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onsemi SMF15AT1
- Part No.:
- SMF15AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SOD-123F
- Datasheet:
-
SMF15AT1.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SOD123FL
- Quantity:
- Payment:
- Shipping:
Inventory:8,984
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Product details
Overview
SMF15AT1 from onsemi is a unidirectional transient voltage suppressor (TVS) diode designed for overvoltage protection of sensitive electronics. It features a 15 V working peak reverse voltage (VRWM), 24.4 A maximum peak pulse current (IPP), and clamps transients to ≤24.4 V at that current. Its SOD−123FL package enables compact integration in power rails and I/O lines of portable and industrial equipment.
For engineers reviewing the SMF15AT1 datasheet, pinout, applications, or equivalent options, this device is selected for DC power line surge immunity per IEC61000−4−4 (40 A), ESD robustness (>16 kV HBM), and fast sub-nanosecond response in space-constrained designs.
Technical Context
The SMF15AT1 operates as a Zener-based unidirectional TVS, conducting only during reverse overvoltage events above its breakdown threshold (16.7–18.5 V at 1 mA). Its low zener impedance ensures stable clamping under high-energy 10/1000 µs surges up to 200 W peak power.
Thermal design relies on the SOD−123FL package's 325 °C/W junction-to-ambient thermal resistance with recommended PCB pad layout. It meets MSL 1 reflow requirements and supports 260 °C peak soldering for 10 seconds without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 15 V - sets minimum operating voltage threshold before clamping activates |
| Breakdown Voltage (VBR) @ IT = 1 mA | 16.7–18.5 V - defines precise conduction onset under controlled test conditions |
| Clamping Voltage (VC) @ IPP = 24.4 A | 24.4 V max - limits downstream voltage stress during worst-case 10/1000 µs surge |
| Peak Pulse Power (Ppk) @ 10/1000 µs | 200 W - sustains single high-energy transients without failure |
| ESD Rating (HBM) | >16 kV - protects against human-body model electrostatic discharge events |
| Response Time | <1 ns - reacts faster than most ICs can be damaged by voltage spikes |
| Leakage Current @ VRWM | 1 µA max - negligible standby power loss in always-on circuits |
Pinout & Package
SOD−123FL surface-mount plastic package: 2.5–2.9 mm length, 1.5–1.8 mm width, 1.0 mm max height, cathode indicated by polarity band. Optimized for automated placement and reflow with 8 mm tape/reel (3,000 units).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Protected Line Connection | Connected to the line being safeguarded (e.g., VBUS, signal rail); carries surge current to ground |
| 2 (Anode) | Reference/Ground Return | Tied to system ground or low-impedance return path; completes clamping circuit during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD−123FL footprint | 8.45 mm² area and 1.0 mm max height enable placement in ultra-thin consumer devices |
| IEC61000−4−2 Level 4 compliance | Withstands 15 kV contact / 20 kV air discharge without parameter shift or failure |
| IEC61000−4−4 40 A surge capability | Clamps repetitive 40 A 5/50 ns fast transients on power or data lines |
| Matte tin lead finish | RoHS-compliant, solderable with standard SnPb or lead-free reflow profiles |
| MSL 1 rating | Unlimited floor life; no baking required prior to assembly |
Applications
| USB Power Input Protection | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protects 5 V USB VBUS input from hot-plug inrush, load dump, and nearby ESD events in portable chargers and peripherals. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, acting as last-line voltage clamp before DC-DC converter input. Use Value: Limits transient voltage to ≤24.4 V, preventing damage to 6 V-rated input capacitors and enabling reliable operation across 10,000+ connect/disconnect cycles. |
Use Scenario: Shields 4–20 mA analog sensor outputs in factory automation systems from cable-induced surges and field ESD. IC Role / Device Role / Timing Role: Mounted at connector entry point to shunt induced transients before reaching precision op-amp or ADC front-end. Use Value: Sub-1 ns response ensures clamping occurs before 12-bit ADC sampling window, preserving measurement integrity under 40 A IEC61000−4−4 stress. |
| Automotive Body Control Module (BCM) | Point-of-Load DC-DC Converter Input |
Use Scenario: Safeguards 12 V supply rails in BCMs exposed to ISO 7637-2 pulse 1/2a/3a transients during vehicle ignition and load switching. IC Role / Device Role / Timing Role: Placed directly at fuse box feed-through to absorb energy before it propagates into microcontroller power domains. Use Value: 200 W peak power rating handles 100 V/50 ms load dump pulses without thermal runaway, maintaining system uptime. |
Use Scenario: Protects buck converter IC inputs in telecom power supplies from AC line surges coupled through primary-side isolation. IC Role / Device Role / Timing Role: Positioned between bulk capacitor and controller IC to clamp overshoot caused by transformer leakage inductance ringing. Use Value: 1 µA max leakage avoids efficiency loss at light loads; 24.4 V clamping prevents controller UVLO false triggering during 10/1000 µs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same VRWM (15 V) and VC (24.4 V), but SMA package (larger footprint, higher RθJA = 40°C/W) | Less suitable for ultra-thin mobile PCBs due to 2.2 mm height vs. SMF15AT1's 1.0 mm | Select SMAJ15A only when higher thermal mass is needed for repeated surge duty cycles |
| P6SMB15A | Higher Ppk (600 W), DO-214AA package, VRWM = 15 V, VC = 24.4 V, but 3.5 mm height and 4.5 mm width | Used where board space allows larger footprints and higher surge margin is prioritized over size | Choose P6SMB15A for industrial power supplies requiring >200 W single-pulse headroom |
Compared with SMAJ15A and P6SMB15A, the SMF15AT1 delivers identical electrical protection performance in a 60% smaller footprint and 55% lower profile-critical for modern portable and automotive ECUs where PCB real estate and Z-height are constrained.
