario: -48 V DC feeding line in central office equipment, subject to switching transients and ESD during hot-swap module insertion. IC Role / Device Role / Timing Role: Reverse-polarity TVS connected anode-to-rail, cathode-to-ground to protect against negative-going surges on telecom power buses. Use Value: 1 µA leakage at VRWM avoids drain on backup batteries; <1 ns response prevents latch-up in line-card supervisors and PHY ICs. |
| Programmable Logic Controller I/O Protection | Motor Drive Control Signal Protection |
Use Scenario: 24 V digital input channel on a PLC module receiving signals from field sensors in electrically noisy factory environments. IC Role / Device Role / Timing Role: TVS placed across input terminal and common reference to shunt EFT bursts (IEC61000-4-4) and contact discharge ESD. Use Value: 175 W surge rating handles repeated 40 A EFT pulses; 150 V VRWM provides safe margin above 24 V nominal with ripple and tolerance. | Use Scenario: Enable/disable control line (e.g., EN pin of gate driver) in a servo drive, routed alongside high-dI/dt power traces. IC Role / Device Role / Timing Role: Low-capacitance TVS suppressing coupled transients without distorting fast PWM or fault-signaling edges. Use Value: Sub-1 ns response ensures clamping occurs before 100 ns logic thresholds are violated; SOD-123FL minimizes trace stub inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC150-01ET1G | Same VRWM (150 V) and package (SOD-123FL), but lower IPP (190 A) and higher VC (290 V); optimized for lower-cost ESD-only use cases. | Less suitable for high-energy surges (e.g., IEC 61000-4-5); better fit for USB/UART port ESD where peak current rarely exceeds 100 A. | Select SAC150-01ET1G only if system-level surge testing confirms 190 A IPP is sufficient and clamping voltage margin allows 290 V. |
| 1.5SMC150A | Higher power rating (1500 W), DO-214AB package (larger footprint, 3.6 mm × 7.1 mm), same VRWM (150 V) and VBR range. | Used where PCB layout permits larger devices and higher surge immunity (e.g., AC mains front-end, outdoor enclosures). | Choose 1.5SMC150A when 175 W is insufficient and board space allows DO-214AB; not drop-in due to size and thermal profile differences. |
Compared with SAC150-01ET1G, SMF150AT1G offers 28% higher IPP and 15 V lower VC - critical for protecting 200 V-rated gate drivers. Versus 1.5SMC150A, it trades surge capacity for 75% smaller footprint and faster thermal response in compact modules.
Availability
SMF150AT1G is available at Aetrix Electronics and suitable for industrial power inputs, telecom DC feeder lines, PLC I/O modules, and motor drive control signal protection requiring stable component supply and long-term obsolescence management.
Supply support for SMF150AT1G 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The SMF series belongs to onsemi's transient voltage suppression portfolio, engineered specifically for compact, high-reliability DC rail and signal-line protection in space-constrained, high-surge environments.
FAQ
What is the working peak reverse voltage (VRWM) specification for SMF150AT1G?
The SMF150AT1G has a VRWM of 150 V, meaning it remains non-conductive up to this reverse voltage under normal operation. This value is selected to provide ≥10% margin above typical 130–140 V peak voltages found in 48 V telecom systems and industrial 24/48 V DC distribution networks. Exceeding VRWM initiates avalanche clamping, making VRWM a critical parameter for reliable system-level surge design.
How does the clamping voltage (VC) of SMF150AT1G compare to its breakdown voltage (VBR)?
The SMF150AT1G exhibits a VBR range of 167–185 V at 1 A test current, while its maximum clamping voltage VC is 275 V at 243 A peak pulse current. This 90–108 V differential reflects the dynamic impedance rise under high-current surge conditions. Designers must ensure downstream components can tolerate up to 275 V, not just the static VBR, during worst-case transients.
Is SMF150AT1G suitable for bidirectional transient protection?
No - SMF150AT1G is a unidirectional TVS diode, intended for DC rails or signals with defined polarity. It conducts only during reverse overvoltage (cathode positive relative to anode). For AC lines or bidirectional data signals, a dedicated bidirectional part like SMBJ150A or P6SMB150A is required; using SMF150AT1G in such configurations risks failure or incomplete protection.
What is the thermal resistance and derating behavior of SMF150AT1G?
SMF150AT1G has a junction-to-cathode thermal resistance (RJcathode) of 26 °C/W and junction-to-ambient (RJA) of 325 °C/W on FR-4 with minimum recommended pads. Its peak pulse power derates linearly above 25 °C ambient, dropping to ~70% at 100 °C - critical for high-temperature industrial deployments. Continuous power dissipation is limited to 385 mW at 25 °C, derating by 4.0 mW/°C above that point.
Does SMF150AT1G meet international ESD and surge immunity standards?
Yes - SMF150AT1G is characterized for IEC61000-4-2 Level 4 ESD (>16 kV HBM) and IEC61000-4-4 electrical fast transient (EFT) immunity at 40 A. These ratings are verified per onsemi's test methodology and align with requirements for industrial equipment, telecom infrastructure, and programmable logic controllers. It is not rated to IEC61000-4-5 (lightning surge), where higher-energy devices like 1.5SMC150A are recommended.
SMF150AT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SOD-123F
- 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):
- 700mA
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123FL
SMF150AT1G FAQ
1.How can I place an order for SMF150AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF150AT1G 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 SMF150AT1G reliable?
The price and inventory of SMF150AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF150AT1G is usually 5 days.
3.What payment methods are accepted for SMF150AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF150AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF150AT1G?
SMF150AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF150AT1G 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 SMF150AT1G?
For technical support, including SMF150AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF150AT1G requirements.
6.How does Aetrix verify that SMF150AT1G is sourced from the original manufacturer or authorized distributors?
All SMF150AT1G 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 SMF150AT1G meets industry standards.
7.What is the process for return or replacement of SMF150AT1G?
All SMF150AT1G units undergo pre-shipment inspection (PSI). If there is an issue with SMF150AT1G, 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 SMF150AT1G part is unused and in its original packaging.
Return procedure for SMF150AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF150AT1G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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