Availability
SMF15AT1 is available at Aetrix Electronics and suitable for USB power delivery, industrial sensor interfaces, automotive body control modules, and point-of-load DC-DC converters requiring stable component supply across high-volume production cycles.
Supply support for SMF15AT1 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SMF15AT1 belongs to the SMF5.0AT1 Series of unidirectional TVS diodes engineered for compact, high-reliability overvoltage protection in space-limited applications such as smartphones, wearables, and automotive ECUs.
FAQ
What is the clamping voltage of SMF15AT1 at its rated peak pulse current?
The SMF15AT1 has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current (IPP) of 24.4 A under the 10/1000 µs waveform. This value is guaranteed across temperature and ensures downstream components see no more than 24.4 V during surge events. The SMF15AT1 maintains this clamping performance with low dynamic impedance, critical for protecting 24 V-tolerant interface ICs.
Can SMF15AT1 be used for bidirectional transient suppression?
No, the SMF15AT1 is a unidirectional TVS diode and conducts only in reverse bias above its breakdown voltage. It does not suppress positive-going transients on grounded lines. For bidirectional protection, a pair of SMF15AT1 devices in series opposition or a dedicated bidirectional part like SMBJ15CA is required. The SMF15AT1 datasheet explicitly specifies "Uni-Directional TVS" in its marking diagram and electrical characterization.
What is the maximum operating temperature range for SMF15AT1?
The SMF15AT1 is rated for an operating and storage temperature range of −55 °C to +150 °C. Its junction-to-ambient thermal resistance (RθJA = 325 °C/W) assumes use of the recommended SOD−123FL footprint on FR-4 PCB. At 150 °C ambient, derating reduces its steady-state power dissipation to zero, but transient surge capability remains intact per Figure 4 in the official onsemi datasheet for SMF15AT1.
How does SMF15AT1 compare to standard Zener diodes for surge protection?
Unlike general-purpose Zener diodes, the SMF15AT1 is optimized for transient suppression: it offers 200 W peak pulse power (vs. typically <1 W for Zeners), sub-1 ns response time, and guaranteed clamping voltage under standardized 10/1000 µs surges. Standard Zeners lack surge-rated construction and degrade rapidly under repetitive transients. The SMF15AT1 also features tighter VBR tolerance (16.7–18.5 V) and lower leakage (<1 µA), making it suitable for always-on protection circuits where power budget is constrained.
Is SMF15AT1 compatible with lead-free reflow soldering processes?
Yes, the SMF15AT1 uses 100% matte tin (Sn) lead finish and is qualified for lead-free reflow with a maximum peak temperature of 260 °C for up to 10 seconds. It meets MSL 1 requirements, meaning it can be stored indefinitely at ambient conditions without moisture sensitivity concerns. The device's thermosetting plastic case complies with UL94 VO flammability rating, ensuring reliability under standard J-STD-020-compliant reflow profiles used for SMF15AT1 assembly.
SMF15AT1 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- 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
SMF15AT1 FAQ
1.How can I place an order for SMF15AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF15AT1 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 SMF15AT1 reliable?
The price and inventory of SMF15AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF15AT1 is usually 5 days.
3.What payment methods are accepted for SMF15AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF15AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF15AT1?
SMF15AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF15AT1 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 SMF15AT1?
For technical support, including SMF15AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF15AT1 requirements.
6.How does Aetrix verify that SMF15AT1 is sourced from the original manufacturer or authorized distributors?
All SMF15AT1 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 SMF15AT1 meets industry standards.
7.What is the process for return or replacement of SMF15AT1?
All SMF15AT1 units undergo pre-shipment inspection (PSI). If there is an issue with SMF15AT1, 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 SMF15AT1 part is unused and in its original packaging.
Return procedure for SMF15AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF15AT1 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
-
D5V0L1B2WS-7
Diodes Incorporated
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